Theory and Practice of Controlling Roof Safely by Grid Bolt Set in Complicated Seam

摘要

In this paper, the composite reinforcing mechanism of bolt and rock is discussed, a grid shape or ortho-net shape layout of bolt set to reinforce roof in gates, connections and cuts is put forward. The purpose of roof falling lag behind has realized and also no worker is necessary in work face, therefore the unsafe cases arose by roof fall in work face are avoided. It is granted as a patent on n invention by China National Patent Bureau and is valuable for applications in the similar condition mines.