Repair of Traffic-Impacted Box Beam Bridge Hawkins Road Crossing Interstate 94 in Michigan.
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Transcript of Repair of Traffic-Impacted Box Beam Bridge Hawkins Road Crossing Interstate 94 in Michigan.
Repair of Traffic-Impacted Box Beam Bridge
Hawkins Road Crossing Interstate 94 in Michigan
January 1983:Impact Breaks 7 Strands
March 1983:Second Impact Breaks 2 More Strands
The Original Shop Drawings
Repair Approach
Use District Maintenance Crew Repair Each Strand Using
Splice Chuck Coupler Hex Splice Sleeve and Two ¾ inch Diameter A449 Rods (one
right hand thread and left hand thread on the other to allow tensioning)
Hardware cost is about $175 per strand but delivery is a long five months
Splice Chucks
Cutting Damaged Strands
Installing Splice Chucks
Installing Splice Chucks
Drilling for Void Form Attachment
Installing Turnbuckles
Tensioning Rods with Stain Gauges
Installing Tensioning Rods
Strain Gauge
Tensioning Computation
Tensioning allowed for losses that had occurred during the 25 year life of the bridge
Tensioning
Tensioning was accomplished in 4 passes from the inside to the outside of the beam
All Strands Repaired
Deflecting Beams
A preload was used so that the repair-concrete would be in compression after the preload removal
A New Bridge Opening Height
Preparation for Form Attachment
Preparation of Form
Form Release Agent Applied
Form Installation
Creating Vibration Access
Final Deflection Verification
Concrete Delivery
Concrete Quality Control
Concrete Quality Control
Placing of Concrete
Vibration of Concrete
Repair Completed!
Four Months After Completion of First Repair:
Bridge was hit for the third time
Most of the splices done earlier were intact, indicating a durable repair
The damage this time was 19 of the 25 strands of the fascia beam, 7 strands of the first interior beam and 4 strands of the second interior beam.
The repair involved replacement of the fascia beam with a solid concrete beam and repair of the interior beam using the successful approach of the earlier repair.
Post Script
Shortly after the second repair was completed the bridge was hit a fourth time. This time it only suffered a nick in the solid fascia beam.