Case study - UV cured lining project wins the day for DALROD
Feb 23, 2016
DALROD recently ventured into new pipe-lining territory using, for the first time, UV cured lining on a project for client Peterborough City Council (PCC)
Urgent remedial works
The culvert carries land drainage run-off waters between dykes that control the water levels in the local fenlands. The road route at the site of the culvert is a busy rat-run, particularly during rush hour and used by commuter traffic, heavy goods and farm vehicles. Inspection of the culvert by PCC showed that, due to its position with its crown at just 2m below the road surface, the structural integrity of the concrete pipe construction was compromised by multi-fractures/cracks and other defects. Had the culvert not been rehabilitated or replaced there was a significant possibility of collapse and damage to the road above.
Limited options leads to UV cured lining solution
Given the very rural aspect of the area, the diversion route would also have required the use of several minor roads which often have steep embankment sides to bring the road level up above the level of the surrounding fens, which would have meant potentially led to significant traffic handling difficulties. With the potential also existing for a high carbon footprint on the project using open cut, it was decided to investigate the rehabilitation options.
Looking at the rehabilitation options meant selecting a lining technique that would ‘fit the bill’. Given the experience of many contractors in the field of lining works, the project was put out to competitive tender however many lining options such as hot water cure and epoxy resin use do have significant leachate from the liner during the lining process and subsequent to the liner installation. As the site was handing land drainage this was not seen as an option that could be utilised.
DALROD’s experience wins the day
The remaining option was the use of a Ultra Violet (UV) cured lining that does not have the environmental disadvantages of other systems. Ultimately, DALROD’s Cambridge franchisee (Mike Pollard’s team) was selected as the preferred bidder for the works, even though the company had not previously utilised UV cure on other operations. However, it was understood that the company’s experience on other lining works, as well as the fact that DALROD was very familiar with prevailing conditions in this part of the country, stood it in good stead for this operation.
So, having established the works site over the culvert entrance, first the culvert was thoroughly cleaned to ensure that there was nothing within it that could impede the lining operation. The culvert was then checked and surveyed using a CCTV camera. The UV liner was then prepared for insertion. Supplied by RSM Lining Supplies of Doncaster, UK, the reinforced UV liner was delivered to site pre-impregnated with the UV sensitive resin. To install the liner a winch was set-up on the downstream end of the culvert and a winch line was passed through. Initially a pre-liner was winched into the culvert which helps to prevent any external friction wear on the final liner during its insertion. The winch was then used to pull the main liner through the culvert into position inside the pre-liner.
Once in place, the whole liner assembly was then attached to an compressor/air blower unit and inflated to ensure the liner fitted correctly. A reinforced liner system was utilised to ensure the long-term integrity of the culvert which once rehabilitated would continue to carry significant traffic loadings into the future.
UV light train
The UV light train was pulled through the liner in accordance with the manufacturer’s specification at a speed that would fully cure the 8 mm thick liner. On this project the cure time for the 19 m run was just about 45 minutes. Once the light train had completed its run the ends of the liner were opened up to retrieve the light unit and the liner ends were sealed at either end of the culvert. The CCTV camera was again passed through the culvert to record the completed liner for client records.
The whole lining operation was completed from arrival on site, through set-up, culvert cleaning, CCTV survey, lining and final survey in just one working day on 13 October 2015, as opposed to the seven working days that would have been required for any open cut operation. The other advantage of being able to complete the works in just the one day is that overall the cost of the project was significantly less than could have been achieved using open cut replacement techniques. The carbon footprint of the project as a whole was also considerably lower.
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