DRILL & BLAST
and sometime pneumatic, breakers are used for scaling usually mounted on an hydraulic excavator, the particular stresses of the task call for specially designed tools that can better stand the additional forces, and sometimes abuse, involved in the task. Intermittent scaling needs may allow the use of more standard breakers, such as may be used for face excavation, if the likely increased maintenance can be tolerated.
Breakers Atlas Copco’s range of breakers includes scaler versions of the SB 302 and SB 452 ‘Solid
Body’ breakers. Te latest generation, introduced in 2010, has a higher blow frequency, with an automatic decrease if the tool is not pressed hard on the surface, thus decreasing unnecessary vibrations. A water channel for dust suppression, and automatic lubrication channel are housed within the breaker body for protection against falling rock allows you to spray water to reduce dust levels. Te same manufacturer’s dedicated mining scalers, a series of four models of Scaletec rig plus diesel-hydraulic versions, are enjoying increasing sales interest amongst mines wishing
This low-profile scaler produce by Maquinaria Lorenzana of Spain is also available in Latin America. It has a telescopic boom with protected hydraulics and a specially designed hydraulic hammer/rockbreaker
Even in open-cut mining, scaling may
be required particularly on high walls if they are expected to stand without further excavation for a considerable time. Te other causal factor is the effect of blasting in which accuracy of peripheral cut holes may be important for safety, if not for production, and overcharging should be avoided for safety as well as economy.
Systematic
Te best, and most widely adopted, strategy against smaller falls of ground is a systematic approach to removing the hazard, as soon as possible after a blast. Primarily none should enter a hazardous area before it is made safe.
06 INTERNATIONAL MINING ENGINEER
Traditionally scaling has been a manual practice using crowbars or specially designed scaling bars such as the range available from DSI (Dywidag-System International). Tese features moil or chisel points with solid steel, tube steel or aluminium bodies. Access and reach may often be
problems; best carrying it out from a properly designed access basket starting from the last ‘permanently’ supported area and approaching the face one reach length at a time. Introduction of mechanised scaling makes it easier to adopt a systematic, and thus safer, approach to task, with improved speed to make it less laborious and improve overall mining efficiency. While standard designs of hydraulic,
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