High strength bolting as a proactive support technology, the proportion is growing in our country and even the world-wide roadway support. Its simple and efficient construction, simple construction, good support, labor intensity lighter, better adaptability, has been widely recognized. And With bolting appliances, underground mining practice so that it has been more widely used.

Broken surrounding rock tunnel construction, it should be to minimize the destruction of many of the coal and rock. The excavation process is mechanized operations is appropriate. The construction of the bolt holes should be used rotary cutting process as much as possible to avoid the shock and vibration of coal and rock. In the development of rock bolting in crushing the coal and rock in vivo measures or modify design, in addition to the inter-row spacing according to the specific conditions of narrow anchor or anchor rope, you can consider using the following techniques.

The full length of the high strength of high strength bolting technology: high intensity total length of anchor bolt the anchoring force distribution in the length of the rod, to avoid the end of the anchor bolt anchoring force is concentrated in the surrounding country rock. Supporting effect of the full length of the high-strength bolt, the same rod diameter ordinary end of the anchor bolt several times or even ten times. The total length of anchor bolt hole basically no gap, rod, anchoring agent in the surrounding rock combined into one, greatly improving the carrying capacity of the anchor body. The total length of anchor bolt with high strength, can provide greater initial bolting and anchoring force, give full play to the anchor of the coal and rock binding role and shear-role, and improve the integrity and carrying capacity of the surrounding rock.

Widened, thickened W strip as a combination of components: the anchor net portfolio supporting forms conducive to anchoring balance arch role can anchor, net, beam (with) the support member to form a support overall, improve the integrity of the surrounding rock to prevent bolt loosening of the rock surrounding the role of high-strength bolting, and through the role of the beam support system has a high level of security, and to prevent the sudden roof fall accident. Reinforced ladder beam is a line contact: W steel strip belongs to surface contact, and high strength, rigidity, large area overhead guard. In crushing coal-rock roadway, you should use a generous-W steel strip instead reinforced ladder beams, to make full use of the advantages of the W strip to ensure the strength of the surface support, support would be better.