Abstract: The device for retaining materials, includes a retaining structure configured to retain materials; a fastening assembly intended to be fastened to an upstream anchoring point and configured to connect the retaining structure to the upstream anchoring point, the fastening assembly comprising a plurality of connecting elements, each connecting element being flexible and elongate, and comprising a first end portion connected to the retaining structure and a second end portion intended to be connected to the upstream anchoring point; and at least one holding element configured to hold the retaining structure in position and comprising a first end portion connected to the retaining structure and a second end portion intended to be connected to a downstream anchoring point disposed downstream of the retaining structure.

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 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.