Mechanical Anchors

The expansion shell on this mechanically anchored friction bolt provides active end anchorage and the expandable ‘C’-section ensures the integrity of the prestressing should scaling take place around the collar of the hole.

Gemini Bar^® is the elegant solution for full column grouted mechanical anchor bolts. It is a cold rolled, fully threaded bar made up of twin halves, resulting in a breather hole down its middle. An expansion shell is fitted to one end and at the other end a free running nut, seat, load indicator and bearing plate are attached. A short grouting tube with a gasket completes the assembly.

Based on a continuously threaded bar, the TB 950 is exceptionally versatile and well-proven worldwide. The TB 950 may be cut to finished lengths at the factory or on site and anchorages, nuts or couplers fitted immediately without frustration or delay. Being coarse and robust, the thread is ideally suited for use in the construction industry.

Manufactured from high strength input steel, the Dyno Bar is cold thread rolled into a continuously threaded bar over its entire length. The Dyno Bar system is ideally suited to the construction industry where greater forces are encountered.

The unique 3-leaf expansion unit has exclusive features that ensure positive anchorage under the most arduous conditions. The expansion unit, which is available as a 'bail type' unit, is a 3-leafed mechanical anchor which conforms to the hole diameter. This feature ensures a more even load distribution between the anchor and the rock at the anchor point.

The cold form thread pattern on the Unibar™ gives closer tolerance between thread and nut (no 'rattle fit') and greater tensile strength. These features combined, provide improved load retention capability, compared to conventional hot-rolled fully threaded bar.

Mechanically anchored (also known as end anchored) rock bolts or rock studs, are extensively used in the support of underground excavations. This type of support is recommended for the short to medium term where no subsequent support of a more permanent nature is envisaged i.e. shotcrete and or wire meshing and lacing.

No reduction in load capabilities as threads exceed the nominal bar diameter. Robust thread design accepts harsh conditions without affecting threadability. Increased bond strength achieved owing to large surface area of ribs. Continuous thread enables retensioning in the event of ‘scaling’, as well as cutting of the bar at any point.

Surelock^® mechanical anchors are flexible high-tensile steel strands of specific lengths, anchored inside a drilled hole with an innovative locking-off unit called the ‘Surelock^® swivel barrel’ at the collar. The advantage of using this locking-off device is that once the required prestressed load is achieved, the shear ring shears on the barrel into a positive visual indicator with an audible knock.