Karst area pile foundation construction method and karst area pile foundation construction device: Fid-Bau Portal

Karst area pile foundation construction method and karst area pile foundation construction device

LIU CHUHUI / LI ZENAN / GAO ZHANHUA / ZHONG XUANLIANG

The invention discloses a karst area pile foundation construction method and a karst area pile foundation construction device.The karst area pile foundation construction method comprises the following steps that an outer pile casing is buried to the preset pile bottom position in the karst ground, and rock soil in the outer pile casing is dug out so that a pile hole matched with the outer wall of the outer pile casing can be formed in the karst ground; an inner pile casing is installed in the outer pile casing, a reinforcement cage is installed in the inner pile casing, concrete is poured into the inner pile casing, and after the concrete is condensed, the concrete and the reinforcement cage form a pile body; and the outer pile casing is pulled out, a filling gap is formed between the inner pile casing and the hole wall of the pile hole, and the filling gap is filled with gravel. According to the karst area pile foundation construction method, the outer pile casing is buried in the karst ground firstly to form a stable and reliable protection wall, the problems of hole collapse, diameter expansion (shrinkage) and the like are effectively prevented, and the karst area pile foundation construction method has the advantages of being high in construction efficiency and good in pile foundation quality.

本发明公开一种岩溶地区桩基施工方法及岩溶地区桩基施工装置，所述岩溶地区桩基施工方法包括以下步骤：埋设外护筒至岩溶地面内的预设桩底位置，并挖出所述外护筒内的岩土，以使岩溶地面内形成与所述外护筒的外壁匹配的桩孔；在所述外护筒内安装内护筒，并在所述内护筒内安装钢筋笼，向所述内护筒内浇注混凝土，待混凝土凝结后与所述钢筋笼形成桩身；将所述外护筒拔出，所述内护筒与所述桩孔的孔壁之间形成填充间隙，向所述填充间隙内填充碎石。岩溶地区桩基施工方法通过在岩溶地面内先埋设外护筒，以形成稳定可靠的护壁，有效防止了塌孔、扩(缩)径等问题，具有施工效率高、桩基质量好的优点。

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