Kearney Precast Concrete Deck Panel Bridge Project
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Transcript of Kearney Precast Concrete Deck Panel Bridge Project
KEARNEY PRECAST CONCRETE DECK PANEL BRIDGE PROJECT
Presented By
T. Farber, G. Marcous, J. Ridder
37th Annual Concrete Paving Workshop
January 19-20, 2016
Acknowledgements
• Nebraska Department of Roads
• University of Nebraska-Lincoln (UNL)
• Hawkins Construction Company
• CoreSlab Structures Inc.
6
Project Specifics
Prime Contractor: Werner Construction, Inc.
Contract Amount: $26.5 million
Calendar Days to complete project: 776 days
Construction Started: July 2014
Construction Costs for the Bridges
Group 6 ( NU Deck Panel ): $2.6 million
Group 6A ( Cast-in-Place ): $1.6 million
Table of Contents• Background
• Project Description
• Construction Sequence
1. Girder Production
2. Panel Production
3. Girder Placement
4. Panel Placement
5. Transverse Joints Grouting
6. Deck Post-tensioning
7. Haunch & Pockets Grouting
8. Deck Grinding
Background• Why precast concrete deck systems are not commonly
used?– Too many pieces to handle
– Too many joints to grout
– Open channels or pockets need an overlay
– Not fully pre-stressed in both directions
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Background
• The newly developed precast concrete deck system (2nd
Generation NUDECK) has the following features:1. Full-depth, full-width, 12-ft long panels to minimize CIP transverse joints
2. Covered pockets to eliminate deck overlay
3. 4 ft. spacing between shear connectors to simplify fabrication
4. Prestressed in both directions to enhance durability
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BB-EB CL: 332 ft
Span:
166 ft
166 ft
Precast:
166.17 ft
166.17 ft
1.33 f t
39 f t
1.33 f t
41.67 f t
7.5
in
3.83 f t
8.5 f t
8.5 f t
8.5 f t
8.5 f t
3.83 f t
1
2
3
4
5
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NU Deck Panel Description
5 ea. NU1800Girders
13,850 sq.ft.Bridge Deck
Construction Sequence1. Girder Production
2. Panel Production
3. Girder Placement
4. Panel Placement
5. Transverse Joints Grouting
6. Deck Post-tensioning
7. Haunch & Pockets Grouting
8. Deck Grinding
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4- Panel Placement Progress• Wednesday 07/08 afternoon only 3 panels
• Thursday 07/09 morning only 2 panels
• Monday 07/13 6 panels
• Tuesday 07/14 6 panels
• Wednesday 07/15 6 panels
• Thursday 07/16 5 panels
TOTAL 28 panels
5- Transverse Joint GroutingConcrete
TruckStart Time End Time Quantity No. of Joints Temperature
Deg. FRelative
Humidity %
#1 6:30 am 7:30 am 3 cy 13.5 63 83
#2 8:00 am 8:30 am 2 cy 7.5 65 80
#3 8:45 am 9:15 am 2 cy 6 66 78
Transverse joint concrete mixture had 6 in. initial slump and was vibrated
6- Deck Post-tensioning
Jacking End Movement = 5/16 in. Dead End Movement = ¼ in.
Predicted deck elastic shortening = ½ in.
7- Haunch & End Pocket SCC Grouting
43
H-3 H-3A G-2 J-4 K-5 F-1
4 8,120 7,240 7,480 6,790 7,380 7,860 7,402
7 8,360 7,250 7,690 7,170 7,510 7,870 7,596
28 9,200 9,050 9,170 8,430 8,420 9,030 8,854
Air Content (%) 2.6 3 4.2 4.6 4.6 4.6 3.8
Girder Batch IDAge (day) Average