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公开(公告)号：US4277204A
公开(公告)日：1981-07-07
申请号：US74998
申请日：1979-09-13
摘要： A method and a system are disclosed for supporting an overburden. A single-section or telescoped multi-section longitudinally slit prop casing of light sheet material such as cardboard or metal has a fabric bag installed in it. When the casing is erected the bag is filled with a slurry of hardenable substance which, upon hardening, forms in the bag a column which supports the overburden. The casing may be left in place or it may be removed for re-use.
摘要翻译： 公开了用于支撑覆盖层的方法和系统。 轻质片材（如纸板或金属）的单段或多层纵向狭缝支撑套筒内装有一个织物袋。 当套管竖立时，袋子中填充有可硬化物质的浆料，硬化后，在袋子中形成支撑上覆层的柱。 外壳可以放置在适当位置，或者可以将其移除以重新使用。
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公开(公告)号：US4378132A
公开(公告)日：1983-03-29
申请号：US235144
申请日：1981-02-17
申请人： Klaus Spies , Harry J. Fitzgerald
发明人： Klaus Spies , Harry J. Fitzgerald
摘要： A method of single-entry mining of coal and analogous minerals is disclosed, which permits substantially 100% extraction of the coal or other mineral in a seam. All operations are carried out under hydraulic steel roof supports adjacent the mine face; farther back the roof is supported by non-yielding cast-in-situ pillars of quick-setting concrete rather than coal pillars or other supports. Mining machinery for these purposes is also disclosed.
摘要翻译： 公开了一种煤和类似矿物的单次采矿方法，其允许在接缝中基本上100％提取煤或其他矿物。 所有操作都在靠近矿井的液压钢屋顶支架下进行; 更远的屋顶由快速凝固混凝土而不是煤柱或其他支撑物的非屈服铸造支柱支撑。 也披露了用于这些目的的采矿机械。
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