The Sacramento Bee » A gaping hole was discovered in the Oroville Dam main spillway on Feb. 7, 2017, marking the start of a crisis that eventually led to the evacuation of 188,000 downstream residents. A little over a year later, work continues between the emergency spillway weir and cut-off wall, prepping the ground for the splashpad.
University of Nevada, Reno » Mimicking the large ground motions of the deadly and damaging 1994 Northridge, California earthquake but amplified to a magnitude 7.5., the 100-ton, 70 foot long bridge was sitting on three large shake tables in the University of Nevada, Reno Earthquake Engineering Laboratory. The demonstration was the first large-scale bridge model to test five principles and techniques of accelerated bridge construction combined in one bridge model.
Washington State Department of Transportation » As the front section of the giant SR 99 tunneling machine Bertha is cut and lifted from a disassembly pit, crews are hard at work disassembling the back end of the machine through the new tunnel. This short time lapse condenses more than a month’s work into less than 30 seconds.
Washington State Department of Transportation »The inner-workings of the SR 99 tunneling machine Bertha are now fully visible from the camera above the pit where disassembly continues. This brief time-lapse video shows what seven weeks of nearly non-stop work looks like as workers dismantle the five-story-tall tunneling machine.
Robert Reich » The Trump administration, determined to overhaul and modernize the nation’s infrastructure, is planning to privatize public assets such as airports, bridges, highway rest stops and other facilities, according to top officials and advisers. In his proposed budget released Tuesday, Trump called for spending $200 billion over 10 years to “incentivize” private, state and local spending on infrastructure.
Whoa, The Slide that Keeps Coming
Redheaded Blackbelt » Video of yet another landslide on California Highway 299.
TheJournal.ie » The Beipanjiang Bridge in China’s Guizhou province was completed on September 10, 2016 after three years of construction. The bridge is now the highest in the world at 565 meters (1,853 feet) above ground and spans 1,341 meters (4,399 feet) connect the Guizhou and Xuanwei provinces, shortening the travel time from 5 hours to less than 2 hours.
Geekwire » Seattle Tunnel Partners (STP) has released a video of construction crews performing routine maintenance on Bertha, the tunnel boring machine, which includes power washing the cutting head and replacing cutting tools that weight 75 pounds each. Bertha is outfitted with 700 cutting tools (or teeth). During this maintenance stop STP has inspected 400 teeth, replacing 25.
How a double-deck highway is built inside the Seattle tunnel – with enough concrete to fill 9 football stadiums
GeekWire » The Washington State Department of Transportation (WSDOT) takes viewers on a behind the scenes construction tour of the new double-deck State Route 99 tunnel. WSDOT’s Deputy Administrator explains how the tunnel boring machine, known as Bertha, works to dig through the ground and place concrete rings to form the tunnel wall as she goes. Watch as the tunnel takes shape and construction crews build the framework and pour concrete for the roadway. It is estimated the new tunnel will use enough concrete to fill nine football stadiums.