孔内制作钢筋笼新技术在大直径超深人工挖孔桩施工中的应用

Application of Making Reinforcing Cage in Borehole in the Constrution of Large Diameter and Overdeep Hand-dug Pile

基桩工程施工中,传统工艺方法是在地面上专门制作钢筋笼,然后吊运、安放在桩孔内。这对大直径超深人工挖孔灌注桩施工来讲十分困难,难以保证工程质量。采用在孔内直接制作钢筋笼新的技术方法,将钢筋笼制作、安放工序在桩孔内直接同步完成,省去了大直径钢筋笼的吊运、安放工序,很好地解决了地面制作大直径钢筋笼的特殊支撑、加固以及吊运、安放过程中的变形等难题。提高了施工效率,降低了作业成本,确保了工程质量,具有较好的推广应用价值。

The reinforcing cages should be manufactured on the ground firstly, then lifted and placed in borehole in traditional piling construction technology. It is rather difficult to construct hand-dug pile with special large diameter and depth. In addition, the quality of engineering can＇t be guaranteed. The paper introduces a new technology that fabrication and deployment of reinforcing cages are implemented simultaneously in such boreholes. In this way, the procedure of lifting and placing the reinforcing cages with large diameter can be removed. At the same time, following problems have been resolved, such as special support and strengthening facilities to be made for manufacturing large-diameter reinforcing cages on the ground, and deformation in lifting and placing these reinforcing cages. As a conclusion, efficiency of construction can be improved with lower cost and higher quality, so this new technology is worthy pervasive practical application.