Abstract
The drilling of large underground tunnels, either for mines or public works, should be approached according to patterns characteristic in all these large projects, which are: safety, strength, economy, etc. Because of the differing techniques and use of the various machines in existence for such an end, the one most advantageous in each case should be chosen. Experience obtained in several years of work and testing teaches us that when the ground is soft, we obtain the best results with the rotary drill; otherwise, it is advisable to use the rotary-percussion drill. Finally, the automatic jumbo has been successfully used, which is very maneuverable and eliminates many of the inconveniences produced by drills, such as: noise, high air consumption and frequent jam-ups. It can be fed with electricity, diesel or diesel-electrical power. It is frequently used, especially in turnpikes.
Highlights
The automatic jumbo has been successfully used, which is very maneuverable and eiiminates many of the inconveniences produced by drills, such as: noise, high air consumption and frequent jam-ups
It can be fed with electricity, diesel or diesel-electrical power
Dieser ist leicht zu handhaben und schliesst zum Teil die von den Bohrmaschinen hervorgerufenen Nachteile aus: Lârm, hoher Luftverbrauch, haufige Sperrungen
Summary
Con referencia al modelo más importante, empleado para perforar una de las porciones del túnel de ¡a autopista de Seelisberg, en Suiza, diremos que el volquete EUCLID, tipo R.45, de 50 t de carga útil, con motor GM 650 CV, se ha provisto de una armadura especial soportando a su alrededor seis brazos periféricos de perforación, un brazo central, y dos navecillas con las cuales el minero tiene la posibilidad de acceder en cualquier punto de la galería gran sección. A partir de este momento se nos plantea el problema de la recogida del cargamento de los escombros y de su evacuación; para ello los medios clásicos son poco eficaces y, por lo tanto, deben ser reformados o totalmente modificados para que el frente sea rápidamente despedazado y el ciclo de perforación pueda reemprenderse en el más corto tiempo posible. En el caso de secciones medias, donde se plantea el problema del cruce de máquinas, recurrimos a la solución del jumbo-cargador
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