PLACING CONCRETE IN TUNNELS

The article discusses the factors which determine the method of transportation and placement of concrete in tunnels. Such factors to be considered include section length, type of tunnel excavation method (i.e. Blasting or machine driven) and whether a dry or wet mix is required. In small section tunnels of up to 12 sq M in section, where it is impossible to mix concrete inside the tunnel section, special transit rail wagons (concrete remixers) are used. The same equipment and methods can be used in medium tunnels of up to 25 sq M section. In large tunnels of up to 100 sq M section a concrete mixer can be installed inside the tunnel. The mixer can then be filled by silo rail wagons fitted with a conveyor running the length of the train for discharge straight into the mixer. A development in concrete placing equipment is the lorry-mounted concrete placing boom manufactured by Schwing. Suitable for all tunnels of various diameters the equipment can be unfolded in a limited space and withdrawn horizontally from the shutter. Using this equipment concrete can be placed from inside the shuttering, through ports or from outside. /TRRL/

  • Availability:
  • Corporate Authors:

    Morgan-Grampian (Professional Press) Limited

    Morgan-Grampian House, Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Muehlhaeuser, H P
  • Publication Date: 1977-11

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00183316
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 14 1978 12:00AM