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Large-diameter long pile combined hole forming construction method under super-thick hard rock condition
According to the large-diameter long pile combined hole forming construction method under the super-thick hard rock condition, the rock drilling capacity of a drilling machine is improved through the rotary drilling machine with the large axial pressure and the large output torque, a large-diameter down-the-hole hammer is used for coring in the first-stage drilling process, the integrity of a rock stratum is damaged, a free face is created for broaching of a cutting tooth drill of the multi-stage rotary drilling machine, the drilling speed is increased, and the drilling efficiency is improved. The efficiency of a drilling machine is improved, drill bit abrasion is reduced, and the problem that hard rock has large lateral constraint on a drilling tool when a conventional rotary drilling bit drills from the center of a pile is solved. And then the diameter of the drill hole is gradually enlarged in a relay mode through a rotary drilling rig pick drill till drilling reaches the designed pile diameter, so that it is guaranteed that power and torque of the drilling rig are transmitted to a rotary drilling bit to the maximum extent. Meanwhile, based on the characteristics that the hard rock stratum is good in stability and the wall of a drilled hole is stable, clear water drilling is adopted, a construction site is easy to maintain, civilized construction is easy to ensure, and pollution to a reservoir is avoided.
本发明提供了一种超厚硬岩条件大直径长桩组合成孔施工方法，通过轴向压力及输出扭矩大的旋挖钻机，提高钻机钻岩能力，并在首级钻进利用大直径潜孔锤取芯，破坏岩层的整体性，为多级旋挖钻机截齿钻扩孔创造临空面，加快钻进速度，提高钻机效率，减少钻头磨损，解决常规旋挖钻头从桩中心处钻入，硬岩对钻具侧向约束大的难题。再以旋挖钻机截齿钻接力逐级扩大钻孔直径，直至钻进达到设计桩径，以保证钻机的动力和扭矩最大限度地传递至旋挖钻头。与此同时，基于硬质岩层稳定性好，钻孔孔壁稳定的特点，采用清水钻进，施工场地易维护，文明施工易确保，避免对水库的污染。
Large-diameter long pile combined hole forming construction method under super-thick hard rock condition
According to the large-diameter long pile combined hole forming construction method under the super-thick hard rock condition, the rock drilling capacity of a drilling machine is improved through the rotary drilling machine with the large axial pressure and the large output torque, a large-diameter down-the-hole hammer is used for coring in the first-stage drilling process, the integrity of a rock stratum is damaged, a free face is created for broaching of a cutting tooth drill of the multi-stage rotary drilling machine, the drilling speed is increased, and the drilling efficiency is improved. The efficiency of a drilling machine is improved, drill bit abrasion is reduced, and the problem that hard rock has large lateral constraint on a drilling tool when a conventional rotary drilling bit drills from the center of a pile is solved. And then the diameter of the drill hole is gradually enlarged in a relay mode through a rotary drilling rig pick drill till drilling reaches the designed pile diameter, so that it is guaranteed that power and torque of the drilling rig are transmitted to a rotary drilling bit to the maximum extent. Meanwhile, based on the characteristics that the hard rock stratum is good in stability and the wall of a drilled hole is stable, clear water drilling is adopted, a construction site is easy to maintain, civilized construction is easy to ensure, and pollution to a reservoir is avoided.
本发明提供了一种超厚硬岩条件大直径长桩组合成孔施工方法，通过轴向压力及输出扭矩大的旋挖钻机，提高钻机钻岩能力，并在首级钻进利用大直径潜孔锤取芯，破坏岩层的整体性，为多级旋挖钻机截齿钻扩孔创造临空面，加快钻进速度，提高钻机效率，减少钻头磨损，解决常规旋挖钻头从桩中心处钻入，硬岩对钻具侧向约束大的难题。再以旋挖钻机截齿钻接力逐级扩大钻孔直径，直至钻进达到设计桩径，以保证钻机的动力和扭矩最大限度地传递至旋挖钻头。与此同时，基于硬质岩层稳定性好，钻孔孔壁稳定的特点，采用清水钻进，施工场地易维护，文明施工易确保，避免对水库的污染。
Large-diameter long pile combined hole forming construction method under super-thick hard rock condition
一种超厚硬岩条件大直径长桩组合成孔施工方法
LIU NINGBO (author) / CHEN CHENG (author) / ZHOU SHU (author) / ZHANG ZHAOCHUAN (author) / ZHANG YINGFEI (author) / AN CHENHUI (author) / KANG YANSHENG (author) / LI DONGWEI (author) / WANG WULEI (author)
2023-06-06
Patent
Electronic Resource
Chinese
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