Reinforcing and anti-explosion impact structure of square steel frame for confining pressure loading and manufacturing method

Abstract

The invention provides a reinforcing and anti-explosion impact structure of a square steel frame for confining pressure loading and a manufacturing method, and belongs to the technical field of geotechnical engineering experimental equipment.The reinforcing and anti-explosion impact structure comprises a steel frame body, anti-impact force transmission supports are arranged on the four inner side walls of the steel frame body, and movable steel plates are arranged at the other ends of the anti-impact force transmission supports; a jack is arranged on the inner side of the movable steel plate, a force transmission steel plate is arranged at the other end of the jack and arranged on the periphery of the sample, and a blast hole is formed in the center of the sample. According to the structure, the rigid toe boards are additionally arranged at the top and the bottom of the square steel frame, and the rib plates which are arranged in a crossed mode are arranged on the outer sides of the periphery, so that the frame structure is not prone to deformation and instability when pressed. Meanwhile, an anti-impact force transmission support with lead core rubber in the middle and a main body formed by compositing tungsten copper alloy and foamed aluminum materials is designed and used for transmitting confining pressure acting force and absorbing explosion impact, so that the structure provides stable support and protects the stability of the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering experimental equipment, and is particularly suitable for confining pressure loading experiments of deep rock masses under the coupling effect of blasting load and high ground stress, and specifically relates to a reinforced and explosion-proof impact structure of a square steel frame for confining pressure loading and a manufacturing method thereof. Background Art

[0002] With the advancement of deep mineral resource development and underground engineering construction, the study of rock blasting effects under high geostress environments has become a key topic in the field of geotechnical engineering. High geostress environments are mostly located deep underground (such as kilometer-level mines), and on-site field research requires complex equipment and is extremely costly. Field blasting or loading experiments may cause uncontrollable rock bursts, landslides and other disasters, threatening personnel safety. In addition, geological conditions are complex and changeable, and experimental results are easily interfered with, making it difficult to ensure repeatability. The confining pressure simulation loading system can circumvent the limitations of field experiments, and can efficiently and safely reveal the laws of rock behavior, providing a key theoretical basis for deep resource development. Therefore, the confining pressure loading experiment is an important means to simulate the high geostress effects on deep rock masses.

[0003] At present, existing devices such as anchor pull-out test device (CN119023433A) realize multi-directional confining pressure loading through a vertical frame, but the device is large in size and weight and is not suitable for explosion tests; similarly, the rock three-dimensional loading confining pressure holding device (CN39708093A) is difficult to truly reflect the stress state of deep rock mass due to the unstable contact between the baffle and the sample. Patents CN116929911A, CN113790969A, CN115200999A and CN217654868U all construct a confining pressure loading simulation system by setting up a square frame structure and a jack, but during the high confining pressure loading process, the square frame used for support of the main body will produce a large deformation, and at the same time, it is easy to be damaged by the explosion impact during the explosion test. Therefore, it is urgent to develop a reinforcement and explosion-proof impact optimization method for the square steel frame used for confining pressure loading experiments, which has important theoretical significance and practical value for the study of explosion tests under high ground stress in deep rock mass. Summary of the invention

[0004] In view of the above problems, the present invention provides a reinforcement and explosion-proof impact structure and manufacturing method of a square steel frame for confining pressure loading. This structure ensures that the frame structure is not easily deformed and unstable when under pressure by adding rigid toe plates at the top and bottom of the square steel frame and using cross-arranged ribs on the outer sides. At the same time, the design has a lead-core rubber in the middle, and the main body is composed of a tungsten-copper alloy and foam aluminum material composite anti-impact force transmission support, which is used to transmit the confining pressure force and absorb the explosion impact, so that the structure provides stable support and protects the stability of the structure.

[0005] In order to achieve the above technical features, the object of the present invention is achieved as follows: A reinforcement and explosion-proof impact structure for a square steel frame used for confining pressure loading, including a steel frame main body, on the four inner sidewalls of the steel frame main body, impact-resistant force transmission supports are provided, at the other end of the impact-resistant force transmission supports, movable steel plates are provided, inside the movable steel plates, jacks are provided, at the other end of the jacks, force transmission steel plates are provided, the force transmission steel plates are arranged on the periphery of the specimen, and a blast hole is provided at the central part of the specimen.

[0006] Preferably, the steel frame main body is welded into a square steel frame by multiple high-strength steel plates, square box-shaped toe plates are welded on the upper and lower parts respectively, and vertical ribs and horizontal ribs are arranged in a cross-shaped pattern between the upper and lower square box-shaped toe plates and the outer sides of the high-strength steel plates.

[0007] Preferably, both the inner and outer sides of the joints of the high-strength steel plates are precisely welded; The square box-shaped toe plates are formed into a square shape by laser cutting a whole steel plate, and both the inner and outer sides of the joints between the square box-shaped toe plates and the high-strength steel plates are continuously and precisely welded. After the square box-shaped toe plates are welded to the high-strength steel plates, a closed hoop effect is formed to restrict the lateral deformation of the frame.

[0008] Preferably, the thickness of the vertical ribs and the horizontal ribs is greater than the thickness of the high-strength steel plates; The vertical ribs are welded to the square box-shaped toe plates and the high-strength steel plates, and the horizontal ribs are welded to the high-strength steel plates and the vertical ribs.

[0009] Preferably, the impact-resistant force transmission support is assembled by nesting a top cap structure, a buffer block and a support seat. The size of the buffer block corresponds to the frustum-shaped cavities of the top cap structure and the support seat and just fits in; the top cap structure is in contact and cooperation with the inner wall of the steel frame main body, and the support seat is in contact and cooperation with the outer wall of the movable steel plate.

[0010] Preferably, the specific structures of the top cap structure and the support seat are composed of two layers of tungsten copper alloy wrapping a middle layer of aluminum foam material, and energy step absorption is achieved through the porosity gradient; The buffer block is made of lead core rubber material.

[0011] Preferably, the density of the aluminum foam material can continuously vary within the range of 0.8→1.8 g / cm³; The lead core diameter of the lead core rubber material accounts for 30%, the damping ratio ≥15%, and it can isolate more than 90% of the high-frequency vibration energy.

[0012] Preferably, when the top cap structure and the support seat are nested with each other, the middle buffer block will lift the top cap structure, so that there is a certain gap between the top cap structure and the support seat.

[0013] Preferably, the movable steel plate is composed of four thick steel plates of the same size, the surface layer is a tungsten-copper alloy, the bottom layer is a composite of foamed aluminum material, and each thick steel plate can be disassembled and moved, and the local impact force is dispersed into a surface load through a porous structure; The force transmission steel plate is also composed of four steel plates of the same size, and the length and width of each steel plate are the same as the length and width of the test side; The contact surface between the force transmission steel plate and the specimen is processed into a slightly convex surface and coated with a vaseline lubrication layer.

[0014] Another aspect of the present invention provides a method for reinforcing a square steel frame for confining pressure loading and manufacturing an explosion-proof impact structure, comprising the following steps: Step 1, production of square steel frame: select four high-strength steel plates of the same size, with a yield strength of ≥550MPa, and use a laser cutting machine to cut them into preset sizes to ensure that the cuts are smooth and burr-free; weld the four high-strength steel plates of the same size into a square shape, and use continuous and uninterrupted welding on both sides during welding. Perform ultrasonic flaw detection immediately after welding to ensure that the welds are free of cracks and pore defects; Step 2: Use laser cutting equipment to cut a whole piece of high-strength steel plate into a square frame-shaped toe plate with a U-shaped hollow in the middle. The size of the U-shaped hollow of the square frame-shaped toe plate is consistent with the size of the square steel frame. After the cutting is completed, the upper and lower square frame-shaped toe plates are respectively welded to the upper and lower surfaces of the square steel frame. The welding method is continuous seamless welding. Step 3: Use transverse ribs and vertical ribs to cross-weld the outer side of the square steel frame and the upper and lower frame-type toe plates, and small square transverse ribs are welded correspondingly at the corners of the square steel frame; Step 4, make an anti-impact force transmission support, use tungsten steel alloy material to cast the support seat, then place a lead core rubber buffer block inside the support seat, and then weld the flat plate structure to the top cap; Step 5, place the rock sample in a square steel frame, apply vaseline around the rock sample, and then place the force transmission steel plate around the rock sample and fit it; Step 6, place the jack in the square steel frame, and place the movable steel plate and the anti-impact force transmission support at the bottom of the jack in sequence, the bottom of the anti-impact force transmission support is fitted with the square steel frame, and then use a hydraulic press to pressurize the jack so that it pressurizes the rock sample. At this time, the top of the jack will support the force transmission steel plate, and the bottom end will form a support with the square steel frame through the movable steel plate and the anti-impact force transmission support; Step 7. After completing the above steps, place detonators in the blasthole and connect the detonator. After the personnel have evacuated to a safe area, detonate the detonators. At this time, the impact of the explosion acts on the square steel frame through the rock, force transmission steel plate, jack, movable steel plate and anti-impact force transmission support.

[0015] The present invention has the following beneficial effects: 1. The present invention improves the anti-deformation ability of the steel frame by adding support rib plates around the square steel frame, without affecting the original frame size and the overall frame structure. By setting a thick steel plate between the jack and the steel frame to provide force conduction and designing an anti-impact force transmission support, the concentrated force is effectively dispersed, enabling the entire structure to be uniformly stressed. At the same time, the impact force is effectively absorbed, preventing structural deformation and damage. And most of the components are detachable and assembled, facilitating movement and transportation, and convenient for carrying out tests.

[0016] 2. The present invention effectively resists the force-induced deformation of the square steel frame through the cross arrangement of rib plates. At the same time, the integrated upper and lower toe plates have a tightening effect on the steel frame, reducing the deformation amount of the square steel frame. The combined action of the rib plates and the toe plates ensures that the frame structure can stably provide support, ensuring the stability of the confining pressure application and reducing test errors.

[0017] 3. The present invention forms a multi-stage energy dissipation structure through the movable steel plate made of tungsten steel alloy and foam aluminum composite material and the anti-impact force transmission support with a lead core rubber buffer block, increasing the reflection and dissipation of shock waves, while isolating and participating in vibrations, reducing the residual deformation of the frame after impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the overall optimized structure and test implementation of the present invention.

[0020] Figure 2 It is a top view of the overall optimized structure and test implementation of the present invention.

[0021] Figure 3 It is a schematic diagram of the "mouth"-shaped frame structure of the present invention.

[0022] Figure 4 It is a cross-sectional view of the anti-impact force transmission support of the present invention Figure 5 It is a three-dimensional structure diagram of the anti-impact force transmission support of the present invention.

[0023] In the figure: the main body of the steel frame 100, the movable steel plate 200, the anti-impact force transmission support 300, the jack 400, the force transmission steel plate 500, the specimen 600, the blast hole 700; The square frame toe plate 101, the high-strength steel plate 102, the vertical rib plate 103, the horizontal rib plate 104; The top cap structure 301, the buffer block 302, the support base 303. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The embodiments of the present invention will be further described below in conjunction with the drawings.

[0025] Example 1: Referring to Figures 1 - 5 , a reinforcement and explosion-proof impact structure for a square steel frame used for confining pressure loading, including a steel frame main body 100. Anti-impact force transmission supports 300 are provided on the four inner sidewalls of the steel frame main body 100. The other end of the anti-impact force transmission support 300 is provided with a movable steel plate 200. A jack 400 is arranged inside the movable steel plate 200. The other end of the jack 400 is provided with a force transmission steel plate 500. The force transmission steel plate 500 is arranged around a specimen 600, and a blast hole 700 is arranged at the central part of the specimen 600. During the use process, the top of the hydraulic jack 400 provides confining pressure to the specimen 600 through the force transmission steel plate 500. The bottom of the hydraulic jack 400 abuts against the movable steel plate 200, and the support is realized by the square steel frame 100 and the anti-impact force transmission support 300. During the explosion test, the anti-impact force transmission support 300 dissipates the energy of the explosion shock wave to ensure the safety and stability of the structure.

[0026] Furthermore, the steel frame main body 100 is welded into a square steel frame by multiple high-strength steel plates 102. Square box-shaped toe plates 101 are welded to the upper and lower parts respectively. Vertical ribs 103 and horizontal ribs 104 are arranged in a cross-shaped pattern between the outer sides of the upper and lower square box-shaped toe plates 101 and the high-strength steel plates 102. Through the above-mentioned steel frame main body 100, it can form a structure for transmitting confining pressure and absorbing explosion impact, so as to provide stable support and protect the stability of the structure.

[0027] Furthermore, the inner and outer sides of the joints of the high-strength steel plates 102 are precisely welded; the square box-shaped toe plates 101 are laser cut from a whole steel plate into a square shape, and the inner and outer sides of the joints between the square box-shaped toe plates 101 and the high-strength steel plates 102 are both continuously and precisely welded. After the square box-shaped toe plates 101 and the high-strength steel plates 102 are welded, a closed hoop effect is formed to restrain the lateral deformation of the frame.

[0028] Furthermore, the thickness of the vertical ribs 103 and the horizontal ribs 104 is greater than the thickness of the high-strength steel plates 102; the vertical ribs 103 are welded to the square box-shaped toe plates 101 and the high-strength steel plates 102, and the horizontal ribs 104 are welded to the high-strength steel plates 102 and the vertical ribs 103. By adding support ribs around the square steel frame, the anti-deformation ability of the steel frame is improved, and at the same time, the original frame size and the overall frame structure are not affected.

[0029] Moreover, the cross-shaped arrangement of the ribs effectively resists the force deformation of the square steel frame. At the same time, the integrated upper and lower square box-shaped toe plates 101 have a tightening effect on the steel frame, reducing the deformation amount of the square steel frame. The combined action of the ribs and the toe plates ensures that the frame structure can stably provide support, ensure the stability of the confining pressure application, and reduce test errors.

[0030] Furthermore, the shock-proof force transfer bearing 300 is assembled by nesting a top cap structure 301, a buffer block 302, and a support seat 303. The size of the buffer block 302 corresponds to the frustum-shaped cavities of the top cap structure 301 and the support seat 303 and is just embedded therein. The top cap structure 301 is in contact and cooperation with the inner wall of the steel frame body 100, and the support seat 303 is in contact and cooperation with the outer wall of the movable steel plate 200.

[0031] Furthermore, the specific structures of the top cap structure 301 and the support seat 303 are composed of two layers of tungsten copper alloy wrapping a middle layer of aluminum foam material, achieving stepped energy absorption through porosity gradient; the buffer block 302 is made of lead core rubber material. The movable steel plate made of tungsten steel alloy and aluminum foam composite material and the shock-proof force transfer bearing with a lead core rubber buffer block together form a multi-stage energy dissipation structure, increasing the reflection and dissipation of shock waves, while isolating and participating in vibration and reducing the residual deformation of the frame after impact.

[0032] Furthermore, the density of the aluminum foam material can vary continuously in the range of 0.8→1.8 g / cm³; stepped energy absorption is achieved through porosity gradient.

[0033] Furthermore, the lead core diameter of the lead core rubber material accounts for 30%, the damping ratio ≥15%, and it can isolate more than 90% of the high-frequency vibration energy.

[0034] Furthermore, when the top cap structure 301 and the support seat 303 are nested with each other, the middle buffer block 302 will lift the top cap structure 301, making there a certain gap between the top cap structure 301 and the support seat 303. This facilitates the structure to produce small deformations to absorb energy when the structure is subjected to an impact.

[0035] Furthermore, the movable steel plate 200 is composed of four thick steel plates of the same size, with a tungsten copper alloy on the surface layer and an aluminum foam material on the bottom layer, and each thick steel plate can be disassembled and moved. The local impact force is dispersed into a surface load through the porous structure.

[0036] Furthermore, the force transfer steel plate 500 is also composed of four steel plates of the same size, and the length and width of each steel plate are the same as the side length and width of the test. Furthermore, it is used to transfer the impact force during the test.

[0037] Furthermore, the contact surface between the force transfer steel plate 500 and the specimen 600 is processed into a micro-convex curved surface, and the radius of curvature R =500 mm, and a vaseline lubricating layer with a thickness of 0.1 mm is applied to reduce the stress deviation caused by the end effect.

[0038] Example 2: The present invention provides a method for strengthening and optimizing explosion-proof impact of a square steel frame for confining pressure loading experiments, which is characterized by including the following steps: (a) Construct the main body 100 of the square steel frame made of channel steel: A square steel frame is welded by high-strength steel plates 102, and box-shaped toe plates 101 are welded to the upper and lower parts respectively. Vertical ribs 103 and horizontal ribs 104 are arranged in a cross shape between the outer sides of the upper and lower box-shaped toe plates 101 and the high-strength steel plates 102.

[0039] (b) Construct the anti-impact force transfer support 300: A top cap structure 301 and a support base 303 made of a composite material of tungsten copper alloy and aluminum foam, and a buffer block 302 is made of lead core rubber in the middle.

[0040] (c) Place a movable steel plate 200 between the bottom of the jack 400 and the top cap structure 301 of the anti-impact force transfer support 300, which is used to evenly transfer the acting force between the jack 400 and the anti-impact force transfer support 300, and at the same time prevent the structural instability between the jack 400 and the anti-impact force transfer support 300.

[0041] (d) Arrange a force transfer steel plate 500 between the top of the jack 400 and the specimen 600 to facilitate the uniform action of the force of the jack on the specimen.

[0042] Example 3: On the other hand, the present invention provides a manufacturing method for strengthening and explosion-proof impact structure of a square steel frame for confining pressure loading, including the following steps: Step 1, manufacturing of the square steel frame: Select four high-strength steel plates 102 with the same size and a yield strength ≥ 550 MPa, and cut them into a preset size by a laser cutting machine to ensure that the cut is smooth and burr-free; Weld the four high-strength steel plates 102 with the same size into a square shape. During welding, continuous and uninterrupted welding is used on both the inner and outer sides, and ultrasonic flaw detection is immediately carried out after welding to ensure that there are no cracks and pore defects in the weld; As Figure 3 shown in the square steel frame structure.

[0043] Step 2, Use a laser cutting device to cut a whole high-strength steel plate into a box-shaped toe plate 101 with a square-shaped hollow in the middle. The size of the square-shaped hollow of the box-shaped toe plate 101 is the same as the size of the square steel frame. As Figure 3 shown in the middle toe plate structure, and the effective plate width of the toe plate is greater than 10 cm. After cutting, weld the upper and lower box-shaped toe plates 101 to the upper and lower sides of the square steel frame respectively, and the welding method is continuous seamless welding; Step 3, As Figure 3 shown, use horizontal ribs 104 and vertical ribs 103 to perform cross welding between the outer side of the square steel frame and the upper and lower box-shaped toe plates 101. At the corners of the square steel frame, small square horizontal ribs are welded correspondingly; Step 4, such as Figures 4 - 5 As shown, the impact-proof force transmission support 300 is manufactured by casting a support seat 303 with tungsten steel alloy material, and then placing a lead core rubber buffer block 302 inside the support seat 303, and then welding the flat plate structure to the top cap; Step 5, placing the rock sample 600 in a square steel frame, applying vaseline around the rock sample 600, and then placing the force transmission steel plate 500 around the rock sample and fitting them together; Step 6, such as Figure 1 and 2 As shown, the jack 400 is placed in a square steel frame, and the movable steel plate 200 and the anti-impact force transmission support 300 are placed in sequence at the bottom of the jack 400, and the bottom of the anti-impact force transmission support 300 is fitted with the square steel frame. Then, a hydraulic press is used to pressurize the jack 400 so that it pressurizes the rock sample. At this time, the top of the jack will support the force transmission steel plate 500, and the bottom end will form a support with the square steel frame through the movable steel plate 200 and the anti-impact force transmission support 300; Step 7, after the above steps are completed, detonators are arranged in the blasthole 700 and the detonator is connected. After the personnel are evacuated to the safe area, the detonators are detonated. At this time, the impact of the explosion acts on the square steel frame through the rock, the force transmission steel plate 500, the jack 400, the movable steel plate 200 and the anti-impact force transmission support 300.

[0044] Embodiment 4: The multi-level protection principle of the present invention: The first level of reflection uses the high wave impedance characteristics of tungsten copper alloy to reflect 60%-70% of the incident shock wave energy.

[0045] In the second stage of energy absorption, the aluminum foam layer with a density gradient dissipates the remaining shock wave energy in three stages through pore collapse, plastic deformation and interlayer friction: Initial stage: The low-density area (0.8g / cm³) undergoes elastic deformation and absorbs high-frequency energy; Mid-stage: Plastic buckling in the medium-density zone (1.3 g / cm³) to dissipate the main energy; Late stage: High-density areas (1.8g / cm³) are compacted and locked, preventing energy from being transferred back.

[0046] Third-level seismic isolation: The viscoelastic damping characteristics of the lead rubber buffer block convert the residual low-frequency vibration energy into heat energy (temperature rise ≤ 5°C), and reduce the structural acceleration response to less than 0.3 times the gravity acceleration through base isolation.

[0047] The surface material of the movable steel plate can effectively reflect the shock wave, and the inner layer of aluminum foam material can well absorb energy. The lead-rubber buffer block in the shock-proof force-transferring bearing absorbs energy and isolates vibration through micro-deformation. These measures will effectively reduce the impact of the shock on the square steel frame. At the same time, the rib plates and toe plates on the square steel frame convert the local load into axial force through the truss effect, reduce the deformation caused by the bending moment, effectively prevent the frame from deforming, and ensure the structural stability.

[0048] The specific embodiments of the present invention have been described in detail above, but it is only one of the embodiments, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, any equivalent transformation and modification made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A reinforcement and explosion-proof impact structure for a square steel frame used in confining pressure loading, characterized in that, It includes a steel frame main body (100). Impact-resistant force transmission supports (300) are provided on the four inner side walls of the steel frame main body (100). The other end of the impact-resistant force transmission support (300) is provided with a movable steel plate (200). A jack (400) is arranged inside the movable steel plate (200). The other end of the jack (400) is provided with a force transmission steel plate (500). The force transmission steel plate (500) is arranged around a specimen (600), and a blast hole (700) is arranged at the central part of the specimen (600).

2. The reinforcement and explosion-proof impact structure of the square steel frame for confining pressure loading according to claim 1, characterized in that, The steel frame main body (100) is welded into a square steel frame by multiple high-strength steel plates (102). Square toe plates (101) are welded to the upper and lower parts respectively. Vertical rib plates (103) and horizontal rib plates (104) are arranged in a cross-shaped pattern between the upper and lower square toe plates (101) and the outer sides of the high-strength steel plates (102).

3. The reinforcement and explosion-proof impact structure of the square steel frame for confining pressure loading according to claim 2, characterized in that, Both the inner and outer sides of the joints of the high-strength steel plates (102) are precisely welded; The square toe plates (101) are formed into a square shape by laser cutting a whole steel plate. Both the inner and outer sides of the joints between the square toe plates (101) and the high-strength steel plates (102) are continuously and precisely welded. After the square toe plates (101) and the high-strength steel plates (102) are welded, a closed hoop effect is formed to restrain the lateral deformation of the frame.

4. The reinforcement and explosion-proof impact structure of a square steel frame for confining pressure loading according to claim 2, characterized in that The thicknesses of the vertical rib plates (103) and the horizontal rib plates (104) are greater than the thickness of the high-strength steel plates (102); The vertical rib plates (103) are welded to the square toe plates (101) and the high-strength steel plates (102), and the horizontal rib plates (104) are welded to the high-strength steel plates (102) and the vertical rib plates (103).

5. The reinforcement and explosion-proof impact structure of a square steel frame for confining pressure loading according to claim 1, characterized in that, The impact-resistant force transmission support (300) is assembled by nesting a top cap structure (301), a buffer block (302) and a support base (303). The size of the buffer block (302) corresponds to the frustum-shaped cavities of the top cap structure (301) and the support base (303) and just fits in. The top cap structure (301) is in contact and cooperation with the inner wall of the steel frame main body (100), and the support base (303) is in contact and cooperation with the outer wall of the movable steel plate (200).

6. The reinforcement and explosion-proof impact structure of a square steel frame for confining pressure loading according to claim 5, characterized in that, The specific structures of the top cap structure (301) and the support base (303) are composed of two layers of tungsten copper alloy wrapping a middle layer of aluminum foam material, and energy step absorption is achieved through the porosity gradient; The buffer block (302) is made of lead core rubber material.

7. The reinforcement and explosion-proof impact structure of the square steel frame for confining pressure loading according to claim 6, characterized in that, The density of the aluminum foam material can continuously vary within the range of 0.8→1.8 g / cm³; The lead core diameter of the lead core rubber material accounts for 30%, the damping ratio is ≥15%, and it can isolate more than 90% of the high-frequency vibration energy.

8. The reinforcement and explosion-proof impact structure of a square steel frame for confining pressure loading according to claim 6, wherein, When the top cap structure (301) and the support base (303) are nested with each other, the middle buffer block (302) will lift the top cap structure (301), so that there is a certain gap between the top cap structure (301) and the support base (303).

9. The reinforcement and explosion-proof impact structure of a square steel frame for confining pressure loading according to claim 6, characterized in that, The movable steel plate (200) is composed of four thick steel plates of the same size, with a tungsten copper alloy surface layer and an aluminum foam material bottom layer. Each thick steel plate can be disassembled and moved, and the local impact force is dispersed into a surface load through the porous structure; The force transmission steel plate (500) is also composed of four steel plates of the same size, and the length and width of each steel plate are the same as the length and width of the side of the test; The contact surface between the force transmission steel plate (500) and the test specimen (600) is processed into a slightly convex surface and coated with a vaseline lubrication layer.

10. The manufacturing method of a reinforcement and explosion-proof impact structure for a square steel frame used for confining pressure loading according to any one of claims 7-9, characterized in that, The following steps are involved: Step 1, manufacturing a square steel frame: four high-strength steel plates (102) of the same size are selected, and the yield strength is ≥550 MPa. The plates are cut into a preset size using a laser cutting machine to ensure that the cut is smooth and free of burrs; the four high-strength steel plates (102) of the same size are welded into a square shape. During welding, continuous and uninterrupted welding is performed on both the inner and outer sides. Ultrasonic flaw detection is performed immediately after welding to ensure that the weld is free of cracks and pore defects; Step 2, using a laser cutting device to cut a whole piece of high-strength steel plate into a square frame-shaped toe plate (101) with a square-shaped hollow in the middle, wherein the size of the square-shaped hollow in the square frame-shaped toe plate (101) is consistent with the size of the square steel frame. After the cutting is completed, the upper and lower square frame-shaped toe plates (101) are respectively welded to the upper and lower surfaces of the square steel frame, and the welding method is continuous seamless welding; Step 3, cross-welding the transverse ribs (104) and the vertical ribs (103) between the outer side of the square steel frame and the upper and lower frame-type toe plates (101), and welding small square transverse ribs at the corners of the square steel frame; Step 4, manufacturing an anti-impact force transmission support (300), using tungsten steel alloy material to cast a support seat (303), then placing a lead core rubber buffer block (302) inside the support seat (303), and then welding the flat plate structure to the top cap; Step 5, placing the rock sample (600) in a square steel frame, applying vaseline around the rock sample (600), and then placing the force transmission steel plate (500) around the rock sample and fitting it; Step 6, placing the jack (400) in the square steel frame, and placing the movable steel plate (200) and the anti-impact force transmission support (300) in sequence at the bottom of the jack (400), the bottom of the anti-impact force transmission support (300) is fitted with the square steel frame, and then the jack (400) is pressurized by a hydraulic press to pressurize the rock sample. At this time, the top of the jack will support the force transmission steel plate (500), and the bottom end will form a support with the square steel frame through the movable steel plate (200) and the anti-impact force transmission support (300); Step 7, after the above steps are completed, a detonator is arranged in the blasthole (700) and a detonator is connected. After the personnel have evacuated to a safe area, the detonator is detonated. At this time, the impact of the explosion acts on the square steel frame through the rock, the force transmission steel plate (500), the jack (400), the movable steel plate (200) and the anti-impact force transmission support (300).

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