1 overview
1. 1 project overview
The dam site of Tuwei Hydropower Station is located in the lower reaches of Tuwei River, a tributary of Jinjiang, and the power plant is located in the lower reaches of Jinjiang. It is under the jurisdiction of Chi Nan District of Changbai Mountain Management Committee of Jilin Province. Tuwei River is a first-class tributary on the right bank of Jinjiang, which only originates from the east and west sides of Manjiang Town in Fusong County and joins Jinjiang at Jinjiang Bridge in Manjiang Town in Fusong County. Spring water is developed in the basin, except for precipitation in flood season, the main source of water is upstream spring water supply. Tuweihe Hydropower Station has a grade of five and a building grade of five. The design flood standard of water retaining structures is P=5%, and the check flood standard is P = 1%. Power plant design flood standard P=5%, check flood standard P = 2%; Flood standard of energy dissipation and scour prevention structures P= 10%. It is mainly composed of overflow dam, diversion open channel, pressure forebay, pressure pipeline and power station. The reservoir has a storage capacity of 4.8× 104m3 and an installed capacity of 990kW. 1.2 River Basin Overview The dam site of Tuwei Hydropower Station is located in the lower reaches of Tuwei River, a tributary of Jinjiang River. The control basin area above the dam site is 37.9km2, the river length is 17.8km, and the average river ratio is reduced to 8.0‰. The workshop is located in the lower reaches of Jinjiang River, a tributary of Toudao Songhua River. The control basin above the plant site covers an area of 490km2, the river course is 60.2km long, and the average river course gradient is 1 1.5‰. Tuwei River is a first-class tributary on the right bank of Jinjiang River, which originates from the northeast of Manjiang Town in Fusong County and joins Jinjiang River at Jinjiang Bridge in Manjiang Town in Fusong County. The catchment area of the basin is 45.9km2, the length of the river channel is 20.8km, and the average gradient of the river channel is 7.2‰.
2 Geology
The bedrock of dam foundation is composed of pebbles, pebbles with cohesive soil and other loose layers, with a total thickness of 5.0m, under which is dense massive basalt. Quaternary loose body has large deformation and is not suitable for gravity dam foundation, so it is suggested to remove it all. If the dam foundation is located on dense massive basalt rock mass, its strength can meet the requirements, and there is no weak layer under it, so there is no settlement and stability problem of the dam foundation. No gently inclined joints are found in dense massive basalt, and there is no anti-sliding stability problem in dam foundation. The surface rock mass of dam foundation is a medium permeable layer, and there is leakage problem. The lithology of foundation pit is mostly strongly permeable pebbles and pebbles mixed with cohesive soil, and it is located by the river, and the groundwater recharge source is rich. Effective drainage measures should be taken to avoid quicksand and seepage stability problems. The bedrock properties of power plant buildings are pebbles from the surface down, with the thickness of clayey soil of 1.50 ~ 2.00 m, crushed stones, clayey soil of 1.50 ~ 2.50 m and dense massive basalt of 8.00 ~10.0 m. ..
3 main building layout
3. 1 general layout of the project
The main structures of Tuweihe Hydropower Station include overflow dam, diversion open channel, pressure forebay, pressure pipeline, power station and booster station. The total length of overflow dam is 24m；; The diversion open channel is located on the left bank of the river upstream of the retaining dam, with a total length of1248.37 m; The power station is located on the left bank of the river downstream of the dam, and the booster station is located on the left side of the power station.
3.2 Design of retaining dam
The retaining dam is a concrete overflow dam with a total length of 24m, an elevation of 858.00m, a foundation elevation of 854.50m and a maximum dam height of 3.5m The upstream dam slope is vertical, the downstream dam slope is 1:0.6, and the access road is arranged on the left side of the river.
3.3 Design of diversion open channel
The total length of diversion open channel is 1248.37m, and the diversion flow is 2.5m3/s. The whole section is lined with dry masonry, with two layers of anti-seepage and one membrane. Open channel bottom slope11500, bottom elevation 856.50m ~ 856. 16m, bottom width 2m, slope 1: 1.5.
3.4 Design of pressure forebay
The pressure forebay is located at the end of the diversion channel, with a maximum water depth of 3.97m and a bottom elevation of 854.96m, and is connected with the upstream diversion channel through a variable bottom slope of 1:5. The forebay has a clear width of 3.5m, and is a whole U-shaped groove structure. At the end of the pressure forebay, there is a pressure pipe intake sluice with a design flow of 2.5m3/s, and the structural type is orifice plate, which consists of a sluice chamber section and a gradual change section. The lock chamber is 5.75m long, the bottom plate of the lock chamber is 1.2m thick, and the side pier is 1.5m thick. The floor elevation of the gate is 854.96m, 1 hole, and the orifice size is1.2m×1.2m. The trash rack and emergency maintenance gate are set at the entrance, and the corresponding hoist equipment is electric hoist and hoist. The upper part of the lock chamber section is respectively provided with a maintenance platform and a hoist platform, the elevations of which are 858.93m and 862.63m respectively, and the foundation of the lock chamber is pebble cohesive soil. After calculation, the anti-sliding stability and foundation bearing capacity meet the requirements of the code. The gradual change section is 3.0m long, mainly because the entrance of the intake sluice gradually changes from a square hole to a round hole and is connected with the pressure pipeline.
3.5 Pressure pipeline design
The intake sluice of the pressure forebay is connected with a pressure pipeline, which is made of steel pipe with an inner diameter of 1200mm, a wall thickness of 16mm and a total length of 331.29m..
3.6 Power Plant Design
Power plant is mainly composed of main plant and auxiliary plant. The workshop is located on the left bank of the downstream river of the dam, about 1.6km away from the dam area. The lowest tailwater level of the powerhouse is 806.60m m. The main powerhouse is a ground powerhouse, located on the basalt of the blowhole, with a length of 18.98m and a width of 12.8m, which is divided into two parts: the main engine room and the installation room. The elevation of the generator floor between the main engines is 805. 10m, and there are generator sets inside, with a single machine capacity of 990KW and a total installed capacity of 990KW. The clear width of the center line of the generator set is 6m on the upstream side, 5m on the downstream side and 1 1m on the workshop. The installation room is located on the right side of the main engine room, with the same width as the main engine room, and the ground elevation is 810.00 m. The elevation of the draft tube bottom plate on the downstream side of the main engine room is 801.30m. The draft tube is followed by a straight section, followed by a reverse slope section with a bottom slope of 1: 4, and the trapezoidal draft tube auxiliary building with a bottom width of 2.6m and a slope of 655 is located. Length 19.9m, width 12.8m, roof elevation 8 14.50m, floor elevation 8 10.00m, and floor thickness 0.25m.
I believe that after the above introduction, everyone has a certain understanding of the engineering design summary of Hehe Hydropower Station. Welcome to Zhong Da for more information.
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