Rehabilitation of an SNCF drainage collector

Using the Bluelight® technique, particularly adapted to limited-access networks.

In Ablaincourt-Pressoir, the defects observed during compulsory periodical inspections of the drainage collector (250mm-diameter and 3m deep) along the high-speed train line called for the rehabilitation of this collector.

SNCF decided to use these works, executed by the Non-Inspectable Rehabilitation team from SADE Special Works, as a test project.

The solution requested by SNCF was to sheathe the existing drain to maintain its transport function and to place a new shallow drain on the ground level.

SADE teams set to the task, beginning with the waterproofing of the collector, then sheathing by Bluelight®, which was perfectly adapted to the specific constraints of this worksite (difficult access and limited lead time).

Night works

The first night, 3 skilled workers and a vacuum truck carried out dredging works and robot inspections. On the second night, in 3.5 hours, between 11pm and 5am, 4 workers laid the 90m section using an easily-transportable shooter. The section was then polymerised with Bluelight® LED. Our ability to offer a technique adapted to the working conditions was appreciated by our customer, who was fully satisfied with the result.