Drilling Tie Backs

Drilling Tie Backs

The Self-Drilling Hollow Bar Anchor System is
comprised of a hollow threaded bar with an attached
drill bit that performs drilling, anchoring and grouting in
a single operation. The hollow bar allows air and water
to freely pass through the bar during drilling to remove
debris and then allow grout to be injected immediately
after drilling is completed. Grout fills the hollow bar
and completely covers the entire bolt. Couplers can
be used to join hollow bars and extend the bolt length
while nuts and plates are used to provide the required
tension. The Self-Drilling Hollow Bars are known for
their excellent load capacity and are available in
Normal (N) and Special (S) types with diameters from
1 to 4 in. (25 to 103 mm).

Self-Drilling Hollow Bar Anchor System Features

Drilling, anchor installation and grouting in single operation

Separate anchor installation or removal of casing and drill rods is not required

Similar installation methods for all ground conditions

Choice of drill bits for different ground conditions

Hollow core is used for flushing with air or water during drilling along with grouting the anchor tendon

Flexibility in length by using coupler

Ability to work with small drill rigs without casing in restricted headroom conditions

Enhanced corrosion protection available upon request.