This immersed tunnel under the Fraser River will replace the existing George Massey tunnel on highway 99 between Vancouver and the communities to the south and the U.S. border — which has become outdated and insufficient. It will serve as a vital transportation link, reduce travel times, improve transportation safety, and offer better public transit options. It includes:

• A twin-tube immersed tunnel with 4 traffic lanes in each direction, 2 of which are dedicated to public transit, with a total length of 1,100 meters including cut-and-cover approach sections; the immersed sections have a total width of 45 meters
• A multi-use path for pedestrians and cyclists between the two tubes
• A new bridge over the Deas Slough with 2×4 lanes, 380 meters long
• Access interchanges
• Various structures, retaining walls, etc.
• Technical buildings for ventilation and services

The innovative and advanced design solutions of the immersed tunnel will prioritize sustainable construction practices.

Upon completion, the existing tunnel will be dismantled.

As part of this project, INGEROP, together with its subsidiairy, Rendel, is responsible for the independent category 3 verification of the tunnel.

This mission includes validation of the design studies and independent checks of the critical structures (tunnel, viaducts), helping to identify and mitigate risks.

As part of a maintenance programme dedicated to repairing the anticorrosion protection of the metal frames of engineering structures on the VINCI Autoroutes network, our teams are carrying out a design and build project for the repainting of four engineering structures. The bridges are of the prefabricated post-tensioned girder type (VIPP) and were widened between 1995 and 2000 with the addition of steel girders.

Work was completed at the end of 2024 on the first two bridges, located in the communes of Auberives-sur-Varèze (Isère) and Albon (Drôme), and is currently under way on the other two structures, at Chanas (Isère) and Saint-Uze (Drôme) respectively. Actierra, our subsidiary, is also involved in this project, drafting the Porter-à-Connaissance (Water Law) documents for these structures crossing watercourses.

The creation of reserved lanes (VROP) on the Ile-de-France national road network was planned as part of the city of Paris’ bid to host the global sporting event in the summer of 2024. The purpose of these lanes was to guarantee a reliable journey time between the various competition sites for accredited vehicles.

They are arranged as left- or right-hand lanes on existing motorways and national roads serving the main sites. Most of these dedicated lanes are temporary, i.e., they are set up during sports competitions. The reserved lanes on the A1 (in both directions of traffic) and the A13 (towards Paris) are known as ‘heritage’ lanes and, since 3 March 2025, have become reserved lanes for carpooling and public transport.

The Ingerop-CDVIA-Citizing consortium is the holder of the singleaward framework agreement aimed, in particular, at building and delivering these lanes within the allotted time. The consortium was entrusted with the complete design and construction supervision.

The current interchange between the RD621 and the RD650 is complex, difficult for users to understand and dangerous. Recorded traffic amounts to 20,000 veh/d on the RD650 and 25,000 veh/d on the RD621, including a high proportion of heavy goods vehicles (20%). The successive changes made over time have resulted in movements that are no longer appropriate, and are causing numerous malfunctions. The redevelopment of this interchange aims to:

• improve the visibility of the junction and user safety,
• streamline the traffic flow between the two departmental roads,
• develop a bike lane and a water retention basin,
• contribute to the economic development of the adjacent business park.

The new interchange, equipped with two roundabouts on the RD650, was built in a complex phased approach, while maintaining road operations at the site. The reclamation of the materials deposited and excavated, the management of rainwater and the planting of new woodland turn this project into a streamlined and sustainable development.

Ingerop, together with a local partner, serves as the project manager responsible for design check and supervising the construction work. The project involves developing and paving a 43.8 km stretch of the Route des Pêches, including access ramps.

This route has strong economic and tourist potential, serving in particular the palaces of Abomey, important regions for voodoo culture and the memorial areas of the former slave trading posts. The works include the construction of asphalt carriageways, six engineering structures (four composite bridges and two reinforced concrete girder bridges) and retaining walls. Interventions also include landscaping and the implementation of environmental and social measures.

Additionally, Ingerop is conducting studies for the implementation of a toll system to secure funding for infrastructure maintenance.

Section 3A of Line 18 of the Grand Paris Express includes a 6.8 km long tunnel, eight ancillary structures and three stations, including Guyancourt. It is a buried structure with internal dimensions of 71.60 m
long, 23.51 m wide and 16.50 m deep. The underground structures are made of reinforced concrete and cast in place.

In infrastructure, it has the following levels:

• a ground floor,
• an intermediate level,
• a platform level,
• an under-platform level.

Access to the future station will be via two outlets opening onto a future avenue that will contribute to the dynamic urban transformation of the area. As part of the project, Guyancourt station was the launch pad for the Awa tunnel boring machine, which is digging the planned 6.8 km tunnel.

HS2 Phase 1 is a new high-speed line covering 225 km from London to Birmingham, UK. The HS2 Phase 1 Lot C1 Contract was awarded to ALIGN JV. This section consists of 21.6 km of high-speed rail line and
includes a viaduct, a twin-bore tunnel, earthworks, two road bridges, a footbridge and a wildlife crossing structure.

The Colne Valley viaduct is an iconic structure, 3.4 km long with approach embankments, stretching from the Northolt tunnel at the southern edge of the Colne Valley Regional Park up to the Chilterns at the northern end. It is set in a diverse and ever-changing landscape, made up of intertwined with forests and crosses major obstacles such as roads and a canal.

The Chilterns tunnel comprises two 16 km-long bored tubes beneath an area of outstanding natural beauty. There are five intervention shafts along the route, four of which are also ventilation shafts. Rendel and Ingerop contributed to the studies in the tender, project and execution phases and assisted the ALIGN JV design-build consortium made up lakes of intertwined during the construction work.

The Geneva International Airport has decided to modernize its facilities with a major enlargement of its “East Wing” to improve passenger comfort.

This project includes a 500 m long metal building of with high environmental quality with two levels and is coupled with a new “processor” building dedicated to the control of incoming and outgoing passengers.

The whole piece consists of an exo metal structure covering a service road and a 20,000 m² public space.

The overall energy mix is balanced thanks to the mobilization of geothermal probes, some equipment with low energy consumption and a photovoltaic power generation of about 1,600 MWh / year.

In this context, the route of the access road to the terminal from France (customs road) will be amended and this road partially buried.

The consortium including Rogers Stirck Harbour et Partners / Atelier J. Bugna / Ingérop Conseil et Ingénierie (in association with consulting engineers from Geneva including T-Ingénierie) were awarded the contract further to an international tender.

As part of the road tunnel Safety measures, in accordance with Circular 2000-63, DIRIF has entrusted INGEROP for design and work supervision for the safety of the Champigny sur Marne cut-and-cover tunnel. This mission follows the definition of the improvement programme and elements of the Safety Dossier in 2003-2004.

CHARACTERISTICS

• Urban tunnel with 2 unidirectional tubes of 750 m and 780 m, with 4 lanes and high traffic, on the A4 motorway
• Works with maintenance of the operation
• Co-activity with 4 other transverse construction management on the site (supervision overhaul, DAI video and physical closures, self-evacuation, radio, etc.)

Civil engineering works:

• Emergency exits and new safety and fire niches creation
• Facilities for disabled people
• N2 or N3 fire protection of structures and networks
• Redevelopment of technical rooms and ventilation plants

Equipment works:

• Resumption of High Voltage (HTA) distribution (new HTA link between substations), refurbishment of technical premises with modification of HTA switchboards and securing of Low Voltage.
• Renovation of the ventilation system (longitudinal system with accelerators in the south and semi-crosswise in the north)
• Complete overhaul of the lighting installations in the 2 tubes and installation of beaconing studs
• Redesign of the fire network

SIRIUS network routing

Complete overhaul of the Centralised Control Management (CTM), interfacing with the general overhaul programme for the supervision of the 22 Ile-de-France tunnels

Design of tunnel built by mining construction method

Carrying out the operation in a cofferdam per half side to maintain river navigation,

Sensitive environmental context (Gulf of Morbihan) requiring special monitoring by the Water Police and the Maritime Works Directorate.