A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
To provide a restoration method of subsoil capable of achieving restoration of an original condition at low cost, while suppressing an influence on a peripheral environment, after a columnar improvement part is constructed by a soil cement column construction method.SOLUTION: In order to achieve a restoration method of a subsoil G, an excavation drill 11 is used for crushing a columnar improvement part C. The excavation drill 11 includes a plurality of spiral blade tools 16 surrounding a side peripheral surface of a central shaft 15, and in the neighborhood of an outer peripheral part of the blade tools 16, a rod-like diameter expanding claw 22 is mounted so as to oscillate. Then, when the central shaft 15 rotates normally, the diameter expanding claw 22 is lodged in the circumferential direction, and when the central shaft 15 rotates reversely, the diameter expanding claw 22 rotates in the radial direction. Furthermore, the diameter of the blade tool 16 is smaller than the diameter of the columnar improvement part C, and the diameter when the diameter expanding claw 22 protrudes is larger than the diameter of the columnar improvement part C. By crushing the columnar improvement part C stepwise, the torque for driving the excavation drill 11 is alleviated, and suppression in energy consumption and reduction in noise are achieved, and miniaturization of the machine can facilitate transportation.SELECTED DRAWING: Figure 1
【課題】ソイルセメントコラム工法による柱状改良部が構築された後、周辺環境に及ぼす影響を抑制しながら、低コストで原状回復を実現可能な地盤の復元方法を提供する。【解決手段】地盤Ｇの復元方法を実現するため、柱状改良部Ｃを破砕する掘削ドリル１１を用いる。掘削ドリル１１は、中心軸１５の側周面を取り囲む螺旋状の刃具１６を複数備え、刃具１６の外周部近傍には棒状の拡径爪２２を揺動自在に取り付けてある。そして中心軸１５が正転する際は拡径爪２２が周方向に倒伏し、中心軸１５が逆転する際は拡径爪２２が半径方向に突出する。さらに刃具１６の直径は、柱状改良部Ｃの直径よりも小さいほか、拡径爪２２が突出した際の直径は、柱状改良部Ｃの直径よりも大きく、柱状改良部Ｃを段階的に破砕することで掘削ドリル１１を駆動するトルクが軽減され、エネルギー消費の抑制や騒音の低下が実現するほか、機材を小型化でき輸送などが容易になる。【選択図】図１
To provide a restoration method of subsoil capable of achieving restoration of an original condition at low cost, while suppressing an influence on a peripheral environment, after a columnar improvement part is constructed by a soil cement column construction method.SOLUTION: In order to achieve a restoration method of a subsoil G, an excavation drill 11 is used for crushing a columnar improvement part C. The excavation drill 11 includes a plurality of spiral blade tools 16 surrounding a side peripheral surface of a central shaft 15, and in the neighborhood of an outer peripheral part of the blade tools 16, a rod-like diameter expanding claw 22 is mounted so as to oscillate. Then, when the central shaft 15 rotates normally, the diameter expanding claw 22 is lodged in the circumferential direction, and when the central shaft 15 rotates reversely, the diameter expanding claw 22 rotates in the radial direction. Furthermore, the diameter of the blade tool 16 is smaller than the diameter of the columnar improvement part C, and the diameter when the diameter expanding claw 22 protrudes is larger than the diameter of the columnar improvement part C. By crushing the columnar improvement part C stepwise, the torque for driving the excavation drill 11 is alleviated, and suppression in energy consumption and reduction in noise are achieved, and miniaturization of the machine can facilitate transportation.SELECTED DRAWING: Figure 1
【課題】ソイルセメントコラム工法による柱状改良部が構築された後、周辺環境に及ぼす影響を抑制しながら、低コストで原状回復を実現可能な地盤の復元方法を提供する。【解決手段】地盤Ｇの復元方法を実現するため、柱状改良部Ｃを破砕する掘削ドリル１１を用いる。掘削ドリル１１は、中心軸１５の側周面を取り囲む螺旋状の刃具１６を複数備え、刃具１６の外周部近傍には棒状の拡径爪２２を揺動自在に取り付けてある。そして中心軸１５が正転する際は拡径爪２２が周方向に倒伏し、中心軸１５が逆転する際は拡径爪２２が半径方向に突出する。さらに刃具１６の直径は、柱状改良部Ｃの直径よりも小さいほか、拡径爪２２が突出した際の直径は、柱状改良部Ｃの直径よりも大きく、柱状改良部Ｃを段階的に破砕することで掘削ドリル１１を駆動するトルクが軽減され、エネルギー消費の抑制や騒音の低下が実現するほか、機材を小型化でき輸送などが容易になる。【選択図】図１
RESTORATION METHOD OF SUBSOIL
地盤の復元方法
ORITO SEIJI (author)
2020-12-10
Patent
Electronic Resource
Japanese
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