Recently, when the Baton Rouge, Louisiana, City/Parish Public Works Department needed to install a new, 10-in. diameter sanitary sewer relief pipeline to serve a rapidly growing area, the Request for Bids did not specify an installation method, but all the submitted bids were for cut-and-cover. “We were the low bidder,” said Bill Selig, president of Magnolia C o n s t r u c t i o n C o m p a n y “but I sure didn’t want to dig up that neighborhood to install the pipe.”
The 850-foot-long pipeline was to be installed 15 feet deep in an upscale residential neighborhood. A cut-and-cover installation would require cutting across two streets, destroying the sidewalk, many concrete driveways and streetlights, disrupting other utilities and established landscaping, and restricting homeowners’ access. It would also create a muddy mess in the middle of winter. Selig had heard about the patented ArrowBore installation process gives contractors and pipeline owners the constant assurances they need, to know they are within specifications. This is done through a series of unique developments and modifications to standard installation techniques. The process was developed by Ted Dimitroff and is owned and licensed worldwide by A d v a n t i c a T e c h n o l o g i e s. The most obvious difference between ArrowBore and a standard HDD installation is the use of sight/relief holes. These are a series of precisely aligned, vertical holes (usually 16-inches in diameter) drilled along the path of the new pipeline. The holes are about two feet deeper than the planned depth of the new pipeline and are usually lined with a polyethylene (PE) pipe.
Jerry Montgomery, president of J. Montgomery Sales in Baton Rouge explained that he recommended a very rigid PVC pipe manufactured by CertainTeed Corporation. The Certa-Lok™ C900 Restrained Joint piping system is relatively thin walled, yet strong enough to be pushed or pulled through the bore hole. The pipe’s stiffness prevents sagging or bowing after the pipe is in place. Public Works, April 2003.
Trenchless Construction
Pipe sizes used: 4", 6", 8"
