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ROTARY PENETRATION PILE, AND CONSTRUCTION METHOD FOR CONSOLIDATED FOUNDATION USING THE ROTARY PENETRATION PILE
PROBLEM TO BE SOLVED: To provide a rotary penetration pile and a construction method for a consolidated foundation that enhance load bearing capacity of the pile and enable confirmation on protrusion of an expanded excavation blade in a ground from a periphery of a spiral vane.SOLUTION: A rotary penetration pile includes: a pile body 10 having a steel outer tube 11 and a steel inner tube 12 fitted inside of the outer tube at a tip part, with an edge of the inner tube closed by a bottom cover 13 exposed from the outer tube; a spiral vane 20 wound almost once on a peripheral surface of the inner tube; two expanded excavation blades 30 fitted on the spiral vane, the expanded excavation blades being open by 180° in a circumferential direction of the spiral blade and protruding outward in a radial direction of the pile body; and an injection nozzle 40 for curable fluid disposed on the peripheral surface of the inner tube. Detection is made possible of protrusion of the expanded excavation blade in the radial direction of the pile body from the periphery of the spiral vane, by an upward movement in an axial direction of the outer tube while rotating when rotation of the pile body in a reverse direction starts underground.SELECTED DRAWING: Figure 1
【課題】杭の支持力を増加させることが出来る上に、地盤中で拡大掘削刃が螺旋翼の周縁から突出していることを確認することが出来る、回転貫入杭及び根固めされた基礎の施工方法を提供することを目的とする。【解決手段】鋼管製の外筒１１と、底蓋１３で閉塞された先端が該外筒から露出した状態で該外筒の先端部分内に配置される鋼管製の内筒１２を有する杭本体１０と、内筒の周面に設けられた略一巻の螺旋翼２０と、螺旋翼にその周方向に１８０°の開き角度をあけて杭本体の径方向外側に突出可能に設けられた２枚の拡大掘削刃３０と、内筒の周面に設けられた硬化性流動体の噴出口４０と、を備え、地盤中で杭本体を逆回転させたとき、その回転初期時に外筒が内筒に対して回転しつつ軸方向上方に移動することを利用して拡大掘削刃が螺旋翼の周縁から杭本体の径方向外側に突出したのを検知する。【選択図】図１
ROTARY PENETRATION PILE, AND CONSTRUCTION METHOD FOR CONSOLIDATED FOUNDATION USING THE ROTARY PENETRATION PILE
PROBLEM TO BE SOLVED: To provide a rotary penetration pile and a construction method for a consolidated foundation that enhance load bearing capacity of the pile and enable confirmation on protrusion of an expanded excavation blade in a ground from a periphery of a spiral vane.SOLUTION: A rotary penetration pile includes: a pile body 10 having a steel outer tube 11 and a steel inner tube 12 fitted inside of the outer tube at a tip part, with an edge of the inner tube closed by a bottom cover 13 exposed from the outer tube; a spiral vane 20 wound almost once on a peripheral surface of the inner tube; two expanded excavation blades 30 fitted on the spiral vane, the expanded excavation blades being open by 180° in a circumferential direction of the spiral blade and protruding outward in a radial direction of the pile body; and an injection nozzle 40 for curable fluid disposed on the peripheral surface of the inner tube. Detection is made possible of protrusion of the expanded excavation blade in the radial direction of the pile body from the periphery of the spiral vane, by an upward movement in an axial direction of the outer tube while rotating when rotation of the pile body in a reverse direction starts underground.SELECTED DRAWING: Figure 1
【課題】杭の支持力を増加させることが出来る上に、地盤中で拡大掘削刃が螺旋翼の周縁から突出していることを確認することが出来る、回転貫入杭及び根固めされた基礎の施工方法を提供することを目的とする。【解決手段】鋼管製の外筒１１と、底蓋１３で閉塞された先端が該外筒から露出した状態で該外筒の先端部分内に配置される鋼管製の内筒１２を有する杭本体１０と、内筒の周面に設けられた略一巻の螺旋翼２０と、螺旋翼にその周方向に１８０°の開き角度をあけて杭本体の径方向外側に突出可能に設けられた２枚の拡大掘削刃３０と、内筒の周面に設けられた硬化性流動体の噴出口４０と、を備え、地盤中で杭本体を逆回転させたとき、その回転初期時に外筒が内筒に対して回転しつつ軸方向上方に移動することを利用して拡大掘削刃が螺旋翼の周縁から杭本体の径方向外側に突出したのを検知する。【選択図】図１
ROTARY PENETRATION PILE, AND CONSTRUCTION METHOD FOR CONSOLIDATED FOUNDATION USING THE ROTARY PENETRATION PILE
回転貫入杭及び回転貫入杭を使用する根固めされた基礎の施工方法
YOSHIDA YASUYUKI (author) / KOBAYASHI TOYOHIKO (author) / SHINOHARA TOSHIO (author)
2016-05-12
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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