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8/18/2019 MBA Summer Term Report
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SUMMER
INTERNSHIP
REPORT
Project Planning , Scheduling & Material Planning
for Naitwar Mori HeP (2 x 30 MW)
SUBMITTED BY:
Kshitij Thakur
ICDEOL Roll No. 6872
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ACKNOWLEDGEMENT
It gives me immense pleasure to express my deep sense of gratitude to Er. Rewati Raman forhis unparalleled guidance and continuous support at every stage of my work. I enjoyed every bit
of my work as he has been so humble and a constant source of inspiration from day one. Despite
their hectic schedule and preoccupations he always willingly remedied all my queries. I find
myself privileged and express my appreciation for the impetus he provided at every level of myproject otherwise it would not have been possible to complete this work in the present format. I
shall always remain indebted to him.
I express my heartfelt thanks to Er. Jaswant Kapoor. (Sr. Manager) for their constant
encouragement, support and guidance.
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CANDIDATE’S DECLARATION
I hereby certify that the work which is presented in the project entitled “PROJECT
SCHEDULING , MANPOWER & MATERIAL PLANNING FOR NAITWAR MORI
HYDROELECTRIC PROJECT” is an authentic, record of my own work carried out during
the period from Januray, 2016 to March 2016 under the supervision of Er. Rewati Raman ,
SJVN Ltd., Shimla.
Kshitij Thakur , ICDEOL , HP University Shimla .
This is to certify that the above statement made by the candidate is correct to the best of my
knowledge.
Signature of the supervisor(s)
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CONTENTS
TOPIC PAGE NO:
! Hydropower scenario of India…………………………………………………………….6
! SJVN- A Profile………………………………………………………………...................9
PRESENT SCOPE OF STUDY
!
Naitwar Mori Hydroelectric Project
• Introduction………………………………………................................................12
• Need for project……………………………………………………………….....13
•
Salient features…………………………………………………………………..14
• Type of project…………………………………………………………………...19
•
Location of project site………………………………………………..................19
• Topography and geology of project area………………………………………...20
• General climatic conditions in the project area………………………………….20
! Project Planning & Scheduling of Naitwar Mori Hydroelectric Project
! Material Planning for Barrage Complex of Naitwar Mori Hydroelectric Project
! Conclusion……………………………………………………………………………….41
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HYDROPOWER SCENARIO OF INDIA
India is the second fastest growing economy of the world and the 6th largest energy consumer
which accounts for 3.4% of the total world energy consumption. As the country continues to
tread on the road to growth and development, dependable and reliable energy sources become a
prerequisite. India is endowed with economically exploitable and viable hydro potential assessed
to be about 84,000 MW at 60% load factor (1,48,701 MW installed capacity). In addition, 6780
MW in terms of installed capacity from Small, Mini, and Micro Hydel schemes have been
assessed. Also, 56 sites for pumped storage schemes with an aggregate installed capacity of
94,000 MW have been identified. However, only 19.9% of the potential has been harnessed so
far. India is endowed with rich hydropower potential; it ranks fifth in the world in terms of
usable potential. However, less than 25% has been developed or taken up for development. Thus
hydropower is one of the potential sources for meeting the growing energy needs of the country.
A judicial mix of hydropower in the energy portfolio can also contribute to energy security,reduction of greenhouse gas emissions, meeting the peak demand and also increased flexibility in
grid operation. Besides, projects may also be conceived as multi-purpose ones contributing not
only to power but also to irrigation, flood control, navigation, etc. The Government of India is,
therefore, giving special emphasis to accelerated hydropower development in its power
development plans.
In the past various factors such as the dearth of adequately investigated projects, environmental
concerns, resettlement and rehabilitation issues, land acquisition problems, regulatory issues,
long clearance and approval procedures, power evacuation problems, the dearth of good
contractors, and in some cases, inter-state issues and law and order problems have contributed tothe slow pace of hydro power development. There have been large time and cost overruns in case
of some projects due to geological surprises, resettlement and rehabilitation issues, etc. However,
considering the large potential and the intrinsic characteristics of hydropower in promoting the
country’s energy security and flexibility in system operation, the Government is keen to
accelerate hydropower development. For the purpose of which it has taken up many initiatives in
this direction. A number of hydropower corporations have also been established in the central
sector and in the joint sector (Central and State). These include the NHPC, North-Eastern
Electric Power Corporation (NEEPCO), Nathpa-Jhakri Power Corporation (NJPC) now SJVN
Limited and Tehri Hdyro Development Corporation (THDC).
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INDIA’S POWER SCENARIO
The primary energy sources of India are coal, nuclear fuel and hydro power. Indian Power
System is a mix of all these conventional sources of Electrical Energy. India’s Installed Capacity
as on 31.12.2008 is as under:
The sector wise Hydro Capacity as on 30.10.2008 are as under:
• Central : 8592.00 MW
• State : 26825.76 MW
• Private : 1230.00 MW
The total installed capacity- Hydro is 36647.76 MW.
HYDROPOWER DEVELOPMENT IN INDIA
India is blessed with immense amount of hydro-electric potential and ranks 5th in terms of
exploitable hydropotential on global scenario. India has achieved a fairly high degree of self-
reliance in hydropower technology. Nevertheless, there is a continuing thrust toward adoption of
new technologies.
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SJVN - A PROFILE
SJVN a MINI RATNA & Schedule ‘A’ CPSU under the Ministry of Power, Govt. of India, is a
joint venture between the Govt. of India & Govt. of Himachal Pradesh . Incorporated in the year
1988, the company is emerging as a power player in the country. The present authorised capital
of SJVN is 7000 crores.
Beginning with single project and single state operations (i.e. NATHPA JHAKRI which is
India’s largest hydroelectric power plant in Himachal Pradesh) the company is presently
implementing hydroelectric projects in Himachal Pradesh, Uttrakhand and Manipur besides
neighboring countries viz. Nepal and Bhutan. Recently it has taken up survey & investigation of
four hydroelectric projects in Arunachal Pradesh.
For its meritorious performance during the year 2010-11, the company’s 1500 MW Nathpa
Jhakri power station was awarded “GOLD SHIELD” by the Ministry of Power in the Category
of “Performance of Hydro Power Station”.
The present installed capacity of SJVN is 1500 MW .the capacity addition under various stages
of implementation by the corporation is 5241 MW (412 MW- under construction, and 4829 MW
under various stages of clearance.
SJVN is committed to generating reliable and eco-friendly power by State of Art Technology,
excellence in engineering and continual improvement in quality management. SJVN, as an ITsavvy cooperation has established and is following sound business, financial and regulatory
policies. SJVN believes that employees are its most valuable assets and has evolved growth
oriented Human Resource Development Strategy.
SJVN – A MINI RATNA COMPANY
SJVN was conferred with the prestigious “MINI RATNA”: Category- I” status by the
Government of India in the year 2008 within only four years of coming into commercial
operations.
SJVN – SCHEDULE ‘A’ COMPANY
Meeting the criteria laid down by the Department of Public Enterprise and qualifying the
qualitative and quantitative parameters viz. Investment, capital employed, net sales, profits,
employees, and also factors of national importance, complexities of problem faced, level of
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technology adopted, prospects for expansion and diversification, competitiveness etc.
SJVN was upgraded as schedule ‘A’ PSU in 2008.
1500 MW Nathpa Jhakri Hydro Power Station (NJHPS)
SJVN is presently operating the country’s largest 1500 MW Nathpa Jhakri Hydro Power Station(NJPHS) in Himachal Pradesh which has been recognized as engineering marvel. Commissioned
in the year 2003-04, the power is since supplying valuable power to the nine northern grid states
including U. T. of Chandigarh. It is endowed not only with the state-of-the-art-technology and
know- how to tackle the Himalayan Geology but has also developed the requisite know-how
and capability to conceptualize, optimize, and develop the power potential of hydro power
development schemes of all sizes.
FINANCIAL PERFORMANCE
During financial year 2011-12, SJVN has generated a total 7610.257 million units of electricityand achieved a total income of 2136.79 crores including other income, thus earning a net profit
of 1068.28 crores.
FUTURE PROJECTS
S.N. NAME OF PROJECT CAPACITY IN
MW
LOCATION
1 Rampur HE Project 412 MW Himachal Pradesh
2 Luhri HE Project 588 MW Himachal Pradesh
3 Dhaulasidh HE Project 66 MW Himachal Pradesh
4 Devsari HE Project 252 MW Uttarakhand
5 Naitwar Mori HE Project 60 MW Uttarakhand
6 JakholSankri HE Project 51 MW Uttarakhand
7 Arun – III HE Project 900 MW Nepal
8 Kholongchu HE Project 600 MW Bhutan
9 Wangchu HE Project 570 MW Bhutan
10 Tipaimukh HE Project
(in JV with NHPC & Govt. of
Manipur)
1500 MW Manipur
11 Kameng-I HE Project Under Investigation Arunachal Pradesh
12 Ranganadi-II HE Project Under Investigation Arunachal Pradesh13 Si-River basin Under Investigation Arunachal Pradesh
14 DoiMukh stage- II Under Investigation Arunachal Pradesh
15 Wind Power 47.6 MW Maharashtra
16 Buxer thermal power plant(MoU
signed)
1320 MW Bihar
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THERMAL ENERGY: SJVN is also venturing into the field of thermal power generation with
capacity of 1320 MW(2x 660 MW) super critical plant in Bihar and MoU signed with Govt. of
Bihar during January 2013 .To meet with the requirement of coal a coal block is allotted by GOI
in west Bengal.
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NAITWAR MORI HEP(60MW)
INTRODUCTION
The Naitwar-Mori Hydroelectric Project located in Uttarkashi district of Uttarakhand stateenvisages utilization of the water of river Tons for power generation on a run of the river type
development harnessing a head of about 96.76 m.
In November 2006, Lahmeyer International Engineering Consultants with its companies in Indiaand in Germany were entrusted by Satluj Jal Vidyut Nigam Ltd with the contract for Preparation
of Feasibility Study Report, Bankable Detailed Project Report, Bid Documents, Bid level
Drawings and Technical Specifications.
The project will harness 2,300 million m3 of Tons River’s annual run-off at Naitwar village in
Uttarkashi District. The generation capacity of the project with Installed Capacity of 60 MW (2 x
30 MW) is 263.50 GWh in a 90% dependable year.
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NEED FOR PROJECT
India’s hydropower potential is estimated at around 1, 50,000 MW, out of which only 30,000
MW (20%) has been tapped so far. On the other hand, the gap between demand and supply ofpower has been increasing at a much faster rate as the country’s economic growth rate picked up
in the last decade. Demand for electric energy is growing at an average annual compound growth
rate of 7-8% per year , there is a shortfall in energy by 9% and in peak demand by 14%.
Presently, the total installed capacity in India is 1,30,000 MW which is almost 22% less than thepresent requirement 1,60,000 MW. To overcome this acute power shortage, Government of India
has initiated a number of steps for development of new power projects and provide power for all
by 2012. Out of this, hydropower is expected to account for almost 50%.
Development of hydropower potential can significantly help bridge the gap between power
demand and supply. In addition to meeting the power demand of the country, development of
hydropower also helps in the development of water resources in general.
The development of hydropower in Uttarakhand will not only benefit the state but also meet the
power requirements of the neighbouring states and northern region of the country. Uttarakhand is
presently a net importer of electric power, but generates a seasonal surplus and plans to become a
net exporter of power by 2010 by expanding its hydropower and high voltage transmissioncapacity. Total capacity expansion of 10,000 megawatts(MW) is planned by the year 2018. The
development of Naitwar Mori project is a step in the direction of achieving the above targets.
The Naitwar Mori Hydroelectric Project (NMHEP) forms part of the cascade of developmentplanned along river Tons. There are two hydropower projects under operation on river Tons .
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SALIENT FEATURES
I) LOCATION
1)
State Uttarakhand
2)
District Uttarkashi
3)
Tehsil Mori
4)
Latitude 31 03’35’’N
5)
Longitude 78 05’ 43’’E
6)Nearest rail head Dehradun
7)Nearest airport Dehradun
8)Name of river/tributary Tons (tributary of Yamuna)
9)
Name of river basin Yamuna river basin
II) HYDROLOGY AND CLIMATE
1)Catchment area upto head works(km2) 1514 km2
2)Snow catchment area(km2) 90.84 km2 (6% of total)
3)
Average annual yield(Mm3) 2055
4)
Maximum/ Minimum yield (Mm3) 3771/1209
5)
Design flood(m3/s) 1600 (1in 100 yr.)
6)
90% available discharge(Mm3) 1273
7)
Maximum temperature 41 C
8)
Minimum temperature 3.8 C
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III) DIVERSION STRUCTURE
1)Type Barrage
2)
Maximum height above deepest
foundation
30.5 m
3)
River bed level EL 1249.00 m
4)
Elevation at top of barrage EL 1269.5 m
5)
Length of barrage at top (m) 48.9 m
6)
Freeboard (m) 1.5
7)
No . and size of gates RADIAL GATES
• 2 nos-9.1m(W) x 8.0 m(H)
•
1 no-9.1m(W) x14.5 m(H) with flapgate of 6m(W) x4.15m(H)
IV) RESERVOIR
1)
FRL(m) 1267.0 m
2)
MWL(m) 1268.0 m
3)
MDDL(m) 1261.0 m
V) SUBMERGENCE (Ha)
At FRL
Total (Ha)4.90
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V) DIVERSION CHANNEL
1)Size(dia. in m), type and number 20 m(W) x 5.5 m(D) channel, 1 in no.
2)
Length (m) 210 m
3)Discharge (m3/s) in channel 250 m3/s (for 1 in 25 yr.)
4)
u/s coffer dam height and length 4m(H) x 15m(W) x 50m(L)
5)d/s coffer dam height and length 4m(H) x 15m (W) x 57m(L)
VII) DESILTING TANK
1)
Type Open, twin chamber
2)
Number and size-L(m) x B(m) x H(m) 2 in no.
130(L) x 25(W) x 13.5(H)
3)Particle size to be removed 0.2
VIII) HEAD RACE TUNNEL
1)Length (m) and shape 4330, modified horse shoe
2)
Diameter (m) 5.6 m (finished)
3)Design discharge (m3/s), velocity (m/s) 73.5,2.88
4)
Number of adits 2 in no.
IX) SURGE SHAFT
1)
Type Simple
2)
Diameter (m) 18 m
3) Height (m)51.65 m
4)Top elevation EL 1291.00 m
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5)
Bottom elevation EL 1239.34 m
X) PRESSURE SHAFT/ PENSTOCK
1)
Type Pressure shaft
2)Number of pressure shaft/ unit penstocks One/two
3)
Maximum discharge through pressure
shaft/ penstock(m3/s)
73.5
4)Diameter of pressure shaft(m) 4.0 m
5)
Maximum velocity(m/s) 5.85 m/s
6)
Length of pressure shaft (m) 109.0 m
7)
Penstock gate at surge shaft 1 in no.
8)Main inlet valve (type, dia) 2 nos., 2.5 m (butterfly)
XI) UNDERGROUND POWER HOUSE
1)Type Underground
2)
Location Near Keval village
3)Installed capacity 2 x 30.0 MW =60 MW
4)
Number of units 2
5)Rated turbine output 30.61 MW
6)
Gross head(m) 96.76 m
7)
Net design head 90.76 m
8)
Type of turbine Vertical francis
9)Maximum flow through each unit (m3/s) 36.75
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10)
Speed specific and synchronous 222.9 rpm, 300 rpm
11)For generator/generator motor
• Type
• Design capacity
•
Power factor, generatorvoltage(kV)
• Excitation system (type)
-synchronous
-30.0 MW
-0.9, 11-Static
12)
Size of machine hall 57.70 m(L) x 18.60 m(W) x 33.07 m(H)
13)Size of transformer cavern 39.60 m( L) x 11.90 m(W) x 13.65 m(H)
14)
Transformers 11/220 Kv
XII) TAILRACE TUNNEL/ CHANNEL
1)
Tailrace tunnel D-shaped, 8.0 m(W) x 8 m(H)
2)Length of tailrace tunnel 235.62 m
3)
Tailrace channel 6.0 m (W) x 5.75m (H)
4)Length of tailrace channel 60.39 m
XIII) POWER BENEFITS
1)Design energy(GWh/annum) 263.50
XIV) CONSTRUCTION PERIOD 4 yr.
XV) COST ESTIMATES(Rs. In lacs) PRESENT DAY COMPLETED
1)
Civil 28009.77
2)
Electrical/ mechanical 10426.64
3)
Sub total (generation) 38436.41
4)IDC and FC 4419.26
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TYPE OF PROJECT
The NMHEP envisages a run-of-the-river scheme with possible diurnal storage for peaking
power. The project shall harness the hydro power potential between Naitwar and Mori villages
by utilizing a gross head of about 96.76 m.
LOCATION OF PROJECT AREA
The NMHEP is located about 408 km NE of Delhi and 173 km N of Dehradun and on the Tons
River in Uttarkashi district in the state of Uttarakhand. The potential barrage site is located some
580m d/s of the confluence of Rupin and Tons rivers at village Naitwar. The potential dam sites
are located some 0.58 and 2.5 km d/s of the confluence of the Tons and Rupin rivers, and some10 km upstream from Mori. The potential powerhouse location is on right bank at about 3.5 to 5
km further downstream from the dam sites.
Fig 1. Project area location map
5)
Total cost with IDC and front end fee
without escalation
42855.68
6)Total cost with IDC and front end feewith escalation
44978.38
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TOPOGRAPHY AND GEOLOGY OF THE PROJECT AREA
TOPOGRAPHY:The topography of the area is immature i.e. it shows rugged topography with lofty mountains,
steep slopes and a number of deep gorges. The valleys are generally ‘V’-shaped with alluvial
terrace deposits on either bank. The thickness of alluvial deposits varies between 10 m and 50 m.Tons river at Naitwar flows along a V shaped valley. A number of settlements have come upalong the river Tons as Tiuni, Naitwar and Menus.
GEOLOGY:Gentler slopes are covered with scree material, consisting of broken pieces of rock embedded inrock powder. At some places creep is observed in overburden material where the overburden
material is saturated with water and the toe of the material is eroded by river action or by human
activity.
GENERAL CLIMATIC CONDITIONS IN THE PROJECT AREA
The climate of the area is generally temperate; it is warm in summer, humid during monsoon and
cold in the winter. In the winter season, the higher regions of the Himalayas receive precipitationas snow while moderate rainfall occurs in the foothills and adjoining plains. There is no
temperature recording station within the catchment, however the temperature recorded in the
nearby town varies from 0° to 35°C.
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CONSTRUCTION METHODOLOGY & EQUIPMENT PLANNING
Construction Schedule
The project is proposed to be completed within a time span of 48 months (forty eight months).The construction of roads & bridges shall be completed within 16.5 months after award of
package. Activity wise tentative construction programme has been prepared and as shown in the
figure 1.0 . The project schedules are drawn with a view to complete all the works andcommission the project in the shortest possible duration. Construction activities in
different parts of the project will be so sequenced as to optimize the use of construction
equipment and machinery. Access to the various work sites and all the basicinfrastructure facilities are to be parallel activities alongwith works provided as.
For the construction of various components of the Project, it is proposed to mobilize the
latest equipment in order to get consistent quality and faster progress rate. Special attention
has been paid for the equipment planning for the underground works so as to optimize theequipment cost and extract faster progress rate as construction of underground works will be
critical considering the restricted working space and geological uncertainties to be
encountered.
1.1.2 (B) PROJECT COMPONENTS
Naitwar Mori Hydroelectric Project (NMHEP) envisages diversion of water from river Tons atabout 580 m downstream of its confluence with river Rupin for power generation by
constructing a Diversion Barrage. The diverted water would be carried to the powerhouse
through 5.60 m dia , Modified Horse-Shoe shaped and 4.313 km long Head Race Tunnel
(HRT) with a Twin chamber Surface Desilting Tank provided upstream of the HRT intake Theunderground powerhouse would be equipped with 02 Nos. units of 30.0 MW each, run by
vertical Francis type turbines. The water released by turbines is carried through a tailrace
tunnel/channel to join the river Tons at upstream of its junction with the Saira gad.
The project has been planned to have the following main component structures:
Diversion Barrage & Diversion Works
Power Intake and Desilting TankHead Race Tunnel
Surge Shaft (Under Ground)
Valve House
Pressure ShaftUnderground Powerhouse
Underground Transformer Hall
Tail Race Tunnel/channel
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DIVERSION BARRAGE AND DIVERSION WORKSa) Diversion Works
To facilitate the construction activities for the Barrage works, area has to be protected against the
possible monsoon flood with proper river care. River diversion works envisages
construction of Diversion channel on the right bank with upstream and downstreamcofferdams.
Diversion channel with invert level of E.L. 1252.50 m is proposed on the right bank to divert thenon-monsoon flood for providing dry working area during construction of Barrage. Length of
this diversion channel will be approximately 210 m with base of stone pitching
throughout the length. Excavation of the diversion channel will be carried out from upstream
and downstream ends in order to expedite the river diversion. Along the total length of channelstone pitching is done with concrete retaining wall on the river side. Excavator will be
mobilized to remove the excavated muck which will be removed through the suitable capacity
dumpers.
Once the diversion of river flow through channel is done, construction of cofferdam
on upstream and downstream side of the Barrage axis shall be commenced. Excavated
muck from channel works will be utilized for construction of cofferdams.
Cofferdams at both u/s and d/s will be constructed after excavating riverbed for about 1.0 m
to 1.50 m, and provided with clay core after providing closure dykes and diverting the river
flow into the Diversion Channel. During excavation of riverbed for cofferdams and
concurrent to rising of cofferdams, dewatering pumps will be used to pump excess water.A temporary causeway by using 1.2m dia hume pipes shall be constructed to cross the diversion
channel and to facilitate the stage-I & stage-II construction activities in Barrage area.
Equipments required for Diversion Channel & coffer dam (U/s & D/s both)
Excavator (2 cum) 1 no
Tipper (12 cum 18 T) 7 Nos
Crawler dozer,180 HP 1 No
Pneumatic crawler drill(76-110mm) 1 No
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b) BARRAGE
i) Excavation
Excavation of Barrage site area including the top soil removal is approximately estimated as
51,520 cum and excavation in rock is about 2740 cum. Total Excavation is divided into fourphases (Refer Drg. No.-4). Initially Excavation in abutment area will be commenced from Left
Bank (Phase-I) after rising of cofferdams. Excavation in the river bed portion will be
commenced after excavation of abutments. All these activities will be completed in one (01)month duration.
Excavation for the riverbed portion will be done in benches depending upon the level of
excavation is required to be carried out. Considering the depth of excavation to be carried out,
internal temporary ramps of suitable slope will be established for smooth removal of muck andmovement of other equipment. On reaching the requisite base levels along the barrage axis,
foundation treatment will be carried out. During excavation, in case of seepage water,
dewatering pumps will be mobilized to remove the excess water to provide dry area for
foundation treatment.
Excavation in Soil
Soil 51520 m3
Rock Excavation 2740 m3
Total available months 2 months
Time required for excavation in soil 1.75
Production in wet season 60%
Estimation of peak requirement
Total quantity of excavation 51520 m3
Average production in dry season 29440 m3/month
Total no of days available in a month 25 days
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No of working hrs available / day 20 3 shifts/ day
Work load per day 1178 m3/day
Work load per hour 58.9 m3/hour
Plan machinery for 10 %extra quantity= 65 m3/hour
Percent swell 20%
Peak quantity per hour (loose)= 78 m3/hour
Hydraulic Excavator-2m3
Volume to be handled per hour= 181.2 m3/hour
Time for one cycle = 20 seconds
No. of cycles per hr= 180
Capacity of excavator= 2 m3
Assuming bucket fill factor 0.9
Actual capacity of excavator 1.8
Ideal Production Capacity of excavator= 324 m3/hour
Job and Management factor= 0.81
Operating factor = 0.83
Actual output of excavator= 217.83 m3/hr
No. of excavators required= 0.36 No
say 1.00 No
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Add for standby= 0.20 No
Dumper-12cum 18 T
Bucket capacity 12 cum
assuming 75% capacity 75%
Actual capacity 9 m3
No. of excavator bucket load required to load tipper 5.0 No
Average lead= 1 km
Actual output of excavator= 217.83 m3/hour
Loading time for tipper (No. of bucket swingsX cycle time ofexcavator) 1.67 minutes
Spotting, turning and dumping time= 3 minutes
Loaded haul @ 15 kmph 4 minutes
Empty haul @ 20 kmph 3 minutes
Total cycle time= 11.67 minutes
Operating efficiency= 50 minutes/hour
No of trips by dumper= 4.3 trips/hour
Quantity carried by dumper= 38.57 m3/hour
No of dumpers required= 2.02 No
Actual No. of dumpers required= 3.00 No
Add for standby= 20%
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0.60 No
Excavation in Rock
Excavation in rock 2740 cum
Total available months 1 months
Time required for excavation in Rock 0.25
Production in wet season 60%
Estimation of peak requirement
Total quantity of excavation 2740 m3
Average production in dry season 10960 m3/month
Total no of days available in a month 25 days
No of working hrs available / day 20 3 shifts/ day
Work load per day 438 m3/day
Work load per hour 21.9 m3/hour
Plan machinery for 10 %extra quantity= 24 m3/hour
Percent swell 40%
Peak quantity per hour (loose)= 33.6 m3/hour
Drilling equipment required
depth of drill hole 1 m
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Density of drill holes 0.43 holes/sqm
Muck produced per sqm of drilling 1 cum
Quantity of muck to be handled per hour 33.6 m3/hour
No of drill holes required to produce peak quantity per hour 14.45 No.
Total drilling length required 14.45 m
Speed of the wagon drill 16 m/hr
No. of wagon drills required 1 No.
Hydraulic Excavator-2m3
Hydraulic Excavator
Volume to be handled per hour= 33.6 m3/hour
Time for one cycle = 25 seconds
No. of cycles per hr= 144
Capacity of excavator= 2 m3
Assuming bucket fill factor 0.75
Actual capacity of excavator 1.5 cum
Ideal Production Capacity of excavator= 216 m3/hour
Job and Management factor= 0.81
Operating factor = 0.83
Actual output of excavator= 145.22 m3/hr
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No. of excavators required= 0.23 No
say 1.00 No
Add for standby (20%)= 0.20 No
Dumper-12 cum 18 T
Bucket capacity 12 cum
assuming 75% capacity 75%
Actual capacity 9 m3
No. of excavator bucket load required to load tipper 6.0 No
Average lead= 1 km
Actual output of excavator= 145.22 m3/hour
Loading time for tipper (No. of bucket swings X cycle time ofexcavator) 2.50 minutes
Spotting, turning and dumping time= 3 minutes
Loaded haul @ 15 kmph 4 minutes
Empty haul @ 20 kmph 3 minutes
Total cycle time= 12.50 minutes
Operating efficiency= 50 minutes/hour
No of trips by dumper= 4.0 trips/hour
Quantity carried by dumper= 36.00 m3/hour
No of dumpers required= 0.93 No
Actual No. of dumpers required= 1.00 No
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Add for standby= 20%
0.20 No
Sr. No. Equipments used in Excavation
1 2 cum Hydraulic excavator 2.00
2 18 MT Dumper, 12 cum 8
3 324 HP, Crawler tractor dozer 2
4 Pneumatic crawler drill (76-110mm) 1
5 Electric Air compressor, 1000 cfm 1
6 Jack Hammer 2
ii) Concreting Works for Barrage
Total estimated concrete quantity for the Barrage portion is about 45,210 m3.Since full area ofBarrage is proposed to be protected against the river water by constructing cofferdams
on upstream and downstream side at inlet and outlet of Diversion Channel,
foundation treatment will be carried out on reaching the required level of excavation forBarrage base. It is proposed to provide lean concrete (M10) at Barrage bases along the width of
Barrage with Raft concrete for Pier foundation at E.L. 1241.50 m. Concrete will bepumped and conveyed to the required location through the Chute system. Concrete for the Raft
foundation and laying of Lean concrete will be carried out through the width of Barrage.
It is also proposed to provide seepage sealing arrangement of asphaltic concrete core cut
off wall on the left and right bank side of the earthen embankment upstream of barrage axis.
Concreting of piers will be done in lifts of maximum height of 1.50m. Concrete will be poured
through Truck mounted Crane. The maximum height to which the concrete is required to be
poured is about 16-18 m from the existing surface level. Shuttering handling for concreting of
piers and Breast wall will be done with Truck mounted crane.
Total estimated concrete quantity (grade wise) for various components of Barrage is worked out
as per the Drawings are as below:
Construction of barrage including diversion work has been divided into two stages. In Stage-I,
first phase includes construction of diversion channel work and filling for coffer dam
both at upstream and downstream of barrage axis. On completion of river diversion through
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the diversion channel, second phase will include the construction of barrage and intake
structure upto E.L. 1258.00 m. On completion of barrage concreting upto E.L. 1258.00 m,water will be redirected through the barrage portion. In Stage-II, concreting for the
remaining portion of barrage above E.L. 1258.00 m will be carried out along with the
installation of gates at barrage and intake structure. Simultaneously, excavation and
concreting works for the desilting basin will also be completed during this stage.
CONCRETING OF BARRAGE
Total quantity of the concrete to be poured 45210 cum
Total available months 16 months
Available dry months 12 months
Production in wet season 60%
Estimation of peak requirement
Total Quantity of concrete to be poured 40689.00 m3
Average production in dry season 2825.63 m3/month
Peak production per day 113 m3/day
No. of working hours per day 20 hours
Peak Production / hr 6 m3/hour
Plan for extra quantity @ 20%= 1.2 m3/hour
Loss in transportation and handling @ 5%= 0.3 m3/hour
Required rate of production per hour= 7.5 m3/hour
Batching and Mixing Plant
Ideal production rate of plant= 60 m3/hour
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Operating efficiency= 75%
Actual production rate= 45 m3/hour
0.75 m3/min
Required hourly production= 7.5 m3/hour
No. of batching and mixing plants required= 0.17 No
say 1.00 No
Add 30% for standby= 0.05 No
Actual No. of batching and mixing plants required= 1.00 No
60 cum/hr batching and mixing plant 1.00 No
Transit Mixers
Capacity of transit mixer= 6 m3
Assuming efficiency of mixer= 100%
Actual Capacity of mixer= 6 m3
Transit mixer cycle time:
Average lead= 1 km
Loading time= 8 minutes
Spotting, turning and unloading time= 4 minutes
Loaded haul @ 12 kmph 5 minutes
Empty haul @ 16 kmph 3.75 minutes
Total cycle time= 20.75 minutes
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Operating efficiency= 50 minutes/hour
No of trips by mixer= 2.41 trips/hour
Quantity carried by mixer= 14.5 m3/hour
Actual No. of mixers required= 0.52 No
say 1.00 No
Add for standby= 20%
say 0.2
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S.No. Equipment used in Concreting Quantity
1 Grouting Machine with Pump 2
2 Transit Mixers, 6 m3 5
3 Batching & Mixing Plant 60 m3/hr 1
4 Tower Crane 6T capacity 1
5 Air Compressor, 1500 cfm 1
6 Dewatering Pumps, 40kW 4
7 Pneumatic Sump Pumps 2
8 Water Sprinklers 8000 lit 1
9 Aggregate Processing Plant, 100 T/hr 1
10 Needle Vibrator 6
Material Planning for Barrage Complex of NMHEP
The material requirement for each component of the Barrage Complex has been worked out and
detailed as under:
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River Diversion Works
Diversion Channel
River diversion works envisages construction of Diversion channel on the right bank with
upstream and downstream cofferdams. Diversion channel with invert level of E.L.1252.50 m isproposed on the right bank to divert the non-monsoon discharge of 250 cum/sec (1 in 25 Years)
flood for providing dry working area during construction of Barrage. Length of this diversion
channel will be approximately 210 m with base of stone pitching throughout the length.
The following are the key points:
• Total quantity of Excavation involved is around 17180 cum.
• Diversion channel is envisaged to be completed in 1 month period.
• Total quantity of Concreting involved is around 1015 cum.
Details of Material requirement for Diversion Channel
Month
wise
Cement
(MT)
Fine
Agg.
(cum)
Coarse
Agg.
(cum)
Reinf.
steel
(MT)
Wire mesh
(MT)
Structural
Steel (MT)
Rock bolts
& Anchor
Bars (MT)Reference
9th 30.30 372.39 754.1 70 ---- ---- ---- Annex-A
Total 30.30 372.39 754.1 70 ---- ---- ----
Monthly requirement of above materials has been shown in Bar Chart as below:
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Coffer Dam
Once the diversion of river flow through channel is done, construction of cofferdam
on upstream and downstream side of the Barrage axis shall be commenced. Excavated
muck from channel works will be utilized for construction of cofferdams. Cofferdams at both
u/s and d/s will be constructed after excavating riverbed for about 1.0 m to 1.50 m, and
provided with clay core after providing closure dykes and diverting the river flow into the
Diversion Channel.
• The upstream and downstream cofferdam will be of a semi-permanent nature
• Height of Upstream cofferdam = 5.0 m
• Height of Downstream cofferdam = 5.0 m
• Period of 1 month has been envisaged for the construction both coffer dams in the first
season.
•
Total quantity of Excavation involved is around 3530 cum.• The contractor shall be required to identify the source of clay and store the adequate
quantity required for the coffer dam.
Barrage Structure
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The barrage structure of height 30.5 m (Max. height above deepest foundation level) and 48.9m
length at top is to be constructed. The proposed barrage site is located 580m d/s of the
confluence of Rupin and Tons rivers at village Naitwar. The following are the key points:
• Total quantity of Excavation involved is around 54260 cum.
•
Total quantity of Concreting involved is around 46295 cum.
Material requirement
Month
wise
Cement
(MT)
Fine
Agg.
(cum)
Coarse
Agg.
(cum)
Reinf.
steel
(MT)
Wire mesh
(MT)
Structural
Steel (MT)
Rock
bolts &
Anchor
Bars
(MT)
Reference
10.5th 33.75 21.88 ---- ---- ---- --- 5.34 Annex.-B
12th 67.5 43.78 --- --- --- --- 10.68
12.5th 864.16 734.44 4900.87 135.31 ---- ---- 5.34
14th 98.85 1425.09 9801.74 135.31 ---- ---- ----
15th 98.85 1425.09 9801.74 135.31 ---- ---- ----
16th 98.85 1425.09 9801.74 135.31 ---- ---- ----
18th 83.04 1197.08 2058.36 135.31 ---- ---- ----
19th 83.04 1197.08 2058.36 135.31 ---- ---- ----
20th 83.04 1197.08 2058.36 135.31 ---- ---- ----
21th
83.04 1197.08 2058.36 135.31 ---- ---- ----
22th 83.04 1197.08 2058.36 135.31 ---- ---- ----
23th 83.04 1197.08 2058.36 135.31 ---- ---- ----
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Month
wise
Cement
(MT)
Fine
Agg.
(cum)
Coarse
Agg.
(cum)
Reinf.
steel
(MT)
Wire mesh
(MT)
Structural
Steel (MT)
Rock
bolts &
Anchor
Bars
(MT)
Reference
24th 83.04 1197.08 2058.36 135.31 ---- ---- ----
25th 83.04 1197.08 2058.36 135.31 ---- ---- ----
26th 83.04 1197.08 2058.36 135.31 ---- ---- ----
27st 83.04 1197.08 2058.36 135.31 ---- ---- ----
28nd 83.04 1197.08 2058.36 135.31 ---- ---- ----
29rd 83.04 1197.08 2058.36 135.31 ---- ---- ----
29.5rth 41.52 598.54 1029.183 67.65 ---- ---- ----
Total 14311.34 20038.94 60035.67 2165 --- --- 21.371
Monthly requirement of above materials has been shown in Bar Chart as below:
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CONCLUSION
It was a wonderful learning experience at SJVN Limited on NAITWAR MORI HEP for 8 weeks
in Shimla. I gained a lot of insight regarding almost every aspect of project scheduling &
management , material planning involved in a project. The friendly welcome from all theemployees is appreciating. They shared their experience and knowledge which they have gainedin the long journey of their work. I hope this experience will help me in future and also in
shaping my career.