盘石头水库施工交通桥软弱地基处理措施

Soft foundation treatment measures at construction access bridge at Panshitou reservoir

沉井施工技术在工业与民用建筑、公路、桥梁等专业的应用较为广泛,在水利水电施工中较为少见。引用沉井施工技术,对盘石头水库泄洪(兼导流)洞工程施工交通桥桥基软弱地基进行了处理:①解决了河滩料严重渗水问题,避免了水流对桥墩基础的冲刷;②提高了桥墩基础的承载能力,保证了施工交通桥的运行安全;③降低了工程的施工难度,减少了施工工程量,节约了施工成本,加快了工程的施工进度,促进了盘石头水库的全面建设。

Open caisson well construction technology is widely used in industrial and civil structures, highways, bridges etc., but comparably less in water conservancy and hydropower project. The open caisson technology was used in soft foundation treatment of construction access bridge of flood release tunnel (concurrently used as river diversion) at Panshitou reservoir and the following problems were solved. ① Serious water seepage problem was solved and the scouring of flow to bridge pier foundation was avoided; ② The loading capacity of the bridge pier was increased and the safe operation of the construction access bridge was guaranteed; ③ the construction difficulty of the works was decreased, the construction quantity was cut down, the construction cost was saved, the construction process was speeded up and the overall construction of Panshitou reservoir was promoted.