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Large-diameter onshore four-shaft mixing pile construction method
A construction method for a large-diameter onshore four-shaft mixing pile is discloses. The relation between the designed embedded layer top elevation and the drilling current and change characteristics of a mixing pile machine is established through trial insertion, and the actual embedded layer top elevation is judged by referring to the designed embedded layer top elevation and the drilling current value in the construction process; the influence of factors such as the thickness of an embedded soil layer, the length of a slurry conveying pipeline, a stirring drill bit and the cutting frequency of a pile bottom on the construction process is considered, and slurry in the slurry conveying pipeline is fully utilized; and the construction technology provides improvement measures and reinforcement measures for weak quality positions such as the upper and lower guniting lap joint position, the pile bottom and the pile top of the mixing pile. The scheme has the advantages of being high in construction speed, good in strength uniformity, relatively high in bearing capacity and controllable in construction quality, the theoretical slurry loss amount of the construction technology is greatly reduced, the slurry return amount in the construction process is small, resource loss is reduced, it can be effectively ensured that the pile bottom enters an embedded layer, and the applicability of the mixing pile under complex engineering geological conditions is improved.
一种大直径陆上四轴搅拌桩施工方法，通过试插建立了设计嵌入层顶标高与搅拌桩机下钻电流及其变化特征的关系，施工过程中参考设计嵌入层顶标高和下钻电流值判定实际的嵌入层顶标高；考虑了嵌入土层的厚度、输浆管线的长度、搅拌钻头、桩底的切割次数等因素对施工工艺的影响，并充分利用了输浆管线中的浆液；针对搅拌桩上下喷浆搭接处、桩底和桩顶等质量薄弱位置，施工工艺提出了改进措施和加强措施。本方案具有施工速度快，强度均匀性好，承载力相对较高和施工质量可控的优势，大幅减少了施工工艺本身理论的浆液损耗量，施工过程中返浆量少，降低了资源的损耗，能有效确保桩底进入嵌入层，提高了搅拌桩在复杂工程地质条件下的适用性。
Large-diameter onshore four-shaft mixing pile construction method
A construction method for a large-diameter onshore four-shaft mixing pile is discloses. The relation between the designed embedded layer top elevation and the drilling current and change characteristics of a mixing pile machine is established through trial insertion, and the actual embedded layer top elevation is judged by referring to the designed embedded layer top elevation and the drilling current value in the construction process; the influence of factors such as the thickness of an embedded soil layer, the length of a slurry conveying pipeline, a stirring drill bit and the cutting frequency of a pile bottom on the construction process is considered, and slurry in the slurry conveying pipeline is fully utilized; and the construction technology provides improvement measures and reinforcement measures for weak quality positions such as the upper and lower guniting lap joint position, the pile bottom and the pile top of the mixing pile. The scheme has the advantages of being high in construction speed, good in strength uniformity, relatively high in bearing capacity and controllable in construction quality, the theoretical slurry loss amount of the construction technology is greatly reduced, the slurry return amount in the construction process is small, resource loss is reduced, it can be effectively ensured that the pile bottom enters an embedded layer, and the applicability of the mixing pile under complex engineering geological conditions is improved.
一种大直径陆上四轴搅拌桩施工方法，通过试插建立了设计嵌入层顶标高与搅拌桩机下钻电流及其变化特征的关系，施工过程中参考设计嵌入层顶标高和下钻电流值判定实际的嵌入层顶标高；考虑了嵌入土层的厚度、输浆管线的长度、搅拌钻头、桩底的切割次数等因素对施工工艺的影响，并充分利用了输浆管线中的浆液；针对搅拌桩上下喷浆搭接处、桩底和桩顶等质量薄弱位置，施工工艺提出了改进措施和加强措施。本方案具有施工速度快，强度均匀性好，承载力相对较高和施工质量可控的优势，大幅减少了施工工艺本身理论的浆液损耗量，施工过程中返浆量少，降低了资源的损耗，能有效确保桩底进入嵌入层，提高了搅拌桩在复杂工程地质条件下的适用性。
Large-diameter onshore four-shaft mixing pile construction method
一种大直径陆上四轴搅拌桩施工方法
ZHENG SHAOHE (author) / CHEN YUE (author) / ZHOU XIAOKE (author) / FENG LIANG (author)
2022-02-01
Patent
Electronic Resource
Chinese
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