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2016SpringShotcreteEMag

Corporate Member Profile Fig. 3: Steady output with minimal surging makes for fatigue-free hose work thanks to the fast sequencing valve of the Schwing shotcrete pumps Fig. 4: Schwing stationary pumps can be truck or trailer mounted with CAT Diesel or electric power Fig. 5: The SP 500 is available with a Tier IV CAT diesel for low emissions operation in California Schwing America Inc. 5900 Centerville Road St. Paul, MN 55127 (651) 429-0999 E-mail: jmcalister@schwing.com Website: www.schwing.com mixture. This very coarse shotcrete mixture helped provide 4000-plus psi (28 MPa) strength at 3 in. (75 mm) slump. The SP 750-15 pump’s 70 yd3/h (54 m3/h) output and 100 hp, combined with its 1100 psi (7.6 MPa) pressure on the shotcrete mixture to pump every day for 2 weeks, allowed for the project completion without an incident. • Niagara Tunnel project shotcreting was part of the excavation contract to stabilize the borehole perimeter but additional shotcrete was required to fill voids in loose soil conditions. The company used three Schwing SP 500 split units to apply the shotcrete 5 in. (130 mm) thick through handheld hoses and shotcrete robotic arms attached to the tunnel boring machine. The wet shotcrete was applied over reinforcing mats anchored into the tunnel walls. The shotcrete arms provided extra reach to fill voids that occurred when soil conditions were not ideal. A Schwing SP 1000 was used to feed the robotic arm and to provide additional velocity to the shotcrete. Trucks supplied the premixed shotcrete to the electrically powered pumps. More than 160,000 yd3 (120,000 m3) of shotcrete was applied over the 5 years of tunneling. Schwing’s Mission Statement of Concrete Solutions to Build Our World has been verified from the top of the Freedom Tower to tunnel projects deep beneath the earth’s surface. With many record-breaking pumping feats around the world for the largest contractors, the company is just as dedicated to the one-pump owner who relies on quality equipment to make a living. Fig. 2: Schwing shotcrete pumps have the capability to provide continuous high-output volume required by big projects like this Olympic swimming pool Shotcrete • Spring 2016 59


2016SpringShotcreteEMag
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