The Koyna Project is a feat of engineering expertise. A testimony to the untiring efforts of hundreds of workers and engineers, it stands tall & proud - a true symbol of development at it's best! salient features of "Koyna Project" stage IV executed by B.T. PATIL AND SONS BELGAUM (CONSTRUCTION) LIMITED, with an awareness of its immense potentialities for the development of Maharashtra and the Nation
| * Approach Tunnel to Power House | : |
Length Size Slope |
1094m 7m x 8.5 m 1:20 |
| * Ventilation Tunnel to Power House | : |
Length Size Slope |
760m 4m x 4m (630m) AND 6.5m x6.5m (130) 1:12 (inclined) |
| * Machine Hall Drift | : |
Length Size |
145m 6.5m x 6.5m |
| * Draft Tube Gate Gallary | : | Length | 109m |
| * Access Tunnel to D. T. Gate Gallary | : |
Length Size Slope |
294m 6.5m x 6.5m 1:22 (upward) |
| * Access Tunnel to Tail Surge | : |
Length Size Slope |
292m 6.5m x 6.5m 1:13 (inclined) |
| * Access Tunnel to Pressure Shaft | : |
Length Size Slope |
260m 6.5m x 6.5m 1:13 (inclined) |
| * Collection Gallary | : |
Length Size Slope |
187m 10m x 10m 1:74 (inclined) |
| * Tail Surge | : |
Length Size Slope |
240m 19m x 10m 1:1500 (downward) |
| * Inter Adit to Pressure Shaft & Connecting Gallary | : |
Length Size |
349 + 90m 6.5m x 6.5m |
| * Winch Cavern | : |
Length Size |
17m x 4 Nos. 4m x 4m |
| * Access Tunnel to E.V.T. | : |
Length Size |
330m 6.5m x 8m |
| * Bye Pass to Head Race Tunnel (Adit) | : |
Length Size Slope |
149m 6.5m x 6.5m |
| * Ghat Road Ch. 5400m to 6000m (Deep Rock Cutting) | : |
Length Size Slope |
600m |
| * Head Race Tunnel Through Construction Shaft. | : |
Length Size Slope |
500m horse shoe 9.5m height 9.5m width at spring Level, 7m width at invert |
| Lift for Muck through Shaft | 95m | ||
| * Emergency Valve Tunnel, Take Offs and Pressure Shafts 4 x 50m each | : |
Length Size |
100m 10m x 17m |
| * Tail Race Tunnel | : |
Length Size |
871m 10m x 10m |
| * Upderground Excavation for Transformer Hall Arch & Draft Tubes etc. | : |
Length of Arch Width Height |
160m 20m 10m. |
| * Providing Lining to Road Tunnel No. 1 at Panchdhara. | : |
Length Size |
540m 7.50m x 9.10m |
| * Emergency Valve Tunnel | : | Length |
21m Hight 10m Width |
| * Take Offs | : |
Length Size |
50.33m x 4 Nos. 3.90m |
| * Head Race Tunnet | : |
Length Size |
4230m width 10.45m at spring level &. 7.5m at Invert. |
|
Type Area |
horse shoe 90 Sq. m. |
||
| * Intake Tunnels | : | Length | 187.77m & 240.26m Two Hrs. |
| * Head Surge | : | Partial | |
| * Lake Tapping - Constructing Rock Bund | : | Partial | |
| * Intake Structure (Underground Works) | : | Partial | |
| QUANTITIES | |||
| Underground Tunnel Excavation Concrete Shotcrete Guniting Reinforcement |
: : : : : |
7,87,880 cum 1,29,500 cum 28,350 sq.m. 24,430 sq.m. 5,226 mt. |
|
| Financial Outlay | : | Rs. 1383 millions | |
| (Upgraded to 1999 Price Level) Period of Performance |
: | 1988 - 1998 | |
| The geology consists of 'Deccan Trap Basalt & Volcanic Breccia'. | |||
| The Excavation is being carried out by Conventional Drill & Blast method using Multi Deck Mobile Drilling Jumbo. | |||
| "NEW ALL INDIA RECORD" OF 168 m PER MONTH PER FACE CREATED DURING JANUARY 1993. | |||