Keyhole Technology

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Keyhole Technology Atlanta Service Center
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Excavation Innovation
1800-1900 Hand Digging
1902-until Horse and Carriage
Prehistoric Sharp Sticks
1900-1950 Trenching Machines
1990-Present Coring and Restoration
-Present Traditional Crew Truck
Keyhole is the latest progression in technology
for underground repair
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Keyhole Technology is a 5 Step Process
Step 1
Step 2
Step 3
Step 4
Step 5
Vacuum
Repair
Backfill
Restore
Core
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The Atlanta Service Center conducted a 30 day
pilot of keyhole and found it produced favorable
results.
Benefits

• Overall process (repair and restoration) time
  reduced
• Less time to excavate roadway surface and base
  30 minutes
• Less inconvenience to vehicular traffic
• Controlled size of opening
• Circular hole prevents stress cracks due to
  elimination of corners
• No excavation settlement due to non-shrink
  characteristics of flowable fill
• Existing material (original core) replaced back
  in hole no trash removal
• No paving cost
• Fuel savings from higher mpg
• Regulatory favorability-city officials, DOT, GUCC
• Less physical exertion resulting in less workers
  comp, 0 accidents on keyhole crew

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Benefits Comparison
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The 1st AGL keyhole!
An anode was installed and the core was properly
restored. Note the white lines allow for proper
realignment of the core to its original position.
Previous pavement cut
30 minutes after the core was restored, the
road was ready for travel. Note, the aesthetics
of the core compared to a previous pavement cut.
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10 Processes Implemented

• Spotting services and mains
• Emergency squeeze off plastic
• Belljoints encapsulation
• Belljoints injection
• Small diameter leaks
• Kills - plastic
• Kills steel
• Plastic cap repair
• Anodes
• Test wires

During the 1st phase (2005), the above processes
were implemented. In 2006, we will conduct
training and implement additional processes
involving medium pressure.
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Results

• We have experienced 60 improvement in
  manhours/job
• We have experienced a 60 improvement in
  cost/job
• We save 550 on paving for every core drilled