© 2010 Utilicor Technologies Inc.
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Utilicor Process, Pilot Bit and Integral Center Pilot Hole
The central pilot bit and related pilot hole, are unique to the Utilicor process,
and perform four important functions in Rotary Coring and Reinstatement:
(1)
Accuracy:
The 2 3/8" diameter bi-cone central pilot bit, which is
integral to the Utilicor coring process, acts as a concentric guide for the
coring drum, centering and stabilizing it to ensure a fast and accurate
cut. It is the same type of robust, high-performance bit that is used in
the drilling industry to quickly and accurately cut through rock and
other tough materials.
(2)
Access and Handling:
The central pilot hole, created by the pilot bit,
provides a convenient access for the core-puller by which the core or
coupon is removed from the pavement and by which it is repositioned
back into the pavement during reinstatement after completion of the
repair. Other coring processes which do not employ an integrated
central pilot bit must either drill a separate bar hole in the core, insert a
separate lifting ring into the core or use some form of clamping
mechanism or other device to lift the core out of the hole after cutting
and to accurately refit the core back into the hole after the repair. This
involves an extra step and adds more complexity to the coring process.
(3)
Strength and Stability:
The central pilot hole, when filled with
Utilibond™ increases the bonding surface of a typical 12" deep 18"
diameter core by almost 100 square inches (a 13% increase in bonding
surface area) and adds strength to the reinstatement process. In
addition to increased surface bond strength, this central column of
Utilibond™ acts as a continuous stabilizing link between the replaced
core and the Utilibond™ impregnated bed of pea gravel at the base of