| 摘要 |
This mine prop comprises an elongate post 10 made of timber, a cylindrical sleeve 14 made of reinforcing material which extends over part of the length of the post from its first end or from a point near this first end and bearing means 22 which are arranged at the end provided with a prop sleeve and which comprise an external load-supporting surface which is much smaller than the surface of the cross-section of the sleeve 14. <IMAGE>
|
