SPECIAL WORKS
Repairing a DN375 concrete pipe collapse
Contractor PBF Drainage was initially tasked with carrying out a CCTV survey for a client due to sewage showing at ground level on a treatment works.
On completion of the survey, it was discovered that the short section running under a concrete chamber housing multiple electrical cables and some additional pipework was in urgent need of repair.
The client excavated on the first initial location which was approximately 6 m in length and 4 m in depth. Initial inspection showed the pipe obvert had completely disintegrated. The pipe walls were about 10 mm thick from around the 9 o’clock to 3 o’clock positions. The CCTV survey showed that the pipe obvert in the unexcavated section was also at serious risk of collapse due to missing sections.
Due to the severity of the condition of the pipe, a fast reliable and strong repair was required. PBF Drainage was tasked with finding this solution. Excavation was not an option as the use of Vac-Ex equipment, could not reach over the initial excavation safely and the use of any sort of heavy equipment meant that the pipe beneath would be likely to collapse.
Measurements taken of the pipe and inconsistencies in size and shape meant the contractor needed to offer a solution that would be suitable.
Along the pipe length, the diameter varied from DN450 to DN375 which was the original size and the size of the upstream section which was of Vitrified Clay pipe construction.
After speaking with its supplier, Terry Ingleby of S1E in Barnsley, PBF Drainage found that Quick-Lock, a localised repair system, suited the project requirements.
QUICK-LOCK
Quick-Lock is an entirely mechanical, seamless assembly system for localised repairs inside pipes ranging from DN 150 to DN 800 (and over 2 m on request) in any common wastewater, well or drinking water pipe system.
Quick-Lock units are a specially manufactured stainless-steel
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| February 2022 |
www.draintraderltd.com
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