When it comes to the application of Sinorock hollow bar system in bridge construction, it is usually play the role of micro-piles. Suitable for narrow working facilities, Sinorock hollow bar system can guarantee the normal operation and safety within the pit. Sinorock hollow bar system is small construction equipment, which can effectively prevent the deformation of foundation pit and the movement of the pit soil outside.

Sinorock Self Drilling hollow bar provides an effective permanent anchor that can be readily installed into loose or collapsing ground without the need for a casing. Rotary percussive drilling, combined with simultaneous grouting, ensures that the grout penetrates the surrounding ground to provide an increased level of bond. 

All Sinorock Self Drilling hollow bars should incorporate a fixed length (bonded in the stable zone) and a free length (debonded with a sleeve, in the wedge zone) to enable the anchor to be prestressed. The prestress provides an active restraint, enabling the anchor to resist service loadings without additional elongation. 

Sinorock Self Drilling hollow bar Systems (irrespective of threadform) are very suitable as permanent anchors. The ground anchor length is flexible, it can be lengthened. It adapts to several projects, such as railway, tunnel, hydro-junction, slope, dam, bridge base, high-rise building, construction reinforcement and so on.