Issue No.4: Update on construction mobilisation of EnviRecover
Excavation of the pit in which the main plant building will sit, is now around 80% complete with the excavated material transported to Hill & Moor where it will be put to good use. The site hoarding is now up and the temporary site compound is to be relocated to the southern boundary of the site, adjacent to Oak Drive, in the next couple of months, as more site management and construction workers start to arrive.
The next major work involves piling (by contractor Van Elle) to retain the excavation and (by contractor Balfour Beatty) to support the main structures. The construction of a ‘secant pile wall’ will comprise some 700 bored (not driven) piles to retain the excavation, supported by ground anchors. The guide walls for the piling are being constructed now. The piling works will last for up to three months starting early October.
Concrete works for the main building slab and pile ‘caps’ will commence in early November and last up to six months. In the base of the main excavation, a further excavation some nine metres deep will form the waste bunker, which will be retained in a similar manner. The bunker walls will be extended upwards using a concrete construction method known as ‘slip forming.’ This is a continuous operation which will require a limited period of 24/7 operations over some 15 days, commencing late January/early February 2015.