Denver demolishes bridge to rebuild I-70


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A “Mile High Shift” has been completed in Denver, sending up to 200,000 drivers 30 feet underground on Interstate 70. Now, the $1.2 billion project to expand and modernize a dangerous and degraded highway section includes the demolition of 57 general. A bridge divides neighborhoods during the 1960s when the highway was built. Central 70 will rebuild a 10-mile stretch of I-70 between Brighton Boulevard and Chambers Street, adding one new Express Lane fee in each direction. It is the largest project in the history of the Colorado Department of Transportation, to replace the 1.2-mile bridge, which no longer accommodates 200,000 vehicles a day, and to attempt to reconnect the Illyria-Swansea neighborhoods of eastern Denver, CDOT has decided to send traffic down to a lower section below the bridges and covered section. The project will also include the construction of a 4-acre park in the covered section, along with piers and bridges designed to reconnect neighborhoods. To prevent flooding, an impermeable liner under the park and over the concrete bridge deck will send drainage into pipes and eventually to the pumping station. Drivers enter new underground lanes on I-70 in Denver after the “Mile High Shift.” Colorado DOT. The trails gradually descend 30 feet between Colorado and Brighton streets. The walkways are lit by more than 1,700 LED lights under the covered partition. Crews worked around the clock during the weekend of May 21-23 to open the six new underground runways for I-70. These six lanes will replace the six eastern and western lanes that used to run the bridge. After the construction of the remaining six underground corridors, which will serve eastbound travelers, the existing corridors will then become westbound lanes. “We are extremely proud of everything our crews have accomplished since commencing in August 2018 and over the weekend to achieve this historic transformation,” said Bob Hayes, CDOT project manager. The bridge is expected to take five months to demolish, and new underground walkways will be built east once they are gone, according to CDOT The agency says: “The bridge will be demolished in sections mainly during daylight hours using excavators, crushers and concrete mills. The demolition of the bridge represents Denver’s incredible growth over the past six decades,” Hayes said. “This demolition is a major transportation milestone, but it’s also a moment to stop and think about how the Denver metro area has evolved since the 1960s.” New underground on I-70 in Denver.The park is designed to help reconnect neighborhoods that were divided in the 1960s through highway construction.Colorado DOTCDOT says the process for demolishing the bridge will be similar to that used by the Washington State Department of Transportation to demolish the Alaska Road Bridge, from While seeking to prevent damage to the environment and nearby buildings and homes, acoustic grilles and curtains are installed along property lines, and air monitors are used to ensure dust remains within OSHA guidelines, according to the agency.Water will be sprayed to keep dust levels low, CDOT says, and will be used Screens to keep noise within permissible limits.Vibration monitors will ensure that demolition activities do not exceed three baseline vibration.“The demolition process will also carry out the removal of polluting materials to break down the materials that It cannot be reused elsewhere and disposed of properly.” The Kiewit Meridiam Partners team is the contractor on the project. Kiewit was also the contractor for the demolition of the Alaskan Way Viaduct. The current highway configuration is expected to be in place for 18 months until the other six lanes are built. The entire project will be completed in late 2022, according to CDOT. Check out a CDOT video of an overhead animation of a future I-70 reconstructed section:


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