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Laser scanning technology helped a Minnesota bridge find its third home
One of 24 historic bridges chosen for preservation by the Minnesota Department of Transportation, Bridge 5721 is one of the state’s only remaining wrought iron bridge structures. The bridge was originally built to carry pedestrians over a river in Sauk Center, Minnesota, in 1870, before modern steel production methods had become available. In 1937, the bridge was disassembled and moved to span the Little Fork River near the town of Silverdale. But more than two years ago, the structure began its journey to a third incarnation, this time as an equestrian and pedestrian bridge for the Gateway Trail in the town of Stillwater, near Minneapolis. Because of the bridge’s provenance and the desire to keep its wrought iron parts intact, the Minnesota DOT worked with new owner Minnesota Department of Natural Resources and structural engineers at HNTB and Olson & Nesvold Engineers (O.N.E.) to collect crucial data for the rehabilitation using new 3-D laser scanning technology.
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Last night, the AIA SF launched a new exhibition, Architecture of Consequence: San Francisco, kicking off a whole slew of events in its annual Architecture in the City Festival, the country’s biggest such celebration of the built environment. The exhibit explores important social needs that architects can address and features the work of four San Francisco firms—Iwamoto Scott Architecture, Fletcher Studio, SOM, and Envelope A+D—side-by-side with four Dutch firms—Van Bergen Kolpa Architecten, 2012 Architecten, ZUS (Zones Humaines Sensibles), and OMA.
The 17th-century Sospiri Bridge (Bridge of Signs) in Venice connects an ancient prison with interrogation rooms in the Doge’s Palace. The bridge crosses the Rio de Palazzo that itself slices through the palace and makes a spectacular vista as one crosses the canal bridge on the Grand Canal. This vista has been rudely emblazed for at least the past five years by a giant advertising sign the wraps the palace walls and over and under the beautiful Sospiri bridge.
Construction continues at Santiago Calatrava‘s bold Margaret Hunt Hill Bridge in Dallas after it’s signature arch was topped off in June. The cable-stayed bridge is one of three planned as part of the Trinity River Corridor Project, which aims to redevelop the Trinity River and its floodplains, improving traffic flow, increasing parkland, and providing flood protection for the region.