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Supplying drinking water to the town of Thonon

A daunting challenge, given the Allinges and Lyaud mountains, to be met with an MTBM!

A portion of the water supply pipe, dating from 1936, which links the catchment point in the natural springs of the Blaves galleries (Lyaud) to the Chavannes reservoir (Allinges) was collapsing and in need of replacement.

This is a particularly significant operation for the Thonon conglomeration and its users, as the network in question supplies 90% of the town of Thonon-les-Bains and ensures safe water for more than 30,000 inhabitants.

Given the local topography (a hill over the pipeline) and the need to intervene at great depths (more than 20m for some sections of the pipeline), the replacement of the old pipeline was carried out by boring with an average incline of 0.75% in a complex geographical context.

The works required the creation of two shafts: an entry shaft with piling reinforcement at 4m deep, and an exit shaft with secant piling reinforcement at 9m deep. Boring by microtunnelling enabled the laying of a 1,200mm-diameter concrete pipeline along 24m. Two intermediate thrusting points distributed the effort applied to drive the microtunnel boring machine (MTBM) At the same time, a by-pass solution was implemented pending the commissioning of the new network.

As the exit shaft was located in the catchment area, a by-pass pipe and a temporary standby pumping system (2 x 350m³ per hour) were maintained in place for the total duration of works.

The project also included a large water gate chamber, designed for the gravitational distribution of water flows, and various junctions.

Microtunnelling works were entrusted to SADE Special Works, and to the Grenoble Agency (Centre-East RD) for the laying of the by-pass, shaft excavation, building and equipping of the gravitational chamber, and the laying and connection of a 500mm-diameter cast-iron pipeline inside a 1,200mm-diameter sleeve.

This was the first time the microtunnelling technique has been used in the Thonon conglomeration. These trenchless operations helped to reduce to a strict minimum the impact of works to vehicle traffic.

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23-25 av. du Docteur Lannelongue
75014 Paris

  • IN BRIEF
    • Profile
    • Anchoring
    • Path
  • PROFESSIONS
    • Systems
    • Infrastructure
  • SERVICES & SOLUTIONS
    • Regional authorities
    • Industries
    • Major infrastructures
  • REFERENCES
  • CSR
  • APPLICATIONS
  • NEWS
  • CONTACT

Legal notice Ι Anticorruption code of conduct Ι Occupational gender equality index Ι Personal Data Protection Policy Ι Suppliers relationship © 2021 All rights reserved

Fraud Warning

It has come to our attention that emails have been sent by individuals falsely claiming to be SADE employees. The objective of these emails is to place false orders using our company’s name. Read more…

In the emails detected to date, the fraudsters are writing from the addresses “[email protected]” or “[email protected]”. They use our logo and Paris 75014 address.

We wish to draw your attention to the fact that these email addresses do not correspond to SADE’s email address, which bears the domain name sade-cgth.fr.

We thus advise caution in your communication and request that you do not exchange documents or information with persons other than your usual contacts at SADE. If you are in any doubt, we advise you to speak to your usual contacts prior to the transmission of any document or information.

As fraudsters regularly change their operating mode, we also recommend you alert all your employees likely to have dealings in this area (purchasing, accounting or payroll, etc.).

SADE systematically lodges an official complaint in response to such acts. We would be grateful if you could notify us at the following address of any contact you may have had with individuals claiming to be employees of our company: [[email protected]]