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 • 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 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. • 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!