Progress on the construction of the privately funded cable-stayed bridge, M25 motorway crossing of the river Thames, is described. Speed of construction was the main reason for maximum prefabrication being used to build the four 137m high steel pylon structures that will carry the main span on two arrays of 14 pairs of stays. Each was made in three sections by a subcontractor in Rotterdam for economic reasons and ease of transport by sea. Assembly of the 450m main span should be completed by the end of 1990. A pair of specially designed 60 tonne derrick cranes will complete all lifts as the main span is built out 15m at a time from each pier. Kingpost of each derrick is supported on a special beam spanning between the deck edgebeams to avoid local distortion of the deck structure. Special pendel link bearings carry the side spans at six of the trestles to cope with large vertical forces resulting from the unusual combination of a very long main span with three short backspans leading to the approach viaducts. Tackle and pulleys on the pylon tops will be used to winch the cable stays into position as each section is added. The stays have been designed for easy replacement. (TRRL)

  • Availability:
  • Corporate Authors:

    Thomas Telford Limited

    London,   United Kingdom 
  • Authors:
    • WINNEY, M
  • Publication Date: 1990-7-5


  • English

Media Info

  • Pagination: p. 32-33
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00617435
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 30 1991 12:00AM