The bolt has three sections:
The yielding section comprises a smooth ductile steel tube, which easily debonds from the grout and absorbs energy during a dynamic event.
Maximising the length of the yielding section maximises the dynamic capacity of the bolt.
The bond section at the near end is optional and can be as short as 200 mm, providing sufficient space for the plate and the nut.
The bolt can be installed in self drilling mode using a sacrificial drill bit (one step method) with the drill bit welded to the bolt, which minimises the annulus around the bolt, providing optimal bonding and reducing grout consumption. A range of cross and button drill bits is available.
The bolt can also be installed in pre-drilled holes.
The grouting agent (CarboThix resin or cementitious grout) is injected through the central hollow section of the bolt into the borehole and fills the annulus between the bolt and the borehole wall.