REHABILITATION OF NON-CIRCULAR WASTEWATER CONVEYANCE PIPE TUNNELS USING ADVANCED GLASSFIBRE REINFORCED POLYMER MORTAR PIPE

摘要

Faced with rapid deterioration of the past century hand-mined, cast-in-place, and clay-tile-lined concrete sewer lines, both the City of Los Angeles and the Los Angeles County Sanitation Districts have evaluated multiple methods and materials to rehabilitate their semi-elliptical systems. The evaluation was focused on identifying a cost-effective solution that offers a permanent structural solution. The methods that were considered by these agencies included:1) Dry-flow cast-in-place PVC liner2) Dry-flow Cured-In-Place Pipe (CIPP), and3) Live-flow sliplining method using Glass Reinforced Polymer (GRP) panelsThis paper offers highlights of the ASTM, ISO and WRc standards governing the design and fabrication of the structural GRP liners, all of which would be beneficial to the design and specifications engineers.The paper will also provide the following which will be beneficial to all public agency engineers, consultants and construction managers:1. The factory and field quality control details.2. An overview of several non-circular GRP pipe rehabilitation projects in Southern California area that have already been completed and/or are under construction.3. A discussion of accepted and approved methods and materials as well as project costs.4. Lessons-learned from the rehabilitation projects.