黄河深水承台咬合桩围堰施工技术

Construction Technology on Occlusive Pile Cofferdam for Pile Cap in Deep Water of the Yellow River

针对雁白黄河大桥主桥1、2号墩处于黄河河道内,承台及部分墩身位于水位线以下的实际情况,提出咬合桩围堰施工的方法,采用咬合桩内外圆相切原理,从而形成密闭围堰空间,实现闭水效果。咬合桩内利用工字钢加钢管的支撑方式增加结构整体安全性,经实际操作很好地解决了深水基坑施工的问题。

In connection with the actual situation that the No. 1 and No. 2 pier of Yanbai Yellow River main bridge are in river channel and pile cap and part of the pier are under the water level,we put forward the method of cofferdam construction with occlusive pile. Through the principle of inner-outer circle tangent of occlusive pile,the sealed cofferdam space is formed,thus the closed water effect is achieved. With I-beam and steel tube support in occlusive pile,the overall security of the structure is increased. After practice,the problems of deep foundation pit construction are well solved.