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灌注桩成孔后清空不彻底、钻头钻孔时对孔壁土层的扰动和后期孔壁泥浆干缩以及桩身混凝土凝固干缩造成的桩侧空隙,在桩基承载时出现沉降从而造成桩基承载力的减弱。通过在钢筋笼上预埋注浆管和注浆阀,利用高压注浆泵在桩身混凝土凝固后对桩底和桩底后注浆,对桩底沉渣空隙和桩侧泥皮空隙、土层将浆液渗入、劈裂、填充、挤密等作用与桩体周围土层结合为一体,从而增强桩侧阻力和桩端承载力,减小沉降提高单桩承载力。
After filling the hole, the emptying of the perfusion pile is not complete. When the drill bit is drilled, the pile-side voids caused by the disturbance of the hole wall soil and the dry shrinkage of the hole wall mud and the condensation and shrinkage of the concrete in the pile body during the boring of the pile cause settlement Weakening of bearing capacity. By injecting the grouting pipe and grouting valve in the steel cage, using the high-pressure grouting pump, after the concrete of the pile body is solidified, the pile bottom and the bottom of the pile are grouted, The seepage, splitting, filling and squeezing of the slurry are integrated with the soil around the pile to enhance the lateral resistance of the pile and the bearing capacity of the pile end, and reduce the settlement to improve the bearing capacity of the pile.