Bunratty bypass ROAD BASE LOAD COMPENSATION BUNRATTY, IRELAND – 2005
Sub base compensation
The N18 was constructed 15 years ago over softsub-soils which are now thought to be where the local river used to flow. The west bound section of the dual carriageway has settled quite substantially within 5 areas along the stretch adjacent to Bunratty Castle. Leca 10-20 mm was used to replace the heavy road construction materials originally used to the underside of sub-base. Leca 10-20 mm was delivered by a 5.000 m3 capacity ship directly into the port of Foynes, not far from the site and then transported over a period of 2 days in 60 m3 high sided artic tipper vehicles and loose tipped into a storage bund local to site. Whilst the repairs were taking place, the west bound N18 traffic was temporarily moved onto the east bound carriageway reducing the N18 into a single carriageway. For this reason, time was limited and speed of installation was essential. Once Clare CC had excavated the first of the 5 areas that needed to be re-levelled, the Leca was transported from the storage bund and tipped directly into the void. The Leca was then compacted using a 360 degree excavator in 1 metre layers, the same equipment that was being used to distribute and level the Leca across the subformation. The use of Leca 10-20 mm provided a simple lightweight repair solution to the existing carriageway. The design was expected to achieve a minimum 20 year design life. The installation was very quick and simple and the contractor, Clare CC works department were happy with the speed in which they were able to carry out the works and re-open the busy N18 to traffic.
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IRELAND TECHNICAL DATE OF THE PROJECT Contractor: Clare County Council / National Roads Authority (NRA). Place of job: Bunratty - Ireland. Date of application: June 2005. Quantity: 6.000 m3. Type of material: Leca速10-20 mm. Time table: 17/06/05 - 25/07/05.
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