Hollow bolts are the most basic component of roadway support in contemporary coal mines. They reinforce the surrounding rock of the roadway so that the surrounding rock supports itself. Hollow anchor rods are used not only in mines, but also in engineering technology to reinforce slopes, tunnels, and dams. The hollow anchor rod is a tension member that penetrates into the ground. One end is connected with the engineering structure, and the other end is deep into the ground. The whole hollow anchor rod is divided into a free section and an anchor section. The free section refers to the transmission of the tension at the head of the bolt to the The area of ​​the anchor body, its function is to prestress the anchor rod.

　　Luoyang Xinben Machinery Equipment Co., Ltd. specializes in the production of hollow bolts, hollow grouting bolts, water-expandable bolts, hollow grouting bolts, reverse circulation hollow grouting bolts, prestressed bolts, self-advancing hollow grouting bolts A series of products such as rods, expanded shell hollow grouting anchor rods, combined hollow grouting anchor rods, and pipes.

　　What are the advantages of bolt support?

　　Hollow bolt support is to change the mechanical state of the surrounding rock itself through the bolts inside the surrounding rock to form a whole and stable rock belt around the roadway. The hollow bolt and the surrounding rock are used together to maintain the stability of the roadway. . It is an active defensive support method and a major change in mine support.

　　The anchor rod not only has good supporting effect, but also saves materials, is simple in construction, is conducive to mechanized operation, and is fast in construction. However, the anchor rod cannot seal the surrounding rock to prevent weathering of the surrounding rock; it cannot prevent the cracked rock between the anchor rods from peeling off.

　　The types of bolts that are widely used in manufacturing mainly include hollow bolts, hollow grouting bolts, water-up anchors, and pipes, among which hollow grouting bolts are the most widely used in the market.

　　Bolt support design

　　1. Determine the bolt parameters according to the principle of reinforced arch

　　2. Calculate the parameters according to the suspension theory

　　3. Arrangement of anchor rod

　　1. Arrangement of roof bolts: the hollow bolts are arranged in a plum blossom shape; the middle row of bolts is arranged on the centerline of the roof of the road, and the distance between the bolts on both sides of the road roof is 200~300mm, and the distance between the hollow bolts is generally 0.5~1.2 m; Anchor rod angle: the middle row of anchor rods form an angle of 90° with the horizontal plane, and the anchor rods on both sides form an angle of 70° with the horizontal plane. The distance between the middle row of bolts and the moraine head is not more than 1.0m, and the distance between the hollow grouting bolts on both sides of the moraine head is not more than 2.0m.

　　2. Arrangement of road bolts: the bolts are arranged in a "T" shape; the distance between the bolts is generally not more than 1.2m