不同浇筑工艺对沉管裂缝控制的影响分析  

Analysis of the Effects of Different Pouring Technologies on Crack Control of Immersed Tube

作　　者：王彦林 徐兆全[2] 熊建波[2] 

机构地区：[1]港珠澳大桥管理局,广东珠海519015 [2]中交四航工程研究院有限公司水工构造物耐久性技术交通行业重点实验室,广东广州510230

出　　处：《施工技术》2014年第11期64-65,75,共3页Construction Technology

摘　　要：通过某沉管试验段温度应力计算和混凝土龄期差下收缩约束应力分析,对目前沉管结构通常采用的分层浇筑工艺和全断面浇筑工艺对裂缝控制的影响进行了研究。研究表明,分层浇筑工艺下沉管会产生更大的温度应力和收缩约束应力,开裂风险较大,采用时需重点注意混凝土温升、浇筑时间间隔等指标。By the calculation of temperature stress and the analysis of shrinkage stress in concrete different age of some immersed tube test section, the effects of two current popular pouring technologies（including layered pouring and full-face pouring） on crack control of immersed tube are studied. The results show that the immersed tube has larger temperature and shrinkage stress under layered pouring technology, and its cracking risk is bigger. During immersed tube construction, temperature rise, casting time interval of concrete and so on should be emphasized under layered pouring technology.

关 键 词：桥梁工程 混凝土 沉管 浇筑 裂缝 施工技术 

分 类 号：U445.57[建筑科学—桥梁与隧道工程]