EP0991912B1 - Device for provoking an avalanche - Google Patents
Device for provoking an avalanche Download PDFInfo
- Publication number
- EP0991912B1 EP0991912B1 EP98924520A EP98924520A EP0991912B1 EP 0991912 B1 EP0991912 B1 EP 0991912B1 EP 98924520 A EP98924520 A EP 98924520A EP 98924520 A EP98924520 A EP 98924520A EP 0991912 B1 EP0991912 B1 EP 0991912B1
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- EP
- European Patent Office
- Prior art keywords
- leg
- gun
- base
- downstream end
- ballast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000007789 gas Substances 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000011378 shotcrete Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
Definitions
- the present invention relates to a device for triggering a avalanche comprising a gas cannon whose upstream end is fixed to a base securely anchored to the mountain, and the downstream end of which is carried by at least one foot so that the mouth of the barrel is arranged above the snowpack.
- avalanche triggering devices comprising a gas cannon fixedly mounted on a mountainside, the bottom of which is securely anchored against a base made of a concrete block and whose the mouth opens above the snowpack, such as those described in US Patent US-A-5,107,765.
- These guns are designed to trigger an avalanche in exposed areas, for example above ski resorts or residential areas.
- These devices are very effective to trigger avalanche flows in areas known as avalanche corridors, i.e. mostly made up of steep gorges where snow accumulates quickly and can reach unstabilized critical masses. They turned out particularly effective on light and sparse snow layers which contain a large volume of air trapped in the snow crystals.
- the blast caused by the detonation generates a wave effect with a strong initial compression followed by a trigger which breaks the snowpack and raises the snow mass enough to start a flow avalanche.
- the mouth of the barrel is necessarily located above of the snowpack.
- the devices require a rigid and extremely solid anchoring to the side of the mountain, in particular by means of a concrete base which is anchored to the rock and which constitutes the rear seat of the gun proper.
- the device To support the front part, near the mouth of the barrel, the device has one or more feet which are also anchored securely in the mountains.
- the present invention proposes to overcome these drawbacks by offering a effective solution to the problems mentioned above, this solution having in in addition to the advantage of lowering the cost of installation on site and considerably increase the longevity of the device.
- the device as defined in the preamble and characterized by that the upstream end of the barrel is fixed to the base by a joint and in that the downstream end is ballasted, the foot being placed freely on a base secured to the terrain.
- the downstream end of the barrel is ballasted by means of a ballast mounted near the mouth.
- Said ballast may include a tank containing shot or concrete introduced through an opening in said tank.
- downstream end of the barrel is ballasted by means a ballast housed in the foot which supports this downstream end.
- said foot is hollow and said ballast consists of shot or concrete.
- the foot rests freely on a base rigidly anchored to the side of the mountain and is arranged substantially vertically and coupled to the barrel by an articulation of horizontal axis.
- the device includes ignition means arranged in the vicinity of the upstream end of the barrel.
- said ignition means comprise at least one spark plug ignition connected to an ignition system comprising a pressure switch associated with a two-state microswitch, a capacitor, an electric battery and an igniter, this microswitch being arranged to put in communication the capacitor with the igniter when it is in a first state and for put the capacitor in communication with the battery when it is in its second state.
- an ignition system comprising a pressure switch associated with a two-state microswitch, a capacitor, an electric battery and an igniter, this microswitch being arranged to put in communication the capacitor with the igniter when it is in a first state and for put the capacitor in communication with the battery when it is in its second state.
- the device can also include a safety line which connects the base at the foot.
- said device comprises a stop pin arranged vertically in the base supporting the foot, said foot support base being of concrete and having a steel base covered with a plate rubber to cushion the fallout of said foot.
- the device 10 as shown consists essentially of a gas exploiter 11 comprising a barrel 12, fixed by its upstream end to a base 13 and whose downstream end is supported by a foot 14.
- This foot 14 rests on a base 15 consisting of a block in concrete with a steel sole 9 covered with a rubber plate 16.
- Base 13 also consists of a solid concrete block anchored to the side of the mountain.
- the barrel 12 is an elongated tubular part comprising a straight section 12a and a curved section 12b which constitutes the downstream end of the exploder and defines its mouth.
- the upstream end is fixed to the base by a hinge 17 having an axis horizontal which allows relative rotation of the barrel according to arrow A.
- the foot 14 consists of a substantially cylindrical tubular element which is fixed to the curved section 12b of the barrel by means of a joint 19 to horizontal axis 20.
- This joint consists of a first pair elements 21a, in the form of fans, which are fixed in parallel on both sides and on the other side of the curved section 12b of the barrel 12 and of a second pair elements 21b, in the form of flanges, which are fixed in parallel on both sides and on the other side of the upper part of the foot 14.
- These two pairs of elements are coupled together by means of the horizontal axis 20.
- the foot 14 is ballasted for example by means of a mass of shot or concrete which is placed inside the hollow tube which constitutes it.
- the foot serves as a support for the barrel in the rest phase and it is suspended from this barrel at the time of a shot, when the downstream end of the barrel lifts under the breath of the explosion of gases.
- the purpose of ballast is to limit the barrel pivot in the direction of arrow A and ensure the recall of this foot in its original position
- a safety line 22 connects the base of the foot 14 to the base 13. This line is on the one hand fixed to a flange 23 anchored in this base and on the other hand to a flange 24 fixed to the foot 14.
- a stop pin 25 is also fixed in the base 15 through the sole 9 and the rubber plate 16 to prevent, if necessary, the foot will fall from this base after a shot.
- Means 54 which will be described in more detail with reference to FIG. 4, are mounted floating to avoid lightning problems and overcomes the part rear of barrel 12.
- FIG. 2 Another embodiment is illustrated in Figure 2.
- the difference major of this variant compared to the previous one is that the 114 foot is not ballasted, unlike foot 14 of Figure 1 and that ballast 115 intended to accelerate the fall of the mouth of the barrel after a shot and to prevent this cannon from rising too high under the action of the forces generated by the breath of the explosion rose near the mouth of the cannon.
- a ballast is mounted on the barrel near its mouth. He introduces himself preferably in the form of a tank 116 having an upper opening 117 into which large quantities of shot or concrete can be dumped sufficient.
- Figure 3 shows a detail view illustrating the upstream part of the barrel 12 proper illustrated by FIG. 2, with the connection terminals 50 and 51 of two spark plugs, the ends 52 and 53 of the gas supply fuel and oxygen and ignition means 54.
- a flexible conduit 55 connects these ignition means to the nozzle 53 for supplying oxygen.
- a protective cover 56 is arranged so that it can be folded and adapted over the top these different organs.
- the ignition means 54 comprise a pressure switch 30 arranged to control two microswitches 31 and 32 in two states with three output terminals, namely a C terminal called output common, one terminal T called working terminal and one terminal R called rest station.
- the ignition means also include, in the example shown in which two spark plugs 26 and 27 are respectively provided for igniting the gas mixture detonator, two capacitors 33 and 34, two cells or batteries accumulators 35 and 36 and two igniters 37 and 38.
- the pressure switch 30 is connected to the oxygen supply pipe by the flexible pipe 55 or can be mounted directly on said conduit.
- the microswitches 31 and 32 have two states.
- the first state called the rest state, is obtained when no gas is flowing in the conduits and there is no pressure in the pressure switch 30.
- the capacitors 33 and 34 are then in closed circuit with igniters 37 and 38, battery / capacitor circuits being open.
- the second state known as the working state, is obtained when one of the two gases circulating in the conduits creates a slight overpressure in the pressure switch 30, which causes a change of state of the microswitches 31 and 32 and the transition from the state of rest to that of work.
- Batteries 35 and 36 are found connected in closed circuit to capacitors 33 and 34 and the circuit with the capacitor / igniter open, the capacitors charge for the gas injection time.
- said first state is obtained when oxygen circulates in the pipe and creates, via the hose 55, a pressure in the pressure switch 30.
- the capacitors When the capacitors are discharged, the latter generate a train of sparks in the candles they fuel respectively.
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- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Eye Examination Apparatus (AREA)
- Vehicle Body Suspensions (AREA)
- Emergency Lowering Means (AREA)
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- Portable Nailing Machines And Staplers (AREA)
- Valve Device For Special Equipments (AREA)
- Noodles (AREA)
- Air Bags (AREA)
Abstract
Description
La présente invention concerne un dispositif de déclenchement d'une avalanche comportant un canon à gaz dont l'extrémité amont est fixée à une embase solidement ancrée à la montagne, et dont l'extrémité aval est portée par au moins un pied de manière telle que l'embouchure du canon soit disposée au-dessus du manteau neigeux.The present invention relates to a device for triggering a avalanche comprising a gas cannon whose upstream end is fixed to a base securely anchored to the mountain, and the downstream end of which is carried by at least one foot so that the mouth of the barrel is arranged above the snowpack.
On connaít des dispositifs de déclenchement des avalanches comportant un canon à gaz monté de façon fixe à flanc de montagne, dont le fond est solidement ancré contre une embase constituée d'un bloc en béton et dont l'embouchure débouche au-dessus du manteau neigeux, tels que ceux décrits dans le brevet américain US-A-5 107 765. Ces canons sont conçus pour déclencher une avalanche dans des zones exposées, par exemple au-dessus de stations de ski ou de zones d'habitation. Ces dispositifs sont très efficaces pour déclencher des coulées d'avalanches dans des zones connues comme des couloirs d'avalanches, c'est-à-dire constituées la plupart du temps par des gorges à forte pente où l'accumulation de la neige se fait rapidement et peut atteindre des masses critiques non stabilisées. Ils se sont révélés particulièrement efficaces sur les couches de neige légère et peu dense qui contiennent un volume important d'air emprisonné dans les cristaux de neige. Le souffle provoqué par la détonation engendre un effet de vague avec une forte compression initiale suivie d'une détente qui casse le manteau neigeux et soulève la masse neigeuse de façon suffisante pour déclencher une coulée d'avalanche. A cet effet l'embouchure du canon est obligatoirement située au-dessus du manteau neigeux.Are known avalanche triggering devices comprising a gas cannon fixedly mounted on a mountainside, the bottom of which is securely anchored against a base made of a concrete block and whose the mouth opens above the snowpack, such as those described in US Patent US-A-5,107,765. These guns are designed to trigger an avalanche in exposed areas, for example above ski resorts or residential areas. These devices are very effective to trigger avalanche flows in areas known as avalanche corridors, i.e. mostly made up of steep gorges where snow accumulates quickly and can reach unstabilized critical masses. They turned out particularly effective on light and sparse snow layers which contain a large volume of air trapped in the snow crystals. The blast caused by the detonation generates a wave effect with a strong initial compression followed by a trigger which breaks the snowpack and raises the snow mass enough to start a flow avalanche. For this purpose the mouth of the barrel is necessarily located above of the snowpack.
Ces appareils nécessitent un ancrage rigide et extrêmement solide au flanc de la montagne, en particulier au moyen d'une embase en béton qui est ancrée au rocher et qui constitue l'assise arrière du canon proprement dit. Pour soutenir la partie frontale, voisine de l'embouchure du canon, le dispositif comporte un ou plusieurs pieds qui sont également ancrés solidement dans la montagne.These devices require a rigid and extremely solid anchoring to the side of the mountain, in particular by means of a concrete base which is anchored to the rock and which constitutes the rear seat of the gun proper. To support the front part, near the mouth of the barrel, the device has one or more feet which are also anchored securely in the mountains.
Au moment du tir, la poussée qui s'exerce sur la zone frontale du canon atteint des valeurs de 80 ou 160 tonnes selon les modèles, et les forces qui se manifestent et qui tendent à désarrimer ces pieds doivent être contrecarrées par des forces de réaction générées par l'ancrage particulièrement robuste.When firing, the thrust exerted on the front area of the barrel reaches values of 80 or 160 tonnes depending on the model, and the forces that manifest themselves and tend to detach these feet must be thwarted by reaction forces generated by the anchor particularly robust.
De tels ancrages sont extrêmement coûteux et ne résistent bien, que si le sol dans lequel ils sont réalisés est stable et résistant. Dans des sols meubles, instables ou n'offrant pas la résistance requise, les pieds supportant l'embouchure du canon ont tendance à se désancrer sous l'effet des tractions successives engendrées à chaque tir. Comme ces dispositifs sont généralement installés dans des sites difficiles à atteindre, voire dangereux, les réparations sont coûteuses et complexes.Such anchors are extremely expensive and only resist well if the floor in which they are made is stable and resistant. In loose soil, unstable or not offering the required resistance, the feet supporting the mouth of the barrel tends to come off under the effect of pulls successive spawns on each shot. As these devices are generally installed in sites that are difficult to reach or even dangerous, repairs are expensive and complex.
La présente invention se propose de pallier ces inconvénients en offrant une solution efficace aux problèmes mentionnés ci-dessus, cette solution ayant en outre l'avantage de permettre d'abaisser le coût de l'installation sur le site et d'augmenter considérablement la longévité du dispositif.The present invention proposes to overcome these drawbacks by offering a effective solution to the problems mentioned above, this solution having in in addition to the advantage of lowering the cost of installation on site and considerably increase the longevity of the device.
Ce but est atteint par le dispositif tel que défini en préambule et caractérisé en ce que l'extrémité amont du canon est fixée à l'embase par une articulation et en ce que l'extrémité aval est lestée, le pied étant posé librement sur un socle rendu solidaire du terrain. This object is achieved by the device as defined in the preamble and characterized by that the upstream end of the barrel is fixed to the base by a joint and in that the downstream end is ballasted, the foot being placed freely on a base secured to the terrain.
Selon une première variante de réalisation, l'extrémité aval du canon est lestée au moyen d'un lest monté au voisinage de l'embouchure.According to a first alternative embodiment, the downstream end of the barrel is ballasted by means of a ballast mounted near the mouth.
Ledit lest peut comporter une cuve contenant de la grenaille ou du béton introduit par une ouverture ménagée sur ladite cuve.Said ballast may include a tank containing shot or concrete introduced through an opening in said tank.
Selon une deuxième variante, l'extrémité aval du canon est lestée au moyen d'un lest logé dans le pied qui supporte cette extrémité aval.According to a second variant, the downstream end of the barrel is ballasted by means a ballast housed in the foot which supports this downstream end.
De préférence, ledit pied est creux et ledit lest constitué de grenaille ou de béton.Preferably, said foot is hollow and said ballast consists of shot or concrete.
Dans toutes les formes de réalisation, le pied repose librement sur un socle rigidement ancré au flanc de la montagne et est disposé sensiblement verticalement et couplé au canon par une articulation d'axe horizontal.In all embodiments, the foot rests freely on a base rigidly anchored to the side of the mountain and is arranged substantially vertically and coupled to the barrel by an articulation of horizontal axis.
De façon avantageuse, le dispositif comporte des moyens d'allumage disposés au voisinage de l'extrémité amont du canon.Advantageously, the device includes ignition means arranged in the vicinity of the upstream end of the barrel.
De préférence, lesdits moyens d'allumage comportent au moins une bougie d'allumage raccordée à un système d'allumage comprenant un pressostat associé à un microrupteur à deux états, un condensateur, une pile électrique et un allumeur, ce microrupteur étant agencé pour mettre en communication le condensateur avec l'allumeur lorsqu'il est dans un premier état et pour mettre le condensateur en communication avec la pile lorsqu'il est dans son deuxième état.Preferably, said ignition means comprise at least one spark plug ignition connected to an ignition system comprising a pressure switch associated with a two-state microswitch, a capacitor, an electric battery and an igniter, this microswitch being arranged to put in communication the capacitor with the igniter when it is in a first state and for put the capacitor in communication with the battery when it is in its second state.
Le dispositif peut également comporter un filin de sécurité qui relie l'embase au pied.The device can also include a safety line which connects the base at the foot.
De préférence, ledit dispositif comporte une broche d'arrêt disposée verticalement dans le socle supportant le pied, ledit socle d'appui du pied étant en béton et comportant une semelle en acier recouverte d'une plaque en caoutchouc pour amortir la retombée dudit pied.Preferably, said device comprises a stop pin arranged vertically in the base supporting the foot, said foot support base being of concrete and having a steel base covered with a plate rubber to cushion the fallout of said foot.
La présente invention sera mieux comprise en référence à la description
d'exemples de réalisation préférés et aux dessins annexés, donnés à titre
d'exemples non limitatifs et dans lesquels :
En référence à la figure 1, le dispositif 10 tel que représenté se compose
essentiellement d'un exploiteur à gaz 11 comprenant un canon 12, fixé par
son extrémité amont à une embase 13 et dont l'extrémité aval est supportée
par un pied 14. Ce pied 14 repose sur un socle 15 constitué d'un bloc en
béton portant une semelle en acier 9 recouverte d'une plaque en caoutchouc
16. L'embase 13 est également constituée d'un bloc en béton solidement
ancré au flanc de la montagne. Le canon 12 est une pièce tubulaire allongée
comprenant un tronçon rectiligne 12a et un tronçon incurvé 12b qui constitue
l'extrémité aval de l'exploseur et définit son embouchure. Referring to Figure 1, the
L'extrémité amont est fixée à l'embase par une articulation 17 ayant un axe
horizontal qui autorise un pivotement relatif du canon selon la flèche A.The upstream end is fixed to the base by a
Le pied 14 est constitué d'un élément tubulaire sensiblement cylindrique qui
est fixé au tronçon incurvé 12b du canon au moyen d'une articulation 19 à
axe horizontal 20. Cette articulation se compose d'une première paire
d'éléments 21a, en forme d'éventails, qui sont fixés parallèlement de part et
d'autre du tronçon incurvé 12b du canon 12 et d'une seconde paire
d'éléments 21b, en forme de brides, qui sont fixés parallèlement de part et
d'autre de la partie supérieure du pied 14. Ces deux paires d'éléments sont
couplées entre elles au moyen de l'axe horizontal 20.The
Le pied 14 est lesté par exemple au moyen d'une masse de grenaille ou de
béton qui est disposée à l'intérieur du tube creux qui le constitue. Dans la
pratique, le pied sert d'appui au canon en phase de repos et il est suspendu à
ce canon au moment d'un tir, lorsque l'extrémité aval du canon se soulève
sous l'effet du souffle de l'explosion des gaz. Le lest a pour but de limiter le
pivotement du canon dans le sens de la flèche A et d'assurer le rappel de ce
pied dans sa position initialeThe
Un filin de sécurité 22 relie la base du pied 14 à l'embase 13. Ce filin est
d'une part fixé à une bride 23 ancrée dans cette embase et d'autre part à une
bride 24 fixée au pied 14. Une broche d'arrêt 25 est par ailleurs fixée dans le
socle 15 à travers la semelle 9 et la plaque de caoutchouc 16 pour empêcher,
le cas échéant, le pied de tomber de ce socle après un tir. Des moyens
d'allumage 54, qui seront décrits plus en détail en référence à la figure 4, sont
montés flottants pour éviter les problèmes de foudre et surmontent la partie
arrière du canon 12.A
Une autre forme de réalisation est illustrée par la figure 2. La différence
majeure de cette variante par rapport à la précédente est que le pied 114
n'est pas lesté, contrairement au pied 14 de la figure 1 et que le lest 115
destiné à accélérer la retombée de l'embouchure du canon après un tir et à
éviter que ce canon ne s'élève trop haut sous l'action des forces générées par
le souffle de l'explosion, est monté au voisinage de l'embouchure du canon.
Un lest est monté sur le canon à proximité de son embouchure. Il se présente
de préférence sous la forme d'une cuve 116 ayant une ouverture supérieure
117 dans lequel on peut déverser de la grenaille ou du béton en quantités
suffisantes.Another embodiment is illustrated in Figure 2. The difference
major of this variant compared to the previous one is that the 114 foot
is not ballasted, unlike
Les autres composants du dispositif qui sont similaires à ceux qui ont déjà été décrits ou qui seront décrits plus en détail en référence aux figures suivantes portent ou porteront les mêmes numéros de référence.The other components of the device which are similar to those which have already been described or which will be described in more detail with reference to the following figures bear or will bear the same reference numbers.
La figure 3 représente une vue de détail illustrant la partie amont du canon 12
proprement dit illustré par la figure 2, avec les bornes de raccordement 50 et
51 de deux bougies d'allumage, les embouts 52 et 53 d'amenée du gaz
combustible et de l'oxygène et les moyens d'allumage 54. Un conduit flexible
55 relie ces moyens d'allumage à l'embout 53 d'amenée de l'oxygène. Un
capot de protection 56 est agencé pour pouvoir être replié et adapté pardessus
ces différents organes.Figure 3 shows a detail view illustrating the upstream part of the
En référence à la figure 4, les moyens d'allumage 54 comprennent un
pressostat 30 agencé pour commander deux microrupteurs 31 et 32 à deux
états ayant trois bornes de sortie, à savoir une borne C appelée sortie
commune, une borne T appelée borne de travail et une borne R appelée
borne de repos. Les moyens d'allumage comprennent par ailleurs, dans
l'exemple représenté dans lequel deux bougies d'allumage 26 et 27 sont
respectivement prévues pour assurer la mise à feu du mélange de gaz
détonant, deux condensateurs 33 et 34, deux piles ou batteries
d'accumulateurs 35 et 36 et deux allumeurs 37 et 38. Le pressostat 30 est
relié au conduit d'amenée d'oxygène par le conduit flexible 55 ou peut être
monté directement sur ledit conduit. Referring to Figure 4, the ignition means 54 comprise a
Les microrupteurs 31 et 32 ont deux états. Le premier état, dit état de repos,
est obtenu quand aucun gaz ne circule dans les conduits et qu'il n'y a pas de
pression dans le pressostat 30. Les condensateurs 33 et 34 sont alors en
circuit fermé avec les allumeurs 37 et 38, les circuits piles/condensateurs
étant ouverts. Le deuxième état, dit état de travail, est obtenu lorsqu'un des
deux gaz circulant dans les conduits crée une légère surpression dans le
pressostat 30, ce qui provoque un changement d'état des microrupteurs 31 et
32 et le passage de l'état de repos à celui de travail. Les piles 35 et 36 se
trouvant raccordées en circuit fermé aux condensateurs 33 et 34 et le circuit
condensateur/allumeur étant ouvert, les condensateurs se chargent pendant
la durée d'injection des gaz.The
Dès que l'injection des gaz dans l'exploseur 11 est terminée, la pression sur la
membrane du pressostat 30 devient nulle et les microrupteurs 31 et 32
reviennent à l'état de repos fermant le circuit condensateur/allumeur et
ouvrant le circuit pile/condensateur. Chaque condensateur se décharge alors
complètement dans l'allumeur correspondant et provoque un train d'étincelles
sur la bougie concernée pendant environ 4 à 5 s .Les microrupteurs restent
dans cet état jusqu'à la prochaine injection de gaz.As soon as the injection of gases into the
Le fait de prévoir deux bougies n'est pas limitatif. En effet une seule bougie pourrait suffire pour assurer la mise à feu. Toutefois, les règles de sécurité plaident en faveur du doublage du système d'allumage tel que prévu.The fact of providing two candles is not limiting. Indeed a single candle could be sufficient to ensure ignition. However, the safety rules argue in favor of doubling the ignition system as planned.
Dans la pratique, ledit premier état est obtenu lorsque l'oxygène circule dans
la conduite et crée, par l'intermédiaire du flexible 55, une pression dans le
pressostat 30. Au moment de la décharge des condensateurs, ces derniers
génèrent un train d'étincelles dans les bougies qu'ils alimentent
respectivement.In practice, said first state is obtained when oxygen circulates in
the pipe and creates, via the
Claims (12)
- A device for provoking an avalanche, consisting of a gas gun (12), the upstream end of which is attached to a seat (13) solidly anchored to the mountain and the downstream end of which is supported by at least one leg (14) so that the mouth of the gun is located above the snow cover, characterized in that the upstream end of the gun (12) is affixed to the seat (13) with an articulation (17), and in that the downstream end is ballasted, the leg (14) being freely positioned in a base (15) integral with the ground.
- The device according to claim 1, characterized in that the downstream end of the gun is ballasted with a ballast (115) attached near the mouth.
- The device according to claim 2, characterized in that the ballast consists of a container (116) holding granular material or concrete introduced through an opening (117) in said container.
- The device accordiing to claim 1, characterized in that the downstream end of the gun is ballasted by means of a ballast housed within the leg (14) which supports said downstream end.
- The device according to claim 4, characterized in that the leg (14) is hollow and contains ballast consisting of granular material or concrete.
- The device according to claim 1, characterized in that the leg (14) rests freely on a base (15) rigidly attached to the side of the mountain.
- The device according to claim 1, characterized in that the leg is generally vertical and connected to the gun (12) by means of an articulation (19) with a horizontal axle (20).
- The device according to claim 1, characterized in that it comprises an ignition means (54) arranged near the upstream end of the gun.
- The device according to claim 8, characterized in that the ignition means (54) comprises at least one spark plug (26) connected to an ignition system consisting of a pressure controller (30) associated with a dual state microbreaker (31), a condenser (33), an electric battery (35) and an igniter (37), said microbreaker being designed to provide communication between the condenser and the igniter when in a first state, and communication between the condenser and the battery when in the second state.
- The device according to one of the preceding claims, characterized in that it comprises a safety wire (22) connecting the base (13) with the leg (14).
- The device according to one of the preceding claims, characterized in that it comprises a stop pin (25) arranged vertically in the base (15) supporting the leg.
- The device according to claim 6, characterized in that the base (15) supporting the leg (14) is made of concrete and comprise a steel base (9) covered with a rubber plate (16) to cushion the impact of said leg.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9708246 | 1997-06-26 | ||
| FR9708246A FR2765321B1 (en) | 1997-06-26 | 1997-06-26 | DEVICE FOR TRIGGERING AN AVALANCHE |
| PCT/IB1998/000972 WO1999000638A1 (en) | 1997-06-26 | 1998-06-22 | Device for provoking an avalanche |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0991912A1 EP0991912A1 (en) | 2000-04-12 |
| EP0991912B1 true EP0991912B1 (en) | 2001-09-05 |
Family
ID=9508668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98924520A Expired - Lifetime EP0991912B1 (en) | 1997-06-26 | 1998-06-22 | Device for provoking an avalanche |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6374717B1 (en) |
| EP (1) | EP0991912B1 (en) |
| JP (1) | JP3956060B2 (en) |
| AT (1) | ATE205298T1 (en) |
| CA (1) | CA2292812C (en) |
| DE (1) | DE69801581T2 (en) |
| ES (1) | ES2163278T3 (en) |
| FR (1) | FR2765321B1 (en) |
| WO (1) | WO1999000638A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2925152B1 (en) * | 2007-12-14 | 2013-06-28 | Technologie Alpine De Securite T A S | DEVICE FOR TRIGGERING AVALANCHES |
| DE102009037705B4 (en) | 2009-08-18 | 2014-03-27 | Geräte- und Vorrichtungsbau Spitzner OHG | Method and device for triggering avalanches |
| FR2953922B1 (en) * | 2009-12-10 | 2011-12-09 | Technologie Alpine De Securite Tas | DEVICE FOR TRIGGERING AVALANCHES |
| FR2958739B1 (en) * | 2010-04-09 | 2012-05-11 | Technologie Alpine De Securite Tas | AVALANCHE RELEASE DEVICE |
| FR2964732B1 (en) | 2010-09-14 | 2013-06-14 | Alp Artifices | PROJECTILE FOR AVALANCHE TRAPPING |
| US8596929B2 (en) * | 2011-07-05 | 2013-12-03 | James R. Hughes | Avalanche control system and method |
| US11333474B2 (en) * | 2016-08-07 | 2022-05-17 | Explosive Alternatives, Inc. | Apparatus and method for blasting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AR245818A1 (en) * | 1988-03-03 | 1994-02-28 | Schippers Jacob | Process and device for triggering an avalanche |
-
1997
- 1997-06-26 FR FR9708246A patent/FR2765321B1/en not_active Expired - Fee Related
-
1998
- 1998-06-22 WO PCT/IB1998/000972 patent/WO1999000638A1/en active IP Right Grant
- 1998-06-22 DE DE69801581T patent/DE69801581T2/en not_active Expired - Lifetime
- 1998-06-22 CA CA002292812A patent/CA2292812C/en not_active Expired - Lifetime
- 1998-06-22 JP JP50540099A patent/JP3956060B2/en not_active Expired - Fee Related
- 1998-06-22 ES ES98924520T patent/ES2163278T3/en not_active Expired - Lifetime
- 1998-06-22 EP EP98924520A patent/EP0991912B1/en not_active Expired - Lifetime
- 1998-06-22 AT AT98924520T patent/ATE205298T1/en active
- 1998-06-22 US US09/446,240 patent/US6374717B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2765321B1 (en) | 1999-09-17 |
| CA2292812A1 (en) | 1999-01-07 |
| ES2163278T3 (en) | 2002-01-16 |
| US6374717B1 (en) | 2002-04-23 |
| CA2292812C (en) | 2006-09-12 |
| DE69801581D1 (en) | 2001-10-11 |
| JP3956060B2 (en) | 2007-08-08 |
| ATE205298T1 (en) | 2001-09-15 |
| JP2002506512A (en) | 2002-02-26 |
| WO1999000638A1 (en) | 1999-01-07 |
| EP0991912A1 (en) | 2000-04-12 |
| FR2765321A1 (en) | 1998-12-31 |
| DE69801581T2 (en) | 2002-07-11 |
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