Self drilling bolts are hollow rods with coarse thread on the surface that is a design similar to the drill rod. The bolt is hollow inside, allows passage of water, flushing air or injection grout during drilling. A bolt carries at its end a bit or a cutting tool with several holes sweeping, which is lost in the perforation process. Thanks to the threads on the surface the length of the bolt can be connected using coupling or connectors. The design of the self drilling bolts considered a cold rolling to form a standard thread profile. As accessory, a plate and nut will also be used. In mining, tunneling and specializing civil engineering self drilling bolts are commonly used as rock anchor. They are typically employed in extremely poor rock and soil susceptible to collapse as an alternative casing drilling.
Sinorock has been providing a wide range of quality products, service and support to the construction and mining industry for many years. We are committed to delivering ongoing solutions. Sinorock has been a leading supplier in the design and manufacture of high quality self drilling bolts since it was founded. Sinorock works together with you to ensure you always get the exact part needed to get the project done efficiently and cost effectively.
http://www.rockbolt.org/rock-bolt/t127-self-drilling-rock-bolt/
http://www.rockbolt.org/rock-bolt/t30-rock-anchor/