Living space arises out of a problem zone

Walls and shaft built in confined space on arterial road in Paris

Data & Facts

  • Project
    • Upgrade of Quai Clichy / Charles Pasqua, Paris (FR)
  • Contractor
    • COLAS Génie Civil, Saint-Denis (FR)
  • MEVA systems
  • Engineering and support
    • MEVA Systèmes de Coffrage SNC, France

Reconstruction measures bringing relief

The construction company COLAS Génie Civil solved a congestion hotspot problem in Paris by means of MEVA technology. Mammut 350, STB support frames and SecuritBasic were used for the single-sided formwork.

Paris is worth a visit – for tourists, bohemians and lovers. Motorists, on the other hand, need a lot of patience. For example, on the route départementale RD1 that meanders along the Seine like a constricted artery. Where the Quai Charles Pasqua meets the Quai de Clichy and another endless stream of traffic rolls in from the Pont d’Asnières bridge, the result was generally total gridlock: traffic jams and stress, and no room for cyclists, pedestrians and local residents. But now people in the Clichy and Levallois-Perret districts are breathing a sigh of relief.

Reconstruction measures bringing relief
A 1.2 km section was extensively modernised by the construction company COLAS Génie Civil. After two and a half years of construction work, new roads at ground level and a roundabout have got things moving again. In the spring of 2021 a new underpass built below the newly developed area will relieve the congestion even further. To successfully implement at times complex tasks in a confined space, the COLAS project team relied on MEVA systems for the single-sided wall formwork. The robust Mammut 350 panels, the compact but nevertheless strong STB 450 support frames as well as the SecuritBasic safety system with convenient assembly and access platforms were assembled to form stable units. The constructions transfer the fresh-concrete pressure of approximately 50 to 75 kN/m² from the formwork into the foundations via the support frames. After completion of each section, the entire units were relocated by crane to the next point of use. Due to the inclinations and curved routing involved, every joint between the formwork panels had to be individually adapted. Four outer walls were formed with lengths ranging from 32 to 37 metres and heights from 1 to 4.50 metres, and also two inner walls with lengths of 62 and 64 metres and a height of 4.50 m, with wall thicknesses of 70 cm.

Particularly challenging was a 9-metre-deep shaft with even thicker walls, which served to access the water tank and equipment room below the road. Here, surface water runoff is collected and pumped off. After forming the floor slab, the construction work proceeded swiftly up to street level: one cycle up to 4.50 metres and a second up to the surface. So far, so good. However, it was not possible to anchor the walls, as there was a risk of damaging the sealing. There was also insufficient space to use support frames for single-sided tying in the shaft, which measured only 3.50 x 2.00 m. Thus, the COLAS team led by construction manager Francis Barth placed Triplex heavy-duty brace modules horizontally between the Mammut 350 formwork panels. To guarantee stability, all four sides were poured at the same time. Die Revit 3D depictions from MEVA proved to be very useful during the construction work.

The first objectives have been achieved: traffic flowing, reduced noise pollution and optimum development of the urban districts. Wide pavements and cycle paths are now being prepared with green areas and a promenade along the bank of the Seine. The erstwhile problem zone is turning into living space. Construction manager Francis Barth is satisfied with the progress of the project: “The MEVA equipment is fantastic. Mammut 350 and the STB support frames – this is my favourite combination for single-sided wall formwork: solid, strong, practical and unyielding.”