| 摘要 |
An improved apparatus for ground support comprising a tensionable reinforcin g member including at least one nut threadably receivable by the tensionable reinforcing member. The nut body comprises a squared portion and a convex hemispherical portion. The nut includes a bore adapted for engagement with the first end threaded portion o f the tensionable reinforcing member. The nut also at least one second bore transversing the squared portion of the nut square body portion. The second bore is adapted t o accept a shearing element capable to fix the nut in a temporary first operating position on the reinforcing member. The shearing element is a rolled member made from carbon steel. The shearing element is adapted to shear at a consistent and predetermined torque shear.
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