Tunnel Business Magazine

JUN 2018

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Page 44 of 51

TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // JUNE 2018 T U N N E L U P D A T E S 4 5 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 Tun- nel Connector alignment. After successfully mining the Lower Pogues Run tunnel, backed up and successfully relaunched within the White River T y 2017, mining of the White River Tun- nel alignment has extended a total of approximately 12,000 ft. Based on the terms of a federal consent decree, the White River and Lower Pogues Run tunnels must be operational by the end of 2021. Key Project Personnel .E.; As- sistant Proje oject Engineer: Percy Towns - ager: Kyle Shickles; Equipment Superintendent: Keith Walter; Field En- gineers: Eric Haacke, Zack Heinrich, Kendall G Engen. Inspe ain, P Gr , P.E.; Supervisor Special Projects: Tim Shutters; Construction Supervis MARYLAND Baltimore CSX Transportation Howard Street Tunnel, Camden Street Drain Re- placement Bradshaw Construction Corp. Bradshaw has begun work on a project in a high-profile area of down- town as the tunnel contractor working with Clark Construction's design- build team. An existing storm drain is currently located in the invert of the CSX Transportation Howard Street Tunnel and is the cause of fre- quent flooding. This project will replace that 48-in. storm drain with a larger, deeper siphon drain which will eliminate the flooding and eventu- ally allow for CSX to increase the size of the existing tunnel to gain freight capacity through the area. A total of three tunnels will be mined out of a 55-ft deep shaft at the intersection of Camden Street and Howard Street, in the shadow of Oriole Park at Camden Yards. From the 26-ft diameter shaft, three tunnels will be mined, all starting at different elevations. The first is the Upper Adit Tunnel, 32 ft of 66-in. liner plate, hand-mined tunnel for a 48-in. FRP storm drain. The Upper Adit will connect to the existing storm drain being replaced, bringing those flows back to the Camden Street Shaft. This tunnel in currently be- ing constructed. The second tunnel is 68 ft of 48-in. liner plate, hand-mined tunnel for 18-in. PVC pipe, which will ultimately serve as the drain for the Howard Street Tunnel. The Lower Tunnel consists of a two-pass microtunnel of 73.5-in. steel casing for a 60-in. FRP storm drain. The tunnel will go 122 ft under Howard Street and finish at the footing of the Convention Center and will be the siphon that will reconnect to the existing storm network. Subsurface conditions are expected to be poorly graded sand with silt and gravel and will require extensive grouting prior to tunnel excavation. In- formation: Todd Brown, Proje own@bradshawcc.com. MISSOURI St. Joseph Black Snake Creek Stormwater Separation Improvement Project – Tunnel Package Super Excavators Inc. The work for this $26.991 million project for the City of St. Joseph De- partment of Public Works generally consists of the construction of 90-in. diameter concrete precast segment lined 6,648-ft long tunnel, 37-ft diam- eter baffle drop shaft, 48 ft of near surface reinforced concrete box cul- vert, 2-ft diameter vent shaft, 181 ft of 90-in. diameter open-cut steel pipe installation, 125 ft of 90-in. jacked steel pipe, an energy dissipation struc- ture, site restoration, and performance of other associated works. Factory acceptance testing on the L omplete, and the machine is in transportation from China. Crews are in the process of finalizing the tunneling site to receiv or onsite assembly. Tun- neling is expected to commence in early June. The concrete work for the energy dissipation structure is being completed, along with steel sheeting removal and final grading to reach the intermediate milestone (October 2018). The secant receiving shaft (drop shaft) is currently under construc- tion, and once complete, excavation will begin along with box culvert in- stallation for the tie in work. This is the first EPB machine provided by Lovsuns in the United States. The tunnel segments are being manufactured utilizing synthetic fibers. This is the time segments have been constructed in this manner in the United States. Parties Affiliated with the Project: Black & Vetch Corporation – En- gineer. L er. Project Personnel: e Garbeth, Senior Proje egg Re- hak, Vice President. NEVADA Las Vegas Lake Mead Low Lake Level Pumping Station (L3PS) Project Barnard of Nevada Inc. (Barnard) y 2015, Barnard entered into a $440 million construction man- ager at risk ( contract with the Sou ada Water Authority for the L3PS Project. The underground work includes: 525-ft deep x 26-ft. diameter access shaft; bulkhead to allow for future expansion; 80-ft deep x 26-ft diameter Riser Shaft to connect to existing Intak onnector tunnel; 33-ft wide x 36-ft high x 400-ft long horseshoe-shaped forebay cavern; forebay connector tunnel; and 34 drilled 8-ft diameter x 500-ft deep pump well shafts with steel-lined 6-ft diameter casings. The above-ground pumping station and accompanying appurtenances include: 32-each 30-mgd submersible pumps; valves and discharge header piping; surge tank, concrete valve vaults, electrical controls and starting equipment for the pumps; electrical control building; electrical feed from an onsite substation; and 5,550 lf of 144-in. discharge aqueducts for con- necting the new pumping station to the existing water treatment plants. To date, crews have completed the 500-ft excavation and concrete lin- ing of the access shaft, the 60-ft connector tunnel and riser shaft (winze shaft) and all 34-each 500-ft deep x 6-ft diameter well casings, and excava- tion and lining of the forebay cavern tunnel.

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