IN SITU CONCRETING IN TUNNELS

This article outlines the various problems, and the methods of answering them which arise during the concreting stage of tunnel construction, using the experience of the Liverpool loop line as a typical example. This line is a new underground railway system which incorporates 3.2km of 5M dia. tunnel. Access for the contractors was limited to five vertical shafts down to the tunnel which ranges in depth from 20 to 35M below ground level. The question of inaccessibility, no concrete lorry could gain access to the tunnel, raised major problems involving delivery of concrete to the tunnel, rapid transit from the access point to the working point and the handling of the concrete at the working point. The use of steel-lined boreholes incorporating pneumatic doors at the base of the downpipes to deliver concrete to the tunnel is described, together with the use of pneumatic-tyred and railway-tracked vehicles in addition to pumping to rapidly transmit the material to the workpoint, and the placing methods employed at the workpoint. In all these operations timing was considered to be of utmost importance, and a high degree of effective supervision necessary /TRRL/

  • Availability:
  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • Owen, G P
  • Publication Date: 0

Media Info

  • Features: Photos;
  • Pagination: p. 14-17
  • Serial:
    • CONCRETE
    • Volume: 9
    • Issue Number: 10
    • Publisher: THE CONCRETE SOCIETY
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 00133634
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 22 1981 12:00AM