Hollow grouting self-drilling anchor bolt is a bolting solution for unstable ground conditions such as sand, gravel, silt and clays, and for soft to medium fractured rock formations.

A hollow grouting self-drilling anchor bolt system consists of: a hex nut, a bearing plate, a coupling sleeve which enables the flexibility in length, hollow anchor bar(s) and a sacrificial drill bit.

Application:Mining, Tunneling, Slope Stabilization, Foundation Pit and Roof  Supporting of  underground works

Prime advantage of the self-drilling anchor
1, easy and similar operation principle for different rock mass and soil conditions
2, drilling, anchoring and grouting can be performed in one single operation
3, no pre-drilling of a borehole by using a casing tube and extension rods with subsequent anchor installation necessary
4, minor space requirement for the accomplishment of anchoring
5, optimized machinery and manpower requirements
6, basic dimensioning of the required anchoring forces by choosing the appropriate anchor type
7, optimum bonding of the profiled anchor rod and the grout
8, adjustment of the drill bit design and diameter to different rock mass and ground conditions
9, simple anti-corrosion method available
10, appropriate for temporary or permanent applications