EP1987290A1 - Avalanche triggering system - Google Patents

Avalanche triggering system

Info

Publication number
EP1987290A1
EP1987290A1 EP20070731022 EP07731022A EP1987290A1 EP 1987290 A1 EP1987290 A1 EP 1987290A1 EP 20070731022 EP20070731022 EP 20070731022 EP 07731022 A EP07731022 A EP 07731022A EP 1987290 A1 EP1987290 A1 EP 1987290A1
Authority
EP
European Patent Office
Prior art keywords
balloon
avalanche
injection nozzle
explosive mixture
inflation
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.)
Granted
Application number
EP20070731022
Other languages
German (de)
French (fr)
Other versions
EP1987290B1 (en
Inventor
Werner Greipl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technologie Alpine de Securite - TAS
Original Assignee
Technologie Alpine de Securite - TAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to FR0601648A priority Critical patent/FR2897931B1/en
Application filed by Technologie Alpine de Securite - TAS filed Critical Technologie Alpine de Securite - TAS
Priority to PCT/FR2007/000315 priority patent/WO2007096524A1/en
Publication of EP1987290A1 publication Critical patent/EP1987290A1/en
Application granted granted Critical
Publication of EP1987290B1 publication Critical patent/EP1987290B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D3/00Particular applications of blasting techniques

Abstract

The invention relates to an avalanche triggering system comprising a frame (4) fitted with means of attachment (5) for transporting the system, especially by helicopter with the aid of a cable (3), the frame (4) comprising, at the top, a storage area (6) for at least one gas container (7) designed to form an explosive mixture and, at the bottom, a holding system (8) for holding a plurality of balloons (9), each having an inflation sleeve and each being separated from the others, means (7, 13, 14) for conveying the explosive mixture to the inflation sleeve of a balloon (9), an injection nozzle (12), and means for igniting the explosive mixture, the balloon holding system (8) being mounted movably on the frame (4) to bring the inflation sleeve of each balloon (9) in succession up to the injection nozzle (12) and to the ignition means.

Description

 Avalanche triggering device

The invention relates to an avalanche triggering device for the protection of sites such as roads, ski slopes or agglomerations, particularly after heavy snowfall. There are a number of techniques for voluntarily triggering avalanches.

A first technique consists of having an explosive charge deposited by an operator on the slope where the avalanche is to be caused. The emplacement of the explosive in the slope can be carried out according to two methods, namely the launching and sliding of loads. As regards the charging of the charge, it is conventionally carried out using slow wick or electric.

This first technique presents a certain number of risks for the artificers. Indeed, their interventions are necessarily made during periods of high instability of the snowpack and in dangerous areas. They are then exposed to the risk of avalanche, not only during the preparation and the execution of the shot, but also during their movements to reach and leave the shooting range, that is to say the place of the preparation of the shot and firing the load. These risks are the main cause of accidents during trip operations.

Remote triggering techniques have been put in place to prevent firefighters from moving and parking at altitude in dangerous areas. The objective is to move the firing point away from the firing point, that is to say from the location of the firing at the moment of its explosion. A remote triggering device is known as CATEX. It is a carrier cable for bringing an explosive to a predetermined firing area and accessible by the carrier cable.

Such a solution, while limiting the risks for the operator, allows to trigger avalanches only in areas served by the cable. In addition, such a technological solution involves the transport and storage of explosives, which requires meeting strict security criteria. Finally, the installation of a long-distance carrier cable remains very expensive.

Another device is known as GAZEX. This is described in document FR 2,636,729. It comprises a closed-bottomed barrel having a front mouth open towards the snowpack. he further comprises a combustion gas supplying circuit and a fuel gas supplying circuit, the two gases coming from two separate sources. Nozzles for filling the barrel with these gases are arranged on various zones of the barrel and an ignition device is mounted at the rear of the latter. The explosive gas mixture, consisting for example of propane and oxygen, is formed in the barrel, the explosion being caused by the ignition device.

This device, although having proved effective, must be mounted in a fixed manner in the risk zone. It is therefore not transportable easily, which requires the mounting of a device on each firing zone.

US Pat. No. 4,873,928 describes a device for generating a shock wave by exploding an explosive gas contained in a balloon. The device comprises an expandable balloon, a device for filling the balloon with an explosive mixture of oxygen and hydrogen, and an ignition device for triggering the explosion.

The document EP 1 031 008 describes a similar device in which the balloon is simply fixed on a support, the tip turned downwards, so that during inflation, the balloon is directed upwards. The shock wave generated by the explosion of the balloon is transmitted in a small part to the snowpack because of the orientation of the explosion.

Such a device does not present a satisfactory result. Indeed, the balloon being fixed on a support and turned upwards, the explosion is directed for the most part upwards and laterally, the support having an obstacle to the movement of the wave between the balloon and the snowpack. In the same way as above, this remote triggering device is not transportable.

Other remote triggering techniques use military weapons. This is how the rocket launcher or the thrower is used, mainly in Switzerland, or that the anti-recoil gun or the shells launcher

LoCAT are used in the United States.

However, some legislations, and in particular French legislation, prohibit the storage of charged charges, making the use of such devices impossible. The invention therefore aims to remedy these drawbacks by proposing a transportable avalanche triggering device whose explosion is mainly directed towards the snowpack, requiring neither the transport nor the storage of explosive, and whose use is in conformity with the different national legislations.

For this purpose, the invention relates to a triggering device. avalanche device comprising a chassis equipped with attachment means for transporting the device, in particular by a helicopter using a rope, the chassis comprising, at the top, a storage area of at least one fuel tank; gas intended to form an explosive mixture and, in the lower part, a device for supporting a plurality of elastic balloons each having an inflation nozzle turned towards the upper part, the body of each balloon extending in the opposite direction, the balloons being offset relative to one another, means for feeding the explosive mixture facing the inflation nozzle of a balloon, an injection nozzle, means for igniting the explosive mixture, means being provided to successively bring the injection nozzle and the ignition means facing the inflation tip of each balloon.

The device can therefore be transported to different firing zones above the snowpack, in order to provoke an avalanche by exploding a balloon situated at the bottom of the device. The explosion is thus directed mostly towards the snowpack.

In addition, this device being equipped with several balloons, it is possible to perform a series of explosions, which allows either to guarantee the triggering of an avalanche since several successive shots are sometimes necessary, or to be able to trigger several avalanches in different areas, without having to recharge the device.

According to a first embodiment of the invention, the balloon support device is mounted movably on the frame to successively bring the inflation nozzle of each balloon facing the injection nozzle and ignition means.

According to a second embodiment of the invention, the injection nozzle and the ignition means are movably mounted on the frame to come successively opposite the inflation nozzle of each balloon. According to a feature relating to the first embodiment, the balloon support device is formed by a cylinder pivotally mounted on the frame.

The simple rotation of the barrel and allows to change the positioning of the balloons and thus rearm the device to be able to perform a new explosion.

Advantageously, the chassis is equipped at its lower end with a cage open downwards for guiding and protecting the balloon during its inflation. The cage makes it possible to prevent the balloon from bursting by collision with the rest of the device when the balloon is set in motion by the device swing or because of the force exerted by the wind on the balloon.

Preferably, the guiding and protective cage is covered over at least part of its height and from its upper end, a frustoconical skirt.

The skirt helps guide the wave from the explosion down, so as to improve the transfer of energy from the explosion to the snowpack. It also participates in the protection of the various elements fitted to the chassis. According to one characteristic of the invention, the device comprises a camera for monitoring the avalanche and / or the balloon.

Thus, the operator can monitor the inflation and explosion of the balloon as well as the condition and movement of the snowpack.

Advantageously, the means for feeding the explosive mixture comprise reservoirs of the various gaseous components intended to form the explosive mixture, for example oxygen, hydrogen and / or propane, and a mixer intended to form the explosive mixture from gaseous components.

The gases used to make the explosive mixture are of low cost and require neither special storage and transport precautions, nor specific preparation.

Preferably, the balloons are latex balloons. They can also be formed by other elastic materials.

According to a further feature of the invention, the ignition means are means for producing a flame or a spark. Advantageously, the ignition means are integrated with the injection nozzle, so as to simplify the kinematics and the embodiment of the device.

Preferably, the injection nozzle is displaceable in translation between an inflation position in which the injection nozzle is connected to the tip of a balloon, and a withdrawal position in which the injection nozzle is disconnected from the nozzle. tip.

According to one characteristic of the invention, the balls are regularly distributed with an offset of an angle α of a balloon relative to the other, the cylinder being actuatable step by step in rotation by a multiple of the angle α .

The rotation step by step of the barrel makes it possible to make a quick and simple change of balloon.

Advantageously, the balloon support device, the explosive mixture feed means, the injection nozzle and the ignition means of the explosive mixture can be remotely actuated by control means.

In this way, an operator located at a distance from the device, for example placed inside the helicopter carrying it, can control the inflation and the explosion of a balloon as well as the recharging of the device.

In any case, the invention will be better understood from the description which follows, with reference to the appended schematic drawing showing, by way of non-limiting example, an embodiment of this avalanche triggering device.

Figure 1 is an overview of a helicopter carrying the device; Figure 2 is a perspective view of the device in a first state in which the balloon is not inflated;

Figure 3 is a view corresponding to Figure 2 showing a second state of the device in which the balloon is inflated;

Figure 4 is an enlarged front view of a portion of the device having a first step of disposing a first balloon;

Figure 5 is a view corresponding to Figure 4 and having a second step of inflation and ignition of the first balloon;

Figure 6 is a view corresponding to Figures 4 and 5 and having a third step of disposing a second balloon; FIG. 1 shows an avalanche triggering device 1 connected to a helicopter 2 by a rope 3 of length between 30 and 45 meters. The device is brought to the top of the snowpack at the firing zone.

Inside the helicopter 2 is an operator that can remotely actuate the device 1 by means of control means (not shown).

As shown in FIG. 2, this device 1 comprises a longitudinal chassis 4 of substantially cylindrical shape and equipped with attachment means 5 at a first end facing the helicopter 2. In a manner known per se, the clipping means are formed by a loop for receiving a hook or a carabiner disposed at one end of the rope 3.

This frame comprises, in the upper part, a storage area 6 of bottles 7 forming reservoirs of oxygen and hydrogen or propane. The bottles are preferably regularly distributed around the longitudinal axis XX of the frame 4 so as to balance the forces due to the weight of each bottle 7. The frame 4 comprises a cylinder 8 mounted pivotally about a YY axis parallel to the longitudinal axis XX of the frame 4 and offset laterally thereto. The barrel 8 comprises a plurality of enclosures 10 open at their two ends and in which are arranged the balloons 9 in the deflated state. The latter comprise inflation tips, the opening of the tips being directed upwards and coinciding with the upper opening 11 of the speakers 10 of the barrel 8.

The balloons 9 used are latex balloons and are clamped on the speakers 10, at their upper opening 11, so as to make a tight connection. Barrel 8 thus forms the support of a plurality of balloons 9 whose inflation tip is turned towards the upper part and whose body is turned on the opposite side so as to extend downwards during inflation.

The chassis 4 also comprises means for feeding an explosive mixture opposite the inflation nozzle of the corresponding balloon, an injection nozzle 12 for the explosive mixture and means for igniting the mixture (not shown).

The means for feeding the explosive mixture are formed by the oxygen or air bottles, the hydrogen or propane bottles and by a plurality of pipes 13 connecting each bottle to a mixer 14, the latter making it possible to carry out the explosive mixture. The mixture is then brought to the injection nozzle 12 which, as shown in Figures 6 to 8, performs the inflation of the balloon with the explosive mixture.

The ignition means of the explosive mixture can initiate the explosion phenomenon. They can be formed by means of producing a flame or a spark.

The frame 4 further comprises a guide and protection cage 15 of the balloon 9 at its end facing downwards, that is to say turned towards the snowpack, once the device 1 in the position of use. . As shown in Figure 3, the balloon 9 is guided during its inflation by the cage 15 of generally hemispherical shape and open downwards. The cage 15 has a diameter corresponding to that of the balloon once inflated, that is to say approximately equal to 1.5 meters. In addition to the guide function of the balloon, the cage makes it possible to ensure the protection thereof. Indeed, the rocking of the device 1 and the force exerted by the wind on the balloon 9 can cause a rocking of the latter and its bursting by collision with the device 1.

The guiding and protective cage 15 is covered over part of its height and from its upper end, a frustoconical skirt 16. This skirt 16 guides the waves from the explosion to the snowpack. It thus avoids a lateral dissipation of the energy of the explosion and makes it possible to increase the efficiency of the device. It also protects the elements on the chassis.

A camera 17 monitoring the avalanche and the balloon is disposed at the lower end of the device 1 and laterally relative to the frame 4. The camera 17 provides the operator with images of the balloon 9 to monitor its inflation and its explosion. It also allows the operator to visualize the snowpack, especially the area directly above the helicopter.

Figures 4 to 6 detail the process of inflation and explosion of the balloons 9.

FIG. 4 represents a first step in which a first chamber 10 of the barrel 8 is arranged so that the corresponding upper opening 11, and therefore also the tip of the balloon 9, is arranged in the longitudinal axis of the nozzle injection 12, this axis corresponding to the longitudinal axis XX of the chassis 4. The injection nozzle 12 is in the upper position during this first step. During the second step, represented in FIG. 5, the injection nozzle 12 is displaced in translation in the direction of the upper opening

11 of the enclosure 10. The injection nozzle 12 is then mounted sealingly on the nozzle, so as to ensure the inflation of the balloon 9 with the explosive gas mixture.

The increase of the volume of the balloon pushes the latter to be partially extracted by the lower opening of the corresponding chamber 10, so as to be housed in the guide and protection cage 15.

The ignition means (not shown) are integrated with the injection nozzle 12, so that the ignition can be carried out directly after the inflation step of the balloon. The ignition means causing the explosion of the balloon 9, shock waves from the explosion then affect the snowpack.

After the explosion, the injection nozzle 12 is removed from the upper opening 11 of the first chamber and the barrel 8 is actuated in rotation by an angle α corresponding to the angular offset of the balloons relative to each other. The barrel is thus actuable in steps so as to arrange the upper opening of a second chamber, directly adjacent to the first, in the axis XX of displacement of the injection nozzle 12 and the ignition means, so that a second balloon contained in the second chamber can be inflated.

The barrel 8 may for example comprise 11 balls so as to be able to perform as many consecutive explosions without the need to recharge the device, the bottles 7 forming a gas tank being dimensioned so as to allow the inflation of all the balloons 9 of the barrel 8.

The avalanche triggering device further comprises control means (not shown) of the balloon support device, means for feeding the explosive mixture, the injection nozzle 12 and means for igniting the explosive mixture. These control means comprise a control box providing an interface for the operator, this box making it possible in particular to control the inflation and explosion operations, either separately or automatically, for example by means of an inflation timer. . They further comprise wireless connection means between the various actuators of the device and the control unit disposed inside the helicopter. These means of Wireless links are for example formed by a radio transmitter and receiver.

As goes without saying, the invention is not limited to the embodiments of this system, described above by way of example, but it encompasses all variants. Thus, the device for supporting the balloons could be in the form of a slide, the balloons being evenly distributed on the slide and spaced apart by a distance d, the slide being displaceable by not in translation by a distance d , so that the slide allows to successively bring the inflation nozzle of each balloon facing the injection nozzle and ignition means. It is thus also that the ignition means can be separated from the injection nozzle, the explosive mixture can be of different composition, the barrel is not necessarily actuable step, the frustoconical skirt can also form the guiding and protective cage of the balloon or the support device is fixed relative to the chassis, the injection nozzle and the ignition means being adapted to successively bring the inflation tip of each balloon facing the injection nozzle and ignition means.

Claims

1. An avalanche triggering device (1) comprising a chassis (4) equipped with hooking means (5) for transporting the device (1), in particular by a helicopter (2) using a rope (3), the frame (4) comprising, in the upper part, a storage area (6) of at least one gas tank (7) intended to form an explosive mixture and, at the bottom, a support device ( 8) of a plurality of elastic balloons (9) each having an inflation nozzle turned towards the upper part, the body of each balloon extending in the opposite direction, the balloons being offset with respect to one another, means supplying the explosive mixture (7, 13, 14) facing the inflation nozzle of a balloon (9), an injection nozzle (12), means for igniting the explosive mixture,
 means being provided for successively bringing the injection nozzle (12) and the ignition means facing the inflation nozzle of each balloon (9).
2. Avalanche triggering device according to claim 1, characterized in that the support device (8) of balloons (9) is movably mounted on the frame (4) to successively bring the inflation tip of each balloon ( 9) opposite the injection nozzle (12) and ignition means.
3. Avalanche triggering device according to claim 1, characterized in that the injection nozzle (12) and the ignition means are movably mounted on the frame (4) to come successively opposite the nozzle of inflating each balloon (9).
4. Avalanche triggering device according to one of claims 1 and 2, characterized in that the balloon support device is formed by a cylinder (8) pivotally mounted on the frame (4).
5. Avalanche release device according to one of claims 1 to 4, characterized in that the frame (4) is equipped at its lower end with a cage (15) open downwards for guiding and protection of the balloon (9) during its inflation. 6. Avalanche triggering device according to the claim
5, characterized in that the cage (15) for guiding and protecting is covered over at least part of its height and from its upper end, a frustoconical skirt (16).
7. Avalanche triggering device according to one of claims 1 to 6, characterized in that it comprises a surveillance camera (17) of the avalanche and / or the balloon.
8. Avalanche release device according to one of claims 1 to 7, characterized in that the means for supplying the explosive mixture comprise reservoirs of the various gaseous components for forming the explosive mixture, for example oxygen, hydrogen and / or propane, and a mixer (14) for forming the explosive mixture from the gaseous components.
9. avalanche triggering device according to one of claims 1 to 8, characterized in that the balloons (9) are latex balloons. 10. Avalanche triggering device according to one of claims 1 to 9, characterized in that the ignition means are means for producing a flame or a spark.
11. Avalanche triggering device according to one of claims 1 to 10, characterized in that the ignition means are integrated with the injection nozzle (12).
12. Avalanche release device according to one of claims 1 to 11, characterized in that the injection nozzle (12) is displaceable in translation between an inflation position in which the injection nozzle (12) is connected to the tip of a balloon (9), and a withdrawal position in which the injection nozzle (12) is disconnected from the tip.
13. Avalanche release device according to one of claims 4 to 12, characterized in that the balloons (9) are regularly distributed and offset relative to each other by an angle [alpha], the barrel (8) being operable step by step in rotation of a multiple of the angle [alpha]. Avalanche release device according to one of Claims 1 to 13, characterized in that the balloon support device (8), the feed means (7, 13, 14) for the explosive mixture, the nozzle injection (12) and the ignition means of the explosive mixture are remotely operable by control means.
EP20070731022 2006-02-24 2007-02-21 Avalanche triggering system Expired - Fee Related EP1987290B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0601648A FR2897931B1 (en) 2006-02-24 2006-02-24 Avalanche release device
PCT/FR2007/000315 WO2007096524A1 (en) 2006-02-24 2007-02-21 Avalanche triggering system

Publications (2)

Publication Number Publication Date
EP1987290A1 true EP1987290A1 (en) 2008-11-05
EP1987290B1 EP1987290B1 (en) 2010-03-31

Family

ID=37103190

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070731022 Expired - Fee Related EP1987290B1 (en) 2006-02-24 2007-02-21 Avalanche triggering system

Country Status (7)

Country Link
US (1) US8342096B2 (en)
EP (1) EP1987290B1 (en)
AT (1) AT462934T (en)
DE (1) DE602007005613D1 (en)
ES (1) ES2343213T3 (en)
FR (1) FR2897931B1 (en)
WO (1) WO2007096524A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2897931B1 (en) * 2006-02-24 2008-05-09 Technologie Alpine De Securite Avalanche release device
FR2925152B1 (en) * 2007-12-14 2013-06-28 Technologie Alpine De Securite T A S Device for triggering avalanches
DE102009061084B4 (en) * 2009-08-18 2018-06-21 Geräte- und Vorrichtungsbau Spitzner OHG Device for cleaning well systems
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
EP2823858A1 (en) * 2013-07-12 2015-01-14 Brossel, Rémy System generating a constraint field, and medical device implementing the same
RU2627393C1 (en) * 2016-08-12 2017-08-08 Общество с ограниченной ответственностью "Глобал Майнинг Эксплозив - Раша" Charge of explosive substance for projectiles, method of preparation of this charge and projectile with explosive substance (options)

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US4873928A (en) 1987-06-15 1989-10-17 Apti, Inc. Nuclear-sized explosions without radiation
CH675023A5 (en) * 1988-01-12 1990-08-15 Zermatt Air Ag
AR245818A1 (en) * 1988-03-03 1994-02-28 Schippers Jacob Process and device for triggering an avalanche
FR2636729B1 (en) 1988-09-19 1990-12-07 Schippers Jacob Method and device for triggering an avalanche
DE4302252C1 (en) * 1992-02-24 1993-09-09 Franz 82467 Garmisch-Partenkirchen De Wendl System for artificially triggering snow avalanches from helicopter - involves lowering explosive means from helicopter by special electrical cable with load reception housing, distance holder and detonator.
EP0690285A1 (en) * 1994-06-29 1996-01-03 Air Zermatt Method and device for starting snow slides by means of explosives
FR2771168B1 (en) 1997-11-17 1999-12-10 Commissariat Energie Atomique METHOD OF ARTIFICIAL TRIGGERING OF AN AVALANCHE AND DEVICE FOR CARRYING OUT SAID METHOD
IT1311085B1 (en) * 1999-03-11 2002-02-28 Monterosa S P A Device and method for artificially causing an avalanche
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US7707938B2 (en) * 2005-05-16 2010-05-04 Hisel Stanley D Apparatus and method for avalanche control
FR2897931B1 (en) * 2006-02-24 2008-05-09 Technologie Alpine De Securite Avalanche release device
FR2925152B1 (en) * 2007-12-14 2013-06-28 Technologie Alpine De Securite T A S Device for triggering avalanches

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Also Published As

Publication number Publication date
AT462934T (en) 2010-04-15
US8342096B2 (en) 2013-01-01
DE602007005613D1 (en) 2010-05-12
FR2897931B1 (en) 2008-05-09
FR2897931A1 (en) 2007-08-31
ES2343213T3 (en) 2010-07-26
US20110005423A1 (en) 2011-01-13
WO2007096524A1 (en) 2007-08-30
EP1987290B1 (en) 2010-03-31

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