MASSENA LATERAL BRIDGE SLIDE CASE STUDY · MASSENA LATERAL BRIDGE SLIDE CASE STUDY . PRESENTATION...
Transcript of MASSENA LATERAL BRIDGE SLIDE CASE STUDY · MASSENA LATERAL BRIDGE SLIDE CASE STUDY . PRESENTATION...
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J I M N E L S O N , I O W A D O T
MASSENA LATERAL BRIDGE SLIDE CASE STUDY
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PRESENTATION OUTLINE
• Project overview
• Proposed replacement concept and details
• Construction
• Lessons learned
• Acknowledgements
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PROJECT LOCATION
• IA 92 over Small Natural Stream, 1.0 mile west of Jct.
IA 148
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PROJECT LOCATION
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EXISTING STRUCTURE
• 40’ x 30’ Steel I-
beam
• Constructed 1930
• Reconstructed 1949
• Overlay 1968
• Retrofit rail 1992
• Overlay 1998
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EXISTING STRUCTURE
• Structurally deficient
– sufficiency rating is
38.2
• Bridge is not
adequate for legal
loads – posted
“One truck at a
time.”
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PROPOSED REPLACEMENT BRIDGE
• Pretensioned Prestressed Concrete Beam Bridge
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MOBILITY IMPACTS
• Detour traffic for duration of construction
• 7 miles out of distance travel for detour
• AADT (2012) – 1,460 w/ 16% trucks
• User costs for 180 day detour
• Indirect $437,000
• Direct $15,000 (Co. Road Maint. & Detour Signing)
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PROJECT STAGING AREA
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UTAH DOT WANSHIP BRIDGE SLIDE
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BRIDGE CONSTRUCTION VISUALIZATION
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SEMI-INTEGRAL ABUTMENT
• Abutment Diaphragm Details – sheet number 14
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SLIDING PAD
• Superstructure Details – sheet number 15
• Bonded PTFE surface on bearing pad detail
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CONSTRUCTION
• Let April 16, 2013
• Winning bid $1.3 Million
• Traditional construction estimate $977,000
• Bridge unit cost - $112/SF
• Historic bridge unit cost - $85/SF
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BID HIGHLIGHTS
• Removal of existing bridge - $60,000 (3x)
• H-piling - $167,200 (1.3x)
• Mobilization $100,000 (8%)
• Prefabricated bridge superstructure move $172,000
(1.7x)
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CONSTRUCTION MILESTONES
• July 8 – Contractor moves in to site
• August 12 – Falsework completed
• September 6 – Bridge deck placement
• September 18 – Bridge test slide (roll)
• September 27 – Begin critical closure
• September 30 – Bridge slide
• October 6 – End critical closure
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CRITICAL CLOSURE SCHEDULE
Activity 1 2 3 4 5 6 7 8 9
Start Critical Closure
Bridge Removal and Grading
Pile Driving
Revetment
Abutment Footing
Bridge slide
Precast wings
Granular Backfill
Bridge Barrier Rail
Approach paving
Barrier End Sections
Steel Guardrail
Longitudinal Grooving
Pavement Marking
Finish Critical Closure
Day
9/27/2013
10/6/2013
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FALSEWORK
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FALSEWORK
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PPC BEAMS AND DECKING
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SUPERSTRUCTURE COMPLETE
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SUPERSTRUCTURE COMPLETE
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PRE-TIED CAGE
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BRIDGE DEMOLITION
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H-PILE TEMPLATE
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HP 14X117
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ABUTMENT FOOTING
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HIGH STRENGTH RODS
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HIGH STRENGTH RODS
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ROLLER
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SLIDE JACK CONTROL
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JACKING FRAME
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SLIDE TRANSITION
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START OF SLIDE
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SLIDE
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TRANSITION POINT
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SLIDE NEARS COMPLETION
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ROLLER REMOVAL
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BRIDGE JACKING
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ROLLER
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SLIDE CHANNEL ON FALSEWORK
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PRECAST WINGWALLS
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DIAPHRAGM AND WING
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FALSEWORK SEAT
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SUBDRAIN
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ABUTMENT BACKFILL
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APPROACH AND BARRIER
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APPROACH CONNECTION
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CF JOINT
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CONSTRUCTION TIME LAPSE
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LESSONS LEARNED
• Designer/Owner
• Let ABC projects similar to steel bridges (fall letting)
• Incentive/Disincentive specification definitions
• Precast/CIP option for substructure units
• Be prepared to fully evaluate impact of contractor method changes
• Elimination of stainless steel sole plate
• Rolling in jacking pockets
• Do not allow re-use of laminated neoprene bearings
• Add a specification requiring falsework design engineer to
inspect and accept falsework construction
• ABC project design team time
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DESIGN TEAM TIME
• Design Engineer 97 hours
• Detailer – 338 hours
• Check Engineer – 168 hours
• Total 603 hours
• Submittal Review Engineer – 137 hours • Structural steel – 2 hours
• Falsework plans and calculations
• Precast wingwalls
• Prefabricated superstructure move plans and calculations
• Prefabricated superstructure move procedures 9/25/13
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LESSONS LEARNED
• Contractor
• Channel guide flexibility
• Communication method for slide technique
• Fewer splices in high strength threaded rod
• Contracts with subs
• Falsework design
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MASSENA LATERAL BRIDGE SLIDE WEB SITE
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ACKNOWLEDGEMENTS
• Designer – Iowa DOT
• Constructability Review – Michael Baker Corporation
• ABC Peer Exchange – Utah DOT
• ABC Detail Testing – Iowa State University
• Construction Administration – Iowa DOT
• Prime Contractor – Herberger Construction Co., Inc.
• Contractor’s Engineer – Tometich Engineering, Inc.
• Precast Wing Supplier – Cretex Concrete Products
• Precast Beam Supplier – Cretex Concrete Products
• HfL Grant – FHWA