The article describes the construction of the 1.5 km long A9 Cromarty Firth Bridge. Production line methods are being used to meet a 10 day cycle of two-span deck beam emplacement. A total of 67 piers have to be established at 21.5 centres in the Firth. Each pier is composed of two in-situ concrete columns 5.34 M apart, founded on precast Herkules piles. A Dutch flexifloat four-leg jack-up barge is being used to provide a stable base from which to drive the vertical and raking piles to a depth of 65 M at all states of the tide. The technique used for casting of the columns and column bases is described. Prestressed concrete deck beams are installed from a double-double Bailey gantry launched over the water to span two piers at a time. Laminated rubber bearings are fitted at every third pier, intermediate piers have floating piston bearings and stainless steel dowels to absorb expansion forces. /TRRL/

Media Info

  • Features: Photos;
  • Pagination: p. 24-25
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00178588
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 27 1978 12:00AM