Providing a nonstop journey through Downtown Los Angeles, the 1.9-mile-long Regional Connector light-rail extension project features three new underground stations that vary from 40 – 112 ft in depth. Construction of one of the stations also includes extensive underpinning and relocation of a large storm drain facility.
The team utilized an earth pressure balanced (EPB) tunnel boring machine for the two twin-bored tunnels, 22 ft in diameter, with precast concrete segmental lining. They also dug more than 3,700 ft of cut-and-cover tunnel construction in LA’s highly congested financial district. The cut-and-cover section and the three stations were constructed during 55-hour weekend closures and with the use of temporary traffic decking.