CN113074599A - High polymer broken stone protective device for eliminating near-field underwater blasting shock wave - Google Patents
High polymer broken stone protective device for eliminating near-field underwater blasting shock wave Download PDFInfo
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- CN113074599A CN113074599A CN202110298297.4A CN202110298297A CN113074599A CN 113074599 A CN113074599 A CN 113074599A CN 202110298297 A CN202110298297 A CN 202110298297A CN 113074599 A CN113074599 A CN 113074599A
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- high polymer
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- rubble
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D5/00—Safety arrangements
- F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
- F42D5/045—Detonation-wave absorbing or damping means
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Abstract
The invention relates to a high polymer broken stone protective device for eliminating underwater near-field blasting shock waves, which comprises high polymers, wire nets, broken stones and steel plates, wherein the broken stones are filled between the wire nets to form a protective body, then the high polymers are poured to form a protective mechanism, the steel plates are embedded in two sides of the protective mechanism, lifting lugs are formed at two ends of the steel plates extending out of the protective mechanism, and lifting holes are formed in the lifting lugs. The invention utilizes the sudden change of wave impedance between the high polymer gravel protection mechanism and the surrounding water medium and the diffuse reflection of shock waves by closed bubbles on the irregular surface of the gravel and in the high polymer material, has better weakening effect on the impulse and total energy of the shock waves, utilizes the wire netting to fix the gravel to improve the plastic deformation capability of the protection mechanism, can ensure that the protection mechanism does not break and fall off in the shock wave action process, and improves the effective action time in the shock wave protection process, thereby protecting the hydraulic structure and other protected targets in the adjacent water area from the damage of underwater explosion shock waves.
Description
Technical Field
The invention belongs to the technical field of disaster protection of blast waves of wading engineering, and particularly relates to a high polymer broken stone protection device for eliminating near-field underwater blast shock waves.
Background
In recent years, the number of underwater blasting projects such as cofferdam demolition, underwater foundation excavation and the like is increasing, and meanwhile, in actual projects, particularly hydropower station expansion projects, in order to control budget and reduce excavation amount, a reserved rock ridge is often close to a newly-built water inlet gate. Because of small water compressibility, large density and large sound velocity, the explosion shock wave generated by the explosion of explosives under water has the characteristics of large peak pressure, high impulse, strong destructiveness and the like, and therefore, the protection of the close-range underwater explosion shock wave is increasingly emphasized.
In the prior art, no good structural device is provided for the protection target of wading engineering to eliminate the harm of underwater blasting shock waves. The prior art widely applies the bubble curtain technology, namely arranging an air jet pipe or chemical drugs for generating a large amount of bubbles at the bottom of a building in the explosion-facing direction. Under the buoyancy effect of water, bubbles move from the water bottom to the water surface to form a bubble curtain, and part of shock wave energy is weakened through the diffuse reflection of water shock waves on the surfaces of the bubbles, so that the protective effect is achieved. However, the bubble curtain has the following disadvantages: (1) the bubble curtain does not have ideal attenuation effect on the energy of the low-frequency and high-frequency parts in the shock wave; (2) in order to ensure the density and the energy dissipation effect of the bubble curtain, a plurality of high-power air compressors are required to work simultaneously in the construction process, and the energy consumption is high. Therefore, a rapid, efficient and low-energy-consumption underwater near-field blasting shock wave protection device is needed.
Disclosure of Invention
The invention aims to provide a high polymer broken stone protective device for eliminating underwater near-field blasting shock waves, which can protect hydraulic structures and other protected targets in nearby water areas from being damaged by the underwater blasting shock waves.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a high polymer rubble protector for eliminating near field blasting shockwave under water, includes high polymer, parallel arrangement's wire netting, rubble and steel sheet, and it forms the protective body to fill the rubble that the dislocation was arranged between the wire netting, then pours the high polymer and forms protection mechanism, and protection mechanism's both sides are all pre-buried to have the steel sheet, and the both ends that stretch out protection mechanism's steel sheet form the lug, have seted up the hole for hoist on the lug, and the equipartition has circular hole on the steel sheet.
The particle size of the crushed stone is 2 cm-4 cm, and the specific surface area is 38 cm2/g~63 cm2/g。
The high polymer is formed by mixing and reacting isocyanate and polyalcohol according to the mass ratio of 1: 1, a formed high polymer material consolidation body is of a porous structure, dense closed bubbles are arranged inside the consolidation body, and the density of the formed high polymer material is 0.22 g/cm3~0.45 g/cm3。
The protection mechanism is cuboid, and the protection mechanism is 1-3 m long, 1-2 m wide and 6-15 cm thick.
The density of the protection mechanism is 1.05 g/cm3~1.2 g/cm3。
The thickness of the steel plate is 5-10 mm, and the width of the steel plate is 5-10 cm.
The invention utilizes the sudden change of wave impedance between the high polymer gravel protection mechanism and the surrounding water medium and the diffuse reflection of shock waves by closed bubbles on the irregular surface of the gravel and in the high polymer material, has better weakening effect on the impulse and the total energy of the shock waves, utilizes the wire netting to fix the gravel to improve the plastic deformation capability of the protection mechanism, can ensure that the protection mechanism does not break and fall off in the action process of the shock waves, ensures that the whole structure does not break and lose efficacy in the shock wave protection process, further improves the effective action time in the shock wave protection process, has obvious comprehensive energy dissipation effect, and can effectively attenuate more than 90 percent of the peak value of underwater blasting shock waves, thereby protecting hydraulic structures and other protected targets in the adjacent water area from the damage of the underwater blasting shock waves.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a sectional view taken along line A-A of example 1 in FIG. 1.
Fig. 3 is an enlarged structural diagram of a region B in fig. 2.
FIG. 4 is a sectional view taken along line A-A of example 2 of FIG. 1.
Fig. 5 is an enlarged schematic view of the region C in fig. 4.
FIG. 6 is a schematic diagram of the present invention in situ assembly and placement.
Fig. 7 is a schematic structural view of the underwater shock wave protection state of the present invention.
FIG. 8 is a schematic structural view of a steel sheet according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Example one
As shown in fig. 1-3, a high polymer broken stone protective device for eliminating underwater near field blasting shock waves comprises a high polymer 2, wire netting 4, broken stones 1 and steel plates 3 which are arranged in parallel, wherein the broken stones 1 are filled between the wire netting 4 to form a protective body, then the high polymer is poured to form a protective mechanism 7, the steel plates 3 are pre-buried at two sides of the protective mechanism 7, as shown in fig. 8, the steel plates 3 are thin steel plates with the thickness of 5-10 mm and the width of 5-10 cm, lifting lugs are formed at two ends of the steel plates 3 extending out of the protective mechanism, lifting holes 8 are formed in the lifting lugs, the steel plates are buried in the protective mechanism before pouring, bolts or ropes are adopted to assemble the invention through the lifting holes, so that the assembling and suspension arrangement are convenient, and the circular holes are uniformly distributed in the steel plates, so that the connection strength with the protective mechanism. During the concrete preparation, place the mould bottom in with most marginal wire netting 4, then lay one deck rubble, lay one deck wire netting again, so circulate for wire netting and rubble are alternately laid in layers, and the rubble passes through the wire netting and fixes, then pre-buried steel sheet, forms compound protection machanism through pouring the high polymer cementation at last, and this protection machanism is prefabricated before the engineering uses, erects protection machanism after prefabricating well again, can directly install fast when the engineering uses.
The high polymer is formed by mixing and reacting isocyanate and polyalcohol according to the mass ratio of 1: 1, the high polymer is developed rapidly within 35 s of high polymer pouring, and tends to be stable after the high polymer is poured for 10 min, and the formed high polymer material consolidation body is of a porous structure and is internally provided with a porous materialThe bubbles are densely sealed, and the density of the formed high polymer material is 0.22 g/cm3~0.45 g/cm3。
The protection mechanism is rectangular, the length of the protection mechanism is 1-3 m, the width of the protection mechanism is 1-2 m, the thickness of the protection mechanism is 6-15 cm, and the density of the protection mechanism is 1.05 g/cm3~1.2 g/cm3The gravity G borne by the protection mechanism is ensured to be larger than the buoyancy F borne by the whole structure in water, the integral density of the water-based floating-type water-based storage device is ensured to be larger than the density of water, the buoyancy of.
The crushed stone has irregular surface, large specific surface area and certain hardness, the particle size of the crushed stone is basically consistent, the surface is clean and free of attachment of impurities, the crushed stone of the embodiment is basalt crushed stone with rough interface, irregular surface with multiple edges and corners, large specific surface area and certain hardness, the particle size of the crushed stone is about 3 cm, and the specific surface area is about 47 cm2G, density of about 2.5 g/cm3。
When the protection device is used specifically, as shown in fig. 6 and 7, the protection device is arranged 1-6 m before a protected height target project, and the specific implementation process is as follows:
1. according to the practical situation, the height of a cofferdam needing blasting demolition, the planned water filling depth, the length of a structure needing protection and the distance from the cofferdam are determined, in the embodiment, the height of the cofferdam 9 is 12 m, the depth of a water body 10 needing planned water filling is 10 m, the nearest distance from a newly-built water inlet gate 12 to the cofferdam 9 is 14 m, the length of a protection mechanism in the embodiment is 3 m and the thickness of the protection mechanism is 10 cm due to the fact that water is relatively deep.
2. The arrangement position of the invention is determined according to the distance between the protected structure and the cofferdam, the invention is usually arranged 1 m-6 m before the protected structure, in the embodiment, the invention is arranged 2 m before the water inlet gate 12, the width of the water area is 12 m, and therefore, a protection mechanism with the width of 2 m is adopted in the embodiment. Therefore, the present embodiment requires a shielding mechanism 24 having a length of 3 m, a width of 2 m, and a thickness of 10 cm.
3. In this example, the crushed stone is selected to have a density of 2.5 g/cm3The basalt broken stone with rough interface and multiple edges and corners is selected from high polymerPolyisocyanate and polyether alcohol the ratio of 1: 1 proportion of mixed high molecular compound, 125 g/gun of high polymer grouting material, 13 t of common pebbles and 900 guns of high polymer grouting material, the high polymer gravel protective mechanism is prefabricated on site by adopting a mold support, and the density of the manufactured high polymer gravel protective mechanism is 1.1 g/cm3Ensuring that the water can sink into water by means of dead weight.
4. In the embodiment, 6 rows of the protection mechanisms are vertically arranged in front of the water inlet gate, and each row of the protection mechanisms are connected in series through a rope and suspended by a crane to sink into water.
The overall design density of this example was 1.1 g/cm3The integral density of the protection mechanism 7 is ensured to be larger than the density of the water body 10, the buoyancy of the water body 10 is utilized to the maximum extent to reduce the hoisting weight of the protection mechanism in water, the hoisting operation is convenient, part of blast shock waves 11 are destroyed and absorbed by the deformation of the high polymer broken stone protection mechanism under the blast impact, when the blast shock waves 11 reach the surface of the high polymer broken stone protection mechanism, due to the mismatching of wave impedance between the protection mechanism and the surrounding water body medium, part of the blast shock waves are reflected on the surface of the blast shock waves, and after being reflected on the surface, part of the blast shock waves are transmitted into the structure, in the process of transmitting the structure, the blast shock waves are subjected to diffuse reflection on the surfaces of irregular broken stones and internal closed bubbles 5, the propagation of the blast shock waves 11 in water-related engineering is further reflected and slowed down, meanwhile, the wire netting in the structure can improve the plastic deformation capability of the, the comprehensive energy dissipation effect is remarkable, and the peak value of the underwater blasting shock wave can be effectively attenuated by more than 90%, so that hydraulic structures and other protected targets in adjacent water areas are protected from being damaged by the underwater blasting shock wave.
Example two
As shown in FIGS. 4 and 5, the crushed stone of this example has a smooth surface, is approximately elliptical or circular, has a particle size of about 3 cm, and has a density of about 2.5 g/cm3The crushed stone 6 has basically consistent particle size, certain hardness, clean surface and no attachment of impurities.
Example implementation of this example the above example 1 was repeated.
The above description is of the best mode and is not intended to limit the invention in any way, and all simple modifications, equivalent variations and modifications of the above examples according to the technical spirit of the invention are within the scope of the invention.
Claims (6)
1. A high polymer rubble protector for eliminating underwater near field blasting shockwave is characterized in that: the wire netting, rubble and steel sheet including high polymer, parallel arrangement, it forms the protective body to fill the rubble that has the straggle to arrange between the wire netting, then pours the high polymer and forms protection machanism, and protection machanism's both sides are all pre-buried to have the steel sheet, and the both ends that stretch out protection machanism's steel sheet form the lug, have seted up the hole for hoist on the lug, and the equipartition has circular hole on the steel sheet.
2. The high polymer rubble shield for dissipating underwater near field blast shock waves of claim 1, wherein: the particle size of the crushed stone is 2 cm-4 cm, and the specific surface area is 38 cm2/g~63 cm2/g。
3. The high polymer rubble shield for dissipating underwater near field blast shock waves of claim 1, wherein: the high polymer is formed by mixing and reacting isocyanate and polyalcohol according to the mass ratio of 1: 1, a formed high polymer material consolidation body is of a porous structure, dense closed bubbles are arranged inside the consolidation body, and the density of the formed high polymer material is 0.22 g/cm3~0.45 g/cm3。
4. The high polymer rubble shield for dissipating underwater near field blast shock waves of claim 1, wherein: the protection mechanism is cuboid, and the protection mechanism is 1-3 m long, 1-2 m wide and 6-15 cm thick.
5. The high polymer rubble shield for dissipating underwater near field blast shock waves of claim 4, wherein: the density of the protection mechanism is 1.05 g/cm3~1.2 g/cm3。
6. The high polymer rubble shield for dissipating underwater near field blast shock waves of claim 1, wherein: the thickness of the steel plate is 5-10 mm, and the width of the steel plate is 5-10 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110298297.4A CN113074599B (en) | 2021-03-19 | 2021-03-19 | High polymer broken stone protective device for eliminating near-field underwater blasting shock wave |
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| CN202110298297.4A CN113074599B (en) | 2021-03-19 | 2021-03-19 | High polymer broken stone protective device for eliminating near-field underwater blasting shock wave |
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| CN113074599B CN113074599B (en) | 2022-06-28 |
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Citations (7)
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| RU2106598C1 (en) * | 1996-10-15 | 1998-03-10 | Георгий Анатольевич Басс | Device for attenuation of shock waves at underwater explosion |
| US20070163189A1 (en) * | 2004-03-11 | 2007-07-19 | Venegas Frank Jr | Explosion-absorbing panels and wall structures |
| CN107355026A (en) * | 2017-09-13 | 2017-11-17 | 沈阳建筑大学 | The shellproof blast wall of lightweight power consumption |
| CN107883824A (en) * | 2017-10-20 | 2018-04-06 | 武汉大学 | Underwater demolition blast protection device |
| CN111336876A (en) * | 2020-03-31 | 2020-06-26 | 山东科技大学 | Method for reducing damage of tunnel blasting shock waves and noise |
| CN211205070U (en) * | 2019-08-13 | 2020-08-07 | 中国铁建港航局集团有限公司 | Underwater blasting entity protection device |
| CN212673970U (en) * | 2020-07-28 | 2021-03-09 | 中铁北京工程局集团有限公司 | Protection device for tunnel blasting |
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2021
- 2021-03-19 CN CN202110298297.4A patent/CN113074599B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| RU2106598C1 (en) * | 1996-10-15 | 1998-03-10 | Георгий Анатольевич Басс | Device for attenuation of shock waves at underwater explosion |
| US20070163189A1 (en) * | 2004-03-11 | 2007-07-19 | Venegas Frank Jr | Explosion-absorbing panels and wall structures |
| CN107355026A (en) * | 2017-09-13 | 2017-11-17 | 沈阳建筑大学 | The shellproof blast wall of lightweight power consumption |
| CN107883824A (en) * | 2017-10-20 | 2018-04-06 | 武汉大学 | Underwater demolition blast protection device |
| CN211205070U (en) * | 2019-08-13 | 2020-08-07 | 中国铁建港航局集团有限公司 | Underwater blasting entity protection device |
| CN111336876A (en) * | 2020-03-31 | 2020-06-26 | 山东科技大学 | Method for reducing damage of tunnel blasting shock waves and noise |
| CN212673970U (en) * | 2020-07-28 | 2021-03-09 | 中铁北京工程局集团有限公司 | Protection device for tunnel blasting |
Non-Patent Citations (1)
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