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Ground anchors are an ideal way of providing temporary ground support during the construction of foundations.

Specialist installers Topbond recently undertook such a project at a new academy being built in Sussex.

In order to ensure stability, the excavation was undertaken in four phases, with each level being secured with Platipus Tendon Anchors tensioned against A142 mesh.

The first phase was excavated using a combination of hand excavation in areas of known services and a 3.5 tonne tracked excavator, creating a 70 degree profile angle.

 1200 gsm polythenene  sheeting was placed on the face and secured with stainless steel pins.  A142 mesh was then cut to size and S06 Tendon Anchors installed at 90 degrees to the slope face to a depth of 3,2m at 1m and 2m horizontal centres, with 1m of tendon left exposed to allow for the tensioning of the anchors.

By feeding the exposed tendon through a hollow hydraulic stressing jack and securing it with a suitable wedge grip, the hand operated hydraulic pump could then be used to pull the tendon providing the specified load of proof loading 25 kN and locked off at 17 kN.

The same procedure was then followed for each of the subsequent phases until the required depth was reached.