The application range of anchor bolt is extending. In track and slope of railway, self drilling anchor bolt plays a tight supporting role and ensures security.
Self drilling anchor bolt is a kind of hollow anchor bolt, thread is over its surface, coupling can lengthen anchor bolt and disposable drill bit is installed at its front.
Because of special structure, self drilling anchor bolt has several advantages:
? High efficiency during construction: self drilling anchor bolt combines drilling, grouting and anchoring together, which decreases the
working procedure and improves working efficiency.
? Extensive application: self drilling anchor bolt is suitable for stratum which is difficult to drill holes, such as weak and broken
surrounding rocks, it is difficult to insert anchor bolt or cable and easy to collapse. After drilling, anchor bar stays in hole and don’
t need to be pulled out, which saves time, decreases difficulties and avoids collapse.
? Strong adaptability: thread is over the surface of anchor bolt, it can be cut at any position according to different construction conditions.
? High anchorage force: the thread of self drilling anchor bolt includes R-type and T-type, which combines with grouting materials and then has good adhesiveness, high anchorage force.
? Good anchoring effect: seriflux is grouted from down to up, which is sufficient and dense, so the quality of anchoring is quite good.
? Simple and convenient construction: compared with common anchor bolts, self drilling anchor bolt has decreased the procedures of installing anchor bar, inserting injection pipe, which is simple and convenient for workers to operate.
Ductile grouting is an advanced method for supporting construction projects, it has overcome several challenges, so self drilling anchor bolt can apply to this kind of projects.