Newbridge bypass forms a major link in the A483 North-South chain which skirts the boundary dividing Wales and England. The scheme features one of the most technically challenging high-level viaducts to be constructed in the United Kingdom using the balanced cantilever method. Construction is compounded by poor access and sheer height above the valley floor. The design features 3.5 m segments, prestressing ducts that weave in and out of the top and bottom flanges as well as the segment webs, and 400 mm thick web sections. The slender section of the webs and flanges, and the density of reinforcement and prestressing steel which they are required to host, has meant that particular attention has had to be placed on concrete mix design in order to ensure proper compaction. To this end the contractor is using two basic structural mixes, designed as a compromise between pumpability and flow, and strength. Further details of the construction are provided in this article.

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  • Corporate Authors:

    Faversham House Group

    Faversham House, 111 St James Road
    Croydon, Surrey CR9 2TH,   England 
  • Authors:
    • Webb, C
  • Publication Date: 1989-9

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Filing Info

  • Accession Number: 00488543
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 31 1989 12:00AM