Vast sums are spent for the upkeep of the nation's public facilities. Containing maintenance costs, which increase as infrastructure ages, is driving the development and use of new technologies. For underground utilities, trenchless technologies provide practical alternatives to open-cut techniques for replacing or repairing existing lines. However, data on costs and performance of these new technologies are limited, and data is essential for effective infrastructure-management decisions. This paper provides an initial cost and performance evaluation of three new sewer spot-repair methods and explains how the approach to their evaluation applies to other maintenance technologies. The three spot-repair procedures evaluated were significantly less expensive than conventional open-cut repairs. In addition, the spot-repair techniques reduce indirect and social costs, such as materials disposal and traffic delays, respectively. Total life-cycle costs, however, are sensitive to the useful life of the repair for which very limited data are available. Test results reported here reveal that material properties and repair performance differ significantly between the repair methods. Further study is recommended.


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  • Accession Number: 00714680
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 28 1995 12:00AM