LOCK BOLT MADE OF STEEL PIPE

• Main Authors: KITTAKA, Toshiharu, IWASAKI, Tatsurou, TANASE, Hiroyuki, NAKATA, Masahiro, ITOU, Tetsuo, OOSHIMA, Kenji, NAKAKO, Takefumi, YOSHIDA, Takeyuki, SHIROMA, Hiromichi
• Format: Patent
• Language: English; French; German
• Published: 06.09.2017
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LARGE UNDERGROUND CHAMBERS; METALLURGY; MINING; SHAFTS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TUNNELS

A sleeve 10 for introduction of a pressurized fluid, which is attached to a rockbolt main body 1, comprises a cylindrical projecting part 11 of a large diameter and a bearing-plate-holding part 12 of a diameter smaller than an aperture of a bearing plate 6. The projecting part 11 and the bearing-plate-holding part 12 preferably has the same inner diameter. When the rockbolt main body 1 is embedded in a bedrock or ground, the bearing plate 6 locates on an edge of a rockbolt-setting hole of the bedrock or ground, and the bearing-plate-holding part 12 extends through the bearing plate 6 into the rockbolt-setting hole. Since the projecting part 11 and the bearing plate 6 are disposed on a sprayed concrete layer, a projection height of the rockbolt is remarkably decreased. Consequently, lining concrete 8 is applied onto the sprayed concrete layer with ease, and the bedrock or ground is reinforced with high reliability.