Advanced Engineering 2019

Insituform Awarded Rehabilitation Contract by City of Chicago

11 November 2002

The City of Chicago has awarded Insituform a $2.8 million contract for sewer rehabilitation.

Insituform bid on this project on April 26, 2002, was officially awarded the contract on August 22, and began work on September 9. The project, which involves the rehabilitation of approximately 1,440 feet of large diameter, semi-elliptic sewer pipe, utilizes Insituform SP (structural panels), a new Insituform process.

This is the first project featuring Insituform SP, glass reinforced panels (GRP) that are specifically designed for gravity sewers or drains with large diameters or those with varying shapes. The factory-manufactured panels of a reinforced composite plastic material are lowered into the sewer through shafts or manholes and fitted together inside the sewer to form a 360-degree segment, taking the shape of the original host sewer. The annular space between the structural panels and the host sewer is then filled with grout, forming an interference bond with the composite material. The Insituform SP process, which can negotiate bends, is ideal for sewers that change in shape or size and is the most cost effective way of structurally rehabilitating and providing a 50-year life for a sewer of this size. Since this is a trenchless procedure, the costs are dramatically less than digging and replacing the sewer lines.

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