Tunnel Business Magazine

DEC 2018

TBM: Tunnel Business Magazine is the market leader for North America. TBM is written for leading professionals in all aspects of tunneling and covers project stories, design elements, contracting strategies, legal issues, new technology and more.

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TUNNELINGONLINE.COM 2 2 TBM: TUNNEL BUSINESS MAGAZINE // DECEMBER 2018 F E AT U R E S T O R Y Operating a concrete sprayer is one of the most demanding tasks in under- ground mining and tunnel construction, and experienced and skilled operators are becoming more difficult to find. As a result, the quality of sprayed concrete application can vary critically from one operator to another. Equipment manufacturers have been increasingly tasked to develop their products so that variations from opera- tor to operator are minimized, and pro- ductivity and safety are increased. The SmartSpray System fr step toward developing a machine capa- ble of fully automated concrete spraying. Traditional control of a spraying boom means that every boom position is controlled separately by the opera- tor in order to achieve desired move- ment. Spraying result, spraying quality and even durability of the machine can vary greatly between operators. The need for improved performance and result prompte egin design and development of a fully automated spraying system. praymec family of shot- crete sprayers is currently available with SpraySmart System as an option. This version includes two features to assist the operator; coordinated and point-to-point control modes which are built on top of the standard boom con- trol system. This configuration allows for the machine to be operated in either semi-automated or traditional control configurations. State-of-the-Art Sprayed Concrete Staying ahead in R&D and innovation is a critical component toward accom- plishing automated spraying. Recent developments in shotcrete equipment incorporated into sprayers in- clude low pulsation concrete pumping, constant flow accelerator dosing sys- tems, and high voltage power systems. These advancements combined with operator training through simulators and other means promote best spraying practices and optimum hardened shot- crete characteristics. During the past 40 years, more than ayers and auxiliary equipment have been manufactured for use in small to large tunnel and mine headings across the globe. There are two categories of sprayers with many con- figurations offered. Five sprayer models are designed for mining and six spray- ers for tunneling. Spraymec SF 050 and c are designed for use in smaller cross sections while the Spraymec 8100 VC, Spraymec eries, Spraymec Al- DVC are suitable for the largest mining and tunneling headings. SmartSpray 1: The First Step Toward Automation d its first version of the SmartSpray 1 system with a custom- er-delivered Sprayme at the World Tunneling Conference in Bergen in June 2017. SmartSpray 1 is an extension of the stem which provides seam- less control and diagnostics for all ma- chine functions. These systems com- bined allow the machine operator to use computer assistance in operation of the concrete spraying boom and nozzle through coordinated control and point- to point control modes. In coordinated control mode, the op- erator controls only the spraying nozzle with boom functions automatically controlled in alignment with nozzle po- sition. Only one joystick is required to perform basic concrete spraying move- ments, as opposed to the traditional two to four joysticks. Spraying direction can Towards automated concrete spraying BY LAURO LACERDA AND MARJO KOIVISTO

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