Study On Water Seal Layout At The Power House Monolith Joint Of Power Station In River Channel

In general, the head pressure of power station in river channel is lower comparatively, but the unit discharge is always greater, in this way, the dimension of the hydropower house is usually larger. The mill construction is composed of retaining wall in upstream, flow passage, retaining wall in downstream, sand sluice, superstructure and substructure of main generator room, which is a 3D cavity structure. As water retaining structure, the upstream face and downstream face are direct-contacted with water, formed a heavenward face, bearing horizontal applied force of upstream and downstream, lead to the distribution of inner force is more complex than other type power house. The main parts of mill construction all are in high stress state such as pier, spiral case, draft tube etc. Reasonable water seal layout is beneficial for releasing stress state of those parts. Until the present time, there is no uniform regulation about water seal layout of power station in river channel. There is no report and study about this aspect, both here and abroad. The lay lout always based on engineering experience. Setting out the reasonable water seal layout on paper by computation is very necessary.With reference to the engineering project, in this paper, mainly study on water seal layout of power station in river channel, the 3-D finite element model is boiled and static and dynamic stress were calculated, contrasted stress distribution of differ water seal layout Setting out the reasonable water seal layout, offer reference for engineering design and save the investment.By computational analysis gotten out: the reasonable water seal layout is efficiency for modify the stress state of water inlet, pier, spiral case, draft tube, tail water outlet, etc. Satisfied operating requirement and other design specification, the water seal in upstream should be moved to downstream and the water seal in downstream should be moved to upstream as so far as possible, the level water seal should be drive up proper, lead to balance between inside and outside of channel. Because of water seal layout in the two transverse joint of power house monolith are different, the surface of water filled is different so, the water pressure is not balance, always lead to the whole power house monolith subjected to torsion, so the stress of corner brim at water inlet and tail water outlet is greater, thus, should adjust the water seal layout in the two transverse joint, making the water pressure approximate equilibrium in both side, that can modify the stress state effective. For the larger unit capacity power station, the water seal layout in joint should carry out dynamic stress check computation, can't just consider for static stress aspect.