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Case Study—56m x 3m Warren Truss Railway Bridge, Tamworth Client: Bellway Homes / Amey Location: Anker Valley, Tamworth Length: 56.0m Width: 3.0m Form: Cambered Warren Truss with overhead bracing Project Description This bridge provided a crucial infrastructure link to a Bellway homes site in Tamworth. Without the bridge the housebuilder was unable to release his properties for sale and CTS were approached when a particularly fast-track service was needed. CTS carried out the design in-house using our experience of similar structures to create a bridge some 60% lighter than the consultant’s scheme design that we had first been presented with. This benefitted both the build time and the project cost. A Tuned-Mass-Damper (TMD) is used under the deck at the midspan of the bridge. This limits vibrations and provides pedestrian comfort in the long span structure. TMDs for bridges are typically prohibitively expensive and are fabricated outside the UK – by bringing the TMD detail design and fabrication in-house we were able to make this technology affordable and deliverable within the project timescale. The bridge crosses a Network Rail line and was subject to a Category III design procedure; CTS’ Chartered Engineers worked closely with 3rd party checkers Amey, the Technical Approval Authority at Staffordshire County Council and Client Bellway to ensure a smooth approval process appropriate to the fast-paced nature of the project. Installation was planned and carried out by CTS during a night time rail closure using one of the largest cranes in Europe. Happy homebuyers moved in on time - just days after the bridge completion.

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