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A technically challenging project

following the collapse of a 19th-century underground structure in Valenciennes.

In early September 2021, the Valenciennes Métropole Local Authority (CAVM) made an urgent call to SADE Special Works. The vault of a 19th-century gallery, located under Place de l’Esplanade in Valenciennes, partially collapsed following road redevelopment works. This gallery channels the Grand Bruille underground river.

A key facility for the CAVM, the recommissioning of the whole square had to be executed urgently: the road works were scheduled to resume in mid-October on the collapsed portion, and reinforcement works to the structure had to be completed by 15 December 2021.

A sizeable challenge for the SADE Group!

After an initial visit to the site, on 9 September 2021, to determine the type of work required, lead time and estimated cost of the various solutions, the SADE Group rapidly proceeded to a 3D mapping of the facility, in addition to execution and structural designs.

This rapid response was enabled thanks to the synergy between all players, work phases, engineers and suppliers:

  • SADE Engineering was responsible for sizing the TH arch shoring and inspections
  • Ségic Engineering was responsible for surveying, recommendations and sizing of the GRP liner and inspections
  • HPS supplied the made-to-measure mould and GRP liners

As of 4 October 2021, the SADE Special Works teams secured the opening of the collapsed portion and transformed it into a manhole. They then shored 46m of the gallery with TH21/58.

Two subsidiaries of the SADE Group, PERRIER for the micropiles and GECITEC for the traffic load repair platform, intervened to reinforce the gallery on Boulevard Beauneveu, using a distribution slab.

SADE Special Works devoted two months to structural reinforcements along 46m of the gallery, measuring 2.2m to 2.5m high and 4m wide. Works included the reprofiling of the apron, the laying of slide rails, fitting of the specially designed GRP liners, and concrete filling of the annular gap (180m3). For the hydraulic aspect, lastly, up- and downstream tanking was resumed to accompany the changes to gallery sections.

Works were executed in a specific context: in the middle of roadworks, during the COVID pandemic and with incompressible supply deadlines.

Despite these constraints, the challenge was met with brio by the teams who were congratulated by CAVM’s heads and elected representatives for the quality of the works and more especially their compliance with lead times.

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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]]