提高钻孔灌注桩承载力的措施

The Measures of Raising Bearing Capacity of Bore Cast—in—place Piles

灌注桩施工工艺环节多,边界条件复杂,因此,桩尖阻力偏小,浅部发生扩径、缩径和断桩等现象较多。经检测,用扩大桩径(如φ1100mm)的方法提高灌注桩承载力,有待进一步探索;采用凹凸形变径灌注桩或向桩端、桩侧压力注浆等措施,提高钻孔灌注桩的承载力是切实有效的。

the working method and process of constructing bored cast -in-place piles are very complicated and variety,so there occurred many phenomena such as, small resistance of pile toe, expansive and shrinkage of hole diameters, pile break and crack. The method of expansion pile diameter to raise pile capacity should be further studied. It is effective and practicable methods of raising bearing capacity of bored cast-in-place piles by diameter change piles of concave and convex shape or pressure grouting into pile toe and pile skin.