长江上游地区桥梁钢围堰施工方案选择

摘要

Steel cofferdams are necessary equipment in foundation construction of bridges in water. The upstream region of the Yangtze River is characterized by narrow site, steep terrain and large change of water level, etc. , so construction schemes of cofferdams are quite different from those in midstream and downstream regions of the Yangtze River and are of vital importance since their correctness influences not only construction cost and period of bridges, but also success of the whole bridges directly. Based on practical experiences, the paper summarizes hydrological and topographical features of upstream region of the Yangtze River and multiple construction methods of steel cofferdams, and points out applicable conditions of various methods with a hope of being capable of providing a reference for foundation construction of bridges in deep water.%钢围堰是桥梁水中基础施工不可或缺的装备。长江上游地区具有场地狭窄、地形陡峭、水位变化大等特点，围堰施工方案与长江中下游地区有很大区别，其正确与否不仅影响到桥梁建造成本和工期，甚至直接影响到全桥的成败与否。笔者基于实践经验，对长江上游地区的水文地形特点和钢围堰施工多种方法进行总结，指出各种方法的适用条件，为桥梁深水基础施工提供参考。