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A platform for research: civil engineering, architecture and urbanism
Construction method of cast-in-situ bored pile for water-rich sandy stratum
The invention relates to a construction method of a cast-in-situ bored pile for a water-rich sandy stratum. The method includes the steps of site cleaning: a drilling machine is moved to a construction site to be prepared in place; hole guiding by the drilling machine: the drilling machine is used to drill a first-stage guide hole, and hole bottoms and hole walls are cleaned; pile casing sinking: a pile casing is placed in the guide hole to the bottom of the guide hole; hole forming by the drilling machine: the drilling machine is in place again after a drill bit is replaced, and drilling is conducted to a designed pile bottom elevation; reinforcement cage mounting: a manufactured reinforcement cage is put into the hole, and the reinforcement cage is mounted in sections; concrete pouring: concrete is poured into the hole through a guide pipe; and pile casing pulling-out: the pile casting is pulled out through mechanical equipment, in the pile casing pulling-out process, constant-speed operation needs to be conducted, and pile casing pulling-out needs to be kept vertical and is completed under the command of constructors, so that the pile casing perpendicularity is guaranteed. According to the construction method of the cast-in-situ bored pile for the water-rich sandy stratum, the full-length steel pile casing is adopted for wall protection, and bentonite or chemical slurry is not adopted for wall protection in the drilling process, so that hole collapse and hole shrinkage can be effectively avoided, the pile forming quality is improved, and meanwhile pollution to underground water is avoided.
本申请涉及一种富水砂质地层钻孔灌注桩施工方法，步骤如下：清理现场，钻机移动到施工地点就位准备；钻机引孔，使用钻机下钻第一阶段引孔，清理孔底及孔壁；护筒下沉，将护筒放置在引孔中，至引孔底部；钻机成孔，钻机更换钻头后重新就位，施钻至设计桩底标高；钢筋笼安装，将制作好的钢筋笼下放至孔内，钢筋笼分节安装；混凝土灌注，通过导管向孔内灌注混凝土；拔出护筒，通过机械设备拔出护筒，拔出护筒过程中，应匀速操作，护筒拔出应保持垂直，在施工人员指挥下完成，保证护筒垂直度。本申请采用全长钢护筒进行护壁，钻孔过程中不采用膨润土或化学泥浆护壁，可以有效避免塌孔、缩孔，提高成桩质量的同时，不会对地下水造成污染。
Construction method of cast-in-situ bored pile for water-rich sandy stratum
The invention relates to a construction method of a cast-in-situ bored pile for a water-rich sandy stratum. The method includes the steps of site cleaning: a drilling machine is moved to a construction site to be prepared in place; hole guiding by the drilling machine: the drilling machine is used to drill a first-stage guide hole, and hole bottoms and hole walls are cleaned; pile casing sinking: a pile casing is placed in the guide hole to the bottom of the guide hole; hole forming by the drilling machine: the drilling machine is in place again after a drill bit is replaced, and drilling is conducted to a designed pile bottom elevation; reinforcement cage mounting: a manufactured reinforcement cage is put into the hole, and the reinforcement cage is mounted in sections; concrete pouring: concrete is poured into the hole through a guide pipe; and pile casing pulling-out: the pile casting is pulled out through mechanical equipment, in the pile casing pulling-out process, constant-speed operation needs to be conducted, and pile casing pulling-out needs to be kept vertical and is completed under the command of constructors, so that the pile casing perpendicularity is guaranteed. According to the construction method of the cast-in-situ bored pile for the water-rich sandy stratum, the full-length steel pile casing is adopted for wall protection, and bentonite or chemical slurry is not adopted for wall protection in the drilling process, so that hole collapse and hole shrinkage can be effectively avoided, the pile forming quality is improved, and meanwhile pollution to underground water is avoided.
本申请涉及一种富水砂质地层钻孔灌注桩施工方法，步骤如下：清理现场，钻机移动到施工地点就位准备；钻机引孔，使用钻机下钻第一阶段引孔，清理孔底及孔壁；护筒下沉，将护筒放置在引孔中，至引孔底部；钻机成孔，钻机更换钻头后重新就位，施钻至设计桩底标高；钢筋笼安装，将制作好的钢筋笼下放至孔内，钢筋笼分节安装；混凝土灌注，通过导管向孔内灌注混凝土；拔出护筒，通过机械设备拔出护筒，拔出护筒过程中，应匀速操作，护筒拔出应保持垂直，在施工人员指挥下完成，保证护筒垂直度。本申请采用全长钢护筒进行护壁，钻孔过程中不采用膨润土或化学泥浆护壁，可以有效避免塌孔、缩孔，提高成桩质量的同时，不会对地下水造成污染。
Construction method of cast-in-situ bored pile for water-rich sandy stratum
一种富水砂质地层钻孔灌注桩施工方法
QIAN FULIN (author) / LIU HAIRONG (author) / ZHANG JIE (author) / YU CHAOCAI (author) / ZHENG CHANGJUN (author)
2021-04-16
Patent
Electronic Resource
Chinese
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