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Rennes new congress centre: from historical convent to modern facility

Built in the 14th century, the former Jacobins convent located in the historical centre of Rennes, (France) is currently being transformed into a new congress centre which will open in 2018. This new and modern facility is being built with 18 welded built-up sections supplied by Distribution Solutions France in Yutz.

1,500 hours of work for a remarkable project

The future Jacobins congress centre in Rennes will include different areas: car parks, meeting and exhibition rooms, and an auditorium with a capacity of 1,000 seats.

For this project, the team of Distribution Solutions (DSI) in Yutz provided 18 welded built-up sections with these characteristics:

  • length: between 12 and 18 m
  • weight: between 11 and 19 tonnes (excluding joint bars)
  • height: up to 1.91 m
  • 70 mm flanges
  • 345 bolt holes in each joint bar (more than 3,200 drill holes) with a +/-0.3 mm tolerance

After 1,500 hours of works in Yutz, the 18 sections were delivered to the customer Delattre Structure et Enveloppes for finishing and final assembly. Then, using a special convoy, the welded built up sections – up to 30 metres long and weighing 32 tonnes – were delivered on site in Rennes between October and November 2015. They were used to:

  • form the ceiling of the auditorium
  • support the floor of the exhibition room on ground zero
  • make a heavy vehicle access ramp
  • support the upper floors

An onsite mobile crane was used to install the sections. 

DSI’s experience and support pays off

After several meetings between DSi and Delattre Structure et Enveloppes, the negotiations resulted in a contract of 18 welded built-up sections with joint bars (S355J2 steel plates). The team members of DSI in Yutz were fully involved to make this project a success, coordinating the relationship between the workshop, the subcontractor and the construction site to guarantee optimum delivery. 

ArcelorMittal's experience in the production of welded built-up sections, as well as the knowledge of weld precision and quality, and the advice provided to the customer were definitely an asset for this exceptional project.


Webpage of Distribution Solutions

Photo credits ©Willy Berré


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