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Pit prop for in situ casting has a water porous sheath with filling valve and with separate fitting valve for top of prop
Pit prop for in situ casting has a water porous sheath with filling valve and with separate fitting valve for top of prop
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机译：原位铸造的坑式支柱具有带填料阀的水多孔护套，支柱顶部带有单独的装配阀
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摘要
A pit prop system for casting in situ has a plastic fabric sheath (7) of water porous construction filled via a valve (10) and allowed to set. The sheath is hung by integral straps (12, 13) from an overhead support and shrinkage of the filler is made up via other valves (16) in the padded top end (11) of the sheath. The additional filler is introduced at a slower rate before the main charge has set, to form a one piece casting.
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