transportation Archives - - Page 2 of 3 Infrastructure Digest

Denver Contractor Tears Down Rail Transit Bridge Shortly After Its Completion

Crews from Denver Transit Constructors (DTC) demolished a major rail bridge in north Denver last month—just as the structure was nearing completion.

The 555-ft-long Jersey Cutoff Bridge, which began construction in August 2012, was torn down due to “design deficiencies,” says Kevin Flynn, spokesman for the FasTracks Eagle P3 segment of Denver’s Regional Transportation District, the project owner.

Why should you read this? Not a long article, and no real detail; still, dismantling a just-completed bridge is one of the more interesting screw ups I’ve heard about recently. ENR, November 2014


Paving Of Vail Pass Results In High Incentive Dollars

“The paving began June 21, 2011 and was completed on September 18, 2011. The Vail Pass project consisted of two lanes on the westbound and one lane on the east bound between mile marker (MM) 180 and MM 190. After the subcontractor, Alpha Milling, milled the existing asphalt 2 inches, Lafarge followed with a paving train. Key equipment used was a Cat AP-1055D and Barber Greene BG650 windrow elevator.

“We used approximately 32,965 tons of asphalt to complete this project,” says Justin Jordan, superintendent at Lafarge. “We used a SX75 58-28 virgin mix without reclaimed asphalt pavement (RAP).”

The PG 58-28 binder is a softer binder that is predominantly used in geographical locations with higher elevations. It theoretically upholds to the freeze and thaw cycle better and reduces cracking potential.” Paving case study, in extreme conditions. I used to drive this beautiful, high-altitude pass monthly. FCP, June &th, 2012


Which Urban Freeways Are Ready to Go?

“To many city-dwellers, the obsolescence of aging urban highways is obvious. Here in Philadelphia, for instance, I-95 is fast-approaching the end of its design life. What will become of it — particularly a three-mile stretch along the Delaware River that divides the city from its waterfront — has occupied the concern and imagination of residents and city planners alike.

It’s an issue that many U.S. cities face as they still reel from the legacy of mid-20th century highway construction and the present threat of infrastructural failure.

The Congress for the New Urbanism (CNU), which has long been a proponent of more walkable and less automobile-oriented cities, hopes to quicken the process by identifying urban freeways primed for demolition crews. Following a similar report in 2010, CNU’s 2012 Freeways Without a Futures report lists 12 urban freeways throughout North America based on the following factors: “The age and design of structures, redevelopment potential, potential cost savings, ability to improve both overall mobility and local access, existence of pending infrastructure decisions, and community support.”

Here are the freeways listed:” As infrastructure professionals, we don’t often think about which freeways to remove; but, it’s bound to be the right thing to do sometimes.  Next American City, August 30,2012


Port of Stockton

“Today, the Port stretches across an 809-hectare operating area, World Port says. In addition, it can berth 17 vessels and has 102,000 square meters of dockside transit sheds and 715,000 square meters of warehouses, which are served by rail.

“The Port is near the country’s highway system and two transcontinental railroads,” World Port says, adding that the Port of Stockton handled more than 2 million tons of cargo in 2008.

Its channel averages 11 meters deep, leaving it capable of accommodating 45,000- to 55,000-ton vessels that are up to 275 meters long. “All berths are operated by the Port of Stockton and can accommodate vessels with maximum draft of 11.3 meters,” World Port says.” Interesting overview of an important but lesser-known port. Energy & Infrastructure


Flatiron/Parsons

“For years, construction of a people mover to connect the Bay Area Rapid Transit (BART) Coliseum Station with the Oakland International Airport instead of using buses has been considered. Finally, after years of planning and funding challenges, the design/­build project is under construction by a joint venture of Flatiron, a Firestone, Colo.-based heavy civil construction company, and Parsons, a Pasadena, Calif.-based engineering firm.

In a development familiar to the San Francisco Bay area’s residents, instead of using the operated self-propelled vehicles powered by a third rail on the tracks – which would require a heavy concrete structure and track supports – the connector’s automated people mover vehicles will be cable-propelled in a modern version of the cable cars that made so many visitors leave their hearts in San Francisco.

Designed, supplied and operated by Doppelmayr Cable Car, a Wolfurt, Austria, company, the system applies the company’s decades of expertise in mechanical ropeway technology to solve another transportation challenge. “Their background and history has all been in ski lifts and gondolas throughout Europe,” Project Manager Tony Inocencio explains. “So what they’ve done is use that technology that they’ve perfected for the ski lifts and applied it to the automated people mover system.”” Brief look at innovative, cable-propelled people movers at Oakland Airport. Energy & Infrastructure


ROADSIDE VEGETATION: Prairie view

“It quickly became apparent that a native prairie restoration would provide the benefits we desired and mitigate the physical and political hazards that existed.” How one Iowa county addressed problem vegetation on roadsides with native plantings. Roads & Bridges, 6-6-2012


Revealing the inner lives of bridges

“The system measures the frequency response of the structure, called a dynamic signature. MBTA employed it both to refine the load rating and to continue monitoring the bridge until the rehab was completed.” This is a mature monitoring/diagnostic technology that is just now seeing widespread use. Good for prioritizing bridge repair work. RAI, June 2012


Georgia project uses ‘roadbots’ for highway repair

“The new automated system requires only one operator and is faster than traditional methods, even though it only travels at three miles per hour.” It’s for crack sealing, and it’s not exactly mature technology, but the prototype is promising. Gov’t Computer News, 6-28-2012


Oregon sign recycling project proves 41% savings in Phase I

“… the first phase of 500 hydrostripped and refaced aluminum street signs has proven a 41% overall savings within the state sign budget.” Saves money, is reasonably green, and provides some jobs; what’s not to like?Public Works, June 2012


ASCE forms standard committee for permeable interlocking concrete pavements

The scope of the standard guideline will address use of PICP in road applications with loading conditions not to exceed 80,000 pounds.” PICP is an attractive way to reduce impermeable surface in urban settings and potentially get some green credits, so it will be nice to have some guidelines. And here’s a useful overview from the EPAPublic Works Magazine, July 2012


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