Method and apparatus for producing a coating on concrete during excavation of underground cavities, such as tunnels, galleries or other cavities by digging a shield driving method

THIS METHOD IS TO INTRODUCE PROJECTION OF CONCRETE IN A ROOM SHUTTERING 7 formed between FORMWORK 4 MOBILE AND WALL GROSS DIGGING 8, BY THE END BEFORE OPEN THIS ROOM. THIS IS CARRIED OUT IN PROJECTION DIRECTION APPROXIMATELY AXIALE USING DUCT 11 FOR THE SUPPLY OF CONCRETE INJECTION. THESE PIPES MAY BE SWING AND (OR) RELOCATABLE ON THE PERIPHERY OF ALL. INJECTION IS CARRIED OUT IN THE SAME AREA THE TAIL 9 SHIELD DIGGING 2.