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flat ground so that guy rope lengths are equal. A circular area of 6 meters diameter is required for
the guy ropes to be located.
Ground Anchor Installation
Ensure the chosen location for the ground anchor is free from any buried services such as electrical
cables, gas pipes or drains. The general method of installing the anchors is to drive them in with a
hammer – a slide hammer with a runner that can locate on the M16 anchor thread is the best way. A
heavy hammer will be most effective however many short blows will ensure that the anchor screws
into the ground with minimal disturbance to the surrounding earth. If obstacles such as tree roots,
bricks or stones are encountered then a few heavier blows will normally send the anchor through
such items. Again care should be taken that such obstacles are not buried services.
The required pull force for each of the 4 guy rope ground anchors is 276 Kg (2.76 kN) for a 50-year
maximum wind speed of 52.5 m/s (117 mph). The type of ground anchor supplied is a 50mm X
650mm long Spirafix. By using the above graph it can be calculated that even in a low cohesive
granular soil the specified ground anchor will be sufficient and resist being pulled from the ground in
