分步浇筑大体积混凝土冷却水管一体化布置控裂技术  

Integrated cooling water pipe crack control technology for step-by-step casting of mass concrete

作　　者：李维洲 王成启[2] 刘刚 谷坤鹏[2] LI Wei-zhou;WANG Cheng-qi;LIU Gang;GU Kun-peng(China Communications Construction Co.,Ltd.,Beijing 100088,China;CCCC Shanghai Third Harbor Scientific Research Institute Co.,Ltd.,Shanghai 200030,China;CCCC Third Harbor Engineering Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]中国交通建设股份有限公司,北京100088 [2]中交上海三航科学研究院有限公司,上海200030 [3]中交第三航务工程局有限公司,上海200032

出　　处：《中国港湾建设》2020年第7期33-37,共5页China Harbour Engineering

摘　　要：针对混凝土工程在分步施工过程中施工缝附近存在较高的温度梯度问题,在传统冷却水管基础上提出了一种基于分步浇筑的大体积混凝土冷却水管一体化布置控裂技术,并通过埋设温度测点的方式对比研究了冷却水管一体化布置技术对混凝土内部温度的影响。结果表明,采用冷却水管一体化布置控裂技术,"二步"混凝土在温升过程中可以均匀地、同步地提高"一步"已浇筑混凝土的温度,加强了分步浇筑混凝土温度变化的均匀性;可以显著降低施工缝两侧的温差,提高温度均匀性,裂缝的数量、宽度、长度均有明显减少。In order to solve the problem of high temperature gradient near the construction joints in the step-by-step construction process of concrete engineering, an integrated cooling water pipe crack control technology based on step-by-step casting was proposed based on the traditional cooling water pipe, and the influence of the technology on the internal temperature of concrete was studied by embedding temperature measuring points. The results show that in the process of "twostep" concrete temperature rising, the temperature of "one-step" concrete can be raised evenly and synchronously with the integrated cooling water pipe crack control technology, which strengthens the uniformity of temperature change of step-by-step casting of concrete. It can significantly reduce the temperature difference on both sides of the of construction joints, improve the uniformity of temperature, and significantly reduce the number, width and length of cracks.

关 键 词：分步浇筑 大体积混凝土 冷却水管 施工缝 温度差 温度均匀性 

分 类 号：U655.56[交通运输工程—港口、海岸及近海工程]