LOCK BOLT

• Main Authors: MATSUO TSUTOMU, OKABE TADASHI
• Format: Patent
• Language: English; Japanese
• Published: 12.10.2017
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

PROBLEM TO BE SOLVED: To provide a lock bolt which may be applied to both of collapse of bank due to looseness after boring around underground space and deformation in the bank toward the underground space due to action of long term stress.SOLUTION: A lock bolt of one aspect of the present invention is a lock bolt which may be fixed onto a hole formed on a wall in an underground space with fixing material, which comprises a lock bolt main body extending from proximal side to distal side of the hole and a sheath pipe which is a sheath pipe comprising projections on peripheral wall, is shorter than the lock bolt main body, has an internal diameter larger than outer diameter of the lock bolt main body, and covers one area at proximal side of the lock bolt main body. On one end part at the distal side of the sheath pipe, a seal part is arranged for sealing a gap between the sheath pipe and the lock bolt main body.SELECTED DRAWING: Figure 1 【課題】地下空間周囲の掘削緩みに起因する地山の崩落及び長期的な応力の作用に起因する地下空間に向けた地山の押し出し変形の両方に対応することのできるロックボルトを提供する。【解決手段】本発明の一側面に係るロックボルトは、地下空間の壁に形成される削孔に定着材により定着可能なロックボルトであって、前記削孔の手元側から奥側に延びるロックボルト本体と、外周壁に突起を備えるシース管であって、前記ロックボルト本体より短く、前記ロックボルト本体の外径よりも大きな内径を有し、前記ロックボルト本体の前記手元側の一領域を覆うシース管と、を備え、前記シース管の前記奥側の一端部には、前記シース管と前記ロックボルト本体との間を塞ぐシール部が設けられている。【選択図】図１