施工技术 2014年6月上 64 CONSTRUCTION TECHNOLOGY 第43卷第11期 D01:10.7672/sgjs2014110064 不同浇筑工艺对沉管裂缝控制的影响分析 王彦林，徐兆全2，熊建波2 (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) [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. [关键词]桥梁工程；混凝土；沉管；浇筑；裂缝；施工技术 [中图分类号]U445.57 [文献标识码]A [文章编号]1002-8498(2014)11-0064-02 Analysis of the Effects of Different Pouring Technologies on Crack Control of Immersed Tube Wang Yanlin' Xu Zhaoquan2 Xiong Jianbo㎡ (1.Hong Kong-Zhuhai-Macao Bridge Authority Zhuhai Guangdong 519015 China; 2.Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications CCCC Fourth Harbor Engineering Institute Co.Lsd.Guangzhou Guangdong 510230 China) Abstract: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. Key words:bridges;concrete;immersed tubes;pouring;cracks;construction 0引言 前由于混凝土早期应力形式较为复杂无法准确获 沉管作为目前一种...
不同浇筑工艺对沉管裂缝控制的影响分析.pdf
