Repair of civil structures

4m ENGINEERING - SPECIALISTS IN REPAIRING civil structures such AS VIADUCTS, BRIDGES, CONCRETE BUILDINGS

SUBSIDIARY OF THE 4m GROUP

Led by the civil engineer, Pierre Bonhomme, 4m Engineering is a subsidiary of the 4m Group and composes a team specialising in the complete renovation of civil engineering works. Specialization and versatility are the main strengths of the 4m Engineering workforce.

From giving advice to the complete refurbishment of civil engineering structures, 4m Engineering provides its know-how and innovative solutions to contracting authorities.

  • treating concrete,
  • protection against carbonation,
  • replacing expansion joints,
  • complete waterproofing of structures
  • applying new safety standards for different equipment
  • support changes
  • stone masonry 

The production of systems in the 4m Group also provides the services offered by 4m Engineering with made-to-measure solutions: reprofiling and waterproofing of bridge decks, concrete renovation, reinforcement of structures, renovation of facades, reinforcement treatment.

Case study

The Ensival Viaduct

The Ensival Viaduct

In association with Franki, 4m Engineering took part in the renovation of two bridges at the Ensival Viaduct on the E42 Liege-Verviers motorway. The task of the 4m Engineering teams was to repair the concrete, to replace the expansion joints and to reseal them. 

ON THE SIDES AND THE CURBS :

  • Using different techniques, the first stage was to demolish the old concrete that had been impaired by de-icing salts by corbel sawing and using hydro-demolition to recover the reinforcement and manual staking.
  • Next the sides were reinforced by re-covering the old girders with higher performant concrete.
  • Then the teams applied a projected resin seal.
  • Safety barriers meeting the new European standards were also put in place along with a noise-reduction screen for the well-being of the residents.

ON THE BRIDGE DECK :

  • The entire roadway system was demolished to expose the concrete slab of the bridge.
  • The concrete was repaired
  • New expansion joints were laid
  • The entire structure was made waterproof
  • The wearing courses were given a hydrocarbon coating
  • The central reservation was replaced by a new one complying with the current safety standards and integrated lamp posts

 

This 3,500 m² project started in May 2016 and lasted several months. 

Surface: Waterproofing: 4,000 m² and hydrocarbon coating: 7,300 m²

Main contractor: SOFICO – SPW Verviers

Period: Summer 2016

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