42-inch Water Line: W. Airport to Braes Forest – City of Houston
The waterline project was approximately 9,250 LF of 42-inch waterline constructed of bar-wrapped steel cylinder pipe with steel pipe within a Harris County Flood Control District (HCFCD) tunnel section. The project limits included both residential and commercial areas. Approximately 2,500 LF of 12-inch waterline was installed within the residential area to replace an aging 12-inch asbestos cement line. Special provisions were made to protect large mature trees. A 60-inch diameter, 220-foot-long, 40-foot-deep tunnel was installed across the Harris County Flood Control drainage channel at Ludington Drive.
With the roadway bridge identified as critical structure, a specific instrumentation monitoring plan was required, with survey points established adjacent to the bridge structure and caisson. The design included over-sized, extra-depth manholes to provide maintenance and operational access to the waterline and drain lines. A structural impact analysis was performed during design to identify potential impact to the roadway bridge, and structural monitoring requirements were incorporated into the construction documents. The project also included a 60-inch diameter, 140-foot-long, 15-foot-deep tunnel across Fondren Road.
At a glance
9,250 LF of 42″ water line installed by open-cut and tunneling methods
2,500 LF of 12″ water line to replace existing asbestos-cement line along residential street
Construction cost approximately $6.4 million
Construction Notice to Proceed in August 2013; final completion issued August 2014
Project limits included both residential and commercial areas
60″ diameter, 220 ft. long, 40 ft. deep tunnel across Harris County Flood Control drainage channel
Roadway bridge identified as critical structure
Specific instrumentation monitoring plan was required with survey points established adjacent to the bridge structure and caisson
60″ diameter, 140 ft. long, 15′ deep tunnel across Fondren Road
Large mature trees throughout project required special provisions
Pipeline Design, Condition Assessment & Rehabilitation
City of Houston