普和金沙江特大桥双壁钢围堰施工技术探讨

摘要

Based on construction of main bridge foundation of Puhe Jinsha River super large bridge, this paper explored the construction method of"first cofferdam then pile"under the geological conditions of deep water and shallow river bed covering or naked bed rock, this method sunk the self-floating steel cofferdam underwater,and rise up at the cushion cap construction position. The project application result shows itˊs feasible to adopt the construction method of"first cofferdam then pile"under the geological conditions of shallow river bed covering or naked bed rock,then carry out underwater pile foundation and cushion cap construction.%以普和金沙江特大桥主桥基础施工为例,探讨在深水中河床覆盖层薄或裸露基岩的地质条件下,采用将自浮首节钢围堰整体下水,并在承台施工位置再接高的"先堰后桩"施工方法.工程应用结果表明,在河床覆盖层薄或裸露基岩的地质条件下采用"先堰后桩"方法进行水下桩基、承台施工是可行的.