Manufacturing Industry
Keyholing: attracting renewed attention.
Underground Construction, February, 2004 by Griffin, Jeff
It's a familiar sight in cities around the world. Several workers wait as a backhoe makes a large excavation in a street. so that repairs can be made to a buried utility. Traffic slows while work is completed, the excavation filled in and the hole in the street, is repaired.
Very often, there is a better, faster, less expensive way to do such jobs.
"Keyholing" is the process of making a small, precisely controlled hole to access buried utilities and then using specialized tools to perform any of several repair, maintenance or installation tasks.
Keyholing is not new--speciality contractors have been doing it for 40 years. In fact, the first, vacuum excavation machines--truck-mounted air excavation models--were developed to perform what came...
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