... roof bolt hole 顶板锚杆钻孔 roof bolt plate 锚杆垫板 roof bolting 顶板锚杆支护 ...
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In the second step, the prestressed cable is used as reinforced support to the roof plate, and the reinforcement by bolting and grouting with inside grouting bolt is applied to base Angle.
然后再采用预应力锚索对顶板进行加强支护，且对巷道底角采用内注浆锚杆进行锚注加固。
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