淮安枢纽立交地涵混凝土结构防裂措施

Crack control measures of underpass culvert concrete structure for Huai'an project

淮河入海水道近期工程淮安枢纽立交地涵主体工程,是亚洲规模最大的一座立交地涵,也是淮河入海水道上4座枢纽建筑物中技术最为复杂的一项工程。由于立交地涵涵身段长度为31.3m,超过了水闸设计规范中有关结构设计中段块尺寸最大长度的限制,因此,立交地涵主体钢筋混凝土防裂成为施工过程中的一个必须解决的比较复杂的技术问题。为了防止和避免涵身主体钢筋混凝土发生裂缝,在施工过程中采取了一系列防裂措施,实践证明这些措施是有效的,投入运行的主体工程混凝土未发生一条裂缝。

The underpass culvert concrete structure for Huaian projectis the largest in Asia and the most complicated one of 4 projects for the Huaihe waterway to sea. Since the underpass culvert has a length of 31.272 m, exceeding the limit set out in the design specifications of water sluices, concrete crack control of the underpass culvert becomes a complicated technical challenge. A series of measures are adopted during construction to prevent the reinforcement concrete from cracking. These measures are proved to be effective and no crack has occurred since the main concrete structure is put in operation