ELEGANT CORNISH VIADUCTS

This paper describes the construction of two prestressed concrete viaducts carrying the Camborne and Scorrier by-pass over the valleys of Blowinghouse and Gilberts Combe in Cornwall. Blowinghouse viaduct is 183M long and 39M high and Giblerts Combe viaduct is 176m long and 22M high. Each of the carriageways in the viaducts is carried on a hollow 3-cell concrete box girder of trapezoidal cross section, prestressed longitudinally to give continuity over the piers. Each box is 2.2M deep and has a top flauge width of 12M. Each carriageway is constructed as an independent bridge supported on four piers 1M thick. The viaducts are in an area of former metalliferous mining, and the location of some workings is not completely known; areas most likely to be liable to subsidence were indicated by the consulting engineers, and appropriate measures were taken. A design strength of 45 n/sq.m with a maximum aggregate size of 20mm was selected. The mix specification is given and the concreting sequence and prestressing are described. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00105317
• Corporate Authors:

  Cement and Concrete Association

  52 Grosvenor Gardens
  London SW1W 0AQ,   England 
• Publication Date: 1975-9

Media Info

• Features: Photos;
• Pagination: p. 32-33
• Serial:
  • CONCRETE
  • Volume: 9
  • Issue Number: 9
  • Publisher: THE CONCRETE SOCIETY
  • ISSN: 0010-5317

Subject/Index Terms

• TRT Terms: Admixtures; Aggregates; Box girders; Bridge decks; Bridge piers; Bridges; Crushed rock; Design; Granite; Ground settlement; Mines; Mining; Mix design; Prestressed concrete; Ready mixed concrete; Seal coats; Viaducts; Waterproofing
• ITRD Terms: 4736: Admixture; 3474: Box girder; 3455: Bridge; 3434: Bridge pier; 4173: Crushed stone; 9011: Design (overall design); 4101: Granite; 5117: Mine; 4714: Mix design; 4796: Prestressed concrete; 4770: Ready mixed concrete; 5792: Settlement; 3492: Waterproofing course (bridge)
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Materials; Planning and Forecasting; I24: Design of Bridges and Retaining Walls; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00132313
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jun 23 1976 12:00AM