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Coring
 
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1.   Prior to coring, paint a white mark on the pavement extending past the area to be cored. This will ensure that the core will be reinstated back in the pavement in the same orientation as it was extracted.
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2.   Position the coring unit over the location to be cut. Deploy the coring units’ stabilizers to isolate and remove the suspension of the truck. Adjust the coring unit so the coring drum will be cutting perpendicular in both plains to the horizon, not the roadway.
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3.   This is important in order to neutralize the effect of gravity on the core. Because most roads are crowned to allow ground water to run off to the shoulder, or if the road is on a grade, the road surface is not parallel to the horizon and the force of gravity acting on a core drum that is not vertical and plumb to the horizon, could cause the core to become stuck in the drum. Also a core that has not been cut perpendicular or plumb to the horizon will, due to the effect of gravity during reinstatement, cause the bonding compound to migrate to the lower side of the core, and not properly encompass the core for a proper reinstatement. That is why the coring unit must be capable of adjusting its orientation to be parallel to the horizon in both planes.
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4.   Begin the process of coring.
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5.   Once the coring drum has scored the pavement, set a pavement protection plate over area to be cored. This plate will help prevent damage to the core should it become stuck inside the core drum, and the core needs to be pushed out with a pry-bar through the access holes in the top of the drum.
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6.   In most coring units, cooling and lubricating water automatically flows through the water swivel down the inner surface of the coring drum and through the center pilot shaft and into the kerf, where it cools the drum and flushes out coring debris as the coring operation proceeds. Until the cutting edge of the drum completely seats itself in the pavement, additional water from an auxiliary source should be added at the cutting edge of the drum. Make sure that you have adequate amounts of water to aid in removal of the slurry created by the cutting action and to keep the cutting edge of the drum cool. Periodically raise and lower the coring drum to help to flush out debris from the kerf. Expect to cut at a rate of approximately 1” per minute. To extract the core from the roadway a center pilot hole will need to be cut. If the drum does not come equipped with a center pilot bit that simultaneously cuts a pilot hole through the center of the core a center access hole can be cut with a bar hole drill to create an access hole before the coring process begins.
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7.   Once the core has been cut to the full depth of the pavement, use a specially designed core pulling tool with an expandable rubber stopper to extract the core from the pavement.
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8.   For heavy cores utilize the eye hook at the top of the core puller to inset a pry bar through, and share the load between two workers. For extremely heavy cores employ a truck mounted core hoist to remove the core. A typical 18-inch diameter core, 8 inches deep weighs about 170 lbs. A 24-inch diameter core, 8over -inches deep weighs 300 lbs.
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9.   For heavy cores utilize the eye hook at the top of the core puller to inset a pry bar through, and share the load between two workers. For extremely heavy cores employ a truck mounted core hoist to remove the core. A typical 18-inch diameter core, 8 inches deep weighs about 170 lbs. A 24-inch diameter core, 8over -inches deep weighs 300 lbs.
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10.   Vacuum excavation can now proceed.
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Coring
 
Keyhole coring is a procedure that involves cutting a circular core in the concrete, asphalt or concrete/asphalt pavement, removing it and setting it aside for future reinstatement. Once the opening in the pavement is cored and the core removed, vacuum excavating can commence to expose the utility and various operations and maintenance activities can be completed through the keyhole.

Coring equipment is typically mounted on trucks, trailers or skid steers, and should have the capability to cut cores up to 22” in depth.

The typical diameter of core cut for most keyhole activities ranges from 12” to 24”, with the 18” diameter being the most commonly used size.
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