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Allington, Electricity from Waste Plant Client: Kent Envropower Designers: HOCHTIEF Form of Contract: Bespoke Lurgi Requirements Dates work carried out: 2004 - 2006 Value: £33,000,000 HOCHTIEF (UK) Construction designed and constructed the Civil and Building works which house the process plant where up to 560,000 tonnes of household waste from Kent is to be recycled and the remainder incinerated. The heat generated by the incineration of the waste will produce electricity from a turbine, which will then be fed into the National Grid. The plant is situated in an old quarry near Maidstone in Kent. The pit to the house and the three large incinerators are formed within a diaphragm wall t a slab level 16m below the existing made ground through the remains of the original rag stone rock. The main building covers an area some 180m by 70m and was constructed using a steelwork frame with cladding. The roof levels are up to 26m above the existing ground and planning permission requires that the plant is hidden by earth bunds constructed up to the same level as the roof. The construction of the bunds required 450,000m3 of material to be excavated within the boundary of the old quarry to be placed on top of the existing bunds and to form new bunds to complete the landscaping. Within the plant are two large RC concrete bunkers into which the waste is tipped before it is shredded, and another where the shredded waste is stored before it is incinerated. At the south end of the plant is a large hard standing area containing weighbridges, where lorries wait until being called forward by means of traffic signals to tip inside the building. There is also a perimeter access road around the whole of the plant. The main plant building contains the control room, offices and facilities for the plant operatives. Away from the main building is an administration and visitor centre where the incineration process can be demonstrated to interested parties |
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