This article describes the progress of the construction of the passenger subways to the new underground station at Heathrow Airport. These subways are being built with minimum of disturbance to road traffic; the methods used are described: the use of "secant" bored piles to form the walls of the subway and that of a capping beam, on which are placed precast prestressed inverted T-Beams, forming the roof of the subway. Diaphragms wall techniques also were considered but they would have caused severe disruption above the ground. It was necessary to carry out 50 major service diversions and many sewer alterations. Method of installing the secant piles is described. When crossing a road the piling, roofing and reinstatement operations follow closely behind each other. The walls of the subways are being covered by a 100 M M thick layer of gunnite. To construct the subway under terminal one car park a mini-rig was used because of the restricted head room. Chemical stabilization was utilized to help the strata withstand the horizontal pressures developed by the exposed footings. The subway enters terminal one just above the foundation slab which is 4M thick. The main subways will be 8M wide and 2.42M high and will accomodate 1.4M wide moving walkways in both directions. The subways should be in use by the end of 1977. /TRRL/

  • Availability:
  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Authors:
    • Gosney, J
  • Publication Date: 1975-6-19

Media Info

  • Features: Photos;
  • Pagination: p. 40-41
  • Serial:
    • Volume: 265
    • Issue Number: 4998
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00127913
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1981 12:00AM