An Air Barrier Device Used to Eliminate Shock Waves of Underwater Proximity Blasting

Abstract

The invention provides an air buffer device used for eliminating underwater near-distance explosion shock waves. The air buffer device comprises a counterweight, a gas ejector pipe, a maze type bubble channel and a flexible gasbag, wherein both the lower end and the upper end of the maze type bubble channel are open; the lower end of the maze type bubble channel is fixedly arranged on the gas ejector pipe, and the upper portion of the maze type bubble channel is connected with the flexible gasbag; the gas ejector pipe is connected with the counterweight; a gas ejecting hole of the gas ejector pipe is positioned inside the maze type bubble channel; and floating force, generated in water, of the flexible gasbag is greater than gravity, borne in water, of the maze type bubble channel. According to the air buffer device provided by the invention, air buffers which are staggered front and rear are formed in the vertical direction, and sudden change of wave impedance between an air medium and a surrounding water medium is utilized, so that a pressure peak value of shock waves can be attenuated by 90% or more, and therefore, safety of nearby hydraulic structures and other protected targets is protected, and the air buffer device has the advantages of being good in energy dissipation effect, energy-saving, environmentally friendly, and the like.

Description

technical field [0001] The invention belongs to the technical field of underwater blasting shock wave protection devices, specifically an air barrier device for eliminating short-distance underwater blasting shock waves, which can be used to protect hydraulic structures and other protected targets in adjacent waters. Hazard from underwater blasting shock waves. Background technique [0002] In recent years, the number of underwater blasting projects such as cofferdam demolition and underwater foundation excavation has been increasing. At the same time, in actual projects, especially in machine expansion projects, in order to control the budget and reduce the amount of excavation, the reserved rock sill is often close to the newly-built intake gate. Therefore, the protection of short-distance underwater blasting shock waves has been paid more and more attention. [0003] In the protection of underwater shock waves, the bubble curtain technology is widely used at present. T...

AI Technical Summary

Problems solved by technology

However, the bubble curtain has the following disadvantages: (1) Since the peak pressure of the shock wave rises rapidly at a short distance from the explosion center, the high-frequency part accounts for a large proportion, and the attenuation effect of the bubble curtain on the energy of the low-frequency and high-frequency parts of the shock wave is not ideal. Therefore, the bubble curtain technology is not suitable for the elimination and protection of short-distance underwater blasting shock waves; (2) The bubbles in the bubble curtain gradually disperse during the rising process, and the width of the bubble curtain on the water surface is 6~9 Therefore, in order to ensure the density and energy dissipation effect of the bubble curtain, multiple high-power air compressors are required to work at the same time during the construction process, resulting in high energy consumption

However, in actual engineering, due to the influence of buoyancy, it is difficult to directly arrange air bags or other forms of air barriers in a large area in the water, especially in the protection of deep water blasting engineering, the protection layout work is difficult to complete

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