延延高速公路黄河大桥水中基础施工技术

Construction Technology of Underwater Foundation for the Yellow River Bridge on Yan’an-Yanchuan Expressway

依托延延高速公路黄河大桥水中基础施工，介绍了大桥水中基础施工方案的比选和设计，并对围堰、钻孔桩、承台的施工过程进行了总结。通过对施工条件的分析，采取先筑土坝拦水，开挖基坑浇筑混凝土围堰，然后施工钻孔桩和承台的方法，满足了施工安全和进度要求，对类似工程有一定参考作用。

Based on the construction technology of underwater foundation for the Yellow River Bridge on Yan’an-Yanchuan Expressway,this article introduces the comparison and design of construction schemes,and summarizes the construction process of the cofferdam,bored piles and pile caps.According to the analysis of construction conditions,the following schemes are adopted during the construction,first damming up water,excavating the foundation pit for pouring concrete cofferdam,and then setting the bored piles and pile caps,which satisfies the requirements of both construction safety and schedule and also provides references for the similar kind of construction in the future.