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A creative fish passage system allows migratory fish to overcome a 30-foot-high dam and reach an upstream watershed. Challenged by a remote, high-mountain location, the project team design solution included 59 precast concrete vortex weirs placed along 400 feet along the dam spillway. Each 27,000-pound weir allowed fish to ascend the steep grade from the natural channel below to the reservoir above, then on to high mountain waters. Success was realized the next summer when steelhead nests appeared above the dam for the first time in a century.
Accelerated bridge construction methods helped create a major new NW 50th Street crossing and nearby BNSF rail bridge, while minimizing disruption to commuter rail traffic. Installation of the highway bridge was completed in a single three-day weekend, while the rail bridge took less than a day. The expedited construction process project significantly improved safety for motorists and worker motorists, who did not have to contend with months of lane closures.
Imaginative engineering produced a new eye-catching new bridge that improves area neighborhood connectivity. Inspired by the city’s motto: “industry fills the hive and enjoys the honey” the new Beehive Bridge sports curved panels in shades of translucent orange to resemble a giant honeycomb and a bumblebee’s flight. Sunlight through bridge panels creates changing patterns on the streetscape. Glowing LED lighting showcases the structure at night.
The new state-of-the-art solid-waste facility features innovative processing that efficiently containerizes municipal solid waste for transfer to landfills via barges. Maximizing efficiency and safety, the 85,000-square-foot facility has a top-floor tipping level for truck unloading, and a loading level for compressing and loading solid waste through open floor slots. The new facility reduces tractor-trailer traffic, its carbon footprint, and enhances environmental safety.
Numerous hazards for nearly 100,000 daily motorists have been diminished by replacing an existing steel structure over East 127th Street with two new parallel prestressed concrete girder viaducts. Adding a left lane exit for southbound traffic and flattening the bridge’s vertical curve improves sight distances for stopping and helps correct other longstanding and dangerous conditions which contributed to high accident rates.
Creative structural modeling helped transform an underused city block into a fully developable site for Seattle’s second-tallest building. The new building and its seven?level garage were to be built immediately adjacent to the 40-year-old Rainier Tower. A quarter of the site’s soil had to be replaced with a temporary shoring system to preserve stability and structural integrity as excavation extended 50 feet deeper than the nearby tower’s shallow foundation. The old building remained safe and fully occupied with no perceptible lean or settlement.
The project team helped lead development of a $1.45 billion project aimed at improving New York City’s ability to withstand and recover from a major storm. The project targets a 2.4-mile stretch along Manhattan’s East Side. It addresses at-risk critical structures such as major pump and electrical stations, and more than 1,500 buildings. An integrated flood protection system features floodwalls and floodgates.
To provide the city with long-term, reliable potable water supply, the project team developed a five-prong solution that includes dual pumping, focused treatment, irrigation reuse and management, blending and storage, and aquifer storage and recovery. The plan addresses increasing levels of nitrate and uranium contamination, as well as options for treatment and disposal. This approach substantially reduces operation costs while providing long-term protection for the aquifer.
Dynamic engineering is on display at the new headquarters for one of the world’s leading engineering firms. The 10-story, 240,000-square-foot structure features an imaginative façade with an its form sliced at the corners to maximize space on upper floors. The building also contains a highly integrated system of temperature and lighting controls to reduce energy consumption. An underground chamber detention system captures and treats storm water runoff prior to entering the city’s collection system.
Nicknamed the St. Louis’ “big slide,” the project team used specialized equipment to lift a 2,165-foot-long, 20.4-million-pound eastbound bridge, and moved it nine feet south along its support pier—setting a record for the longest existing bridge and heaviest overall bridge relocation in the U.S. Completed as part of a major interchange overhaul, the project solved a host of design and maintenance challenges, while improving safety and vehicle capacity.
A new 2.8-mile bridge spans one of the most dangerous channels on the Atlantic Coast, replacing a 1960s-era bridge which required near-continuous repair, and provides safer access for thousands of visitors to the Outer Banks’ famed beaches. The project team created simulations of more than 100,000 storms dating back 160 years to develop a foundation and structural support system capable of withstanding Oregon Inlet’s powerful, ever-shifting currents for the next 100 years.
The new swing bridge replaces its outdated 1928-era, single-track bridge version. The new swing span is metalized to combat common high storm surges of brackish. It also is hydraulically driven with enclosed motors and features a center-pivot service tower to keep most equipment elevated above any flood levels. The new swing bridge was installed within a 15-hour outage window to keep rail operations on schedule.
A first-of-its-kind, multi-state regional Truck Parking Information Management System (TPMIS), helps long-haul truck drivers find safe locations to park. An elaborate system uses detection technology to identify available spots at state-operated rest stops and parking facilities. Real-time information is then relayed to truck drivers via roadside message signs, in-cab systems, and mobile applications. The new system already is deployed at 18 truck parking sites along I-70 from Topeka to the Colorado state line.
Innovative foundation design now supports a new 17-acre campus featuring new mid-rise academic and research buildings. The site required interconnected below-grade space and deep excavation below the groundwater table for multiple basement levels, a central energy plant, and bridge structures to support local streets. Multiple foundation types in a phased construction approach, included a rare top-down construction approach which allowed structures to rise during excavation below.
Imaginative engineering created an elegant new performance center where concert, recital, and rehearsal halls are three separate buildings within one large overall structure. Each hall features state-of-the art acoustics and sound isolation, not only from nearby traffic or lobby noise, but from music emanating from adjacent halls. Interior walls are lined with an acoustical coffer system to enhance superior sound treatment.
In response to repeated major flooding that crippled several Big Sioux River communities in recent years, a new state-of-the-art flood information system now system helps decision-makers, emergency managers, weather service providers, effectively plan appropriate flood mitigation responses. The system is a one-stop web platform for real-time stream conditions, flood forecasts, visualizations, and inundation maps. Detailed computer models can simulate weather and watershed conditions across the entire basin from 2-year to 500-year events.
Innovative mechanical system design provides assures patron comfort and an outside noise-free experience at this unique 900-seat theater-in-the-round venue. An innovative, first-of-its-kind displacement ventilation system assures indoor comfort. Large air handlers are enclosed in heavy concrete and located on the roof above the lobby rather than the theater to enhance a noise-free theater environment.
Two major treatment facilities were connected by a new 3-mile-long, 10-foot-diameter, fiberglass-lined sewer tunnel, making it the state’s longest conveyance pipeline. In addition to moving wastewater by gravity, the pipeline can store up to nine million gallons of wastewater during wet-weather events, which prevents accidental discharges of untreated sewage into the environment.
Constructed above the new No. 7 Subway extension line and a recently built Amtrak tunnel, the eye-catching, super-slender 918-foot-tall condominium skyscraper is supported by groundbreaking structural design. To sculpt the building’s unique curved massing, the project team used systems of surreptitious stepping and sloping columns with structural transfers dispersed throughout the height of the tower. A double story tuned slosh damper keeps the tower stable in high winds.
The project team applied accelerated bridge construction (ABC) techniques to expedite the replacement of the aging superstructure in Seven Corners, one of Northern Virginia’s busiest and most complicated intersections. Rather than staging months-long lane closures that would have crippled traffic in the area, the replacement superstructure was constructed adjacent to the existing bridge. Over a 54-hour weekend closure, the old bridge was demolished, and the new section put in place well in advance of the start of the following Monday morning rush hour.
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