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2016SummerShotcreteEMag

New Products & Processes sure from the chamber pushes the piston down. Minimum valuable air is consumed, contributing to the high efficiency of the stroke mechanism. To learn more about the RTEX breakers, visit www. atlascopco.us/usus/products/demolition-equipment/ product/3590230. Schwing Adds Tier IV Engine: SP 500 Stationary Pump Schwing is now providing their popular SP 500 stationary concrete pump with a Tier IV-compliant Caterpillar diesel engine. This is a response to government-mandated reductions in harmful exhaust gases from diesel-powered equipment. The California Air Resource Board (CARB) requires Tier IV compliance for stationary pumps used on public and private projects. Other parts of the country are also requiring Tier IV compliance depending on the locale and project. The CAT® C3.4B diesel is rated at 74.5 hp while providing durability and fuel efficiency. Customers will enjoy unprecedented global parts, service, and repair options through the CAT dealer network. The SP 500 is a versatile machine with up to 45 yd3/h (34 m3/h) output and 1100 psi (8 MPa) maximum pressure on the material. The machine excels in pumping grout, shotcrete, or concrete. The twin-cylinder, all-hydraulic pump handles up to 1.5 in. (38 mm) aggregate with its 6 in. (152 mm) diameter pumping cylinders operating through a 39 in. (991 mm) stroke. Sequencing the concrete to the pumping cylinders is the Rock Valve that enjoys proven reliability on Schwing’s largest concrete pumps. Besides pumping harsh mixtures, the Rock Valve cleans up faster using less water for high use on multiple projects in a day. Dual-shifting cylinders provide positive valve actuation for smooth discharge. The open loop hydraulic system combines with the CAT engine to provide all-day economy from the 20 gal. (76 L) fuel tank. Schwing SP models can be provided as skid, truck, or trailermounted units. A convenient control panel on the side of the machine includes switches for on/off, forward/reverse, and hopper agitator. Electric power is also available. A cable remote is standard with optional radio remote control. For more information on the Tier IV compliant SP 500 and the entire line of Schwing stationary pumps, visit www. schwing.com. Atlas Copco New RTEX Pneumatic Breaker Focuses on Big Power with Less Airflow and Fewer Vibrations Atlas Copco’s new RTEX pneumatic breaker offers rental centers and contractors a cost-effective and powerful solution for a variety of demolition projects. The RTEX requires just 37 cfm to operate—about 50% less air energy than conventional breakers in the same weight class. This gives contractors the option to run multiple breakers off of a compact air compressor, resulting in greater efficiency and a high return on investment. “Contractors will notice the RTEX difference after one use. Since the RTEX air consumption is essentially cut in half, contractors are able to run two 60 lb (27 kg) RTEX breakers off a 90 cfm compressor,” said Gus Armbruster, Atlas Copco Handheld Construction Tools product manager. “This not only saves on rental or ownership costs on a small compressor but also on fuel consumption without sacrificing breaking power.” The RTEX has the breaking capacity of a 66 lb (30 kg) breaker or greater, but weighs only 55 lb (25 kg). Its Sofstart™ two-step trigger lets the operator start the breaker slowly for full control over the chisel’s starting position and placement. The RTEX operates with a constant pressure control that features improved energy transfer from the breaker to the new RHEX power chisel. The RHEX chisel generates a powerful breaking force and features a concave tip profile to significantly reduce jamming and promote operator productivity. The constant pressure chamber sits at the top of the breaker and serves as an advanced pneumatic suspension, which minimizes vibrations. Because the constant pressure chamber sits at the top of the breaker, there is no need for ergonomic handles— vibration values are comparable to a conventional breaker with flexible and vibration-reducing handles. This enhances operator comfort and allows the operator to work as much as eight times longer than with conventional breakers. The breaker’s minimal vibrations also minimize stress on its internal components, which means fewer spare parts replacements and less maintenance. The RTEX features a long piston design that delivers double the interaction time—100 milliseconds—of the tool with the surface than conventional pistons. This results in higher impact energy per blow and faster results than what can be achieved with conventional breakers in the 60 lb (27 kg) weight class. In a conventional breaker, air discharges each time the acting piston moves up or down. In the RTEX breaker, the air discharges only once—on the piston’s return stroke, in which the constant pres 76 Shotcrete • Summer 2016


2016SummerShotcreteEMag
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