A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
ROTARY PRESS-IN STEEL PIPE PILE
PROBLEM TO BE SOLVED: To provide a rotary press-in steel pipe pile with high workability and large bearing capacity, which can be smoothly penetrated in the ground.SOLUTION: A lower blade 3, which is formed into a spiral shape and has a first cutout 6 in substantially tapered shape between its tip and rear end, is fixed on an apical surface formed into spiral shape of a cylindrical steel pipe 2 in a rotary press-in steel pipe pile 1. The inner diameter of the lower blade 3 protrudes inward to 1/2 of a tip opening of the steel pipe 2, while the outer diameter protrudes outward from the steel pipe 2. An upper blade 4 is fixed on a base end side of the lower blade 3 at an outer peripheral surface of the steel pipe 2. The upper blade 4 is spiral and has a diameter, which is more extended outward than that of the lower blade 3. A second cutout 9 in substantially tapered shape is formed between the tip and the rear end of the upper blade. The first cutout 6 of the lower blade 3 and the second cutout 9 of the upper blade 4 are respectively disposed at positions facing each other in circumferential direction of the steel pipe 2. A cutout angle β of the second cutout 9 is smaller than a cutout angle α of the first cutout 6 to increase bearing capacity. A ring-shaped closing plate is fixed inside the steel pipe 2 at a height of the upper blade 4 and a small hole is bored at a central part.SELECTED DRAWING: Figure 1
【課題】地盤にスムーズに貫入して施工性が高く、支持力が大きい。【解決手段】回転圧入鋼管杭１は、円筒状の鋼管２における螺旋状に形成した先端面に、螺旋状に形成されていてその先端と後端との間に略テーパ状の第一切欠６を形成した下羽根３を固定した。下羽根３の内径は鋼管２の先端開口の１／２まで内側に突出し、外径は鋼管２より外側に突出する。鋼管２の外周面における下羽根３の基端側に上羽根４を固定した。上羽根４は下羽根３よりも外側に拡径されていて螺旋状をなし、その先端と後端との間に略テーパ状の第二切欠９を形成した。下羽根３の第一切欠６と上羽根４の第二切欠９とは鋼管２の周方向に対向する位置にそれぞれ配設した。しかも第二切欠９の切欠角βは第一切欠６の切欠角αよりも小さく設定して支持力を大きくした。鋼管２の内部で上羽根４の高さには閉塞板をリング状に固定し、中央に小孔を設けた。【選択図】図１
ROTARY PRESS-IN STEEL PIPE PILE
PROBLEM TO BE SOLVED: To provide a rotary press-in steel pipe pile with high workability and large bearing capacity, which can be smoothly penetrated in the ground.SOLUTION: A lower blade 3, which is formed into a spiral shape and has a first cutout 6 in substantially tapered shape between its tip and rear end, is fixed on an apical surface formed into spiral shape of a cylindrical steel pipe 2 in a rotary press-in steel pipe pile 1. The inner diameter of the lower blade 3 protrudes inward to 1/2 of a tip opening of the steel pipe 2, while the outer diameter protrudes outward from the steel pipe 2. An upper blade 4 is fixed on a base end side of the lower blade 3 at an outer peripheral surface of the steel pipe 2. The upper blade 4 is spiral and has a diameter, which is more extended outward than that of the lower blade 3. A second cutout 9 in substantially tapered shape is formed between the tip and the rear end of the upper blade. The first cutout 6 of the lower blade 3 and the second cutout 9 of the upper blade 4 are respectively disposed at positions facing each other in circumferential direction of the steel pipe 2. A cutout angle β of the second cutout 9 is smaller than a cutout angle α of the first cutout 6 to increase bearing capacity. A ring-shaped closing plate is fixed inside the steel pipe 2 at a height of the upper blade 4 and a small hole is bored at a central part.SELECTED DRAWING: Figure 1
【課題】地盤にスムーズに貫入して施工性が高く、支持力が大きい。【解決手段】回転圧入鋼管杭１は、円筒状の鋼管２における螺旋状に形成した先端面に、螺旋状に形成されていてその先端と後端との間に略テーパ状の第一切欠６を形成した下羽根３を固定した。下羽根３の内径は鋼管２の先端開口の１／２まで内側に突出し、外径は鋼管２より外側に突出する。鋼管２の外周面における下羽根３の基端側に上羽根４を固定した。上羽根４は下羽根３よりも外側に拡径されていて螺旋状をなし、その先端と後端との間に略テーパ状の第二切欠９を形成した。下羽根３の第一切欠６と上羽根４の第二切欠９とは鋼管２の周方向に対向する位置にそれぞれ配設した。しかも第二切欠９の切欠角βは第一切欠６の切欠角αよりも小さく設定して支持力を大きくした。鋼管２の内部で上羽根４の高さには閉塞板をリング状に固定し、中央に小孔を設けた。【選択図】図１
ROTARY PRESS-IN STEEL PIPE PILE
回転圧入鋼管杭
NAKAZAWA KIMIHIRO (author) / WADA MASATOSHI (author) / SAWAISHI MASAMICHI (author) / MARUYAMA SAKAE (author) / SHOJI TOMOYUKI (author) / YAGISHITA NORIYOSHI (author) / SAWADA TAKESHI (author)
2016-05-16
Patent
Electronic Resource
Japanese
IPC:
E02D
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