深水桥墩钢板桩围堰深层水平位移预警值研究  

Study on Early Warning Value of Deep Horizontal Displacement of Deep Water Bridge Pier Steel Sheet Pile Cofferdam

作　　者：彭文勇 李昌俊 卜向远 李英军 PENG Wen-yong;LI Chang-jun;BU Xiang-yuan;LI Ying-jun(Zhejiang Engineering Construction Management Co.,Ltd.,Hangzhou 310006,China;Xicheng Engineering Design Group Co.,Ltd.,Hangzhou 310006,China)

机构地区：[1]浙江工程建设管理有限公司,浙江杭州310006 [2]西城工程设计集团有限公司,浙江杭州310006

出　　处：《中国市政工程》2022年第1期72-75,125,126,共6页China Municipal Engineering

基　　金：2020年浙江省建设科研项目,课题编号2020K181。

摘　　要：深水桥墩钢板桩围堰深层水平位移值是钢板桩围堰安全关键指标。GB 50497—2019《建筑基坑工程监测标准》要求钢板桩支护结构深层水平累计位移预警值采取双控,取累计位移绝对值和相对基坑设计深度H控制值中的较小值作为预警值。以某大桥工程项目为例,对深水桥墩钢板桩围堰深层水平位移值进行研究,空间有限元法计算值和现场实测值表明,深水桥墩钢板桩围堰深层水平位移累计绝对值远超GB 50497—2019规定的预警值。由于钢板桩围堰位于河道中,是一个相对独立的体系,采用相对基坑设计深度H控制值作为预警值对钢板桩深层水平位移进行控制比较合理,并在大桥工程桥墩围堰施工中得到证明。The deep horizontal displacement value of the steel sheet pile cofferdam of the deep water pier is the key safety index of the steel sheet pile cofferdam.GB 50497—2019 Standards for Construction Foundation Pit Engineering Monitoring requires double control of the early warning value of the deep horizontal cumulative displacement of the steel sheet pile supporting structure,and the smaller of the absolute value of the cumulative displacement and the control value of the relative foundation pit design depth H is taken as the early warning value.Taking a bridge engineering project as an example,the deep water pier steel sheet pile cofferdam deep horizontal displacement value is studied.The spatial finite element method calculation value and the field measured value show that the deep water pier steel sheet pile cofferdam deep layer horizontal displacement The cumulative absolute value far exceeds GB 50497,the early warning value stipulated in 2019.Since the steel sheet pile cofferdam is located in the river and is a relatively independent system,it is reasonable to use the relative foundation pit design depth H control value as the early warning value to control the deep horizontal displacement of the steel sheet pile,which has been proved in the construction of the bridge pier cofferdam.

关 键 词：深水桥墩 钢板桩围堰 深层水平位移 预警值 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]