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5/12/2016
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Superstructure Bridge Slide – Michigan M-100Presented by: Donald Yetter, PE, SE - AECOM
Picture here
Photo by MDOT Photography Unit
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• Project overview• Considerations for ABC • Proposed bridge• Temporary substructure and approach slab• Sliding operations• Construction• Lessons learned
OUTLINE
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• Potterville, MI• ADT – 5400• Overall project consisted of
replacing 3 bridges along M-100 (other 2 were stage constructed)
PROJECT OVERVIEW
Grand Rapids Lansing
Detroit
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Emergency Services
CN/GTW RR
Project Location
Interchange
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• 3-span steel superstructure• Constructed in 1940• Reinforced concrete stub
sill abutments and steel bent piers on spread footings
• 157’ long with a clear roadway width of 40’
EXISTING BRIDGE
Photo by AECOM
Photo by AECOM
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• MDOT and city officials didn’t want extended bridge closure• Part width construction not feasible• Emergency services located on the opposite side of tracks
from the majority of city• 4.5-mile detour (20 for trucks) w/ at-grade crossing• Minimize user delay costs due to detours• Space available adjacent old Bridge to build new one
CONSIDERATIONS FOR ABC
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and Photos by MDOT Photography Unit
1. Build New Bridge on Temporary Frames
3. Build Permanent Abutments 2. Remove Existing Bridge
OVERALL SEQUENCE
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• Slide-out to temporary location• Slide-in from temporary location • Build in temporary location on west side versus east
- Extensive utilities on east side
ABC OPTIONS
Photo by AECOM
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gas telephonefiberoptic electrical
Existing Bridge
New Bridge in Temporary Location
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• Single span steel superstructure• 107’-6” span on a 37.6° skew• Full height concrete abutments on steel H-piles• 44’-0” clear roadway width and 10-foot shared-use walkway• Temporary alignment located 76’-5” west and parallel to the
existing alignment
PROPOSED BRIDGE
Horizontal Beam Seat
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• Foundation Alternatives - concrete; micro-piles; vs. driven steel pile
• 2 rows HP 14 piles (pre-bored some)• Frame braced in each direction with
channels and angles• Field welded connections• Longitudinal triple W18x76 beam was
the main load carrying member• Wire face MSE wall behind frames
used to retain road fills
TEMPORARY SUBSTRUCTURE
Abutment Frame
New Superstructure
Guide Rail
Temp. MSE Wall
Temp. Approach Slab
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Photo by MDOT Photography Unit
Existing Bridge
Temporary Substructure
Temporary MSE Wall
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TEMPORARY SUBSTRUCTURE & MSE WALL CONSTRUCTION
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Photo by MDOT Photography Unit
Triple Beam Support for Guide Rail
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• C10x30 used to guide the steel rollers• Welded to top of triple beam and bolted to top of concrete
abutment• Drop-in span used to span the gap between the temporary
and permanent abutments
TEMPORARY SUBSTRUCTURE
Drop-in Span
Guide Rail
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Photo by AECOM
Guide Rail
Photo by MDOT Lansing TSG
Drop in Span
Supported on New Footing
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• Concrete approach slab tied to temporary abutments
• 2” open joint at each abutment• Level with bottom of deck
APPROACH SLAB (Temporary Roadway)
Photos by MDOT Photography Unit
Completed Bridge in Temporary Location
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• Synchronous vertical jacks placed under each end diaphragm
• End diaphragms designed for 1/16” deflection• Superstructure lifted and rollers placed under
each beam• Superstructure lowered onto rollers• Jacks and rollers located in the channel guide in
front of permanent bearings so no conflict occurred
LIFTING SUPERSTRUCTURE FROM TEMP. BEARINGS
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LIFTING SUPERSTRUCTURE FROM TEMP. BEARINGS
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Place jacks under end diaphragm
Photo by MDOT Photography Unit
Retract jacks
Photo by AECOM
Raise each end of bridge
Photo by AECOM
Photo by MDOT Photography Unit
LIFTING SEQUENCE
Photo by MDOT Photography Unit
Attach Rollers to Beams
Photo by MDOT Photography Unit
Roller
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• Steel rollers versus PTFE pads• Rollers with horizontal guide wheels for fascia girders• Larger top plate with slotted holes to allow for more
construction tolerance• Cushion pad used• Variable filler plate• Designed for µ=0.07
ROLLER SYSTEM
Girder
Fill PlateThickness Varies
by Beam
Elastomeric Pad
Guide WheelRoller
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Photos by MDOT Photography Unit
Guide Wheel (Fascia Girder)
Roller
Elastomeric Pad
Fill Plate
ROLLER SYSTEM
Fascia GirderInterior Girder
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ROLLER SYSTEM
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• Independently controlled double-acting horizontal jacks at fascia girders
• Jacks attached to saddle assembly• Saddle assembly connected to guide channel by means
of (3)-7/8”ø pins
SLIDING OPERATIONS
Insert Pins between Saddle & Guide Rail
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Photo by MDOT Photography Unit
Photo by AECOM
Photo by MDOT Photography Unit
SLIDING OPERATIONS
Pins
Clevis
and Construction Sequence before Slide
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Permanent Approach Slabs
Before Slide
After Slide
• Early strength concrete used to allow traffic as soon as possible• Cast-in-place
Sleeper SlabExpansion
Joint
Mechanical Splicer
C.I.P. Approach Slab
Expansion Joint
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• Roller system with horizontal guide wheels worked well• Actual µ=0.034 to overcome static friction• Use conservative loads in design • Draw everything in plan and elevation views at all the stages
of construction• Measure, measure, measure – perhaps survey multiple times
with different methods to ensure everything will fit• Account for construction tolerances wherever possible
- Holes for push cylinder saddle pins could have been bigger
- Or better shop QC when drilling holes in saddle & guide rails
OBSERVATIONS & LESSONS LEARNED DEBRIEFINGS
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Photo by MDOT Lansing TSG
Proactive Railroad Engagement Provided Value Tight Tolerances
Parapet MisalignmentFaster Cylinder Retraction PreferredPhotos by AECOM
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• Let project: December 5, 2014• Start construction: March 18, 2015• Traffic shifted: August 14, 2015• Road closed: Friday, Nov. 13 at 7 PM• Vertical jacking: Friday, Nov. 13 at 11 PM• Bridge slide: Saturday Nov. 14 1 AM -10 AM
(slid ~100’ in 9 hours)• Pour approach slabs: Saturday Nov. 14 at 2 PM• Road opened to traffic: Monday, Nov. 16 at 6 PM
TIMELINE
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Photo by MDOT Photography Unit
Questions
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