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

Language

• English

Media Info

• Features: Figures; Photos;
• Pagination: p. 12-13
• Serial:
  • Highways and Road Construction International
  • Volume: 44
  • Issue Number: 1796
  • Publisher: Embankment Press

Subject/Index Terms

• TRT Terms: Abutments; Beltways; Bridges; Bypasses; Diaphragm walls; Embankments; Precast concrete; Reinforced concrete; Retaining walls; Skew bridges; Slurry trenches
• Geographic Terms: United Kingdom
• ITRD Terms: 3455: Bridge; 2709: Bypass (loop road); 2801: Embankment; 4792: Precast concrete; 4794: Reinforced concrete; 3359: Retaining wall; 3448: Skew bridge; 3358: Slurry trench wall; 8119: United Kingdom
• Subject Areas: Bridges and other structures; Construction; Highways; I53: Construction of Bridges and Retaining Walls;

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