Based on the engineering practice, this paper introduced constructional technique and quality assurance measures of big bore hole digging and pouring with expansion pile head.
通过工程实例，介绍大孔径扩大桩头人工挖孔灌注桩的施工方法及质量保证措施。
In the construction of retaining wall with steep slope grade, manual hole digging piles are adopted in combination with reverse working for ramming reinforced concrete wall panel.
高坡挡土墙施工中采用人工挖孔桩，并结合逆作法捣筑钢筋混凝土墙板的方法，具有无需土方大开挖、无需支撑、施工安全和节约基建投资等优点。
In the construction of retaining wall with steep slope grade, manual hole digging piles are adopted in combination with reverse working for ramming reinforced concrete wall panel.
高坡挡土墙施工中采用人工挖孔桩，并结合逆作法捣筑钢筋混凝土墙板的方法，具有无需土方大开挖、无需支撑、施工安全和节约基建投资等优点。
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