AXEO Brumath completes largest pipe lining project in France to date

While sceptical at the beginning, the municipal client, Lille Métropole Communauté urbaine (LMCU), could finally be convinced by the benefits of trenchless sewer rehabilitation with the Alphaliners from RELINEEUROPE. The contract with such a remarkable size was unprecedented to that date. The job was awarded to sewage system specialist AXEO Brumath, France. The project had to be completed within only a few months between March and July 2011.

 

In Emmerin near Lille in northern France, the main intercepting sewer leading to waste water treatment plant had become derelict. The sewage system that had been built in the 70s was showing major signs of damage. Although there was nothing wrong with the statics of the old pipes, excessive corrosion, displaced pipe couplings and penetrating roots were causing leaks in the sewage system. Parts of the pipe system were overgrown by up to 90%. The need for rehabilitation was thus unavoidable. With an overall pipeline length of four kilometres and pipe diameters of up to DN 1200, the rehabilitation project was thus a very demanding project that had to be completed within a very tight time frame. The sewage system runs along a nature reserve which will likely be restructured in mid 2011. "This is the largest project of this kind in France up to this date. Considering the length, diameters and short completion time, the entire French rehabilitation industry is considering this task as a reference project", says Michel Moller, construction supervisor at AXEO Brumath.

 

Up to this date, the GFRP lining system and the UV technology were unknown to the client. The decision-makers were thus somewhat sceptical at the beginning. But the documentation of previous installation results and successfully implemented projects finally convinced the client. In addition, the Alphaliner method from RELINEEUROPE was recently also certified in France by the CSTB (Scientific Centre of Technology and Construction, France).

 

The challenge for the professionals at AXEO Brumath was to complete the project, including all preparation and finishing work within the narrow time frame. The pipes affected are two main intercepting sewers. One of these with a length of 1,255 meters and a diameter of DN 1000 runs from the pumping station at the nearby industrial area and the port Santes along the nature reserve "Le parc de la Deûle" to the waste water treatment plant. The second intercepting sewer DN 1200 that was to be rehabilitated has a length of 3,009 meters and connects the commune Wattignies with the waste water treatment plant. A feed pipe with a length of 243 metres and a diameter of DN 600 leading to this main intercepting sewer has already been rehabilitated.

 

The initial phase involved restoring the segment from the pumping station to the waste water treatment plant. This required the installation of a 1.4 km long water bypass system through which the water could flow from the industrial area to the waste water treatment plant during the construction phase. Michele Moller explains, "Designing the water drainage bypass as a single, large system makes sense. It enables us to perform work along the entire construction site efficiently without any major loss of time caused by e.g. daily sewer cleaning." In this first segment, DN 1000 Alphaliners with a wall thickness of 7.2 mm have been installed over a length of 1,255 metres. The logistics on their own in this respect were immense. The total weight of all installed liners amounts to approx. 236.5 tons. RELINEEUROPE supplied the liners in the lengths required for the respective installation segments. The Alphaliners were then pulled into the sewer directly from the lorry with the help of a conveyor. Also on site was David Veltz from RELINEEUROPE who had already cooperated closely with AXEO Brumath during the preparation phase. "Obviously, entering the French market with such a large project is a challenge for us. But we all acted in concert, from the production employees to the management. That the project was a success is due to the good cooperation between the city of Lille, AXEO Brumath and RELINEEUROPE."

 

Once completed, work on the approx. 3,000 meters long intercepting sewer was carried out. Again, the construction vehicles were only able to drive to the drainage system on specially built construction roads. Thanks to the clever choice of the installation segments and the deployment of two construction crews at the same time, the construction team around construction supervisor Moller was able to complete the construction work even faster than originally planned. Up to five liners were installed per week.

 

RELINEEUROPE opted for various logistics solutions to implement the order. The Alphaliners DN 1000, for example, were delivered in individual boxes. The larger DN 1200 Alphaliners, however, were delivered in overseas containers. The benefits are simple: "With this method, we are much more flexible and also more environmentally friendly, since we do not use disposable packaging. We are thus also able to deliver very heavy liners reliably to the construction site", says David Veltz.

 

On site, the large-dimensioned liners were pulled into the sewer system with a cable winch. By using a 1.5 km long winch cable, the setting-up time between the individual installation segments could be kept to a minimum. Once the liners were inflated, UV light was used for the curing process at a speed of approx. 40 cm per minute. To achieve this, a light train of nine UV lamps with a capacity of 1,000 watt each were moved along the installed liner. The curing process thus only took a few hours even with longer installation sections. Thanks to the clearly structured work and very fast processing method, up to 150 metres of sewer pipes could be rehabilitated on an average work day. Meeting the tight time frame of the trenchless sewer project was therefore no longer a problem.

 

Apart from saving time and protecting the environment, trenchless sewer rehabilitation with UV light curing GRP liners has yet another advantage, according to the construction supervisor Michael Moller: "After 30 years of experience in sewer rehabilitation using hot water as the curing medium, I am now able to compare the two methods. In addition to the advantages for the environment, the UV system also has benefits for the residents. While hot water curing requires the construction site to be manned day and night, this method allows interruptions and can be continued the following day." In his opinion, the system used in Lille is currently the best sewer rehabilitation system available.

 

 

AXEO Agence Réhabilitation Assainissement / Centre d'Exploitation Est

195 Avenue de Strasbourg

F-67170 BRUMATH

Tel.: 0033 3 88 64 59 80

Fax : 03 88 51 80 52