A new mucking-out method is being used to improve ventilation and safety during the construction of the US$80M Tagami Tunnel in Japan. The 7km long Tagami Tunnel will form part of the Kyushu Shinkansen high-speed train route between Yatsushiro and West Kagoshima. The main contractor TTC is using a Hitachi Nordberg mobile crusher only 40m from the drill and blast face; a conveyor then transports the crushed rock to the portal, where it is loaded into lorries for further use. The track-mounted crusher has a capacity of 400t/h and is designed specifically for tunnelling applications; it is the latest version of the versatile Lokotrack quarrying machine. The crusher and its conveying system becomes profitable when the tunnel length reaches between 3km and 4km. TTC plans to re-use the crusher after the completion of the Tagami Tunnel. Its use eliminates one stage of the hauling process, and means that tunnel lining works can begin sooner. Work on the invert can also be started sooner; the longer the tunnel, the more likely it is to begin this phase while still tunnelling. TTC is now testing its advanced control multimedia and communication monitoring of the construction works, by using three closed circuit television (CCTV) cameras which can be remotely controlled with rotation and zoom functions.


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  • Accession Number: 00767211
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 6 1999 12:00AM