LOCK BOLT AND CONSTRUCTION METHOD THEREOF
PROBLEM TO BE SOLVED: To provide an expansion type lock bolt for preventing slipping-out of an outer pipe, and capable of providing stable fixation force regardless of a natural ground property.SOLUTION: The present invention is a lock bolt fixed to a drilled hole formed in the natural ground, and c...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide an expansion type lock bolt for preventing slipping-out of an outer pipe, and capable of providing stable fixation force regardless of a natural ground property.SOLUTION: The present invention is a lock bolt fixed to a drilled hole formed in the natural ground, and comprises an expansion type pipe formed in a cylindrical shape, having an inside space of extending in the axial direction and expanding by being plastically deformed by injecting a pressurized fluid into the inside space, and a hollow outer pipe having an outer diameter corresponding to an inner diameter of the drilled hole, capable of inserting the expansion type pipe and diametrically expandable in the radial direction, and is constituted so as to regulate the movement to the base end part side of the outer pipe by engaging a movement part with a drilled hole inner wall surface by moving outward in the radial direction by providing at least one movement part movable outward in the radial direction in the outer pipe, and is constituted so as to move outward in the radial direction by pressing the movement part by the inserted expansion type pipe.SELECTED DRAWING: Figure 5
【課題】外管の抜け出しを防止すると共に、地山性状にかかわらず、安定的な定着力を得ることができる膨張式ロックボルトを提供する。【解決手段】本発明は、地山に形成された削孔に定着されるロックボルトであって、筒状に形成され、軸方向に延びる内部空間を有するとともに、前記内部空間に加圧流体を注入することで、塑性変形して膨張する膨張式管と、削孔の内径と対応する外径を有するとともに、膨張式管が挿入可能となっており、径方向に拡径可能な中空の外管と、を備え、外管には、径方向外方へ移動可能な少なくとも1つの移動部が設けられており、移動部が、径方向外方へ移動して削孔内壁面に係合することで、当該外管の基端部側への移動を規制するように構成され、移動部は、挿入された膨張式管によって押圧されることで、径方向外方に移動するように構成されている。【選択図】図5 |
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