The International Federation of Consulting Engineers and the International Tunneling and Underground Space Association (ITA-AITES) launched a new set of contract documents specifically tailored to the challenges of underground works that involve geologic uncertainty, including tunneling and foundations.
The independent panel reviewing the investigation of San Francisco’s troubled Salesforce Transit Center is tasked with both determining the cause of brittle fractures in two bottom flanges of twin built-up plate girders and assigning responsibility for the fractures, according to Ron Alameida, director of design and construction for the public owner, the Transbay Joint Powers Authority.
Workers have completed repairs of the fractured girders at the beleaguered Salesforce Transit Center in San Francisco, shuttered since late September, some six weeks after it opened.
Geography and time weren’t on the side of Mortenson when it needed to design and build a new siphon to move 22 million gallons of wastewater as part of an upgrade to a 42-year-old water system in Oregon.
The second of two major sediment diversion projects in Plaquemines Parish, La., is closer to construction following the naming of a contractor to build the $700-million structure that will use mud from the bottom of the Mississippi River to help rebuild the state’s disappearing wetlands.
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