Key Techniques of Placing PCCP of Yumenkou Eastern Extension Project to Pass Fen River

The pipe line of Yunmenkou Eastern Extension Project pass Fen River in Xiangfen County.The water diversion pipe is PCCP of 2m in diameter.Constructing this works is very difficult.On the basis of understanding hydrogeologic condition in situ,and starting from design and construction angles,the paper expounds the key technique problems of passing Fen River including: narrowing river channel,stage construction diversion,excavating approach channel,construction of cofferdam and drilling drainage wells in foundation pit etc.