Parts of the works of Middle Marsyangdi Hydroelectric Project
Middle Marsyangdi Hydro Electric Project is the Nepal's second largest hydroelectric project. This is a run-off-river hydro project with installed capacity of 70 MW.
Himal Hydro, a leading construction company in Nepal, is playing a major role in the construction of the project. It is the only home company with the necessary expertise and equipment to engage in a major project like this one.
The company involved in the underground and surface drilling works, open excavation, rock anchor and grouting at dam site of the project. The company undertook fully mechanized excavation and support work for the power tunnel, bypass tunnel, ventilation tunnel and surge shaft. The lengths of the tunnels range from 110 to 430 m and their areas vary from 15 to 44 m2.
The surge shaft excavated by Himal Hydro is the largest underground shaft in Nepal. It is 22 m in diameter and 53.5 m high. Alimak Raise climber was used for excavation of the pilot shaft from the bottom to the top and the widening of the shaft was done from the top to the bottom dropping excavated material through the pilot shaft.
Borehole Drilling at Headworks
| Project | Middle Marsyangdi Hydroelectric Project |
| Works | Borehole Drilling at Headworks |
| Borehole diameter | 48 to 89 mm |
| Depth | 5 to 30m |
| Cost of Work | NRs 12.4 Million |
| Period | 19 November 19, 2002 - October 9, 2003 |
Excavation and Support Work of the Ventilation Tunnel
| Project | Middle Marsyangdi Hydroelectric Project |
| Works | Excavation and Support Work of the Ventilation Tunnel |
| Length | 230 m |
| Size and Type of Tunnel | D shaped, 3.5 x 3.7 m |
| Cost of Work | NRs 13.4 Million |
| Period | April 8, 2006 - August 16, 2003 |
Surge Tank Excavation and Support
| Project | Middle Marsyangdi Hydroelectric Project |
| Works | Surge Tank Excavation and Support |
| Length/Depth | 53.5 m |
| Diameter | 22 m |
| Cost of Work | NRs 56 Million |
| Period | March 1, 2005 - February 2006 |
Penstock Tunnel Excavation and Support Work
| Project | Middle Marsyangdi Hydroelectric Project |
| Works | Penstock Tunnel Excavation and Support Work |
| Size and Type of Tunnel | horse-shoe shaped, 90m long, cross section area 44sqm |
| Cost of Work | NRs 73.2 Million |
| Period | July 19, 2005 - April 2006 |
Excavation and Support of Power Tunnel and Surge Tank Bypass Tunnel
| Project | Middle Marsyangdi Hydroelectric Project |
| Works | Excavation and Support of Power Tunnel and Surge Tank bypass Tunnel |
| Power Tunnel | horseshoe shape, dia 6.2 m, Length 296 m |
| Surge Tank Bypass Tunnel | U shape, 5.4 m wide and 5.7 m high, Length 109 m |
| Cost of Work | NRs 61 Million |
| Period | July 19, 2005 - April 2006 |
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