Tunnel Business Magazine

APR 2018

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TUNNELINGONLINE.COM C O V E R S T O RY 1 6 TBM: TUNNEL BUSINESS MAGAZINE // APRIL 2018 CRENSHAW/LAX Crenshaw/LAX was the first of the latest wave of projects with under- ground components to move forward. Crenshaw/LAX, with an overall bud- get of just over $2 billion, is an 8.5-mile light-rail line with eight stations that will run between the Expo Line on Exposition Boulev o Gre TP was issued in Septem- ber 2013 with revenue service expected by fall 2019. The project includes twin bore tun- nels, about 1-mile long each, connecting three underground stations. The tunnel is 21-ft OD (19-ft ID) and is approximate- ly 70 ft below ground. Ground condi- tions are soft ground/alluvial, leading to the choic The main construction contract was awarded to Walsh/Shea Corridor Con- structors, a joint venture comprising Walsh Construction and J.F. Shea Co. Overall the project is 80 percent complete with all tunneling complete. Current con- struction activities include a tie-in to the Green Line and heavy civil construction for the underground stations. Systems, and trackwork have begun, and infill work on the stations to follow. Included as part of the overall proj- ect is the Southwestern Yard project, a $170 million operations and main- tenance facility being constructed by Hensel Phelps/Herzog JV. The South- western Yard is designed, constructed and equipped to perform service and inspection, heavy repairs, blow-down, body repairs, painting, storage, clean- ing, and washing of light-rail vehicles (LR o fleet; as well as facili- ties for general administration, mainte- nance and storage. Completion of the yard, which is integral to the operation of the new Crenshaw/LAX line, is an- ticipated in late 2018. Hensel Phelps/ Herzog JV also constructed three piles and columns for a future Automated Pe er project by Los Angeles World Airports (LAWA) that will con- nect Los Angeles International Airport (LAX) with the Crenshaw/LAX line. Ridership along the corridor is pro- jected at 31,000 daily boardings by 2035. Future plans include extending the line north to connect with the Purple Line and ultimately the Red Line. REGIONAL CONNECTOR The 1.9-mile Regional Connector is a key project linking four distinct lines and creating a one-seat ride north-south from Azusa to Long Beach and east- west from East Los Angeles to Santa egional Connector is a game-changer for the transportation system," Pennington said. "It forms a north-south/east-west backbone and connects to the rest of the system in a number of different places, including Union Station. Anyone traveling to or through downtown Los Angeles will be able to save about 20 minutes off their commute. It is a huge benefit." The $1.75 billion project was awarded to Regional Connector Constructors, a joint venture comprising Skanska and Traylor Bros., in 2014. The tunnel depth ranges from 25 ft to approximately 120 ft and crosses b o Red Line heavy rail tunnels with less than 7 ft of clearance. The Regional Connector includes approximately 2,100 ft of cut-and-cover and retained cut guideway, a 300-ft crossover cav- ern, and three cut-and-cover subway stations. The crossover cav o's first experienc The project is approaching the 50 per- cent completion mark over tunneling has been completed, with the final hole through occurring in Decem- ber 2017. Since completion of tunnel- ing, crews have turned their attention to station work. In addition, crews are in the process of performing underpin- ning work for the Los Angeles Times building from within the excavation at 2 nd /Broadway. The Purple Line Extension comprises 9 miles of twin bore tunnel section that will extend the existing line at its terminus at Wilshire/Western westward through Beverly Hills and into West Los Angeles.

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