BREAKTHROUGH UNDER THE TYNE

This article gives a brief account of the construction of the 2.2 million Tyne siphon tunnel which is part of a 60 million scheme to clean up the Tyne. The tunnel was driven from both ends because of the complicated and confused geological conditions and because of the fissured state of the strata following coal mining activities. Blasting techniques were used in the largely unfissured sandstone at the south bank, whilst a conventional shield working in compressed air was used at the north drive. A strict regime of advance probing was carried out so that no large water-bearing fissures would be unexpectedly encountered and the tunnel was lined with a conventional cast iron segmental lining, an air pressure of 0.17n/m2 being employed in the north section to reduce the ingress of water. In order to balance air pressures before breakthrough a steel bulkhead was constructed in the south drive and holes were bored through from the north drive into the pocket between bulkhead and face. /TRRL/

  • Availability:
  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Authors:
    • Gosney, J
  • Publication Date: 1975-1-16

Media Info

  • Features: Photos;
  • Pagination: p. 21
  • Serial:
    • CONTRACT JOURNAL
    • Volume: 263
    • Issue Number: 4976
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00125578
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 29 1976 12:00AM