THE CONCRETE BRIDGE MAGAZINE

Summer 2019

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

Issue link: http://www.aspiremagazinebyengineers.com/i/1134112

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F o r n e a r l y 2 0 y e a r s , t h e N e v a d a Department of Transportation has been planning and preparing for the largest and most expensive public works project ever constructed in the state. In the fall of 2015, Project Neon was officially awarded under a design-build contract, and its design phase began shortly thereafter. An important component of Project Neon, the widening and reconstruction of 3.7 miles of Interstate 15 (I-15) between Sahara Avenue and the U.S. Route 95 (U.S. 95) interchange, is currently nearing completion. This stretch of interstate is currently the busiest portion of roadway in Nevada, serving over 300,000 vehicles per day. Geometry for the Project's Signature Bridge Included in this $600 million project is the "signature" high-occupancy vehicle (HOV) connector bridge, an 18-span, 2600-ft-long flyover structure that directly connects the new HOV lanes between U.S. 95 and I-15 in the heart of Las Vegas. The bridge begins and ends on a tangent alignment and completes a greater than 90-degree left-hand turn on an 875 ft radius. The structure's entrance and exit are in the center medians of each arterial, all while crossing I-15, U.S. 95, Martin Luther King (MLK) Boulevard, and several other ramps. Superelevation varies drastically throughout the length of the structure. On the I-15 side, the bridge has a 3% right-down superelevation and quickly makes a full reversal to an 8% left-down superelevation, which is held constant throughout the main portion of the curve. Near U.S. 95, the superelevation transitions again, finishing in a 2% crown over the last several spans. While the bridge superelevation makes a full reversal and crown break, the profile rises from I-15 at a 5% grade before reaching a plateau at a 0.5% slope. Finally, the flyover drops from the sky at a 6% grade to tie back into U.S. 95. profile INTERSTATE 15/U.S. ROUTE 95 HIGH OCCUPANCY VEHICLE CONNECTOR BRIDGE / LAS VEGAS, NEVADA BRIDGE DESIGN ENGINEER: HDR Engineering Inc., Coeur d'Alene, Idaho PRIME CONTRACTOR: Kiewit, Omaha, Neb. PRECASTERS: TPAC, Phoenix, Ariz. (girders) —a PCI-certified producer; Precast Management, Las Vegas, Nev. (precast deck panels) POST-TENSIONING CONTRACTOR: DYWIDAG-Systems International, Long Beach, Calif. DRILLED SHAFT SUPPLIER: Hayward Baker, Hanover, Md. Installation of the reinforcement cage for a 11-ft 6-in.-diameter drilled shaft, located in the median of U.S. Route 95. Shafts were more than 100 ft deep in several locations. Project Neon's signature bridge is the high-occupancy vehicle connector flyover in Las Vegas, Nev. All Photos: Kiewit Corporation. by Daniel Baker and Nick Eggen, HDR Engineering Inc. Flying Over Las Vegas Interstate 15/U.S. Route 95 High-Occupancy Vehicle Connector Bridge 16 | ASPIRE Summer 2019 P R O J E C T

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