Tunnel Business Magazine

OCT 2018

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Page 41 of 47

4 2 TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // OCTOBER 2018 The drop shaft excavation (receiving shaft) is nearly completed with only 20 vf of excavation remaining. This is a 44-ft ID secant shaft with a depth of 60 ft. The EPB first 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. The owner is The City of St. Joseph, Department of Public Works. Black & Veatch is the engineer. e to proceed was issued on July 17, 2017. Scheduled Completion is October 2019. Project Personnel: e Garbeth, Senior Proje egg Rehak, 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 t Risk ( contract for the L3PS Project. To date, crews have completed the 500- ft excavation and concrete lining 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 excavation and lining of the Forebay Cavern tunnel and are nearly complete with the structural concrete for the Access Shaft Bulkhead Structure. Concurrent with the underground construction, the Above-ground Pumping Station work continues with the 108 to 144-in. Discharge piping installation, concrete valve vaults, pumping station base slab construction, and Electrical/ e Building construction. The project has also received and stored the 16 of 32-each, 3,150+HP submersible pumps capa . All work is scheduled to be completed in 2020. 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 Intake 3 connector 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 bmersible 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 connecting the new pumping station to the existing water treatment plants. Design Engineer: Ventur arsons Corp. Project Personnel: A: Peter Jauch, Director of Engine onin, Proje arsons: Kevin Ulrey, ed Davis and Steve Hunt, Lead Engineers; Barnard: Opera , Dan Schall; Project , Jordan Hoover; Project Superintendent: Andy Granger; Underground Sup e Gilbertson; Superintendents, Engineers, and Safety: Tracey Chambers, Tyler Askin, c Cody Cupp, Bowerman, Alex Casilla, Jeff Porter, Klaus Herbert, Bill Kiehl, Jo er, Jake Richardson, Aaron Rustan, Terry Swindle, Peter Turlington, Dan Heroux, , Soctt Evans, Justin Zandt, John Doerr, Kyle Simmons, Le thew Jackson, and Shawn Tezak. NEW YORK Gilboa Schoharie Reservoir Low Level Outlet Southland/Renda JV The first tunnel (1,225-ft land leg drive), which primarily consisted of hard sandstone, is completely excavated with the 108-in ID Permalok pipe set to line/ grade and grouted in place. After retrieval and inspection of the Herrenkne from the portal at the valve chamber, it was determined that an extensive rebuild/repair would be required prior to launching the machine for the water leg drive. The cutterhead was removed and all the internal piping was replaced along with extensive hardfacing, rebuilding of the slurry pumps and other unplanned repairs. The machine has been tested on the surface and was lowered back down the 185-ft deep shaft in September and launched for the 950-ft water leg tunnel. The steel cofferdam is set into place in the bottom of the reservoir and secured with tremie concrete. Tremie concrete was also placed over the top of the alignment where there was marginal cover, and the steel cofferdam was constructed with a fiberglass soft eye so tha be able to bore into the cofferdam and be retrieved in the wet. Once the bores into the retrieval cofferdam, the utilities, trailing gear, and air lock will be unhooked and removed from the tunnel through the shaft. After everything is removed from the tunnel, the temporary bulkheads will be reinstalled in the tunnel, and divers fr Construction will dive approximately 160- ft to disconne onnect rigging for it to be lifted and delivered to shore by crane/barge. Once the water leg tunnel is complete and the Permalok pipe is grouted into place, the elbow, bulkhead, and intake structure will be installed at the bottom of the lake. The valve chamber building deep foundation work is completed. This work consisted of installing 110 caissons and tiedowns ranging in size from 9-5/8 in. to 20 in. drilled to depths of over 100 ft; some on a batter. The large diameter hydrostub and piping has been installed on pipe supports to the extent of the building with the remainder being installed as the building walls are constructed. The valve chamber building construction was set to begin in October and continue through the winter months. The valve chamber building is a three-story cast-in-place building with slabs up to 10-ft thick and walls up to 6-ft thick utilizing colored concrete and an aggressive formliner to match the face of the dam. The hood structure is partially lined with stainless steel plates and baffles at the outlet to the creek. The stream restoration is mostly complete, but won't be finished until access to the valve chamber area (stream side) is no longer necessary. This is due to the overlapping footprint of both operations. The formed RCC steps and the RCC berm armoring has been completed and the majority of the utility armoring is also complete. The RCC berm is being topped with soil and will be stabilized until final restoration is done is 2020. Concrete and gravel roads will also be completed this year along the RCC berm. Preparation for the installation of 15 walers and 33 tiebacks at the o-pile wing walls in the valve chamber area is underway and the tieback work will be completed this year followed by the textured concrete encasement. Following the completion of the tunneling work, the shaft will be concrete lined and sluice gates installed. Additionally, once the marine equipment use retrieval is demobilized, the east overlook construction will begin and once finished serve as a visitor center for the dam. Project Pers Chase; Project Designer (Gannett Fleming/ Hazen Sawyer), Everette Knight; Tunnel Designer (COWI/Jenny Engineering), Leszek Glodkowski; Resident Engineer Julio Diamante; SRJV Project , John Arciszewski; Field T U N N E L U P D AT E S

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