Glass Reinforced Plastic (GRP): A New Rehabilitation Technique for Sewers in Indiana

The City of Fort Wayne, Indiana, periodically experiences problems with its older combined sewers. A failure in any of these sewers is problematic, but a failure in some of these lines, such as the Taylor Street Combined Sewer, would be catastrophic. Located beneath a busy multi-lane road near downtown Fort Wayne, the 1,830 mm (72 in.) brick Taylor Street sewer is vitally important during high flows caused by rainfall events. Not only would a collapse create enormous environmental repercussions, it could also result in loss of life. Because the line includes a 90-deg bend beneath the road, a collapse would, at minimum, require expensive and disruptive street and sewer repairs. The City of Fort Wayne retained Greeley and Hansen to assess the Taylor Street sewer from a structural and hydraulic basis, and to provide a technical memorandum for its rehabilitation or replacement. The firm's assessment found poor structural integrity in critical sections of the 100-year-old sewer due to settlement, corrosion and natural deterioration. To repair or replace the sewer using conventional methods would be expensive, disruptive and require closing the street. Instead, the consultant recommended the City rehabilitate critical sections of the sewer using glass reinforced plastic (GRP) panels. After contract documents, including contractor qualification requirements, were prepared, the project was awarded to the low bidder, Affholder, Inc. This paper provides the rationale for the project and its benefits to the Fort Wayne community. It includes a discussion of the study area and the operating characteristics of the Taylor Street Combined Sewer. It describes how the City selected GRP panels over the other alternatives considered. The paper also discusses the problem-solving approach the team used prior to construction, GRP panel design, installation techniques and challenges.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos;
  • Pagination: 10p
  • Monograph Title: Pipeline Engineering and Construction: What's on the Horizon? Proceedings of the Pipelines 2004 International Conference, August 1-4, 2004, San Diego, California

Subject/Index Terms

Filing Info

  • Accession Number: 01003253
  • Record Type: Publication
  • ISBN: 0784407452
  • Files: TRIS
  • Created Date: Aug 19 2005 11:38AM