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A platform for research: civil engineering, architecture and urbanism
Large special-shaped deep foundation pit supporting system and construction method
The invention relates to a large special-shaped deep foundation pit supporting system and a construction method. The construction method comprises the following steps that dewatering wells are constructed on the inner side and the outer side of an excavation area of a foundation pit; an adjustable shaped jig frame is adopted to manufacture a latticed column, a cast-in-situ bored pile is constructed in the foundation pit, and the lower end of the latticed column is poured on the cast-in-situ bored pile; the first-layer earthwork of the foundation pit is excavated in a sloping mode, and a soil body on the side wall of the foundation pit is reinforced; arranging a horizontal support system; earthwork of the foundation pit is excavated downwards layer by layer, and bottom sealing concrete is poured at the upper end of the steel sleeve; a main body structure in the foundation pit is constructed, and the dewatering well is blocked; and dismantling the recyclable anchor cable and cutting and dismantling the horizontal support section by section. The method has the beneficial effects that the double sealing plates are arranged on the outer side of the dewatering well steel sleeve to be matched with the stiffening steel wire mesh, and the sealing performance of the outer side of the steel sleeve can be effectively improved; the porous metal plate and the pressure relief pipe are arranged on the inner side of the steel sleeve, so that micro-expansive cement mortar can be effectively prevented from being extruded out of the steel sleeve, and the sealing effect is improved.
本发明涉及一种大型异形深基坑支护体系及施工方法，包括以下步骤：在基坑开挖区域内外侧施工降水井；采用可调式定型化胎架制造格构柱，在基坑内施工钻孔灌注桩，并将格构柱的下端浇筑在钻孔灌注桩上；放坡开挖基坑首层土方，并加固基坑侧壁的土体；设置水平支护体系；逐层向下开挖基坑的土方，在钢套管的上端浇筑封底混凝土；施工基坑内的主体结构，封堵降水井；拆除可回收锚索并逐段切割拆除水平支撑。本发明的有益效果是：降水井钢套管外侧设置双重封板配合加劲钢丝网，可有效提升钢套管外侧的密封性；钢套管内侧设置多孔金属板及泄压管，可有效避免微膨胀水泥砂浆从钢套管内挤出，提升密封效果。
Large special-shaped deep foundation pit supporting system and construction method
The invention relates to a large special-shaped deep foundation pit supporting system and a construction method. The construction method comprises the following steps that dewatering wells are constructed on the inner side and the outer side of an excavation area of a foundation pit; an adjustable shaped jig frame is adopted to manufacture a latticed column, a cast-in-situ bored pile is constructed in the foundation pit, and the lower end of the latticed column is poured on the cast-in-situ bored pile; the first-layer earthwork of the foundation pit is excavated in a sloping mode, and a soil body on the side wall of the foundation pit is reinforced; arranging a horizontal support system; earthwork of the foundation pit is excavated downwards layer by layer, and bottom sealing concrete is poured at the upper end of the steel sleeve; a main body structure in the foundation pit is constructed, and the dewatering well is blocked; and dismantling the recyclable anchor cable and cutting and dismantling the horizontal support section by section. The method has the beneficial effects that the double sealing plates are arranged on the outer side of the dewatering well steel sleeve to be matched with the stiffening steel wire mesh, and the sealing performance of the outer side of the steel sleeve can be effectively improved; the porous metal plate and the pressure relief pipe are arranged on the inner side of the steel sleeve, so that micro-expansive cement mortar can be effectively prevented from being extruded out of the steel sleeve, and the sealing effect is improved.
本发明涉及一种大型异形深基坑支护体系及施工方法，包括以下步骤：在基坑开挖区域内外侧施工降水井；采用可调式定型化胎架制造格构柱，在基坑内施工钻孔灌注桩，并将格构柱的下端浇筑在钻孔灌注桩上；放坡开挖基坑首层土方，并加固基坑侧壁的土体；设置水平支护体系；逐层向下开挖基坑的土方，在钢套管的上端浇筑封底混凝土；施工基坑内的主体结构，封堵降水井；拆除可回收锚索并逐段切割拆除水平支撑。本发明的有益效果是：降水井钢套管外侧设置双重封板配合加劲钢丝网，可有效提升钢套管外侧的密封性；钢套管内侧设置多孔金属板及泄压管，可有效避免微膨胀水泥砂浆从钢套管内挤出，提升密封效果。
Large special-shaped deep foundation pit supporting system and construction method
大型异形深基坑支护体系及施工方法
CAI WUHE (author) / HU HONGLIANG (author) / YAO SHANGWEI (author) / WU GAN (author) / ZHANG LEI (author) / ZHANG ZHILE (author) / HAN FUHAO (author)
2024-02-02
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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