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Current projects

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SADE Special Works connects Brittany!

Intervention in the framework of a colossal project for GRT Gaz. Due for commissioning in 2021, the Landivisiau natural gas-fired combined cycle power station will strengthen the security of electricity supply in Brittany. At present, the region produces only 10% to 15% of the electricity it consumes and is therefore highly dependent on its neighbours.

Discover the video of the Landivisiau site

To enable its connection to the natural gas supply distribution network, GRT Gaz must lay 22km of 400mm-diameter gas pipeline across the Finistère region. The new network will cross some ten municipalities, starting from a point located on the existing Saint Eloy-Dirinon gas pipeline and arriving at the Landivisiau power plant facility.

Calling on the SADE Special Works experts

This is a highly complex project. In particular, it runs through a Natura 2000 protected area (the famous Quimper snail), the Elorn river and its geological fault, and SNCF railway lines that can only be crossed via micro-tunnelling.

GRT Gaz thus called on SADE Special Works to lay 530m of concrete priming pipes using a 1,800mm-diameter micro-tunneller.

The works started at a depth of 8m, on the same level as the water table, with a 17% incline, before passing under the Elorn. The profile will thus consist of a drop of more than 40m with a water load of over 4 bars. A curved path and the presence of highly abrasive rock add to the technical challenge of this project for the teams.

Along the entire route, the ground is very rocky (alternating gneiss and shale), which increases the wear and tear of the cutting wheels (rotaries and scrapers) on the front of the micro-tunneller, which our operators need to replace about every 70m to 80m. The borehole is progressing at an average speed of 8m per day.

To facilitate the replacement of cutting tools and offset the pressure of the water table exerted on the tip of the micro-tunneller, hyperbaric equipment has been installed; located to the rear of the micro-tunneller, a chamber with inner pressure enables dry and safe operations.

Once this priming pipe is completed, and with CSR in mind, GRT Gaz will naturally be able to provide other utility providers with the possibility of laying their networks through it, i.e. water supply, drainage or optic fibre.

Progress update

Sade Special Works is currently working on the first bend passing under the Elorn and the railway lines. The first metres of digging have proceeded smoothly.

Completion of the borehole up to the natural ground level is scheduled before 15 August.

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

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]]