Gwaelod Y Garth Lane, Merthyr Tydfil

Project Description

This 20m long earth retaining garden wall required strengthening to prevent further uncontrolled leaning. As the wall had begun to lean out onto a road, Protectahome were contacted by the building Warranty Provider to solve the problem.
This 20m long earth retaining garden wall required strengthening to prevent further uncontrolled leaning.

The rotation had likely been caused by the presence of a soakaway in close proximity which had introduced hydraulic forces and softened the retained earth behind the wall.

It was also noted that the wall did not have sufficient weep holes and had been repointed with sand and cement rather than a lime based mortar, which would have allowed the wall to dry naturally.

As the wall had begun to lean out onto a road, Protectahome were contacted by the building Warranty Provider to solve the problem.

In coordination with the manufacturer, Platipus, it was decided that 22 No: Platipus S08 Ground Anchors were to be installed along the full length of the wall in two tiers at 1.5m staggered centres.

A load bearing test was undertaken on site to confirm that the proposed system was suitable and that the ground anchors could bear the required load.

Diamond Drilling was used to form the required holes within the wall to receive the anchors. Whilst drilling was underway the cores were preserved intact.

The upper tier anchors were machine driven to a depth of 6m at a decline of 15 degrees whilst the lower tier anchors were driven horizontally to a depth of 7m. Following this, the anchors were loaded and tensioned and the terminations fixed with hidden plates within the wall.

In order to improve drainage, 10 No: 50mm weep holes were formed at the base of the wall.

Following the installation of the anchors, the preserved cores were rebedded in lime mortar leaving no sign of the extensive structural work completed.

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