大跨径连续箱梁加固新浇混凝土裂缝原因及控制

Cause Analysis and Treatment Measure on Cracks in New Reinforced Concrete Restricted by Old Web Concrete

介绍了一座主跨80 m的多跨预应力混凝土变截面连续箱梁主桥,在维持通车情况下在箱内浇注大批量混凝土,但新浇腹板混凝土受到旧腹板约束而引起收缩裂缝,对新增混凝土裂缝情况介绍、原因分析及控制措施。

In this paper, the cause analysis about cracks on the new concrete web poured in multi -span continuous box -girder of a main bridge was introduced. This bridge is a prestressed concrete one with variable cross sections and an 80 -meter main span. When casting reinforced concrete in large volume in box girder during vehicle transport service, the shrinkage cracks in cast -in place reinforced web concrete were formed due to the restriction of old web concrete. Then, the control measure taken on these cracks is discussed.