摘要:
A device for receiving an explosive material comprises a receptacle unit (103) for receiving the explosive material (110), and an anchoring unit (212), wherein the anchoring unit is arranged on an. outer surface of the receptacle unit, and wherein the anchoring unit is adapted to anchor the flexible receptacle unit in a borehole.
摘要:
A device (100) for receiving an explosive material (315) comprises a receptacle unit (103) for receiving the explosive material, and an anchoring unit (104), wherein the anchoring unit is arranged on an outer surface of the receptacle unit, and wherein the anchoring unit is adapted to anchor the flexible receptacle unit in a borehole (313).
摘要:
Cartridge (10c) comprises body (12) defining a volume for holding energetic material. Body (12) has a first end (16) located adjacenta toe (48) of hole (46) formed in hard material (47), and a second end (18) directed towards collar (50) of hole (46). End (18) is tapered to form a point or wedge-like member. Stemming material (52) is placed in hole (46) to a level below free face (54) of hard material (47) and mechanically held in place by stemming bar (56). When the energetic material is initiated, gas pressure forces cartridge (10c) towards collar (50). As this occurs, the point acts to increase the radial compressive force on stemming material (52) in the annular region between end (18) and the adjacent portion of hole (46). This increases the sealing effect of stemming material (52) and maintains constant the volume in hole (46) within which the gas operates.
摘要:
A blasting arrangement (10) includes drillholes (30) in a rock mass (20). Blind ends (32) are drilled to a desired level and, if necessary, are adjusted as shown at (62) to said level. Each hole (30) is plugged by means of a plug (42), which is protected by non flammable buffer material (44), at a level (40) spaced from the end (32). Explosive (50) is charged above the level (40) and the hole is tamped, shown at (60). The holes are detonated desirably by detonators (52), forcing the plugs (42) downwardly and compressing air in chambers (34) above the ends (32). The weakest part of each hole, around the end (32), is split causing a three dimensional zone of weakness at the level of the ends (32). Air forced into the zone of weakness causes a fracture zone (70) at that level, inhibiting propagation of blasting shock waves and protecting the material underneath the level of the ends (32).
摘要:
A method of charging hole (12) drilled in rock or concrete (10), the method including inserting a quantity of energetic material (14) on or near the bottom (16) of hole (12). Lead (28) connects initiator (18) with an initiation source at ground level. Hole (12) is filled with stemming material (20) to a level (L) and plug (22) is positioned to rest on stemming material (20). Lead (28) threads through plug (22) via a slot, recess or passage. Mass (30) such as the bucket of excavator (32) and plug (22) prevent stemming material (20) from being blown out of hole (12) when energetic material (14) is detonated. The risk of collar area (C) being fragmented and energised to produce fly rock is reduced since the length of plug (22) is commensurate with the length of collar area (C). Plug (22) and stemming material (20) can be replaced by a stemming bar, with the stemming bar attached directly to energetic material (14).
摘要:
Rock and other hard materials, such as concrete, are fragmented by a controlled small-charge blasting process. A cartridge (200) containing an explosive charge is inserted at the bottom of a short hole (240) drilled in the rock. The explosive charge is configured to provide the desired pressure in the hole bottom, including, if desired, a strong shock spike at the hole bottom to enhance microfracturing. The cartridge (200) is held in place or stemmed by a massive stemming bar of high-strength material such as steel. The cartridge (200) incorporates additional internal volume designed to control the application of pressure in the bottom hole volume by the detonating explosive. The major features of the method and apparatus are the relatively low-energy of the flyrock and the relatively small amount of explosive required to break the rock.
摘要:
A pair of pressure pots (2,1) or pressure chambers are provided in which the blasting media is introduced for dispensing the media to conduits (11,12) leading to blasting guns. The media supply valves and air supply valves are controlled by a cam shaft assembly (54,70-74). Further, a metering hopper (3) having a media supply valve (31) is provided between the storage hopper (4) and upper pressure pot (2) or chamber. The media and air valves are operated in timed sequence as determined by the cam shaft assembly.
摘要:
Beim Brechen von hartem Material wird insbesondere zur Vermeidung von Splitterflug und knallartiger Lärmentwicklung in ein vorgebohrtes Sprengloch (2) die Sprengladung eingebracht, Flüssigkeit in das Sprengloch (2) eingefüllt und vor dem Zünden der Sprengladung (3) das Sprengloch (2) mit einem Impulsreflektor (8; 7, 8') verschlossen, dessen Masse mindestens fünfmal so groß ist wie die Masse der in das Sprengloch (2) eingefüllten Flüssigkeit. Der Impulsreflektor kann als kompakter Stahlblock eine ebene Grundfläche besitzen oder aus zwei Teilen (7) und (8') bestehen, wovon das Teil (7) dem Sprenglochquerschnitt angepaßt ist und nach dem erfindungsgemäßen Verfahren ganz oder teilweise in das Sprengloch (2) eingeführt wird.