Pccp pipeline construction organization design document
The Middle Route Project of South to North Water Transfer starts from Danjiangkou Reservoir in Hubei, and enters Beijing through Hubei, Henan, Hebei and other provinces and cities. The main canal in Beijing section connects with the open canal section of Hebei Province from the south of the middle branch of the North Juma River, passes through the canal head intake gate, enters the underground canal of the North Juma River, reaches the Huinanzhuang pump station, raises water through the booster pump, and transfers water to the Daning surge tank through the PCCP water transmission pipeline. After Daning surge tank, low pressure concealed pipes are used for gravity water conveyance, passing through Yongding River inverted siphon, Lugouqiao low pressure concealed box, west fourth ring low pressure concealed box, and finally from Tuancheng Lake open channel to Tuancheng Lake, the destination, with a total length of 80km. The PCCP pipeline project is a large-scale water transmission project with the longest main canal line in Beijing section of the middle route of the South to North Water Transfer Project, which is connected to Huinanzhuang pump station on the top and Daning surge tank on the bottom. The starting point of the water transmission pipeline is 2.3km away from the canal head, and the end of the water transmission pipeline is about 21.4km away from the end of the main canal Tuancheng Lake in the Summer Palace. The total length of PCCP water transmission trunk line is 56.359km (including two tunnels, Xiganchi Tunnel and Chongqing Tunnel), which are two rows of PCCP pipes with a diameter of 4m. The PCCP water transmission pipeline project in Huinanzhuang Daning section is a Class I project, and the main buildings are Class 1 buildings. Taking HD41+000 as the boundary, the design seismic intensity of HD0+000 ~ HD41+000 is 7 degrees, and the design seismic intensity of HD41+000 ~ HD56+359.296 is 8 degrees. The design flow of pressurized water conveyance of the main water conveyance line is 50m3/s, the increased design flow is 60m3/s, and the gravity water conveyance flow is 20m3/s. The operation mode of the water transmission trunk line project of Huinanzhuang Daning section water transmission trunk line is: when the flow Q ≤ 20m3/s, the water is transported automatically; When the flow Q>20m3/s, pressurize the water from Huinanzhuang pump station to Daning surge tank. The PCCP pipeline project consists of two rows of 4.0m diameter PCCP pressure pipes (each pipe weighs 54~77t, the maximum outer diameter of the pipe is 4852mm), four water distribution buildings, three connecting buildings, 101 exhaust valve well buildings, 19 exhaust valve well buildings, one end control valve well building, two tunnel crossing buildings, four railway crossing buildings, 17 major highway crossing buildings 27 river protection works, permanent patrol lines and buildings passing through patrol lines. It is divided into six sections. This bid section is the first bid for civil installation of PCCP pipeline project in Huinanzhuang Daning section. The starting stake number of water transmission trunk line in this section is DH0+000~DH12+300, with a total length of 12.3km. There are 23 vent valve buildings, 5 vent valve buildings, 1 connecting building, 7 river crossings, 2 highway crossings and other buildings along the PCCP pipeline. The construction period of the project is 23 months. The elevation system used in this project is the Beijing local elevation system, and the conversion relationship with the 1985 national elevation system is: Beijing local elevation datum=1985 national elevation datum+0.426; All coordinate systems adopt Beijing local coordinate system.