METHOD FOR REINFORCING HOLE WALL FOR CONSTRUCTION OF CAST-IN-PLACE CONCRETE PILE

PROBLEM TO BE SOLVED: To provide a method for reinforcing a hole wall for construction of a cast-in-place concrete pile, which enables horizontal ground reaction of the pile to be reliably secured when the cast-in-place concrete pile is constructed in weak stratum ground.SOLUTION: A reinforcement ca...

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1. Verfasser: TOYOSHIMA TORU
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a method for reinforcing a hole wall for construction of a cast-in-place concrete pile, which enables horizontal ground reaction of the pile to be reliably secured when the cast-in-place concrete pile is constructed in weak stratum ground.SOLUTION: A reinforcement cage 3 attached in the state of having an outer periphery covered with a water-permeable net 5 is erected in a pile hole 2. Concrete 4 is placed in the net 5. A hole wall is reinforced by infilling a grout material 9 into a collapsed part A, which appears in the hole wall of the pile hole 2, via an injection pipe 10 inserted into the inside of the water-permeable net 5 along the reinforcement cage 3. Soil cement or fluidization-treated soil is used as the grout material 9. A steel pipe or a polyvinyl chloride pipe is used as the injection pipe 10. 【課題】軟弱層地盤における場所打ちコンクリート杭の施工に際し、杭の水平地盤反力を確実に確保できるようにした場所打ちコンクリート杭の施工における孔壁の補強方法を提供する。【解決手段】外周に透水性のネット5を被着した鉄筋かご3を杭孔2内に建て込む。ネット5内にコンクリート4を打設する。鉄筋かご3に添わせて透水性のネット5の内側に挿入した注入管10を介して杭孔2の孔壁に生じた崩壊部A内にグラウト材9を充填することにより孔壁を補強する。グラウト材9にはソイルセメントまたは流動化処理土を用いる。注入管10には鋼管または塩ビ管を用いる。【選択図】図1