RU2112916C1 - Device for attenuation of underwater explosion shock waves - Google Patents

Abstract

FIELD: safety engineering at under- water blasting operations. SUBSTANCE: device is made in form of an air-water screen of waterproof shells filled with fragments of plants, mineral wool or mix of these materials. shells are placed in nets and furnished with ballast for adjustment of buoyancy. EFFECT: enhanced efficiency. 2 dwg

Description

 The invention relates to blasting and is intended to attenuate shock waves (HC) during underwater explosions.

 Known protection of engineering structures and fauna from the destructive and damaging effects of hydrocarbons by a curtain of air bubbles created by the bubbling of air from perforated pipes.

 Disadvantages of vertical veil bubbles: the impossibility of comprehensive localization by the screens of the explosion zone and the difficulty of application due to the need for a compressor with an energy source and a system of perforated pipes with hoses and fittings for air supply.

 The aim of the invention is the comprehensive localization of the source of an underwater explosion with screens created by technically simple means.

 To achieve this goal, a device for attenuating an HC of an underwater explosion containing a screen of air inclusions in water is characterized in that the air inclusions are formed by plant fragments (hay, wood shavings and sawdust, sphagnum moss), mineral wool (slag, glass wool) or a mixture these materials, surrounded by waterproof shells, and placed in nets with ballast to control buoyancy.

 The screens group around the explosion zone, stabilizing screens with positive buoyancy by anchors, and with negative buoyancy by floats. In FIG. Figures 1 and 2 show a screen diagram for localizing the explosion of a bottom charge, where the following notation is used: 1 - explosive charge, 2 - screens in the form of mats from low-density air-containing materials (plant fragments, mineral wool) in plastic films and nylon nets with loads 3 from grates, pipe rail sections or cobblestones.

 Screens connected by vertices form a dome in the form of a half cylinder above charge 1, and the sides are protected by vertical screens near the ends of the half cylinders.

 Ballast in the lower part of the screens stabilizes them around the explosion zone, and the positive buoyancy of low-density materials bonded to the ballast net gives the mats the vertical orientation necessary to localize the explosion at the bottom of the reservoir.

 Depending on the conditions of the explosion, the screens can be located in a horizontal position - to protect from the UV zone under a charge or over a charge. Screens with positive buoyancy are stabilized in horizontal position and in the required place by anchors, and screens with negative buoyancy are stabilized by floats.

 When using low-density materials from coarse elements: wood shavings, reeds, dry algae and sphagnum moss, polymer films can be damaged by punctures with a violation of tightness, and when air is displaced by water, the material loses its ability to shield HC. Such materials must be placed in cloth or kraft cellulose bags, and then protected from the penetration of water by polymer films.

 Due to the possible destruction of the screens and breakthroughs of the waterproofing shells after the explosion, the screens are removed to prevent clogging of the reservoir.

 With systematic underwater explosions conducted in a specific place, it is possible to use equipment from batteries of perforated pipes with a copressor and an energy source or delivery of reusable screens.

 The described device is intended for use when there is a sudden need to carry out blasting operations under water in the conditions of expeditionary work of geologists, in hydraulic construction, when piloting ships in ice. The device can be created in the field due to the possibility of manufacturing screens from commonly available low-density materials in sealed enclosures.

Claims (1)

 A device for attenuating shock waves of an underwater explosion, comprising a screen of inclusions of air in water, characterized in that the inclusions of air are formed by fragments of plants, mineral wool or a mixture of these materials, surrounded by waterproof shells and placed in nets with ballast to control buoyancy.

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