Citation

Andraka T, Hutton W. APWA Reporter 2005; 72(9): 60-62.

Copyright

(Copyright © 2005, American Public Works Association)

DOI

unavailable

PMID

unavailable

Abstract

Keyhole technologies allow for new ways to conduct utilities work on roadways without either drastically interrupting public right-of-way or causing unsightly “scars” on road surfaces. Although used by electric companies since the 1960s, the technology is now finding a burgeoning field of uses. Companies that wish to use keyholes for utility work will, however, have to make significant capital investment for the proper equipment; specialized narrow-space tools a street-coring machine, a vacuum excavator, and a modified truck chassis are all necessities for this type of road work. The article also briefly outlines the process of keyholing. A core or plug is first drilled into the pavement with the street-coring machine. Upon this, the vacuum excavator is used to remove soils straight down to provide access to the utilities in need of repair. Finally, workers use specialized tools to perform the necessary work and replace with core, securing it with cement bonding materials. Many companies have found this style of repair economically viable for the long-term due to the speed and ease of repairs, despite the large front end investment it requires.