Posts tagged with "Bridges":
Currently the only link between the rapidly developing neighborhoods of Long Island City, Queens, and Greenpoint, Brooklyn, is the Pulaski Bridge, a six-lane drawbridge with a narrow pathway where pedestrians and bikers jostle for space. Brooklyn-based CRÈME/Jun Aizaki Architecture & Design wants to change that by proposing the LongPoint Bridge, a 250-foot-long crossing dedicated to foot and bike traffic.
The bridge is distinguished from its counterparts across the city for its lightweight, floating timber construction. It is anchored on either end by a concrete and steel mast embedded into the waterbed of Newtown Creek (the East River canal that divides Queens and Brooklyn). Glulam beams joined by galvanized steel braces and pins rise in two trussed peaks of armature around the nearly 50-foot-tall masts. The structure is a nod to the area’s industrial past and present while also referencing the iconic profiles of other bridges in the city. Its height above the canal allows smaller vessels to pass underneath, but for larger boats, the bridge pivots open in the middle, with each section moving on propeller-driven pontoons. This floating feature also allows the bridge to rise and fall with the tides.
According to Jun Aizaki, the firm’s founder and principal, the bridge’s design and timber composition allows it to be assembled off-site and installed quickly and inexpensively; in the long term, it will require only minimal repairs. CRÈME also proposes public parks and loading docks to flank the bridge on both ends, along with a pedestrian crossing over the Long Island Railroad commuter rails just beyond the canal. Together with the timber bridge, the pathway would connect commuters to the G and 7 trains on either side.
With the impending L train shutdown in 2019 and the predicted growth of Long Island City as it hosts Amazon’s HQ2, the timing of a quickly constructed, relatively affordable bridge seems ideal. Aizaki and his team, which includes a community organizer, are busy raising support and funds through meetings with public officials and local community members. For Aizaki, the bridge is intended as “a grassroots, rather than developer-initiated, project,” which he hopes will “be a symbol of something the community can be proud of."
Louisvillians lament that new highways won’t solve the city's congestion problems, though the increased number of options to pass through the city are a bonus for anyone who doesn’t wish to make a pitstop on their way somewhere bigger and better. It’s a classic, tragic story that’s hurt many American cities suffering from mid-century highway build-outs. Some are making concerted efforts to replace aging infrastructure with beautiful boulevards and walkable, shared streets, but others aren't thinking as clearly about how to keep people in town, as opposed to letting them drive on by. Kentucky’s busiest bridge, the Sherman Minton, sits further outside downtown than its counterparts. As the city’s only toll-free link to Indiana, it sees 90,000 drivers per day. The 56-year-old structure is slated to begin a $90 million rehabilitation project in 2021. Time will tell whether or not its partial or full closure during construction will force people to start crossing the newer structures that spew out of the city’s core. The Indiana Department of Transportation and the Kentucky Transportation Cabinet just ended a public input period to figure out next steps. A recommendation will be made next fall.
There are bad highways projects and then there’s this...I visited Louisville with @cnunextgen in 2014 & remember thinking this project couldn’t be real. $1.3 billion later... traffic volume has been cut in half, riverfront is cut-off & development has been hindered. https://t.co/5u8415JMEB — Nate Hood (@natehoodstp) November 28, 2018
The FIU bridge, meant to cross eight lanes of traffic at a particularly dangerous intersection in front of the school, was designed to double as an amenity deck and would have featured a bike lane for students. Instead of being constructed in situ, the span that collapsed was built on temporary supports on the side of the road, and rotated 90 degrees into position on March 10th. Using this “Accelerated Bridge Construction (ABC) method” to build the bridge’s superstructure elsewhere was touted as a way to cut costs and minimize disruptions to traffic below. According to a press release from LIU, the bridge would have also been the first in the world to have been constructed from self-cleaning concrete. It’s currently unclear whether the construction methods used to build the span played a part in the collapse, which flattened the cars underneath at the time. Miami-Dade Mayor Carlos Gimenez had said earlier that day that the bridge had just successfully completed stress testing. In a statement given to the Miami Herald, FIU President Mark Rosenberg said that the testing was done in accordance with best practices. “I know that tests occurred today. And I know, I believe, that they did not prove to lead anyone to the conclusion that we would have this kind of a result. But I do not know that as a fact.” Florida Senator Marco Rubio took to Twitter to discuss the work being done on the bridge before its collapse, saying “The cables that suspend the Miami bridge had loosened & the engineering firm ordered that they be tightened. They were being tightened when it collapsed today”. The engineering firm Rubio is referring to is FIGG Bridge Design, who were collaborating with Munilla to build the bridge. While the span was to be supported by steel suspension cables installed from a central column later on, Rubio may have been referring to tension cables inside of the bridge itself. It's unclear what form of temporary support was holding up the bridge at the time of the accident. At the time of writing, it’s unclear why engineers had chosen to stress test the bridge while allowing traffic to pass underneath, or if the cable tightening had played a role in the failure. The $14.2 million bridge, financed through a US Department of Transportation TIGER grant, had originally been slated to open in early 2019.
Engineering company BDI appears to have quickly deleted this tweet. pic.twitter.com/hA1McwVubS— David Mack (@davidmackau) March 15, 2018