Tunnel Business Magazine

FEB 2018

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Page 34 of 43

TUNNELINGONLINE.COM T U N N E L U P D A T E S 3 5 TBM: TUNNEL BUSINESS MAGAZINE // FEBRUARY 2018 CALIFORNIA Los Angeles Crenshaw/LAX Walsh/Shea Corridor Constructors This $1.278 billion project for the Los An- geles opolitan Transportation Author- o), being built by a joint venture of Walsh and Shea, is an 8.5-mile light-rail line that will run between the Expo Line on Ex- position Boulev o Green Line. TP was issued in September 2013 with rev- enue service expected by October 2019. The project consists of twin bore tunnels, about 1-mile long each, connecting three un- derground stations. The tunnel is 21-ft OD (19-ft ID) and is approximately 70 ft below ground. Ground conditions are soft ground/ alluvial, leading to the choic Construction of the concrete inverts and emergency walkways in both tunnels are complete, as is final concrete lining of all five cross passages. The primary activities remain- ing to be completed in the tunnels are the construction of the trackwork and concrete plinths throughout, and final outfitting/instal- lation of mechanical and electrical systems. Parties affiliated with the project: er – Herrenknecht (Germany); TB; Construction Support Services: Stantec; Tunnel Engineering: Arup; Systems: L.K. Comstock; Structural Engineer- ing: SC Solutions; Community Outreach: Los Angeles Urban League; Civil Engineering: Jenkins/G Electric; Quality Control: QEI; Survey: Psomas. Key Project Personnel – Deputy Executive Officer, Project Director (Metro): Charles H. Beauvoir; Interim DEO, Deputy Project Director o): Kimb o): Dana Rogers; Proje ardner; Deputy Proje ve Preston; Con- arl Christensen. Los Angeles Purple Line Extension – Phase 1 Skanska/Traylor Bros./J.F. Shea JV (STS) 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/West- etrieval shaft; Reach 2 is 4,400 lf between Wilshire/La Brea and Wilshire/Fair- fax 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 the e buried. The tunnel is 18-ft, 10-in. inside diameter with 12-in. thick precast con- crete 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 Her- renkne oss-passages are planned to be mined by the sequential excavation meth- od 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 proj- ect is 15% complete. Production of tunnel precast concrete Lin- ers b emb - turer Herrenknecht has completed manufac- tur tests were successfully conducted at the Her- renknecht factory in July. Delivery to LA is schedule ember. Jet grouting of cross- passages b ember 2016. Wilshire/ La Brea Station excavation (tunnel launch point) began in July 2016. Tunnel Designer: PTG/ or STS JV); Con- c/Jacobs). Engineering/AECOM); Major Subcontrac- tors – TBM Manufacturer: Herrenknecht; Precast: Traylor precast; Support of Excava- tion/piles: Condon Johnson; Jet Grouting: olm Drilling; Geotechnical instrumenta- tion: Group Delta; Dewa etrench; Standpip en. Key Project Personnel: James Cohen, Ex- ecutive Officer, Progr - A; Ashok Kothari, Project Director, WSP/ Parsons Brinckerhof e Apari- e Smithson; (Tray uart, Jim Honeycutt. Los Angeles Purple Line Extension – Phase 2 Tutor Perini/O&G JV The L opolitan Transportation Au o) Board of Di- rectors on Jan. 26, 2017, awarded a $1.37-bil- lion contract to the joint venture team of Tu- tor Perini/O & G to build the second section o Purple Line Extension Project to Century City. The Board also established a budget of $2.4 billion for the project. Completion of the second subway section is anticipated no later than 2026. The second section will add another 2.6 miles to the Pur- ple Line with one station at Wilshire/Rodeo in downtown Beverly Hills and a station in the heart of Century City. Los Angeles Regional Connector Transit Project Regional Connector Constructors (Skanska- Traylor JV) The tunneling portion of the $1.75 billion Regional Connector Transit Project for the Los opolitan Transportation Authority involves 5,795 ft of twin tunnels with an excavate TP was issued July 7, 2014 with a forecast completion date of December 2021. The ground condi- tions range from alluvium soils to siltstone of the Fernando formation, with the poten- tial for methane, hydrogen sulfide gas, and boulders. The groundwater table is generally above the tunnel alignment. Pressure balance tunneling u equired, along with precast concrete segments with double gaskets as the tunnel lining system. The tunnel depth (cover) ranges from 25 ft to approximately 120 ft and crosses below the 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 cavern excavate techniques, and three cut-and-cover subway stations. The bored tunnels will be excavated concurrently with the three station construc- tion, requiring coordination of cut-and-cover and tunnel excavation. The Little Tokyo/Arts District Station, locat- ed at 1st St & Alameda St, excavation and invert concrete was completed in December 2016 and ommenced in February 2017, and the first tunnel was completed on July 19, ed and relaunched on Sept. 26, 2017, at the 1st St & Alameda St sta- tion box for excavation of the second drive of which 4,743 ft has been excavated through De . 7, 2017, the tunneling crews set a tunnel production record of 190 ft in one 24-hour day. The second bore suc- cessfully crossed underneath the existing Red Line tunnels under Hill Stre relaunched in the Grand Av Arts/Bunker Hill Station and is currently completing the last 1,000 ft of tunnel drive to the Flower Street cut-and-cover section wher expected to be demobilized in mid-January 2018. The excavation of the 90-ft deep Historic Broadway Station, located at 2nd St and Broad- way, is approximately 60% complete waiting on the completion of the second tunnel drive. Other parties affiliated with the project – Tunnel Designer for the Contr - Consultant: Ar er: Her- renkecht. Preliminary design was completed by CP o per- forming design services during construction. Key Project Personnel – o Project Ex- ecutives: Gary Baker, Proje Harrington, Engine t An- o Design ill Hansmire, Tunnel D o Construction cadis), Patrick Jolly, on Drake, Technical Advisor/Tunnel Resident Engineer; Contractor Project Executives (Regional Connector Con- tractors R e Smithson; (Tray agard. CONNECTICUT Hartford South Hartford Conveyance and Storage Tunnel (SHCST) Kenny/Obayashi This $299.4 million contract for Hartford onstruction of an 18-ft finished (lined) diameter tunnel 21,800 ft in length in deep rock (~200 ft deep), launch shaft and retrieval shaft, as well as pump station excavation shaft, drop shafts, adits, de-aeration chambers and odor control at po- tential release points. The launch shaft is to be excavated at 38 ft diameter, the retrieval shaft at 33 ft diameter, and the pump station shaft at 74 ft diameter. The drop shaft diameters vary from 42 to 72 in. The tunnel is expected to be opera enknecht; En- gine

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