This type of tunnels are realised by digging, on site casting of guide curbs, placing of side vertical structures and of any central ones in the event of double-barrel tunnels, placing of upper vault girders, waterproofing and subsequent embanking. This is a system composed of three types of precast elements assembled on site for creating a closed concrete precast mould above which the topsoil will be arranged. One of the most interesting aspects of using this system, in addition to the uncontested processing speed, is the possibility of minimising the environmental impact and overcoming any problem related to the traffic.
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