English
中文简体Self Self-drilling rock Bolt Couplers are ideal for use in tunnels, mines, and other underground construction work, as well as repair of damaged rocks or soils. This type of bolt can also be inserted through holes drilled using a rotary drilling machine in surrounding rocks or soil before being grouted into place - providing an efficient method of construction that combines drilling, grouting, and anchoring all in one step - making tunnel construction projects easier than ever without needing casing pipes!
The bolt is comprised of a hollow steel bar threaded according to ISO 10208 for use on different drilling rigs, featuring an energy transmission rod with patented end-to-end energy transfer, increasing overall strength. Furthermore, its unique curved shape better fits surrounding rock or soil structures and increases bonding force; unlike conventional solid anchor bars which may lead to friction build-up over time and deterioration over time.
Installation requires connecting the drill bit of a self-drilling bolt to its leading end of a rod and attaching a plate and nut at its trailing end, before using special tools to drill a hole slightly smaller in diameter than that of the self-drilling bolt (tungsten carbide drill bit is typically used).
Once the holes have been prepared, bolts are installed into each one and tightened to the plate or abutment with nuts. The slurry may then be pumped into each hole to form an efficient bond with rock or soil and to fill cracks as required.
Once the slurry has been set, the bolt is ready for use and can be taken directly from its place of installation into its proper hole for drilling. However, since its unique self-drilling mechanism enables reuse multiple times if maintained well enough.
Self-drilling rock bolts absorb much of the energy caused by rock deformation, providing anchorage for support tendons once grouted into place. Their smooth sections independently provide reinforcement functions in surrounding rock; even if one section fails, its performance does not compromise other sections' capabilities.
Local anchors are separated by relatively elongateable shank segments with local anchors possessing higher deformation capacities per unit length than shank segments, thus fulfilling the demand for deformation-tolerant bolts that can help reinforce difficult formations or prevent collapse and rock bursts. Self-drilling bolts such as this one can also be used in basements, bridge bottoms, river banks, or any other narrow environments where formations may be fragile and hard to support using traditional rock bolts.
Couplings
