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What are the advantages of tunnel bolt

• Posted by kitemunitycom kitemunitycom Mar 25 - Filed in Shopping - 40 views

  When tunnel bolt is in operation, the bending deformation performance of raw materials is mainly used, the production and processing is relatively simple, and the engineering cost is usually low. However, because the holes are drilled for the anchor bolts to be tightened, the stress is very easy to occur at this position, and the surface bend distance is just the cross section weakening. In the initial development of the curved shrapnel fastener in our country, it was found that the bolt tightening was very easy to break in the application, and the vibration caused by the train was easy to loosen the shrapnel, and some nuts were withdrawn from the bolt. In addition, the baffle of the rail is easy to climb the bottom of the rail under the effect of vibration, resulting in the expansion of the rail.

  At present, tunnel bolt is no longer used on other rail routes except for the fastener DDT I and DDT II on subway routes. The bending deformation performance of raw materials and the distortion deformation performance of raw materials (especially the annular cross section elastic bar) are used in the work of the elastic bar, so the ductility is generally good, and most of the other materials have no cross section weakening, so the utilization rate of raw materials is high. On the basic route, it is generally expected that the buckle pressure is large and the ductility is good. tunnel bolt has significant advantages in these aspects.

  Nowadays, the key mode of tunnel bolt in China is the bolt-mounted ω-structure spring bar, such as the applied type I, type II spring bar, Shilong bridge small friction resistance spring bar, J-2 spring bar, etc. In addition, there are other structural forms of the spring bar, double toe spring bar, the middle spring bar.

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