New type of multi-level water intake device of reservoir in underwater construction

In the light of the difficulty that the reservoir using deep hole as water intake is hard to be reconstructed into multi-level one,a new economic and feasible method is proposed,using a multi-level water intake device of erect steel pipe in case of underwater operation.The new device links the intakes at different elevations with erect steel pipes and tee pipes,of which the steel pipe encircled by holt hoop iron is fixed into the concrete dam.At the bottom of erect pipes,a level pipe which would be entered into the original intake pipe is linked to the erect pipes by a tee pipe and fixed by underwater concrete construction.Each intake is equipped with a flap and controlled by the hoist on the dam crest,taking water from multi-level as needed.The components of the device are assembled on land,and installed by diver′s underwater operation.The device has the advantages of simpler construction and less investment,providing an effective way to ensure the water quality in deep intake without emptying the reservoir.