photo by mdot photography unit - seaoi€¦ · • traffic shifted: august 14, 2015 • road...

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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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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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Existing Bridge

Temporary Substructure

Temporary MSE Wall

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TEMPORARY SUBSTRUCTURE & MSE WALL CONSTRUCTION

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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


Retract jacks

Photo by AECOM

Raise each end of bridge

Photo by AECOM


LIFTING SEQUENCE


Attach Rollers to Beams


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 AECOM


SLIDING OPERATIONS

Pins

Clevis

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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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Questions

photo by mdot photography unit - seaoi€¦ · • traffic shifted: august 14, 2015 • road...

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