Layout of Wanjiazhai Hydropower Station Hub

Wanjiazhai Hydropower Station consists of barrage, spillway structure, diversion structure, powerhouse behind dam and switching station. The middle hole is a drainage hole for short-tube pressureless dam body, which is arranged in No.9 and 10 dam sections in the middle of the river bed, with 2 holes in each dam section, the orifice size is 4m× 8m, and the elevation of the inlet bottom beam is 946m. Operated by flat doors, it is mainly used for flood discharge, sand discharge and discharge. At the end, the energy is dissipated by bucket flow, and the total discharge is 2 1.56 cubic meters per second.

The surface hole is an open overflow weir, which is arranged at No.4 dam section on the left. The clear width of the orifice is 14m, and the elevation of the weir crest is 970m, which undertakes the task of flood discharge. When the water level of the reservoir is 980m, the flow rate is 864m3/s ... The dredging hole is a pressure pipe in the dam, which is arranged at the right side of the river bed 13 ~ 17 dam section, below the water inlet of the power station, and the elevation of the inlet bottom beam is 9 12m. The cross section of the inlet is 2.4m× 3.0m, and it is equipped with plane access doors and emergency doors, which are mainly used to reduce the sediment entering the power station.

The elevation of the water inlet of the power plant is 932m, and the diameter of the steel pipe is 7.5m. The main workshop is196.5m long, 27m wide (upper part), 43.75m high (lower part) and 56.3m high. It is a power station behind the dam. It is equipped with six hydro-generator sets, with a single capacity of1.8000 kw, a rated head of 68m, a maximum head of 8 1.5m and a minimum head of 51.3m. The switch stations are arranged between the platforms of the dam. The main project of Wanjiazhai Hydropower Station: earthwork excavation is 6.5438+0.33 million cubic meters, stone filling is 6.5438+0.85 million cubic meters and concrete and reinforced concrete are 6.5438+0.8 million cubic meters.

Split-flow mode is adopted in stages. In the first stage, the left bank 1 ~ 1 1 dam section was reclaimed. Under the protection of the first-stage low cofferdam, five 9.5m× 9m temporary diversion bottom holes will be set in the 6 ~ 10 dam section to create diversion conditions for the second-stage closure. By the end of June 1995 1 1, the left bank dam section had diversion conditions. 165438+1The pre-occupation of the closure dike began in late October, accounting for 35 meters of the dike length. The designed discharge of river closure is 9 1.7m 3/s, the corresponding water level in front of the weir is 904.7 m, the crest elevation is 906 m, the maximum flow rate of river closure is 7.4 m/s, and the maximum drop is 5.3m. In the process of river closure, the measured maximum flow rate of river channel is 5 1 m3/s, and the maximum flow rate of Longkou is 6.75m3. * * * Cutting materials: 88 concrete tetrahedrons 15 ~ 18 tons, lead wire cages 1586 cubic meters, 24,000 cubic meters of stones, and 0/600 cubic meters of stone strings.

The left dam head of the main concrete system is arranged at the elevation of 10 10 meter, and two 4×3 cubic meters concrete mixers are installed. The auxiliary concrete system is arranged on the right bank with a production capacity of 105 m3/ day. The land requisition in the construction area of Wanjiazhai Water Control Project is 6583 mu, including 29 15 mu of cultivated land, which was completed before 1997. The reservoir area is flooded with 70 natural villages in Qingshuihe County, Zhungeer Banner, Inner Mongolia Autonomous Region and Pianguan County 10 township (town), Shanxi Province. The land in the reservoir area is 184 14 mu, which inundates 3698 rural people, houses of various types, brick kilns 123800 m2, and 7 large-scale special projects. The migration in the reservoir area began at 1994 and ended at 1998. Land requisition procedures have been handled in accordance with relevant state regulations. There are 500 people in the construction area and 5094 people in the reservoir area. After the implementation, the satisfaction rate of immigrants in the construction area and the reservoir area to the production and living resettlement is over 90%. The relocation of seven special facilities started at 1997 and was completed in 2000, restoring the original functions. The cleaning of the bottom of the reservoir passed the acceptance in September. 1998.