Foundation work for asphalt plant manufacturer Benninghoven’s new factory has just been completed using soil stabilising equipment from Benninghoven’s sister businesses Wirtgen and Hamm
Asphalt plant manufacturer Benninghoven is investing €130M (£114M) in a new factory in Germany but the sloping site in Wittlich called for some major earthmoving and ground stabilisation. The scale of the development – covering 310,000m2 – meant that standards were high in order to minimise the risk of differential settlement.
“The height difference was originally up to 9m and levelling the area required moving 400,000m3 of soil,” says Benninghoven production engineer Heinrich Plein.
The main contract for the new factory is being delivered by Strabag but the ground stabilisation work was sublet to EBS Bodenstabilisierungs.
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While Benninghoven is keen to gets its new factory up and running, the ground stabilisation is a demonstration project for the company’s sister businesses with two Wirtgen soil stabilisers and up to six Hamm compactors being used on the scheme. EBS used the soil stabilisers to mix in a lime-cement mixture tailored to the soil characteristics in up to 12 layers, each 400mm deep.
Once the binder had been mixed in, main contractor Strabag used the Ham equipment for the compaction work. The first passes were completed by multiple compactors with padfoot drums working in pairs or trios. Two further compactors with smooth drums then saw to the final compaction.
“All the load-bearing capacity and compaction values measured met the requirements of the construction contract,” says SBT building materials inspector Eduard Weber who oversaw road and construction lab testing for quality assurance. He described the work as “a textbook example”.
Construction of the new factory is now well underway and the road surfacing will also be a family operation with the asphalt coming from one of Benninghoven’s first mixing plants which is located nearby in Ürzig. The factory is set to open this summer.