Friction rock anchors are simply a long length of open seam, high strength steel tube. One end is equipped with a welded steel ring which retains a bearing plate. The opposite end is tapered to facilitate easy insertion into the drilled hole in the rock. The friction rock anchor is driven into a drilled hole slightly longer and slightly smaller in diameter than the unit. The slot along the length of the tube is compressed as it is driven into the drill hole. The outward radial force generated by the compressed tube on the surrounding rock, anchors it in the hole.

 

APPLICATIONS

As a temporary, quick and easy support in development ends prior to the installation of more permanent support (should this be needed)

Securing of wire mesh in underground excavations, road cuttings and open pit highwalls

As an anchor to hang pipes and cables.

 

RECM HOLE SIZES

Hole sizes should be 1 to 4mm smaller in diameter than the FRA to be installed, this is important for good performance.

FRA diameter                                       

33mm  |  39mm  |  42mm  |  46mm

Recommended hole diameter (mm)

30 – 32  |  35-38  |  38-41  |  41 – 45    

 

SIZES

All four diameters are available in standard lengths from 0.6m to 3.0m in increments of 0.3m

Non-standard lengths are available on application.

 

DOMED BEARING PLATES (WITH OPTIONAL DOG EAR)

Length mm  |  Width mm  |  Thickness mm  |  Hole size mm*

125  |  125  |  5 or 6  |  34, 40,43 or 47

150  |  150  |  5 or 6  |  34, 40,43 or 47

* Determined by FRA diameter

 

INSTALLATION PROCESS

These units are easy to install and all that is required is the appropriate driving tool and a percussion type drill (jackhammer, jackdrill, stopper etc).

Drill a hole 1 to 4mm smaller in diameter than the FRA to be installed

Place the driving tool into the chuck of the drill

Place the bearing plate over the tapered end of the FRA

Place the tapered end of the FRA into the collar of the drill hole and align

Start the drill and drive the FRA home until the bearing plate is hard up against the rock face.

 

DRIVING TOOLS

Tools are available for all three sizes of FRA.

INTERESTED?