| Anchorage Zone |
Strata horizon
where expansion or grout anchor is located. |
| Angle Compensating Device |
Any device, e.g., spherical
washer, angle plate, etc. which will provide a flat surface for the bolt
head. |
| Applied Torque |
Torque applied to the bolt by the
bolting machine. |
| Deformed Bar |
Steel bars having special
deformations to provide interlocking between the steel and the grout. |
| Embossment |
Any raised surface used to
strengthen bearing plates, e.g., donut, ribs, etc. |
| Galling |
A wearing away or seizure of two
contact surfaces caused by friction. |
| Grout |
Any chemical materials used to
provide anchorage between a bolt or deformed bar and a drilled hole, e.g.,
polyester resin. |
| Grout Annulus |
The ring of grout between the bolt
and the borehole wall. |
| Pull Test |
A test to determine the anchorage
of a support by loading it with a hydraulic ram. |
| Residual Torque |
The torque required to continue
thread take-up after the torque inhibitor has been spent prior to
tensioning. |
| Severe Installation Angle |
Where the angle of the plate and
the bolt axis exceed 5-degrees. |
| Specification |
ASTM F432 Standard Specifications
For Roof And Rock Bolts And Accessories. |
| Spinners |
A condition in which the
mechanical anchor does not set causing the bolt to spin around without
tensioning. |
| Subsequent Torque |
Any torque reading taken after the
initial installation torque reading. |
| Support Nut |
A nut of a special design that is
capable of supporting the shell during installation that does not
interfere with the proper tensioning of the bolt after the shell is
anchored. |
| Thrust |
The upward or insertion force
applied to a roof bolt by the roof bolting machine. |
| Torque Inhibitor |
Any device used to prevent bolt
take-up during rotation of the bolt to allow for mixing of a grout prior
to tensioning, e.g., dome nut, shear pin coupler. |
