As for reinforcement project with little strict for deformation control, the length of anchor bolt should be 1.5m-12m.
It apples for stratum support in weak surrounding rock, fault fracture zone and sandy gravel, which is easy to happen collapse. The length should not be larger than 12m. It can control plumpness of grouting effectively and can be constructed in narrow spaces.
3. Ordinary Hollow Anchor Bolt:
It can be used for reinforcement project with little strict for deformation control, the length should be 3m-12m. It can control plumpness of grouting effectively and ensure thickness of protective layer even. It can be also constructed in narrow spaces.
4. Fiber Reinforced Plastic Bolt:
It can be used for reinforcement project with high demands of anti-corrosion and anti-static. Its length should be 1.5m-12m.