L.A.’s 6th Street Bridge Design Competition

HNTB, an engineering and architectural firm founded in Kansas City, Mo., has won a competition to redesign and replace the 6th Street Bridge over the Los Angeles River between downtown and Boyle Heights.

The double arches of the iconic 80-year-old bridge, which engineers fear would crumble in an earthquake, will be replaced with a sleek, cable-supported structure that features a “ribbon of arches,” City Engineer Gary Lee Moore said as Mayor Antonio Villaraigosa and other officials announced the winner Friday.

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Accelerated Bridge Construction (via FHWA)

Time-Lapse Video of Keg Creek Bridge Replacement – Highways for LIFE – FHWA

This time-lapse video shows accelerated bridge construction (ABC) techniques being used by a local contractor with standard equipment to replace a three-span bridge on U.S. 6 over Keg Creek in Pottawattamie County, Iowa. The $2.7 million reconstruction project is a cooperative effort involving FHWA, the Iowa Department of Transportation and the Second Strategic Highway Research Program (SHRP2). This Highways for LIFE  demonstration project was also part of SHRP2 Renewal research which created standard bridge designs that can be adapted to a large number of bridge projects. The design scales ABC methods to typical projects so that the benefits of faster construction and advanced materials are replicated wherever possible. The goal is to make ABC techniques a standard part of bridge construction. In the Keg Creek demonstration, road closure was reduced from six months to two weeks. Continue reading

Foothill Extension to Gold Line Progress (via The Source)

Work continues to proceed well on the “Iconic Bridge” for the Gold Line Foothill Extension that will bring the Gold Line from Pasadena to the Azusa/Glendora border. The photo above shows one of the supports for the bridge that will carry the tracks from the middle of the 210 freeway toward downtown Arcadia.

After the jump is a “year in review” piece by the Foothill Extension Construction Authority, the agency building the project that Metro will operate. The line is scheduled for completion in 2015 and is being paid for with the Measure R sales tax increase approved by Los Angeles County voters in 2008. Continue reading