In this closure of the discussion, the authors concur with the discusser that it is an error to show grout extending tight up against the timber lagging. However, in most cases grout did extend above the influence line, and is said to be customary with most tieback installations. A situation where the installation procedure incorporates a method of removing the grout above the influence line may be an exception. The correlation of the failure rate with the soil type in the anchorage zone was unreliable because of the erratic nature of soil stratification at the project site. The authors did find a correlation between the failure rate and the quantity of grout pumped into each anchorage zone for all soil types; this forms the basis of the recommendation that the volume of grout injected in the anchor zone of each tieback should be recorded. The "toggle" on the end of the tendons was intended to prevent them from pulling out as the casing was removed.

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00097377
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11269 Proceeding
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM