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A first for Lyon…

January 15, 2021

In Lyon, Gantelet-Galaberthier has dug a tunnel 5 metres under the water table and 8 metres under natural ground level, using a standard sheltered technique with jet grouting in the soil mass.

The Lyon subsidiary set itself the impressive challenge of creating the final section of these sewer mains along 180m! This is the first time a gallery has been dug using traditional methods in the alluvium of the Saône river.

To achieve this, a technique had to be devised in order to create a waterproof underground mass, from surface level, around the future location of the gallery, enabling miners to dig and reinforce the facility safely.

In order to avoid the driving of sheet piles in this district in the 9th arrondissement, Métropole de Lyon initially opted for the jet-grouting technique along a 15m test phase.

This technique treats the soil mass by high-pressure injection of cement-based slurry, resulting in an in-situ mixture of soil and cement. A sufficiently tight grid of these columns of jet grouting ensures both waterproofing of the mass and a ground texture which is not too resistant to manual digging.

This innovative solution was definitively approved by the customer after this test phase. Works are thus continuing with:

  • The creation of two masses via jet-grouting columns, including within the access shaft area
  • The creation of 2 access shafts
  • Manual digging of the 2m-wide by 3m-high tunnel
  • Extraction of the rubble from the cutting face
  • Standard shoring with sheet metal and arches

In the second phase:

  • The implementation of frames for the definitive reinforcement of the facility
  • The installation of the tunnel formwork
  • Concreting of the 130-long by 180-high collector.

Congratulations to the teams on the ground who worked so hard to deliver a compliant structure for December 2020.

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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]]