Insulation Puf - First Time in India

Hcc Executes first time the installation of Insulation Panel to maintain the concrete temperature. This has been done first time in India used in Highest altitude Gravity Dam constructed by Hindustan Construction Co. Ltd.
Profile Panel: providing and fixing prefabricated PUF sandwitch profile panel comprising of two sides facing of coloue coated Galvanized steel sheets and sandwitched between them CFC free close cell high density rigid polyurethane foam 40+-2 kg/cu.m having a thermal conductivity value of 0.023w/mk at 10 deg cel temperature. The outer sheet shall be profile steel sheet of 0.5mm TCT (total coated thickness). The profile depth should be 28-30mm at a pitch 195-200mm. The inner sheet shall be in the form of tray, having small notches in between. The outer profile sheet and the inner liner tray shall have 50mm thick average polyurethane foam insulation. The panel should be of required length and width with male and female edges on the sides. The prefabricated panel shall be fixed through the profiles directly to the purlins using seld drilling fastners with neoprene washers mechanically with the help of machine. Load span table for profile panel is as follows:
Thickness span 2.00m 2.50m 3.0m 3.50m
50mm 267/380kg/sq.m 175/249kg/sq.m 125/178kg/sq.m 92/131kg/sq.m

Above are safe loads in kg/sq.m UDL (single/multiple span) with deflection criteria of L/240; for wind loads a factor of 1.33 is applied to above.

For further knowledge plz contact mkshccindia@yahoo.com

Descriptive Study of Nimoo-Bazgo Hydro Electric Project-HCC Vision

NEWS

Nimoo-Bazgo Hydro Electric Project:
HCC executes some of the exciting projects in India. These include some of the most challenging projects like Nimoo-Bazgo Hydro Electric project. NBHEP under the ambitious National Hydro electric project ltd. is a run of the river scheme proposes to harness the harness the hydropower potential of River Indus in Leh district of Jammu & Kashmir. The project envisages utilizing a rated net head of 34m to generate 239.30 GWH in a 90% of dependable year with an installed capacity of 45 MW, three turbines of 15MW each. This is equivalent to a plant load factor or capacity factor of 60.7%. Each operating unit will designed for a discharge of 48.7 cub.mtr.per second.
The project will be connected to the Northern Grid through a 220kv transmission line from Leh to Srinagar.
The project will be implemented under International competitive bidding by splitting the work into the three contact packages:
LOT1: Civil Works, including Diversion Channel, Concrete Dam and Spillway, Intake structures, penstock, Surface power House, Tail Race channel, Switch yard and other associated works.
LOT2: Hydro-Mechanical Works including all gates and penstock
LOT3: Electro-Mechanical works.

The project involves the construction of:
Diversion Channel: 372m long & 20m wide at bottom for diversion flood of 2060 cumec.
Coffer Dam: 2 nos. Upstream & Downstream
Concrete Dam:
Concrete Gravity Dam ( 57m high from deepest foundation level & 247.90m long at the top)
Spillway Blocks
05 Nos. Spillway blocks=13 m each (orifice type with breast wall in central portion)
Non-overflow Blocks
05 Nos., Length=69.45m (on left Bank)
Power Dam Blocks
03 Nos., Length=52.75m (on right Bank adjacent to Spillway blocks)
Non-overflow Blocks
05 Nos., Length=60.70m (on right Bank)
Penstock
• 3 Nos. Steel circular Penstocks, Size=3.30m dia. Length=63m. each
Penstock Intakes
3 Nos. Penstock intake (2.59mX3.30m) in power dam block.
Surface Power House
Machine Hall = 45.75m X 19m.
Service bay = 21.75m X 19m.
Location = On right bank at Dam toe.
Tail Race Tunnel
Open Tail race channel of about 50m length
Transformer Deck
Transformer yard on control room roof.
Switchyard
Size: 100m. x 55m.

Description of Project Components:

DAM:
A 57m high concrete gravity dam across the river River Indus with dam top at El. 3094m is provided above the deepest foundation level and consists of five spillway blocks of 13.0m each in the central portion, 5nos. non-overflow blocks on the left bank of 69.45m length, 3nos. power dam block on the right bank having lengths of 52.75m adjacent to spillway blocks. Right Non-overflow blocks comprises of four blocks having length of 60.70m. There are 5nos. radial gates of size 7.0*9.0m with crest level at 3065.0m.

The overflow section has been shaped as per the ogee profile with crest EL. At 3065.0m. The foundation cum drainage gallery of 2.0*3.0m size us provided in the dam body.
SPILLWAY:
The spillway is designed for flood equal to 4500 cumec with the reservoir at EL.3093.0m to pass design discharge with one way inoperative. The spillway is 65.0m long having 35m clear waterway with 6m thick intermediate twin piers and 3m thick end piers. The discharge intensity through spillway with u/s water level at FRL is 128.5cumec/m length of the crest. Considering the d/s tail water level, the topography and economy flip bucket type energy dissipater has been provided. A 15m wide apron is provided at dam foundation level to protect it from possible scouring.

Diversion Channel:

A trapezoidal channel with the base width of 20m has been proposed to divert the diversion flood of 2060cumec. The length of the channel is about 372m. The bed and the sides of the channel shall be lined upto1.0m above the water level in the channel. Bed level of channel at inlet and outlet has been kept as EL. 3055.0m and 3053.5m respectively.
Cofferdams:
Two cofferdams of upstream and downstream of the dam is provided.
Upstream Cofferdam:
Top level of the U/S cofferdam proposed at El. 3069.5m with a free board of 1.5m. The cofferdam has been placed so as to keep its axis at 67.0m from the axis of the main dam.

Down stream cofferdam:
The distance between the dam axis and the axis of the d/s cofferdam has been kept at El.3062.0m.

Intake:

3nos. independent intakes are located in the power dam blocks on the right side adjacent to the spillway blocks. Trash rock arrangement has been kept in front of intake to take care of entry of floating debris. Suitable bell-mouth entry is provided at entrance of each intake
Penstock:
Three nos. of steel penstocks of 3.3m dia take off from intake and run parallel to downstream slope of the dam before taking a bend near power house to feed three units of 15MW each.
Power House:
The surface power house is located on the right bank of the dam toe. The power House will have an installed capacity of 45Mw comprising 3units of 15MW each. It has vertical Francis turbine. Elevations of important component are given below:
Central line of turbine: El. 3049.0m
M/c Hall floor level: El. 3060.0m
Service Bay Level : El. 3065.0m
EOT Crane beam level: El. 3076.0m
Power House Protection wall
A cellular wall has provided to separate the powerhouse and spillway block. The top of the protection wall up to the A-line has been kept at EL 3065 M. Beyond this, the top level is at EL 3059 M, which corresponds to tail water level for a discharge of 1000 cumec. A 5 M deep reinforced concrete cut off wall on the river side of this wall has been provided.

Tail Race Channel:
The water from the power House shall be laid by an open channel of about 50m length to join the river.
Transformer Deck
The single phase transformers will be located u/s of machine hall on the control room roof. The transformers are located at EL. 3065 M same as service bay level.
Switch Yard:
The 33kv switch yard located at El. 3096.0m just u/s of the dam. The size of the proposed switchyard is 100m*55m. A cable trench of size 3m*2.5m connecting the transformer yard to the switch yard has been provided.
Insulation Puf:
Prefab. Puf for covering of concrete structure has been done first time in India to prevent the structure from the cold climatic condition. Prefab. Puf sandwiched panel 31mm thick prefabricated puf a sandwich profile panel comprising of two sides facing of colour coated Galvanized steel sheets and sandwiched between them CFC free close cell high density rigid polyurethane foam 40+2kg/cu.m having a thermal conductivity value of 0.023w/mk at `10 deg centigrade mean temperature. The outer sheet shall be profiled steel sheet of0.5mm TCT (Total coated thickness). The inner sheet shall be in the foam of a tray, having small notches in between.

Civil Engineering

Hi Im mukesh Saini Works Manager any buddy can ask me d related quest on hydro powers based on civil ield.