Threaded rock bolts shall be provided with rolled threads of min. 150 mm length of the same corrosion protection or better than the bolt itself.
螺纹岩石锚杆应具有滚压螺纹，最小防腐蚀保护长度150mm，或者比锚杆本身要好；
Threaded rock bolts shall be provided with rolled threads of min. 150 mm length of the same corrosion protection or better than the bolt itself.
螺纹岩石锚杆应具有滚压螺纹，最小防腐蚀保护长度150mm，或者比锚杆本身要好；
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