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| Solution for temporary mining water lines  Approximately 9,000 feet of CertainTeed Certa-Lok Yelomine PVC pipe was recently installed in a new subway tunnel for the New York City Metropolitan Transportation Authority's (MTA) No. 7 Line Extension for water and wastewater services. This installation is part of a massive $2.1 billion project to extend the MTA's No. 7 line, which runs from Main Street, Queens to Times Square, Manhattan to support development on the far west side of the city. The MTA hired S3, a consortium of three contractors — J.F. Shea Construction, Skanska Construction and Schiavone Construction — to build 7,000 feet of twin-tube tunnel 125 feet underground between 25th Street and 42nd Street in New York City. J.F. Shea Construction managed the project, which involved a crew of 230 sandhogs, operators, electricians and laborers. When it came time to select a pipe product to provide a temporary coolant/lubrication water line and a wastewater removal line for the project, J.F. Shea Construction chose Certa-Lok Yelomine pipe. They had previously worked with the product and were pleased with its easy installation. "We chose the Certa-Lok Yelomine pipe for this project because it's easy to put together and easy to take apart, when needed," says Bob Leslie, tunnel superintendent for J.F. Shea Construction. "All you need is a hammer and a pair of pliers to pull the spline into the coupling, and you're good to go. Anything that can be done to save time on a project is a good thing, and this product fits that profile." Since the pipes are for temporary use, they are disassembled and cleaned at the end of a project and shipped out for reuse on another J.F. Shea Construction job, Leslie adds. Certa-Lok Yelomine is performance-proven for a broad range of piping applications, including trenchless construction, potable water, sewer, irrigation and mining. Its innovative joining system, which utilizes a high-strength spline with an elastomeric O-ring inside to connect pipe lengths, reliably holds the pipe together when installed and pressurized. Certa-Lok Yelomine offers leak resistance, quick assembly without the need for time-consuming and expensive joint fusion, and high impact resistance, performance attributes that truly stand out among the competition. "Yelomine has made a name for itself over the years with its groundbreaking restrained-joint PVC pipe system and strong performance," says Steve Gross, director of research & development and technical services for CertainTeed's pipe business. "The pipe is easily assembled, without the need for time-consuming and expensive joint fusion, helping crews to meet tight deadlines on important municipal projects, such as the MTA's Line 7 extension." The crew began work in June 2008, making excavations and creating the first 1,000 feet of the tunnel, using the drill-and-blast method. After this, the crew placed two Herrenknecht tunnel boring machines to bore through the remaining 6,000 feet of the line extension. As each machine bored, it installed precast concrete liner segments to fabricate the interior of the tunnel. The crew installed approximately 9,000 feet of Certa-Lok Yelomine pipe — in both 4-inch and 6-inch diameters — over the concrete liner segments, securing them with metal brackets. The new tunnels will be operational in December 2013, following work on subway station entrances and finishes, as well as support facilities, such as ventilation and traction power substations. write your comments about the article :: © 2011 Construction News :: home page |