Self drilling hollow anchor bolt support is a safe and economic method in the field of construction engineering. It consists of drill bit, anchor bar, centralizer, coupling, plate and nut. The technology is drilling holes in soil, putting anchor bolt into holes and then grouting cement. Based on the friction between anchor bolt and surrounding soil, thread of anchor bolt, self drilling hollow anchor bolt can support projects. So it is a simple and convenient method for engineering support.
In stratum, self drilling hollow anchor bolt links structures with surrounding soil, transferring tension, then reinforces stratum and stables projects. Compared with traditional supporting method, self drilling hollow anchor bolt has its own features:
1. Good supporting effect.
Self drilling hollow anchor bolt combines drilling, anchoring and grouting together, it meets the demand of modern rock mechanics and the control principle of surrounding rock. It belongs to positive support. After installing self drilling hollow anchor bolt, cement can be grouted at once, which forms an integral bearing structure, so it can avoid the deformation of surrounding rocks and improve the reinforcement condition.
2. Low labor intensity and high efficiency.
Compared with traditional supporting methods, self drilling hollow anchor bolt adopts fewer materials and the weight is reduced. During the construction, it can reduce the amount of transportation and labor intensity, so it helps to improve working efficiency. It is simple to be operated and workers can organize parallel operation. It also helps to realize the mechanization of supporting.
3. Obvious economic benefit.
Adopting self drilling hollow anchor bolt can reduce the input of supporting materials and reduce the supporting cost directly. It can be constructed in narrow places, ignoring the cost of repairing roadway. In a word, self drilling hollow anchor bolt can reduce cost of supporting materials, transportation, design, reinforcement. So its economic benefit is obvious.
With the research and development of self drilling hollow anchor bolt’s technology, its advantages will be more and more. It will more convenient for people and the supporting effect will be more clear.