冲击咬合桩围堰在桥梁深水基础施工中的应用

钻孔咬合桩作为一种支护围挡结构，在地铁车站和高层建筑的深基坑施工中有着广泛的应用，但其对钻机选型、混凝土性能、施工场地和施工工艺均有着较高的要求，达成铁路九龙滩沱江大桥5号墩基础，一边毗邻既有公路，一边伸入沱江水库，地形、地质条件极为复杂，施工中首次采用冲击咬合桩作为支护、防水围堰，成功解决了该墩深水开挖的难题，为类似桥墩基础施工提供了宝贵的经验。

Occludent Pile Cofferdam Formed by Impact Drill Applied in the Construction of Deep Water Foundation in Bridge

As a supporting structure, occludent pile cofferdams are widly used in the subway station and high-rise building. But occludent pile cofferdam needs a high level in selecting the impact drill, capability of the concrete, construction plant and construction technology. The foundation of the fifth pier in the Jiulongtan Tuojiang major brige in the Dazhou- Chengdu railway line, one side of the foundation is close to existing higway, the other side extends into the Tuojiang reservoir, topography and geological structure are extremely complex. Occludent pile cofferdam was first used in bridge construction, difficult problem of deep water foundation construction is solved. Successful experience was provided to other similar engineering.