GHK Piling was engaged to build a new retaining wall to replace a failing retaining wall without undermining the house or the driveway. The retaining wall is 36 metres long and 2m high. The wall was constructed with 6m 350 SED poles drilled 3.6-4m into the ground with a minimum embedment of 2.0 m into firm sandstone.
The project was challenging because of the restricted access to the site, thus all of the work had to be completed with a 6T excavator. It was important to have an excavator operator who was highly skilled at drilling to drill rock with a small machine without doing damage to the gear. All of the unloading of materials had to be done at a laydown area at the top of the site behind the house & then moved down a 30 metre track to the retaining wall site using the 6T excavator.
The building of the new wall had to be completed in stages as not to completely undermine the existing retaining wall. We demolished the existing retaining wall in sections and rebuilt the new wall prior to commencing demolition on the subsequent section of the wall. Full demolition or collapse of the wall. Full demolition or collapse of the original retaining wall would have placed the house & driveway at great risk of movement or slippage.