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一、问题的引出 为适应中厚煤层开天窗支架回采的需要,采面的机、风巷需留顶煤,沿底掘进;石门揭煤时,也有一段半煤岩巷,需要留顶煤;另外煤层中的开掘工程,有时因各种需要,也必须留顶煤掘进。由于煤的强度低,加之和顶板岩石粘结力较差,很易脱落。不但影响正常生产,而且成为隐患,因而必须采取行之有效、切合实际的临时支护措施,以防止顶煤脱落,保障安全生产。
First, the problem leads to meet the needs of the middle and thick seam open skylight support mining, face machine, airway need to stay top coal, along the bottom of tunneling; stone door uncovering coal, there is also a semi-coal rock roadway, need to stay top coal; other The digging in the coal seam, sometimes due to various needs, must also lead the top coal heading. Due to the low strength of coal, combined with the poor roof rock adhesion, it is easy to fall off. Not only affect the normal production, but also become a hidden danger, it must take effective and practical temporary support measures to prevent the top coal off to ensure safe production.