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西四环暗涵是穿越北京市城区的大型建筑物,上接卢沟桥暗渠,下接团城湖明渠,为总干渠的最后控制性工程,全长12.64km。暗涵进口位于丰台区大井村西京石高速路永定路立交桥西南角,穿越永定路及京石高速路后沿高速路北侧向东北约1.4km由岳各庄桥进入四环路下,沿四环路向北约11km在四海桥处离开四环路北行约500m与团城湖明渠相接。工程由1397m长2-3.8m×3.8m明挖施工方涵、185m长2孔3.8m×3.8m暗挖施工方涵、10959m长2-Φ4.0m浅埋暗挖圆涵及出口闸4部分组成。
The Nansihuan Hanyu is a large-scale building that crosses the urban area of Beijing. It is connected with the Lugouqiao underdrain and the Tuanchenghu open channel under the control of the project. It is the last controlled project of the main canal with a total length of 12.64km. The culvert entrance is located in Fengtai District Dajingcun Xijing Stone Highway Yongding Road overpass southwest corner of the Yongding Road and Beijing-Shijiazhuang Expressway north along the highway north-east about 1.4km from Yuege Zhuang Bridge into the Fourth Ring Road, along the four About 11km north of the loop, leave the Fourth Ring Road at Sihai Bridge about 500m north and connect with Tacheng Lake Open Channel. The project consists of a 1397m long 2-3.8m × 3.8m open excavation square culvert, a 185m long 2-hole 3.8m × 3.8m undercut excavation square culvert, a 10959m long 2-Φ4.0m shallow buried excavation culvert and an exit gate of 4 sections composition.