Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/300621
20 WET NEWS April 2014 INSIGHT A GRP UV cured pipe lining system has been the tech- nology of choice for a culvert running beneath the A30 north of Bodmin. A solution: UV cured CIPP pipe lining T he latest name in UV cured CIPP pipe lining is iLine (part of the i-Group of companies), which offers a management and contracting team that can draw on a wealth of experience in the CIPP pipe lining industry. Working in virtually all pipe- line sectors, the company uti- lises the latest GRP UV (Glass Reinforced Plastic Ultraviolet) cured pipe lining system that offers liners that are some 40% thinner whilst being over three times stronger than conven- tional felt liners. One area in which the GRP UV liners show significant advantages is that of culvert rehabilitation. To ensure continued opera- tion of its trunk routes the UK's Highways Agency is undertak- ing an ongoing programme of work to ensure that culverts running beneath its roadways continue to operate effectively and efficiently. A recent project completed as part of this programme was the lining of an old ARMCO cul- vert running beneath the main A30 trunk route to the north of Bodmin in Cornwall, close to Bodmin Racecourse, which was undertaken to strengthen it for future operations and to ensure that it continued to be able to handle the increasing traffic flows on this major tourist route into the far South-west. The lining project was awarded to iLine Technologies, which was required to design a suitable lining to meet the needs of the culvert refurbish- ment whilst minimising disrup- tion to the road operation. Low footprint With project consulting engi- neer Kate Sutton, and given the ground investigation results and traffic loading information procured, iLine proposed to uti- lise a CIPP lining technique with Ultraviolet (UV) curing for the 58m long lining run in the 1,000mm diameter culvert. The design called for a liner wall thickness of 9.3mm. As well as offering a quick, low footprint site operation, as compared to other CIPP options, including hot water cure and steam cure, the UV option was also deemed to be far more environmentally- friendly with less potential for pollution down-stream of the site due to the absence of run- off wastewater subsequent to the cured liner being opened at the culvert ends post-curing. The UV equipment used for the installation was an REE2000 curing unit supplied by Reline Europe, which on this occasion utilised a UV light source com- prising of six, 2,000 watt UV bulbs. The liner itself was also pro- vided by Reline Europe and was precisely manufactured and fac- tory impregnated with the UV sensitive resin to fit the lining run. The lining project started on September 9, 2013 and was com- pleted with the iLine crew off the site three days later. The challenge: Trenchless technology The beauty of the UV system in situations such as this is its speed of opera- tion. On the first day, the crew mobilised to the project and set up the necessary equipment and work site. On Day 2, civil works to remove the old head wall on the culvert were com- pleted, and on the last day, subsequent to inspecting the culvert to ensure it was clear to line, the UV liner was installed in just eight hours, including the curing process. On the day of lining, work started at 8am. The liner was inverted into the culvert using compressed air. The UV light train was then inserted, the liner re-inflated and the curing run started. On average the cure was completed at a speed of some 6m every ten minutes or a complete cure in under two hours. Disruption The only aspect of the project that involved outside agencies was that a land agent had to be contacted because the down- stream section of the culvert ended in a farmer's field with the farmer having to be informed of the works. The upstream section of the culvert lay within the boundary of the highway so did not cause a problem. Commenting on the project for the client, a representative of Enterprise Mouchel says: "Our thanks go to iLine and its crew which undertook and completed a very tidy job. We are very pleased with the out- come of the project, in particu- lar the lack of disruption to the public, traffic flows above the culvert and especially the elimi- nation of the potential for pol- lution that can arise using other CIPP systems. Overall it was a quality job completed to a high standard by an experienced, well-man- aged crew. We will be passing on our comments to our manag- ers and QS team." According to John Beech, business development manager for iLine: "Some of the biggest A view through the completed liner Preparing the UV cured liner for insertion • "Some of the biggest advantages of using the UV method utilised here were the speed of the installation, with the whole project being completed in just under four days" John Beech, business development manager, iLine advantages of using the UV method utilised here were the speed of the installation, with the whole project being com- pleted in just under four days and the fact that the use of the UV also meant that, given the proximity to farm land, the potential for pollution was eliminated from the site because no liquid run-off is generated using the UV system." Beech says: "UV lining is a technique that is currently not the most widely available in the UK as there are only a few installers using the system. We at iLine pride ourselves that we have crews that are some of the most experienced in the field in the UK today with numerous successful projects under their belts." n