10-05-2006, 03:20 PM
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Ta ra ra boom de ay
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Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
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Quote:
Originally Posted by Larry Delor
By trenchless, do you mean something like insituform?
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Found this:
How it Works
Roto-Rooter's trenchless excavation technology uses advanced equipment to enter the ground via two small access pits, approximately three four feet by four feet square. Using the broken sewer line as a guide, Roto-Rooter's hydraulic pipe-bursting machinery pulls full-sized, seamless replacement pipe through the old pipe's path while breaking up the old damaged pipe in the process. Once the job is completed, the entrance and exit pits can be quickly refilled, leaving little or no evidence of activity. The manufacturer claims the new heavy-duty polyethylene pipe has a life expectancy of up to one hundred years. And since the pipe is seamless, it is impervious to leaks or root intrusion. The entire process goes on below ground leaving almost everything on the surface undisturbed. Roto-Rooter can replace pipes of varying sizes using this revolutionary and versatile equipment. Similar to the pipe-bursting technique described above, Roto-Rooter also utilizes a process called "trenchless pipe re-lining." Pipe re-lining can thread a new inner skin into damaged underground pipes, sealing cracks and creating a smooth new inner wall that will last for decades. Like the aforementioned pipe bursting technique, the pipe re-lining equipment is very non-invasive and requires only a couple of small pits to gain access to the damaged pipes below ground. The re-lining process is particularly useful for repairing damaged pipes encased in concrete slabs.
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