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| A medium sized light industrial
estate on the edge of Camberley, the principal challenges
posed by this project came from the ground. The site had
been used as allotments for some time and in more recent
years as an uncontrolled dump and finally a parking area
for the adjoining car showroom. As a result the ground
was soft and variable, with unacceptable levels of carbon
dioxide and a localised problem area with a high water
table and "running sands". Vibro compacted stone columns were installed under the buildings to give a bearing strength of 37.5 kN/m2 under the slab and 100 kN/m2 under the walls and footings. A PVC gas proof membrane was used to prevent CO2 leaking into the buildings. A no-fines sub base distributed the gas to the perimeter where it was vented into the gravel footpath, or using cranked air brick vents into the atmosphere. To prevent differential settlement between the lightly constructed parking bays and the more heavily constructed service road a structural geotextile was used under all paved areas. This had the additional advantage of reducing the site strip and quantities of sub base material required, producing a net saving. It also tied in neatly with the low reinforced earth retaining walls used around the site perimeters. |
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