MOS Diaphragm Wall

2 Construction Methodl Bi~n phap thi cong

2.1 General! Gi&j thi~u chung In general, cast-in-site underground diaphragm walls are constructed primarily through the following procedures:

Excavating (including verticality inspection, joint treatment) Installation of rebar cages Concrete placing

Nhin chung, cong tac thi cong tU'&ng vay c1u'Q'c tien hanh theo cac cong aor;Jn chlnh sau:

Dao (bao gam kjem tra a¢ thang aung. XLl'ly mol noi)

Lap cl(Jt long thep

£)0 be tong

Long-bucket Grab will be adopted for excavations of diaphragm walls in this project. Tung-Feng will use self-made heavy grab and a 50-70T crawler crane for the grab. The joint of partition plate can be clean thoroughly to prevent water seepage. The horizontal bars of primary panels are embedded almost 60-80cm into secondary panels and the rebar cages of primary panels and secondary panels are lapped to ensure the joint rigid.

PhuD'ng phap gaLl ngo?m Icas cJL.fQ'c dCJng cho cong tac clao tu&ng vay Tung Feng se dCJng gaLl ngo~m tl/ cai tifm va mot c§u banh xich 101;1; 50-70T MtIu no; cLia t~m vach ngan auqc lam S;;lch ae ngan ch(Jn th~m nu'6c. Cac thanh n~m ngang cua cac long am cluQ'C aUla VaG mot khoang 60-80cm VaG trang cac long dU'O'ng va 16ng thep cDa CaG panel du'Ong va panel am aLfQ'C noi ch6ng ae clam bao cl¢ cCmg ciia mo; noi.

In this diaphragm walls use ICOS method to construct retaining wall using bucket grabs.

Trang cong tac thi cong turmg vay cDa d~F an nay, Nha thEw Tung Feng dung phuung phap ICOS, ae thi cong tu&ng ch~n bfmg gall ngo?m.

2.2 Partition Plate Overlapping Joint Method I PhU'O'ng phap cfau no; tam ch~n

There are many methods for joint treatment of diaphragm walls. For example, Interlocking Pipe method, Water Stop method, Partition Plate method, etc. However, the main purpose of these methods is to avoid water and soil going into excavation area. From experience, panel joint area is a major problem that can cause excavation retaining to collapse.

Method Statement for Diaphragm Wall Construction Revision: A

President's Place Project Page: 3

To prevent the disaster, a good method of stopping water from seeping through the joints is necessary.

Co nhiEJU phu'O'ng philp xu Iy mEW noi cho tuang vay. Vi dl) nhU' phuong phap n6i COC, phuong phap Nk ong nu'6'c; phuong phap noi tam chi;Jn ... Tuy nhien, ml)C (fich chinh cua cac phu'ong phap nay la ngan mr&c va oat vao trang khu Vi!C aao. thea kinh nghi~m, Vung lien ket giCfa cac panella 1 van cfe quan frong ma no co th4 gay ra svp f{5' thanh aao. D~ 017 phong hi~m hoa nay, mOt 1 phuong phap t ngan chi;m nLF6'c r6 (i oi qua m6i no; (hay vung lien ket) la van 017 c.§n thiet.

Partition Plate Overlapping Joint will be used for the diaphragm wall construction in this project. According to construction sequence and rebar cage shape, there are three types of panels: 1. primary panel (female); 2. Secondary panel (male); 3. Possessive panel (hybrid).

Phuong phap (Jau /1oi tam chi'jf7 se au'Q'c s{r dl)ng thi cong tu'&ng vay cho dl!' an nay Thea trinh tl)' thi cong va hinh df)ng cL/a long thepJ co 3 df)ng 16ng: 1. panel am; 2. panel duong, 3. panel trung tinh (hon hop).

Generally, the excavation starts with a primary panel which consists a 2 + 1 cutting pattern. The pattern usually starts at one end of the panel, over excavating the panel's segment; then moves on to the other end, also over excavating; finally, finished the middle wedge cut. Usually two primary panels would be installed first then the secondary panel would be slotted in the middle. As for the secondary panel, the cutting pattern is in 1 + 2 formation. Since both sides of the secondary panel already has been excavated from the primary panel's cut, it will start in the middle, thus creating two wedges, and then finish the excavation of the panel by grabbing the last two wedges. Further, the cutting pattern of a possessive panel is usually adopted with 1 + 1 formation to extend a finished panel.

M¢l cach tong quat, cong lac cIao bat Gau v&i panel am GaLl lien ThU'o-ng 2 panel am se c1U'O'C lap oi'jt tru'o'c sau (fo panel duo'ng lap vao giCra 2 panel am. each aao panel dl.fO'ng: vi 2 mi'jt clla panel du'Ong aa oU'Q'c aao tu' 2 panel am nam Ian c(ln, nen panel dLJ'ong se bat oau Gao 0' gi{J'a cLia panel nay.

Baa l~n 1 Baa l~n 2

I~ ·1 I~ ·1 _P::l_n_e_l_Ch_f01l_g 9:! em .? PHn"! ommp

Baa l~n 3

The rebar cages of a primary panel will be installed with partition plates on both sides in the longitudinal direction. The horizontal bars of these will be threaded through the partition plates to overlap the rebar cages of secondary panels. For a secondary panel, the horizontal bars of rebar cages will be shrunk and there are no partition plates. Besides, rebar

Method Statement for Diaphragm Wall Construction

President's Place Project

Revision: A

Page: 4

cages of a processive panel include different joint patterns. The joint diagram is shown as follows:

L6ng thep cua nhCrng panel am se cfU'Q'C lap cfi;3t v6'i vach ngan tren Cel hai phfa thea chieu dQc. Nh(mg thanh ngang se cfuQ'C lap vaa xuyen qua cac vach ngan nay cTe g6i len long thep cua panel dLfang £J6i vai panel duong, nhfmg thanh ngang cua 16ng thep se bi co nit 19i va kh6ng co tam vach. Ngoai ra, long thep cua panel trung tinh baa g6m nhieu kieu lien ket. SO' 66 cua lien kef cfU'Q'C the hi~n nhU' sau:

[.o:;:r,::Jvc'i(''! i::c(:"'~;dl!;

\Ao'r 8a" .... ;2020'

'IiI:Q~ Prtmary Panel

--f"-T-'oo"O-'\,:.(l R~I J<OW'"(;'~/"- -'.

j " \

Seoondary Pacel

Eo:r~~ 'S de~od'Str..:e.:

; f ~~=~F=fi±4~F=F=~=~~: ~

f>!z':dt:n±~~==-~=1:::=~:±::::!:::±:::!~~=!=rt:::':::.-=~~~1!::z:r.~~' dM

200 1000 600 400

o o

o C)

li)CO ('Jl "7 0

o ill

=rrJ. t

Jc'n De:oil



Bar

End Plate Stop H16@300Horizontal 8a

2 Bxl.25'@200

I.e; I v

Textile

I L-40x20x3 @200 ~~~(OUTSIDE) I

O.35mm PE

Re . Ora ing 2

Partition Plate Detail

The advantages of the joints are: 1> Joints with partition plates can be cleaned thoroughly to prevent water seepage. 2. The horizontal bars of primary panels are embedded almost 50-80cm into secondary panels and the rebar cages of primary panels and secondary panels are lapped to ensure the joint rigidities.

U'u (fIem cua nhCmg lien kef nay la:

- Lien k~t v6'i tam v8ch co the lam sqch de dang oe tranh SV' tham nu·O'c.

- Thanh ngang clla long am aUlfIC oua vao long duung m¢t khoang 60-80 em va long thep cua long am va long dU'O'f1g oU-C;YC long vao nhau ae aam bao of;> c(mg cua lien kef



Comparison between Water Stop Joint and Partition Plate Over-lapping Joint

So sanh gifra PhU'O'ng phap m6i n6i ch6ng th~m va phU'O'ng phap

m~u n6i t~m chan Water Stop Joint

Description Partition Plate Over-lapping Joint (e.g. CWS Method)

Mo ta Mllu ndi ttJm chi;JnMEW ndi chdnq thllm

Rebar of Joint Area The rebar can not extend for The rebar can extend for overlap overlap between two panel units. between two panel units; this

fJocjJn ndi 16ng tMp and the connecting strength for the improves connecting strength of diaphragm wall is poor. diaphragm wall.

TMp khOng th~ keo dai ot; noi TMp co th~ keo dai o~ noi ch6ng ch6ng qua 2 16ng va ti~p SLfC cho giCfa 2 16ng, cai thifjn vifjc ti~p SLfC tlf&ng vay b; y~u. cho tLf&nq va v:

Before Concrete Can not clean the joint face of .. Using the Box Scrub and Steel Sheet Placing of Water Stop, because the water stop Scrub to clean the joint face of the Secondary Panel material may be Damaged orFalled End Panel. (Male Panel) Off. $u di,mg h<')p rua hof;ic tllm s~t lam o~

Twoc khi 06 be tong lam s<;Jch b§ mf;it cua mau noi tEJm cho 16ng dlfong

Khong thE§ lam s<;Jch b<§ mf;it cua mdi chf;in panel.

chOng thtlm co thE§ bj My hO<;Ji ho~c b; pM My

ndi ch6ng thllm, vi nguyen vfit li~u

Partition Plate fabricated along with steel bar which is time consuming.

Working Efficiency Water Stop installed with Stop-end rebar cage so as to save working

Hifju qua kinh t~ time.

Ch6ng thllm OlfQ'C Illp of;it thanh s~t chf;in cudi Tam chf;in o~t doc 16ng thep o~ ti~t

ki~m th&i gian Partition Plate has enough stiffness

and fixed the shape is difficult. Stiffness The Water Stop is a rubber band,

This is difficult to be out of shape. fJO b§n Mllu ndi chdng thtJm la m<')t day T;§m chf;in co ou 00 b<§n, rllt kh6 bi~n

thun va t<;JO ra hinh d<;Jng vLfa kh&p d<;Jng thi r;§t kh6

No follow-up work after concrete (Female Panel) After Primary Panel Need to pullout the Stop-end steel

placing Concrete Placing of

bar after 24 hours of concrete placing. When pull out the

KhOng co cong vi~c nao kem thea Follow-Up Work Stop-end caisson beam, it is apt to

sau khi 06 be tong.cause the Water Stop to come off or

Sau panel oEw tien damaged

(panel16ng am) thea doi cong tac 06 be C~n keo t;§m tMp chi;Jn cudi sau tong 24h 06 be tong. Khi keo d~m ketxon

chf;in cUdi, no co th~ la nguyen nhBn gay mtJu noi ch6ng thllm b; hOnq If the diaphragm wall is deeper, the Partition Plate fixed with rebar cage, risk is very high when removing

Risk of Connection cast in to diaphragm wall without

Rui ro k~t ndi removal after construction, there is no

sheer key and water stop, the risk caisson beam, if partially install

risk



Comparison between Water Stop Joint and Partition Plate Over-lapping Joint

So sanh gifi'a PhU'O'ng phap m6i n6i ch6ng th~m va phU'O'ng phap

m~u n6i t~m chan

Description M6 ta

Water Stop Joint (eg. CWS Method) M~u n6i ch6ng tMm

Partition Plate Over-lapping Joint M~u n6i t~m chfJn

of pipe-leaking is higher

N~u tuang vay sau han, rui ra r~t cao khi dai dtlm kaixon , ntw ltip d~t sheer key va ch6ng th~m, rui ra cua r6 r7 cao.

T~m chiln c6 djnh trang Idng tMp, dfJt vao tuang vay khOng thEw ra sau khi xay dl,mg, khOng c6 rui ra

While Coming Off or Damaged

Khi bj hOng ho?c thi~t h?i

It is difficult to repair

R§t kh6 sua chua

Partition Plate is fixed by welding on the rebar cage of primary panel (female panel) and is not easy to come off or damage.

T§m chiln duQ'c han c6 dinh trang Idng tMp cua Idng am va khO bj hu hay thi~t h?i.

Structure Non-structure connection, sheering Structure connection by rebar cage Consideration force transferred to pure concrete overlap, RC system to take shear

Xem xet k~t c§u sheering key which cannot take bending moment. Lien k~t khOng chju Il!c , Il!c dt , truy~n qua be tong I/!C cM chfnh khOng di cung vai moment chju u6n.

force and bending moment, control un-uniform deformation

Lien k~t k~t c~u do Idng tMp n6i cMng len nhau, M th6ng RC c6 Il!c cilt va u6n cong, ditJu chlnh Sl! bi~n d?nq kMnq dtJu.

Cost The construction cost of DW is The construction cost of DW is higher

Chi phi lower.

Chi phi xay dl!ng tuang vay th~p

However, the repairing and risk cost for excavation is lower

han. Chi phi xay dl,mg tuang vay cao. Tuy nhien, vi~c sua chua va chi phi rui ra cho cong tac dao thtJp.

Note: Risk Avoidance, do whatever Necessary before Damage Happen, Control the Quality of the Work to Prevent Un-know Risk.

Ghi chu: Tranh nli TO, lam bat eLf diEm gi e~n thi&t tnrac khi thi(§! h:;Ji xay ra, ki~m soM chat 1U'()'ng ngan ch$in vi{k kh6ng bi&t nli TO xay ra.



2.3 Work Flow Chart! Trinh tt)' thi cong

The work flow-chart is shown below.

Trinh tl)} thi cong

r--_._._._._"

No Material Test an Check

Concrete Placing

Verticality No Inspection

Guild Walls, Pavement and Ponds

Machine Preparation, Rebar Gage Yard

Site Clearing, Grading, Surveying and Layou

Yes

Rebar Cage Check

Return



r-'-'-'-'-'-'-'-'~

I Son dQn mill b~nn2 Ihi cong

Khao S~I va tric d,lC

TUtlng dan, Duang tl1i cong1

va fib dung djch

Khong

Tr3I~j

\'iit Ji~u

Xilc dinh uQ 6n u!nh ella dung Jit.:h

KiC11l tra dung dich (II Irt,mg. (II) pH.

do llh<1l1

Dua v;it 1i~1I

cong tfU<"mg

1 Tlll'r nguyen v5t h¢u d

Uia cong Ic3ng: thep

Kitlll tra l6ng thep

Co

(hliAn hi may mue. Gia cong long thep

XLr I)' bun [ilils

Ki~m Ira bun I~n" va d6 ,auCo

th~p VilO

Chuy€n may <lao d€n vi lri xac dinh

Ki2m Ira dO sau lhi21 k~ (1:)0 chi~1I sail dao)

Khong d(ll

kiEIll tra

1 C,i

Th;mh chl~ng va xir Ii bun day coc

1 Khong

Ki€mlra dO lh~ng dung



3 Site Preparationl Cong tac chuan bi

3.1 Generall Gi&i thi~u chung Before the construction work, there are some preliminary tasks shall be done:

Site clearing and grading Surveying and layout Pavement and sediment ponds Guide walls

TfU'6'c khi thi eong, elm tief} hanh mot vai eong tae ehuan bi sau:

San don m(It bang thi cong

Khao sat va trae ofie

DU1Yng thi cong va hd dung djch

Toong dan

3.2 Site Clearing and Grading San d9nm~t bang thi cong

(a) Before constructing, the removal of obstacles, on the ground surface and underground, shall be completed.

Tru'&c khi thi congo phai fam xong Gong vi(}G v~ sinh be mat. eDng nhu' duoi m?t oat, mol trer ng<;li Gho thi eong phili au'Q'C fO<;li bo.

(b) The site should be graded for the construction of access road and pavement. If necessary, the low-lying area should be backfilled. It is very important for site drainage, machine positioning, and verticality control of excavation. The distribution of heavy equipment should be located evenly around the work area to avoid excessive loads or unbalanced loads.

Cong tru'ong thi eong phai oUY;YG san bang mot cach tu'O'ng oai oe thi cong ou&ng dan vao cong truu'ng va ouong thi cong. Neu can thief. Duong thap se OI.YQ'c san lap OfJ dam bao mot cao 00. Vi~c nay dt quan trong cho van oe fhoat IlI.YO'e 6' Gong frl.Yong, vi trf o(It ma~ va ki~m soat 00 thang oCmg khi dao. S~I' phan bo may moc thiet bj 16'/1 nen aU'Q'e ajnh vi deu nhau xung quanh khu vvc lam vi~c o€J tranh qua Miho?ckhongcanban~

(c) The construction site should be fenced to maintain the security of the site and the safety of personnel.

Cong truo't7g thi cong nen co hang rao de dam bao an ninh cong



Revision: A

Page: 11

Iru6ng va an toan cho nhan vien.

3.3 Surveying and Layout I Trac c1~c va m~t bang thi cong

(a) According to the pre-condition survey report and the results of Cadastral survey confirming the site boundary, the control points and benchmarks for this project shall have been installed on a permanent, unmovable object before piling construction.

Thea kef qua baa cao khao sat dja ch~t va dia chinh chi ra ranh gi&i cua cong tru'ang, nhOng di§m kiem soat va moc djnh vj oU'Q'C lap Cff-it tren v<;it thl: co 6inh tnroc khi thi cong CQC.

(b) The coordinate of diaphragm wall corner will be shown with the CAD files according to the Drawings for construction of guild walls.

TOi? at) eLla goc Tuong Vay se OlR;YC the hicn trang ban VB CAD thea nhung bim VB xay dl,mg tu-ang dan.

(c) These corner points will be surveyed by the "Electronic Total Station" with coordinate method and marked by a steel rod (nail) or a stake.

NhCmg dh3m goc phai du'O'c khao sat bai may toan O$C bang phu'O'Ilg P~BP tQa 09 va c]u'O'e aanh dau bai mof que sitt (cJinh) ho?c m¢t cay go.

(d) The offset markings shall be set at least in two perpendicular directions. The relationship between the corner points and the offset markings shall be recorded for tracking back in case loss of control points or bore centre

Cac khoang do so vai tQa dO goe se c]u'()C thiet I?p v&i it nhaf hai oiem theohai phu-ang vuong goc va ghi chep If;li m6i lien h~ giD'a diem goc va cac khoang 60. Trang tru6ng hQ'p c1iem kiem soat ho?c lam CQC bj mal, co the de dang truy It;1i nh& mo; quan h? giCFa cJiem goc va cJiem dl!' phong. .

3.4 Pavement and Pondsl f)(J'cyng thi cong va ho dung djch

(a) The pavement of access road and work area shall be built for tractor-trailer, truck and crawler crane operation. The pavement can be 20-25cm thick reinforcement concrete (RC) in order to share the loading of these heavy equipments and to reduce the risk of collapse during the excavating work. The rebar cage fabrication yard can be 1Oem thick pure concrete (PC).



Revision: A

Page: 12

fJLI'&ng thi cong va khu VI,J'C lam vi?c S8 elU'Q'C xay dI,J17 g phl)c VI) cho xe tai, xe keo cTc1y. caLi banh xich. fJLfong thi cong co th~ day 20-25 cm oe chia bot tai trong cLia nhCmg thiet bj n?ng va lam giam nguy cO' s<tJp vach trang su6t qua trinh cTao. Bai gia cong long lhep belong day 10 cm.

(b) The water/soil ponds will also be installed for storing stabilizing fluid and excavated soil of construction. Depending on the dimension of the site, there may be a set or multiple sets of water/soil ponds planed and constructed.

Ho chua nu'(yclcTfJt cOng se au'Q'c I~p d?t ae chua fuqng dung dich on djnh va dAt thai trong qua trinh thi cong. TL)y thea di?n tich cua tung cong truong, co thJ co m¢t ho ho?c nhieu ho elLK)'C len k{; hOf;1ch va xaydt,mg.

3.5 Construction of Guide Walls Thi cong tU'iYng dan

(a) Before the excavation of diaphragm wall, guide walls will be constructed at ground level for the following purposes:

Twoc khi dao tuang vay S8 xay dr,mg fU'cmg d~n t~i cao a¢ m?t afJt cho nhCmg ml)C arch sau:

Guiding the excavating tools at ground level.

OEm huang cho cong c/) oao t~i cao GO m?t d~t Supporting the top of excavating trench.

La diem tll'a cho c1i"nh cua mu'Ong ranh aao Allowing reliable reference mark for panels.

La difJm tham chieu Gang tin c~y cho panel. Monitoring the verticality of the excavation during trenching with cable operated grabs (as a supplementary witness).

Kiem tra ao thang aLmg trang suat qua trinh dEw ranh khi eTao bfJng day cap g~u ngo?m (nhU' au&ng thang dai chieu bo sung). Providing support for rebar cages, tremie pipes, etc.

La aiem t(.fa cho long thep, ong aa be tOng ...

(b) These guide walls will be shallow reinforced concrete, built in an open trench. Typical guide walls will be connected with pavement and shown as following drawing:

NhCmg tLf6:ng dan nay S8 du'C)'c vet phan be-tOng eTa elur;yc aa VaG hao dan. Tuong dan men hinh se oU:Q'c no; v6'i Guong thi cong nhu' hinh ve ben dLf6'i:



Revision: A

Page: 13

650

WOOD SUPP RT

012@ 200,CROSS,TYP

20MPA CONCRETE

GL-2,950

o o <Xl

~ SECTION C- C

1000 1000 1000 1000

"'" "'" ~

" ~

WOOO:PPORT~ ,=

"'"

\mo "'" ~ ~ ~

~'»'»>~~'»'~,&,~ 0':0.~'»>>>~)0.)Y,\'l~

a a U1

a a <Xl

8 <Xl

SECTION D- D

Method Statement for Diaphragm Wall Construction Revision; A

President's Place Project Page; 14

4 Construction Essentials I NhCPng bLP&c thi cong chinh

4.1 Panel Layout! M~t bang panel

(a) The Panel Layout Drawing shall be planned and submitted to the employer for approval.

Ban ve m?t biJng panel se oUQ'c nQp cho Chu caLi tu' phe duy~t.

(b) Before the construction of the diaphragm walls, the panel segmentation will be marked on guild walls and confirmed.

Trwc khi xay dVng tLr-&ng vay, nhDng phEw panel se auqc oanh dau [rEm tu'ang d§n va oU'Q'c xac nh?n.

4.2 Positioning of Machinery! Djnh vi may moe

(a) The bucket grab is mounted on a crawler crane. When setting up, the crane needs to be stabilized. Thus the crawlers on the crane can be set parallel with the guide wall.

GEnt ngof,imaLfQ'c g811 VaG xe cau banh xich. Khi khat a¢ng, can trvc can phai alfQ'c giO' on c1jnh. Do d6: banh xfch cua can tn,lc c6 the ou'Q'C O?t song song v6'i tu{yng dan.

(b) The base machine and bucket grab will be positioned according to the guide walls and panel marks. The bucket will be hung vertically and the verticality sensor shall be checked.

B~ may va gaLl nfjo?m au'Q'c ajnh vj thea tu'&ng dan va dau cua panel. GaL/ au'O'c treo thang aung va cam bien se kiem tra oQ thang aLmg.

4.3 Excavating! Cdngtac aao (a) The specific gravity, viscosity and pH value of stabilizing fluid shall be

tested and recorded on site before excavating. If unqualified, it shall be adjusted and tested again.

T1 trQng, ao nh61 va 09 pH cua dung djch on cfjnh phai aU'Q'c kiem tra va ghi nhf[Jn tf,ii cong tru'cyng trU'oc khi tien hanh cong tac aao. Trang tnl'&ng hO'P nhO'ng thong so tren kh6ng thoa man nhDng yeu caLI ky thu?t o§ ra, se c1LfQ'C aiEw chinh va kiem tra If,ii cho dim khi aLi aieu ki~n cho phep aEw.

(b) A dump truck (or a temporary dump tank) will be moved aside and get



Revision: A

Page: 15

ready. Both main cable and secondary cable tight will be kept and the bucket shall be opened. The bucket will be lowered to the trench and the bucket will be stopped at the bottom of the trench.

Xe tai ch& oat thai (hOflC be ChUB oat thai t<;lm thai) se c1uqc di chuyen ve m¢t ben va san sang hoC;'tt c1¢ng. Ca dEW cap chinh va day cap phv OLfQ'C gil1' ch(Jt va gall se ouryc rna. GaLl oU'Q'C h<;l xuong cho oen khi ch<;lm oay ranh.

(c) The cables shall be tight slightly to get the bucket straight and then the close button will be pushed to close the bucket. The bucket can completely close at one time in soft ground. In dense or stiff ground, however, the close button should be push to close the bucker only after slightly lift-up of the bucket.

Day cap c1u'Q'C c¢t hai ch~t 06 giG' cho gau treo thang oifng. sau 06 se bam nut d6ng of: g€w 06ng l<;Ii. Gau 110an toim co the 06ng l<;Ii khi a trang a;jt memo Tuy nhien; neu 6' trang ailt o~c hay cCrng. chi nen c10ng gau {<;Ii saLl khi nhac gtw len m¢t khoimg nh6.

(d) The bucket with soil filled will be gently lifted out of the trench. When the bucket is lifted higher than the truck, the base machine mast will be turned to the truck to open the bucket and unload to the truck. And than, the bucket will be returned to the original position to get ready for the next excavation.

Gau chua oay oat se OI.J'Q·c nhflc len kh6i ranh m¢t cach nhf} nhang. Khi gau ouQ'c nhfJ.c len cao han xe tai 00 oat, c(Jt b~ may oU'Q'C quay qua xe tai de ma gtlu va 00 oat vao xe. Sau 00, gaLl se oU'Q'c tra l<;Ii vi trf cO san sang cho 11m oao tiap thea.

(e) After checking and conforming the depth of the excavated trench, the excavating machine will be removed to another pane;1 and start to drill when it is ready.

Sau khi kiflm tra va xac nhfm at) sau cua ranh clEw. may dao se OLfC)'C chllyen ofm phtln khac ctln cIao va bat cIau cIao khi no san sang.



4.4 Joint and Bottom Soil TreatmenU Kh&p no; va xiP /9 bun lang day cC;>C

(a) For construction of a secondary panel, the joints shall be cleaned. To ensure the cleanliness of the partition plates, brushing in pre-excavated portion is necessary. Brushing facility is a steel brush which is welded on a steel box.

Khi thi cong long dLfang, kh6'p n6i phai auqc lam sf;1ch. De dam bao vi~c lam S;;1ch nhOng tam ngfm, can phili quet sc;Jch truvc khi oao. Cong C~J quet la chOf thep oU'qC him vao m¢f h¢p thep

(b) To control the quality of diaphragm wall, before the installation of the rebar cages, the bottom soil of trench shall be cleaned by bucket grab. Occasionally, the cleaning after ultrasonic test done ( If necessary).

De ki{;m soat chat lU'Qng tuong va)!, tnJ'6'c khi IfJp d~t 16ng fhep, crttt & oay cua ranh aao phai oU'Q'c lam sf;1ch bang g{JU ngoCjJtn. Thong thuang, thai glan lam sf;1ch sau khi kiem tfa sieu am hoan tttt (nEw can thf~t).

4.5 Verticality Inspection! Ki~m tra (/9 thang (/{Png

(a) The verticality and wall shape of the completed trench shall be checked by ultra-sonic test to the accuracy of the excavating depth.

D¢ thang cl&ng va hinh d;;mg tLfang cua fanh 68 hoan thanh phai c1uy;>'c killm tra bang phU'O'I7g phap sieu am aam baa cho chieu SaL! aao aLI'Q'c chfnh xac. .

(b) For a primary panel or a processive panel, the ultra-sonic testing machine will be set with the position of the partition plates, and the entire drilled depth will be tested.

f)6i v&i panel am hoi[1c panel trung tfnh, may ki{;m tra sieu am aLI'Q'C IfJp d~t tf;1i vj trf cua tttm vach. loan b¢ chil:w Sail khoan sf; DU'(!C kiem tra.

(c) For a secondary panel, the ultra-sonic testing machine is aligned with the center of the excavated trench, and the entire drilled depth will be tested.

f)6i v6'i nhO'ng panel dU'O'ng, may ki{;m tfa sieLl am du'Q'c oi[1t tren aLf6'ng tam cLia fi3nh oEw, loan b¢ chleu sau khoan sf; OLfQ'C kiem tra.

(d) The excavated trench shall be rectified if the deviation is more than the tolerances.

NeLl sai s6 00 aU'Q'c Ion han dung sal cho phep, ranh oa aao se ouqc sua If;1i cho df;1t yeu cau.



Revision: A

Page: 17

4.6 Fabrication and Installation of Rebar Cagel Gia c6ng va lap c1~t long thep

(a) Each section of the steel rebar cage should be fabricated and assembled according to the approved shop-drawings. To avoid deformations and deflections owing to lifting, the self-weight and the length of the rebar cage, the finished rebar cage will be well supported while placed on the ground and during the installation of the rebar cage.

M6i ph.§n cua long thep aU'(lc gia cong va lap o?t thea ban ve chi ti6t thi congo f)tJ tranh bir§n dr;mg va vong long thep do nang len hOc;lC do (rong luqng ban than cCing nhu do chieu dai cua 16ng thep, long thep sau khi cJLfClC gia cong phai au'Clc C/O' khi C/(Jt tren mc;lt d§t va ca trang giai cJoc,w lap Q?t.

(b) The splice of the rebar cage shall be made by lapping with the approved method (hooks for connecting or welding).

Ch6 nai cua 16ng thep phai C/u'Q'c noi chong len nhau thea phuong phap da our)'cphe dL/y~t (moc hOc;lC hEm).

(c) Mortar blocks will be used as spacers of the 7cm thick cover.

OLing can ke xi-mang day 10cm ae cach long thep va'! ranh.

(d) After completion of all lap splices of the rebar cage, it shall be installed as soon as possible in order to prevent sedimentation and avoid the collapse.

Sau khi hoan tat cac mai no! GLia long thep, lang thep cEm oU'(Yc lap o(Jt cang sam cang t6t C/€J tranh long thep bj dey ho(Jc SeW 1&.

(e) When reached the designed level, the rebar cage shall be suspended from the top of the guild wall by additional hanger bar. The top level of the rebar cage shall be confirmed in comparison with that of the pavement.

Khi long thep OI.f(Yc O?t or§n cao o(J thi6t klJ treo long thep ter phia trenJ

cua tu&ng dan bang thanh treo bo sung. Cao Cf(J phia tren cLla long thep phili oU(Yc XBC nh?n so vai cao cJ(J Gua oU'cmg thi congo

(f) Longitudinal and transversal stiffeners will be welded to the cage to avoid bending and deformation during erection. The connection between rebar cage sections will be performed on top of the trench using welding method. Besides, the co-ordination with the instrumentation subcontractor is very important and shall be much attention to, especially for the monitoring device installed in Diaphragm



Wall element.

Giang dQc va ngang phal OW1C han cIe tranh cho 16ng thap b! vong va bien df;lng trang suot qua trlnh th; cong. Khop no; giCJ'a nhO'ng c1of;ln phai GLI'C;YC quay len fren ranh c1e thufln ti~n han. Ngoal ra, Stl phoi hc;yp gW'a cac thiet bj cua thEW phv cOng rfit quan trQng va clm c1LfQ'C chLJ y. cl<;ic bi~t clo; val cac thiet bj theo dol aU'O'c lap aflt trang tu'&ng vay

(g) A suitable working crawler crane will be used for installing the rebar cage into the panel after completion of ultrasonic test. Removable handling hooks will be used to lift cage sections and to lower them into the trench. Suspension bars are connected using welding technique to the top of the cage. These suspension bars are carefully positioned in order to get the cage at the right level.

May ciw banh xich thich hqp se OLFC)'C sU' dl,JI1g ae lap oflt lang thap vao panel sau khi kit3m tra SieLl am. Moc cam di of)ng ou'Q'c dung ae nang cac ao~m long lem ho?c hf;l CaG (Jo;;m long xuong trang ranh. NhO'ng thanh treoaLrqc noi val aau long thap bang ky thu~t han. NhCmg thanh treo nay duqc c1jnh vi mot cach can th~n ae hU'6'ng long thep vao aung caD dO.

4.7 Installation of Tremie Pipesl Lap a~t ong tremie

(a) Tremie pipes of dia. 8 inch shall be used. The tremie pipes of standard length, such as 1M, 2M and 3M shall be used. Depending on the panel, 2 or 4 sets of tremie pipes per panel will be utilized.

Ong ao b~ tong voi ouimg kinh 8 inch. chleu dai tieu chuan 1m. 2m va 3m clifq'C sU' dl,mg. TLIY thea t&17g panel. 2 hoi;Jc 4 ong tremle se dLlng cho mf)t panel.

(b) The tremie pipes shall be connected and lowered piece by piece until it reaches to the trench bottom. When the tip reaches to the trench bottom, it will be lifted up for 200mm- 300mm in order to keep an enough space to discharge concrete.

Ong aa be t6ng phai auvc noi ttmg ong v61 nhau cho den khi cham day ranh. Khi OaLl ong cham day ranh, ong se (Junc nhac len mot cTof;ln 200mm- 300mm aLl glO' mot khoang can thiet cIe XB betong.

(c) The integrity of the connected tremie pipes shall be inspected during installation. The water tightness and rubber ring ("o-ring") shall be regularly checked after connecting each pipe and the defected o-ring shall be replaced based on the working situation and pipe condition.

Toan b¢ ong 00 be tong OU(JC noi se du'O'c kiem tra trang suot qua trinh lap oat. Vong chf,3n nu'oc va vong cao SL/ au'Q'c k/~m tra thu'cmg XL/yen saLi mol Ian noi them mot o17g. NhDng vong chi;Jn mr&c bi hu' se dU'Q'c



Revision: A

Page: 19

ttJay the fUy thu¢c tCmg tinh huang lam vi?c thl/C te va meu ki?n cua ong.

(d) The length of each tremie pipe and the sequence of installation shall be recorded completely.

Chieu da; ma; ong cT8 be tong va trinh t~1' lap o?t phai cJu'r;JC ghi chep dayou.

4.8 Concrete Placing! £)0 be tong

(a) Polystyrene peanuts and a fitting rubber plug shall be inserted into the tremie pipes to prevent direct contact between the first charge of concrete and stabilizing fluid before placing.

Nhva Polixetiren va nut cao su thich hc;rp se at.fQ'c chen vao trang 6ng trernie cIe ngan ch(m s~1' tiep xuc tn,J'c tj(~p gi(f'a be tong va dung dich on cJinh tru'C)'c khi a6. .

(b) Prior to commencement of the concrete casting work, the workability of concrete shall be checked for prevention of blocking tremie pipes.

Tw6'c khi tien hanh cong tac ouc betong, phai kiem tra kha nang lam vi?c cua belong o~ tranh tinh trC?ng ngh{m 6ng tremie,

(c) Concrete shall be placed in one continuous operation from pile bottom to cut-off lever by the tremie pipes to avoid segregation. The tip of the tremie pipes shall be 1.0M lower than the concrete surface during placing.

Betong phai OU'9'C 00 mot kh6i lien tl)C tel' oay CQC cho dEm cao cT¢ cat CQC oc§ franh tinh fr;;1I1g phan I&p betong. Trang suat qua trinh ao belong luon giCf cho 6ng ao be tong ILion ng(Jp trang belong va cach mcflt thoang be tOng it nhflt 1.0m.

(d) The depth of the poured concrete surface and the tip of tremie pipe shall be recorded completely before and after each mix truck.

Ghi lC?i m¢t cach oay au ao SEW cua be m?t betong va aau 6ng tremie oen cJay CQC trurYc va sau moi xe bel6ng.



5 Site Manpowerl Bo trf nhan /IJ'C

The manpower planning for the test piling work is shown below.

K§ ho~eh nhan II,PC cho cong tac thu' cQc Quac be5 tri nhLf sau:

Title ChCrc VI}

Type Nang II,fC

QualitySo

lU'o'ng

Note Ghi ehLi

Site Manager Quan ('I cong tru&ng

Senior Engineer Ky SU' tham nien

1

Site & Survey Engineer Ky SLf khao sat

Engineer Kysu'

2

Construction Team fJO! thi eonq

Skill Labor Lao aonq lanh nqhi}

8

Rebar Cage Team DOi gia eong long thep

Skill Labor Lao Q¢ng lanh nghfl

12

ICOS Operator Di{}u kh;~n may ICOS

Operator ThQ'may

1

Crane Operator fJieu khien may e~u

Operator ThQ'mav

2

Backhoe Operator D!{;u khien may aao

Operator The; may

2

Others Khac

Common Labor Lao Qong phd thong

2

Site cleaning and environmental

protection V? sinh cong trU'o'l1g va baD vt§ mo; trU'&nq



6 Equipment I Thief bj

6.1 Construction Machine! May moe thi cong The Construction Machine List for DW work is shown below.

Danh sach may moc thi cong t/fang vay nhu' sau:

Item. LOi;li Thi~t bi

Description Cong su~t

Quantity S61U'gng

Excavation Digging Rig(with Crawler Crane 50- 70T) May dEw tU'cYng Vay

T=60-100cm 01set! bo

Crawler Crane C~u banh xfch

60 - 80t 01 set! bo

Excavator May xuc dao

Dump Truck Xe do dat

Generator (Rebar Yard) May phat di~n

PC200 01 set! bO

20 t 01 set! bO

150 KVA 01 set! bo

Generato May phat di$n

100 KVA 01 set! bo

Welding machine May han

Rebar Cutting Machine May cat Rebar Bending Machine May uon cong thep

15 KW 08 sets! bo

01 set! bo

01 set! bo

Water Pump May bO'm nU'<Yc

7.5 HP 02 sets! bo

Tremie Pipe Ong do be tong

8" (2x1 m,2x2m,6x3m) 03 sets! bO

Ultrasonic Monitoring Device Thiet bj sieu am

Koden 01 set! bO



Revision: A

Page: 22

6.2 Water! NU'<Yc

(a) Enough water is needed to maintain the static water pressure and keep the level of fluid from collapsing, so the water resources shall be provided and secured.

CEm duy trl au mm'c ae aam baa ap !t,J'c tlnh va giO' m~fC chat fang tranh S?C fa do V?y nguon nlYac phai cJu'(IC cung cap OL/ va oam baa,

(b) The well pumping the groundwater shall be far apart the excavating area.

Gi€Jng bam cLing cap nU'O'c ngam phai tach rai khu VI)'C oao.

6.3 Power! Di~n

(a) Most of construction machines such as THL machine, crawler cranes, and excavators use the diesel engine power.

HEw htH may thi cong nhlY fa may oao fu'o'l1g vay cau banh xich, va nhung may aaa SLI' dl,mg nhien li?u dau diesel.

(b) The following machines will need electric power supply: Water pump Welding machine .Ultra-sonic tester

Power generators will be prepared to provide these machines with power in site.

NhCmg may sau oay phai dung di¢n:

May bam

May him

May kiem tra sieu am May phat oi~n se au'Q'c chuBn bj cho nhCmg may dLing di~n nay t?; cong truang.



Revision: A

Page: 23

7 Inspections and Records Ngh;~m thu va bao cao

7.1 Times of Inspections! Quy trinh nghi~m thu

During the OW work, the Contractor's engineers will notice the Employer's personnel and inspect the process at following times.

Trang qua trinh thi cong tUDng vay, ky SLJ' cua nha thEw se thong baa 6tm nguoi cua ChLi DEw Ttf va nghi¢Jm thu thea qui trinh sau:

(a) Checking the depth of the trench after the termination of excavating.

Ki~m tra cl¢ sau cLia mLf(Jng sau khi k6t thuc aao

(b) Checking the verticality and profile of the trench by using the ultra-sonic tester after the removal of excavating machine.

Kiem tra 6(> th~ng at:mg va GO nghieng cLia mu'Ong bi!wg si{w am sau khi di doi may khoal1.

(c) Checking the rebar cages before installation.

Kiem ira 16ng thep tmuc khi lap a(lt

(d) Checking the bottom sludge before concrete placing.

Kiem tra bun lang clay CQC trlJ'6:c khi 06 be tong

(e) Checking the level of finished concreting surface after concrete placing.

Sau khi 60 be t6ng, kiem tra cao of) b~ m?t be tong ela hOEm tck

7.2 Records! Sao cao

(a) One set of records of each panel will be supplied to the Employer's personnel on site within two days after concrete placing.

Be t6ng ellS hoan t~t sau 2 ngay gai cho nhan vien Chu Bau Tu' mot bO ghi chep ve panel.

(b) Two signed copies of the completed records will be supplied to the Employer's Engineer within two weeks.

Gc)'i 2 bO ghi chep hoan chinh va aa ky cho nhan vien cLla chi) oau tu' trang v6ng 2 tuan.



(c) The record forms will be provided after discussing.

Bieu m~u ghi chep S8 aU'Q'c cung cap sau buoi thEW /u~m



8 Contingency and Solution Stp co bat ngC>' va giai phap The possible contingency and solution during piling work will be described below. Sf! co b§! ng6' va giai phap co th~ X8Y ra suot qua trinh thi cong coc au'(Yc mieu ta nhl.-I' sau

8.1 Contingency of Drilling Workl S" cO b~t ngO' clia cong tac khoan

(a) Collapse because of excessive loads! S~p do qua tai Potential collapse may occur due to the excessive loads. Before drilling, the equipments that are not necessary should be removed for drilling. Increasing the viscosity of slurry or using depth of guide wall .may reduce the risk of collapse. When large collapse happens, all the '. equipments will be removed and the hole will be backfilled immediately. For several days, the pile could be drilling again after covering the

. around of the borehole with steel plates and Soil improvement Kha nang sijp co th~ xay ra do qua tai. Truoc khi khoan. trang thi~t b; khong can thi~t se di chuy~n. Tang ae) chan cLia vO'a xi 'nang Q{;; SEW

tLr&ng Dan co the giam nguy cO' Sl,lt !LIn. Khi SI,I'" co lim xay fa cao, t§f ca trang thiet b; se di chuyen va ho khoan se aLfQ'c IfJp If;li ngay !~p tue val ngay sau, CQC co the c1uQ'C khoan l;;ii sau khi lap nen cua h6 khoan bEmg thep tam va hOEm thif)n c1§t.

(b) Insufficient water head! Nu'6'c kh6ng au n6ng Insufficient water head in the drilled hole may result in the collapsing of the drilling surface. Spillage leakage into ground may occur while the high permeable layer is encountered. Therefore, the water level within the drilled hole shall be inspected regularly and frequently. Additional slurry or other solutions may be needed to keep slurry from flowing into the high permeable layer. Nu&c kh6ng au n6ng trang ho aa khoan co the la kef qua cua vi(Jc sut !un cua khoan be m~t. Slj'r6 r1 chay fh§m VaG trang !ap alit co the xay ra. Do ao, lop nu'O'c trang ho khoan se aLfQ'C kiem tra thu'&ng XL/yen. Them vii'a ho ho~c gial phap khac co the can ae giLl' ho chay vao trang lop a§t.

(c) Liquefaction! Sl;f bitm loang The distribution of heavy equipment should be located evenly around the piling area to avoid excessive loads or unbalanced loads. Also, liquefaction may occur due to earth tremor or ground shaking caused by heavy equipment According to previous working experience, heavy



Revision: A

Page: 26

equipment should be placed at a good distance away from the borehole location to ensure the safety of equipment and personnel during piling work. S!!' phan bo trang thief bj n~mg S6 cJu'Q'c cJ?t cJeLi sung quanh khu VV'C

khoan de tr{mh qua tai ho?c khong can bang. Ngoai ra, St,.f bien loang co the xay ra do d¢ng eTat ho?c rung l1f3n do trang thiel bj n?ng. Theo kinh nghi?m cua cac dl! an tn..P6'c, trang thiet bj l1i;mg nen d?t 6' khoang cach xa vj trf 10 khoan dam baa an loan cho thiel bj va nhan vien trang qua trinh khoan.

(d) Hindrances in pile position. I Chuang ngai trang ho khoan In some occasions, huge rock or rotten wood may be encountered during drilling. Care and patience should be taken to break or penetrate such objects. To increase working torque or rate may cause ground shaking and damage the drilling surface. Trang m¢t va; trU'6ng hQ'p, can phai c.§n th?n va ki{m nh~n eTe pha va va khoan xuyen qua nhCmg tim eTa Ian hay go m(jc trong qua trinh khoal1. Be tang rna-men ho?c ty I? lam vi?c co the gay rung m(Jt oaf va Jam hong be m(1t khoan

(d Drill bit and pipe dropping! MDi khoan va 6ng lha During the drilling process, it is possible that the drilling bit and pipe snaps and drops suddenly down to the drilled hole. When this accident happens, workers stop drilling and try to hook and drag the dropped bit and pipe immediately with the wire with hook of crane. Trong suot qua lrinh khoan, mOt khoan va ong co the bat ch91 ro'; xL/ong ho khoan. Neu tai n?n nay xay ra, cong nhan se dimg khoan va co gang moc va keo mu; khoan va ong bj rai lim ngay tLfC thi bang day co mac cua can Call.

8.2 Contingency of Successive Work S(J' co kh6ng lucyng trLFOrc

(a) Rebar cage dropping into the drilled hole.! L6ng thep rai xuong ho khoan When the rebar cage drops into the drilled hole, the installation should be stopped immediately. The dropped cage should be recovered by using the wire with hook, which is enough to recover the falling cage. After recovering, the condition of the cage should be check to make sure that the cage quality is still accepted for structural use. Another section will be needed if the cage is not accepted. In order to prevent the cage from falling or dropping, the connecting points among rebars and hanging bars should be carefully inspected. Khi long thep rai xuong ho khoan, vi?c lap long thep can OLl'Q'C dung /;;1i ngay I?p t(rc. Long thep bj rat sf: oU'o'c keo Irm btmg day co moc eTu dai de keo long lhep len. Sau kh; long thep oU'Q'C keo !{m, ket cau cua long thep sf: eTUD'C k;em tra. eTam baa ou tieu chuan chat luang S(f dung,



Revision: A

Page: 27

NtJu long thep khong COl Stf dl,mg dLfC)'c thi can phai co them phfln mai. D~ tranh cho long thep roi, nhOng moi ndi gio-'8 long thep va fhanh freD cfm dupc kitJm tra ky

Tremie pipe dropping into the hole before concrete placing.! Ong d6 be fang raj xuong hd khoan tru'ac khi do belong Care should be taken while inserting tremie pipes into the hole. When the tremie pipe is dropped into the hole before concrete placing, the work should be stopped. A large hook will be used for recovering the dropping pipe from the hole and resume the work. If it is unsuccessful to recover, another sufficient tremie pipes will be inserted to resume the work. Khi lap ong 66 be tong vao h6 can cJn th?n Trang tru6'ng hQ'p ong 60 be tong rai xuong ho truvc khi do belong, cong \/i~c phai oUC)'c ngLfng l<;1i. MQl mac Jon se aLfQ'C s( d{mgc1e k{w ong fa; lif 10 va tiJp t(/C cong vi~c. NfW keo khong thanh c6ng,ong do be tong khac se du'P'c them vao a~ tiep t~/C cong vi?c.

Tremie pipe out of the placed concrete.! Ong 06 be tOng nlJm ngoa; . betong da dO.

If the bottom of tremie pipe be out of the placed concrete due to the pipe blocked, it is a practicable choice to re-penetrate the cleaned tremie pipes into the placed concrete before the initial set of concrete, to vacuum water and slurry in the tremie pipe and to continue placing concrete. The procedure of the treatment shall be recorded completely and accurately. The integrity test of the pile shall be executed after 7 days to confirm the structural capability. NtJu phan duui cua 6ng ao be tong nam ngoai phfln betong aa do do 6ng bi nghen, cach thong dl,mg la xuy{m 1<;1; dng da lam SC;1ch vao belOng aa 06 tru'O'c kh6i 06 dau tien cLia betong, ae lam s<;1ch nLfO'C va ho xi mang trang ong va titJp tl)C 06 bf:dong. Trinh tl,lJ cLia bi~n phap se duQ'c ghi nh?n I?i m¢t cach ally du va chinh X8C. KitJm tra tinh toan v~n cua cpc se au'Q'c thl)tJ hi~n sau 7 ngay de xac nh?n kha nang kef cflU.

(b) Collapse during concrete placing/ Sl)t lun trang qua trinh 60 be tong When placing concrete, there are chances that the wall of hole has collapsed if the water level suddenly decreases. The placing work should be stopped immediately, and draw out concrete and mud by air-lift method. If unsuccessful to clean by air-lift, it is a practicable choice to grab and clean the drilled hole and to insert the rebuilded rebar cage. Khi do be tong, co nguy co' tU'Q:ng bi Sl,lt neu ml) c nU'O'c tang dot ngQt Cong tac do be tong nen ngLmg ngay lap tlfC va lay be tong va bun ra bang phlfO'ng phap th6i rI:Ya. Neu th6i rCra khong thanh congo trong thl,J'c te muc va lam S~ h ho khoan b~mg gau ngo~m va lam l~i long thep.



Revision: A

Page: 28

9 Safety and Environmental Protection An toan va baa Vf# moi trU'c,ng 9.1 General! Tf>ng quan

This section is outlined the methods and controls initiated by the Contractor to ensure a safe, hygeian and productive working environment, for all personnel involved at the worksite.

PhfJn nay gi&l thi~u nhDng y chinh ve phuong phap va Sif qulm Ii thl/c hi?11 bai Nha thfJu oe bao oam an tOE1f1, V? sinh va moi truong lam vi~c hi~u qua cho mQi ngu:&i lien quan tai cong truung.

9.2 Safety Implement Proposal! Trinh tl;l' bao dam

an toan

(a) All personnel shall wear helmet and identification card while entering in the construction site. Only experienced workers work on pile construction.

MQi nguoi lam vi?c t~i cong tru'6"ngoeu pha; o¢i non bao h¢ va oeo the nhan hoi;ic the danh cho khach o~n cong tru'&ng. Chi co nhDng cong nhan lanh nghe m6'i tham gia thi cong c<)c.

(b) No untrained personnel are allowed in the drilling areas.

Nhan vien khong qua huan IUy?f1 se kh6ng ou'Q'c VaG khu vue khoan.

(c) Only trained and necessary workers are allowed to close to the operating cranes or backhoes for security. No personnel are allowed into the heavy equipment working zone and under rebar cage

Chi nhO'l1g cong nhan oa cIu'Q'c huan IUYfm va c~n thiet mai oUO'C tiep c?n khu vY'c ho~t CfQng cua can cau va may cIao. Kh6ng co ngU'o'i nao auq'c phep VaG vung ho?t a¢ng cua may moc thit~t b; n(1I1g va vung ben dLf6'i 16ng thep.

(d) The obstacles of working area shall be cleaned and removed. Access road shall be unblocked and working area shall be tidy.

NhD'I1g chuang ng?i v;JJt trang khu V~'C lam vi?c phai c!u'Q'c lam s?ch va cIa eli. NhCmg tuyen auong dan vaG cong tru&ng se khong bi tat nghen va khu VI)'C lam vi?c phai aUQ'c lam s?ch,

(e) Only licensed and trained operators are allowed to drive or operate cranes.



Chi nhOng cong nhan co bang cap va oUflC t?P hu<!Jn thich hQ'p mai ouqc phep v?n hanh xe can cau.

(f) Cranes shall be installed warning device of rolling over.

NhCmg xe caLi se OLfQ'C gan bang canh baa tranh I?t can caLi

(g) Temporary plastic fences shall be installed around the excavated area and the drilled hole to assure safety. Safety fence shall be installed around sediment ponds. The drilled hole can be covered with steel plates.

Hang rao tC;Jn1 bang nhll'a sf; OLf9'C dV'ng xung quanh khu vv'c oEW va h6 khoan o§ dam baD an toEm. Hang rao an toan cOng sf; OLfQ'C dV'ng quanh h6 dung djch. H6 khoan co th~ oU'Q'c O?y bang thep tam,

(h) Sufficient slurry shall be provided for drilling and checked regularly for suitability. The slurry shall maintain emergency reserve quantity.

Mi)t luqng dLing djch khoan V{Pa au sf; QU'(YC cung cap eho vi?c khoan va ki§m tra thLf&ng xuyen. Ngoai ra con phai d~' trif m¢t !u'Q'ng nhat Cfinh phong cho trU'o'l1g hQ'p khan cap.

(i) The rebar bundle while moving shall be kept from swaying.

NhCmg b6 thep frang khi c1U'Q'c doi c1i phai c1u'C)'c giD' cho khoi lac ILl' qua I?/.

U) The integrity of rebar cages and the lifting equipments shall be checked completely before installation of rebar cages.

Toan b¢ /6ng thep va thief bj nang phai au'qc ki~m tra toan b¢ tru'O'c khi lap Q(tt 16ng thep.

(k) All wire shall be checked before using everyday, and the damaged wire should be changed immediately.

Toaf? b¢ day phai QU'qC ki~m fra tru'oc khi su' d~mg hang ngay va nhCmg day co chat /u'Q'ng kh6ng thoa man yEW caLi Q(tt ra phai dLl'Q'C thay kip thoi

(1) The welding position and tightness of lifting handles shall be checked during installation of rebar cage.

Vi tri hEm va CQC chat C(18 tay nam phai c1u'qc klem tra trang suot qua trinh lap Q(tt /6ng thep.

(m)The work site shall be cleaned up everyday, and the first aid kit shall be prepared in site.

Gong vi?c & cong tru'6'ng phai dU'Q'c dQn dF,;p s?ch se hang ngay va phai c6 dvng c~ sO' cap CULl t?i cong tru'ong.

Revision: AMethod Statement for Diaphragm Wall Construction

Page: 30President's Place Project

(n) The safety billboard and catchphrase could be installed in site.

Bang kh~u hiftu an tOEm co thfJ du'Q'c d/,Yng tren cong truang.

9.3 Environmental Protection! Bao Vf# m6i trU'ang

(a) Clean-up of working areas

Ve sinh khu VI,J'C lam vi(;c

I. At all times, ensure that clean surrounding roads and zones of the site. The cleaned site shall be kept for all time. The surrounding area shall be checked regularly and frequently.

Trong mQi Wc; dam bao v~ sinh nhCmg tuy§n du'Ong lim cc;m va vung phi) c~n cong tnl'CYng. Gong troong cJLfQ'C don s;;Jch vft sinh trong mol IUc. V~ sinh vung phI) c~n phai 6U'Q'c kiem tra thLl'ang xuyen

II. The wheels of disposal trucks shall be cleaned and washed before out of construction site.

Banh xe ciia nhfmg xe 60 6cfJt thai phaf du'Q'c rita s;;Jch truu'c khi ra kh6i cong truong.

III. Trashcans, temporary garbage dumping ground, and waste stocking field shall be set in appropriate area. Garbage and wastes shall be disposed regularly and legally.

Thung rac, ba/do t?m tho'i 6' vj trf phil hOp. Rac thai phai dLFO'C don s;;Jch mot cach thuang XL/yen va hop phap_

IV. Temporary sanitation facilities in site should be cleaned and maintained regularly, and disinfected periodically.

NhDng tii?n tich V? sinh t?m thai & cong trLfang nen OLfO'C lam s?ch va bao tT; thuung xuy{m va cijnh ky_

V Damaged fences will be fixed and repaired immediately.

Hang rao bj hu' h?i pha; cfu'Q'c sLra chu'akjp tho';

(b) Prevention of water pollution

Ngan ngCfa 6 nhiem nUDc

I. Sand screens on manholes shall be installed to keep objects from blocking drains.

Man cat tren 10 c6ng phai dU'Q'c lap cf?t c1fJ giG-' cho c6ng khong bi ngh?fn.



II. Mud in storm drain shall be clean periodically. The storm drain should keep cleaned to prevent mosquito breading and pollution in dead water.

Bun trang eong ranh phai cfLfQ'C dQn Sqch cJjnh ky. Cong ranh can cfLfQ'C giCf Sqch ae ngan ch(m mu6i sinh s6i va 6 nhiem ngu6n mm'c.

III. Sediment ponds on site shall be cleaned periodically.

Ho dung dich & eong tru'cyng phai aLlVc lam Sc;lch ajnh kyo

(c) Prevention of air pollution

Ngan cht;Jn 6 nhiem kh6ng khf

I. Regularly and periodically maintain and check working equipment and vehicles. Operators shall be familiar with maintenance and repair of equipment to prevent discharge of dirty exhaust gas/smoke.

May moe thi6t bj va xe cO' gi&i phai Quqc kiem tra va bao dLfang thurmg xuyen. NgU'CYi v?n hanh may phai thu8n thl,1c trang vi?c bao du-ong va sCra chu'a thief bj, kh6ng de cho thief bj xa khi thai ra ngoai moi tru'ang.

II. Spread water regularly and randomly to avoid dust.

Phun nLfCJc de giam bv/.

iii, Movevehicles or equipment at lower safe speed.

Oi chuyen xe ca gi61, may moc fhiet bj v61 v~m toe an toan.

iv. Keep good ventilation while welding.

Trang khi han, phili thong gio tot.

(d) Prevention of noisy pollution

Ngan cht;Jn 0 nhiem tieng on I. The use of some immobilized equipment, such as air compressors

and generators, should consider their setup locations where noise-affected zone can be reduced to a minimal, or the use of soundproof or quakeproof equipment.

MQt so thief bj kh6ng di chuye1f1 cJuqc nhu' nhLr may nen khi va may phat cfi?n phil; auqc lap cft;Jt (y vj trf thich hop, giam den muc to; thitw ti6ng 617 cho nhu'I1g vLing bi anh huang. NeLl khong phai SLf dl,1ng thief bj chong rung va chong on.

II. Under certain condition and situation, simple soundproof



equipment or tools shall be used to reduce the noise level.

Trang nhiYng m~u ki?n va tinh hu6ng nhat Cfinh, nhCmg thief bi ho~c cong Ct) giilm am fhanh sa OLI'9'C SLIJ dt)ng O~ giilm tieng on.

III. Beside their suitability, the noise and quake of incoming equipment or tools shall be checked before operating. The use of high noise and quake level of equipment and tools is prohibited.

Tat cil thiet bi mEW moc oeu phili oU'9'C kiem tra 00 on va 00 rung trU'6'C khi v(m hanh. NhCmg thief bj v~n hanh vai 00 on va 00 rung cao sa khong oU'Q'c phep s& dl,mg.

IV. Equipment operators practically carry out the education of pollution prevention. Transport trucks, mix trucks, and bulldozers, etc. should avoid running in neutral gear. Turn off the engine and turn down radio while waiting.

Nguo'i v~n hanh thief bj phai nhf)n th(rc oU'9'C t§m quan trQng cua vi?c baa V? moi tru·&ng. Xe tai lan, tai nh6, xe iii dat khong nen v?n hEmh kh6ng tai, Phai t~t o¢ng ca va ra-m-o trang thoi gian chao

v. Surrounding environment, neighborhood, noise level, and traffic restriction should be taken into consideration for the proposal of procedures and schedules and construction processing line.

Moi fnrong xung quanh, dan cu' gim cong frU'6'11g, mLYc o¢ on va h?n che ve m?f gi80 thong can oU'Q'C xet oen frang vi?c c1~ xuat lien eT¢ thi cong,

vi. Working and constructing at night should be avoided if possible.

Neu co the, fn3nh thi cong VaG ban Clem.

VII. The speed of vehicles should be kept under 20 km/hr to reduce the pounding noise and quaking. The cover steel plate should keep horizontal to' avoid quaking noise owing to unbalanced ground.

V?n t6c cua cac phU'O'ng ti?n oi I?i trang cong tnr&ng phai giu' du'&i 20km/gia o~ giam m(rc d9 on va eT¢ rung. TlJm thep phil; c1u'9'c giOJ nam ngang eT~ tranh on do thiet b; vcYJn hanh trfm m;fit oat khong bang phang.

(e) Storage of materials

Cat giu' vf)t lieu

I. Material-stocking fields should be installed in terms of construction proposal. Each material should be stored systemically and safety.



Revision: A

Page: 33

Khu vuc lu'u kho nen auqc dl,.mg thea cTe an xay dl)Jng. Moi 10E;li V?t lii}u phai auo'c sap xep mot cach co hi} thong va an loan.

II. Notice stock height, and avoid blocking working path and roadway.

Cht1 y chieu cao cat giCf v?t lieu. tranh can trcy cToong c1i va 16i lam vii}c.

iii. Tie down materials strongly and firmly before typhoons or storms for safety protection.

GiCf ch~t V?t li(;u trang trU'o'l7g hQp co baa ae dam baa an toan.

9.4 Traffic Controll Quan Iy giao thong

(a) To avoid traffic accidents, traffic controller or security guards shall control entrance.

De tranh tai m;U1 giao thong, nguui qulm Iy giao thong ho?c nhan VifJfl baa v~ phai kiem soat cifa ra vao.

(b) To avoid traffic accidents, heavy construction trucks shall avoid going in and out of site during rush hours.

De tranh lai nE;ln giao thong, nhDng xe tai xay dl,mg n?ng tranh ra vao cong troong vao gi& caodh~m

(c) Construction vehicles must notwaiUpark at the public access road near the work site entrance. All waiting vehicles must park at site in a controlled manner to prevent obstruction or accidents on public roads.

Xe cO' gi&i xay dlcmg kh6ng o?ulQO tE;li nhCfng khu Vp'C Quang vao cong cong gtm cong truvng. Ttll ca nhCmg xe ch& phai cTo trang cong trLf&ng va QU'Q'C kiem soat sao cho trtmh lam chu'6'ng ng?i V?t hoi;Jc tai n~n tren QU'Ol1g cong cOng.



Revision; A

Page: 34

• •

• •

APPENDIX 1

Introduction of SLURRY-MUD 395

P U LUC 1G 01 THIEU

DUNG DICH ON ill H 395



Revision: A

Page: 35

@:® JAMES&ANNIE ENTERPRISE CO" LTD. 7FL, NO. 68, CHIN-HWA 8T SAN-MJNG DISTRICT

KAOHSIUNG TAIWAN R.O.C. TEL:(07)385-7083 FAX:(07)387-9418

SLURRY-MUD 395 Powder Polymer For Drilling Additive

Description: SLURRY-JvIUD 395 is a non-fermenting, concentrated co-polymer designed for fast field mxing. SLURRY-MUD 395 can be lIsed as drilling additive in certain shale and clay formations as well as an additive in drilling mud to increase viscosity and lower f1uid loss.

Recommended IJse: Designed for use in mud rotClry drilling to reduce fluid loss in clay formatlons. The product inhibits hydration of water sensitive shale and clay formations.

Characteristics: • Fast mixing. • Concentrated for high yield . • Becomes more stable over time. • Forms a tight thin filter cake i.n unstable fonnations. • Maintains borehole integrity in both horizontClI and vertical drilled

holes. • Eliminates clay Clnd shale swelling, bit bCllling, and sticking

problems.

Mixing and application: When using SLURRY-lvIUD 395 pretreat mix water with soda ash

so that pH is above 9.0.

Humidity: [0~7.3

Appearance: White granular powder

Packing: 15kg bag, 60bags per pallet. AII pallets are stretch-wrapped.


President's Place Project Page; 36

Nha cung cap CONG TY TNHH JAMES & ANNIE Tang 7, #68 DU'ang Chin-Hwa. Qu?n San-Ming, Kaoshiung, f)ai Loan Tel: (07) 385 - 7083 Fax: (07) 385-9418

M6 ta SLURRY-MUD 395 kh6ng gay xao tr{)n thanh phan h6a hQC cua chat cho vao,thanh ph§n chinh la co-polymer thiet ke oe xuc tac cho qua trinh hoa tr{)n nhanh han. SLURRY-MUD 395 c6 the stY dl)ng nhU' m{)t lo?i phI) gia khoan cho nhCmg lo?i oa set va oat set cCmg nhU' la chat phI) 9ia cho bun khoan oe lam tang o{) nh6't va lam giam vi?c mat nU'ac.

Khuyen cao stY f)U'Q'c thiet ke oe stY dl)ng oe khoan bun xoay tron oe dl)ng giam b6't Sl)' mtd chat long trang oat set. f)(lc tfnh • Hoa tr{)n nhanh

• Nang suat cao • On cJjnh han theo thai gian • Hinh thanh lop IQc mong va chac trang oifw

ki?n kh6ng on cJjnh • Ouy trl Sl)' nguyen v~n cho 10 khoan theo ca

chieu ngang Ian chieu dQc • Lo?! bo Sl)' phc5ng len, o6ng CI)C va dinh cua

oat va oa set

Tr{)n va (mg dl)ng Khi stYdung SLURRY-MUD 395 oe tr{)n nU'&c v&i b{)t . soda nen o{) pH Ian han 9.0

f){)§m 1027.3 Be ngoai B{)t trang f)6ng g6i 15kg/bao, 60bao/ ki?n. Cac ki?n hangoU'Q'c bao kin.



Revision: A

Page: 37

COMPARISON CHART Convention Bentonite Slurry-Mud 395

Physical Appearance

A solid mineral; not soluble; therefore doesn't mix well with water

Totally soluble polymer, mixes well with the water

1800 (Super Mud: water) will cause the viscosity between 32-36 sec depending on the water quality.

Simple mixing procedure; maintain the water pH between 8.5-11.5 with soda ash; no other additive is needed.

Mixing on the spot in the preparation tank; doesn't need 24 hours hydration.

Specific gravity is the same as pure water (specific gravity = 1); and does not increases with viscosity.

Precipitates the cuttings instead of suspending; no settling tank is needed

Works equally well in salt or fresh water

Unlimited time of recycling

Mixing Ratio 5%-8% solid depending on the soil condition

Mixing Procedures

Complicated mixing procedures; other additives, like, dispersion agent, viscosifying agent, and weighting agent, are needed.

Preparation Time

Requires 24 hours advanced mixing; preparation tank is need.

Specific Gravity

Specific gravity increases with viscosity.

Settlement Cuttings suspend in the slurry for a long period of time; setting tank and desending unit are needed

Salt Effect Does not work well in salt water

Recycle After 2-3 times of recycling, the quality is poor

Collection The slurry contains a large amount of sand making collection difficult.

Sand content after 15-30 minutes is less than 2% making collection easy.

Low sand content making the concrete replacement easy without effecting the strength of the concrete

Creates no mud; maintains the cleanliness of the site.

Biodegradable; friendly to the environment

Concrete Replacement

High sand content making the concrete replacement difficult; therefore affects the strength of the concrete.

Effects on Site The slurry is muddy making the site muddy

Effects on Environment

Creates a large amount of unwanted mud that contaminates the environment

Disposing Unwanted mud needs to be treated properly.

The polymer structure can be destructed by strong oxid izer; can be disposed directly on the ground after the treatment.

Cost Inexpensive but consumes excessive shipping and storing costs

Relatively high compared to bentonite but has low shipping, storing and disposing costs



BANG so SANH Bentonite Polvmer

Hinh d~ng ben ngoai Ch;jt khoang rim, khong hoa tan, do cI6 khong the hoa tron tot vai nU'ac.

HOEm toan hoa tan trang nU'ac, hoa tron tot vai nU'ac

Ti I~ hoa tri?n 5% ~ 8% ch;jt r~n tuy thuoc VaG c1ieu ki~n cI;jt

1.800 (Slurry-mud: nU'ac), cIO nh&t 32 - 36 tuy thuoc VaG cIieu ki~n nU'ac.

Ouy trinh hoa tri?n Quy trlnh hoa tron phuc tE;JP; nhCf[7g pht,J gia khac nhU' ch;jt phfm tan, ch;jt tE;Jo cIO nh&t, ch!Jt can bang ty trQng can them vao.

Quy trlnh hoa tron cIan gian; duy trl cIO pH cua nU'ac trang khoang 8. 5 ~

11.5 vai bot soda, khong dn them b;jt cu pht,J gia nao khac.

Th&i gian ehutm bj Can 24 gla twac khl tron, can chuan bj be chua

Tron ngay khl chuan bj be chua, khong can 24 gia cho v;~c hy-rat h6a.

Ti tr9ng Tl trQng tang cung val cI¢ nh&t

Tl trQng cua han hQ'p sau khl tron giong nhU' tJ trQng cua nU'ac tinh khlet (ti trQng bang 1) va khong tang khl cIo nh&t tang

51)' bo tri PhanthualalCfngtrong han hQ'p trang thai glan dal; dn bo tri be chua.

Phan thua ket tua thay vi la ICfng; khong can bo trl be chua

Tae di?ng eua muoi Khong lam vl~c tot trang nU'ac m~n

Lam v;~c tot trang ca nU'6'c m~n va nU'6'c sE;Jch

Tai eh~ Sau 2 ~ 3 Itm SLf dl,mg, ch;jt lU'anq khonq tot

Khong hE;Jn che

51)' hut han h9'P ChualU'Q'ngcatlanlam cho v;~c hut han hQ'p kh6 khan han.

Sau 15 - 30 phut, ham 1U'Q'ng cat nho han 2% nen v;~c hut han hQ'p de danq.

Do betong Ham 1U'Q'ng cat Ian nen vl~c cIo betong g~p nhltm kh6 khan, do cI6 anh hU'ang cIo cung cua betonq.

Ham 1U'Q'ng cat nho nen cIo betong de dang ma khong lam anh hU'ang cIen cIo c(mg cua betong.

Tae di?ng den eong trU'&ng

Bun lam cho cong trU'ang lay 10;.

Khong tE;JO ra bun, glCf cho conq twang luon s<;ich se.

Tae di?ng den moi trU'iYng

T<;io ra mot 1U'Q'ng Ian bun khong monq muon

ThEm thl~n vai mol trU'ang

Thai LU'Q'ng bun khong mong muon can phal c6 bl~n phap XLf Ii thich hQ'p.

c;ju truc h6a hQc cua polymer c6 the tv phfm huy ba; nhan to oxi h6a, c6 the thai twc tlep ra cI;jt sau khi XLf Iv.

Gia thanh Khonq cI~t tien nhU'nq l<;il TU'anq cIoi cao so val



ton kem qua mLPc cho chi bentonite nhLmg chi phi phi v~n chuyen va lU'u v~n chuyen, lU'u kho, va kho. xu 1'1 thai thap han.



TEST OF SLURRY-MUD 395

Item Qualified Criteria (21°C)

Test Method Time of Test

Viscosity 32-50 sec Marsh Funnel &

Cup (946cc/1500cc)

Before Drilling Before Concreting After the Rain

pH Value 8.5-11.5 Test Paper Ditto

Specific Gravity 1.0-1.1 Mud Balance

(May be omitted) Drilling

Sand Content <2% Sand Content Set (May be omitted) Before Concreting

Note: If have the specification by the design we will use it

KIEM TRA SLURRY-MUD 395

Dq nh61

DqpH

Ti trc;mg

Ham 1U'q'ng cat

Di~u kien tieu chu"an

(21°C)

32-50 giay

8.5-11.5

1.0-1.1

<2%

PhllO'ng phap ki~m tra

Kiem tra b~ng pheu & ca dong (946cc/1500cc)

Kiem tra b~ng gi~y quy

Can bang MUD

Kiem tra ham ILI'Q'ng cat

Th6'i gian ki~m tra

TrU'ac khi khoan TrU'O'c khi db be-tong Sau khi tU'ai nude TrU'dc khi khoan TrU'ac khi do be-tong Sau khi tU'6'i nu'cYc

(Co the bo qua) Khikhoan

(Co the bo qua) TrU'dc khi do be-tong

Ghi ehu: Neu co tieu ehuan eua thiet ke , chung tei se SLr dung tieu chuan do.



Revision: A

Page: 41

MARSH FUNNEL & CUP FOR VISCOSITY

KIEM TRA DQ NH6'T SANG PHEU & CA DONG

1. Use a finger or a tool to cover the outlet.

Dung ngon tay hay thief bj o§ bit kin clau ra.

2. Fill the fluid sample (mixed stabilizing fluid) into Marsh funnel up to mark

line 1500 c.c.

Rot clay maLi ch§t long (chat long da dU'Q'c pha tron) vao pheu cho OEm

vE;lch 1500c. c.

3. Remove the cover and discharge the fluid into a 1-quart (946 c.c.) cup.

Use a stopwatch to measure the time. Generally, the viscosity of pure

clean water is approximately 26 seconds.

M& nap ra cho chat /6ng 06 vao ca clang 1-quart (946 c.c) Dung 06ng

ho bam dt'rng oe ao th&i gian. Thong thwYng, a9 nh01 cua nLl'O'c Sc;lch

khoang 26 giay.

4. The time for fluid to fill up the cup shall be the viscosity of stabilizing

fluid. The unit is in Second.

Thai gian cho chat /6ng oong oEW ca fa 00 nh61 cua ch§t /6ng 6n cTjnh

Dan vi fa giay.

5. Density has effect on the measured result. The viscosity measured

using Marsh funnel cannot be compared to results from either

viscometer or Rheometer.

Ti trQng anh huang den k~t qua ao. EX;; nh6't cia ciu'Q'c bEmg ph[w va ca

oong kh6ng thf; so sanh va; ket qua tif cJ6ng h6 do 09 nh61.



Revision: A

Page: 42

MARSH FUNNEL & CUP

PH/~U & CA DONG



Revision: A

Page: 43

MUD BALANCE FOR SPECIFIC GRAVITY

KIEM TRA TI TRQNG

1. Fill up the cup with fluid sample.

£)0 ally ca dong btmg mau chat /6ng lay du'Q'C.

2. Cover the cup and remove the excessive fluid. Clean the cup and place

the balance on the supporting tip. Adjust the balance into leveled

position.

£)~y ca Dong I?i va bo phan chat long dU'thCFB. RLi'B s?ch ca dong va cJ~t

can bang trfJn gia aEi.

3. The reading on the balance is the Specific Gravity of the fluid.

Chi s6 can bang chfnh /a ti tr()ng chat long.

MUD BALA



Revision: A

Page: 44

- -

TEST PAPER for pH Value DiJng giay quy de kiem tra d9 pH

The control of Hydrogen ion concentration in water is very essential for

the effect of stabilizing fluid. In acid water, the super mud can be very

ineffective. Therefore, the water or fluid should be controlled to have a

pH value between 8.5 and 10 before the mix of super mud. The pH is

checked by using pH test paper as shown below.

Vif!c ki6m soat ham IUQ'I1g ion hydra trang mrac rat can thi~t cho hif!u

qua cLla vif!c 6n Ofnh chat long. Trang nu'O'c axit, super mud co the

khong hi~u qua. Do ao, nu&c hay chat long can au'Q'c kiem soat aq pH

trang khoi!mg 8.5 a(Jn 10 tnrO'c khi hoa trqn bun. Gia trf pH d'u'Q'c kiem

tra bang cach dung giay quy nhu hinh ve dU'(Yi aay.

'ADVANTEC

pH Test Paper

Gi;jy quy kiem tra dg pH



SAND CONTENT SET 80 KIEM TRA HAM LU'O'NG CAT. .

1. Pure the fluid sample into tube up to "MudToHere" mark. Add water into

tube up to "WaterToHere" mark. Cover the open and shake the tube.

Mfw chat long tinh khiet dU'(lC bom VaG den v?ch "MudToHere" (bun

aen day). Them nUD'C cho den v?ch "MudToHere 1'• Dong n~p I?i va lac

6ng.

2. Use a 200mesh sieve to filter the fluid. The sand content is checked for

the soil particles retained on the sieve.

Dung ILI'O'i 200 de IQC chat long. Ham IUllng cat QU'Q'c kii3m tra bang

phan tel' Qat con I?i tren Iu&i.

3. Put the soil particles retained on the sieve into the scaled tube with

water. Wait for particles to settle on the bottom of the tube.

£)0 nhOng phan ttf oat con 19i trfm lur)'i VaG ong nghj~m co chia v?ch vai

nuoc. De)'i cho aen khi nhOng phan tLI' nay litng xuong day 6ng nghi~m.

4. The reading on top of the settled soil is the sand content of the sample

fluid.

Chi s6 phia tfen ong nghi~m la ham IU'Q'f1g cat cua mau chat 16ng.



Revision: A

Page: 46

SAND CONTENT SET

Be;> KIEM TRA HAM LU'Q'NG cA T



Revision: A

Page: 47

Documents

MOS Diaphragm Wall