| 摘要 |
A precast roof bearing block, such as a mine roof bearing block, may have a substantially solid molded body provided with reinforcement. The body has an upper bearing surface and a generally parallel lower bearing surface. A lateral surface connects the upper and lower bearing surfaces. A hole passes through the body member extending from one bearing surface to the other and may be located at the central axis of the body. A first reinforcing member may take the form of an annular ring which is disposed close to the upper bearing surface and a second reinforcing member may take the form of an annular ring which is disposed close to the lower bearing surface. The body member may have a substantially frustoconical or dome shaped configuration. A modified embodiment facilitates angular positioning of the roof bolt.
|
