摘要
本文以重庆涪江特大桥41#、42#主墩水中基础施工为背景,结合涪江河床为深浅不一的卵石地层,且卵石密度和粒径较大并下伏泥岩的特殊地质条件,通过对围堰在技术、安全、经济、工期等方面进行方案比选,最终确定采用钢壁混凝土围堰的结构形式.同时运用Midas空间有限元软件建立钢壁混凝土围堰实体模型进行计算,分析了钢壁混凝土围堰与封底混凝土施工阶段应力情况;介绍了钢壁混凝土围堰安装、运输、下沉和封底等主要施工工艺,对今后类似工程结构设计与施工有一定的借鉴意义.
Based on the underwater foundation construction of the 41# and 42# main piers of Fujiang Bridge in Chongqing,and combined with the fact that the Fujiang River bed is a cobblestone stratum with different depths,high density and large size of the particles,as well as the special geological conditions of underlying mudstone,the structural form of steel-walled concrete cofferdam is finally adopted by comparing and selecting cofferdam schemes in terms of technology,safety,economy and construction periotl.The entity model of steel-walled concrete cofferdam is calculated by using Midas finite element software.Subsequently,the stress situations of steel-walled concrete cofferdam and bottom-sealing concrete during construction are analyzed.The main construction technologies of installation,transportation,sinking and bottom-sealing of steel-walled concrete cofferdam are introduced,which could provide certain reference for similar engineering structure design and construction in the future.
作者
任建伟
Ren Jianwei(Survey and Design Institute of China Railway 17^th Bureau Group Co.Ltd.,Taiyuan Shanxi 030032,China)
出处
《铁道建筑技术》
2019年第11期42-46,共5页
Railway Construction Technology
基金
中铁十七局集团有限公司科技研究开发计划项目(2018-90)
关键词
钢壁混凝土围堰
深水基础
设计
施工
封底混凝土
数值计算
steel-walled concrete cofferdam
deep water foundation
design
construction
bottom-sealing concrete
numerical calculation
