Runner type explosion suppression isolation protection retaining wall based on angular profile

Abstract

The invention belongs to the technical field of explosion suppression protection, and discloses a runner type explosion suppression isolation protection retaining wall based on angular profiles, which comprises a concrete base and a protection grating, a mounting groove is formed in the concrete base, a base plate is arranged at the bottom of the mounting groove, the protection grating comprises a base and a top seat, the base is detachably arranged on the base plate, and the top seat is detachably arranged on the top seat. I-shaped profiles are arranged at the two ends between the base and the top seat respectively, two rows of angular profiles which are arranged in the length direction of the base plate at intervals are arranged in the middle between the base and the top seat, and openings of the two rows of angular profiles are opposite and are arranged in a staggered mode. The distance between every two adjacent angular profiles in the same row is smaller than the width of the bevel edge of each angular profile. The interactive structure is formed by the two rows of angular profiles, so that on one hand, explosion fragments generated by explosion can be resisted; on the other hand, multiple hindrances are made on the explosion shock wave propagation path, rapid dissipation of the total energy of the explosion shock waves is achieved, and therefore the explosion shock wave overpressure value and the explosion fireball heat radiation value are attenuated.

Description

Technical Field

[0001] This invention relates to the field of explosion suppression and protection technology, and in particular to a flow channel type explosion suppression and isolation protective barrier based on angular profiles. Background Technology

[0002] Hazardous flammable and explosive materials are highly sensitive; accidental friction, impact, static electricity, and other external stimuli during the production process can cause them to ignite and explode. To control the spread of accidental combustion and explosion accidents during the production of hazardous flammable and explosive materials and to reduce casualties and property damage, reinforced concrete protective structures are mostly used at production sites to protect against blast waves, fragments, and heat radiation.

[0003] However, reinforced concrete protective structures have long construction cycles, high costs, and are immovable. When it is necessary to carry out technological modifications or upgrades to production lines for hazardous flammable and explosive materials, modifications can only be made within the existing spatial layout of the reinforced concrete protective structure, severely restricting the process layout of the new production line. If the layout needs to be adjusted or the site space expanded, the original reinforced concrete protective structure must be demolished, and a new reinforced concrete protective structure must be constructed according to the new spatial layout. This greatly increases construction costs and time, significantly impacting the industrial layout. In addition, reinforced concrete protective structures are mostly connected to the main structure of the factory building under stress, making direct demolition difficult and challenging. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a flow channel type explosion suppression and isolation protective barrier based on angular profiles.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a flow channel type explosion-proof isolation and protective barrier based on angular profiles, comprising a pre-embedded concrete base and a protective grid, wherein an installation groove is provided in the concrete base, and a base plate is provided at the bottom of the installation groove; the protective grid comprises a base and a top plate arranged at intervals above and below, wherein the base is detachably mounted on the base plate; an I-beam is provided at each end of the base and the top plate, wherein the length direction of the I-beam is perpendicular to the surface of the base plate and the two side flanges of the two I-beams are parallel; two rows of angular profiles are arranged at intervals along the length direction of the base plate at the middle position between the base and the top plate, wherein the openings of the two rows of angular profiles are opposite and staggered, and the distance between two adjacent angular profiles in the same row is less than the width of the hypotenuse of the angular profile.

[0006] Furthermore, the protective grille includes a mother grille assembly and a daughter grille assembly. The mother grille assembly includes a first support plate and a first overlapping plate arranged parallel to each other on their surfaces. The width of the first overlapping plate is less than or equal to half the width of the first support plate and is arranged on one side of the first support plate. An I-beam is provided at each end of the first support plate and the first overlapping plate. The length direction of the I-beam is perpendicular to the surface of the base plate, and the two side flanges of the two I-beams are parallel to each other. A row of plates arranged along the length direction of the base plate is provided at the middle position between the first support plate and the first overlapping plate. The first angle steel is arranged at intervals, with its opening facing the inside of the first overlapping plate; the sub-grid assembly includes a second support plate and a second overlapping plate arranged parallel to each other on the plate surface, the width of the second overlapping plate being less than or equal to half of the second support plate and correspondingly arranged on one side of the second support plate, and a row of second angle steels arranged opposite to and staggered from the opening of the first angle steel is provided between the second support plate and the second overlapping plate, the sub-grid assembly is inserted into the mother grid assembly to form a protective grid, the first support plate and the second overlapping plate are attached to form a base, and the first overlapping plate and the second support plate are attached to form a top seat.

[0007] Furthermore, the I-beam has a first notch at the end near the first lap plate to avoid the first lap plate, and a second notch at the end near the first support plate to avoid the second lap plate.

[0008] Furthermore, the first support plate and the first overlapping plate are respectively provided with a row of first through holes and a second through hole corresponding to the first angle steel. The first support plate is provided with a row of third through holes that are centrally symmetrical with the first through holes on the side away from the first through holes. The base plate is provided with two rows of first screws corresponding to the first through holes and the third through holes. The second support plate is provided with a row of fourth through holes corresponding to the second through holes. The second overlapping plate is provided with a row of fifth through holes corresponding to the third through holes.

[0009] Furthermore, the first support plate has two sixth through holes spaced apart at both ends, the second overlapping plate has a seventh through hole corresponding to the sixth through hole, and the base plate has a second screw corresponding to the sixth through hole; the first overlapping plate has an eighth through hole at both ends, and the second support plate has a ninth through hole corresponding to the eighth through hole at both ends.

[0010] Furthermore, it also includes a cover plate for covering the mounting groove, the size of which is the same as the size of the mounting groove cavity, and two lifting holes are provided at each end of the cover plate.

[0011] Furthermore, the cover plate is a box-shaped structure with an open bottom, and several reinforcing ribs are arranged in a crisscross pattern inside the box-shaped cavity. The upper surface of the cover plate is flush with the upper surface of the mounting groove and the ground surface.

[0012] Furthermore, the concrete base includes a concrete base plate, the concrete base plate is provided with an installation base, the installation groove is opened in the installation base, and the bottom of the base plate is welded with anchor bars that are embedded in the installation base.

[0013] In summary, the present invention has the following beneficial effects:

[0014] 1. In this application, a concrete base is set up and pre-embedded in the foundation pit corresponding to the location where the protective retaining wall needs to be installed, ensuring the stability of the base and thus providing a solid bottom foundation for the protective grid, ensuring the stability of the protective grid under the impact of an explosion; the protective grid is detachably set in the base plate of the concrete base through the base, so that the entire protective grid can be disassembled. In this way, the existing protective retaining wall structure can be ignored during on-site modification, and the construction difficulty, construction cost and construction period of on-site modification are greatly reduced.

[0015] 2. In this application, a base, a top seat, I-beam profiles, and angled profiles are provided. The base, top seat, and the I-beam profiles at both ends form the overall frame of the protective grid. Two rows of angled profiles then form a protective wall. The openings of the two rows of angled profiles are opposite and staggered to form an interactive structure. This structure serves two purposes: firstly, it can resist explosive fragments generated by the explosion; secondly, it creates multiple obstacles along the propagation path of the explosion shock wave, progressively inducing mechanical instability in the high-pressure gas molecular fluid. This transforms the explosion shock wave from a Mach number-dominated, nearly inviscid fluid into a Reynolds number-dominated, viscous fluid, gradually forming a large amount of disordered turbulence during propagation within the flow channel. Ultimately, through viscous dissipation, internal energy is converted into heat and kinetic energy at the microscopic scale, achieving rapid and efficient dissipation of the total energy of the explosion shock wave, thereby attenuating the overpressure value of the explosion shock wave and the thermal radiation value of the explosion fireball.

[0016] 3. In this application, a mother grid assembly and a sub-grid assembly are set up. The protective grid is formed by splicing the mother grid assembly and the sub-grid assembly. This can reduce the weight of a single grid assembly, making it easier to produce and transport. During installation, the sub-grid assembly only needs to be inserted into the mother grid assembly in reverse and then tightened with bolts to complete the assembly. It is also convenient for disassembly and replacement later. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the protective grille according to an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional structural diagram of the protective grille according to an embodiment of the present invention;

[0020] Figure 4This is an exploded structural diagram of the protective grille according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the mother grid assembly according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the concrete base structure according to an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of the concrete base with cover plate according to an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the cover plate in an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram showing the angle at which the protective barrier can block the scattering of fragments according to an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram illustrating the constraint effect of the flow channel structure of the protective barrier wall on the shock wave according to an embodiment of the present invention;

[0027] Figure 11 This is a schematic diagram illustrating the evolution of the explosive shock wave being intercepted at the contact portion of the angled profile surface in an embodiment of the present invention;

[0028] Figure 12 This is a schematic diagram of the shock wave flowing around the corner of the flange of the angular profile according to an embodiment of the present invention;

[0029] Figure 13 This is a schematic diagram illustrating the evolution of the explosion shock wave entering the narrow opening upon encountering the lower angular profile flange in an embodiment of the present invention.

[0030] Figure 14 , 15 This is a schematic diagram illustrating the evolution of the explosive shock wave entering the straight flow channel between two rows of angular profiles according to an embodiment of the present invention.

[0031] Figure 16 This is a schematic diagram illustrating the evolution of the explosion shock wave propagating in a straight flow channel according to an embodiment of the present invention;

[0032] Figure 17 This is a schematic diagram illustrating the evolution of the shock wave entering a large space from a pipe, according to an embodiment of the present invention.

[0033] In the diagram: 10. Concrete base; 11. Mounting groove; 12. Base plate; 13. First screw; 14. Second screw; 15. Concrete base plate; 16. Mounting base; 20. Protective grille; 21. Base; 22. Top seat; 23. I-beam; 24. Angle profile; 25. Mother grille assembly; 251. First support plate; 252. First lap plate; 253. I-beam; 2531. First notch; 2532. Second notch ; 254, First angle steel; 255, First through hole; 256, Second through hole; 257, Third through hole; 258, Sixth through hole; 259, Eighth through hole; 26, Sub-grid assembly; 261, Second support plate; 262, Second lap plate; 263, Second angle steel; 264, Fourth through hole; 265, Fifth through hole; 266, Seventh through hole; 267, Ninth through hole; 30, Cover plate; 31, Lifting hole; 32, Reinforcing rib plate. Detailed Implementation

[0034] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] like Figure 1-17 As shown in the figure, this application discloses a flow channel type explosion suppression isolation and protective barrier based on angular profiles, including a concrete base 10, a protective grid 20 and a cover plate 30.

[0036] Specifically, the concrete base 10 is a pre-embedded reinforced concrete structure, which can be directly cast on-site or prefabricated in a factory and then embedded in the foundation pit corresponding to the location where the protective retaining wall needs to be installed. The concrete base 10 consists of two layers, including a concrete base slab 15 at the bottom, on which the installation base 16 is mounted. Both the concrete base slab 15 and the installation base 16 are constructed using ordinary C30 plain concrete reinforced with 8mm diameter HPB235 steel bars and 20mm diameter HRB335 steel bars. During construction, the top surface of the installation base 16 is flush with the factory floor level, and the area on the concrete base slab 15 outside the installation base 16 is filled with concrete or plain soil to ensure that the concrete base 10 is integrated with the factory floor and does not affect the factory layout.

[0037] An installation groove 11 is formed within the mounting base 16. The installation groove 11 can be pre-reserved during the pouring of the mounting base 16, avoiding the waste of manpower for later excavation. A base plate 12 is provided at the bottom of the installation groove 11 for connecting the protective grid 20. The base plate 12 is a 10mm thick steel plate. During the concrete pouring of the mounting base 16, anchor bars are welded to the bottom of the base plate 12 and embedded into the mounting base 16. The anchor bars can be HRB335 hook-shaped steel bars with a diameter of 18mm. The anchor bars allow the base plate 12 to overlap with the steel bars in the reinforced concrete foundation, thereby firmly fixing the base plate 12 in the installation groove 11 of the mounting base 16, ensuring the bottom stability of the protective grid 20 after installation.

[0038] The protective grille 20 includes a base 21 and a top seat 22 arranged at intervals. An I-beam 23 is positioned at each end of the base 21 and top seat 22. The length of the I-beam 23 is perpendicular to the surface of the base plate 12, and the side flanges of the two I-beams 23 are parallel. The upper and lower ends of the I-beams 23 are welded and fixed to the base 21 and top seat 22, thus forming the overall frame structure of the protective grille 20 together with the base 21 and top seat 22. The base 21 is detachably mounted on the base plate 12, allowing the entire protective grille 20 to be detachably mounted on the base plate 12 for easy disassembly and replacement. The I-beam 23 is made of steel, aluminum alloy, or other materials with sufficient strength, such as I-beam steel or I-beam aluminum, with an I-shaped cross-section.

[0039] Two rows of angled profiles 24 are arranged at intervals along the length of the base plate 12, positioned between the base 21 and the top plate 22. Each angled profile 24 is made of steel, aluminum alloy, or other materials with sufficient strength, such as angle steel or angle aluminum, and has an L-shaped cross-section. The openings of the two rows of angled profiles 24 are opposite to each other and staggered. The distance between two adjacent angled profiles 24 in the same row is less than the width of the hypotenuse of the angled profile 24. In this way, two rows of angular profiles 24 form a gapless protective surface on the vertical plane, which can be used to resist the explosive fragments generated by the explosion and attenuate the explosive shock wave and the explosive fireball. On the horizontal plane, a curved airflow channel is formed, thereby creating multiple obstacles in the propagation path of the explosive shock wave. This prevents the explosive shock wave from directly passing through the protective grid 20. Part of it is reflected back by the wave-facing surface of the protective grid 20, and part of it is continuously reflected and diffracted in the flow channel, so that the internal energy of the shock wave is greatly converted, thereby effectively dissipating the internal energy of the explosive shock wave that passes through the protective grid 20 and effectively attenuating the overpressure peak value of the explosive shock wave and the thermal radiation value of the explosive fireball.

[0040] Specifically, due to the staggered arrangement of the two rows of angular profiles 24, the flanges of the angular profiles 24 are misaligned, forming two layers of metal protection. In this embodiment, the protective barrier is generally installed 1m from the blast origin, capable of capturing and blocking blast fragments flying at angles from 0° to 25°, such as... Figure 9 As shown. At 25°, there are two penetration-resistant metal layers: the left flange of the first angled profile 24 and the rear flange of the left vertical frame I-beam 253. At 20°, there are two penetration-resistant metal layers: the left flange of the first angled profile 24 and the right flange of the second angled profile 24. At 15°, there are two penetration-resistant metal layers: the left flange of the first angled profile 24 and the right flange of the second angled profile 24. At 10°, there is one penetration-resistant metal layer. At 5°, there is one penetration-resistant metal layer.

[0041] However, due to the typical fragment size of hazardous flammable and explosive materials production equipment, the fragment size is generally 1cm×2cm to 5cm×10cm, and the thickness is 1cm to 4cm. The fragments have a large frontal area, and their penetration efficiency is generally lower than that of pre-formed fragments. Due to the characteristics of the fragment geometry, fragments cannot penetrate the "minimum protection layer" in a straight line; most will have their flight path affected by the first impact, subsequently colliding with the adjacent angular profile 24 flange (second impact). Therefore, at the most extreme dispersion angles of 5° and 10°, the actual number of penetration-resistant metal layers is two. Therefore, the minimum effective number of penetration-resistant metal layers in this explosion suppression isolation protective barrier is two, with each metal layer averaging approximately 6mm thick, or 12mm thick. Based on the calculation formula for the required thickness of the anti-penetration layer under the penetration of explosive fragments, a 12mm thick Q235 steel plate can protect against explosive fragments of typical steel equipment with dimensions of 3cm×3cm×5cm and a velocity of 430m / s. It can meet the anti-penetration protection requirements of accidental explosive fragments in the production process of general hazardous flammable and explosive materials.

[0042] When the blast shock wave enters the bend in the flow channel formed by the two rows of angular profiles 24 of the protective grid 20, it can be divided into 6 stages: ①→②→③→④→⑤→②, producing 5 types of phenomena, namely:

[0043] ① The contact part is intercepted, ② the flow around (diffraction), ③ the explosion shock wave encounters the lower angular profile 24 flange and enters the narrow opening, ④ it propagates in the straight flow channel, ⑤ it enters the large space from the flow channel, ② the flow around (diffraction), such as Figure 10 As shown.

[0044] The analysis is based on the stages of the explosion shock wave propagation within the flow channel structure as follows:

[0045] Phase ① The blast shock wave was intercepted at the contact point with the surface of the angled profile 24.

[0046] like Figure 11As shown, the incident blast shock wave contacts the rigid body surface (the 24th flange surface of the angled profile) and accumulates on the surface, forming a reflected shock wave that propagates in the direction of the incoming wave. Simultaneously, the incident shock wave front gradually advances towards the rigid body surface and continues to propagate horizontally along it. Some of the gas molecules on the reflected shock wave front, under the influence of a velocity difference created by a strong deflection force, move parallel to the rigid body surface and form a shear layer. Within this shear layer, laminar flow is disturbed by the velocity difference, forming vortices. Gas molecules within these vortices rub against each other, continuously converting internal energy into heat and kinetic energy, achieving localized energy dissipation. This gradually develops into a Mach rod wave, intersecting the incident and reflected waves at a three-wave point, and forming localized energy enhancement phenomena such as a three-wave point slip surface (shear surface) during propagation. During this process, a portion of the blast shock wave forms a reflected shock wave that propagates in the direction of the incoming wave, thus "diverting" the continuously propagating energy and achieving overall energy attenuation.

[0047] Phase 2: Diffraction

[0048] like Figure 12 As shown, the flow around the object consists of two parts:

[0049] 1) Propagation of reflected shock waves

[0050] The instant the incident shock wave leaves the corner of the flange of the angled profile 24, a diffracted shock wave and a shear layer are formed. As the diffracted shock wave continues to propagate downwards along the corner of the angled profile 24, a reflected shock wave is formed on the vertical surface of the corner of the angled profile 24, and simultaneously a rarefaction wave (rare region) is formed at the rear end of the diffracted shock wave. When the reflected shock wave diffuses into the rarefaction region, the propagation speed of the reflected shock wave front is attenuated due to the low gas density and pressure inside the rarefaction region. The internal energy of the gas molecules on the reflected shock wave front is gradually converted into kinetic and thermal energy to drive the continuous motion of the molecules in the low-density space. The thermal energy is absorbed and stored by the spatial molecules and the metal of the flow channel structure, slowly completing the entropy increase. The remaining kinetic energy causes the reflected shock wave to continue propagating. Therefore, the internal energy of the reflected shock wave is significantly attenuated.

[0051] 2) Vortex maintenance

[0052] Meanwhile, due to the presence of shear layers and boundary layers, clockwise vortices (eddies) will form at the corners of the angular profile 24 flanges. The eddies cause gas molecules to rotate continuously under their constraint and undergo interlayer shear. The friction between gas molecules will cause the kinetic energy of the gas molecules to be gradually converted into heat energy. The heat energy is absorbed and stored by the spatial molecules and the flow channel structure metal, slowly completing the entropy increase. The residual kinetic energy causes the surrounding shock wave to continue to propagate, and the energy of the surrounding shock wave is attenuated.

[0053] ③ The shock wave from the explosion enters the narrow opening upon encountering the lower angular profile's 24 flanges.

[0054] like Figure 13 As shown, after the surrounding shock wave passes through the first angular profile 24, it merges with the surrounding shock waves at the adjacent angular profile 24 to form a new incident wave. The incident wave continues to propagate towards the second angular profile 24, and upon contact with the second angular profile 24, a new round of reflection and merging occurs.

[0055] As the incident shock wave front, formed by a new round of reflection and convergence, propagates towards the direction of the first angular profile 24 (backwards), when it flows past the back of the flange of the first angular profile 24, a portion of the wavefront is forced into the straight flow channel formed by the first and second angular profiles 24 because its propagation angle is limited by the flange of the second angular profile 24. Figure 14 , 15 As shown. During this process, a portion of the wavefront is "reflected" back, continuing to propagate in the direction of the incoming wave. It continuously reflects and diffracts as a low-magnitude shock wave, with some energy forced to briefly "remain" within the structure, constantly diffusing and dissipating. Only a portion of the wavefront can enter the straight flow channel and continue propagating forward. Therefore, the overall energy of the blast shock wave is attenuated.

[0056] As the blast shock wave enters a confined space, it undergoes reflection, superposition, and vortex phenomena, resulting in localized energy enhancement but overall energy attenuation. This energy attenuation is primarily due to the following factors.

[0057] 1) Reflection mechanism: When a shock wave strikes a rigid wall at a certain angle, regular reflection occurs; as the incident angle increases or the wave becomes stronger, it transforms into Mach reflection, forming a stronger composite shock wave (Mach rod). In complex and narrow channels, these two types of reflection may occur alternately or simultaneously, resulting in local energy amplification.

[0058] 2) Chasing and Superposition: In curved or bifurcated flow channels, subsequent reflected waves may catch up with the previous main incident wavefront. Since shock waves are compression waves, the chasing and superposition of subsequent waves can cause a sudden increase in pressure, density, and particle velocity at the wavefront. This is similar to the "shock focusing" or "detonation focusing" effect in acoustics, resulting in local energy amplification.

[0059] 3) Reduction in Channel Cross-sectional Area: According to one-dimensional flow theory, under instantaneous impact, a boundary layer also exists on the channel wall. The thickness of the boundary layer reduces the cross-sectional area available for shock wave propagation. Since the shock wave is approximately a non-viscous fluid, its propagation within the channel primarily involves the retention of continuously entering gas molecules in the form of vortices. These briefly retained gas molecules collide and rub within the vortices, converting their internal energy into heat energy, which is then transferred to the metal channel structure. This results in localized energy dissipation along the shock wave propagation path and a reduction in the local gas molecule propagation velocity. This effect is somewhat similar to the boundary layer of a viscous fluid, reducing the effective diameter of the high-speed passage within the cross-section. When the shock wave enters a channel with a reduced cross-sectional area, the wave propagation velocity (particle velocity) increases to maintain mass conservation. This is similar in phenomenon to the acceleration of compressible fluids in a contracting tube, but the driving mechanism is wave dynamics rather than steady-state flow. Therefore, the instantaneous increase in local shock wave velocity observed in narrow sections is essentially a result of wave energy convergence and compression caused by geometric constraints—a localized intensification phenomenon.

[0060] 4) Wall friction and heat conduction (dissipation): The flow channel wall is a rough surface (not "smooth"). The high-speed airflow collides and rubs against the wall, directly converting part of the wave's kinetic energy into heat energy, thus achieving frictional dissipation. The high-temperature gas behind the wave exchanges heat with the wall, and the heat is absorbed and "stored" by the wall. This part of the energy is directly stripped from the wave's energy.

[0061] 5) Energy dissipation in the rarefaction region: When a shock wave bypasses a corner or passes through a narrow opening, the wavefront rapidly expands outwards. This expansion generates a series of expansion waves (i.e., the high-pressure medium accelerates towards the explosion center under the action of the pressure gradient force, also known as rarefaction waves). When the reflected shock wave catches up with the initial incident shock wave, it must pass through the low-pressure region of the rarefaction wave (rare region). After the wavefront of the reflected shock wave invades the low-pressure, low-density rarefaction region, it causes a decrease in the pressure and velocity of the wavefront of the reflected shock wave. That is, the rarefaction wave "dilutes" and "disperses" the energy of the reflected wave, resulting in energy dissipation.

[0062] Stage 4: The explosion shock wave propagates in the straight flow channel.

[0063] like Figure 16As shown, before the shock wave propagates within the straight pipe, it is induced by multiple obstacles, causing mechanical instability in the high-pressure gas molecules. This transforms the explosion shock wave from an approximately inviscid fluid dominated by the Mach number into a viscous fluid dominated by the Reynolds number. When a viscous fluid propagates within a confined space, it is affected by the Reynolds number, forming a boundary layer on the surface of the wall along the propagation path. The formation of the boundary layer reduces the diameter of the flow channel within the confined space, increasing the velocity and pressure of the gas molecules during propagation. Although the reduction in the cross-sectional area of ​​the flow channel has a relatively weak attenuation effect on the shock wave, the friction between the high-pressure gas molecules and the wall converts some of the internal energy into heat energy. This heat energy is conducted to the metal material of the flow channel for "storage," while simultaneously causing a high-frequency vibration response in the flow channel structure, thus dissipating the energy.

[0064] Phase 5: The blast shockwave enters the large space through the pipes.

[0065] like Figure 17 As shown, during the propagation of a shock wave from a pipe into a large space, the moment the wavefront bursts out of the narrow channel and enters the large space, the shock wave front rapidly expands from a small cross-section, causing a sharp drop in energy density per unit area. The wavefront area increases while the energy density is diluted. Simultaneously, the moment the locally intensified shock wave bursts out of the narrow channel and enters the large space, the presence of a shear layer and rarefaction waves (rare regions) causes shearing and torsion between the high-pressure region and the rarefaction region (low-pressure region) under the force couple of shear force and rarefaction wave impact force (opposite directions), creating a velocity difference and thus disturbing the laminar flow to form vortices. Since the shear force is greater than the rarefaction wave impact force, and the rarefaction region extends as the shock wave front develops, vortices are continuously generated and, under shear impact, detach from the vortex bed (the narrow channel port) and continue propagating along the shock wave direction. During this process, the internal energy of the shock wave is converted into heat energy and conducted to the flow channel metal material and the undisturbed low-pressure air at the front end for "storage," while simultaneously causing high-frequency vibration response in the flow channel structure, thus dissipating energy.

[0066] Therefore, when an explosion occurs, the shock wave enters the flow channel of the protective grid 20 and propagates through 6 stages, which prolongs the propagation distance and duration of the shock wave, causing the energy of the shock wave to be greatly attenuated, thereby achieving the expected protective effect.

[0067] Further configuration: the protective grille 20 includes a mother grille assembly 25 and a daughter grille assembly 26. The mother grille assembly 25 includes a first support plate 251 and a first overlapping plate 252 arranged parallel to each other. The first support plate 251 is made of 10mm thick wide steel plate, and the first overlapping plate 252 is made of 10mm thick narrow steel plate. The width of the first overlapping plate 252 is less than or equal to half the width of the first support plate 251 and is arranged on one side of the first support plate 251. An I-beam 253 is provided at each end between the first support plate 251 and the first overlapping plate 252. The I-beams 253 are made of I14 hot-rolled ordinary I-beams of grade Q235. The length direction of the I-beams 253 is perpendicular to the surface of the base plate 12, and the two side flanges of the two I-beams 253 are parallel to each other. The two I-beams 253 serve as end supports to ensure the overall strength of the mother grille assembly 25. A row of first angle steels 254, spaced apart along the length of the base plate 12, is arranged in the middle between the first support plate 251 and the first overlapping plate 252. The first angle steels 254 are made of hot-rolled ordinary equilateral angle steel of grade Q235 (∟63×6), and the opening of the first angle steels 254 faces the inside of the first overlapping plate 252. The upper and lower ends of the I-beam 253 and the first angle steels 254 are welded and fixed to the corresponding first support plate 251 and first overlapping plate 252.

[0068] The sub-grid assembly 26 includes a second support plate 261 and a second overlapping plate 262 arranged parallel to each other on the plate surface. The width of the second overlapping plate 262 is less than or equal to half that of the second support plate 261 and is arranged on one side of the second support plate 261. The second support plate 261 is made of 10mm thick wide steel plate, and its dimensions are the same as those of the first support plate 251. The second overlapping plate 262 is made of 10mm thick narrow steel plate, and its dimensions are the same as those of the first overlapping plate 252. A row of second angle steels 263 is provided between the second support plate 261 and the second overlapping plate 262, which is opposite to and staggered from the opening of the first angle steel 254. The second angle steels 263 are made of ∟63×6 hot-rolled ordinary equal-leg angle steel of grade Q235, and their length is the same as that of the first angle steel 254.

[0069] During installation, the sub-grid assembly 26 is rotated vertically so that the second support plate 261 faces upward and the second overlapping plate 262 faces downward. It is then horizontally inserted into the mother grid assembly 25 to form a protective grid 20. After insertion, the first support plate 251 and the second overlapping plate 262 fit together to form a base 21, and the first overlapping plate 252 and the second support plate 261 fit together to form a top seat 22. The first support plate 251 and the second overlapping plate 262, as well as the first overlapping plate 252 and the second support plate 261, are fixed with bolts for easy disassembly and replacement later. To ensure the compactness of the overall structure after the mother grid assembly 25 and the sub-grid assembly 26 are assembled, a first notch 2531 is provided at the end of the I-beam 253 near the first overlapping plate 252 to avoid the first overlapping plate 252. The first overlapping plate 252 is positioned within the first notch 2531. A second notch 2532 is provided at one end of the I-beam 253 near the first support plate 251 to avoid the second overlapping plate 262. During assembly, the second overlapping plate 262 is inserted into the second notch 2532. In this way, the first notch 2531 and the second notch 2532 are used to accommodate the first overlapping plate 252 and the second overlapping plate 262, respectively, so that the upper and lower ends of the protective grille 20 are tightly connected after splicing.

[0070] In a specific configuration, a row of first through holes 255 and a row of second through holes 256, corresponding to the first angle steel 254, are respectively opened on the first support plate 251 and the first overlapping plate 252. A row of third through holes 257, which are centrally symmetrical to the first through holes 255, is opened on the side of the first support plate 251 away from the first through holes 255, with the center of symmetry being the center point of the first support plate 251. A row of fourth through holes 264, corresponding to the second through holes 256, is opened on the second support plate 261, and a row of fifth through holes 265, corresponding to the third through holes 257, is opened on the second overlapping plate 262. Two rows of first screws 13 are provided on the base plate 12 corresponding to the first through holes 255 and the third through holes 257. During installation, first, insert the sub-grid assembly 26 horizontally into the mother grid assembly 25 to form a protective grid 20. Then, align the fifth through hole 265 on the second support plate 261 of the sub-grid assembly 26 with the second through hole 256 on the first overlapping plate 252 of the mother grid assembly 25 and connect them using M24 bolts. Next, lift the protective grid 20 and insert it into the mounting groove 11, aligning the first through hole 255 and the third through hole 257 on the first support plate 251 with the first screw 13 on the base plate 12, and the second overlapping plate 262... After aligning the fourth through hole 264 on the substrate 12 with the corresponding first screw 13, the protective grille 20 is lowered, allowing the first support plate 251 to fit against the substrate 12. Then, a nut is screwed onto the end of the first screw 13. Finally, the M24 nut and M24 bolt are tightened to secure the grille, thus connecting the first support plate 251 and the second overlapping plate 262 to form the base 21 of the protective grille 20 and fixing it to the substrate 12. The first overlapping plate 252 and the second support plate 261 are also connected to form the top seat 22 of the protective grille 20. This allows the mother grille assembly 25 and the daughter grille assembly 26 to be spliced ​​together to form the protective grille 20, which is then detachably fixed to the substrate 12. By using two sets of grille assemblies to splice the protective grille 20, the weight of each set can be controlled to within 200kg, allowing for easy handling by three people. When performing horizontal assembly, a small, liftable gantry crane or a small hoist can be used. The assembly of two sets of grids can be completed within 20 minutes, significantly shortening construction time and reducing construction difficulty and complexity. Subsequent disassembly and replacement only require unscrewing the bolts, making disassembly and replacement convenient.

[0071] To further ensure the firmness of the connection between the protective grille 20 and the base plate 12, two sixth through holes 258 are spaced apart at both ends of the first support plate 251. A seventh through hole 266 is provided on the second overlapping plate 262 corresponding to the sixth through holes 258. A second screw 14 is provided on the base plate 12 corresponding to the sixth through holes 258. The sixth through holes 258 and the seventh through holes 266 are respectively fitted onto the corresponding second screws 14, and then tightened with nuts, thereby ensuring the connection between the two sides of the protective grille 20 and the base plate 12, further enhancing the connection stability. Eighth through holes 259 are provided at both ends of the first overlapping plate 252, and ninth through holes 267 are provided at both ends of the second support plate 261 corresponding to the eighth through holes 259. After aligning the ninth through holes 267 with the corresponding eighth through holes 259, they are connected with M24 bolts to ensure the tightness of the connection between the mother grille assembly 25 and the daughter grille assembly 26. Both the first screw 13 and the second screw 14 are M24 ordinary high-strength screws to ensure connection strength.

[0072] The cover plate 30 is used to cover the mounting groove 11. The size of the cover plate 30 is the same as the size of the groove 11, and the upper surface of the cover plate 30 is flush with the upper surface of the mounting groove 11 and the ground surface. When the plant process is adjusted so that the protective barrier is no longer needed in the original location, the protective grid 20 can be removed, and then the cover plate 30 can be placed in the mounting groove 11 to ensure that the base is flush with the ground. When the protective barrier needs to be redeployed, the cover plate 30 can be opened and the protective grid 20 can be installed. The cover plate 30 is a box-shaped structure with an open bottom. Several reinforcing ribs 32 are arranged in a crisscross pattern inside the box-shaped cavity. It can be made of high-strength conductive rubber material and integrally injection molded to ensure that the cover plate 30 has sufficient strength. To facilitate the installation and hoisting of the cover plate 30, two hoisting holes 31 are opened at each end of the cover plate 30. The lifting hole 31 is a countersunk bolt hole. After the cover plate 30 is installed in the mounting groove 11, the lifting hole 31 can be sealed with countersunk bolts to prevent dangerous materials or impurities from entering.

[0073] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A flow channel type explosion suppression and isolation protective barrier based on angular profiles, characterized in that: The system includes an embedded concrete base (10) and a protective grille (20). The concrete base (10) has an installation groove (11) and a base plate (12) at the bottom of the installation groove (11). The protective grille (20) includes a base (21) and a top plate (22) arranged at intervals. The base (21) is detachably mounted on the base plate (12). An I-beam (23) is provided at each end of the base (21) and the top plate (22). The length direction of the I-beam (23) is perpendicular to the surface of the substrate (12) and the two side flanges of the two I-beams (23) are parallel. Two rows of angled profiles (24) are arranged at intervals along the length direction of the substrate (12) between the base (21) and the top seat (22). The openings of the two rows of angled profiles (24) are opposite and staggered. The distance between two adjacent angled profiles (24) in the same row is less than the width of the hypotenuse of the angled profile (24).

2. The flow channel type explosion suppression and isolation protective barrier based on angular profiles according to claim 1, characterized in that: The protective grille (20) includes a mother grille assembly (25) and a daughter grille assembly (26). The mother grille assembly (25) includes a first support plate (251) and a first overlapping plate (252) arranged parallel to each other on the plate surface. The width of the first overlapping plate (252) is less than or equal to half the width of the first support plate (251) and is arranged on one side of the first support plate (251). An I-beam (253) is provided at each end of the first support plate (251) and the first overlapping plate (252). The length direction of the I-beam (253) is perpendicular to the plate surface of the base plate (12), and the two side flanges of the two I-beams (253) are parallel to each other. A row of first angle steels (254) arranged at intervals along the length direction of the base plate (12) is provided in the middle between the first support plate (251) and the first overlapping plate (252). The first angle steel (254) has an opening facing the inside of the first overlapping plate (252); the sub-grid assembly (26) includes a second support plate (261) and a second overlapping plate (262) arranged parallel to each other on the plate surface. The width of the second overlapping plate (262) is less than or equal to half of the second support plate (261) and is arranged on one side of the second support plate (261). A row of second angle steels (263) is arranged between the second support plate (261) and the second overlapping plate (262) and is opposite to and staggered from the opening of the first angle steel (254). The sub-grid assembly (26) is inserted into the mother grid assembly (25) to form a protective grid (20). The first support plate (251) and the second overlapping plate (262) are fitted together to form a base (21). The first overlapping plate (252) and the second support plate (261) are fitted together to form a top seat (22).

3. The flow channel type explosion suppression and isolation protective barrier based on angular profiles according to claim 2, characterized in that: The I-beam (253) has a first notch (2531) at the end near the first lap plate (252) to avoid the first lap plate (252), and the I-beam (253) has a second notch (2532) at the end near the first support plate (251) to avoid the second lap plate (262).

4. A flow channel type explosion suppression and isolation protective barrier based on angular profiles according to claim 2, characterized in that: The first support plate (251) and the first overlapping plate (252) are respectively provided with a row of first through holes (255) and a second through hole (256) corresponding to the first angle steel (254). The first support plate (251) is provided with a row of third through holes (257) that are centrally symmetrical with the first through hole (255) on the side away from the first through hole (255). The base plate (12) is provided with two rows of first screws (13) corresponding to the first through hole (255) and the third through hole (257). The second support plate (261) is provided with a row of fourth through holes (264) corresponding to the second through hole (256). The second overlapping plate (262) is provided with a row of fifth through holes (265) corresponding to the third through hole (257).

5. A flow channel type explosion suppression and isolation protective barrier based on angular profiles according to claim 4, characterized in that: The first support plate (251) has two sixth through holes (258) spaced apart at both ends, and the second overlapping plate (262) has a seventh through hole (266) corresponding to the sixth through hole (258). The base plate (12) is provided with a second screw (14) corresponding to the sixth through hole (258). The first overlapping plate (252) has an eighth through hole (259) at both ends, and the second support plate (261) has a ninth through hole (267) corresponding to the eighth through hole (259) at both ends.

6. A flow channel type explosion suppression and isolation protective barrier based on angular profiles according to claim 1, characterized in that: It also includes a cover plate (30) for covering the mounting groove (11), the size of the cover plate (30) being the same as the size of the groove cavity of the mounting groove (11), and two lifting holes (31) being provided at each end of the cover plate (30).

7. A flow channel type explosion suppression and isolation protective barrier based on angular profiles according to claim 6, characterized in that: The cover plate (30) is a box-shaped structure with an open bottom. Several reinforcing ribs (32) are arranged in a crisscross pattern inside the box-shaped cavity. The upper surface of the cover plate (30) is flush with the upper surface of the mounting groove (11) and the ground surface.

8. A flow channel type explosion suppression and isolation protective barrier based on angular profiles according to claim 1, characterized in that: The concrete base (10) includes a concrete base plate (15), the concrete base plate (15) is provided with an installation base (16), the installation groove (11) is opened in the installation base (16), and the bottom of the base plate (12) is welded with anchor bars and embedded in the installation base (16).

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