大口径输水管道的止推设计

广州市西江引水工程是广州市的生命线工程,其管径大、压力高,且双管同槽敷设。主管材采用预应力钢筒混凝土管(PCCP),由于弯头处双管推力很大,使得弯头处的止推设计成为保证整个输水系统安全的关键因素,也是工程设计的重点和难点之一。对几种常用的止推形式进行分析,并针对西江引水工程推力大、用地紧张、工期短等具体情况,最终确定了钢管外包混凝土的止推形式。对该种止推形式的设计进行了介绍,可供类似工程参考。

Discussion on Thrust Design of Large Diameter Water Transmission Pipeline

Xijiang River water diversion project is the lifeline project in Guangzhou City.The project has big pipeline diameter,high pressure and two pipes are laid in the same trench.The main pipe material is prestressed concrete cylinder pipe(PCCP).Because of the big push force at the elbow of two pipes,the thrust design is the key factor ensuring the safety of the whole system,and also one of the emphases and difficulties in the project design.Based on the specific circumstances of Xijiang River water diversion project,such as the big push force,land shortage,short construction period and so on,the thrust form of steel pipe packed by concrete is chosen.The design of the thrust form is introduced to provide reference for the similar projects.