A former pharmaceuticals warehouse in Merseyside is currently undergoing a major makeover to create the infrastructure needed for its new use as a waste transfer station.
Galliford Try is working with Van Elle to undertake some challenging indoor piling work to deliver the waste disposal hub in Kirkby for waste specialist Sita.
Galliford has said that Van Elle’s work is progressing well despite initial concerns about selecting the right piling rigs with enough capacity to cope with the sandstone ground conditions and yet work within the headroom restrictions.
Once complete, the site will take all black bin waste from the region and compact it before loading into rail freight wagons for transfer to a thermal treatment centre in Teesside.
To convert the warehouse to its new use, Van Elle is constructing two 38m long, 18m wide and 7.5m deep using 750mm diameter secant piles which will be stabilised through the pile cap by raking 14m long ground anchors.
According to Galliford, the conventional approach to constructing the pits would have used Larssen sheet piles but concerns over vibrations within the building meant that the augured solution was selected. The piles are being cased to 6m through unstable ground before being open holed to 11m for the 35kN male piles and to 8m for the 8kN female piles.
Van Elle will install 45, 20m long tension piles within the base slab of the pits to overcome buoyancy issues due to high groundwater levels. Well point extraction will be used during the construction phase to lower the groundwater to below base slab level.
Piling work is being carried out 12 hours a day, seven days a week in order to meet the tight timescale with handover of the site for M&E fit out in November in order for the site to be operational in June 2016.