超长底板混凝土结构加强带取代后浇带的工程应用实例

An engineering example of replacing post casting belt by expanding reinforcing belt in ultra-long base plates concrete structure

超长基础底板施工中后浇带的留置有利于解决超长结构温度应力及高低层差异沉降应力导致底板裂缝,但影响结构安全及防水质量。实际施工中,后浇带浇筑质量也很难保证。因此,尽量减少后浇带的留置对结构是有利的,单靠设置后浇带不足以解决混凝上收缩和温度变化问题时,可以考虑采用补偿收缩混凝土,在适当位置设置膨胀加强带。采用这种方法,不仅可以进一步增大伸缩缝最大间距,而且可以用膨胀加强带取代部分施工后浇带,从而实现混凝土的连续浇筑即无缝施工。

Setting post casting belt in ultra-long base plates can avoid the crack caused by temperature and differential settlement of high and low levels,while it will also influence structure safety and waterproof.The placement quality of post-pouring belt is difficult to guarantee in practice.Therefore,reducing post casting belt is good to structure.Setting expanding reinforcing belt at appropriate position using shrinkage-compensating concrete is a good choice.By this way,it can not only increase suitably the biggest space of the expansion joint but also replace the concrete post casting belt by expanding reinforcing belt,and realize concrete continuous placement.