Rockbolts made of steel pipes

Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor

Reexamination Certificate

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Reexamination Certificate

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07927043

ABSTRACT:
A sleeve10for introduction of a pressurized fluid, which is attached to a rockbolt main body1, comprises a cylindrical projecting part11of a large diameter and a bearing-plate-holding part12of a diameter smaller than an aperture of a bearing plate6. The projecting part11and the bearing-plate-holding part12preferably has the same inner diameter. When the rockbolt main body1is embedded in a bedrock or ground, the bearing plate6locates on an edge of a rockbolt-setting hole of the bedrock or ground, and the bearing-plate-holding part12extends through the bearing plate6into the rockbolt-setting hole. Since the projecting part11and the bearing plate6are disposed on a sprayed concrete layer, a projection height of the rockbolt is remarkably decreased. Consequently, lining concrete8is applied onto the sprayed concrete layer with ease, and the bedrock or ground is reinforced with high reliability.

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patent: 2004-019181 (2004-01-01), None
patent: 2004019181 (2004-01-01), None
patent: 2005-076310 (2005-03-01), None
patent: 2005076310 (2005-03-01), None
patent: PCT/JP2004/011200 (2004-11-01), None

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