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Friedland shaft in Paris (Eole project)…

November 9, 2020

A flagship worksite featuring an original technique developed by the experts of SADE Special Works.

Currently, SADE Special Works is handling the earthworks for this 24.25m x 7.45m, 43m-deep rectangular shaft.

Context

Positioned in Paris on Avenue Friedland, which stretches from Boulevard Haussmann all the way to the Arc de Triomphe, the “Friedland shaft” will provide ventilation and emergency access for the future RER E regional express train station by 2022.

It is nestled in a dense urban environment, surrounded by sensitive sites: RER Line A, which runs 4.85m from its walls and the many Haussmannian buildings lining the avenue. So compacting caused by the works must be limited as much as possible to avoid any disruption.

Earthworks using a tunnel boring machine

For these reasons, when it submitted its bid, STS proposed using a tunnel boring machine for the shaft’s earthworks. This technique consists of creating the civil engineering slabs (levels, stairs, walls, etc.) in advance of the earthworks rather than at the end, as is traditionally done.

With this technique:

  • less noise pollution for locals because noise is attenuated by the different slabs forming the levels of the shaft;
  • the schedule is streamlined by eliminating the traditional strut setup/removal stages;
  • reduced wall movement and, as a result, lower surface compacting risks.

BUT… two kinds of constraints:

  • the need to avoid using temporary hoppers on the different paving levels to be able to continue the earthworks downwards;
  • slightly reduced earthworks speeds.

One specific point: 2 layers of struts

The proximity of RER Line A requires the setup of 2 layers of struts, including one equipped with a cylinder system to apply a prestress force (573 tonnes x 2), further limiting movement.

For this complex setup, 8-tonne components are handled at a depth of more than 30m with only 1.90m of overhead clearance above the parts.

The earthworks will be finished in January 2021 and the carassing in June 2021.

This is one of the major mobility projects in the Greater Paris region extending RER line E 55km westwards. This involves not only newly-built and renovated lines, but also newly-created and redeveloped stations.

Discover the website of STS

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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]]