
Tunnelling
Quality fosters greatness.
Implenia is a recognised expert in ambitious underground construction projects of all kinds. Over the course of our hundred-year history we have built up a unique set of skills and experience, especially in road and rail tunnels and power stations. Many of our projects have entered the annals of construction history, including the world's longest rail tunnel, the Gotthard Base Tunnel.
All of our efforts centre on the sustainable efficiency of our customer solutions – in terms of costs, deadlines, quality and functionality. Implenia is committed to the highest quality standards at all times. We combine proven skills and a spirit of innovation with state-of-the-art processes and technologies.
Transport tunnels
Transport tunnels
Successful tunnel construction for rail and road combines experience and competence with modern technology and respect for nature. Implenia has mastered all the modern construction methods of tunnel construction. And all the supplementary special procedures are part of our daily bread. Implenia's comprehensive range of services, which we offer in Switzerland and in selected foreign markets, also includes the demanding final construction of rail and road tunnels using railway and transport technology, as well as the renovation of underground structures.
We set international standards. Our latest coup: the world's longest railway tunnel through the Gotthard, at 57 kilometres, which will be opened in a few years' time. We are open to all forms of cooperation, whether as general contractor, total contractor or specialized subcontractor.
Implenia has mastered all excavation procedures and construction methods:
- rock drilling and blasting
- Driving with tunnel boring machines in the rock: full cut tunnel boring machine, tunnel boring extension machine
- Schildmaschinenvortrieb im Lockergestein: mit/ohne mechanische Stützung, mit Druckluftstüt-zung (Druckluftschild), mit Erddruckstützung (Erddruckschild), mit Flüssigkeitsstützung (Hydroschild)
- Machine-assisted tunnelling in rock and loose rock: roadheader, excavation with mining hammer/excavator bucket, ripper or cutting head
- Special procedures and auxiliary building measures: pipe umbrella, spit umbrella, jetting umbrella, injection, freezing method, chest anchor
- Preventer protected advance explorations
- Segment production
We construct vertical and inclined shafts using the sinking method, the raise drilling method or as shaft excavation. We also provide numerous additional services such as materials management and logistics concepts, surveying, project and construction management as well as consulting and feasibility studies.
Servicetunnels
Servicetunnels
Supply and disposal pipelines are central lifelines of populated areas. The constant growth of urban centres and agglomerations calls for new construction methods so that people and traffic are not disturbed as much as possible. Implenia offers innovative, sophisticated complete solutions in trenchless construction.
Using microtunnelling, pipe jacking and horizontal drilling, Implenia is able to construct service tunnels and pipelines that only require a start and finish shaft above ground. We also offer the construction of these shafts. This saves interfaces and your job is completed faster and more flexibly. Implenia can draw on its own complete range of equipment for all procedures.
Our service package for trenchless construction is rounded off by consulting and feasibility studies.
Power plant construction
Power plant construction
Implenia offers a comprehensive range of services in power plant construction. Our engineers and specialists are entrusted with the construction of tunnels and inclined shafts in challenging lengths and inclinations, whether in mechanized tunnelling, where we have unique experience and a comprehensive inventory of our own, or in conventional blasting. We construct vertical and inclined shafts using the sinking method, the raise drilling method or as shaft drifts. Finally, we also build caverns of all dimensions.
Construction sites for power plants are often located in mountainous areas that are difficult to access, where our engineers and specialists are confronted with special topographical and climatic requirements. Thanks to their broad experience and flexibility, they are able to master even the most difficult challenges and hand over the finished project to the client on time and in the accustomed Implenia quality.
Implenia has mastered all excavation techniques:
- rock drilling and blasting
- Driving with tunnel boring machines: full cut tunnel boring machine, tunnel boring machine
- Machine-assisted tunnelling: roadheader, excavation with hammer/excavator bucket, ripper or cutting head
- Special procedures and auxiliary building measures: pipe umbrella, spit umbrella, jetting umbrella, injection, freezing method, chest anchor
- Preventer protected advance explorations
Added to this are numerous additional services such as materials management and logistics concepts, surveying, project and construction management as well as consulting and feasibility studies.
Our References

SMS 2A - New double track railway Sandbukta-Moss-Såstad
Såstad, Dilling, Moss, Norway
Start of construction: June 2019
Construction volume (value of our services): 728 M CHF
The new double track railway Sandbukta-Moss-Såstad (SMS) is part of the Intercity development and is one of the sections of the line towards Halden (the Østfold railway's western line).

Subway line 17.1 - Paris Grand Paris Express
Paris, France
Start of construction: December 2018
Construction volume (value of our services): 441 M EUR
With a length of 27 km, line 17 extends over 13 municipalities in the departments of Seine-Saint-Denis, Val-d'Oise and Seine-et-Marne. It connects nine stations between Saint-Denis Pleyel and Le Mesnil-Amelot in less than twenty-five minutes and will facilitate the daily life of nearly 565,000 people.

Varberg Tunneln FAS 2
Vårberg, Sweden
Start of construction: December 2018
Construction volume (value of our services): 328 M EUR
The project comprises the two-lane extension of the Varberg-Hamra section, which is part of the Västkustbanan railway line connecting Göteborg with the southern Swedish city of Lund. As part of an Early Contractor Involvement contract (ECI con-tract), Implenia was initially awarded with the Preliminary Design (Phase 1) in June 2018, and subsequently with the Detailed Design and Construction (Phase 2) in September 2019.

Munich Marienhof station
München, Germany
Start of construction: December 2018
Construction volume (value of our services): 394,7 M EUR
The major project 2nd S-Bahn main line Munich consists of the sub-projects "above-ground areas", "inner city area/tunnel" and "supplementary network measures" in the outer branches.

Citylink Anneberg-Skanstull Tunnel
Stockholm, Sweden
Start of construction: December 2018
Construction volume (value of our services): 90 M EUR
As the second of four phases of the so-called City Link Project, the Anneberg-Skanstull Tunnel serves to improve the power supply in the Greater Stockholm area. At a length of around 14 km and a diameter of 5 m, the tunnel is being driven about 50 - 100 m below the Swedish capital using a tunnel boring machine.

Extension of Metro B – Hopitaux Lyon Sud – GC01
LYON, France
Start of construction: December 2017
Construction volume (value of our services): 138 M EUR
In order to serve the city center of Oullins, the university-hospital hub of Lyon Sud, to create a multimodal exchange center and globally to intensify the development of the "valley of hospitals", SYTRAL has decided to extend the line B subway about 2.5 km at the south of Lyon. Two new stations will be created, Oullins Center and Saint-Genis-Laval Hospitals South. This work was entrusted to the joint venture IMPLENIA France (Agent) - DEMATHIEU BARD - IMPLENIA Switzerland. This award marks the successful development of Implenia France in the country by engaging in large-scale projects, with major public clients located in the region.

USINE DE VOUSSOIRS – LIMOGES FOURCHES
Limoges-Fourches, France
Start of construction: November 2017
Construction volume (value of our services): 105 M EUR
Implenia France, within the ALLIANCE group, has developed a specific production tool for segments (tunnel lining) for the needs of Grand Paris.

Extension of Métro Ligne 15 South, Lot T2C, Paris
Paris, France
Start of construction: December 2016
Construction volume (value of our services): 365 M EUR
The “Grand Paris Express” project aims to improve links between the French capital and neighboring residential areas in the Greater Paris region (Île-de-France) by building a transport network of six driverless underground railway lines by 2030. The project will require 210 kilometers of tunnel and nearly 70 new underground stations. After winning the “Lot GC01” Implenia also got the order to build the extension of the Metro line 15 in the south-east of Paris (“Lot T2C”) in a consortium.

Extension of Métro Ligne 11, Lot GC01, Rosny-sous-Bois, Paris
Paris, France
Start of construction: December 2015
Construction volume (value of our services): 267 M EUR
The “Grand Paris Express” project aims to improve links between the French capital and the neighboring residential areas in the Greater Paris region (Île-de-France) by building a transport network of six driverless underground railway lines by 2030. The project will require 210 km of tunnel and nearly 70 new underground stations. It also comprises the extension of the existing line 11 from the station “Mairie des Lilas” in direction to “Rosny Bois-Perrier” in the east of Paris realized in three phases (GC01, GC02 and the viaduct).

Albvorlandtunnel
Wendlingen am Neckar, Germany
Start of construction: January 2016
Construction volume (value of our services): 675 M EUR
The new railway link (NBS) Wendlingen-Ulm together with Stuttgart 21 significantly improves the infrastructure of Baden-Württemberg and thus creates shortened travel and transport times not only in Baden-Württemberg but also across Germany and Europe.

SGP – Ligne 15 sud, Lot T2C
Noisy-Champs, France
Start of construction: December 2015
Construction volume (value of our services): 365 M EUR
The Grand Paris Express project aims to better connect the French capital and neighbouring residential areas in the Paris region by building a six-line driverless metro system by 2030. The project will require 210 kilometres of tunnels and almost 70 new metro stations. After winning "Lot GC01", Implenia was also awarded the contract for the extension of metro line 15 to the south-east of Paris ("Lot T2C") as part of a consortium.

SBB Bözberg tunnel
Strihen, Switzerland
Start of construction: May 2015
Construction volume (value of our services): 145 M CHF
The existing Bözberg tunnel between Frick and Brugg does not meet the new requirements for the clearance gauge (corner height 4.0 m) and will therefore be replaced by a new 4-metre corridor as part of the overall project.

E4 Förbifart, Johannelund tunnel
Vällingby, Sweden
Start of construction: December 2014
Construction volume (value of our services): 254 M EUR
The bypass “Förbifart” Stockholm is a link between the north and south of the capital of Sweden and intends to relieve the traffic through the city. The 21 km long bypass motorway, of which approximately 17 km are underground in a depth of up to 70 m, is divided into six lots. With the 3.6 km long Johannelund tunnel (Lot FSE 403), Implenia won the contract for one of the first lots.
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Metro Subway Nuremberg U3, BA 2.1
Nuremberg, Germany
Start of construction: July 2014
Construction volume (value of our services): 43 M EUR
In order to enhance North Nuremberg’s accessibility to the local public transportation system, the existing subway network will be expanded with the construction of the new U3 line. One section of this new line, south-west section 2.1, extends from “Gustav-Adolf-Straße” station to the border of section 2.2 in direction to “Kleinreuth” station.

Semmering Base Tunnel SBT Lot 2.1
Steiermark, Austria
Start of construction: December 2013
Construction volume (value of our services): 623 M EUR
The planned Semmering Base Tunnel (SBT) is currently one of the most important large-scale infrastructure projects in the heart of Europe, and forms part of the new Austrian southern railway, a central axis on the trans-European route from the Baltic to the Adriatic. With an overall length of 27.3 km, the SBT links Lower Austria with Steiermark. Österreichische Bundesbahn [Austrian Railways] has appointed Implenia as part of a consortium with Swietelsky for the construction of central Lot 2.1, a section about 13 km in length.