A TRIUMPH OF INTELLECT OVER ADVERSITY

This article describes the progress of tunnel construction on the Heathrow Express Rail Link to Heathrow Airport, London, after the disastrous collapse on 21 October 1994. On that date, a land settlement occurred at the construction site in the vicinity of the station in the central terminal area (CTA). A Solutions Team was formed, to investigate the viable options for restarting work on the affected sections and completing the rail link, and spent nine months developing a recovery plan, implemented in September 1995. Work continued on most of the remaining sections of the tunnels, with little delay as a result of the collapse. At the end of the cut-and-cover twin tunnels, tunnelling work began on the Running Tunnel North (RTN) drives. A 21m by 11m oval shaft was sunk in the clay, to allow the construction of four launch eyes for tunnels. Work on the Running Tunnel South was completed in April 1995. In September 1995, work was resumed at Terminal 4 on completing the secondary linings of some tunnels and on excavating two platform tunnels, using a modified Sprayed Concrete Lining (SCL) technique. Work began on the CTA solution, to sink several new access shafts to allow tunnelling to resume, and construct and excavate a coffer dam round the collapse site.

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  • Corporate Authors:

    THE MINING JOURNAL LTD

    60 WORSHIP STREET
    LONDON,   United Kingdom  EC2A 2HD
  • Authors:
    • CLARKE, I
  • Publication Date: 1996-5

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00726601
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Oct 28 1996 12:00AM