Tunnel Business Magazine

OCT 2018

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4 0 TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // OCTOBER 2018 bolts and shotcr cts were repaired with pre-packaged repair mortar, and major liner defects were repaired with shotcrete. Extensive liner probing and grout hole drilling was performed and the entire tunnel was pressure grouted to fill voids and strengthen the existing liner. A chemical grouting program was performed to reduce water seepage from the liner. The existing 48-in. pipeline was sliplined with Hobas pipe. Fully automated waste water control system was used for the tunnel cleaning and tunnel grouting operations. Due to the restricted access to the tunnel, the grouting operations were located on the surface and discharged through a continuous grouting system for the full length of tunnel. Total grouting distance including return line was over 6,000 lf. Project Personnel: Regional Water Authority – Rose Gavrilovic, P.E.; Larry cik, P obs – Joe Schrank, P.E., Brian Lakin, P Remsco – Richard Palmer, P co – Eric Seib, Proje a Project Sup , Assistant Superintendent. DISTRICT OF COLUMBIA Washington Northeast Boundary Tunnel Salini Impregilo Healy This is a combined sewer overflow (CSO) tunnel 26,737 ft long with a 23-ft finished diameter (26-ft, 3-in. excavated diameter). The tunnel is being driven using an EPB in heavy clay and water bearing clayey sands at water pressures up to 3 bar. The $579.9 million project for DC Water includes construction of seven slurry wall shafts up to 130 ft deep in a dense urban environment. Ground freezing was used at two shafts to connect shaft to tunnel. Jet grouting was used at other shafts to connect shaft to tunnel. Extensive instrumentation is being used to track performanc egards to settlement. d on Aug. 17 from the ews have started shaft slurry wall construction at two shafts and are starting to mobilize for the third shaft. Construction of East Side 48-in. Force ersion is underway to allow extraction of steel piles that penetrate to tunnel horizon. unnel is part of a $2.7 billion program by DC Water to mitigate CSO discharges into the Anacostia and Potomac Rivers and bring flood relief to northeastern Washington, D.C. The tunnel is a challenging alignment with 15 curves, shaft entry and exit, and only one shaft online in 26,737 ft to check uck removal is being done by conveyor belt in the tunnel and by a 17 cubic yard clamshell at the shaft. The tunnel and all associated structures have a 100-year design life. The work environment for the shaft construction along Rhode Island Avenue is challenging with small shaft sites combined with urban residential neighborhoods and a high traffic corridor. DC Water and SIH are making extensive community outreach efforts. The tunnel and all shaft support are designed by SIH while the remaining permanent structures are designed by DC Water. Parties Affiliated with the Project: Designer: Brierley Associates; Supplier: Herrenknecht; Slurry Walls, Jet Grout, Secant Piles, Solider Piles: Treviicos; Segmental Tunnel Liner Supplier: uck Hauling: Bulldog Construction; Instrumentation: Entech; Traffic Engineering and Instrumentation Installa EPC Consultants; DC Clean Rivers Program obs and Greeley & Hansen. Project Personnel: Proje Shane Yanagisawa; Deputy Project Flaviano Solesin; Safety erry Stiles; QC/Q unzer; Engine Pietr Cadoni; Plant & Eq Alessandro Feliziani; D Pietro Banov; Brierley Associates Design emiah Jezerski; Resident Engineer: Scott Shylanski. Information: John Kennedy, Sr. V.P., 702-524-0438 . ILLINOIS McCook McCook Reservoir Des Plaines InflowTunnel Walsh Construction This $107.7 million project for the opolitan Water Resources District ) includes approximately 5,800 ft of 20-ft ID tunnel with two shafts (one permanent and one for construction to be abandoned at completion of work). Entire tunnel is in dolomite limestone and is being constructed via drill-and-blast methods. Tunneling is nearing completion and lining has begun. The tunnel has two live connections, one on each end. On one end it will connect 's existing Des Plaines Tunnel system and on the other it will connect to the liv ok Reservoir, which was placed in service in December t down either the tunnel or the reservoir to accommodate the connections so all work will be heavily weather dependent. TP was issued on July 9, 2016. Completion is scheduled by Jan. 23, 2020. The designer is Black & Veatch. Key Project Personnel – Kevin Fitzpatrick, Carmen Scalise, Patrick Jens ary Hirner. INDIANA Indianapolis White River Tunnel, Lower Pogues Run Tunnel Shea-Kiewit JV The White River Tunnel is a 30,600- ft, 20-ft, 2-in. diameter bored tunnel with an 18-ft finished concrete lining (approximately 250 ft deep). There are two bifurcations in the final alignment and seven CSO connecting structures/ deaeration chambers and adits. The Lower Pogues Run Tunnel is a 10,200-ft, 20-ft, 2-in. bored tunnel with an 18-ft finished concrete lining, which bifurcates from the White River Tunnel alignment, and includes two CSO connecting structures/ deaeration chambers and adits. The work is for Citizens Energy Group's DigIndy project, which is a CSO reduction program including six deep rock tunnels totaling over 28 miles. ommenced in September 2016 from a 35-ft diameter shaft that was previously constructed as the retrieval shaft for the Deep Rock Tunnel Connector alignment. After successfully mining the T U N N E L U P D AT E S DC Water Northeast Boundary Tunnel

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