Sinorock Self drilling hollow anchor bolt has historically been known as a “self-drilling anchoring” because the hollow fully-threaded bar serves as both the drill string and the grouted anchor, thus installation is performed in a single operation. The sacrificial drill bit is threaded onto the end of the bar and left in place following drilling. The drilling fluid (air, water, or grout) is introduced through the hollow bar and allows the spoils to flush from the borehole.

The Sinorock hollow anchor bar system is particularly suitable for soils that do not allow for open-hole drilling (i.e. granular soils that are collapsible in nature). In such cases, drilling with a grout fluid serves the purpose of flushing spoils from the borehole and prevents looser, surrounding material from collapsing due to the higher relative density of the grout. Sinorock self-drilling hollow anchor bar should be considered on any project requiring fast production that would otherwise need to involve a casing system in order to maintain borehole stability.

Sinorock self-drilling hollow anchor bars are ideal for micropiles, soil nails, and tie down and tie back anchors in difficult ground conditions like weathered and decomposed rock, round gravel, sand and clay soils for either permanent or temporary use.Our mission is to be the preferred supplier of geo-support solutions and products in the world.We exist to develop and provide innovative geo-support products and solutions with exceptional service and lasting quality.