DRAWBRIDGE DESIGN BEATS LOCH LEVEN SNAGS

This article gives an account of the construction of the Balla Chulish bridge on the shores of Loch Leven, Scotland. The method of construction used is likened to the operation of a drawbridge. After a general introduction in which the author refers to the lost time due to high rainfall and the advantages the bridge will bring, the article continues with an account of the choice of the design used. The author then gives an outline of the design, a through truss bridge with a main span of 183 M and side spans of 29 M and 82 M, which will cost found2 million. This is followed by an account of the construction of the abutments and the erection of the spans, which involved the use of special props that allowed an infinite range of height adjustment. Because the mobile crane available was inadequate to lift the steel sections out over the loch an alternative method, described in the article, was used. This involved the use of hinges at one end of each section, fixing the section parallel to the shore and pushing it through 90 degrees with the jib of the crane. This resembled the "drawbridge" method that was used to erect the structural steelwork in the main span, which is also described this involved the use of a 30-ton telescopic crane on bogies and the winching of the sections on another bogie. The article concludes with an outline of the way in which the bridge will be completed, and the measures to be taken to eliminate the sag in the mid-span area. /TRRL/

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  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Publication Date: 1975-3-27

Language

  • English

Media Info

  • Features: Photos;
  • Pagination: p. 28-29
  • Serial:
    • CONTRACT JOURNAL
    • Volume: 264
    • Issue Number: 4986
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00129674
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM