| 摘要 |
<p>A mine roof support (10) comprises a plurality of chocks (12) connected together through notches (14) in the chocks to form a triangular structure having three external sides (16). Preferably, the chocks on each side interlock with substantially 100 % surface contact between the horizontal surfaces of adjoining layers. A method for forming a mine roof support crib comprises the steps of linking a desired number of chocks (12) onto each other or the first, second, or third chocks through the notches (14) of the respective chocks until a triangular structure having three external sides is formed to provide support of a mine roof.</p> |
