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A platform for research: civil engineering, architecture and urbanism
Construction method of precast pile group pile foundation in bead type karst cave stratum
The invention discloses a construction method of a precast pile group pile foundation in a bead-like karst cave stratum, and aims to solve the problems that the construction of a large-diameter single pile foundation in the bead-like karst cave stratum is difficult and high in cost, but if a shallow karst cave spacing board meets the requirements of medium and small-diameter piles on the thickness of a bearing layer, the precast pile (such as a tubular pile) group pile foundation can be designed and adopted; before construction, rubber rings are additionally arranged at two positions of a precast pile body, and the rubber rings are inflated and pressurized for the first time; a bearing platform foundation pit is excavated, and the position of a foundation pile is measured; drilling to a certain depth of the spacing board at the pile position by adopting a cast-in-situ bored pile steel casing follow-up method, and completing hole cleaning; according to the construction method, the small-and-medium-diameter tubular pile group is adopted to replace a single large-diameter cast-in-place pile, the problems that a large-diameter single pile foundation is large in construction depth, complex in process, difficult to control in pile forming quality and poor in economic benefit are solved, the adopted precast piles can bear loads within a short time after being formed, and the construction efficiency is improved. And the construction period can be greatly shortened.
本发明公开了一种串珠型溶洞地层中预制桩群桩基础的施工方法，串珠状溶洞地层中施工大直径单桩基础难度大、造价高，但如浅层溶洞间隔板满足中小直径桩对持力层厚度要求，则可设计采用预制桩(如管桩)群桩基础，施工前在预制桩桩身上两处加装橡胶圈，并对橡胶圈进行初次充气加压；开挖承台基坑，并放测基桩位置；在桩位处采用钻孔灌注桩钢护筒跟进法钻至间隔板一定深度并完成清孔；在钢护筒内下放预制桩，本发明通过采用中小直径管桩群桩代替单根大直径灌注桩，避免了大直径单桩基础施工深度大、工艺复杂、成桩质量难以把控、经济效益差的问题，且本发明所采用的预制桩在成桩后较短时间内即可承受荷载，可大幅缩短施工工期。
Construction method of precast pile group pile foundation in bead type karst cave stratum
The invention discloses a construction method of a precast pile group pile foundation in a bead-like karst cave stratum, and aims to solve the problems that the construction of a large-diameter single pile foundation in the bead-like karst cave stratum is difficult and high in cost, but if a shallow karst cave spacing board meets the requirements of medium and small-diameter piles on the thickness of a bearing layer, the precast pile (such as a tubular pile) group pile foundation can be designed and adopted; before construction, rubber rings are additionally arranged at two positions of a precast pile body, and the rubber rings are inflated and pressurized for the first time; a bearing platform foundation pit is excavated, and the position of a foundation pile is measured; drilling to a certain depth of the spacing board at the pile position by adopting a cast-in-situ bored pile steel casing follow-up method, and completing hole cleaning; according to the construction method, the small-and-medium-diameter tubular pile group is adopted to replace a single large-diameter cast-in-place pile, the problems that a large-diameter single pile foundation is large in construction depth, complex in process, difficult to control in pile forming quality and poor in economic benefit are solved, the adopted precast piles can bear loads within a short time after being formed, and the construction efficiency is improved. And the construction period can be greatly shortened.
本发明公开了一种串珠型溶洞地层中预制桩群桩基础的施工方法，串珠状溶洞地层中施工大直径单桩基础难度大、造价高，但如浅层溶洞间隔板满足中小直径桩对持力层厚度要求，则可设计采用预制桩(如管桩)群桩基础，施工前在预制桩桩身上两处加装橡胶圈，并对橡胶圈进行初次充气加压；开挖承台基坑，并放测基桩位置；在桩位处采用钻孔灌注桩钢护筒跟进法钻至间隔板一定深度并完成清孔；在钢护筒内下放预制桩，本发明通过采用中小直径管桩群桩代替单根大直径灌注桩，避免了大直径单桩基础施工深度大、工艺复杂、成桩质量难以把控、经济效益差的问题，且本发明所采用的预制桩在成桩后较短时间内即可承受荷载，可大幅缩短施工工期。
Construction method of precast pile group pile foundation in bead type karst cave stratum
一种串珠型溶洞地层中预制桩群桩基础的施工方法
2023-07-18
Patent
Electronic Resource
Chinese
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