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Friction stabilisers provide instant ground support and offer the advantage of a single pass installation.
A Division of Fero Group
1.1 Friction Stabilisers
4 www.fero.com.auAll specifications are applicable at the time of publication and may be amended from time to time.
Friction stabilisers are made from high tensile steel that is roll-formed into a tubular section containing a continuous longitudinal opening along the length of the tube. A steel ring is fixed to the collar end of the tube and when the stabiliser is installed onto the stabiliser plate it establishes a compressive force against the rock. The ring-in combination with a pull collar also enables load testing once the bolt has been installed. The tapered end of the friction stabiliser enables easy insertion into the drilled hole. Friction stabilisers can also be manufactured with no taper for installation direct into paste.
The compression of the tubular shape of the bolt into a slightly smaller diameter hole generates a load transfer from the steel to the rock. The tubular shape of the bolt enables increased contact of the steel against the rock generating radial pressure and creating frictional resistance to the pull-out load of the tube from the hole.
When additional load bearing capacity is required, friction stabilisers can be grouted.
Once installed load pull-out capacity can be tested as required by attaching a pull collar to the steel ring fixed to the collar end of the friction stabiliser and measuring with a pull testing unit. Friction stabiliser bolts can be installed with either hand held or mechanised equipment such as Jumbos.
Fero friction stabilisers are manufactured to exceed Australia’s high quality standards and are quality tested in-house and in-situ. Contact the Fero Strata technical services team for technical and product advice, operator training and in-situ-testing.
Contact the Fero Strata team for more information at sales.strata@fero.com.au
1.1 Features
Provide instant ground support
Single pass installation
Made from high tensile steel
Able to be tested in situ
Available in hot dip galvanised or untreated steel
Available in a range of sizes
1.0 Friction Stabilisers Friction stabilisers have been used by the metaliferous mining and tunneling industry for decades and are considered the simplest and most cost effective form of ground support
Ring end
Taper end
A range of accessories available
5www.fero.com.auAll specifications are applicable at the time of publication and may be amended from time to time.
1.2 Friction Stabiliser Range
Fero Strata friction stabilisers are manufactured in 33, 39 and 47mm diameters and various lengths. Lengths typically range from 600mm to 3000mm in 300mm increments. Other lengths and customised product to suit specific requirements are available on request. Fero friction stabilisers are available in galvanised or untreated steel in packs of 150 or 300 for 33mm stabilisers.
33mm Stabiliser The 33mm friction stabiliser is primarily used to establish ground support when hand-held mining operations (Air Leg mining) are required.
39mm Stabiliser A 39mm stabiliser is primarily used for securing strata mesh by installing into existing 47mm Friction Stabiliser in conjunction with a smaller plate. Longer lengths are also used as primary ground support when drilling smaller diameter holes.
47mm Stabiliser The 47mm friction stabiliser is used as a primary support in mechanised jumbo development and production mining.
6 www.fero.com.auAll specifications are applicable at the time of publication and may be amended from time to time.
FS33 Minimum
FS33 Typical
FS39 Minimum
FS39 Typical
FS40 Minimum
FS40 Typical
FS45 Minimum
FS45 Typical
FS47 Minimum
FS47 Typical
Physical Properties
Stabiliser Diameter (mm) - 33 - 39 40 - 45 - 47
Steel Thickness (mm) - 2.3 - 2.3 - 3.2 - 3.2
Mass per metre (kg) - 1.53 - 1.75 - 2.4 - 2.74 - 2.74
Installation Details
Hole Diameter Range (mm) - 29-31 - 35-38 - 41-43 - 43-45
Mechanical Properties
Yield Strength (MPa) 415 510 415 510 350 460 350 450 350 450
Yield Force (Metric Tonne) 8.5 10.4 9.3 11.4 9.7 13.0 12.3 15.8 12.3 15.8
Ultimate Tensile Strength (MPa) 510 600 510 600 430 520 460 520 460 520
Ultimate Tensile Force (Metric Tonne) 10.4 12.2 11.4 13.4 11.9 15.8 16.1 18.2 16.1 18.2
Cross sectional area (mm2) - 204 - 223 - - 350 - 350
Elongation on 80mm sample (%) 16 - 16 - 20 - 20 - 20 -
Testing Standards
Material
Galvanising
Welding
2.0 Physical & Technical Properties
3.0 Associated Accessories
Fero Strata manufactures and supplies a comprehensive range of accessories for use with friction stabilisers. It is recommended that friction stabilisers be used with associated Fero Strata products.
For more detailed information contact the Fero Strata technical services team to ask for a Fero Accessories brochure.
Email: sales.strata@fero.com.au
AS1594/AS2505/AS1391/AS1365
AS4680
AS1554 Part 1 2004
7www.fero.com.auAll specifications are applicable at the time of publication and may be amended from time to time.
3.1 Stabiliser Plates
Fero manufactures a range of stabiliser and duplex plates for use with friction stabilisers, wriggle bolts and cable bolts.
Fero Strata stabiliser plates are designed in-house and quality tested to a high-load capacity to provide optimal surface support in a range of ground conditions. Fero stabiliser plates are available to suit any bolt type and diameter in the Fero range. Strata plates most typically used with friction stabilisers are:
125 or 150 Stabiliser Plate A general purpose plate, both the 125 and 150 stabiliser plates are manufactured from 4mm material to suit 33mm and 39mm friction stabilisers; and can be used with a 47mm friction stabiliser. The dome assists in stabiliser alignment and provides additional strength. The hanger lug provides support of service products.
300 Duplex Stabiliser Plate The duplex plate is a 4mm thick 125 or 150 stabiliser plate welded to a 1.9mm thick 300 x 280mm strata plate, the pressed rib sections in the 1.9mm material provide additional strength and minimise deformation upon installation. The Duplex plate gives greater surface coverage when supporting strata-mesh or when used directly on rock surface. User friendly round edges for increased safety and mesh protection.
200 or 225 Stabiliser Plate A specialised plate, the 200 and 225 stabiliser plate is also manufactured from 4mm material. The 225 stabiliser plate was developed as a cost saving alternative to the duplex plate. The 225 plate provides slightly less surface coverage than the duplex plate. However, as it is made entirely from 4mm material, it provides higher grade coverage over a larger surface area than the larger 1.9mm material area of the duplex plate.
The plate is designed to deform during the installation process to prevent damage to strata- mesh and to minimise point loading of the ring. The 200 or 225 plate is typically used with 47 mm stabiliser but can also be used with 33mm and 39mm friction stabiliser. Dual hanger lugs provide extra versatility for support of service products.
300 Strata Plate This lighter gauge 1.9mm plate is used when greater surface coverage is required in fractured ground. The plate is manufactured with four pressed rib sections on the outer perimeters of the plate to provide more strength to the lighter gauge material. The 300 strata plate can be used with any size bolt and in conjunction with smaller diameter plates
8 www.fero.com.auAll specifications are applicable at the time of publication and may be amended from time to time.
3.2 Driver Tools
Fero supplies a full range of purpose designed driver tools for use with both mechanised and hand-held bolting equipment. Fero driver tools and spiral bar are manufactured from high grade heat treated steel. Threading meets Australian Standards AS1275. Fero Driver Tools are supplied loose per unit. Other packing quantities are available on request.
Driver Tools for Fero friction stabilisers include:
33mm Stabiliser Driver Tool The 33mm stabiliser driver tool fits directly into the chuck of the hand-held unit and is available in male and female configurations to suit the 22mm hex adaptor.
39mm & 47mm Stabiliser Driver Tools Our 39 or 47mm stabiliser driver tools are attached to the rock drill by a spiral bar. This allows the stabiliser driver tool to extend outside the front centraliser for ease of installation of friction stabilisers. Available in an R38 or T38 thread.
Spiral Bar The spiral bar is manufactured with a cold rolled thread over its entire length and supplied in standard lengths of 3100mm or 3600mm. The spiral bar is cut to the desired length on the mine site and used as a joiner between the rock drill and the 39mm and 47mm stabiliser driver tool.
3.3 Drill Bit Gauge
3.4 Pull Testing Collars
The pull collar is placed on the friction stabiliser during the installation process to enable the load capacity of the bolt to be pull tested and verify the effectiveness of friction stabiliser upon completion of installation and periodically over time. Fero Strata supplies either carbon hollow bar or forged pull collars to fit 33mm, 39mm and 47mm diameter friction stabilisers. Available untreated or hot-dip galvanised in packs of 50.
The diameter of the drill hole is critical for ensuring the effectiveness of the friction stabiliser. A bit gauge is used to measure the diameter of the drill bit which drills the hole for the friction stabiliser to be inserted into. The drill hole diameter should be slightly smaller (typically 2-4mm smaller) than the friction stabiliser to be used. In soft ground it may be necessary to further reduce the bit size to increase contact between the steel and the hole thus generating greater load transfer and increasing pull-out load.
Spiral Bar39 & 47mm Stabiliser Driver Tool33mm Stabiliser Driver Tool Pull Testing Collars
9www.fero.com.auAll specifications are applicable at the time of publication and may be amended from time to time.
3.5 Pull Testing Unit
Pull testing equipment is essential to verify friction stabiliser and other rock bolt system performance. Fero supplies both hand operated and battery operated pull testing units for in-situ testing of most rock bolt systems. The unit is easily transportable. Alternatively, the Fero Strata technical service team can provide full underground pull testing services.
4.0 Product Codes, Weights & Pack Sizes
Fero Product Code
Fero Product Description
Diameter (mm)
Length (mm)
Surface Finish
Weight Each (kg)
Pack Qty
Pack Weight (kg)
Ring Colour ID
FS33-0900 Friction Stabiliser 33 x 900 33 900 Un-Treated 1.50 300 450 -
FS33-1500 Friction Stabiliser 33 x 1500 33 1500 Un-Treated 2.40 300 720 -
FS33-1800 Friction Stabiliser 33 x 1800 33 1800 Un-Treated 2.75 300 825 -
FS33-0900G Friction Stabiliser 33 x 900 - HDG 33 900 Hot Dip Galvanised 1.50 300 450 -
FS33-1500G Friction Stabiliser 33 x 1500 - HDG 33 1500 Hot Dip Galvanised 2.50 300 750 -
FS33-1800G Friction Stabiliser 33 x 1800 - HDG 33 1800 Hot Dip Galvanised 3.00 300 900 -
FS39-0600 Friction Stabiliser 39 x 600 39 600 Un-Treated 1.20 150 180 -
FS39-0900 Friction Stabiliser 39 x 900 39 900 Un-Treated 1.70 150 255 -
FS39-2400 Friction Stabiliser 39 x 2400 39 2400 Un-Treated 4.25 150 638 -
FS39-0600G Friction Stabiliser 39 x 600 - HDG 39 600 Hot Dip Galvanised 1.20 150 180 -
FS39-0900G Friction Stabiliser 39 x 900 - HDG 39 900 Hot Dip Galvanised 1.70 150 255 -
FS39-2400G Friction Stabiliser 39 x 2400 - HDG 39 2400 Hot Dip Galvanised 4.50 150 675 -
FS40-900G Friction Stabiliser 40 x 900 - HDG 40 900 Hot Dip Galvanised 2.25 150 338 -
FS40-2400G Friction Stabiliser 40 x 2400 - HDG 40 2400 Hot Dip Galvanised 6 150 900 -
FS45-2400G Friction Stabiliser 45 x 2400 - HDG 45 2400 Hot Dip Galvanised 6.95 150 1043 Blue
FS47-0900 Friction Stabiliser 47 x 900 47 900 Un-Treated 2.50 150 375 -
FS47-1800 Friction Stabiliser 47 x 1800 47 1800 Un-Treated 5.10 150 765 -
FS47-2100 Friction Stabiliser 47 x 2100 47 2100 Un-Treated 6.10 150 915 -
FS47-2400 Friction Stabiliser 47 x 2400 47 2400 Un-Treated 6.70 150 1005 -
FS47-3000 Friction Stabiliser 47 x 3000 47 3000 Un-Treated 8.60 150 1290 -
FS47-0900G Friction Stabiliser 47 x 900 - HDG 47 900 Hot Dip Galvanised 2.75 150 413 -
FS47-1800G Friction Stabiliser 47 x 1800 - HDG 47 1800 Hot Dip Galvanised 5.20 150 780 Red
FS47-2100G Friction Stabiliser 47 x 2100 - HDG 47 2100 Hot Dip Galvanised 6.20 150 930 Green
FS47-2400G Friction Stabiliser 47 x 2400 - HDG 47 2400 Hot Dip Galvanised 6.95 150 1043 -
FS47-3000G Friction Stabiliser 47 x 3000 - HDG 47 3000 Hot Dip Galvanised 8.80 150 1320 Yellow
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