Design and Rehabilitation of a 48”, 90 Year old brick sewer at depths of up to 70 feet CIPP (to protect it from a 20 foot tunnel being constructed right under it)

摘要

The Fairfield Sewer is located under Eglinton Avenue East between Bayview and Walder Avenue in the Greater Toronto Area (GTA), ON, Canada. The sewer is a 1200 mm (48”), two and three-ring, brick sewer originally constructed in about 1926 by tunneling methods. While the brick sewer was in relatively good condition, the Eglinton-Scarborough Crosstown (ESC) Twin Tunnels Project was constructing a 6 m (20 foot) diameter tunnel that was directly under the brick sewer and within 2 m (6 feet) of it at one location. There was serious concern that a relatively minor loss of ground from the tunnel boring machine operations could result in catastrophic collapse of the brick sewer. A decision was made to reline the sewer as a preventative measure to preclude catastrophic collapse and keep remedial work, if required, to relatively minor repairs of the liner.