A concrete test block strength testing device

Abstract

The present invention discloses a concrete test block strength testing device, which belongs to the technical field of civil engineering material testing equipment. It includes an external frame mechanism, a support module and a vertical loading mechanism, and is provided with an external motor and a reciprocating friction component. The edge area of ​​the test block is reciprocated by means of an inclined contact edge, simulating the stress state of the concrete edge under actual stress conditions such as bending and shearing, and can accurately detect its flexural strength and elastic modulus. The friction loading mechanism is used to measure the elastic modulus and micro-crack expansion characteristics of the local edge of the test block, providing test data support for structural analysis, material selection and durability evaluation. The device can be flipped 90 degrees as a whole and tested in a horizontal posture, more realistically simulating the working stress state of beam-slab concrete components, improving the engineering representativeness and application value of the test results. After the test is completed, the test blocks are orderly classified and temporarily stored through the cooperation of the flippable support arm and the storage structure.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering material testing equipment, in particular to a concrete test block strength testing device. Background Art

[0002] As one of the most widely used structural materials in modern construction, concrete's mechanical properties directly impact the safety and durability of the entire structural system. To ensure that concrete components meet design strength requirements, strength testing of concrete specimens is often required before, during, and after construction, particularly for key performance indicators such as compressive strength, flexural strength, and elastic modulus.

[0003] Currently, strength testing of concrete test blocks primarily relies on traditional presses or flexural testing equipment, typically using manual clamping and separate loading. This approach presents the following significant issues: unstable clamping of the test blocks can easily lead to slippage or offset, affecting loading accuracy and test results; a lack of testing capabilities for the test block's edges or localized areas, making it impossible to accurately assess edge flexural performance or localized elastic response; and a single device structure that is unable to achieve multi-angle axial and lateral loading, making it difficult to simulate the mechanical behavior of actual components under complex load conditions.

[0004] With the continuous improvement of the safety assessment standards for concrete structures, there is an urgent need for a multifunctional testing equipment with a reasonable structure, strong adaptability, and the ability to automatically load, self-align, and detect edge responses, so as to improve the efficiency, accuracy, and engineering applicability of the mechanical properties test of concrete specimens. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a concrete test block strength testing device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A concrete test block strength testing device comprises an external frame mechanism, a support module and a vertical loading mechanism, wherein the support module is installed in the inner cavity of the external frame mechanism, and the vertical loading mechanism is vertically arranged in the middle position of the support module, the support module comprises a main load-bearing bracket and an arrangement and forming mechanism installed on the side end face of the main load-bearing bracket, the bottom edge position of the main load-bearing bracket is extended to install a support platform connecting plate, the upper end face of the support platform connecting plate is arranged to vertically lay a load-bearing plate, and the other end of the load-bearing plate is connected to the main load-bearing bracket through a transverse connecting rod, the concrete test block that needs to be strength tested is placed directly above the concrete test block placement platform, because the upper part of the inclined triangular limiting component is set as a triangle, the concrete test block is placed on the inclined side, and through vertical loading The overall movement of the mechanism drives the loading moving assembly and the bottom loading response mechanism to move in the same direction. A concrete test block for pressing is placed in the gap between the two sets of upper loading platforms. When the weight of the concrete test block presses the upper loading platform and the upper and lower loading connectors downward, the vertical slider at the bottom moves downward along the vertical slide rail. While pressing downward, the vertical loading mechanism can push the loading moving assembly downward to move in the same direction, playing a role of self-positioning and stable support, effectively preventing the test block from sliding or offsetting during the detection process. Through the overall movement of the vertical loading mechanism of the upper structure, the loading moving assembly of the lower connecting component and the bottom loading response mechanism are driven to move in the same direction in coordination, thereby realizing synchronous loading of multiple components, simplifying the operator's operating process, and improving loading efficiency and structural coordination.

[0008] The support module further includes a transverse connecting shaft connected to the interval between two transverse connecting rods arranged opposite to each other in the transverse direction. The outer rings of the four transverse connecting shafts are slidably connected to a sliding outer ring assembly. The sliding outer ring assembly includes four groups of arranged sliding seats and sliding connecting plates A and B for connecting the four groups of sliding seats.

[0009] A loading and moving assembly is vertically inserted at the interval between the two groups of sliding connecting plates B. The loading and moving assembly includes two groups of magnetic loading columns. A central loading rod is inserted in the middle position of the two groups of magnetic loading columns. The outer rings of the two groups of magnetic loading columns are slidably sleeved with height adjustment parts. The staff can vertically adjust the height adjustment parts sleeved on the outer rings of the magnetic loading columns according to the weight of the concrete test block being tested. When the concrete test block to be pressed is larger than the one placed on the concrete test block placement platform at the base, the height adjustment member can be lifted upward, thereby extending the length of the magnetic loading column below it. This allows the bottom of the central loading rod to closely contact the upper surface of the concrete test block. Under the action of the gravity of the concrete test block above, the two sets of magnetic loading columns will apply pressure to both sides along the upper end surface of the test block. The bottom end surfaces of the two sets of magnetic loading columns and the reciprocating friction component apply pressure symmetrically along the upper end surface of the test block. This effectively ensures that the test block is subjected to uniform force during the test process, avoiding structural damage or misjudgment caused by biased pressure, thereby achieving compression testing of the concrete test block. During the test process, axial compressive strength is measured by applying axial pressure to the test block. This strength more accurately reflects the bearing capacity of concrete in actual axially compressed components and has direct reference value for the design and evaluation of compression components of concrete structures. By allowing the test block to undergo a certain amount of bending deformation during the compression process, or by adjusting the placement and loading method of the test block, the flexural strength of the concrete can also be indirectly tested. Flexural strength reflects the ability of concrete to resist bending failure and is of great significance for evaluating the bending members and crack resistance of concrete structures.

[0010] During the test, the test block is in an axially compressed state, which can more realistically reflect the stress condition of the structural components in the project and provide a reliable basis for the design and verification of concrete structures. By adjusting the loading method or the placement of the test block, the test block can be guided to produce a bending effect, thereby indirectly evaluating the flexural strength of the concrete, which is suitable for the analysis of curved components.

[0011] When the size of the concrete test block used for pressing is smaller than or equal to the test block placed on the concrete test block placement platform of the base, the height adjustment piece can be moved downward to the bottom position of the magnetic loading column, so that the magnetic loading column and the center loading rod can press the concrete test block downward at the same time for testing. No special fixtures need to be prepared, and test blocks of different specifications can be tested, which expands the scope of application of the equipment, can stably apply pressure to small test blocks, ensure uniform distribution of force, thereby obtaining more accurate strength data, and avoiding measurement errors or detection difficulties caused by small test block size. During the test process, the cooperation of the magnetic loading column and the center loading rod can reduce the offset or tilt of the test block when under pressure, and improve the repeatability and reliability of the test, which is especially important for small-sized test blocks because they are more susceptible to uneven force distribution.

[0012] Preferably, the main supporting bracket includes a bracket body and a reversible support arm mounted on the upper end surface of the bracket body. The two sets of oppositely arranged reversible support arms are hinged and connected in series via a hinge shaft. When the concrete test block is tested, the two sets of reversible support arms arranged on both sides of the device can be flipped around the hinge shaft below them as a rotation fulcrum, thereby rotating the originally vertically installed main supporting bracket to a horizontal parallel placement state. After the flip is completed, the tested concrete test block can be placed in the storage structure arrangement and forming mechanism for easy unified classification and management. At this time, the flipped main supporting bracket structure can also be used to support the end of the inclined triangular limit component of the upper structure, playing an auxiliary support role, enhancing the stability of the entire system and the convenience of subsequent operation.

[0013] Preferably, the bottom of the magnetic loading column is connected to the upper end surface of the bottom loading response mechanism, and the bottom loading response mechanism includes two sets of relatively arranged reciprocating friction components and inclined contact edges opened at the bottom positions of the two sets of reciprocating friction components.

[0014] Preferably, the upper end surface of one group of the reciprocating friction components is connected to the bottom of one side of the magnetic loading column, and the bottom positions of the two groups of the reciprocating friction components are set to a relative tilt angle.

[0015] Preferably, the external frame mechanism includes a side frame and a limiting bracket opened on both sides of the side frame, a transverse connecting piece is installed laterally on the inner end surface of the limiting bracket, a concrete test block placement platform is installed in the middle position of the bottom of the inner cavity of the side frame, the other end of the transverse connecting piece is attached to the upper end surface of the concrete test block placement platform, and the concrete test block placement platform is laterally inserted through the interval of the test plate.

[0016] Preferably, the concrete test block placement platform includes a base body and limiting mechanisms on both sides of the base installed on both sides of the side end surface edges of the base body, the other ends of the limiting mechanisms on both sides of the base are installed with limiting strips, and inclined triangular limiting components are installed at the intervals between the two groups of limiting strips.

[0017] Preferably, the vertical loading mechanism includes a vertical slide rail mounted vertically in the middle of the side end face of the side frame. The front end of the vertical slide rail vertically slides and connects to two sets of vertical sliders. The two sets of vertical sliders are provided with upper and lower loading connectors opposite each other. The other ends of the upper and lower loading connectors are provided with an upper loading platform. To further accurately detect the flexural strength and elastic modulus of the edge of the concrete test block, this device is equipped with a structured loading and friction response detection mechanism. This mechanism includes an external motor mounted in the middle of the upper loading platform, with its output end facing vertically downward. During operation, it generates periodic impact force through reciprocating drive.

[0018] The external motor impact-loads the upper loading platform, driving the vertical loading mechanism of the upper structure and the integral moving assembly connected below it to apply downward pressure. As the loading moving assembly moves downward, the reciprocating friction components of the structural components connected to its bottom begin to act on the edge area of ​​the concrete test block.

[0019] The reciprocating friction component features an inclined contact edge at its bottom. During movement, it creates oblique contact and friction with the edges of the concrete block, creating a force load. Driven by an external motor, the reciprocating friction component slides back and forth along the edges of the block, subjecting the edges of the concrete block to repeated loading.

[0020] This loading method simulates the complex stress state experienced by the specimen edge in an actual component, enabling testing of the concrete's edge flexural properties under local bending, shear, or combined forces. Furthermore, by measuring deformation during the stress process, the elastic modulus response of the concrete edge in that local area can be assessed, providing experimental data for high-precision structural analysis.

[0021] After flipping the entire device 90 degrees, a lateral load can be applied to the concrete test block, which is closer to the stress form of beam and slab concrete components in actual structures under working conditions, thereby improving the engineering adaptability and representativeness of the test results.

[0022] The device can complete testing operations in both vertical and horizontal postures, and is compatible with axial compressive strength testing and flexural, shear or lateral pressure strength testing, greatly enhancing the applicability and testing capabilities of the equipment. In the horizontal state, the edge of the test block has more complete contact with the structures on both sides, which is helpful for implementing refined analysis projects such as edge compression performance testing, local stress concentration research and microcrack expansion monitoring.

[0023] After flipping, the test block can be more stably inserted into the lateral limit device. Especially for long or non-standard test blocks, the risk of lateral deviation or sliding can be significantly reduced, and the repeatability of the test and the accuracy of the results can be enhanced. The same set of structures can be adapted to force testing in different directions after flipping, avoiding the configuration of multiple independent devices for different testing conditions, saving space and cost, and improving the comprehensive utilization rate of the equipment.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] By setting up inclined triangular limit components, the concrete test blocks placed on the platform can be automatically aligned and stably fitted under the action of gravity, avoiding the displacement of the test blocks during the detection process, improving the loading accuracy and test repeatability, and the vertical loading mechanism drives the loading moving assembly and the bottom loading response mechanism to achieve synchronous pressing, simplifying the operation process, improving loading efficiency, enhancing structural coordination performance, and reducing human intervention operations.

[0026] The height adjustment piece can adjust the effective length of the magnetic loading column to meet the loading requirements of test blocks of different sizes. There is no need to replace the clamping tools, which improves the adaptability of the equipment and saves testing time and equipment costs. For smaller test blocks, the height adjustment piece can be lowered to achieve synchronous loading of the magnetic loading column and the center loading rod, ensuring uniform force, avoiding misjudgment or data fluctuations caused by loading deviation, and improving detection reliability.

[0027] An external motor and a reciprocating friction component are set up to perform reciprocating loading on the edge area of ​​the test block with the help of an inclined contact edge, simulating the stress state of the concrete edge under actual stress conditions such as bending and shearing. Its flexural strength and elastic modulus can be accurately tested. The friction loading mechanism is used to measure the local elastic modulus and micro-crack extension characteristics of the test block edge, providing experimental data support for structural analysis, material selection and durability evaluation.

[0028] The device can be flipped 90 degrees as a whole and tested in a horizontal posture, which can more realistically simulate the working stress state of beam-slab concrete components, improve the engineering representativeness and application value of the test results. After the test is completed, the flippable support arm and the storage structure are used to complete the orderly classification and temporary storage of the test blocks, thereby improving the subsequent management efficiency; the flipped main load-bearing bracket can also serve as an auxiliary support for the upper limit structure to improve the stability of the device.

[0029] A single set of equipment is compatible with axial compression, flexural strength, lateral pressure and local stress testing, and is suitable for mechanical property evaluation of standard and non-standard test blocks. It greatly expands the testing scenarios and scope of use, and significantly improves the comprehensive utilization rate and cost-effectiveness of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of a concrete test block strength testing device proposed by the present invention;

[0031] Figure 2 This is a schematic diagram of the support module structure of a concrete test block strength testing device proposed by the present invention;

[0032] Figure 3 This is a schematic diagram of the external frame structure of a concrete test block strength testing device proposed by the present invention;

[0033] Figure 4 This is a structural schematic diagram of a concrete test block placement platform of a concrete test block strength testing device proposed by the present invention;

[0034] Figure 5 This is a schematic diagram of the combined structure of the sliding outer ring component and the loading and moving component of a concrete test block strength testing device proposed by the present invention;

[0035] Figure 6This is a schematic diagram of the structure of a loading and moving component of a concrete test block strength testing device proposed by the present invention;

[0036] Figure 7 This is a schematic diagram of the deformation structure of the loading and moving component of a concrete test block strength testing device proposed by the present invention;

[0037] Figure 8 This is a schematic diagram of the bottom loading response mechanism structure of a concrete test block strength testing device proposed by the present invention;

[0038] Figure 9 This is a schematic structural diagram of a vertical loading mechanism of a concrete test block strength testing device proposed by the present invention;

[0039] Figure 10 This is a schematic diagram of the overall structure of a concrete test block strength testing device proposed by the present invention.

[0040] In the figure: 1. External frame mechanism; 11. Side frame; 12. Limiting bracket; 13. Concrete test block placement platform; 131. Base body; 132. Limiting mechanisms on both sides of the base; 133. Limiting strips; 134. Inclined triangular limiting components; 14. Horizontal connector; 2. Support module; 21. Main load-bearing bracket; 211. Bracket body; 212. Reversible support arm; 213. Articulated shaft; 22. Arrangement and forming mechanism; 23. Support platform connecting plate; 24. Test plate; 25. Horizontal connector Connecting rod; 26. Horizontal connecting shaft; 27. Sliding outer ring assembly; 271. Sliding seat; 272. Sliding connecting plate A; 273. Sliding connecting plate B; 28. Loading moving assembly; 281. Magnetic loading column; 282. Center loading rod; 283. Height adjustment member; 29. ​​Bottom loading response mechanism; 291. Reciprocating friction component; 292. Inclined contact edge; 3. Vertical loading mechanism; 31. Vertical slide rail; 32. Vertical slider; 33. Upper and lower loading connectors; 34. Upper loading platform. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Reference Figures 1-10, Example 1, a concrete test block strength testing device, including an external frame mechanism 1, a support module 2 and a vertical loading mechanism 3, the support module 2 is installed in the inner cavity of the external frame mechanism 1, the vertical loading mechanism 3 is vertically arranged in the middle position of the support module 2, the support module 2 includes a main load-bearing bracket 21 and an arrangement molding mechanism 22 installed on the side end surface of the main load-bearing bracket 21, the bottom edge position of the main load-bearing bracket 21 is extended to install a support platform connecting plate 23, the upper end surface of the support platform connecting plate 23 is arranged with a vertically laid test plate 24, the other end of the test plate 24 is connected to the main load-bearing bracket 21 through a horizontal connecting rod 25, the concrete test block that needs to be tested for strength is placed directly above the concrete test block placement platform 13, because the upper part of the inclined triangular limiting component 134 is set as a triangle, the concrete test block is placed on the inclined side, through the vertical The overall movement of the loading mechanism 3 drives the loading moving assembly 28 and the bottom loading response mechanism 29 to move in the same direction. A concrete test block for pressing is placed in the gap between the two groups of upper loading platforms 34. When the weight of the concrete test block presses the upper loading platform 34 and the upper and lower loading connectors 33 downward, the vertical slider 32 at the bottom moves downward along the vertical slide rail 31. While pressing downward, the vertical loading mechanism 3 can push the loading moving assembly 28 downward to move in the same direction, playing the role of self-positioning and stable support, effectively preventing the test block from sliding or offsetting during the detection process. Through the overall movement of the vertical loading mechanism 3 of the upper structure, the loading moving assembly 28 of the lower connecting component and the bottom loading response mechanism 29 are driven to move in the same direction in coordination, realizing synchronous loading of multiple components, simplifying the operator's operating process, and improving loading efficiency and structural coordination.

[0043] In embodiment 2, the support module 2 further includes a transverse connecting shaft 26 connected to the intervals between the two transverse connecting rods 25 arranged opposite to each other in the transverse direction, and the outer rings of the four transverse connecting shafts 26 are slidably connected to the sliding outer ring assembly 27;

[0044] The sliding outer ring assembly 27 includes four groups of sliding seats 271 arranged in an array and a sliding connecting plate A 272 and a sliding connecting plate B 273 for connecting the four groups of sliding seats 271;

[0045] A loading and moving assembly 28 is vertically inserted into the interval between the two sets of sliding connecting plates B273. The loading and moving assembly 28 includes two sets of magnetic loading columns 281. A central loading rod 282 is inserted into the middle position of the two sets of magnetic loading columns 281. The outer rings of the two sets of magnetic loading columns 281 are slidably sleeved with height adjustment parts 283. The staff can vertically adjust the height adjustment parts 283 sleeved on the outer rings of the magnetic loading columns 281 according to the weight of the concrete specimens being tested. When the size of the concrete test block for pressing is larger than the test block placed on the concrete test block placement platform 13 of the base, the height adjustment member 283 can be lifted upward to extend the length of the magnetic loading column 281 below it, so that the bottom of the central loading rod 282 can be in close contact with the upper surface of the concrete test block under test. Under the action of the gravity of the concrete test block above, the two groups of magnetic loading columns 281 will apply pressure to both sides along the upper end surface of the test block under test, and the bottom end surfaces of the two groups of magnetic loading columns 281 and the reciprocating friction component 291 will apply pressure symmetrically on both sides along the upper end surface of the test block, which can effectively ensure that the test block is pressed. During the test, the test block is evenly stressed to avoid structural damage or misjudgment caused by biased pressure, thus realizing the compression test of the concrete test block. During the test, axial pressure is applied to the test block to measure its axial compressive strength. This strength can more accurately reflect the bearing capacity of concrete in actual axially compressed components, and has direct reference value for the design and evaluation of compression components of concrete structures. The test block is allowed to produce a certain degree of bending deformation during the compression process, or by adjusting the placement and loading method of the test block, the flexural strength of the concrete can also be indirectly tested. Flexural strength reflects the ability of concrete to resist bending failure, and is of great significance for evaluating flexural components and crack resistance in concrete structures.

[0046] During the test, the test block is in an axially compressed state, which can more realistically reflect the stress condition of the structural components in the project and provide a reliable basis for the design and verification of concrete structures. By adjusting the loading method or the placement of the test block, the test block can be guided to produce a bending effect, thereby indirectly evaluating the flexural strength of the concrete, which is suitable for the analysis of curved components.

[0047] Example 3. When the size of the concrete test block used for pressing is smaller than or equal to the test block placed on the concrete test block placement platform 13 of the base, the height adjustment member 283 can be moved downward to the bottom position of the magnetic loading column 281, so that the magnetic loading column 281 and the center loading rod 282 can press the concrete test block downward at the same time for testing. No special fixture needs to be prepared, and test blocks of different specifications can be tested, which expands the scope of application of the equipment, can stably apply pressure to small test blocks, ensure uniform distribution of force, thereby obtaining more accurate strength data, and avoiding measurement errors or detection difficulties caused by small test block size. During the detection process, the cooperation between the magnetic loading column 281 and the center loading rod 282 can reduce the offset or tilt of the test block when under pressure, and improve the repeatability and reliability of the detection, which is especially important for small-sized test blocks because they are more susceptible to uneven force distribution.

[0048] The bottom of the magnetic loading column 281 is connected to the upper end surface of the bottom loading response mechanism 29. The bottom loading response mechanism 29 includes two sets of relatively arranged reciprocating friction components 291 and inclined contact edges 292 opened at the bottom positions of the two sets of reciprocating friction components 291. The upper end surface of one set of reciprocating friction components 291 is connected to the bottom of one side of the magnetic loading column 281, and the bottom positions of the two sets of reciprocating friction components 291 are set at a relative inclined angle.

[0049] In Example 4, the main supporting bracket 21 includes a bracket body 211 and a reversible support arm 212 installed on the upper end surface of the bracket body 211. The two sets of reversible support arms 212 arranged opposite to each other are hinged and connected in series via a hinge shaft 213. When the concrete test block is tested, the two sets of reversible support arms 212 arranged on both sides of the device can be flipped around the hinge shaft 213 below them as a rotation fulcrum, thereby rotating the originally vertically installed main supporting bracket 21 to a horizontal parallel placement state; after the flip is completed, the tested concrete test block can be placed in the storage structure arrangement and forming mechanism 22 for easy unified classification and management. At this time, the flipped main supporting bracket 21 structure can also be used to support the end of the inclined triangular limit component 134 of the upper structure, playing an auxiliary support role, enhancing the stability of the entire system and the convenience of subsequent operations.

[0050] The external frame mechanism 1 includes a side frame 11 and a limiting bracket 12 opened on both sides of the side frame 11. A horizontal connecting piece 14 is horizontally installed on the inner end surface of the limiting bracket 12. A concrete test block placement platform 13 is installed in the middle position of the bottom of the inner cavity of the side frame 11. The other end of the horizontal connecting piece 14 is attached to the upper end surface of the concrete test block placement platform 13. The concrete test block placement platform 13 is horizontally inserted through the interval of the test plate 24.

[0051] Example 5, the concrete specimen placement platform 13 includes a base body 131 and base limiting mechanisms 132 installed on both sides of the side end surface edges of the base body 131, and the other end of the base limiting mechanisms 132 is installed with a limiting bar 133, and an inclined triangular limiting component 134 is installed at the interval between the two groups of limiting bars 133.

[0052] The vertical loading mechanism 3 comprises a vertical slide rail 31 mounted vertically in the middle of the side end face of the side frame 11. The front end of the vertical slide rail 31 is vertically connected to two sets of vertical sliders 32. Upper and lower loading connectors 33 are positioned opposite each other, with an upper loading platform 34 defined at the other end. To further accurately measure the flexural strength and elastic modulus at the edge of the concrete specimen, the device incorporates a structured loading and friction response detection mechanism. This mechanism includes an external motor mounted in the middle of the upper loading platform 34, with its output facing downward. During operation, it generates a periodic impact force through a reciprocating drive.

[0053] The external motor impacts the upper loading platform 34, driving the upper structure's vertical loading mechanism 3 and its connected integral moving assembly, the loading moving assembly 28, downward to apply pressure. As the loading moving assembly 28 moves downward, the reciprocating friction component 291 of the structural member connected to its bottom begins to act on the edge of the concrete specimen.

[0054] In Example 6, the bottom of the reciprocating friction member 291 is equipped with an inclined contact edge 292. During movement, it creates oblique contact and friction with the edges of the concrete test block, generating force loading. Driven by an external motor, the reciprocating friction member 291 slides back and forth along the edges of the test block, subjecting the edge areas of the concrete test block to repeated loading.

[0055] This loading method simulates the complex stress state experienced by the specimen edge in an actual component, enabling testing of the concrete's edge flexural properties under local bending, shear, or combined forces. Furthermore, by measuring deformation during the stress process, the elastic modulus response of the concrete edge in that local area can be assessed, providing experimental data for high-precision structural analysis.

[0056] In Example 7, after the entire device is flipped 90 degrees, a lateral load can be applied to the concrete test block, which is closer to the stress form of beam and slab concrete components in actual structures under working conditions, thereby improving the engineering adaptability and representativeness of the test results.

[0057] The device can complete testing operations in both vertical and horizontal postures, and is compatible with axial compressive strength testing and flexural, shear or lateral pressure strength testing, greatly enhancing the applicability and testing capabilities of the equipment. In the horizontal state, the edge of the test block has more complete contact with the structures on both sides, which is helpful for implementing refined analysis projects such as edge compression performance testing, local stress concentration research and microcrack expansion monitoring.

[0058] After flipping, the test block can be more stably inserted into the lateral limit device. Especially for long or non-standard test blocks, the risk of lateral deviation or sliding can be significantly reduced, and the repeatability of the test and the accuracy of the results can be enhanced. The same set of structures can be adapted to force testing in different directions after flipping, avoiding the configuration of multiple independent devices for different testing conditions, saving space and cost, and improving the comprehensive utilization rate of the equipment.

[0059] In summary, the concrete test block that needs to be tested for strength is placed directly above the concrete test block placement platform 13. Since the upper portion of the inclined triangular limiting component 134 is set as a triangle, the concrete test block is placed on the inclined side. The overall movement of the vertical loading mechanism 3 drives the loading moving assembly 28 and the bottom loading response mechanism 29 to move in the same direction. A concrete test block for pressing is placed at the interval between the two sets of upper loading platforms 34. When the weight of the concrete test block presses down on the upper loading platform 34 and the upper and lower loading connecting members 33, the vertical slider 32 at the bottom moves downward along the vertical slide rail 31. While pressing downward, the vertical loading mechanism 3 can push the loading moving assembly 28 downward to move in the same direction, playing the role of self-positioning and stable support, effectively preventing the test block from sliding or offsetting during the testing process. The overall movement of the vertical loading mechanism 3 of the upper structure drives the loading moving assembly 28 of the lower connecting component and the bottom loading response mechanism 29 to move in the same direction in coordination, thereby realizing synchronous loading of multiple components, simplifying the operator's operating process, and improving loading efficiency and structural coordination.

[0060] The operator can vertically adjust the height adjustment member 283, which is sleeved on the outer ring of the magnetic loading column 281, based on the weight of the concrete test block being tested. When the concrete test block being pressed is larger than the test block placed on the concrete test block placement platform 13 of the base, the height adjustment member 283 can be lifted upward, thereby extending the length of the magnetic loading column 281 below it, so that the bottom of the central loading rod 282 can be closely attached to the upper surface of the concrete test block being tested. Under the influence of the gravity of the concrete test block above, the two sets of magnetic loading columns 281 will apply pressure to both sides along the upper end surface of the test block. The two sets of magnetic loading columns 281 and the bottom end surface of the reciprocating friction component 291 apply pressure symmetrically along the upper end surface of the test block. This effectively ensures that the test block is evenly stressed during the test process, avoiding structural damage or misjudgment caused by biased pressure, thereby achieving pressurization testing of the concrete test block.

[0061] During the test, axial compressive strength is measured by applying axial pressure to the test block. This strength can more accurately reflect the bearing capacity of concrete in actual axially compressed components and has direct reference value for the design and evaluation of compression components of concrete structures. By allowing the test block to undergo a certain degree of bending deformation during compression, or by adjusting the placement and loading method of the test block, the flexural strength of concrete can also be indirectly tested. Flexural strength reflects the ability of concrete to resist bending failure and is of great significance for evaluating flexural components and crack resistance in concrete structures.

[0062] During the test, the test block is in an axially compressed state, which can more realistically reflect the stress condition of the structural components in the project and provide a reliable basis for the design and verification of concrete structures. By adjusting the loading method or the placement of the test block, the test block can be guided to produce a bending effect, thereby indirectly evaluating the flexural strength of the concrete, which is suitable for the analysis of curved components.

[0063] When the size of the concrete test block used for pressing is smaller than or equal to the test block placed on the concrete test block placement platform 13 of the base, the height adjustment member 283 can be moved downward to the bottom position of the magnetic loading column 281, so that the magnetic loading column 281 and the center loading rod 282 can press the concrete test block downward at the same time for testing. No special fixtures need to be prepared, and test blocks of different specifications can be tested, which expands the scope of application of the equipment, can stably apply pressure to small test blocks, ensure uniform distribution of force, thereby obtaining more accurate strength data, and avoiding measurement errors or detection difficulties caused by small test block size. During the detection process, the cooperation between the magnetic loading column 281 and the center loading rod 282 can reduce the displacement or tilt of the test block when under pressure, and improve the repeatability and reliability of the detection, which is especially important for small-sized test blocks because they are more susceptible to uneven force distribution.

[0064] To further accurately measure the flexural strength and elastic modulus at the edges of concrete test blocks, this device incorporates a structured loading and friction response detection mechanism. This mechanism includes an external motor mounted in the middle of the upper loading platform 34. Its output terminal faces vertically downward, and during operation, it generates a periodic impact force through a reciprocating drive.

[0065] The external motor impacts the upper loading platform 34, driving the upper structure's vertical loading mechanism 3 and its connected integral moving assembly, the loading moving assembly 28, downward to apply pressure. As the loading moving assembly 28 moves downward, the reciprocating friction component 291 of the structural member connected to its bottom begins to act on the edge of the concrete specimen.

[0066] The bottom of the reciprocating friction member 291 is equipped with an inclined contact edge 292. During movement, it creates oblique contact and friction with the edges of the concrete block, creating a force load. Driven by an external motor, the reciprocating friction member 291 slides back and forth along the edges of the block, subjecting the edges of the concrete block to repeated loading.

[0067] This loading method simulates the complex stress state experienced by the specimen edge in an actual component, enabling testing of the concrete's edge flexural properties under local bending, shear, or combined forces. Furthermore, by measuring deformation during the stress process, the elastic modulus response of the concrete edge in that local area can be assessed, providing experimental data for high-precision structural analysis.

[0068] After the concrete test blocks have been tested, the two sets of reversible support arms 212 on either side of the device can be rotated around their lower hinge shafts 213 as pivot points, thereby rotating the originally vertically mounted main support bracket 21 to a horizontal, parallel position. After the reversal is complete, the tested concrete test blocks can be placed into the arranged and formed storage structure 22 for unified classification and management. At this time, the reversible main support bracket 21 structure can also be used to support the ends of the inclined triangular limiter 134 of the upper structure, providing auxiliary support, enhancing the stability of the entire system and the convenience of subsequent operation.

[0069] After flipping the entire device 90 degrees, a lateral load can be applied to the concrete test block, which is closer to the stress form of beam and slab concrete components in actual structures under working conditions, thereby improving the engineering adaptability and representativeness of the test results.

[0070] The device can complete testing operations in both vertical and horizontal postures, and is compatible with axial compressive strength testing and flexural, shear or lateral pressure strength testing, greatly enhancing the applicability and testing capabilities of the equipment. In the horizontal state, the edge of the test block has more complete contact with the structures on both sides, which is helpful for implementing refined analysis projects such as edge compression performance testing, local stress concentration research and microcrack expansion monitoring.

[0071] After flipping, the test block can be more stably inserted into the lateral limit device. Especially for long or non-standard test blocks, the risk of lateral deviation or sliding can be significantly reduced, and the repeatability of the test and the accuracy of the results can be enhanced. The same set of structures can be adapted to force testing in different directions after flipping, avoiding the configuration of multiple independent devices for different testing conditions, saving space and cost, and improving the comprehensive utilization rate of the equipment.

[0072] The above is the entire working principle of the present invention.

[0073] In the present invention, the installation method, connection method or setting method of all the components mentioned above are common mechanical methods, and the specific structures, models and coefficient indicators of all its components are its own technology. As long as it can achieve its beneficial effects, it can be implemented, so it will not be elaborated on.

[0074] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

[0075] In the present invention, unless otherwise specified, directional words contained in terms such as "up, down, left, right, front, back, inside, outside, and vertical, horizontal" only represent the orientation of the term in normal use, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, number series nouns such as "first", "second" and "third" do not represent specific quantities and orders, but are merely used to distinguish names. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

Claims

1. A concrete test block strength testing device, comprising an external frame mechanism (1), a support module (2) and a vertical loading mechanism (3), characterized in that: The inner cavity of the external frame mechanism (1) is provided with a support module (2), a vertical loading mechanism (3) is vertically arranged at the middle position of the support module (2), the support module (2) comprises a main load-bearing bracket (21) and an arrangement and forming mechanism (22) installed on the side end surface of the main load-bearing bracket (21), a support platform connecting plate (23) is extended and installed at the bottom edge position of the main load-bearing bracket (21), a load test plate (24) is arranged and vertically laid on the upper end surface of the support platform connecting plate (23), and the other end of the load test plate (24) is connected to the main load-bearing bracket (21) via a transverse connecting rod (25); The main bearing bracket (21) comprises a bracket body (211) and a reversible support arm (212) mounted on the upper end surface of the bracket body (211), two sets of oppositely arranged reversible support arms (212) are hinged, and the two sets of reversible support arms (212) are connected in series via a hinge shaft (213); The support module (2) further comprises a transverse connecting shaft (26) connected to the interval between two sets of transverse connecting rods (25) arranged opposite to each other in the transverse direction, the outer rings of the four sets of transverse connecting shafts (26) being slidably connected to a sliding outer ring assembly (27), the sliding outer ring assembly (27) comprising four sets of arranged sliding seats (271) and a sliding connecting plate A (272) and a sliding connecting plate B (273) for connecting the four sets of sliding seats (271); A loading and moving assembly (28) is vertically inserted between the two groups of sliding connecting plates B (273), and the loading and moving assembly (28) includes two groups of magnetic loading columns (281). A central loading rod (282) is inserted between the middle positions of the two groups of magnetic loading columns (281), and the outer rings of the two groups of magnetic loading columns (281) are slidably sleeved with height adjustment members (283). The bottom of the magnetic loading column (281) is connected to the upper end surface of the bottom loading response mechanism (29), and the bottom loading response mechanism (29) includes two sets of reciprocating friction components (291) arranged opposite to each other and an inclined contact edge (292) provided at the bottom of the two sets of reciprocating friction components (291); The external frame mechanism (1) includes a side frame (11) and a limiting bracket (12) provided on both sides of the side frame (11); a transverse connecting member (14) is transversely installed on the inner end surface of the limiting bracket (12); a concrete test block placement platform (13) is installed at the middle position of the bottom of the inner cavity of the side frame (11); the other end of the transverse connecting member (14) is attached to the upper end surface of the concrete test block placement platform (13); and the concrete test block placement platform (13) is transversely inserted through the interval of the test plate (24); The concrete test block placement platform (13) comprises a base body (131) and base side limiting mechanisms (132) installed on both sides of the edge of the side end surface of the base body (131), the other end of the base side limiting mechanisms (132) is installed with a limiting strip (133), and an inclined triangular limiting component (134) is installed at the interval between two groups of the limiting strips (133).

2. A concrete test block strength testing device according to claim 1, characterized in that: The upper end surface of one set of the reciprocating friction components (291) is connected to the bottom of the magnetic loading column (281) on one side, and the bottom positions of the two sets of the reciprocating friction components (291) are set at a relative tilt angle.

3. A concrete test block strength testing device according to claim 1, characterized in that: The vertical loading mechanism (3) comprises a vertical slide rail (31) vertically mounted at a middle position of a side end surface of the side frame (11); a front end surface of the vertical slide rail (31) vertically slides and connects two sets of vertical sliders (32); upper and lower loading connectors (33) are arranged opposite to each other in the two sets of vertical sliders (32); and an upper loading platform (34) is provided at the other end of the upper and lower loading connectors (33).

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