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北京市第九水厂由密云水库取水,日供水能力100万t,是北京市最大的供水厂。其首都工程——密云水库九松山引水隧洞,全长3097m,洞径3.5m,隧洞包括:进口岩塞及缓冲坑段,距进口184m处装有7.4m×3.7m、高49.3m动水闸门的闸门井,离出口155m有直径2.5m、长80m支洞以及支洞出口闸门室和退水渠等,隧洞出口埋设钢管与取水站连接。
The No.9 Waterworks in Beijing takes water from Miyun Reservoir, with daily water supply capacity of 1 million tons and is the largest water supply plant in Beijing. The capital project - Miyun Reservoir Jiu Songshan diversion tunnel, a total length of 3097m, a diameter of 3.5m, the tunnel includes: imported rock plug and buffer pit, from the inlet 184m Department with 7.4m × 3.7m, 49.3m high dynamic sluice gate Of the gate wells, 155m from the exit diameter 2.5m, 80m long branch hole and branch hole exit gatehouses and back drains, etc., the tunnel exit buried steel pipe and water station connection.