At last the first shore spillway unit of Sayano-Shushenskaya HPP is being launched! Here are some photos of the structure.
A grandiose view of the shore spillway. The structure contains an intake portal, two free-flow downstream tunnels with section 10x12m, an outlet portal, a five-phase fall and an offtake channel.
The ground over the intake portal
The intake portal serves for the gradual intake of water into two free-flow downstream tunnels each 1130m long, full-capacity discharge of each tunnel is 2000m3/s of water.
Relief tunnels along the full length and perimeter are consolidated with a trough-shaped monolithic reinforced concrete encasement. Water flow speed at the outlet – 22m/s, operational mode of the tunnels – the free-flow one. On the picture – a segmental gate and its chamber.
The five-phase fall represents five dissipation wells 100m wide and 55-167m long, separated by overflow spillways. The fall will provide dissipation of the flow energy and smooth conjugation with the stream canal.
Maximum speed of water flow at the input to the upper well reaches 30m/s then it decreases to 4-5m/s. The offtake channel 100m wide on the bottom and 700m long endwise provides
conjugation of the discharged flow with the stream canal.
The extent of work is rather impressive!
Black holes under the aprons are aeration pipes for air intake to the water flow. Aeration softens water impact on the surface of the concrete. Thus, between the water and the concrete an air cushion is formed.
The manifolds are 5 m high.