Los Angeles’ impressive new bridges have gotten a lot of press lately, including HNTB’s epic 6th Street Viaduct and Andrew Leicester’s unusual so-called basket bridge for the Metro Pasadena Gold Line extension. But one crossing is being worked on in total secrecy: a span over the 101 Freeway at Los Angeles Street, connecting the Civic Center and the Pueblo de Los Angeles. Artists Jenna Didier and Oliver Hess, who run the city’s Materials and Applications gallery in Silver Lake, are designing the bridge. No renderings have been unveiled, and it’s all very top secret within the city, which is why eavesdrop is on the case. And while Thom Mayne (101 pedestrian bridge) and Asymptote (Steel Cloud) have both failed to make similar ideas happen, this looks like it’s actually moving. Stay tuned.
Posts tagged with "Bridges":
Work took place in March to replace a portion of Chicago's Wells Street bridge—“the engineering equivalent of a heart transplant,” in the words of the Tribune’s Cynthia Dizikes. Work crews replaced a portion of the 91-year old double-decker bascule bridge during just two nine-day periods (a similar replacement in 1996 took almost a year). Inconvenience or not, seeing a 500,000-pound hunk of metal floating into downtown Chicago atop a barge makes one feel like a witness to latter-day Carl Sandburg paeans: “Here is a tall bold slugger set vivid against the little soft cities.”
HNTB's Squibb Park Pedestrian Bridge connecting the Brooklyn Heights Promenade with Brooklyn Bridge Park opened to the public last Thursday. The $4.9 million bridge was built using "trail bridge technology" with galvanized steel cables and cylindrical black locust timbers, providing an efficient and lightweight structure that, as a sign at the entrance to the bridge warns, quite literally puts a bounce in visitors' steps. "The bridge is very light weight. You will feel yourself walking across the bridge," HNTB's Chief Engineer Ted Zoli said at a construction tour in December. On AN's visit to the bridge Friday morning, traversing the spans did in fact provide a bouncy effect. The 400-foot-long Squibb Park Pedestrian Bridge zig-zags through Brooklyn Bridge Park, moving through what will one day be a mixed-use development on the park's edge designed by Rogers Marvel Architects and providing a crucial connection to the Brooklyn Heights neighborhood which sits largely cut off from the waterfront by the Brooklyn-Queens Expressway. Concrete piers support the main bridge spans across Furman Street and through the park, which gently decline from a height of 50 feet to the waterfront park. LED lights are incorporated into the handrails that will wash the pathway with light in the evening.
From the top of San Diego's soaring 200-foot-tall Coronado Bay Bridge, architect Lew Dominy says you can see Mexico, but outside of special events when the bridge is closed to automobile traffic, pedestrians and bicyclists who might stop to admire the view are prohibited. Dominy, principal at San Diego-based domusstudio architecture, has a plan to build a tube through the distinctive archways of the Coronado's support piers that would bring multi-modal access to the bridge. Dominy hatched the concept three decades ago while riding his bike across the bridge during a special event. "When you're 200 feet in the air looking at the city, it's just an unbelievable view," Dominy said. At the time he was interning for the the Coronado Bay Bridge's designer Bob Mosher, and developed an interest in the 11,179-foot-long span connecting the cities of San Diego and Coronado. Dominy shelved the proposal, but recently began promoting the concept anew. Over the past six months, he has been meeting with officials from the US Navy, the Cities of San Diego and Coronado, the bridge's owner CalTrans, and others to promote the idea and determine if the project is feasible. Dominy said the response so far has been positive. "With all the agencies and jurisdictions involved, this will take some time to become real," Dominy said in an email. "But the momentum is building, and we have gotten very positive responses everywhere we've been with the project. We think it could be an iconic draw for cyclists and runners and visitors to San Diego." The plan, estimated to cost around $50 million, calls for a steel cylinder to be built inside the 12-foot-diameter pier arches, with structural attachments to the bridge's existing steel box girders. After speaking with engineers who retrofitted the bridge for earthquakes a decade ago, Dominy said "it appears from initial analysis that no extra support is needed" for the new bike tube. The bridge is built with a 4.7 percent grade, meaning the ascent and descent over the two mile length of the bridge fit within existing ADA regulations. Dominy said the tube structure would be open but include railings and other protections to keep people from falling or jumping. He said the design could also include viewing areas at various points with glass floors to heighten the drama of the view. To move the project forward, Dominy hopes to raise funding for a feasibility study, that among other things, will help determine if adding the bike and pedestrian tube will impact clearances of large ships that move underneath the bridge.
It’s been nearly a year since the Santiago Calatrava-designed Margaret Hunt Hill Bridge opened in Dallas. Part of an overarching plan to redevelop the banks of the Trinity River, the cable-stayed bridge’s 400-foot-tall central arch pylon has given the Big-D a much-needed civic icon in the otherwise flat and uninhabited swath that the watercourse cuts through the urban fabric. These photos, taken by budding young photographer Halle Darling-Menking, convey something of the motion and excitement motorists experience while traversing the span. The lines of the cables seem to warp and flex, the arch itself to deflect and lean. Fans of the crossing now have something more to cheer about. In January, the Dallas City Council approved funding for a second Calatrava-designed bridge across the Trinity, this one expected to cost $115 million. The second bridge, to be known as the Margaret McDermott Bridge, will replace the current Interstate 30 span. It features two arches running parallel to the span supporting pedestrian and bike paths. Construction will begin this spring and completion is expected by May 2017.
It's been a mild winter so far in New York, and with the first onset of below-freezing temperatures, city folk are donning their heavy jackets and gloves. And while the winds whipping around the glass and steel towers of Manhattan might feel as if it's as cold as it's ever going to be, consider a century ago when temperatures were low enough to freeze the East River from the banks of Brooklyn to the Manhattan waterfront, still two different cities at the time, providing thrill-seeking pedestrians with an instant new crossing years before the Brooklyn Bridge was built. The above view was engraved in 1871 and titled, "Crossing the East River on the Ice Bridge," depicting dozens of New Yorkers walking across what would normally have been a busy maritime thoroughfare. While such a natural feat seams unlikely today, Gothamist has collected clippings to show that the phenomenon was known to occur around once a decade on the East River during the 19th century and there have been reports of similar frozen-river bridges along the Mississippi and Ohio Rivers as well. For instance, in 1851, an estimated 15,000 pedestrians, horses, and sleighs crossed the frozen river.
If you have ever seen the film To Live and Die in L.A. then you know the Gerald Desmond Bridge. It has a starring role in the opening sequence, when Treasury agent Richard Chance (played by William Peterson) bungee jumps off of it. You probably haven't bungeed off it yourself, but If you've ever driven across it, you might get why it needs replacing. The original bridge, according to the project website, "is nearing the end of its intended lifespan." In fact, the old bridge, while considered safe, is a little scary. Netting has been suspended beneath it to catch pieces of falling concrete. Additionally, its approaches are too steep, it's too narrow, and perhaps most importantly, the newest container ships can't fit under it. That bridge that will soon be a thing of the past. On Tuesday, January 8, Caltrans, Metro, the Port of Long Beach, and the US Department of Transportation broke ground on the $1 billion joint project to build the state-of-the-art replacement bridge for what is considered one of the nation's most critical transport hubs. The projected five-year construction period is also expected to generate significant economic activity in the region, including thousands of project-related jobs. The new cable-stayed bridge will feature 500-foot-tall towers and an observation deck 200 feet above the water. The design also incorporates bike lanes and pedestrian walkways. The joint venture includes Shimmick Construction Company, FCC Construction S.A., Impregilo S.p.A., with engineering by Arup North America and Biggs Cardosa Associates.
Officials broke ground today on the long anticipated restoration of New York's High Bridge connecting the Bronx with Manhattan. Built in 1848 and today the city's oldest bridge, the 1,200-foot-long span had long been a popular strolling bridge, even making an appearance in Edith Wharton's 1913 novel Custom of the Country. The landmarked bridge was closed to the public in the 1970s, but after construction wraps up on the $61 million rehabilitation, strolling New Yorkers and bicyclists can once again cross high above the Harlem River—116 feet—and connect with the city's growing waterfront Greenway. (See also: Photos of High Bridge before renovation.) Improvements include pedestrian safety measures like accessibility ramps, viewing platforms, and new lighting. An eight-foot-tall cable mesh fence to prevent jumpers and throwing trash will also line each side, a point that drew criticism from some in the community who believe it's unnecessary and will spoil views. In a statement released at the groundbreaking ceremony, Mayor Michael Bloomberg called High Bridge "one of our city's great treasures." He continued, "It will bring people here from all over the five boroughs, and even all over the world, to see some of the most spectacular views in the city."
The expansion of LA's Metro Rail Gold Line is well underway with a stunning new piece of infrastructure: The Gold Line Bridge. Completed last week, the 584-foot dual-track bridge, stretching over the eastbound lanes of the I-210 Freeway, will provide a light rail connection between the existing Sierra Madre Villa Station in Pasadena and Azusa’s future Arcadia Station. The rail line itself is scheduled for completion in 2014. Made from steel reinforced concrete with added quartz, mica crystals, and mirrored glass, the monochromatic, abstract design, conceived by artist Andrew Leicester, pays homage to the region’s historic American Indian basket-weaving tradition and includes a carriageway and a post-and-lintel support beam system. The 25-foot baskets adorning each of the posts, “metaphorically represent the Native Americans of the region...and pay tribute to the iconic sculptural traditions of Route 66,” wrote Leicester. The bridge is is also designed to withstand significant earthquakes. Equipped with "Time Domain Reflectometry" technology and an electrical feedback smart column technology system, engineers can initially assess damage following a tremor. The structure replaces one removed after the 1994 Northridge Earthquake and is truly an exception to the norm of form follows function. The 11.5-mile Foothill Extension project, overseen by the Metro Gold Line Foothill Extension Construction Authority, is being built by Skanska USA and their subcontractor AECOM.
Before the end of this year, the Squibb Park Pedestrian Bridge will be completed connecting Brooklyn Heights with the Brooklyn Bridge Park on the waterfront. This windy path over the BQE and through the treetops will quite literally bridge the divide and substantial grade shift between the neighborhood and the park. Construction of this $4.9 million pedestrian bridge, made of black locust timber and galvanized steel, is already underway, and on December 14th and 15th, the spans will be hoisted into place over Furman Street. HNTB's chief engineer Ted Zoli chose materials that were consistent with the landscape design of Brooklyn Bridge Park designed by Michael Van Valkenburgh. “The bridge is very light weight. You will feel yourself walking across the bridge,” Zoli said at a hard hat tour of Squibb Pedestrian Bridge at Brooklyn Park this afternoon. While the pedestrian bridge represents a contemporary solution, it is also a throwback to a pre-Robert Moses era when there was direct access to the water before the highway was built. “It is like a gangway,” said Zoli. “It is like how you used to walk to vessels on the water.”
We could't help noticing that LA's new Sixth Street Viaduct, which is being designed by a team led by HNTB, bears a striking resemblance to Dubai's Meydan Bridge, the royal VIP entrance to the Meydan racetrack where the prestigious Dubai World Cup is held annually. The bridge was featured in the recent film, Mission Impossible: Ghost Protocol, but sits empty for most of the year. Of course there are differences between the two: Meydan's arches are made of steel, not concrete, it's not cable-stayed, and its upper arches don't touch the ground, but they're still very close in all their wavy glory. Judge for yourself below. HNTB's Sixth Street Viaduct in Los Angeles: VS The Meydan Bridge in Dubai.
In September, AN reported on the three proposals to replace Los Angeles' iconic but crumbling Sixth Street Viaduct by HNTB, AECOM, and Parsons Brinckerhoff. The three teams have notably added pedestrian amenities and adjacent lush landscaping to the 3,500-foot-long cable-stayed span. While the renderings were compelling for each design, these video renderings fly the viewer in and around each proposal for a more detail view of what might soon be built in LA. Take a look. Courtesy AECOM Courtesy Parsons Brinckerhoff Courtesy HNTB [Via Curbed LA.]