Table 2: Civil works (arch dam, underground powerhouse etc.) – Lot 1B/2/3
Arch dam – Features |
Dimension/Quantity |
Unit |
Height |
188 |
m |
Crest length |
420 |
m |
Crest elevation |
1,145 |
m |
Maximum thickness at base |
28 |
m |
Thickness at crest |
5.6 |
m |
Low level outlet radial gates – 4 No. at el. 1,057m |
8.0 x 5.6 |
m |
Open excavation |
310,700 |
m3 |
Underground excavation |
14,800 |
m3 |
Concrete (mass and structural) |
1,034,000 |
m3 |
Unit Cost of Concrete (incl. cement, not forms) |
$100.24 |
USD |
Reinforcing steel |
7,000 |
tonnes |
Embedded cooling pipes |
204,000 |
m |
Concrete placement period |
36 |
months |
Maximum concrete placement rate |
46,800 |
m3/month |
Average concrete placement rate |
28,700 |
m3/month |
Cement Content (Dam mix including pozolans) |
240 |
kg/ m3 |
Average dam concrete strength (150mm maximum aggregate mix – 97% std. dev.) |
30.2 |
Mpa |
Power Complex – Features |
Dimension/Quantity |
Unit |
Intake structure height |
75 |
m |
Upper headrace tunnel, 7.25m lined diameter |
320 |
m |
Vertical shaft, 6.75m lined diameter |
120 |
m |
Lower tunnel 6.75m reducing to 4 – 4.0m steel lined penstocks |
408 |
m |
Powerhouse cavern |
95lg x 18w x 38h |
m |
Tailrace tunnels, 4 No. x 5m diameter x 73m long |
292 |
m |
Francis Turbines |
4 |
ea |
Plant Maximum Flow |
220 |
m3/sec |
Unit Design Head |
155 |
m |
River Diversion Works – Features |
Dimension/Quantity |
Unit |
Diversion Tunnel No.1 – invert lined, dia. 7.8m |
430 |
m |
Diversion Tunnel No.2 – fully lined, diameter 7.0m |
370 |
m |
Upstream cofferdam – Mass concrete |
|
|
Crest length |
75 |
m |
Top elevation |
978.5 |
m |
Height |
18.5 |
m |
Concrete Volume |
10,443 |
m3 |
Tunnel No. 2- Duel High Pressure Bonneted Slide gates |
2.54w x 2.67h |
m |