Device and method for underwater explosion test of plate specimens

Abstract

The present invention relates to a device and method for underwater explosion test of plate-like specimens, comprising a pedestal for fixing the plate-like specimens, wherein the pedestal is an internal hollow structure, the internal hollow part of the pedestal is used to simulate the air part of an underwater tunnel or a fortification structure, and the open end is not closed; a square opening is provided on a wall of the pedestal near the bottom of the pedestal, and the plate-like specimen is detachably mounted at the square opening through a fixing device; when the pedestal is fixed in an explosion test pool for testing, a displacement sensor and an acceleration sensor are mounted on the back explosion surface of the plate-like specimen located in the pedestal cavity through the open end of the pedestal; and a reflection pressure sensor is mounted on the front explosion surface of the plate-like specimen; the present invention meets the test requirements for underwater explosion of plate-like specimens and improves the accuracy of the test.

Description

Technical Field

[0001] The invention relates to a device and a method for underwater explosion test of a plate-type specimen, belonging to the technical field of underwater explosion test. Background Art

[0002] In recent years, the application of underwater reinforced concrete box structures and steel plate concrete composite structures has increased, such as underwater tunnels, underwater fortifications, etc. Once such structures are attacked by underwater explosions, they are likely to be seriously damaged, resulting in loss of life and property and extremely adverse social impacts. As the main load-bearing component of the structure, the plate is the focus of research. Therefore, it is very necessary to carry out experimental research on the performance of plate components such as steel plates, reinforced concrete plates and composite plates under the action of underwater explosions.

[0003] At present, the main methods for fixing specimens in the underwater explosion test of plate-like components are: (1) setting up a four-legged support steel frame to fix the specimen; (2) fixing the specimen on the opening side of the sealed steel box by high-strength bolts; (3) casting the integral reinforced concrete structure. The above methods have the following shortcomings in underwater explosion tests: The first method completely immerses the specimen in water, and the test environment does not conform to the actual situation, that is, it cannot simulate the underwater tunnel structure with one side of the tunnel body and the other side of the water body, which is out of engineering context. The second method is only applicable to the test of steel plates. Since the specimen is fixed on a sealed steel box, the installation of the dynamic response sensor of the specimen is extremely difficult, and the lead wire of the steel box opening is more likely to cause water ingress. The third method is applicable to the test of the integral structure, but the plate specimen cannot be replaced, so the adaptability is poor and the test cost is high. Therefore, a new test device is urgently needed to meet the test requirements of underwater explosion of plate-like specimens. Summary of the invention

[0004] The present invention provides a device and method for underwater explosion testing of plate-type specimens, which meets the test requirements of underwater explosion of plate-type specimens and improves the accuracy of the test.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A device for underwater explosion test of plate-like specimens, comprising a pedestal for fixing the plate-like specimens, the pedestal being an internal hollow structure, the internal hollow part of the pedestal being used to simulate the air part of an underwater tunnel or fortification structure, and the open end thereof being not closed;

[0007] A square opening is provided on a wall of the pedestal near the bottom of the pedestal, and a plate-type test piece can be detachably installed at the square opening through a fixing device;

[0008] When the pedestal is fixed in the explosion test pool for testing, the open end of the pedestal is extended into the hollow inner cavity of the pedestal, and a displacement sensor and an acceleration sensor are installed on the back explosion surface of the plate specimen located in the inner cavity of the pedestal;

[0009] Install a reflection pressure sensor on the explosion-facing surface of the plate specimen;

[0010] As a further preferred embodiment of the present invention, the pedestal is arranged in a box-shaped structure, and the other three walls of the pedestal without square openings are arranged in a trapezoidal structure, and the width of the bottom of the wall is greater than the width of the top;

[0011] The bottom of the wall of the pedestal with a square opening is extended outward in a horizontal direction to form an extension section;

[0012] As a further preferred embodiment of the present invention, the fixing device comprises a rubber waterstop and a square steel plate flange, the rubber waterstop is arranged around the square opening, the square steel plate flange is covered on the surface of the rubber waterstop, and a space for fixing the plate-type test piece is formed between the rubber waterstop and the square steel plate flange;

[0013] The plate specimen is placed on the surface of the extension section and supported by the extension section;

[0014] As a further preferred embodiment of the present invention, a plurality of bolt holes with equal spacing are provided around the square opening of the pedestal, and in each bolt hole, a high-strength bolt is sequentially passed through a square steel plate flange, a plate-type test piece, and a rubber water stop strip and directly embedded in the cavity of the pedestal;

[0015] As a further preferred embodiment of the present invention, a bottom plate is provided at the bottom of the pedestal, and the side edge of the bottom plate exceeds the bottom surface of the pedestal;

[0016] The distance of the bottom plate extending out from the side where the square opening is provided matches the extension section;

[0017] The bottom plates on the two wall sides adjacent to the wall with the square opening also extend out of the bottom of the pedestal. Vertical columns are arranged on the right-angled sides of the wall with the square opening and the adjacent wall, and the vertical columns are supported by the bottom plates.

[0018] As a further preferred embodiment of the present invention, on the pedestal, another wall opposite to the wall with the square opening has angle steels embedded on the right-angled sides of both sides of the wall;

[0019] Angle steels are embedded in the right-angle sides of the bottom plate on both sides of the square opening;

[0020] A vertical angle steel is embedded in the center of the bottom surface of the base plate;

[0021] As a further preferred embodiment of the present invention, a test piece dynamic sensor can be detachably installed at the angle steel pre-buried at the center of the bottom surface of the base plate;

[0022] The method using the device for underwater explosion test of plate specimens specifically comprises the following steps:

[0023] Step S1: The pedestal is made of high-strength reinforced concrete, and the opening wall of the pedestal is subjected to explosion-proof reinforcement and curing. After curing for a preset time, it is hoisted into an explosion test pool without water, and the pedestal is fixed to the side wall of the explosion test pool by welding at the position where the angle steel is installed on the pedestal. The bottom of the pedestal is fixed to the bottom of the explosion test pool by welding the angle steel and punching holes in the ground nails; Step S2: High-strength bolts are sequentially penetrated through the square steel plate flange, the plate specimen and the rubber water stop, and the plate specimen is fixed to the square opening of the pedestal;

[0024] Step S3: installing a free-field pressure sensor at a preset position in the explosion test pool, installing a displacement sensor and an acceleration sensor on the back explosion surface of the plate-type specimen, and installing a reflection pressure sensor on the front explosion surface of the plate-type specimen, leading the cables of the free-field pressure sensor, the displacement sensor, the acceleration sensor, and the reflection pressure sensor along the wall of the explosion test pool to connect to the dynamic data acquisition system to perform a trigger test;

[0025] Step S4: After the trigger test result meets the preset value, water is injected into the explosion test pool, and the amount of water injected is determined according to the test conditions;

[0026] Step S5: hanging explosives into a preset position in the explosion test pool to carry out an underwater explosion test;

[0027] Step S6: After the underwater explosion test is completed, the water in the explosion test pool is drained, the damage of the plate test piece is observed, and the plate test piece is disassembled, and step S2 is repeated to cycle the underwater explosion test;

[0028] As a further preferred embodiment of the present invention, the explosion-proof reinforcement of the opening wall of the pedestal includes embedding a steel plate, or applying a polyurea material on the wall surface.

[0029] Through the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The device for underwater explosion test of plate specimens provided by the present invention is designed to have a hollow internal structure and a box-type structure for fixing the plate specimens. During the test, the inside is air and the outside is water, simulating the actual working conditions of the underwater tunnel and improving the accuracy of the simulation test.

[0031] 2. The device for underwater explosion test of plate specimens provided by the present invention has a fixing device which is tightly connected with the pedestal by sequentially penetrating a square steel plate flange, a plate specimen, and a rubber water stop with high-strength bolts, so that various plate specimens can be fixed and disassembled, thereby performing explosion tests on various plate specimens; the setting of the rubber water stop can ensure the fit between the plate specimen and the pedestal, and ensure the airtightness of the inner side of the pedestal during the test;

[0032] 3. In the device for underwater explosion test of plate-like specimens provided by the present invention, the open end of the pedestal is not closed, which facilitates the installation of a dynamic response sensor inside the plate-like specimen, realizes the collection of dynamic response data of the specimen, and improves the accuracy of the test;

[0033] 4. The device for underwater explosion test of plate specimens provided by the present invention has a simple structure, low manufacturing cost, convenient assembly and disassembly, and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0035] Figure 1 is a disassembly schematic diagram of a preferred embodiment provided by the present invention;

[0036] Figure 2 It is an overall installation diagram of a preferred embodiment provided by the present invention.

[0037] In the figure: 1 is a pedestal, 2 is a rubber water stop, 3 is a square steel plate flange, 4 is a high-strength bolt, 5 is a plate specimen, and 6 is an angle steel. DETAILED DESCRIPTION

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and therefore cannot be understood as a limitation on the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution by example, and do not limit the scope of protection of the present invention.

[0039] In the background technology, the applicant clearly explained the current multiple problems regarding the fixing method of plate-type components during underwater explosion tests, such as the inability to truly simulate the actual working conditions of underwater tunnels, the inability to replace various types of plate-type specimens 5 (including steel plates, reinforced concrete slabs, and steel-concrete composite slabs, etc.) used to simulate underwater explosion tests, and the inability to collect dynamic response data of the specimens; all of the above problems have led to the inability to meet the needs of underwater explosion tests of plate-type specimens.

[0040] like Figure 1-Figure 2 As shown, it is a schematic diagram of the device for underwater explosion test of plate-like specimens provided by the present application. The first highlight of the structure of the present application is that the pedestal 1 for fixing the plate-like specimen is a box structure with a hollow interior, and a square opening is opened near the bottom of the pedestal on a wall of the pedestal, and the plate-like specimen can be detachably installed at the square opening through a fixing device; the box structure with a hollow interior can simulate the real working condition environment of an underwater tunnel with air on one side and water on the other side, and the design of detachably installing the plate-like specimen at the square opening can meet the test simulation of various types of plate-like specimens. It can be clearly seen from the figure in the present application that the top open end of the pedestal is not closed. When the plate-like specimen is fixed on the pedestal, the entire pedestal is placed in the explosion test pool for the test. In order to more accurately understand the state of the plate-like specimen during the explosion, it is necessary to collect the real-time response data of the plate-like specimen. Therefore, the unclosed open end can still be freely installed with relevant sensors for collecting data when the plate-like specimen is in the test environment.

[0041] Next, each component in the device of the present application is elaborated in detail. First, the pedestal is arranged in a box-shaped structure. Among the other three walls of the pedestal without square openings, the walls are arranged in a trapezoidal structure, and the width of the bottom of the wall is greater than the width of the top. The design method of the lower side of the wall is greater than the upper side can ensure the stability of the bottom of the pedestal, and it is also convenient for test personnel to enter and exit the pedestal after the test piece is installed; the wall with a square opening on the pedestal is reinforced against explosion, such as embedding a steel plate or applying polyurea and other materials on the wall; the bottom of the wall extends outward in a horizontal direction to form an extension section, and the extension section here provides installation support for plate-type test pieces.

[0042] In the present application, the fixing device includes a rubber waterstop 2 and a square steel plate flange 3. The rubber waterstop is arranged around the square opening, and the square steel plate flange is covered on the surface of the rubber waterstop, so that a space for fixing the plate-like specimen is formed between the rubber waterstop and the square steel plate flange; the square steel plate flange fixes the four sides of the plate-like specimen, and when the plate-like specimen is fixed on the pedestal, the rubber waterstop makes the plate-like specimen fit more closely with the pedestal, ensuring the airtightness of the inner side of the pedestal; the structural setting of the square steel plate flange can fix different types of plate-like specimens, and has wide applicability. Here, the fixing method of the plate-like specimen is to open a number of equally spaced bolt holes around the square opening of the pedestal, and in each bolt hole, a high-strength bolt 4 is sequentially passed through the square steel plate flange, the plate-like specimen and the rubber waterstop and directly embedded in the cavity of the pedestal.

[0043] The aforementioned extension section also requires relevant support. In this application, a bottom plate is set at the bottom of the pedestal, and the side of the bottom plate exceeds the bottom surface of the pedestal; the distance of the bottom plate on the side with the square opening matches the extension section; the bottom plates on the two wall sides adjacent to the wall with the square opening also extend out of the bottom of the pedestal, and columns are set at the right angles of the wall with the square opening and the adjacent wall, and the columns are supported by the bottom plate. The columns connect the wall with the square opening and the adjacent wall to form an integral structure, which improves the stability of the fixed plate specimen.

[0044] Since the pedestal is to be installed and fixed in the explosion test pool, the present application provides a relatively low-cost installation and fixing method. On the pedestal, another wall opposite to the wall with the square opening is provided with angle steels 6 on the right angle sides of the wall; angle steels are respectively embedded in the right angle sides of the bottom plate on both sides of the square opening; and angle steels are embedded in the center of the bottom surface of the bottom plate. The arrangement of these angle steel parts is the connection point for fixing the pedestal in the explosion test pool in the future.

[0045] When the pedestal is fixed in the explosion test pool for testing, the open end of the pedestal is extended into the hollow inner cavity of the pedestal, and a displacement sensor and an acceleration sensor are installed on the back explosion surface of the plate specimen located in the inner cavity of the pedestal; a reflection pressure sensor is installed on the front explosion surface of the plate specimen. The specimen dynamic sensor can be detachably installed at the vertical angle steel pre-buried in the center of the bottom surface of the base plate. Each sensor is connected to the dynamic data acquisition system through a wire to obtain the status of the plate specimen during the explosion test in real time.

[0046] Finally, the present application also provides a method for implementing the above device, which specifically includes the following steps:

[0047] Step S1: The pedestal is made of high-strength reinforced concrete, and the opening wall of the pedestal is reinforced against explosion, such as embedding steel plates or applying polyurea and other materials on the wall; the pedestal is cured, and after the curing time reaches a preset time, it is hoisted into the explosion test pool that is not filled with water, and the pedestal is fixed to the side wall of the explosion test pool by welding at the position where the angle steel is embedded in the pedestal, and the bottom of the pedestal is fixed to the bottom of the explosion test pool by welding the angle steel and punching holes in the ground nails;

[0048] Step S2: High-strength bolts are sequentially passed through the square steel plate flange, the plate specimen, and the rubber water stop to fix the plate specimen at the square opening of the pedestal;

[0049] Step S3: installing a free-field pressure sensor at a preset position in the explosion test pool, installing a displacement sensor and an acceleration sensor on the back explosion surface of the plate-type specimen, and installing a reflection pressure sensor on the front explosion surface of the plate-type specimen, leading the cables of the free-field pressure sensor, the displacement sensor, the acceleration sensor, and the reflection pressure sensor along the wall of the explosion test pool to connect to the dynamic data acquisition system to perform a trigger test;

[0050] Step S4: After the trigger test result meets the preset value, water is injected into the explosion test pool, and the amount of water injected is determined according to the test conditions;

[0051] Step S5: hanging explosives into a preset position in the explosion test pool to carry out an underwater explosion test;

[0052] Step S6: After the underwater explosion test is completed, the water in the explosion test pool is drained, the damage of the plate specimens is observed, and the plate specimens are disassembled, and step S2 is repeated to cycle the underwater explosion test.

[0053] In summary, the device for underwater explosion testing of plate specimens provided in the present application is capable of fixing and disassembling plate specimens (steel plates, reinforced concrete plates and steel-concrete composite plates, etc.) in underwater explosion tests, simulating the real underwater box-type structure environment (air inside and water outside), and collecting dynamic response data of the specimens, and has strong applicability.

[0054] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0055] The meaning of "and / or" described in this application means that the situations where each exists alone or both exist at the same time are included.

[0056] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0057] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A device for underwater explosion test of plate specimens, Features: Including a pedestal for fixing plate-type specimens, the pedestal is an internal hollow structure, the internal hollow part of the pedestal is used to simulate the air part of an underwater tunnel or fortification structure, and the open end is not closed; A square opening is provided on a wall of the pedestal near the bottom of the pedestal, and a plate-type test piece can be detachably installed at the square opening through a fixing device; When the pedestal is fixed in the explosion test pool for testing, the open end of the pedestal is extended into the hollow inner cavity of the pedestal, and a displacement sensor and an acceleration sensor are installed on the back explosion surface of the plate specimen located in the inner cavity of the pedestal; A reflection pressure sensor is installed on the explosion-facing surface of the plate specimen.

2. The device for underwater explosion test of plate specimens according to claim 1, Features: The pedestal is arranged in a box-shaped structure, and the other three walls of the pedestal without square openings are arranged in a trapezoidal structure, and the width of the bottom of the wall is greater than the width of the top; The bottom of the wall of the pedestal with a square opening is extended outward in a horizontal direction to form an extension section.

3. The device for underwater explosion test of plate specimens according to claim 2, Features: The fixing device comprises a rubber water stop and a square steel plate flange. The rubber water stop is arranged around the square opening. The square steel plate flange is covered on the surface of the rubber water stop, and a space for fixing the plate-type test piece is formed between the rubber water stop and the square steel plate flange. The plate specimen is placed on the surface of the extension section and supported by the extension section.

4. The device for underwater explosion test of plate specimens according to claim 3, Features: A number of equally spaced bolt holes are provided around the square opening of the pedestal. In each bolt hole, high-strength bolts are sequentially passed through a square steel plate flange, a plate specimen and a rubber water stop and directly embedded in the cavity of the pedestal.

5. The device for underwater explosion test of plate specimens according to claim 4, Features: A bottom plate is arranged at the bottom of the pedestal, and the side edge of the bottom plate exceeds the bottom surface of the pedestal; The distance of the bottom plate extending out from the side where the square opening is provided matches the extension section; The bottom plates on the two wall sides adjacent to the wall with the square opening also extend out of the bottom of the pedestal. Vertical columns are arranged on the right-angle sides of the wall with the square opening and the adjacent wall, and the vertical columns are supported by the bottom plates.

6. The device for underwater explosion test of plate specimens according to claim 4, Features: On the pedestal, another wall opposite to the wall with the square opening is provided, and angle steels are embedded on the right-angled sides of both sides of the wall; Angle steels are embedded in the right-angle sides of the bottom plate on both sides of the square opening; Vertical angle steel is embedded in the center of the bottom surface of the base plate.

7. The device for underwater explosion test of plate specimens according to claim 5, Features: The dynamic sensor of the specimen can be detachably installed at the vertical angle steel embedded in the center of the bottom surface of the base plate.

8. A method for implementing the device of claim 6, Features: The specific steps include: Step S1: The pedestal is made of high-strength reinforced concrete, and the opening wall of the pedestal is reinforced against explosion and cured. After curing for a preset time, it is hoisted into an explosion test pool that is not filled with water, and the pedestal is fixed to the side wall of the explosion test pool by welding at the position where the angle steel is installed on the pedestal. The bottom of the pedestal is fixed to the bottom of the explosion test pool by welding the angle steel and punching holes in the ground nails; Step S2: High-strength bolts are sequentially passed through the square steel plate flange, the plate specimen, and the rubber water stop to fix the plate specimen at the square opening of the pedestal; Step S3: installing a free-field pressure sensor at a preset position in the explosion test pool, installing a displacement sensor and an acceleration sensor on the back explosion surface of the plate-type specimen, and installing a reflection pressure sensor on the front explosion surface of the plate-type specimen, leading the cables of the free-field pressure sensor, the displacement sensor, the acceleration sensor, and the reflection pressure sensor along the wall of the explosion test pool to connect to the dynamic data acquisition system to perform a trigger test; Step S4: After the trigger test result meets the preset value, water is injected into the explosion test pool, and the amount of water injected is determined according to the test conditions; Step S5: hanging explosives into a preset position in the explosion test pool to carry out an underwater explosion test; Step S6: After the underwater explosion test is completed, the water in the explosion test pool is drained, the damage of the plate specimens is observed, and the plate specimens are disassembled, and step S2 is repeated to cycle the underwater explosion test.

9. The method according to claim 8, Features: Methods of blast-proofing the pedestal opening wall include embedding steel plates or applying polyurea material to the wall surface.

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