Tunnel Business Magazine

OCT 2018

TBM: Tunnel Business Magazine is the market leader for North America. TBM is written for leading professionals in all aspects of tunneling and covers project stories, design elements, contracting strategies, legal issues, new technology and more.

Issue link: http://digital.tunnelingonline.com/i/1042145

Contents of this Issue


Page 38 of 47

excavation and bracing are about 70% complete, moving north to south. In the northern area HDPE gas/water proofing has started. The Flower Street tunnel will tie into the existing 7th Stre o Center Station. • Structural concrete on the Gold Line "Y" connection at 1st Street and Almeida will begin in early 2019. The Regional Connector is a Design/Build Project. The final design is approximately 99% complete, and the construction is approximately 51% complete, as of September 2018. Other parties affiliated with the project – Tunnel Designer for the Contr Consultant: Ar er: Herrenkecht. Preliminary design was completed by CP o performing design services during construction. Key Project Personnel – o Project Executives: Gary Baker, Proje t o Design Consultants: ill Hansmire, Tunnel D o cadis), Dominic Cerulli, Sr Proje oadway Sta avern Resident Engineer; Contractor Project Executives (Regional Connector Contractors RCC): (Skanska) e Aparicio, e Smithson; (Traylor) agard. Los Angeles Westside Purple Line Extension Project - Section 1 Skanska/Traylor/Shea JV The Westside Purple Line Extension Project is a 9-mile long project that consists of three sections that are being planned to be built and opened for revenue service before the end of the next decade. Section 1 is a 3.92-mile long subway alignment with three stations that is being constructed under Wilshire Boulevard in gassy ground and tar sands with prehistoric fossil deposits utilizing the design-build delivery metho TP for the $1.636 million design- build contract was issued on Jan. 12, 2015. Tunneling operations are planned to begin in October 2018. The tunneling operations will be staged through the shoring box of the Wilshire/La Brea Station excavation. The Revenue Service Date per the Full Funding Grant Agreement is Oct. 31, 2024. The scope of work includes 17,900 ft of twin-bore tunnel: Reach 1 is 9,600 lf between Wilshire/La Brea Station and Wilshire/Western etrieval shaft; Reach 2 is 4,400 lf between Wilshire/La Brea and Wilshire/Fairfax Stations; and Reach 3 is 3,300 lf between Wilshire/ Fairfax and Wilshire/La Cienega Stations. There is also 600 lf of tail track to the west of Wilshire/ La Cienega Station where e buried. The tunnel is 18-ft, 10-in. inside diameter with 12-in. thick precast concrete lining. Depth varies from 40 ft and 100 ft. The alignment includes three stations and the western retrieval shaft and 23 cross passages. Tunnels are planned to be mined by two Herrenkne oss-passages are planned to be mined by the sequential excavation method using variety of localized ground support systems. Anticipated ground conditions include: Soft ground consisting of Pleistocene-age (San-Pedro) and Pliocene-age (Fernando) formations; Some alluvium deposits and artificial fill areas above the tunnel; Tar sands comprise almost 25% of tunnel alignment; Expected water table up to 90 lf above tunnel crown; Presence of methane (CH4) and hydrogen sulfide (H2S) gases (tunnels are deemed "gassy" by OSHA). The project is 35% complete. Production of tunnel precast concrete liners began completed in er Herrenknecht has completed ere outing of cross-passages is c embly started in July 2018, and expected launch is Octob ected to progress through July 2020. Tunnel Designer: PTG/ or STS JV); Construction c/Jacobs Engineering/ Subcontractors – er: Herrenknecht; Precast: Traylor precast; Support of Excavation/piles: Condon Johnson; Jet Grou olm Drilling; Geotechnical instrumentation: Group Delta; Gas Geotech: Golder; Dewa etrench; Standpipe: en. Key Project Personnel: James Cohen, Executive Officer, Program A; Ashok Kothari, Project Director, WSP; e Smithson; (Tray uart, Jim Honeycutt. CONNECTICUT North Branford Great Hill Tunnel and Pipeline Restoration Project Merco Inc. co Inc. receive TP in January 2018 and completed this project for the South Central Connecticut Regional Water Authority in April 2018. The project involved the rehabilitation of an existing 6-ft by 3,000-lf concrete lined raw water tunnel and downstream 48-in. cast iron pipeline. The tunnel was dewatered and tunnel access was accomplished through the existing 48-in. pipeline. Upon completion of temporary utility installation, the tunnel was cleaned and scaled. Selective demolition was performed on defective areas of the tunnel. Ground support included rock 3 9 TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // OCTOBER 2018 T U N N E L U P D AT E S

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