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Another GRP Lining Success for iLine in the East Midlands

Frequently, our clients contact us with a specific culvert problems that they may have, and these problems can often seem insurmountable. Such was the case when iLine were approached by the Rail Operator with a problematic & failing open-ended brick arch culvert in the East Midlands region. As the culvert in question was a critical structure, carrying high flows and providing structural stability to the rails, a solution needed to be found that could provide long-term stability to the supporting ground, whilst meeting all environmental and safety KPI’s, but remaining within the cost-framework. The actual location of the culvert was within an SSSI (site of special scientific interest), heading out under the railway, with the end-access point located in a private land area.

In conjunction with the Network Rail framework contract arrangements, iLine Technologies developed a GRP solution feasibility, and produced the design & construction works to meet all of the targets set by the client. After mobilisation, and following the intense cleaning process, several major structural defects were identified within the superstructure, and the design was subsequently adjusted to suit the new parameters.

iLine pre-rehab Culvert


As the culvert was an 1800mm x 2000mm section (which is a size that is not available in the UK), the GRP units were manufactured in the middle-east (using a bespoke one-off mould), and shipped to England within the specified 3 week lead-in period. As the culvert required multiple flow diversions, the overpumping system that was installed by iLine was more complicated and involved than that of a standard culvert, but with the assistance of our specialist supply chain, an effective solution was devised that coped with all the flows, thus alleviating the risk of the embankment being scrubbed away.

The iLine specialist operatives then installed the GRP segmental units over a 3 day period, completing the jointing, alignment and final checks prior to the commencement of the grouting process, which involved the use of a special PFA enhanced grout, installed by traditional methods. On completion of the grouting process, the culvert was given a final clean-through, with the final CCTV & walk-through inspection taking place prior to final testing, commissioning and handover.

iLine post-rehab Culvert


For more information about iLine (the CIPP lining division), iDrill (the directional drilling division), iGroup, and our other trenchless technology products & services, contact Nick Sheehan or John Beech at iGroup on 01604 580059 or visit the iGroup website. Further details are also available on Twitter and Facebook.

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