Louvresses overpass — Ateliers 2/3/4/

Louvresses overpass

Louvresses overpass

Location

Gennevilliers

Clients

Conseil Départemental des Hauts-de-Seine / Hauts-de-Seine Departmental Council

Team

Ateliers 2/3/4/ (Architect) + WSP-BG (consortium leader) - BET Structure / Civil engineering + Coup d'Eclat - Light conceptor

Nature of the project

Mobility and engineering structures

Program

Creation of a 70 m span over the A86, as part of a north-south green link between the Louvresses business district (6,000 jobs), Gennevilliers RER C station and the Chanteraines departmental park.

Mission

Architectural design of the overpass

Status

Built

Area

70 m span x 4 m width

280 m2

Calendar

Studies 2019-2020

Construction: 2021-2023

Completion: 2023

Inauguration: 2024

Construction compagnies

VINCI Construction - GO/Civil Engineering + VIRY FAYAT Group - Steel structure + WATELET TP - Plants, roads and utilities + VIOLA Group FIRALP - Lighting

Credits

Simon Guesdon (Photographs) - Ateliers 2/3/4/ et CDHS (Night photography et graphics)

Designed by WSP France/BG, Ateliers 2/3/4/ and Coup d’éclat, the structure is an integral part of the creation of a north-south green link between the Louvresses business district (6,000 jobs), Gennevilliers RER C station and the Chanteraines departmental park. This route required a 70 m span over the A86.

The major challenge was to protect users from the motorway and railway environment by providing a feeling of safety and relative isolation throughout the crossing, based on three principles:

Define a protective envelope 4m wide created by a mesh similar to a canopy

Treat the path of users as a cocoon separate from the structure

Define a profile with a very taut arc to reinforce the image of the crossing.

Treated in UHPC (ultra-high performance fibre-reinforced concrete), the deck and railings are combined into a single continuous form, like a protective cocoon that extends beyond the structural envelope to support the movement of users.

The 70 m span of the structure, with no possibility of installing an intermediate pier, called for a steel construction solution. It also needed to be installed quickly over the motorway, which could only be closed for a few hours at night.

A unique architectural landmark, the footbridge offers a unique crossing experience by day and night.