LISKEARD BYPASS, UNUSUAL SOLUTION TO RETAINING WALL PROBLEM

The article describes the major features of the recently opened 3 km bypass on the A38 trunk road. The road crosses the railway line on an embankment at two points. A three pinned concrete arch on a 152 M horizontal radius is used at one point, and a single span reinforced concrete slab on propped abutments is used at the second western crossing. The four other bridges are described; one crosses the bypass at a 44 degree angle of skew with a three span continuous prestressed concrete single cell box structure. Because of space restrictions, step construction allowing 3 M deep cuts was used to construct the 12 M high retaining wall adjoining hospital grounds. As each level was excavated from the top downwards, the exposed rock face was supported by 600 mm wide precast reinforced concrete "soldiers" at 3 M centres. Precast panels were fitted in the spaces between the "soldiers". Bad ground conditions on part of the wall required the use of an 800 M thick diaphragm wall with two rows of ground anchors. Dummy "soldiers" and panels were placed in part of the diaphragm wall. /TRRL/

  • Corporate Authors:

    Embankment Press Limited

    Embankment House, 3 Caledonian Road
    London,   England 
  • Publication Date: 1976-4

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00145417
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 27 1977 12:00AM