Self drilling hollow anchor bar is unique in hollow bar system,with the properties of safer and faster,this kind hollow bar is very different from others in the R-thread and T-thread types.In the procession of anchoring,this hollow bar is more suitable for tunneling industry and geological engineering.In order to make full use of the advantages of many applications,the time of anchoring will be enormously saved.
R-thread and T-thread hollow bar anchors all belongs to large-pitch thread. Compared with traditional Metric screw thread, they have lower adhesive strength with coupling and cement layer, while, they largely accelerate the speed of installing accessories. During the process of move and transportation, large-pitch thread can avoid being damaged and keep intact.Because of good construct design, R-thread hollow threaded bar can decrease the variation of stress, avoid concentration of stress and prevent the fracture during drilling process.
T-thread hollow bar anchors gets its name from the trapezoid or quadrangled section, which ensures the optimal bonding stress between anchor bar, coupling and grouting medium. The bonding stress of T-thread is 2.4 times of R-thread. While because of the big change of cross section, stress concentration will be caused easily and fracture tendency will be occurred in the conditions of drilling process and repeated fluctuating load.For projects facing geo-conditions above,hollow threaded bar should be considered as the main solution cuz it’s designed for optimized installation, tailored to the project’s needs.
And for a long time,Sinorock is an adherent of professional product and excellent service on hollow bar anchor system field.Our quality products, prompt delivery, and competitive pricing give our customers the advantage,also the foundation stone for opening the market.The company dedicate its innovation of service and product to gain us much praise from the customers.So the Sinorock is the best choice for most of the construction.