接岸引堤大块石回填地质成孔常见问题及解决措施

Common problems and solving measures of geological hole formation in large rock backfill of approach levee

为了在接岸引堤大块石回填地质条件下进行灌注桩基础施工,采用泥浆护壁冲孔灌注桩施工工艺。成孔过程中通过加大孔径纠偏,加大护筒厚度防止挤孔,加大护筒长度及孔内回灌混凝土堵漏,加大锤径、冲锤质量穿透孤石等施工措施,有效提高成孔效率,保证成孔质量,积累特殊地质条件下灌注桩成孔的施工经验,可供同类工程参考。

To carry out the construction of cast-in-place pile foundation under the geological condition of large rock backfill of the approach dike,we adopt the construction technology of slurry wall punching cast-in-place pile.In the course of drilling,some construction measures are taken,such as increasing the diameter of the hole to rectify the deviation,increasing the thickness of the casing to prevent the extrusion of the hole,increasing the length of the casing and filling the hole with concrete to stop up the leakage,increasing the diameter of the hammer and weight of the punching hammer to penetrate the boulder,etc.,by which the quality of hole-forming is guaranteed,and the experience of hole-forming construction of cast-in-place pile under special geological conditions is accumulated,serving as reference of similar projects.