The complete system for fencing with steel.

With the Fence-Line System construct a steel fence end assemblies in 10 minutes, without welding!  They also manufacture Spring Grip Wire Strainers which have a built in tension gauge (never overstrain again) and spring loading in the jaws (so they don’t fall off the wire), plus 10 other smaller improvements.

Fence-Line Solutions has recently done testing on steel strainer posts in conjunction with Ian Williams, (farm manager for University WA Ridgefield Farm). They tested strainer posts for end assembly pull strength, and resistance to jacking in particular.

Summary of testing results.

Three different strainer assemblies were tested by a pull horizontal to the ground on the upright 600 mm from ground level. The pull was exerted by a tractor fitted with a measuring gauge (in kg. Note 100 kg corresponding to 1 kN Kilo Newton force).

 An 80 mm driven steel post (1.1 m into the ground) was fitted with a STAYblock and a 3-metre stay. The stay was straight (no bends) and attached to the steel vertical with STAYpoints and held on the ground with a STAYblock and wire. (80 mm posts are a common size in WA) 

The assembly held steady to a pull of 3200 kg or 32 kN force.

Conclusion: Both the commercial “kit”   tested and the Fence-Line assembly were very sound and would be more than capable of holding the tension of a 7-line prefabricated fence that, at full strain, that would be exerting about 700 kg of load. Our opinion is that the Fence-Line system is more flexible and is quicker, easier and cheaper to erect than the “kit”. The biggest advantage is that no wet cement is required. With the Fence-Line System the  STAYblock can be placed anywhere and can be fine- tuned very easily. For example, fine adjustments can be made after a wire has been laid to determine exactly the direction of the fence. The fixing system of the stay to the vertical post (STAYpoint) is better and quicker to install than the Commercial “kit” pipe joint.

The problem at Ridgefield is that a large part of the farm (perhaps a third) can get very wet if the winter is prolonged or if above average rain has fallen. The worry then is that strainer assemblies might be pulled out of the ground.

Fence-Line’s experimental idea to help keep strainer  posts in the ground involves welding two steel arrows/ barbs to the bottom of the strainer. The arrows that we used had a surface area of about 4 cm sq.

    strainer-post-barbs-002

The following posts were tested for their resistance to being pulled upwards (jacking) with a tractor and load cell measuring device (kgs)

1.  A standard post driven into a damp area (200 m north of the main fertilizer shed) required 250 kg to be pulled.(2.5 kN upwards pull)

2. Two posts with welded arrows and driven into the same damp area required about 650 kg to be pulled. (6.5 kN upwards pull) One set of arrows was welded on the angle and on another post welded along the line of the post. Both posts required a similar force to remove them (650 kg). Arrows seemed to make little difference to the force required to DRIVE  the posts into the ground.

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