高压旋喷注浆法在钻孔灌注嵌岩桩底持力层补强加固中的应用

Application of High-pressure Rotary Concrete-jetting Technology in the Reinforcement of the Bearing Layer of Rock-socketed Cast-in-place Pile Bottom

文中以清远北江大桥扩建工程1#墩1#桩桩底持力层强度不足为案例,从高压旋喷注浆的原理、实施步骤等方面阐述解决钻孔灌注嵌岩桩底持力层承载力不足的补强加固方法。实践证明:高压旋喷注浆补强加固方法简单可行,安全可靠。

From the theory and the implementation procedure of high- pressure rotary concrete-jetting technology, the authors, who take the extension project of Qingyuan Beijiang River Bridge which is strength inadequacy in the bearing layer of pile bottom of the first pier and the first pile as an example, show the way how to solve the problem of carrying capacity inadequacy in the bearing layer of rock-socketed cast-in-place pile bottom. The practice proves that the high-pressure rotary concrete-jetting technology is simple, feasible and safe.