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A platform for research: civil engineering, architecture and urbanism
Micro-disturbance construction method for full-casing cast-in-situ bored pile adjacent to subway
The invention provides a micro-disturbance construction method for a full-casing cast-in-situ bored pile adjacent to a subway, and belongs to the technical field of foundation engineering. The micro-disturbance construction method adopts a 360-degree full-rotation drilling machine to rotate a customized steel casing into soil firstly, so that the steel casing penetrates through (3)-4b silty clay powder mixed lump silty-fine sand layer and (3)-4c silty-fine sand layer to enter a supporting layer by 100 mm; then, a rotary drilling rig is adopted for taking soil in a cylinder, a reinforcement cage is lowered, concrete is poured, slight disturbance to an adjacent subway is achieved in the whole construction process, a customized steel sleeve with a plate tooth tool bit is used for drilling, through reasonable segmentation of the steel sleeve, optimization of the connection mode between segments and the like, the steel sleeve can smoothly penetrate through a silty-fine sand layer with the thickness of 17 m without deformation, and the hole forming quality is guaranteed; and due to the fact that a steel sleeve protecting wall is adopted in the hole forming process, the phenomena of sandflowing, sand gushing and hole collapsing in a hole are effectively prevented, the pile forming quality of concrete in the sleeve is improved, a soil body is basically free of deformation in the construction process, and the influence on the surrounding environment is effectively controlled.
本发明提供了邻近地铁全套管钻孔灌注桩微扰动施工方法，属于地基基础工程技术领域，本发明采用360°全回转钻机将定制钢套管先行旋转入土，使钢套管穿过③‑4b粉质粘土粉混团块状粉细砂层、③‑4c粉细砂层进入持力层100mm，然后采用旋挖钻机筒内取土，下放钢筋笼，灌注混凝土，施工全程实现对邻近地铁的微扰动，利用一种带板齿刀头的定制钢套管进行钻孔，通过钢套管的合理分节、优化分节间的连接方式等，使钢套管顺利穿过17m厚粉细砂层不变形，保证成孔质量，由于成孔时采用钢套管护壁，有效防止孔内流砂、涌砂塌孔现象的发生，提高套管内混凝土成桩质量，施工时土体基本无变形，从而有效控制对周边环境的影响。
Micro-disturbance construction method for full-casing cast-in-situ bored pile adjacent to subway
The invention provides a micro-disturbance construction method for a full-casing cast-in-situ bored pile adjacent to a subway, and belongs to the technical field of foundation engineering. The micro-disturbance construction method adopts a 360-degree full-rotation drilling machine to rotate a customized steel casing into soil firstly, so that the steel casing penetrates through (3)-4b silty clay powder mixed lump silty-fine sand layer and (3)-4c silty-fine sand layer to enter a supporting layer by 100 mm; then, a rotary drilling rig is adopted for taking soil in a cylinder, a reinforcement cage is lowered, concrete is poured, slight disturbance to an adjacent subway is achieved in the whole construction process, a customized steel sleeve with a plate tooth tool bit is used for drilling, through reasonable segmentation of the steel sleeve, optimization of the connection mode between segments and the like, the steel sleeve can smoothly penetrate through a silty-fine sand layer with the thickness of 17 m without deformation, and the hole forming quality is guaranteed; and due to the fact that a steel sleeve protecting wall is adopted in the hole forming process, the phenomena of sandflowing, sand gushing and hole collapsing in a hole are effectively prevented, the pile forming quality of concrete in the sleeve is improved, a soil body is basically free of deformation in the construction process, and the influence on the surrounding environment is effectively controlled.
本发明提供了邻近地铁全套管钻孔灌注桩微扰动施工方法，属于地基基础工程技术领域，本发明采用360°全回转钻机将定制钢套管先行旋转入土，使钢套管穿过③‑4b粉质粘土粉混团块状粉细砂层、③‑4c粉细砂层进入持力层100mm，然后采用旋挖钻机筒内取土，下放钢筋笼，灌注混凝土，施工全程实现对邻近地铁的微扰动，利用一种带板齿刀头的定制钢套管进行钻孔，通过钢套管的合理分节、优化分节间的连接方式等，使钢套管顺利穿过17m厚粉细砂层不变形，保证成孔质量，由于成孔时采用钢套管护壁，有效防止孔内流砂、涌砂塌孔现象的发生，提高套管内混凝土成桩质量，施工时土体基本无变形，从而有效控制对周边环境的影响。
Micro-disturbance construction method for full-casing cast-in-situ bored pile adjacent to subway
邻近地铁全套管钻孔灌注桩微扰动施工方法
SHI HONGLIANG (author) / ZHANG JIANJIAN (author) / LIU JUN (author) / LUO YANAN (author) / QIU JIN (author)
2021-01-26
Patent
Electronic Resource
Chinese
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