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П型钢梁在破碎顶板中的应用《中州煤炭》１９９４年第１期刊登杨张杰同志的文章，详细介绍了П型钢梁在一些破碎顶板高档普采工作面中的推广应用情况。文章说：破碎顶板高档普采工作面端面顶板支护问题，长期以来一直没有得到很好解决，其主要原因是由于破碎顶板允许裸露...
П steel beams in the crushing of the roof application “Zhongzhou Coal” No. 1, 1994 published articles by Comrade Yang Zhangjie, detailing the application of some steel beams in the smash roof high-grade general mining face. The article said: Broken roof high-grade universal mining face roof support problems, has long been a good solution has not been, the main reason is due to the broken roof allowed nudity ...