Abstract: The present invention concerns a roadway widening structure (1) comprising: a first portion (10) intended to bear on a support intended to support a first portion of the roadway, and a cantilevered second portion (20) secured to the first portion by a lateral wall (18, 25) and intended to support a second portion of the roadway.

Abstract: Device for setting off an avalanche, comprising a support intended to be fixed to the mounting side, for example on a concrete slab, and an enclosure one end of which is open, this enclosure being mounted on the support, said open end of the enclosure being intended to face towards the snow cap. The device further comprises means of filling the enclosure with an explosive gaseous mixture, firing means designed to set off the explosion of the said mixture and a remote-communication system. The enclosure is mounted removably on the support, by fitting its lower face, intended to receive the gaseous mixture, onto a bearing piece of the support, and the enclosure is autonomous in terms of energy supply and carries means of storing the gases that are intended to form the gaseous mixture.

Abstract: Device for setting off an avalanche, comprising a support intended to be fixed to the mounting side, for example on a concrete slab, and an enclosure one end of which is open, this enclosure being mounted on the support, said open end of the enclosure being intended to face towards the snow cap. The device further comprises means of filling the enclosure with an explosive gaseous mixture, firing means designed to set off the explosion of the said mixture and a remote-communication system. The enclosure is mounted removably on the support, by fitting its lower face, intended to receive the gaseous mixture, onto a bearing piece of the support, and the enclosure is autonomous in terms of energy supply and carries means of storing the gases that are intended to form the gaseous mixture.

Abstract: The invention relates to an avalanche triggering device comprising at least one enclosure (4) for confining an explosive gas mixture, having a downward-facing opening and being equipped with gas supply means (15, 16) designed to at least partly fill the volume defined by the enclosure (4) with the explosive gas mixture at a density less than that of the air, the device also comprising means (14) for igniting this mixture; which device is characterized in that the enclosure (4) is in the general shape of a bell or frustoconical shape with an approximately vertical axis.

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.

Abstract: Said device comprises a tube (1), one closed end of which is mounted onto a holder (5), for example a concrete mass (6), that is itself attached to a mountainside (7). The other open end (2) of said tube is rotated toward the snow cover (3). The device also comprises a means (8) for filling the tube (1) with an explosive gas mixture and moreover comprises a priming means that induces the explosion of said mixture. Said device is characterized in that it comprises at least two beams (9) that, each being attached by one of the ends thereof to the holder (5), extends along the tube (1) parallel thereto so as to ensure the holding thereof while forming a means for absorbing the movement of the tube (1) following the gas mixture explosion.

Abstract: The invention relates to an avalanche triggering device comprising at least one enclosure (4) for confining an explosive gas mixture, having a downward-facing opening and being equipped with gas supply means (15, 16) designed to at least partly fill the volume defined by the enclosure (4) with the explosive gas mixture at a density less than that of the air, the device also comprising means (14) for igniting this mixture; which device is characterized in that the enclosure (4) is in the general shape of a bell or frustoconical shape with an approximately vertical axis.

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.