Sheetpiles installed with hi-frequency vibratory driving heads are an efficient way of providing a semi-permanent or temporary shoring solution. Whenever sheetpiles are to be installed near existing structures caution and consideration needs to be given to the potential impact of the vibration on those buildings.
There are a couple of solutions which easily overcome this concern. The first is to inject the soil under the foundations of the existing structure with a product such as SoilCem (a high quality microfine cementacous grout) to ensure there is no soil consolidation or movement under those foundations. The second solution is to forego the typical sheetpile option altogether and install screwpile columns and retaining steel sheets. There is no vibration associated with either the installation of the screwpiles or the steel sheets.
Of all the soil retention systems available a SoilCem microfine grout solution is considered the best method pf soil retention and shoring in sandy sites. It provides a vibration free none intrusive and no heavy equipment option. For more information on this technique please click on & visit FONDEX.
For sites where SoilCem grout injection is not suitable the screwpile shoring system is ideal. A screwpile shoring system can be partially reclaimable. Screwpiles may not be reclaimable due to accessability issues. These can remain, or are cut-off at the lower ground level.
Screwpiles and shoring sheet can either be installed prior to excavation or can be installed on a sensative site which has already been partially excavated and is experiencing an overlooked soil slip problem. Screwpile shoring depths of up to 2.5m can be supported without the need for horizontal ground anchor installation.