China Manufacturer Coal mine hollow rock grouting anchor bolt roof bolt

China Manufacturer Coal mine hollow rock grouting anchor bolt roof bolt

Advantage:

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

Feature:

(1) In the longitudinal direcition , rock body has equal tensile strength ,that is about 40% higher than the reverse-twist bolt in the same specification .

(2) Extend the support area , not only be used by end anchoring ,but also be used by fully anchoring ,that has a better support efficiency .

(3)Low price, widely used in coal mines, railways, hydropower and other types of roadway projects.