The article describes the design and construction of the interchange connecting the M90 from Edinburgh to the Perth ring road with a free flow layout. To protect a 125 year old railway tunnel blasting operations were monitored by transducers mounted on the tunnel lining. Details are given of the seven bridges forming the interchange. Pre-splitting was used to excavate the rock to minimize the disturbance of the rock joints behind the final face. A buried reinforced concrete span has been provided behind the abutment of the river earn crossing. Constructional difficulties due to site conditions are described. Details are given of the design and construction of the Friarton bridge carrying the M85 on a partially curved alignment over the river Tay. The bridge is of twin box girder sections with 200 mm thick 30 n/sq mm lightweight concrete deck slabs with an air density of 1680 kg/cu M, using lytag fine and coarse aggregates. /TRRL/

  • Corporate Authors:

    Embankment Press Limited

    Building 59, GEC Estate, East Lane
    Wembley, Middlesex HA9 7TQ,   England 
  • Publication Date: 1977-1-2


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00157372
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Oct 13 1977 12:00AM