Friction Rock Bolt with Load Absorber for Seismic Anchorage

The patent incorporates a load absorber component that deforms under impact loads to dissipate ground kinetic energy before it reaches the anchorage system. This beforehand cushioning mechanism prevents excessive forces from dislodging the rock bolt during seismic events, thereby maintaining reliability while keeping the insertion process simple and tool-free.

The patent replaces the chemical anchoring systems (resin or cement cartridges requiring mixing and pumping equipment) with a purely mechanical friction-based anchorage system. The rock bolt achieves reliable anchoring through friction between the tube surface and bore wall, eliminating the need for complex chemical anchoring equipment while maintaining sufficient bond strength for the application.

The patent replaces the cumbersome chemical anchoring process (requiring mixing, pumping, and delivery equipment) with a simple mechanical friction anchorage system. The rock bolt is inserted directly into the borehole and achieves anchoring through friction between the tube surface and bore wall, eliminating the need for complex equipment and improving ease of operation while maintaining reliable bond strength.

The patent employs an asymmetrical tube design with a smooth surface portion and a ribbed surface portion at different locations along the tube. This asymmetrical configuration creates varying friction characteristics along the tube length, improving anchorage reliability through differential friction engagement while avoiding the complexity of mechanical expansion mechanisms.