UDC 624 (083.7.5) SABS 1209 LC-19SI

SOUTH AFRICAN BUREAU OF STANDARDS

STANDARD I Z E U SP E C I F 1 CAT I0 N

f o r

C I V I I, ENGINEER1 NG CONS TRU C'L'ION

LC : CABLE DUCTS

Approved by t h e COUNCIL OF THE SOUTH AFRICAN BUREAU OF STANDARDS on 4 November 1981

O b t a i n a b l e from the S A BUREAU OF STANDAKDS P r i v a t e Bag X191 P r e t o r i a 0001 Republ ic of South A f r i c a

Telegrams : Comparator, P r e t o r i a P u b l i s h e d and p r i n t e d i n t h e Republ ic of South A f r i c a by t h e

South A f r i c a n Bureau of S tandards

ISBN 0-626-06042-7 Gr5

5 SABS I200 LC-1981 Cable ducts

SOUTH AFRICAN BUREAU OF STANDARDS

STANDARDIZED SPECIFICATION

for

CIVIL ENGINEERING CONSTRUCTION

LC : CABLE DUCTS

I . 1 . 1

2 . 2 . I

2.2

2.3

2.4

3 . 3. I

3.2 3.2.1

3.2.2

3.3

3.4

4 . 4.1

4.2

SCOPE This specification covers the supply and the laying and bedding in trenches of pipes as ducts for the protection of telephone and electric power cables.

INTEKPRETATIONS SUPPOKTING SPECIFICATIONS. shall, inter alia, form part of the contract document: a) Project specification; b) SABS 1200 A or SABS 1200 AA, as applicable; c) SABS 1200 C, if relevant; d) SABS 1200 D; e) SABS 1200 DB.

APPLICATION. T h i s specification contains clauses that are generally applicable to cable ducts. Interpretations of and variations to this specification are set out in Portion 2 of the project specification which precedes this specification in a contract document.

DEFINITIONS. For the purposes of this specification the definitions given in the applicable of the specifications listed in 2.I(b)-(e) and the following definitions shall apply: Duct. A pipe, generally of diameter up to 150 mm, through which one or more cables are to be laid. Nest (or batch) (of ducts). same trench.

ABBREVIATIONS. specifications listed in 2.I(b)-(e) and the following abbreviations shall apply: ESCOM or ESC : Electricity Supply Commission GPO : Department of Posts and Telecomnunications P I : Plasticity Index

MATERIALS DUCTS. Except that the GPO will supply all pipes for cable ducts required for GPO purposes, the Contractor shall provide all pipes for cable ducts of the type(s) and class(es) specified in the project specification, or scheduled, or shown on the drawings, and pipes provided by the Contractor shall comply with a) SABS 921 in the case of pitch-impregnated fibre pipes (see 5.7); b) SABS 791 in the case of unplasticized polyvinyl chloride pipes; c) SABS 286, SABS 819, or SABS 946, or they shall be of Class T cable conduit pipes, in the case of asbestos cement pipes; and d) SABS 559 in the case of vitrified clay pipes. Joints for ducts shall be rubber jointing sleeves or sleeve-type couplings, as scheduled.

BEDDING Electricity Supply Cable Ducts. selected soil of a granular nature that has a PI not exceeding 6 and that is free from vegetation and from lumps and stones of diameter exceeding 15 mm. Telephone Cable Ducts. a s specified in 3 . 2 . 1 or crusher run graded from 13.2 mm to dust. In addition, in the case of telephone cable ducts of internal diameter greater than 75 mm, the material shall have a compactibility factor not exceeding 0,2.

BACKFILL. Material excavated from a trench may be used as backfill, provided that it contains no rubble or other debris, that it excludes stone of average dimension greater than 150 mn, and that it can be placed without significant voids and be compacted to at least 90 X modified AASHTO maximum density.

CABLE DUCT MARKERS. Temporary and permanent markers for cable ducts shall comply with the relevant requirements of the project specification.

PLANT EXCAVATION EQUIPMENT. requirements in regard to trench width and depth.

TAMPING TOOL. Where more than one duct is to be laid in the same trench, the Contractor shall provide and use a T-shaped tamper consisting of a mild steel rod of diameter approximately 37 mn and of length approximately 300 mn with a metal rod for a handle of diameter approximately 20 nun and of length approximately I 350 mm. or a similar approved tool.

Where this specification is required for a project, the following specifications

- Two or more ducts laid parallel to one another in a regular pattern in the

For the purposes of this specification the abbreviations given in the applicable of the

Material for use in bedding electricity supply cable ducts shall be a

Material for bedding telephone cable ducts shall be selected granular material

Excavations nay be carried out with any plant capable of fulfilling the

SXBS I200 1.C-1981 Cable duc ts

6

5. 5. I 5.1.1 5.1. I . I

5.1.1.2

5 . 1 . 1 . 3

5. I . 1.4

5. I . 2

5.2 5.2.1

5.2.2 5.2.2. I

5.2.2.2

5.2.3

5.2.4

5.3 5.3. I

5.3.2

5.3.3

5.3.4

5.4

CONSTRUCTION EXCAVAIION OF TRENCHES Trench Widths and Depths Subject t o the requirements of 5. I . 1.3 and 5.2.4, trenches f o r duc ts f o r telephone and low-tension (up to 500 V) cables s h a l l be excavated t o widths not l e s s than those shown on Drawing 1.C-I f o r each p a r t i c u l a r duct o r n e s t (ba tch) of duc ts , as appl icable . Subject t o the requirements of 5.1.1.3 and 5.2.4, and unless otherwise shown on the drawings, t renches s h a l l be excavated t o such a depth t h a t , a f t e r the duct o r nes t (batch) of duc t s has been l a i d a s shown on Drawing I,(:-!, there i s a minimum cover t o ground leve l of a t l e a s t a ) 600 nuu f o r telephone se rv ices , b) 900 mm f o r high-tension e l e c t r i c cables , and c ) 600 nun f o r low-tension e l e c t r i c cables . Where trenches a r e t o be excavated across roads and the requirements of t he au tho r i ty respons ib le f o r the roads d i f f e r from those given i n 5. I . 1.2, the dimensions of the trenches s h a l l conform t o the requirements of the sa id au thor i ty . Trenches f o r high-tension (exceeding 500 V) e l e c t r i c cables s h a l l be excavated t o widths and depths not l e s s than those shown on the drawings o r spec i f i ed i n the p ro jec t spec i f i ca t ion . Pro tec t ion of S t ruc tures . tanks, o r o ther s t r u c t u r e s , the Contractor shall take a l l necessary precaut ions required i n terms of the regula t ions framed under t h e Fac tor ies , Machinery and Building Works Act, 1941 (Act 22 of 1 9 4 1 ) , and the Nines and Works Act, 1956 (Act 27 of 1956). including shoring, where necessary, t o ensure the sa fe ty of s t r u c t u r e s t h a t a r e a t r i s k .

BEI)DtNC AN[) COlIPACTION OF BEDDING 'l'rench BotLom. The Contractor s h a l l cons t ruc t the trench bottom in accordance with the re levant requirements of Subclause 5.5 of SABS 1200 DB. bottom and authorized the lay ing of bedding. Bedding Bottom layer . Subject to the provisions of 5.2.4 and except where otherwise required i n terms of the drawings o r the pro jec t spec i f i ca t ion , a layer of thickness 100 mi s h a l l be placed i n the bottom of the trench and well compacted before the duc t ( s ) a r e l a i d . Other layers . Af te r the ducL(s) have been l a i d , t h e surrounding space s h a l l be f i l l e d i n and w e l l compacted (when re levant . by means of t he tamping too l r e fe r r ed t o i n 4.2) u n t i l t he thickness of the bedding layer over the duc t ( s ) is, sub jec t t o the provisions of 5.2.4 and except where otherwise required i n terms of t he drawings o r p ro jec t spec i f i ca t ion , a t l e a s t a ) 150 mm over t he top of duc ts of diameter 75 IMI and less, b) 100 nun over t h e top of duc ts of diameter l a rge r than 75 nnn; and c ) 150 nun over t he top of t he top row of duc ts i n a multi- layer i n s t a l l a t i o n . Bedding around a duct o r a nest of duc t s s h a l l be ca r r i ed out a s laying proceeds. Bedding mater ia l s h a l l be placed around and over the duc t (s ) and thoroughly and evenly compacted, and cornpaction s h a l l be so done t h a t duc ts a r e not d i s turbed o r j o i n t s impaired i n any way. !lult i- layer Pitch-Impregnated F ibre Pipe I n s t a l l a t i o n s . f i b r e pipe i n s t a l l a t i o n s s h a l l be i n accordance with 5.2.2 and, i n add i t ion , t he compacted l aye r s of bedding ma te r i a l between one l aye r of pipes and t h e next s h a l l provide f o r a s epa ra t ion of approximately 75 nun a s shown i n (e ) of Drawing 1.C-I. All bedding ma te r i a l s h a l l be s t a b i l i z e d by the add i t ion of 2 pockets of cement per cubic metre a t carriageway cross ings , o r as d i r ec t ed by the Engineer where uns tab le s o i l condi t ions e x i s t . Cement-stabilized ma te r i a l s h a l l be mixed damp and s h a l l be placed immediately a f t e r being mixed and compacted wi th in 4 h a f t e r being placed. Trenches i n Clay o r Unstable Material . opinion of the Engineer, is unstable, bedding of thickness a t l e a s t 150 mm s h a l l be placed under and alongside the duc t o r nes t and above the duct o r upper layer of duc ts .

DUCT LAYING S t r a i g h t Laying. Ducts s h a l l be l a i d and jo in t ed t rue to l i n e and s h a l l be evenly supported f o r t h e i r f u l l l ength on t he bedding. which s h a l l be evenly and thoroughly compacted. alongside the trench, ca re s h a l l be taken t o avoid s t r a i n i n g of the j o i n t s when the ducting is lowered i n t o the trench. The in s ides of ducts s h a l l be kept c lean as they a r e l a id . Curved Laying. telephone cables , and s h a l l be achieved by o f f s e t t i n g ind iv idua l duct lengths by not more than 35 nun f o r each 3 m of duct length. Draw Wire. through each length of duc t ing a f t e r proving (see 7.3) has been completed. l e a s t 2 m , n e a t l y co i led , s h a l l be l e f t a t each end of each length of duc t ing . be plugged t o prevent the ing res s of d i r t . Draw Pi;s . o r ordered. Unless otherwise shown on t he drawings, draw p i t s s h a l l be of i n t e rna l s i z e a t l e a s t 600 m x 600 nun and of depth a t l e a s t I m and s h a l l be b u i l t i n 230 nun brickwork on a concrete base s l a b of thickness a t l e a s t 150 mm. The duc t s s h a l l be secure ly b u i l t i n t o t h e br ick wa l l s . manhole cover s e t a t a l eve l t ha t conforms t o the ex i s t ing road o r footway l eve l and camber. The type of cover s h a l l be one of the following, as scheduled: a ) An approved footway-type o r roadway-type frame and cover, a s appl icable , f o r telephone se rv ices ; o r b) a Type 2A c i r c u l a r manhole cover and frame ( f o r use i n roadways) o r a Type 6 square manhole cover and frame ( f o r use elsewhere than i n roadways) complying, i n each case, with the re levant requirements of SABS 558.

BACKFILLING AND COMPACTION.

.---

Where work is required to be ca r r i ed out i n the proximity of bu i ld ings , b r idges ,

-- No bedding s h a l l be placed u n t i l the Engineer has approved the trench

-__I--

The procedure f o r mul t i - layer pitch-impregnated

Where a t rench has been excavated i n clay o r i n s o i l which, i n the

-- I f lengths of ducting a r e jo in t ed

A change of d i r e c t i o n o r grade of a duct i s permiss ib le only i n the case of duc ts f o r - A s i n g l e s t rand of galvanized i ron draw wire of nominal diameter 2,5 m s h a l l be in se r t ed ---

A surp lus of wire of length a t A l l open ends of ducts s h a l l

If draw p i t s a r e included i n the con t r ac t , they s h a l l be constructed where shown on the drawings

Each draw p i t s h a l l be provided with a

The re levant requirements of Subclauses 5.6 and 5.7 of SABS 1200 DB s h a l l apply.

7 SABS 1200 LC-1981 Cable ductn

5.5

5.6

5.7

5.8

5.9

5.10

5.11

6. 6. I

6.2

7. 7. I

7.2

7.3

CONCRETE ENCASEMENT. Where so required, duc t s s h a l l be encased i n concrete i n accordance wi th the requirements of t he p ro jec t spec i f i ca t ion .

LAYING OF CABLES WITH OTHEK SEKVICES. Where one or more cables a r e t o be l a i d i n a trench containing o the r s e rv i ces , t he Contractor s h a l l l ay the cable duc t ( s ) along one s ide of t he trench with the o ther s e rv i ces occupying the o the r s i d e but , before comnencing excavation f o r such a trench, the Contractor s h a l l , un less t he requirements a r e given i n the p ro jec t s p e c i f i c a t i o n , o r on the drawings, or i n the schedule, ob ta in from the Engineer i n s t ruc t ions on whether the requirements of 5.1.1 and 5.7 and t h e requirements of Subclauses 5.4 and 8.2.3 of SABS 1200 DB a r e appl icable , or whether some o the r requirement i s appl icable to t he trench width.

CROSSINGS OF TELEPHONE AND ELECTRICITY CABLE DUCTS. supply cab le duc ts , s t r ic t precautions and ca re s h a l l be taken and c lose supervision given t o the laying o f t he ducts. Except where i t i s acceptably encased, no e l e c t r i c i t y supply cable s h a l l be l a i d wi th in a d i s t ance of 600 mm measured ho r i zon ta l ly , nor s h a l l any such cable c ros s wi th in a d i s t ance of 300 mm measured v e r t i c a l l y . from any telephone cable. Where an e l e c t r i c i t y supply cable and a telephone duct a r e l a i d i n a common trench the hor izonta l d i s t a n c e between the cable and the duc t s h a l l be a s d i r ec t ed by the Engineer. A t each c ross ing the Contractor s h a l l provide and i n s t a l l an approved type of s p l i t s leeve cons i s t ing of two half-round pipe sec t ions f i rmly fas tened together wi th robus t s t a i n l e s s steel s t r aps . The s l eeve s h a l l extend a t l e a s t 1,0 m on each s ide of the c ross ing and s h a l l be e f f ec t ive ly sea led a t the ends. The ma te r i a l used f o r t he s p l i t s leeve s h a l l be as spec i f i ed i n the p ro jec t spec i f i ca t ion .

ROAD CROSSINGS. A t each road cross ing a duc t or duc ts , of s i z e s u f f i c i e n t to rece ive the cable o r cables t o be l a i d , s h a l l be i n s t a l l e d under the road. The duc t ( s ) s h a l l be l a i d t o the same l i n e and l e v e l as t h a t a t which the cab le ( s ) a r e t o be l a i d , with due regard f o r the requirements of minimum cover under the road. The duc t ( s ) s h a l l extend a d is tance of a t l e a s t 0 , s m beyond each kerb face o r the edge of t he road, a s appl icable .

DUCT ROUTE MARKERS. d i r e c t i o n , and a t i n t e r v a l s not exceeding 60 m along the s t r a i g h t . approximately 25 mm above the f in i shed ground l eve l , except where they a r e l i k e l y to cause obs t ruc t ion o r be i n the way of moving t r a f f i c , i n which case the Contractor s h a l l ask the Engineer f o r i n s t ruc - t i ons i n t h i s regard. In add i t ion t o marking the route, the Contractor s h a l l submit t o the Engineer a record s e t t i n g out the pos i t i on of a l l rou te markers.

POSITION TO BE MARKED. c ros s ing s h a l l be ind ica ted by the letters "GPO" o r "ESC", a s appl icable , pa in ted by means of an approved s t e n c i l wi th red pa in t on t he kerb f ace d i r e c t l y above the pos i t i on of the duct. Where the re i s no kerb face , a s i n the case of unconstructed roads, rou te markers s h a l l be i n s t a l l e d a t such cross ings .

REPAIRS AND REINSTATEMENT OF SURFACES. requi red i n terms of Subclauses 5.9 and 5.10 of SABS 1200 1)B.

TOLERANCES ALIGNMENT AND GRADE. ordered, t he devia t ion from a s t r a i g h t l i n e jo in ing the ends of any s t r a i g h t s ec t ion of duc t ing s h a l l no t a t any poin t along a duct exceed 35 mm.

MOISTURE CONTENT AND DENSITY. the ac tua l dens i ty s h a l l be nowhere l e s s than the spec i f i ed dens i ty .

TESTING ACCESS FOR ENGINEER. necessary, f o r the inspec t ion and t e s t i n g of the duc ts dur ing manufacture, t he Contractor s h a l l arrange f o r the Engineer t o have f r e e access a t a l l reasonable times t o the place where the duc ts and o ther ma te r i a l s a r e manufactured. charge, every f a c i l i t y , including proper ly ca l ib ra t ed and maintained test appara tus , and a l l labour requi red f o r such inspec t ion and t e s t i n g (including sampling) and f o r the marking of the duc ts before de l ive ry .

COMPACTION TESTS. of t he backf i l l i ng . I f t h e test r e s u l t s show t h a t the dens i ty of t he b a c k f i l l does not comply with the r e l evan t requirements, t he cos t s of the t e s t i n g and any reconipaction and r e t e s t i n g t h a t may be ordered by the Engineer s h a l l be borne by the Contractor.

PROVING. s h a l l be thoroughly cleaned by twice drawing a cy l ind r i ca l c leaning brush through each duc t , once i n each d i r ec t ion . The duc ts s h a l l then be proved by drawing through them a polished hardwood mandrel having sphe r i ca l ends and of length 300 mm. The diameter of the mandrel s h a l l be less than the i n t e r n a l diameter of the duct by a ) 2 nun i n the case of duc ts of diameter up t o and including 75 mm; b) 3 mm i n the case of duc t s of diameter g rea t e r than 75 mm.

Wherever telephone cable duc ts c ross e l e c t r i c i t y

E l e c t r i c i t y supply cable duc ts s h a l l c ros s below telephone cable ducts.

Duct route markers ( see 3.4) s h a l l be placed above the cable a t a l l changes of Duct rou te markers s h a l l protrude

I f required in terms of the p ro jec t spec i f i ca t ion , t he pos i t i on of each duct

Exis t ing paved sur faces s h a l l be repa i red and r e i n s t a t e d as

Except where a change of d i r e c t i o n or other alignment is shown on t he drawings o r

The permiss ib le dev ia t ion from OMC during f i e l d compaction is 22 %, and

For the purpose of examining and sampling the duc t s and o ther ma te r i a l s and, i f

The Contractor s h a l l a l s o a r range f o r the manufacturer t o supply, f r e e of

The Engineer may order dens i ty t e s t s t o be ca r r i ed out t o determine the compaction

Af te r t he lay ing of ducts and t h e backf i l l i ng have been completed, the i n t e r i o r of the duc ts

and

SABS 1200 LC-1981 Cable duc ts

8

8 . 8 . I

8 .2 8 . 2 . I

8.2.2

8.2.3 8.2.4

8.2.5

8 .2 .6

8.2.7

8.2.8

8.2.9

MEASUREMENT AND PAYMENT GENEKAL. 1200 D B , the re levant items f o r t renches w i l l be scheduled sepa ra t e ly wi th the appropr i a t e s e rv i ces .

SCHEDULED lTEMS

Although measurement and payment f o r excavation and b a c k f i l l i n g of t renches i s covered i n SABS

S i t e clearance. Subclause 8 . 2 of SABS 1200 C s h a l l apply. Excavation a ) Excavate i n a l l ma te r i a l s f o r trenches, b a c k f i l l , compact, and dispose of surp lus

When s i t e clearance i s t o be ca r r i ed out by the Contractor, t he r e l evan t items given i n I__-

-~ . . 7

mater ia l ............................................................................... Unit: m o r m Items w i l l be provided f o r trenches of various widths and depths according t o s i z e and number of duc t s a s shown on the appl icable drawing. Where measured volumetr ica l ly i n terms of Subclause 8.1.2(a) of SABS 1200 DB, the volumes of duc t and cable t rench excavations w i l l be computed from each length and the inve r t depth ind ica ted on the drawings o r t he depth t o the bottom of the spec i f i ed bedding l aye r , whichever is the g r e a t e r , and from the base width determined from the re levant s ide allowance given on the appl icable drawing. The r a t e s h a l l cover the cos t of complying with the sa fe ty and p ro tec t ion requirements of 5.1.2 (except where p a r t i c u l a r items a r e scheduled t o cover p a r t i c u l a r c o s t s ) , excavation, b a c k f i l l i n g , compacting, and disposing of surp lus mater ia l .

--

3 b) Extra-over i t k m (a) above fo r : 1 ) Intermediate excavation ............................................................. Unit: m, 2) Hard rock excavation ................................................................ Unit: 3) Boulder excavation, Class A ......................................................... Unit: 4) Boulder excavation, Class B ......................................................... Unit: The r a t e s h a l l cover the addi t iona l cos t of the excavation and the handling of the more d i f f i c u l t mater ia l and, i n the case of rock, of the d isposa l within a d is tance of 0.5 km and the replacement of the higher proportion of unsui tab le ma te r i a l . c ) Excavate unsui tab le mater ia l from t rench bottom and d i s o se of it (provis iona l ) ..... Unit: m Thdvolume w i l l be computed from the trench width d e t e r m d d i n accordance with 8.2.2(a) and the add i t iona l

m. m3 m3

3

depth ordered. The rate s h a l l cover the cos t of the excavation of t he add i t iona l depth i n any ma te r i a l and the d isposa l it. -- Shore trench a t structure? The provis ions of i t e m (a ) of Subclause 8.3.4 of SAAS 1200 DA s h a l l apply. Reins ta te road sur faces complete with a l l courses. The provis ions of Subclause 8.3.6.1 of SABS 1200 DB s h a l l apply. Supply, lay, bed, and prove duc . ....................................................... Unit: m Separate items w i l l be scheduled f o r each diameter of duct. The r a t e s s h a l l cover

--- -

of

a ) f o r GPO duc t s , the cos t of c o l l e c t i n g the duc t s and the c o s t of l ay ing , j o i n t i n g . bedding, bu i ld ing i n t o draw p i t s , proving, and providing draw wire a s spec i f i ed ; and b) f o r a l l o the r duc ts ,as f o r ( a ) above and the cos t of providing the duc t s . Imported beddin mater ia l , where ordered ............................................... Unit: m A sepa ra t e itemgwill be scheduled f o r eahi se l ec t ed mater ia l obtained from designated sources. s h a l l cover the cos t of acqui r ing , loading, and t ranspor t ing the ma te r i a l from the designated source , and of d i s t r i b u t i n g the mater ia l along the length of the trench. Draw pits/manholes ..................................................................... Unit: No. Separate items w i l l be scheduled f o r d i f f e r e n t s i z e s of draw p i t s and manholes. cos t of add i t iona l excavation, d i sposa l of surp lus excavated ma te r i a l , supplying ma te r i a l s , and cons t ruc t ing t h e draw p i t o r manhole, as appl icable , complete i n accordance with the d e t a i l s shown on the drawings. Cable markers a ) Route markers ....................................................................... Unit: No. b) Kerb marks .......................................................................... Unit: No. The r a t e s h a l l cover the c o s t of the manufacture and i n s t a l l a t i o n of the markers, t he painting. i n sc r ib ing , o r stamping ( a s appl icable) of the i d e n t i f i c a t i o n marks on t he markers or kerb (as r e l e v a n t ) , and of preparing and submitt ing the record of a l l cab le rou te markers (see 3.4, 5.9, and 5.10). Overhaul of su r l u s excavation (provis iona l ) ........................................... Unit: m3.km The r a t e s h a l l :over the c o s r o f loading and overhaul of surp lus excavation where ordered i n wr i t i ng , measured from the poin t of loading t o the poin t of placing i n one d i r e c t i o n only by the s h o r t e s t p rac t i cab le route .

3

The r a t e

- The r a t e s h a l l cover the

~-

9 SABS 1200 LC- 198 1 Cable ducts

I PIPE

TRENCH WIDTH = 300 TRENCH DEPTH= 800

PIPE DIAMETER (WITH COUPLING) = 125

4 PIPES

8 W

1 F I ul

( d ) TRENCH WIDTH = 750 TRENCH DEPTH ' 8 0 0 PIPE DIAMETER (WITH COUPLING) = 125

Dimensions in millimrtrer

2 PIPES I 0 z W

I- r- a

TRENCH WIDTH = 450 TRENCH DEPTH = 800 PIPE DIAMETER '(WITH COUPLING) = 125

5-8 PIPES

5 w K c d

o oio o 0 010 0

r s l I 375 j 375 I

( e ) TRENCH WIDTH = 7 5 0 TRENCH DEPTH = 1000 PIPE DIAMETER (WITH COUPLING) = 125

3 PIPES I 0 z W r a

TRENCH WIDTH = 600' TRENCH DEPTH = 800 PIPE DIAMETER (WITH COUPLING) = 125

MORE THAN 8 PIPES

I] PIPES LAID IN HORIZONTAL LAYERS OF 6 OR8 AND IN VERTICAL BANKS OF THE REQUIRED NUMBER

SIDE OF CENTRE-LINE OF TRENCH

3) SPACING BETWEEN PIPES : 50 4) SPACING BETWEEN BANKS:75

5) TRENCH WIDTH = llOO(6PIPES) I450(8PIPES)

6 ) TRENCH DEPTH = I OOO 7) PIPE DIAMETER (WITH

2) 3 OR 4 PIPES LAID ON EACH

COUPLING 1 = I25

( f )

Drawing LC - I -Trench Dimensions and Telephone and Low Voltage Power Cable Duct Positions

SARS 1200 LC-1981 Cab12 ducts

10

APPENDIX A. APPLICABLE SPANDARDS

Refe rence i s made CO t h e l a tes t issues of t h e f o l l o w i n g s t a n d a r d s :

SABS 286 SABS 558 SABS 559 SABS 791 SABS 819 SABS 921 SARS 946 SABS 1200 A SARS 1200 AA SABS 1200 C SARS 1200 D SABS 1200 nB

Asbes tos cement p r e s s u r e p i p e s ( conscanc o u c s l d r d i a m e t e r t ype ) Cast i r o n s u r f a c e boxes and manhole and i n s p e c t i o n c o v e r s and f r ames V i t r i f i e d c l a y sewer p i p e s and f l c t l n g s Unplas c i c i z e d p o l y v i n y l c h l o r i d e (UPVC) sewer and d r a i n p i p e s and p i p e f i t c l n g s Asbes tos cement sewer p i p e s Pi tch- impregnated f i b r e p i p e s and c o u p l i n g s Ashes tos cement p r e s s u r e p i p e s ( c o n s t a n t i n t e r n a l d i a m e t e r t ype ) C i v i l e n g i n e e r i n g c o n s t r u c t i o n : G e n e r a l C i v i l e n g i n e e r i n g c o n s t r u c t i o n : G e n e r a l (small works) C i v i l e n g i n e e r i n g cons c r u c c i o n : S i t e c l e a r a n c e C i v i l e n g i n e e r i n g c o n s c r u c c l o n : Earchworks C i v i l e n g i n e e r i n g cons t r u c t i o n : Earchworks ( p i p e t r e n c h e s )

ISBN 0626-06042-7 wba pia

Title page1. SCOPE 2. INTERPRETATIONS 3. MATERIALS 4. PLANT 5. CONSTRUCTION 5.1 EXCAVATION OF TRENCHES 5.2 BEDDING AND COMPACTION OF BEDDING 5.3 DUCT LAYING 5.4 BACKFILLING AND COMPACTION5.5 CONCRETE ENCASEMENT5.6 LAYING OF CABLES WITH OTHER SERVICE5.7 CROSSINGS OF TELEPHONE AND ELECTRICITY CABLE DUCTS5.8 ROAD CROSSINGS5.9 DUCT ROUTE MARKERS5.10 POSITION TO BE MARKED5.11 REPAIRS AND REINSTATEMENT OF SURFACES

6. TOLERANCES 7. TESTING 8. MEASUREMENT AND PAYMENT 8.1 GENERAL8.2 SCHEDULED lTEMS

APPENDIX A - APPLICABLE STANDARDS Return to List of eStandards