Gordon’s Corner RoadOver US Route 9
Gordon’s Corner RoadOver 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
• Bridge exhibits numerous locations of impact damage with loss of encasement and damage to bottom flange of fascia stringers.
• 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 • Replace the entire superstructure and deck to increase the
underclearance to a minimum of 15’-0”
• Electro-Chemical Chloride extraction for substructure preservation
• Prefabricated superstructure units to reduce the construction duration
• Self-Propelled Modular Transporters (SPMTs) to remove existing superstructure in sections and install replacement units without relocating utilities
• 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
• A series of interconnected or linked modules, which are computer controlled to operate as a single lifting unit
• 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.
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Ottawa, Ontario
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Advantages
• Eliminates 8 to 12 months of utility relocations vs. crane installation.
• Eliminates daytime lane restrictions for utility relocation.
• Saves over $600,000 in estimated utility relocation costs.
• Work will be completed in one weekend rather than 10 to 14 months.
SPMT Considerations
• Pick weights generally not a concern.
• Allows multiple construction activities to occur concurrently
• Construction activities no longer “linear”; reduces time.
• SPMT’s can be costly. $375,000 for equipment on this project.
• Staging area selection critical. Close to site and adequate area required.
• Different suppliers use different techniques affecting staging requirements.
SPMT Considerations
• Check utilities in staging area. Still need lifting equipment.
• SPMT costs requires very compressed construction schedule. Design and planning are critical.
• SPMT use can’t be dictated. Use incentive/disincentive provisions with very compressed schedule to “encourage” use. Refer to FHWA website.
• 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• Pier set as control for geometry - narrow width.
• Existing headers removed to top of seats to eliminate conflicts. Prefabricated superstructure with replacement headers.
• Removing headers provides greater width to accommodate construction adjustments.
• Existing wingwalls removed to top of seats to eliminate conflicts. Partial demo required to replace bridge parapet, demo simply extended.
• Steel bolster eliminates one round of grouting.
• Disc bearings provides greater construction tolerances.
• Innovative incentive/disincentive provision. Incentive period ends 6PM Sunday, disincentive begins 6AM Monday.
Thank You!