Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Rotary drilling pile foundation construction method for aeolian sand and gravel-cobble combined stratum
The invention discloses a rotary drilling pile foundation construction method for a aeolian sand and gravel-cobble combined stratum. The rotary drilling pile foundation construction method comprises the steps of drilling machine in place, covering layer drilling, rock stratum inner drilling and pebble bed drilling, specifically, covering layer drilling is conducted, a cutting edge at the lower endof a drill bit is used for cutting and crushing a soil layer, a cut soil body is extruded into a drilling bucket, the drilling bucket is lifted out of a hole opening after being filled, a chassis ofthe drilling machine is rotated, then reversing is carried out, a drilling bucket valve is opened, and the soil body is discharged to the ground; an outer cutting knife is mounted at the lower part ofthe drill bit, so that a certain gap is reserved between the drill bit and the hole wall, and the hole wall is prevented from collapsing due to vacuum caused by pumping action during drill lifting; and drilling in the rock stratum is performed by adopting a secondary reaming process. According to the rotary drilling pile foundation construction method for the aeolian sand and gravel-cobble combined stratum, the technical problems that due to the fact that a thick sand layer and gravel-cobble exist a stratum in an aeolian sand stratum area, and the stability of a foundation is poor, a conventional large-diameter cast-in-situ bored pile scheme is adopted for construction, hole forming of the pile foundation is likely to be caused, and the pouring quality and safety risk are high are solved.
本发明申请公开了一种风积沙、砂卵砾石结合地层的旋挖钻桩基施工方法，包括钻机就位、覆盖层钻进、岩层内钻进和卵石层钻进，其中，覆盖层钻进，利用钻头下端的切削刃对土层进行切削破碎，切削的土体被挤进钻斗，装满后将钻斗提出孔口，旋转钻机底盘然后反转，并开启钻斗阀门，将土体排放到地面；钻头下部装有外切削刀，使钻头与孔壁之间留有一定间隙，防止提钻时产生抽吸作用，造成真空，使孔壁坍塌；岩层内钻进采用采用二次扩孔工艺钻进。本发明申请解决了由于风积沙地层区域，地层中均存在较厚的砂层、卵砾石，地基自身稳定性较差，导致采用常规的大直径钻孔灌注桩方案进行施工，容易造成桩基成孔、浇筑质量和安全风险较高的技术问题。
Rotary drilling pile foundation construction method for aeolian sand and gravel-cobble combined stratum
The invention discloses a rotary drilling pile foundation construction method for a aeolian sand and gravel-cobble combined stratum. The rotary drilling pile foundation construction method comprises the steps of drilling machine in place, covering layer drilling, rock stratum inner drilling and pebble bed drilling, specifically, covering layer drilling is conducted, a cutting edge at the lower endof a drill bit is used for cutting and crushing a soil layer, a cut soil body is extruded into a drilling bucket, the drilling bucket is lifted out of a hole opening after being filled, a chassis ofthe drilling machine is rotated, then reversing is carried out, a drilling bucket valve is opened, and the soil body is discharged to the ground; an outer cutting knife is mounted at the lower part ofthe drill bit, so that a certain gap is reserved between the drill bit and the hole wall, and the hole wall is prevented from collapsing due to vacuum caused by pumping action during drill lifting; and drilling in the rock stratum is performed by adopting a secondary reaming process. According to the rotary drilling pile foundation construction method for the aeolian sand and gravel-cobble combined stratum, the technical problems that due to the fact that a thick sand layer and gravel-cobble exist a stratum in an aeolian sand stratum area, and the stability of a foundation is poor, a conventional large-diameter cast-in-situ bored pile scheme is adopted for construction, hole forming of the pile foundation is likely to be caused, and the pouring quality and safety risk are high are solved.
本发明申请公开了一种风积沙、砂卵砾石结合地层的旋挖钻桩基施工方法，包括钻机就位、覆盖层钻进、岩层内钻进和卵石层钻进，其中，覆盖层钻进，利用钻头下端的切削刃对土层进行切削破碎，切削的土体被挤进钻斗，装满后将钻斗提出孔口，旋转钻机底盘然后反转，并开启钻斗阀门，将土体排放到地面；钻头下部装有外切削刀，使钻头与孔壁之间留有一定间隙，防止提钻时产生抽吸作用，造成真空，使孔壁坍塌；岩层内钻进采用采用二次扩孔工艺钻进。本发明申请解决了由于风积沙地层区域，地层中均存在较厚的砂层、卵砾石，地基自身稳定性较差，导致采用常规的大直径钻孔灌注桩方案进行施工，容易造成桩基成孔、浇筑质量和安全风险较高的技术问题。
Rotary drilling pile foundation construction method for aeolian sand and gravel-cobble combined stratum
风积沙、砂卵砾石结合地层的旋挖钻桩基施工方法
TANG CHENGLONG (Autor:in) / WANG YUJIE (Autor:in) / ZHANG ZHENG (Autor:in) / BU WENMIN (Autor:in) / YU ZHAOHUI (Autor:in)
06.11.2020
Patent
Elektronische Ressource
Chinesisch
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