MBA Summer Term Report

8/18/2019 MBA Summer Term Report

1/39

1

SUMMER

INTERNSHIP

REPORT

Project Planning , Scheduling & Material Planning

for Naitwar Mori HeP (2 x 30 MW)

SUBMITTED BY:

Kshitij Thakur

ICDEOL Roll No. 6872


2/39

2

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.


3/39

3

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)


4/39

4

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


5/39

5

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).


6/39

6

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.


7/39

7


8/39

8

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


9/39

9

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


10/39

10

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.


11/39

11

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.


12/39

12

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 .


13/39

13

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


14/39

14

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


15/39

15

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


16/39

16

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


17/39

17

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


18/39

18

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


19/39

19

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.


20/39

20

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


21/39

21


22/39

22

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


23/39

23

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


24/39

24

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


25/39

25

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%


26/39

26

0.60 No

Excavation in Rock

Excavation in rock 2740 cum


Time required for excavation in Rock 0.25



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


27/39

27

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


28/39

28

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


Empty haul @ 20 kmph 3 minutes



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


29/39

29


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


30/39

30

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


Available dry months 12 months



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


31/39

31

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


Empty haul @ 16 kmph 3.75 minutes



32/39

32


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


say 0.2


33/39

33

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:


34/39

34

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:


35/39

35

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


36/39

36

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 ---- ---- ----


37/39

37

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:


38/39

38


39/39

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.

MBA Summer Term Report

Documents

Transcript of MBA Summer Term Report