围堰下穿既有高速公路的土石加载施工技术

Construction Technology of Earth Rock Loading under Cofferdam through Existing Expressway

以浙江省青田水利枢纽工程二期上游横向围堰(土石结构)施工为例,对下穿既有高速公路土石加载施工方法进行总结。在对设计施工方案进行充分研究的基础上,结合工程施工经验,对二期上游横向围堰下穿高速公路段通过采用分区域分层均衡填筑、分部基础处理、分级加载的施工方案,确保高速公路运营安全,成功地解决加载对高速公路桥梁结构影响的施工技术难题和组织难题。

Taking the construction of the second stage upstream transverse cofferdam(earth rock structure)of Qingtian water conservancy project in Zhejiang Province as an example,this paper summarizes the earth rock loading construction method of Underpass existing expressway.Based on the full study of the construction scheme proposed in the design and combined with the relevant construction experience,the construction scheme of sub regional layered balanced filling,sub foundation treatment and graded loading is adopted for the section of the second stage upstream horizontal cofferdam Undercrossing the expressway,which ensures the operation safety of the expressway,and successfully solves the construction technical problems of the influence of loading on the bridge structure of the expressway organize problems and provide reference and handling ideas for similar projects.