黄河滩地液化砂层地质条件下承台围堰施工技术

Construction Technology of Pile Cofferdam under Liquefied Sand Layer Geology in Yellow River Beach

利用东营黄河特大桥滩地承台施工为实例,针对黄河滩地粉细砂地质,含水量大,水位高、易液化等特点,设计合理的承台围堰施工方案。利用既有15米长螺旋钢管施工围堰,结合井点降水,不设置内支撑开挖的方案,实践证明,方案设计合理,安全可靠,有效缩短了工期,节约了施工成本。

Taking the pile cofferdam construction of Dongying Yellow River bridge beach for instance, according to the characteristics of Yellow River beach including silty sand geology, large content of water, high water level and easy liquefaction, reasonable pile cofferdam construction method is designed. The existing 15m spiral steel tube is used for the cofferdam construction combined with well dewatering without internal support. Practice shows that the method is reasonable and safe, which shortens the construction period and saves cost.