Road embankment WEST MARSH RENNAISANCE, GRIMSBY, ENGLAND – 2005
Road embankment
construction is
Phase 2 of the West Marsh Renaissance scheme in Grimsby. The whole scheme which will consist of phases 1 - 3 will form part of the infrastructure to a proposed new retail and leisure park and a new housing scheme. The land is currently owned and being developed by P&O. Phase 2 consists solely of a new integral bridge that will allow access into the new development over an existing railway track off Cromwell Road. The existing ground conditions either side of the rail track are extremely boggy, particularly on the north side were the ground forms part of an old land fill. Excessive loads adjacent to the track need to be avoided to eliminate the possibility of heave and distortion to the track. Leca has been designed as bulk fill within the approach embankments to the bridge – 20,000 m3 to the south and 25,000 m3 to the north. Leca® is being used as the most cost effective solution to this scheme due to the considerable weight reduction when compared to that of general fill. Due to the increased depth of compaction layers and the increase in haulage capacity when compared to general fill, the main contractor, Norwest Holst also found a considerable reduction in programme time for installation proving another considerable cost saving. 9 x 5000 m3 capacity ships discharged LWA directly into stockpiles at Grimsby dock ready for call off from site in Grimsby, 5 minutes journey by wagon. The LWA 10-20 mm was delivered in bulk to site in 50 m3 capacity articulated tippers and tipped directly into the void. Tracked excavators and dozers moved the material into position, then tracked and compacted with 3 - 4 passes of the same vehicle. Installation is extremely quick and easy by nature of the material together with large compaction layers. The LWA embankment was wrapped with a geotextile to prevent migration of fines from the capping material as the embankment is constructed.
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ENGLAND TECHNICAL DATE OF THE PROJECT Designer: White Young Green Contractor: Norwest Holst Place of project: UK - Grimsby Time table: October ‘05 - January ‘06 Quantity: 45.000m3 Type of material: Leca® 10-20 mm
construction is