AVON SHELTERS ROAD FROM ROCKS

Details are given of the concrete and steel structure gallery built to protect the A4 Hotwells Road that flanks the Avon Gorge near Bristol. The gallery, 90 M long, is to be laid to a 265 M radius on plan; it has an in-situ reinforced concrete abutment on the cliff side of the road. This will have counterforts to the cliff face at 7 M centres, each of which will house a vertical array of rock anchors. In situ concrete columns opposite the counterforts will form a colonnade on the other side of the road. Minimum 6.1 M headroom will be afforded by a system of simply-supported longitudinal 900 mm deep steel plate girders supporting similar transverse plate girders at 1.2 M centres. The transverse beams will act compositely with a waterproofed 300 mm thick concrete deck. Crushed limestone aggregate, covering the roof deck to an average depth of 2 M, will serve both to absorb the impact from falling rock and to marry the structure into the surrounding rock scree. The structure has been designed assuming an annual probability of a 9.5 M3 rock mass impact and a once-in-50-years impact from a 1.5 M3 rock mass. For the 0.5 M3 rock size design stresses are within elastic limits. For the larger impact condition, plastic deformation with deflection limited to 3 times the elastic deformation was adopted. The roof is in sections that can be replaced when damaged. (TRRL)

  • Availability:
  • Corporate Authors:

    IPC Building and Contract Journals Limited

    Surrey House, 1 Throwley Way
    Sutton, Surrey SM1 4QQ,   England 
  • Authors:
    • Atkinson, I
  • Publication Date: 1979-10-11

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 38-39
  • Serial:
    • CONTRACT JOURNAL
    • Volume: 291
    • Issue Number: 5223
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00309035
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jun 26 1980 12:00AM