After installing the hydraulic jacks, the cradle and the RTBM in the launching shaft, the workers put inside the prefabricated tunnel segments one by one. The boring machine and the hydraulic jacks then push the whole series of segments forward gradually until reaching the receiving shaft at the other end of the tunnel.

After installing the hydraulic jacks, the cradle and the RTBM in the launching shaft, the workers put inside the prefabricated tunnel segments one by one. The boring machine and the hydraulic jacks then push the whole series of segments forward gradually until reaching the receiving shaft at the other end of the tunnel.

After installing the hydraulic jacks, the cradle and the RTBM in the launching shaft, the workers put inside the prefabricated tunnel segments one by one. The boring machine and the hydraulic jacks then push the whole series of segments forward gradually until reaching the receiving shaft at the other end of the tunnel.