EVALUATION OF TIEBACK PERFORMANCE. APPENDIX A -- SUMMARY OF TIEBACK OBSERVATIONS. FINAL TECHNICAL REPORT

The economy and effectiveness of tiebacks for support of temporary excavations has led to their increased use for support of permanent excavations. To better understand the characteristics and performance of tiebacks, a field observation program was undertaken. Various characteristics of over 900 tiebacks exhumed from an excavation along I-90 in Mercer Island, Washington, were observed in the field. The geometric spacing of the tiebacks appeared to be quite uniform. Centering of the anchor tendon in the augered hole was generally good, although some instances of significantly off-center anchor tendons were observed. Significant corrosion was not observed on any of the anchor tendons that could be examined in the field. Evidence of grease leakage at the end of the trumpets was observed at a number of tiegack locations. While physical disturbance of the tiebacks during the excavation was undoubtedly responsible for much of the observed leakage, leakage was also observed at a number of tiebacks that appeared to be undisturbed. On the basis of the observations made in the field, no specific changes in the current Washington State Department of Transportation design methods and specifications for tiebacks appear to be necessary. This report contains Appendix A - Summary of Tieback Observations.

• Record URL:
  http://www.wsdot.wa.gov/research/reports/fullreports/269.2.pdf
• 
• Corporate Authors:

  University of Washington, Seattle

  Seattle, WA  United States  98195

  Washington State Department of Transportation

  Transportation Building, 310 Maple Park Avenue SE, P.O. Box 47300
  Olympia, WA  United States  98504-7300

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Kramer, S L
• Publication Date: 1993-1

Language

• English

Media Info

• Features: Appendices;
• Pagination: 56 p.

Subject/Index Terms

• TRT Terms: Corrosion; Corrosion protection; Field studies; Grease; Leakage; Performance evaluations; Retaining walls; Tiebacks
• Old TRIS Terms: Anchor tendons; Field observation
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00628818
• Record Type: Publication
• Report/Paper Numbers: WA-RD 269.2
• Contract Numbers: GC8719, Task 19
• Files: TRIS, USDOT, STATEDOT
• Created Date: Apr 14 1993 12:00AM