| 摘要 |
The mine roof support system includes a plurality of truss members each having opposite end portions and are operable to be moved into and out of abutting relation with a mine roof by a plurality of prop members. Each prop member includes an upper end portion connected to a respective end of each truss so that a pair of prop members is associated with each truss member. Each prop member includes an extensible portion and a shoe which is adapted to support the prop member for slidable movement on the mine floor. Guide mechanisms connect the extensible portion and shoe of each prop member to prevent relative movement between the upper end of the prop member and the shoe. The truss members are stabilized by a stabilizer device, such as a stabilizer bar secured to and extending downwardly from the end of each truss member and connected to the extensible portion of each prop member. The stabilizer bar is yieldable so that the bending forces applied to the prop member by the truss member are relieved by bending of the stabilizer bar. The pair of prop members associated with each truss member are movable in a direction either toward or away from the mine face relative to the other pairs of prop members by telescoping devices that interconnect the tandemly positioned prop members adjacent the mine ribs. The telescoping devices are connected to adjacent prop members in a manner to relieve the bending stresses that telescoping devices are subjected to as the pairs of prop members are moved relative to an adjacent pair of prop members.
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