钻孔灌注桩“浮笼现象”的预防措施

Prevention Measures for " Floating-cage Phenomenon" of Cast-in-situ Pile

桩基础施工中,小桩径"半截钢筋笼"和桩长较短的钢筋笼,在灌注水下混凝土施工时,由于各种原因经常发生钢筋笼上浮。"浮笼现象"改变了桩基础的结构受力情况,严重的会造成返工,其危害性较大。探讨总结"浮笼现象"的预防措施,经过比较分析最后精选出使用钢筋定位器的方法预防钢筋笼上浮。该方法消耗的材料极少,操作简单易学,既确保了灌注混凝土质量,又有利于提高经济效益,并能够有效预防"浮笼现象"的发生。

In the construction of pile foundation,the small-diameter 'half reinforced cage' and the shorter reinforced cage often float because of various causes during the pouring construction of underwater concrete.The 'floating-cage phenomenon' will change the structural stress state of pile foundation,and will cause the rework with the greater danger if seriously.The article discusses and sums up the prevention measures for the 'floating-cage phenomenon'.After the comparison and analysis,it is finally to select the method of steel fixer to prevent the reinforced cage from floating.The consumed materials of this method are a few,and its operation is simple and easy to learn.This method not only ensures the pouring quality of concrete,but also makes for the improvement of economic benefit,and can also efficiently prevent the cause of 'floating-cage phenomenon'.