Source: Sinohydro Bureau 11 Author: Yang Zhenhua
Recently, the Tana Lake Hydropower Station Project in Nepal has successively achieved the goal of connecting the diversion tunnel construction adit and penstock construction adit.
The total length of the construction adit of the headrace tunnel is 356m, the net size of the tunnel is 7m wide and 7m high, and the excavation volume is 17600 m3. As the traffic tunnel of the headrace tunnel and the construction adit at the top of the pressure shaft, the headrace tunnel construction adit is the construction channel for the excavation and lining of the headrace tunnel, the excavation of the construction adit at the top of the pressure shaft, the excavation of the pressure shaft, the installation and pouring of the penstock. In the later stage, it will be used as a construction road to enter the adit of the pressure shaft manhole.
The total length of the penstock construction adit is 218m, the net section of the tunnel is 7m wide and 7m high, and the excavation volume is 11000 m3. As the construction channel at the bottom of the pressure shaft, the penstock construction adit will be used as the construction channel for the excavation, penstock installation and lining of the lower flat section and bifurcated section of the pressure shaft, as well as the slag discharge channel of the shaft section.
In order to ensure high-quality performance and smooth connection of double tunnels, the project department continuously optimizes the excavation scheme and support parameters, and strictly controls the safety and quality. All departments cooperate closely, fully analyze the work difficulties before construction, formulate emergency plans for potential adverse factors, orderly promote the construction progress according to the requirements of tunnel engineering specifications, strictly implement the epidemic prevention system, make every effort to overcome the impact of epidemic, restore production and living order, and ensure that on the premise of implementing the normalization requirements of epidemic prevention and control, Promote project production, operation and construction.
Next, all members of the project department will take the opportunity of double hole connection to continue to carefully organize the construction to ensure the completion of annual tasks and objectives.