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A precast concrete holding tank fromKijlstra’s Vario range has helped contractors knock weeks off a programme toupgrade a waste transfer station on Merseyside.



Local contractor LCM Group was employed bywaste firm Biffa to install a new underground liquid waste storage tank at thesite in St Helens. The tank receives and stores liquid run-off from food wastedelivered to the transfer station. When the tank is full, it is pumped out andtankered away for disposal.


“The client’s signature idea was to install alightweight glass-reinforced plastic [GRP] holding tank,” says Kijlstracontracts manager Steve Gainsley. In theory, a GRP tank is light, easy tohandle and requires no special lifting equipment to install.


“The problem is, the specification requiredthe tank to be supported and contained within concrete poured in-situ,”explains Steve. This required formwork and reinforcing steel to be assembledwithin the excavation before the GRP tank was installed and the concretepoured.


LCM maintenance manager David Scott said: “Webrought the idea of using a Kijlstra precast concrete tank to Biffa as a moreefficient alternative. We already knew some of the people working at Kijlstraalthough we’d never used their products before. We looked at the precast optionand quickly realised this was a much better alternative for this project.”


The Kijlstra tank, from the company’s Variorange, is a simple cube measuring 3m x 3m x 3m with openings for pipework and alevel sensor to indicate when the tank needs emptying.


The one potential disadvantage, compared withthe GRP tank, was that a mobile crane was required to lift the concrete tank,which was installed in one piece. “But the crane was only on site for fourhours so it was hardly expensive,” says David.


LCM having dug the excavation and levelledthe bottom with sand, it was then just a simple matter of trucking the tank inand lifting it into position. “The tank was in position within an hour of itarriving on site,” says Steve. “And they were already back-filling theexcavation by the time I left the site.”


LCM’s David Scott says the excavation wasdug, the tank installed and the hole back-filled all within 36 hours. Had aplastic tank been installed, the task of assembling formwork and reinforcement,plus the time taken for the concrete to cure, would have resulted in theexcavation remaining open for several days – or even weeks.


“Basically it saved us about four weeks,”says David. “It was late November and at that time of year you don’t want toleave an excavation open a minute longer than you need to.”


The rapid installation of the tank impressedboth LCM and Biffa, with the result that David Scott is hopeful of repeatingthe exercise for the same client on other sites. “We’re already talking to themabout two more jobs and there could be more after that, too,” he says.


See the installation video at http://www.kijlstra.co.uk/kijlstra-tank-saves-weeks-on-waste-transfer-station-upgrade/.




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