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Shotcreting Support of Cuncao Tower in No.2 Coal Mine
Author(s): 
Pages: 13-14,48
Year: Issue:  10
Journal: Coal

Keyword:  roadwayspray anchoranchorshotcretingspray thickness;
Abstract: According to 22112 Face Roadway of No .2 Coal Mine in Cuncao Tower ,according to the theory of the suspension bolt and shotcreting,it determined that it adopt the D18 mm ×2 000 mm round steel bolt +70 mm thick shotcrete for supporting .Anchor row spacing is 1.1 m,it considered roof safety factor of 1.3 times and each row of five roof bolt;it consisted of sprayed concrete mass ratio of cement∶sand∶gravel=1∶2∶2,sprayed layer thickness is 70 mm,two times for spray protection ,first spray a layer thickness is 15 mm,a second spray protective layer reaches a final thickness of the spray .Field application shows that the shotcrete support scheme has a better supporting effect .
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