MINI-TUNNELLER BREAKS THE UNDERGROUND RECORDS

The Atlas Copco mini full facer tunnelling machine completed a 400M long effluent drain tunnel in six weeks as part of the Roundhill sewage treatment works in the west midlands Tunnelling through sandstone, the machine went forward in 8 inch steps at a rate of up to 35.5M per 20 hr day. The tunnel was 1.5M wide and 2.4M high cut by a full width circular head which swivels about a horizontal axis. At the start of each cycle the head is down in its rear most position. As the machine moves forward, it cuts the tunnel floor, leaving it with a slight radius, the vertical tunnel sides, then at the end of its stroke the cutter leaves a semicircular roof. The cycle time can be varied to suit the condition and type of rock in which it is working. Material cut from the front of the machine is taken to the rear where it is discharged into a conveyor system. The machine consists of the cutter head/swing housing assembly, a trailer housing the hydraulic power pack and an operators cabin. Cutting heads are available at 1.4M, 1.5M, and 1.6M diameter.

  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Publication Date: 0

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Filing Info

  • Accession Number: 00138886
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: 3 Phot.
  • Files: ITRD, TRIS
  • Created Date: Jan 16 1977 12:00AM