CABLESTAYED AND SUSPENION BRIDGES
Cadre has unique detailing experience in the design of Concrete Segmental Cable-Stayed bridges. Not widely built in the United States, Cadre is proud to be involved with preliminary design and final PS&E detailing of several structures. Selected projects are:
Chesapeake and Delaware Canal Bridge - The C&D Canal Bridge is the first major concrete segmental cable-stayed bridge structure to be completed in the Northeast where it holds the record for the longest concrete span at 230 m (750 feet). The 1,390 m (4,560 feet) long bridge is a precast segmental structure with twin parallel box girders that provide six lanes of travel to a highly congested corridor.
Clark Bridge-Alton, Illinois - The new bridge will span 4,260 feet across the Mississippi at Alton, IL, replacing the current 65 year old bridge. The river averages 40 feet deep at the center of the channel. Construction on the bridge began in June of 1990.
Roosevelt Bridge, Roosevelt Reservoir - Concrete segmental cable-stayed alternative. The $21.3 million bridge was built to take traffic off the top of Roosevelt Dam. Roosevelt Lake Bridge spans 1,080 feet across Roosevelt Lake providing two-way traffic. The original dam-top roadway was designed to allow two Model-T Fords to pass abreast, but today's recreational vehicles and full-size automobiles are too wide to permit two-way traffic.
San Francisco-Oakland Bay Bridge Self-Anchored Suspension Bridge- The Self-Anchored Suspension Span (SAS), the signature element of the new East Span, is the largest bridge of its kind in the world. At 2,047 feet, the SAS not only raises the bridge building bar to new heights, it also presents its own unique set of challenges. Cadre was initially engaged in the design phase to prepare a 3D model of Bent W2. This Bent, with all the transverse, longitudinal and vertical PT, high strength rods, Hinge K anchor bolts and anchorages to support the wrap-around suspension cable, is the most complicated and most challenging component of the entire project. During the Construction phase, Cadre originally modeled the superstructure to identify and resolve conflicts but as construction progressed, the models were also used to review/confirm shop drawings. The number of issues idntified in the 3D model and the shop drawings reviews saved the owner millions and several months of construction delays.