Is it Round, Square or Oval: Repair of a Culvert with Multiple Cross Sections

Is it Round, Square or Oval: Repair of a Culvert with Multiple Cross Sections


Mo Ehsani, PhD, PE, President QuakeWrap, Inc. and Professor Emeritus of Civil Eng. U. of Arizona, Tucson, AZ
Alex Christensen, PE, Dept. of Public Utilities, Salt Lake City Corporation
Marvin Murphy, FRP Construction, LLC, Tucson, AZ

Abstract: A culvert directs the flow of Red Butte Creek beneath Sunnyside Avenue in Salt Lake City, Utah. This culvert consists of three sections: 1) 48-inch RCP, 2) oval-shaped masonry/concrete, and 3) 4’ x 3’ box culvert. The concrete/masonry section was the oldest and in the worst condition with visible aggregate and a large crack throughout the crown of pipe. The conventional option of open trench excavation and replacing the culvert was deemed too costly and would cause significant impact to the roadway and creek. Therefore, a trenchless technology was decided. The repairs were carried out in winter 2017 and consisted of implementing grout, Carbon Fiber Reinforced Polymer (CFRP) products, and Glass Fiber Reinforced Polymer (GFRP) products. The sections of culvert were initially prepared using grout to create a profile suitable for CFRP/GFRP. CFRP was then installed to strengthen the masonry/concrete culvert since it was in the worst condition, while the 48-inch RCP and box culvert was rehabilitated with GFRP since these sections of pipe were in satisfactory condition. The construction proved to be very challenging with an unusually warm winter season in February. This required intensive bypass pumping and evacuation of the workspace in order to allow high flows to run through the culvert. Nevertheless, the project was successfully completed at the end of February 2017 with a repair that minimized the loss of flow capacity through the culverts and was also unobtrusive to the environment and public.

Publication Date: 2018

Presented at:
NASTT’s 2018 No-Dig Show Palm Springs, California
March 25-29, 2018 | Paper Number: MM-T3-05

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