Careys Civil Engineering was contracted to construct roads with supporting utilities for a new residential development at Broughton Manor, Milton Keynes, on a site which had previously been used as farmland. The first phase of works involved construction of 5km of estate roads and the laying of 15km of storm foul drainage, varying between 1m to 6.5m. In addition, 90,000m3 of material was imported to site, levelling the varied gradient. Our remit also included a new traffic controlled junction, the upgrading of an existing highway and the excavation of a balancing pond and 15 headwalls.
The site pond was lined with blue clay, and was able to hold 80,000m3 volume. There are three headwalls entering the pond and one flow control chamber for discharge into an existing stream/watercourse. The second phase commenced once the houses on the development had been built, when we returned to construct paths, replace kerbs, raise ironwork and lay the wearing course to the roads.
Our team was also commissioned to construct a 70m road carriageway, a bridge across Broughton Brooke, a new roundabout and the diversion of 100m of 900mm foul sewer. The road connects the new residential development to the main road and spans the new bridge at Broughton Manor Farm, Milton Keynes. Alongside this, our team constructed roadworks and drainage for the residential development. The bridge consisted of a 22m single span fixed portal which was founded on CFA piles under reinforced concrete abutments and wing walls. A 400t crane was needed to lift in 15 pre-cast concrete beams weighing between 35-44 tonnes.
The works on the roundabout involved the replacement of an existing mini roundabout and was delivered in two phases. The first involved the construction of the bridge, which formed part of one exit from the roundabout, whilst the second, the completion of the works, necessitated the closure of the road and traffic management of the existing flow of traffic.
In addition to this, a “Redway” (cycle path) and conservation way were extended under the new bridge and connected to new routes alongside the Broughton Brook. Our team agreed a major impact plan with Anglian Water Authority for the foul sewer diversion, as the diversion was up to 8m deep and in the flood plane area adjacent to Broughton Brook. The works involved the use of multiple 8inch pumps, pumping 24 hours a day, 7 days a week at a distance of 80m.