SPECIAL WORKS
Groundforce Shorco used KD6 overlapping steel sheets to line most of the excavation but those along the western side were interlocking GFI sheet piles.
The western side of the excavation was open-ended and too narrow to close the end. Therefore, there was risk of lateral movement of the Mega Beam on the western side. Hence why it required interlocking sheet piles and to weld the
beam to the piles. Because they are interlocking, the GFI sheets act more efficiently in restraining the lateral movement as opposed to KD6 lapped sheets.
Similarly, the MP60 props were used to accommodate the narrow space to the north and west sides of the access chamber. The MP60 is a mechanical prop unlike the hydraulically-extending MP50 and MP150 units. These were the only
props that would fit into the narrow space [about 2m] down the two sides of the excavation.
With the excavation supported, ESD is now able to work safely around the outside of the access chamber, installing the pipework and completing the structure.
Work on the first phase of the Mannofield WTW upgrade is now on track for completion later this year.
Innovative trenchless solutions Overcoming pipeline challenges beneath a live runway
McBreen Enviro UK successfully installed a 95-metre-long liner beneath a live air traffic runway, facing the challenge of a complex diameter transition - from 900mm at the inlet to 750mm approximately 60 metres down the line. The project required detailed site assessments, precision CCTV surveys, and thorough preparation, including robotic cutting, to address the pipe's deterioration and avoid puncturing the liner during installation. The skilled lining technicians and project management team devised a trenchless solution to avoid disruption to runway operations.
The pipeline was severely compromised, showing significant displacements, cracks, and collapses, which required a solution that could accommodate the
diameter change without sacrificing structural integrity. McBreen Enviro UK employed a custom-designed UV-cured CIPP liner, which, due to its size and weight, was winched into position. The liner was then capped, inflated, and cured using UV light to ensure a durable bond with the host pipe.
This method minimised disruption to surrounding infrastructure and reduced project downtime, addressing the technical challenges posed by the site. By leveraging innovative trenchless technologies and advanced equipment, McBreen Enviro UK delivered a robust and long-lasting solution.
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| November 2024 |
www.draintraderltd.com
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