高水头船闸闸首大体积混凝土综合施工技术
|
摘要
针对高水头船闸闸首混凝土体积大,且布置有多种结构埋件、孔洞、廊道等,温度应力及结构断面变化易造成混凝土开裂等问题,结合株洲二线船闸闸首施工实例,对高掺低胶混凝土配合比设计、温控措施、缓凝砂浆及大体积混凝土浇筑等关键技术进行研究。采取三掺配比和层间铺筑缓凝砂浆的方法,并结合适当的温控措施,船闸闸首未出现温度裂缝及层间渗水现象。通过本工程的实施,总结提炼了整套闸首大体积混凝土施工防止温度裂缝及层间裂缝的技术成果,可为同类船闸工程施工提供借鉴。
In view of the large volume of concrete for the head of high-head ship lock and the arrangement of various structures such as buried parts,holes and corridors,the severe changes of temperature stress and structure which are liable to cause concrete cracking,and combining with the construction of Zhuzhou second-line ship lock head,we carry out a research on key technologies such as the mix proportion design,temperature control measures,as well as the retarded mortar and mass concrete pouring. Adopting the method of three mixing and laying retarded mortar between layers, and combining with appropriate temperature control measures, no temperature cracks or interlayer seepage occur at the lock head. Based on the implementation of this project,we summarize the technical achievements of preventing temperature cracks and interlayer cracks in mass concrete construction of lock head,which may serve as reference for similar ship lock construction.
In view of the large volume of concrete for the head of high-head ship lock and the arrangement of various structures such as buried parts,holes and corridors,the severe changes of temperature stress and structure which are liable to cause concrete cracking,and combining with the construction of Zhuzhou second-line ship lock head,we carry out a research on key technologies such as the mix proportion design,temperature control measures,as well as the retarded mortar and mass concrete pouring. Adopting the method of three mixing and laying retarded mortar between layers, and combining with appropriate temperature control measures, no temperature cracks or interlayer seepage occur at the lock head. Based on the implementation of this project,we summarize the technical achievements of preventing temperature cracks and interlayer cracks in mass concrete construction of lock head,which may serve as reference for similar ship lock construction.
引文
[1]中交武汉港湾工程设计研究院有限公司.水运工程大体积混凝土温度裂缝控制技术规程:JTS 202-1—2010[S].北京:人民交通出版社,2010.
[2]中交天津港湾工程研究院有限公司.水运工程混凝土施工规范:JTS 202—2011[S].北京:人民交通出版社,2011.
[3]中交第二航务工程局有限公司.船闸工程施工规范:JTS218—2014[S].北京:人民交通出版社,2014.
[2]中交天津港湾工程研究院有限公司.水运工程混凝土施工规范:JTS 202—2011[S].北京:人民交通出版社,2011.
[3]中交第二航务工程局有限公司.船闸工程施工规范:JTS218—2014[S].北京:人民交通出版社,2014.