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A platform for research: civil engineering, architecture and urbanism
SCP spiral row soil squeezing drilling tool and pile forming method
The invention relates to the field of foundation treatment in the building industry, in particular to an SCP spiral displacement soil pile drilling tool and a pile forming method. When the compaction is carried out for the first time in the downward drilling process, according to different geological conditions, the volume of discharged soil is 70-90% of the volume of a hole-forming pile body, the value is generally low when the soil around the pile under the ground layer condition is an unsaturated soil layer, and the value is large when the soil around the pile is saturated soft soil, and the compaction degree of the ground layer is high. A soil body around a hole, which accounts for 10-30% of the volume of a reserved pile body, is fully extruded to the periphery of the hole by a lower extruding and expanding body to serve as a compaction reinforcing structure of a hole wall; and when the drilling tool is lifted, the rebounded soil body is compacted again by the drilling tool. The pile foundation bearing capacity can be improved, and the soil squeezing effect of the pile and the composite foundation can be avoided.
本发明涉及建筑业地基处理领域，特涉及一种SCP螺旋排挤土桩钻具及成桩方法。本发明下钻首次挤密时，可根据地质情况的不同，其排土为成孔桩体体积的70~90%，当地层条件的桩周土为非饱和土层时一般取低值，当桩周土为饱和软土时，地层密实程度高的取大值。其预留桩体体积的10~30%孔周土体被下挤扩体充分地向孔周挤压，作为孔壁的挤密增强构造；提钻时钻具对回弹的土体进行再次挤密。本发明解决既能提高桩基承载力，又能规避桩及复合地基的挤土效应问题。
SCP spiral row soil squeezing drilling tool and pile forming method
The invention relates to the field of foundation treatment in the building industry, in particular to an SCP spiral displacement soil pile drilling tool and a pile forming method. When the compaction is carried out for the first time in the downward drilling process, according to different geological conditions, the volume of discharged soil is 70-90% of the volume of a hole-forming pile body, the value is generally low when the soil around the pile under the ground layer condition is an unsaturated soil layer, and the value is large when the soil around the pile is saturated soft soil, and the compaction degree of the ground layer is high. A soil body around a hole, which accounts for 10-30% of the volume of a reserved pile body, is fully extruded to the periphery of the hole by a lower extruding and expanding body to serve as a compaction reinforcing structure of a hole wall; and when the drilling tool is lifted, the rebounded soil body is compacted again by the drilling tool. The pile foundation bearing capacity can be improved, and the soil squeezing effect of the pile and the composite foundation can be avoided.
本发明涉及建筑业地基处理领域，特涉及一种SCP螺旋排挤土桩钻具及成桩方法。本发明下钻首次挤密时，可根据地质情况的不同，其排土为成孔桩体体积的70~90%，当地层条件的桩周土为非饱和土层时一般取低值，当桩周土为饱和软土时，地层密实程度高的取大值。其预留桩体体积的10~30%孔周土体被下挤扩体充分地向孔周挤压，作为孔壁的挤密增强构造；提钻时钻具对回弹的土体进行再次挤密。本发明解决既能提高桩基承载力，又能规避桩及复合地基的挤土效应问题。
SCP spiral row soil squeezing drilling tool and pile forming method
一种SCP螺旋排挤土钻具及成桩方法
GUO KECHENG (author) / WANG XIANGMIN (author) / SUN WEI (author)
2023-03-03
Patent
Electronic Resource
Chinese
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