Troy, MI
GeoSpray® Mortar System: Twin Arched CMP Culvert Repair

Project Overview

The city of Troy, MI, is located among Metropolitan Detroit’s northern suburbs in Oakland County. It currently maintains a network of over 350 miles of local, major and county roads under the jurisdiction of its Public Works department. The city has a regular inspection program for its storm culverts and bridges. During recent inspections in 2013 and 2015, severe corrosion of the inverts of twin arched CMP culverts, built in 1967 under Wattles Road and extended in 1983, was observed. The city began to investigate solutions to ensure that the culverts remained structurally sound. The 127-mile Rouge River runs through the culverts on its path to the Detroit River and can flow full in times of heavy rains and snow melts. The twin culverts were designed as CMP steel arch pipes with a nominal size of 12' 10" in wide by 8' 4" in tall. The combined length of the two pipes was approximately 170 linear feet.

When the city began to explore its options for the structure, it originally planned to replace the twin culverts with a span bridge because most conventional rehabilitation solutions such as CIPP or slip-lining typically are not feasible or cost-effective.

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