SERVICES / PROJECTS
We have performed structural design and rehabiliation of bridges, culverts and retaining walls for the Pennsylvania Department of Transportation, the Pennsylvania Turnpike Commission and numerous municipalities. Our designs have ranged from simple to complex and have been completed in conventional design-bid-build and design-build environments. Our dedicated staff of professionals has the expertise to provide innovative, cost-effective and sustainable engineering solutions specifically tailored to meet the needs of our clients.
Our design experience includes the following:
• Conventional and accelerated bridge construction designs
• Composite steel rolled beams and plate girder bridges
• Horizontally curved and highly skewed steel plate girder bridges using 3D analysis
• Prestressed concrete bridges including Bulb T-Beam, Box Beam and I-Beams
• Integral abutment designs
• Shallow and deep foundation systems
• Reinforced concrete retaining walls
• MSE retaining walls and MSE abutments
• Soldier pile and lagging walls
• Precast and cast-in-place concrete culverts
• Pedestrian bridges
• Timber bridges
Route 28, Allegheny County, PA
SR 0028, Sections A09 & A10, Allegheny County, PA
This project involves roadway and structures preliminary and final design support to Michael Baker Jr., Inc. (Baker) for a high priority section of SR 0028 in the City of Pittsburgh.
As part of Preliminary Engineering, our tasks include preparation of a gap right-of-way plan and preliminary TS&L devleopment on retaining wall designs through the cooridor. As part of Final Design for Section A09, we completed the design of 2 simple spans (including the 204’ Span 24) and a 3-span continuous portion of the 31st Street Bridge. Our structure designs included deck design, plate girder design, splice design, bearing design and all other components down to the beam seats as well as coordination and review of the final pier designs. In addition to the 31st St. Bridge, we completed the designs of 4 soldier pile and lagging retaining walls.
As part of the final design of the walls, we investigated several types of retaining systems with and without tie-backs. As part of Final Design for Section A10, we completed the design of 3 truss sign structures (4 Chord Trusses founded on caissons) and 2 cantilever sign structures founded on caissons. Markosky worked closely with Baker’s geotechnical unit to modify the standard spread footing designs to caisson designs due to the right-of-way and construction restrictions. As part of the A47 contract, we completed an analysis of an existing sign structure to determine if a proposed Variable Message Sign (VMS) would require modifications to the existing member sizes.
Yellow Creek Bridge, Bedford County, PA
SR 0026- Section 009, Bedford County, PA
Markosky was the Prime Consultant for this two-lane, single-span bridge replacement project in Bedford County. Including overall project management, our responsibilities consisted of the design of the bridge and roadway, as well as management of subconsultants who provided surveying, geotechnical and environmental services. The final structure alternative was an 83’ single span spread box beam structure on full height abutments.
Due to the Average Daily Traffic and proximity to Raystown Lake, a temporary roadway & bridge was required to maintain traffic during construction. As part of Final Design it was determined that an 89’ prefabricated temporary bridge would be installed on temporary abutments. The temporary abutments designed by Markoksy consisted of a single row of piles supporting a reinforced concrete cap with sheet piling serving as the retaining structure.
Rosepoint Bridge Rehabiliation, Lawrence County, PA
SR 422 - Section L12, Lawrence County, PA
This project involved the inspection and rehabilitation of the existing reinforced concrete open spandrel arch bridge that carries SR 0422 approximately 80’ over Slippery Rock Creek in Slippery Rock Township, PA.
As part of Preliminary Engineering, Markosky completed the hands-on rehabilitation inspection of the entire structure utilizing an “under bridge inspection unit” to access the arch components. In addition concrete cores were obtained at various locations on each component type to determine the concrete compression strength and chloride content for the evaluation of the existing conditions. As part of the analysis of the structure, a rating evaluation with structural repairs were compared to existing ratings to determine the optimal repair method.
Through Final Design, the analysis and repair methods were optimized and construction details were developed for each repair type. The final structure plans were developed with references to each detail developed on plan and elevation view. As part of our Construction Services contract, we were informed by the Contractor that the structure plans were clear, concise and “easy to follow”.