| 摘要 |
Tie for frame supports of mine workings arranged as a rectangle in layout, with length that is equal to pitch of installation of frame support, with calculated values of its width and thickness, made of concrete or slag concrete. The ends of the tie at both ends, in 100 mm, are made straight, and the middle section of the article, at front view, is arranged as an arc that has thickness same to that of the straight ends of the tie, and the inner diameter of the arc is equal to 1.662 A, where A – pitch of installation of the frame support. |
