To assure geometry of the works, to provide watertightness, to assure security of the worksite. Sofrasar products are used:
To handle
To assemble
To inject
A range of bolts and sockets which takes from 60 to 400 kN of stress distribution on circumferential connection.
The linking of rings with drifting system, without bolting, but with thermoplastics, so that the tunnel can “live” with an individual mobility of each ring.
