WEIDMANN AG of Switzerland started in 1985 with the development and manufacture of a range of GRP rock bolts which where then used in tunnelling projects in Switzerland for the first time. The GRP rockbolts where installed as permanent support in numerous tunnels, constructed in the single shell method using Weidmann GRP rockbolts in combination with steel mesh and shotcrete.
In 1994 this system was also applied for the construction of the Vereina Tunnel, Switzerland, which is 19km long and the world's longest, narrow gauge tunnel.
Weidmann GRP rockbolts have also been used in many pilot-tunnels, caverns, water-adits, slope stabilizations and quarries.
Subsequently the GRP rockbolts became well-known worldwide as the Weidmann-GRP rock bolt system has been used successfully in many applications like:
- Tunnelling
- Mining
- Civil Engineering
- Form work and Concrete Reinforcement
Many years of development resulted in the unique ALL-THREAD GRP rock bolt, which thread-profile has become also standard in the FiReP® Group for the whole range of products which now includes:
- POWERTHREAD GRP Rock Bolts
- SPINMAX GRP Self Drilling Rock Bolts
- CABLEX GRP Cable Bolts.