Abrégé

The invention relates to means for controlling the working atmosphere in tunnels, characterised in that it consists of three interconnected subsystems: ventilation (A), gas confinement (B), and environmental monitoring (C); where, once the blasting has been triggered and the pressure wave generated thereby has been released, the gas confinement barrier is closed. The ventilation used is a mixed suction-blower system such that all of the blast gases return via the suction conduit, the suction ventilator (7) being activated at maximum power such that the blower ventilation will have to counteract the suction flow in the cul-de-sac since the ventilation lock (3) will be in a position in which part of the flow will advance while the other part will return via the zone preceding the barrier, via the gallery, and the blower flow will be equal to the sum of the suction flow plus the flow returning via the gallery.

Classes IPC  ?

• E21F 1/00 - Ventilation des mines ou tunnelsDistribution des courants de ventilation
• E21F 7/00 - Procédés ou dispositifs pour enlever les gaz, avec ou sans utilisation ultérieure de ceux-ci à une fin quelconque
• E21F 17/12 - Portes de barrage
• E21F 5/20 - Enlèvement ou abattage de la poussière

Abrégé

Drilling device that is characterized in that it comprises a cylindrical rod (1), the lower end (1a) of which is connected to the rotating motor of the machine and the upper end (1b) of which is connected to a guide tube; and a casing (2) that comprises an elbow (6) that connects said casing (2) to the nozzle of an air-injection hose, and wherein the casing (2) and the rod (1) are joined by means of at least one circular thread (3) covering the double roller bearing (2e) of the casing (2); a cylindrical body (4) that secures the first roller bearing (2d) of the casing (2); and a threaded cylindrical washer (5) that fastens the cylindrical body (4) and comprises a fastening screw.

Classes IPC  ?

• E21B 4/16 - Moyens d'entraînement multiples au fond du trou, p. ex. pour le forage combiné par percussion et par rotationMoyens d'entraînement pour unités de forage à plusieurs trépans
• E21B 10/38 - Trépans à percussion caractérisés par des canaux ou des buses pour les fluides de forage

Produits et services

Construction and building construction of public and private civil works of all kinds (wells, galleries, tunnels, mining structures, bridges, viaducts, buildings, railway, hydraulic and maritime works, roads and highways, runways). Scientific and technological services and research and design relating thereto; industrial analysis and research services and engineering; geological survey; architectural consultancy; quality control; technical project studies; geological prospecting, industrial design, construction drafting, land surveying.

Produits et services

Construction services.