Large Diameter Rehabilitation in Houston

A custom made pipe carrier and pusher was designed to install the 120-inch CCFRPM pipe.

Short segments of CCFRPM pipe were manufactured by Hobas Pipe USA to facilitate assembly into the existing curved host.

The existing tunnel was about 132-inches in diameter and the 120-inch CCFRPM pipe has an outside diameter of 126-inches. This allowed a clearance of only three inches which due to the high strength thin walled Hobas pipe, maximized the I.D. post rehab.

The Northside Sewer Relief Tunnel reached depths of 50 to 60 feet below grade.

The pipe sections were carried into place and assembled inside the tunnel, much like a two-pass operation with the host pipe serving as the primary tunnel. The condition of the existing sewer made this the best installation method.

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