Transcript Rapid Lift Bridge Replacement - Gordon`s Corner Over Route 9 Bridge

Gordon’s Corner Road
Over US Route 9
Mahesh Patel, P.E.
George Afful, P.E.
Gregory Bitsko, P.E.
About the Bridge
•
Built in 1939
•
Two span concrete encased steel girder bridge with an
open joint at the centerline of the deck creating four
superstructure quadrants/sections.
•
Vertical underclearances
–
13’-9” southbound
–
14’-0” northbound
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Bridge exhibits numerous locations of impact damage
with loss of encasement and damage to bottom flange
of fascia stringers.
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Numerous overhead utilities impact constructability.
These lines cross immediately over the east and west
abutments of the structure and cross Route 9 above the
north fascia of the bridge.
About the Bridge
Proposed improvements
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Replace the entire superstructure and deck to increase the
underclearance to a minimum of 15’-0”
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Electro-Chemical Chloride extraction for substructure preservation
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Prefabricated superstructure units to reduce the construction
duration
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Self-Propelled Modular Transporters (SPMTs) to remove existing
superstructure in sections and install replacement units without
relocating utilities
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Superstructure replacement will be completed in ONE weekend,
beginning at 9PM Friday and ending 6AM Monday. No other
significant traffic impacts anticipated.
Self-Propelled Modular Transporters
(SPMTs)
•
Heavy lift system traditionally used in the oil
industry
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A series of interconnected or linked modules,
which are computer controlled to operate as a
single lifting unit
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Each module has its own power supply
system and has an unrestricted range of
movement on the ground
•
System can move forward, backward,
sideways, diagonally, as well as in circular
and carousel (spin) motions
•
Units adjust vertically between 10” and 16”
depending on the manufacturer.
Video presentation
Island Park Bridge
Ottawa, Ontario
To start video, double click photo
North
US Route 9
North
Alternate
Ramp
Access
US Route 9
Alternate
Ramp
Access
Staging Area
(Municipal Parking Lot)
Southbound Demolition
North
Alternate
Ramp
Access
US Route 9
Alternate
Ramp
Access
Staging Area
(Municipal Parking Lot)
Southbound Installation
North
Alternate
Ramp
Access
US Route 9
Alternate
Ramp
Access
Staging Area
(Municipal Parking Lot)
Northbound Demolition
North
Alternate
Ramp
Access
US Route 9
Alternate
Ramp
Access
Staging Area
(Municipal Parking Lot)
Northbound Installation
Advantages
•
Eliminates 8 to 12 months of utility relocations vs. crane installation.
•
Eliminates daytime lane restrictions for utility relocation.
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Saves over $600,000 in estimated utility relocation costs.
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Work will be completed in one weekend rather than 10 to 14 months.
SPMT Considerations
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Pick weights generally not a concern.
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Allows multiple construction activities to occur concurrently
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Construction activities no longer “linear”; reduces time.
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SPMT’s can be costly. $375,000 for equipment on this project.
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Staging area selection critical. Close to site and adequate area required.
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Different suppliers use different techniques affecting staging requirements.
SPMT Considerations
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Check utilities in staging area. Still need lifting equipment.
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SPMT costs requires very compressed construction schedule. Design and
planning are critical.
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SPMT use can’t be dictated. Use incentive/disincentive provisions with very
compressed schedule to “encourage” use. Refer to FHWA website.
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Provide detailed equipment specifications. Similar systems are not the
same. Circular, carousel and crab movements are critical to defining SPMT.
•
Get the suppliers to visit the site!!!
Project Design Considerations
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Pier set as control for geometry - narrow width.
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Existing headers removed to top of seats to eliminate conflicts.
Prefabricated superstructure with replacement headers.
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Removing headers provides greater width to accommodate construction
adjustments.
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Existing wingwalls removed to top of seats to eliminate conflicts. Partial
demo required to replace bridge parapet, demo simply extended.
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Steel bolster eliminates one round of grouting.
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Disc bearings provides greater construction tolerances.
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Innovative incentive/disincentive provision. Incentive period ends 6PM
Sunday, disincentive begins 6AM Monday.
Thank You!