Ongoing development of faster, safer and more exotic tunnelling techniques places a constant pressure on manufacturers to provide more efficient rock support solutions which will help the shortening of cycle time. As ground conditions get more and more demanding, emphasis is placed on flexible and intelligent support systems in which rock and soil reinforcement is expected to contribute to the productivity and safety of the operation. The trend has been to provide rock support and reinforcement systems that are easy to install, assure efficiency and provide safety. Since self drilling anchor bar is mainly used in the fault fracture zone advanced support construction, under the complex geological conditions instead of ordinary catheter, overcoming the problems such as hole collapse, unable to plug rod, grouting is not full,ect. which played a supporting role in advance, ensuring the overall stability of the surrounding rock, and the safety of construction personnel and tunnel, with good application value. Sinorock hollow bar anchor products are all manufactured according to strict ISO rules. There are two important quality parameters for a Sinorock self-drilling anchor system .Firstly, that rods can withstand the stipulated breaking load and, secondly,that couplings and bits can be easily threaded. Ultimate load tests are carried out on all load bearing components in accordance with the strict quality process regulations. Should a system fall short of the given tolerances, production is stopped and the fault is rectified. http://hollowbars.nice-hp.com/Sinorock
