A steel structure test section for a nuclear blast shock wave simulation test system

Abstract

The application provides a steel structure test section for a nuclear explosion shock wave simulation test system, which comprises, from left to right, a charging test section, a first test section, a first reducing section, a second test section, a second reducing section and a third test section; the first test section, the second test section and the third test section are all straight wall circular arch tubular structures; the right end of the charging test section is connected with the first test section through the first reducing section; the right end of the first test section is connected with the second test section through the second reducing section; and the right end of the second test section is connected with the third reducing section. The application can be combined into different structure states according to test requirements, meets more test requirements, improves energy utilization rate, and the test environment state is consistent with the actual situation of an underground tunnel; the combination of the test section can avoid repeated construction of the whole system, and reduce the test construction cost; the test section can build a test section explosion shock wave stitching technology, and energy density is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of explosion shock wave test technology, in particular to the structure of a test section of a nuclear explosion shock wave simulation test system, and more particularly to a steel structure test section for a nuclear explosion shock wave simulation test system. BACKGROUND

[0002] An explosion wave simulation device is a test device for generating an explosion shock wave by using chemical explosion, and is a special test equipment for studying dynamic responses of ground and underground engineering structures under explosion load. As a loading means for explosion shock wave test, the explosion wave simulation device has the advantages of single mechanical parameter, good repeatability, simple operation, short time course, etc.

[0003] The existing nuclear explosion shock wave simulation test system is composed of a driving section explosion chamber and a test section. The driving section is used for simulating nuclear explosion, and the test section part serves as a test area function, in which various equipment explosion resistance tests are carried out. At present, the test section of the nuclear explosion shock wave simulation test system is mostly in the form of a circular pipe structure, which is composed of multiple sections with different pipe diameters. After the test section is assembled as a whole, in order to ensure the structural strength during the test, the test section as a whole is fixed by using concrete and is no longer split. However, in actual use, it is found that the test section of the existing nuclear explosion shock wave simulation test system has the following problems:

[0004] (1) The pipe cross section of the existing test section does not match the cross section of the tunnel of the underground engineering, and cannot truly reflect the actual state of the equipment in the tunnel.

[0005] (2) The existing test section cannot be split and combined for different functions again. The test area is fixed, and the test function is also fixed. For example, the explosion resistance test of the equipment can only be carried out in a specific section, and there is almost no other way to change the incident shock wave except for changing the incident overpressure. It is difficult to meet the diversification of test requirements. At the same time, the fixed system cannot meet more test requirements. With the expansion of the test range, a new system must be built. Each nuclear explosion shock wave simulation test system consumes a huge amount of capital, and cost is a factor that must be considered.

[0006] (3) The existing test section cannot actively intervene in the incident shock wave. The incident shock wave from the driving section explosion chamber often has a large difference from the preset value. Under the constraint of the pipe, the propagation direction of the shock wave is often different from the preset direction, causing a large difference between the test and the actual situation. In addition, the energy density decay state of the existing test section cannot be changed after the incident shock wave, and there is no measure to actively improve the energy density.

[0007] (4) The existing test section cannot be split and combined for different functions again. Even with a large initial energy, only limited test content can be carried out, and the energy utilization rate is low. SUMMARY

[0008] In order to solve the problems in the background art, the steel structure test section for the nuclear explosion shock wave simulation test system is provided, which adopts the sectional design, can be combined into different structure states according to the test requirements, meets more test requirements, improves the energy utilization rate, and the test environment state is consistent with the actual situation of the underground tunnel. The combination of the test section can avoid repeated construction of the whole system, reduce the test construction cost, and the test section can build the explosion shock wave stitching technology of the test section, and the energy density is improved.

[0009] In order to achieve the above-mentioned purpose, the following technical scheme is adopted in the present application:

[0010] A steel structure test section for a nuclear explosion shock wave simulation test system, comprising a charging test section, a first test section, a first variable diameter section, a second test section, a second variable diameter section and a third test section arranged in order from left to right, the charging test section is a circular pipe structure, fixed on the ground by a reinforced concrete member, the reinforced concrete member is wrapped around the middle position of the charging test section outside, and the charging test section is provided with a charging station inside;

[0011] The first test section, the second test section and the third test section are all straight wall circular arch pipe structures, which are composed of a bottom wall, a vertical side wall and an arc-shaped dome which are fixed as one body, the bottom wall is horizontally arranged, the arc-shaped dome is arranged above the bottom wall, and the vertical side wall is connected to the two sides of the arc-shaped dome respectively, the inner diameter of the arc-shaped dome of the first test section is smaller than that of the second test section, and the inner diameter of the arc-shaped dome of the second test section is smaller than that of the third test section;

[0012] The left end of the charging test section is connected to the driving section explosion chamber of the nuclear explosion shock wave simulation test system through an external diaphragm mounting section, the right end of the charging test section is connected to the first test section through the first variable diameter section, the right end of the first test section is connected to the second test section through the second variable diameter section, the right end of the second test section is connected to the third variable diameter section, and the right end of the third variable diameter section is provided with a counterforce frame between the left end of the third test section, the right end of the third test section is provided with a counterforce wall and a counterforce gap adjusting support, and the counterforce gap adjusting support is located between the third test section and the counterforce wall.

[0013] The first test section is fixedly covered with a first rib plate outside the bottom wall, both side walls of the first test section are fixedly covered with a second rib plate outside, the first rib plate and the two second rib plates are fixedly connected as a whole to form a U-shaped frame structure with an opening upward; the second test section is fixedly covered with a third rib plate outside the bottom wall, both side walls of the second test section are fixedly covered with a fourth rib plate outside, the third rib plate and the two fourth rib plates are fixedly connected as a whole to form a U-shaped frame structure with an opening upward; the third test section is fixedly covered with a fifth rib plate outside the bottom wall, both side walls of the third test section are fixedly covered with a sixth rib plate outside, the fifth rib plate and the two sixth rib plates are fixedly connected as a whole to form a U-shaped frame structure with an opening upward.

[0014] The first test section is fixedly connected with a first flange and a second flange at both ends respectively, the first rib plate and the second rib plate are fixedly connected with the first flange and the second flange at both ends respectively; the second test section is fixedly connected with a third flange and a fourth flange at both ends respectively, the third rib plate and the fourth rib plate are fixedly connected with the third flange and the fourth flange at both ends respectively; the third test section is fixedly connected with a fifth flange and a sixth flange at both ends respectively, the fifth rib plate and the sixth rib plate are fixedly connected with the fifth flange and the sixth flange at both ends respectively.

[0015] The first variable-diameter section, the second variable-diameter section and the third variable-diameter section are all straight-wall circular-arch variable-diameter pipe structures, the straight-wall circular-arch variable-diameter pipe structure is composed of a bottom plate, a vertical side plate and an arc-shaped vaulted plate, the left end inner diameter of the arc-shaped vaulted plate is smaller than the right end inner diameter, the bottom plate is horizontally arranged, the arc-shaped vaulted plate is arranged above the bottom plate, and the two sides of the bottom plate are connected with the two sides of the arc-shaped vaulted plate through the vertical side plate respectively;

[0016] The first variable-diameter section is fixedly covered with a seventh rib plate outside the bottom wall, both side walls of the first variable-diameter section are fixedly covered with an eighth rib plate outside, the seventh rib plate and the two eighth rib plates are fixedly connected as a whole to form a U-shaped frame structure with an opening upward; the second variable-diameter section is fixedly covered with a ninth rib plate outside the bottom wall, both side walls of the second variable-diameter section are fixedly covered with a tenth rib plate outside, the ninth rib plate and the two tenth rib plates are fixedly connected as a whole to form a U-shaped frame structure with an opening upward; the third variable-diameter section is fixedly covered with an eleventh rib plate outside the bottom wall, both side walls of the third variable-diameter section are fixedly covered with a twelfth rib plate outside, the eleventh rib plate and the two twelfth rib plates are fixedly connected as a whole to form a U-shaped frame structure with an opening upward.

[0017] The seventh flange and the eighth flange are fixedly connected to the two ends of the seventh rib plate and the eighth rib plate respectively; the ninth flange and the tenth flange are fixedly connected to the two ends of the ninth rib plate and the tenth rib plate respectively; the eleventh flange and the twelfth flange are fixedly connected to the two ends of the eleventh rib plate and the second rib plate respectively.

[0018] The counterforce frame comprises a fixed support frame, a support frame, a vertical beam and a horizontal beam, wherein the fixed support frame is fixedly connected to the ground, and the support frame is fixedly connected to the upper surface of the fixed support frame; the support frame as a whole is a vertical plate frame structure, the right side surface of which is fixedly connected to the left end of the third test section, and the left side surface is provided with a panel, the middle part of the panel is provided with a door opening for installing test equipment, and one vertical beam is arranged on each side of the door opening, and the opposite side of the two vertical beams is respectively provided with a side plate; the panel above the door opening is fixedly connected with a horizontal beam, the two ends of the horizontal beam are respectively connected with the upper ends of the two vertical beams, and a flat plate is arranged on the lower surface of the horizontal beam; a bottom plate is arranged on the fixed support frame below the door opening, and the side plate and the flat plate form a closed cavity which is only open on the left side together with the bottom plate and the panel.

[0019] The number of the counterforce gap adjustment supports is two, and the two counterforce gap adjustment supports are respectively arranged on the two sides of the tail end of the third test section; the counterforce gap adjustment support comprises a vertical frame and a top rod, the vertical frame as a whole is a vertical frame structure which is perpendicular to the counterforce wall, one end of the vertical frame abuts against the counterforce wall, and the other end of the vertical frame is provided with a plurality of positioning installation holes arranged vertically, and the top rod is threadedly connected with the positioning installation holes, and the other end of the top rod abuts against the third test section.

[0020] The lower parts of the first variable-diameter section, the first test section, the second variable-diameter section, the second test section, the third variable-diameter section and the third test section are respectively provided with steel frames and are fixed to the ground through the corresponding steel frames.

[0021] The present application has the advantages that: the present application adopts the design of sub-sections, can be combined into different structure states according to test requirements, meets more test requirements, improves energy utilization rate, and the test environment state conforms to the actual situation of an underground tunnel; the combination of test sections can avoid repeated construction of the whole system, and reduce test construction cost; the test section can build the test section explosion shock wave stitching technology through the charging test section, and energy density is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0023] Figure 2 It is a schematic diagram of the charging test section in the present application.

[0024] Figure 3 This is a three-dimensional schematic diagram of the first diameter-changing section.

[0025] Figure 4 This is a three-dimensional schematic diagram of the first test section.

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the reaction frame.

[0027] Figure 6 This is a three-dimensional structural diagram of the reaction force gap adjustment bracket.

[0028] In the diagram: 4. Reaction frame, 5. Reaction wall, 6. Reaction gap adjustment bracket, 20. Explosive loading test section, 21. First test section, 22. Second test section, 23. Third test section, 25. Reinforced concrete component, 27. Explosive loading station, 201. First diameter changing section, 202. Second diameter changing section, 203. Third diameter changing section, 41. Fixed support frame, 42. Bracket, 43. Vertical beam, 44. Horizontal beam, 411. Base plate, 421. Panel, 425. Doorway, 431. Side plate, 441. Flat plate, 61. Vertical frame, 62. Top rod. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1-4 As shown, a steel structure test section for a nuclear explosion shock wave simulation test system includes, from left to right, a charge test section 20, a first test section 21, a first diameter-changing section 201, a second test section 22, a second diameter-changing section 202, and a third test section 23. The charge test section 20 is a cylindrical structure, fixed to the ground by reinforced concrete components 25, which cover the middle of the outer surface of the charge test section 20. A charge station 27 is provided inside the charge test section.

[0031] The first test section 21, the second test section 22, and the third test section 23 are all straight-walled circular arch tubular structures. The straight-walled circular arch tubular structure is composed of a bottom wall, vertical side walls, and an arc-shaped arch top that are fixed together. The bottom wall is set horizontally, and the arc-shaped arch top is set above the bottom wall. The two sides of the bottom wall are connected to the two sides of the arc-shaped arch top through the vertical side walls. The inner diameter of the arc-shaped arch top of the first test section 21 is smaller than that of the second test section 22, and the inner diameter of the arc-shaped arch top of the second test section 22 is smaller than that of the third test section 23.

[0032] The left end of the charge test section 20 is connected to the drive section detonation chamber of the nuclear explosion shock wave simulation test system via an external diaphragm installation section. The right end of the charge test section 20 is connected to the first test section 21 via a first variable diameter section 201. The right end of the first test section 21 is connected to the second test section 22 via a second variable diameter section 202. The right end of the second test section 22 is connected to the third variable diameter section 203. A reaction frame 4 is provided between the right end of the third variable diameter section 203 and the left end of the third test section 23. A reaction wall 5 and a reaction gap adjustment bracket 6 are provided at the right end of the third test section 23. The reaction gap adjustment bracket 6 is located between the third test section 23 and the reaction wall 5.

[0033] The first test section 21 has a first stiffening plate fixedly covering its bottom wall, and second stiffening plates fixedly covering its two side walls. The first stiffening plate and the two second stiffening plates are integrally connected to form an upward-opening U-shaped frame structure. The second test section 22 has a third stiffening plate fixedly covering its bottom wall, and fourth stiffening plates fixedly covering its two side walls. The third stiffening plate and the two fourth stiffening plates are integrally connected to form an upward-opening U-shaped frame structure. The third test section 23 has a fifth stiffening plate fixedly covering its bottom wall, and sixth stiffening plates fixedly covering its two side walls. The fifth stiffening plate and the two sixth stiffening plates are integrally connected to form an upward-opening U-shaped frame structure.

[0034] The first test section 21 is fixedly connected to a first flange and a second flange at both ends, and the first stiffener and the second stiffener are fixedly connected to the first flange and the second flange at both ends, respectively; the second test section 22 is fixedly connected to a third flange and a fourth flange at both ends, and the third stiffener and the fourth stiffener are fixedly connected to the third flange and the fourth flange at both ends, respectively; the third test section 23 is fixedly connected to a fifth flange and a sixth flange at both ends, and the fifth stiffener and the sixth stiffener are fixedly connected to the fifth flange and the sixth flange at both ends, respectively.

[0035] The first diameter-changing section 201, the second diameter-changing section 202, and the third diameter-changing section 203 are all straight-walled arched diameter-changing pipe structures. The straight-walled arched diameter-changing pipe structure is composed of a base plate, vertical side plates, and an arc-shaped arched top plate that are fixed together. The inner diameter of the left end of the arc-shaped arched top plate is smaller than the inner diameter of the right end. The base plate is set horizontally, and the arc-shaped arched top plate is set above the base plate. The two sides of the base plate are connected to the two sides of the arc-shaped arched top plate through vertical side plates.

[0036] The first diameter-changing section 201 has a seventh rib fixedly covered on its bottom wall, and both sides of the first diameter-changing section 201 are fixedly covered with eighth ribs. The seventh rib and the two eighth ribs are fixedly connected to form a U-shaped frame structure with an upward opening. The second diameter-changing section 202 has a ninth rib fixedly covered on its bottom wall, and both sides of the second diameter-changing section 202 are fixedly covered with tenth ribs. The ninth rib and the two tenth ribs are fixedly connected to form a U-shaped frame structure with an upward opening. The third diameter-changing section 203 has an eleventh rib fixedly covered on its bottom wall, and both sides of the third diameter-changing section 203 are fixedly covered with twelfth ribs. The eleventh rib and the two twelfth ribs are fixedly connected to form a U-shaped frame structure with an upward opening.

[0037] The first diameter-changing section 201 is fixedly connected to the seventh flange and the eighth flange at both ends, and the seventh stiffening plate and the eighth stiffening plate are fixedly connected to the seventh flange and the eighth flange at both ends, respectively; the second diameter-changing section 202 is fixedly connected to the ninth flange and the tenth flange at both ends, and the ninth stiffening plate and the tenth stiffening plate are fixedly connected to the ninth flange and the tenth flange at both ends, respectively; the third diameter-changing section 203 is fixedly connected to the eleventh flange and the twelfth flange at both ends, and the eleventh stiffening plate and the second stiffening plate are fixedly connected to the eleventh flange and the twelfth flange at both ends, respectively.

[0038] The reaction frame 4 includes a fixed support frame 41, a bracket 42, a vertical beam 43, and a horizontal beam 44. The fixed support frame 41 is fixed to the ground, and the bracket 42 is fixed to the upper surface of the fixed support frame 41. The bracket 42 is an overall vertical plate-type frame structure.

[0039] The right side is fixedly connected to the left end of the third test section 23. The left side is provided with a panel 421. The panel 421 has a doorway 425 in the middle for installing test equipment. A vertical beam 43 is provided on each side of the doorway 425. The opposite sides of the two vertical beams 43 are provided with side plates 431. A crossbeam 44 is fixedly connected to the panel 421 above the doorway 425. The two ends of the crossbeam 44 are respectively connected to the upper ends of the two vertical beams 43. A flat plate 441 is provided on the lower surface of the crossbeam 44. A base plate 411 is provided on the fixed support frame 41 below the doorway 425. The side plates 431, flat plates 441, base plates 411, and panel 421 form a closed cavity with an opening only on the left side.

[0040] The reaction force gap adjustment bracket 6 is of two types, and the two reaction force gap adjustment brackets 6 are located on both sides of the tail end of the third test section 23. The reaction force gap adjustment bracket 6 is composed of a vertical frame 61 and a top rod 62. The vertical frame 61 is a vertical frame structure perpendicular to the reaction wall 5. One end of the vertical frame 61 abuts against the reaction wall 5, and the other end is provided with multiple vertically arranged positioning and mounting holes. The top rod 62 is threadedly connected to a positioning and mounting hole, and the other end of the top rod 62 abuts against the third test section 23.

[0041] The lower parts of the first variable diameter section 201, the first test section 21, the second variable diameter section 202, the second test section 22, the third variable diameter section 203, and the third test section 23 are each equipped with a steel frame 26 and are fixed to the ground by the corresponding steel frame 26. This structure is easy to disassemble and reassemble, and can be transformed into test sections of different diameters.

[0042] The reaction wall 5 is a reinforced concrete wall, and a supporting bracket is provided on its right side. The supporting bracket is a reinforced concrete wall perpendicular to the reaction wall 5.

[0043] In this invention, the test section 20 is an auxiliary area. By detonating the explosive in the test section 20, the incoming shock wave can be actively intervened, further improving the simulated morphology of the explosion shock wave in the test section. At the same time, the test section explosion shock wave stitching technology is established. The explosive detonation in the test section can effectively increase the super-shock wave pressure of the shock wave in the test section, actively increase the energy density, and meet the needs of high-level protective equipment testing.

[0044] The parts of this invention not described in detail are prior art.

Claims

1. A steel structure test section for a nuclear explosion shock wave simulation test system, comprising, from left to right, a charge test section (20), a first test section (21), a first variable diameter section (201), a second test section (22), a second variable diameter section (202), and a third test section (23), characterized in that: The test section (20) is a cylindrical structure, which is fixed to the ground by a reinforced concrete component (25). The reinforced concrete component (25) covers the middle of the outside of the test section (20). The test section is equipped with a test station (27). The first test section (21), the second test section (22), and the third test section (23) are all straight-walled circular arch tubular structures. The straight-walled circular arch tubular structure is composed of a bottom wall, vertical side walls, and an arc-shaped arch top that are fixed together. The bottom wall is set horizontally, and the arc-shaped arch top is set above the bottom wall. The two sides of the bottom wall are connected to the two sides of the arc-shaped arch top through vertical side walls. The inner diameter of the arc-shaped arch top of the first test section (21) is smaller than that of the second test section (22), and the inner diameter of the arc-shaped arch top of the second test section (22) is smaller than that of the third test section (23). The left end of the charge test section (20) is connected to the drive section detonation chamber of the nuclear explosion shock wave simulation test system through an external diaphragm installation section. The right end of the charge test section (20) is connected to the first test section (21) through a first variable diameter section (201). The right end of the first test section (21) is connected to the second test section (22) through a second variable diameter section (202). The right end of the second test section (22) is connected to the third variable diameter section (203). A reaction frame (4) is provided between the right end of the third variable diameter section (203) and the left end of the third test section (23). A reaction wall (5) and a reaction gap adjustment bracket (6) are provided at the right end of the third test section (23). The reaction gap adjustment bracket (6) is located between the third test section (23) and the reaction wall (5).

2. The steel structure test section for a nuclear explosion shock wave simulation test system according to claim 1, characterized in that: The first test section (21) has a first stiffening plate fixedly covering its bottom wall, and the two side walls of the first test section (21) are fixedly covered with second stiffening plates. The first stiffening plate and the two second stiffening plates are fixedly connected to form a U-shaped frame structure with the opening facing upward. The second test section (22) has a third stiffening plate fixedly covering its bottom wall, and the two side walls of the second test section (22) are fixedly covered with fourth stiffening plates. The third stiffening plate and the two fourth stiffening plates are fixedly connected to form a U-shaped frame structure with the opening facing upward. The third test section (23) has a fifth stiffening plate fixedly covering its bottom wall, and the two side walls of the third test section (23) are fixedly covered with sixth stiffening plates. The fifth stiffening plate and the two sixth stiffening plates are fixedly connected to form a U-shaped frame structure with the opening facing upward.

3. The steel structure test section for a nuclear explosion shock wave simulation test system according to claim 2, characterized in that: The first test section (21) is fixedly connected to a first flange and a second flange at both ends, and the first stiffener and the second stiffener are fixedly connected to the first flange and the second flange at both ends, respectively; the second test section (22) is fixedly connected to a third flange and a fourth flange at both ends, and the third stiffener and the fourth stiffener are fixedly connected to the third flange and the fourth flange at both ends, respectively; the third test section (23) is fixedly connected to a fifth flange and a sixth flange at both ends, and the fifth stiffener and the sixth stiffener are fixedly connected to the fifth flange and the sixth flange at both ends, respectively.

4. The steel structure test section for a nuclear explosion shock wave simulation test system according to claim 1, characterized in that: The first diameter-changing section (201), the second diameter-changing section (202), and the third diameter-changing section (203) are all straight-walled arched diameter-changing pipe structures. The straight-walled arched diameter-changing pipe structure is composed of a base plate, vertical side plates, and an arc-shaped arched top plate that are fixed together. The inner diameter of the left end of the arc-shaped arched top plate is smaller than the inner diameter of the right end. The base plate is set horizontally, and the arc-shaped arched top plate is set above the base plate. The two sides of the base plate are connected to the two sides of the arc-shaped arched top plate through vertical side plates respectively. The first diameter-changing section (201) has a seventh stiffening plate fixedly covering its bottom wall, and the outer sides of both sides of the first diameter-changing section (201) are fixedly covered with eighth stiffening plates. The seventh stiffening plate and the two eighth stiffening plates are fixedly connected to form a U-shaped frame structure with an upward opening. The second diameter-changing section (202) has a ninth stiffening plate fixedly covering its bottom wall, and the outer sides of both sides of the second diameter-changing section (202) are fixedly covered with tenth stiffening plates. The ninth stiffening plate and the two tenth stiffening plates are fixedly connected to form a U-shaped frame structure with an upward opening. The third diameter-changing section (203) has an eleventh stiffening plate fixedly covering its bottom wall, and the outer sides of both sides of the third diameter-changing section (203) are fixedly covered with twelfth stiffening plates. The eleventh stiffening plate and the two twelfth stiffening plates are fixedly connected to form a U-shaped frame structure with an upward opening.

5. A steel structure test section for a nuclear explosion shock wave simulation test system according to claim 4, characterized in that: The first diameter-changing section (201) is fixedly connected to the seventh flange and the eighth flange at both ends, and the seventh stiffener and the eighth stiffener are fixedly connected to the seventh flange and the eighth flange at both ends, respectively; the second diameter-changing section (202) is fixedly connected to the ninth flange and the tenth flange at both ends, and the ninth stiffener and the tenth stiffener are fixedly connected to the ninth flange and the tenth flange at both ends, respectively; the third diameter-changing section (203) is fixedly connected to the eleventh flange and the twelfth flange at both ends, and the eleventh stiffener and the second stiffener are fixedly connected to the eleventh flange and the twelfth flange at both ends, respectively.

6. A steel structure test section for a nuclear explosion shock wave simulation test system according to claim 1, characterized in that: The reaction frame (4) includes a fixed support frame (41), a bracket (42), a vertical beam (43), and a horizontal beam (44). The fixed support frame (41) is fixed to the ground, and the bracket (42) is fixed to the upper surface of the fixed support frame (41). The bracket (42) is a vertical plate frame structure. Its right side is fixed to the left end of the third test section (23), and its left side is provided with a panel (421). The panel (421) has a doorway (425) in the middle for installing and testing equipment. A vertical beam (43) is provided on each side of the doorway (425). Each of the two vertical beams (43) has a side plate (431) on its opposite side; the panel (421) above the doorway (425) is fixedly connected to a crossbeam (44), the two ends of the crossbeam (44) are respectively connected to the upper ends of the two vertical beams (43), and a flat plate (441) is provided on the lower surface of the crossbeam (44); a base plate (411) is provided on the fixed support frame (41) below the doorway (425), and the side plate (431), flat plate (441), base plate (411), and panel (421) form a closed cavity with an opening only on the left side.

7. A steel structure test section for a nuclear explosion shock wave simulation test system according to claim 1, characterized in that: The reaction gap adjustment bracket (6) is in the form of two brackets, which are located on both sides of the tail end of the third test section (23). The reaction gap adjustment bracket (6) is composed of a vertical frame (61) and a top rod (62). The vertical frame (61) is a vertical frame structure perpendicular to the reaction wall (5). One end of the frame abuts against the reaction wall (5), and the other end is provided with multiple vertically arranged positioning and mounting holes. The top rod (62) is threadedly connected to a positioning and mounting hole, and the other end of the top rod (62) abuts against the third test section (23).

8. A steel structure test section for a nuclear explosion shock wave simulation test system according to claim 4, characterized in that: The lower parts of the first variable diameter section (201), the first test section (21), the second variable diameter section (202), the second test section (22), the third variable diameter section (203), and the third test section (23) are respectively provided with steel frames (26) and are fixed to the ground by the corresponding steel frames (26).

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