大体积混凝土基础施工与温度控制

Construction and temperature control of mass concrete foundation

长沙洪山大桥基础属大体积混凝土结构,施工期间适逢长沙地区进入雨季,河水上涨,对此,确定了合理的混凝土浇筑顺序,采用水平分层、斜向分段的总体施工方案;在具体施工过程中,通过采取优化混凝土配合比、双掺技术、设置循环冷却水管和现场监测混凝土内部及表面的温度等技术措施,成功地控制了温度和混凝土裂缝的产生,确保了该大体积混凝土结构的施工质量。

The foundation of Hongshan Bridge is a structure of mass concrete,and it was constructed in the rain season when the river rose.In view of that,we determined reasonable construction sequence and adopted the general construction scheme of horizontal slicing and oblique sectionalizing.During the foundation construction,through optimizing the mixing ratio of concrete,adopting the double-mixture technology,setting the water cooling pipes,and monitoring on site the concrete temperature both inside and on the surface,we successfully controlled the temperature and cracks of concrete,and ensured the quality of the mass concrete structure.