bridge + structural
our expertise
Patrick’s bridge and structures client list boasts Class I railroads, major passenger and transit agencies, regional and short line railroads, state departments of transportation, public utilities, and major corporations in a wide range of industries. From innovative, complex bridge and tunnel structures, to planning, studies and everything in between, Patrick recognizes the importance these structures have on the environment around us. With an eye toward safety, environmental protection, ease of maintenance, and overall cost, Patrick provides structural solutions that meet the wide variety of needs of our clients.
our disciplines
Structure Inspections + Load Ratings
Highway + Rail Structure Design
Steel, Concrete, Precast Segmental
Construction Engineering
Retaining Systems
Erection Engineering
Cofferdams + Specialty Structures
Foundation Design
Environmental + Geotechnical Engineering
Constructability + Value Engineering
Building Retrofits
Accelerated Bridge Construction (ABC) Technologies
Project Management
Owner's Representative Services
Scheduling, Estimating + Risk Management
our projects
Chicago Department of Transportation (CDOT) | Canal Street Viaduct
Originally constructed in 1926 and rehabilitated in 1983, the existing Canal Street viaduct is comprised of four complex, multi-block, multi-span, reinforced concrete two-way deck slab bridges. Given the declining condition of these structures, the Chicago Department of Transportation (CDOT) retained Patrick, as part of a team, to inspect and document the bridge condition. Adjacent to Union Station, the viaduct spans over two Amtrak tracks and to access the underside of the viaduct Patrick coordinated a right-of-entry agreement and flagging with Amtrak. The Bridge Condition Report (BCR) recommended the replacement of the bridge deck and bents, the rehabilitation of the retaining wall, and the reuse of the below grade foundations. After receiving approval of the BCR from the Illinois Department of Transportation (IDOT), Patrick prepared type, size, and location (TS&L) drawings, preliminary bridge design, a hydraulic report, and asbestos determination certification. Several obvious street-level ingress, egress, public, and emergency access doors of existing Canal Street tenants required access during construction and Patrick developed concept level maintenance of traffic plans to assess conceptual staging/phasing.