HIGHWAY TUNNELS - CONSTRUCTION - EQUIPMENT - OPERATION - COSTS

THE AUTHORS RECALL THAT THE CONSTRUCTION OF HIGHWAY TUNNELS MUST FOLLOW A DETAILED PRELIMINARY STUDY OF THE NECESSARY TRANSVERSE SECTION AND OF POSSIBLE CONSTRUCTION METHODS, TAKING INTO ACCOUNT THE SITE AND THE GEOTECHNICAL CHARACTERISTICS OF THE TERRAIN THROUGH WHICH THE STRUCTURE IS BUILT. NEW TECHNOLOGICAL DEVELOPMENTS AND IMPROVEMENTS IN THE MECHANIZATION OF DRILLING OPERATIONS HAVE TAKEN PLACE DURING THE LAST 15 YEARS (EXPLOSIVES - DRILLING MACHINES - PRESPLITTING, ETC). A CAREFUL STUDY MUST BE CONDUCTED OF THE EQUIPMENT NECESSARY FOR THE VENTILATION, LIGHTING, TRAFFIC SIGNS AND SIGNALS, COMMUNICATION. EXAMPLES OF CONSTRUCTIONAL AND OPERATIONAL COSTS ARE GIVEN. SEE ALSO IRRD ABSTRACT NO. 103758.