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Innovative
TECHNIQUES

With innovative techniques and international experience, AGJV will construct the main part of the tunnel at the Follo Line Project. Four Tunnel Boring Machines will be central to this part of the project.




INSTALLATION OF
SEGMENTS

As the cutter head excavates the rock in front of the machine, the rear section of the TBM installs the concrete segments creating the reinforced tunnel wall.

The tunnel at the Follo Line will be lined with pre-cast concrete segments which are combined and bolted into place to complete a ring.



CONCRETE SEGMENT
FACTORY 

AGJV has built a large concrete segment factory at the construction site to supply the TBMs continuously. The entire factory area is about 20 000 m2 and has three production lines, batching plants and other auxiliary installations.

Seven concrete segments is needed in order to assemble one complete tunnel ring. In total almost 20 000 complete rings, or 140 000 concrete segments, is required to make the 18,5 km twin tunnel.



THE FOUR FOLLO LINE
TUNNEL BORING MACHINES

Four tunnel boring machines (TBMs) will be used in the excavation of the main part of the tunnel at the Follo Line Project.

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assembly play

 

WATCH THE 
TBM ASSEMBLY

The Follo Line Tunnel Boring Machines are assembled inside a large mountain chamber, and this short video captures this remarkable process.



EXTENSIVE 
INTERNATIONAL EXPERIENCE

The Spanish company Acciona and Italian Ghella have joined forces and established AGJV. Both companies have extensive international experience in large infrastructure projects, such as tunnels and railroad. Read more about the companies by clicking the logos below.


acciona      ghella