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Construction method for grouting cast-in-place pile after dry drilling, soil squeezing and hole forming in hard stratum
The invention discloses a construction method for grouting a cast-in-place pile after dry drilling, soil squeezing and hole forming in a hard stratum. The construction method comprises the following steps: 1) moving a machine and positioning; (2) forward rotation, soil squeezing and downward drilling are conducted, specifically, a pile machine rotates forward, a drill bit cuts a hard stratum, cut muck is squeezed towards the periphery of a pile through a screw drill rod, and a small part of muck returns upwards out of the ground; (3) drilling to the elevation of a final hole; (4) pile core concrete is pumped and poured to the bottom of the hole by 1.5-2.5 m, after the final hole standard is met, concrete pumping operation is started to the bottom of the pile, and the pile is rotated forwards and lifted upwards by 1.5-2.5 m at a constant speed while concrete is pumped to the bottom of the pile; (5) forward rotation is conducted, downward re-drilling is conducted by 1.5 m to 2.5 m, and the final hole elevation is reached; according to the cast-in-place pile construction method, the problem that pile forming is difficult in a hard stratum is solved, the vertical compression resistance static load force of a single cast-in-place pile is large, and the occupancy rate of pile body completeness is high.
本发明公开了一种坚硬地层干钻挤土成孔后压浆灌注桩工法，包括步骤：1）、移机定位；2）、正向旋转挤土下钻：桩机正向旋转，钻头切割坚硬地层，切削下的渣土，通过螺杆钻杆向桩周挤压，少部分渣土向上返出地面；3）、钻至终孔标高；4）、孔底泵送浇筑桩芯砼1.5‑2.5m：满足终孔标准后，开始向桩底泵送混凝土作业，一边向桩底泵送混凝土，一边正向旋转并向上匀速提钻1.5‑2.5m高；5）、正向旋转向下复钻1.5‑2.5m至终孔标高；6）、正向旋转向上匀速提钻并泵送压浆浇筑桩芯砼；7）、辅助振动下钢筋笼；8）、成品保护并移机至下一桩位。本发明的灌注桩工法解决了坚硬地层成桩难的问题，而且本发明的灌注桩单桩竖向抗压静载力大，桩身完整的占有率高。
Construction method for grouting cast-in-place pile after dry drilling, soil squeezing and hole forming in hard stratum
The invention discloses a construction method for grouting a cast-in-place pile after dry drilling, soil squeezing and hole forming in a hard stratum. The construction method comprises the following steps: 1) moving a machine and positioning; (2) forward rotation, soil squeezing and downward drilling are conducted, specifically, a pile machine rotates forward, a drill bit cuts a hard stratum, cut muck is squeezed towards the periphery of a pile through a screw drill rod, and a small part of muck returns upwards out of the ground; (3) drilling to the elevation of a final hole; (4) pile core concrete is pumped and poured to the bottom of the hole by 1.5-2.5 m, after the final hole standard is met, concrete pumping operation is started to the bottom of the pile, and the pile is rotated forwards and lifted upwards by 1.5-2.5 m at a constant speed while concrete is pumped to the bottom of the pile; (5) forward rotation is conducted, downward re-drilling is conducted by 1.5 m to 2.5 m, and the final hole elevation is reached; according to the cast-in-place pile construction method, the problem that pile forming is difficult in a hard stratum is solved, the vertical compression resistance static load force of a single cast-in-place pile is large, and the occupancy rate of pile body completeness is high.
本发明公开了一种坚硬地层干钻挤土成孔后压浆灌注桩工法，包括步骤：1）、移机定位；2）、正向旋转挤土下钻：桩机正向旋转，钻头切割坚硬地层，切削下的渣土，通过螺杆钻杆向桩周挤压，少部分渣土向上返出地面；3）、钻至终孔标高；4）、孔底泵送浇筑桩芯砼1.5‑2.5m：满足终孔标准后，开始向桩底泵送混凝土作业，一边向桩底泵送混凝土，一边正向旋转并向上匀速提钻1.5‑2.5m高；5）、正向旋转向下复钻1.5‑2.5m至终孔标高；6）、正向旋转向上匀速提钻并泵送压浆浇筑桩芯砼；7）、辅助振动下钢筋笼；8）、成品保护并移机至下一桩位。本发明的灌注桩工法解决了坚硬地层成桩难的问题，而且本发明的灌注桩单桩竖向抗压静载力大，桩身完整的占有率高。
Construction method for grouting cast-in-place pile after dry drilling, soil squeezing and hole forming in hard stratum
坚硬地层干钻挤土成孔后压浆灌注桩工法
DU FUZHI (author) / GAO BAIHUI (author)
2022-05-06
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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