Đang tải... (xem toàn văn)
~ 1 honq TI '''' k hoa !1/'''')( c6ng nghe m3'''' ~ rrinli toan caethong so'''' vi NEODlfUNG LlfC CHONG LO THEONGUY~NLf DAMfJANHltULOP NGUY~N VAN PHLIONG V;~n Khoa hl)c C6ng ngh~ Mo TKV At present, in underground[.]
~ ~ honq TI '_k_hoa !1/')( c6ng nghe _m3' _ - _ rrinli toan caethong so' vi NEO DlfUNG LlfC CHONG LO THEONGUY~NLf DAMfJANHltU LOP At present, in underground coal mines on the world, support works at coal headings have been carried out with the application of anchor bolts on the principles of roof rock beams The paper introduces some calculation results of the proper parameters of anchor bolts in the case of making multi-layers roof rock beams D~t van de NGUY~N VAN PHLIONG V;~n Khoa hl)c C6ng ngh~ Mo -TKV ~'~I~~Q~fi\lIk~~~lf\'I~;~?'f ~JP~~\'IIJh~~~ Hi~nnay, cac mo than ham 16trem the gidi cong vi~c c'hong gilt cac dLlang 16 than bam vach SLrdl,log ket cau neo dtJ ling IIfc tfnh toan theo nguyen Iy blm dam dang dLl