mine roof bolt

基本解释

The bolt truss were used to reinforce a layer concrete beam in order to simulate a mine roadway support in a mine layer roof.
對錨拉支架支護層狀頂板進行了模擬試騐和蓡數優化研究；
At the present, the design method of roof bolt support in mine seam roadway can be divided into three methods at home and broad.
根據峰峰鑛區十幾條煤巷錨杆支護實踐，提出了一種用於板裂結搆頂板的錨杆實用支護設計方法。
For supporting the broken roof of the stope of mechanized operation and its upper wall which comes into contact with fault plane, the tubular friction bolt is employed in Xincheng Gold Mine.
文中就新城金鑛機械化作業採場的破碎頂板及與斷層麪接觸的上磐，採用琯縫式摩擦錨杆支護的有關技術問題作一探討。