Rockbolts made of steel pipes

Details Rockbolts made of steel pipes Rockbolts made of steel pipes

2011-04-19

2011-04-19

Singh, Sunil (Department: 3672)

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

Reexamination Certificate

active

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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