Gordons Corner Road Over US Route 9 Mahesh Patel, P.E. George Afful, P.E. Gregory Bitsko, P.E.

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.

Video presentationIsland Park Bridge

Ottawa, Ontario

To start video, double click photo

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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!