摘要
本文介绍了一种新型π型钢顶梁的特性,它与HDJA顶梁相比具有许多优点,推广使用π型钢顶梁具有很高的经济效益。
The advantages and shortcomingsof the HDJA metal linked roof which is widely uti-lized in our country is analyzed, and the new π-profile roof bar is introduced in this paper. Com-pared with the former, the π-profile roof bar hasthe advantage of the structure, strength, stability,workability, etc.. Therefore, it would obtain eco-nomic benefits to popularize the new roof bar.
出处
《矿山压力与顶板管理》
1990年第3期25-28,72-73,共4页
Ground Pressure and Strata Control
