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SALIENT TECHNICAL FEATURES OF HEAD RACE TUNNEL (BALANCE WORK) PACKAGE FOR TAPOVAN VISHNUGAD HYDRO ELECTRIC POWER PROJECT (4X130 MW)

“Salient Technical Features of the equipment/systems/services covered in NIT No. CS-5505-908(R1)-2 dated 15.05.2014 are mentioned below. These Salient Technical Features are mentioned only to facilitate the prospective bidders to prima-facie understand the requirements under the tender and shall not in any way limit or alter the scope of work and technical features/specification of equipment/ systems/ services covered in the Bidding Documents. Detailed provisions in regard of scope of work and technical features/ specification of equipment/ systems/ services, contained in the Bidding Documents shall be final and binding.”

SALIENT TECHNICAL FEATURES

LOCATION

a)		State			-	Uttarakhand
a)

b)		District			-	Chamoli
b)

c)		Tehsil			-	Joshimath
c)

d)		Latitude & Longitude at barrage			-	Latitude : N 30 29 30
d)						Longitude : E 79 37 30
e)		River			-	Dhauliganga (Tributary of Alaknanda)
e)


HEAD RACE TUNNEL
a)	Length and shape				-	12.087 km, Horse shoe/ Circular
a)

b)	Diameter				-	5.64 m
b)

c)	Design discharge				-	122.18 cumecs
c)

d)	Velocity				-	4.96 m/sec
d)

e)	Number of intermediate adits				-	3
e)

PRESENT STATUS OF HEAD RACE TUNNEL PACKAGE WORKS

Sl.				Description of work		Present Status
No.				Description of work		Present Status
No.
1			Excavation of Intake adit			Completed

2			Excavation of TBM Entry Adit			Completed

3			Excavation of Branch Adit			Completed

4			Excavation of TBM Exit Adit (Charmi			193m left
			adit)

Sl.	Description of work		Present Status
No.	Description of work		Present Status
No.
5	Excavation of HRT by Drill and Blast		HRT excavation from RD 14.5m to
	Method		1911.5m has been carried out from intake
			adit.
			HRT excavation from RD 2798m to
			2939m has been carried out from Branch
			Adit
		HRT Excavation from RD 11914m to RD
			12087 has been carried out from surge
			shaft adit.
6	Tunnel Concrete lining works in Drill	Overt lining works carried out from RD
	and Blast Portion of HRT		23m to RD 207m and RD 218m to 230m
			in HRT U/s of Intake adit.
		About 72m overt lining has been carried
			out from surge shaft end.
7	Excavation of HRT by TBM	Excavation of HRT by TBM has been carried
		out from RD 11914m to RD 6482m (5432m),
		precast lining has also been erected in this
		reach.
8	Present status of TBM	Presently TBM is standing in an area having
		multiple weak zones. A top heading has been
		created above TBM from 9 O’clock to 3
		O’clock.