Main types of fencings used in mine
Two main types of fencings used below ground are U-1 and U-2. U-1 Wire ropes(or rope strand,barbed wires or rollas)nailed to vertical props set flush on sides of the gallery.Gap of bottom most member from floor 0.25m, between other members 0.3m,top not less than one meter from ground.U-2 fence is used at :Goaf edges, areas of roof fall ,place of misfire ,place of accumulation of gas,Site of accident. It consists of two wire ropes(or rope strands,barbed wires or wooden rooles)fixed with cement in sides of pillars across the gallery at a height of about 0.6m and 1.0m respectively. U-2 is used at entries to disused galleries.
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