A device for testing the block compression resistance of a concrete flexural tensile specimen

Abstract

The utility model provides a kind of concrete bending tensile test piece broken block compression test device, it solves and concrete fixed problems, it includes test frame body, test frame body built-in test cavity, test frame body upper end is equipped with hydraulic assembly, and hydraulic assembly telescopic end is downward and extends into test cavity, and the output end of hydraulic assembly is connected with force transmission plate by adjusting component, and test cavity inside is provided with fixed clamp and sensing element.The utility model has the advantages of good structural stability, high safety and the like.

Description

Technical Field

[0001] This utility model belongs to the field of concrete testing technology, specifically relating to a concrete bending tensile specimen fracture block compressive strength test device. Background Technology

[0002] The existing mechanical properties of concrete directly affect the safety and durability of structures. Therefore, accurate testing of concrete strength is a core aspect of engineering quality control. Strength testing is mainly divided into two categories: compressive strength, which measures the concrete's ability to withstand compressive loads and is the most important indicator for evaluating concrete grade; and flexural strength, which measures the concrete's ability to resist bending failure and is crucial for structures that primarily bear flexural stress, such as pavements, bridge decks, and airport runways. However, in actual testing, existing compressive strength testing equipment does not provide adequate fixation to the concrete, leading to significant deviations in actual test results.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a fully automatic concrete flexural and compressive strength testing device [202510394219.2], which includes a frame, a support rod mounted on the frame, a top plate mounted on the top of the support rod, and a flexural strength testing mechanism and a compressive strength testing mechanism mounted on the frame. The flexural strength testing mechanism includes a first hydraulic cylinder fixedly mounted on the top plate and a base fixedly mounted on the frame. The base is U-shaped, with sliding grooves on both sides. A front slider and a rear slider are slidably mounted in the sliding grooves. An upper rack is connected to the lower end of the front slider, and a lower rack is connected to the lower end of the rear slider. The upper and lower racks are parallel to each other. A rotating shaft is rotatably mounted in the sliding groove, and a spur gear is fixedly mounted on the rotating shaft. The spur gear meshes with both the upper and lower racks. A driven gear is fixedly mounted on a section of the rotating shaft that passes through the base.

[0004] The above solution has solved the problem of concrete testing safety to some extent, but it still has many shortcomings, such as poor fixation effect with concrete. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed and effective concrete bending tensile specimen block compressive strength testing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a concrete bending tensile specimen fracture compression test device, comprising a test frame, a test cavity built into the test frame, a hydraulic component installed at the upper end of the test frame, the telescopic end of the hydraulic component facing downward and extending into the test cavity, the output end of the hydraulic component being connected to a force transmission plate through a directional component, and a fixing clamp and a sensing element being provided inside the test cavity.

[0007] In the above-mentioned concrete bending tensile specimen fracture compression test device, the test frame includes a base, the upper end of the base is connected to a top plate through a support column, the upper end of the top plate is equipped with a support frame, the hydraulic component is fixed on the support frame, and the top plate has an opening for the output end of the hydraulic component to pass through.

[0008] In the above-mentioned concrete bending tensile specimen fracture compression test device, the hydraulic component includes a hydraulic cylinder, the output end of which is connected to a limit platform, and the limit platform is slidably connected to the support column.

[0009] In the above-mentioned concrete bending tensile specimen fracture compression test device, the directional component includes a directional seat set at the output end of the hydraulic cylinder, a ball seat is movably installed on the directional seat through a ball socket, the ball seat is fixedly connected to the force transmission plate, and a locking component is provided between the ball socket and the ball seat.

[0010] In the above-mentioned concrete bending tensile specimen fracture compression test device, the locking component includes a locking rod that is slidably telescopically installed in the ball socket and whose central axis coincides with the central axis of the hydraulic cylinder output end. The locking rod is connected to a hydraulic push rod, and a locking plate that fits and presses against the ball seat is fixed at the end of the locking rod. The locking plate is covered with an anti-slip layer.

[0011] In the above-mentioned concrete bending tensile specimen fracture compression test device, the fixing fixture includes a fixing plate, the fixing plate has fixing holes arranged in the circumferential direction, and a pressure plate is fixed in the fixing holes by threaded parts. The pressure plate is L-shaped and has an adjustment groove for the threaded parts to pass through.

[0012] In the above-mentioned concrete bending tensile specimen fracture compression test device, pressure sensors are respectively installed on the pressure plate and pressure sensors are installed inside the fixing plate.

[0013] In the above-mentioned concrete bending tensile specimen fracture compression test device, the opening around the test chamber is closed by a transparent cover plate, and a transparent door panel is hinged to the front of the test chamber.

[0014] In the above-mentioned concrete bending tensile specimen fracture compression test device, the test frame is made of stainless steel square tube structure.

[0015] In the above-mentioned concrete bending tensile specimen fracture compression test device, the lower end of the test frame is fixed on a cement base.

[0016] Compared with existing technologies, the advantages of this utility model are as follows: the directional adjustment component adopts a ball joint structure, which, together with the locking component, fixes the orientation of the force transmission plate, thereby ensuring the fixing effect with the concrete; the fixing clamp provides multiple support points for the concrete block, ensuring the stability of the force direction without affecting the pressure deformation; the cover plate and door plate protect the test chamber, thereby improving the safety of the test operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is another structural schematic diagram of the present invention; Figure 3 This is a partial schematic diagram of the present invention; Figure 4 This is a partial sectional view of the present invention; In the figure, the components are: test frame 1, base 11, support column 12, top plate 13, support frame 14, test chamber 2, transparent cover plate 21, transparent door panel 22, hydraulic assembly 3, hydraulic cylinder 31, limit platform 32, adjustment assembly 4, adjustment seat 41, ball socket 42, ball seat 43, locking rod 44, hydraulic push rod 45, locking plate 46, force transmission plate 5, fixing plate 51, fixing hole 52, pressure plate 53, adjustment groove 54, fixing fixture 6, and cement base platform 7. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-4 As shown, a concrete flexural tensile specimen fracture block compressive strength testing device includes a test frame 1, which serves as the core load-bearing frame of the entire device, supporting key components such as the hydraulic assembly 3 and the fixing clamp 6, ensuring structural stability during the test. The test frame 1 houses a test chamber 2, providing an independent testing space for the concrete flexural tensile specimen fracture block, effectively isolating it from external environmental interference, and reserving an operating window for test observation and data acquisition. The hydraulic assembly 3 is installed at the upper end of the test frame 1, serving as the power core of the testing device, used to output stable and controllable axial compressive loads. Its load range must match the design compressive strength requirements of the concrete flexural tensile specimen fracture block. The telescopic end of the hydraulic assembly 3 faces downwards and extends into the test chamber 2. The extension direction is aligned with the vertical center axis of the test chamber 2 to ensure that the load acts perpendicularly on the specimen block, reducing test errors caused by load offset. The output end of the hydraulic component 3 is connected to the force transmission plate 5 through the directional component 4. The directional component 4 is used to adjust the angle of the force transmission plate 5 to accommodate possible surface unevenness of the specimen block, ensuring that the force transmission plate 5 is in full contact and fixed with the force-bearing surface of the specimen. As a load transfer carrier, the force transmission plate 5 must be made of high-strength alloy material to avoid its own deformation affecting the load transfer accuracy. The test chamber 2 is equipped with a fixing clamp 6 and a sensing element. The fixing clamp 6 is used to position and fix the specimen block to prevent displacement or tilting of the specimen during test loading. The sensing element is used to collect key data such as load and deformation in real time to provide a basis for test result analysis.

[0020] Specifically, the test frame 1 includes a base 11, which provides bottom support for the test frame 1 and needs to have sufficient weight and contact area to lower the center of gravity of the device and prevent overturning. The upper end of the base 11 is connected to a top plate 13 through a support column 12. The support column 12 is the main load-bearing member and its cross-sectional dimensions need to be determined through mechanical calculations to ensure that it can withstand the vertical load transmitted by the hydraulic component 3. The top plate 13 is used to support the hydraulic component 3 and the support frame 14 to prevent local deformation due to stress. The support frame 14 is installed on the upper end of the top plate 13. The support frame 14 provides a dedicated fixing platform for the hydraulic component 3. Its structure needs to match the installation dimensions of the hydraulic component 3 to ensure that the hydraulic component 3 is not loose or displaced. The hydraulic component 3 is fixed on the support frame 14. The top plate 13 has an opening for the output end of the hydraulic component 3 to pass through. The diameter of the opening needs to be slightly larger than the cross-sectional dimensions of the output end of the hydraulic component 3 to ensure smooth extension and retraction of the output end while avoiding excessive gaps that would cause the output end to shake.

[0021] Specifically, the hydraulic assembly 3 includes a hydraulic cylinder 31, which is the power output element of the hydraulic assembly 3. The piston rod is driven to extend and retract by hydraulic oil, and its rated pressure must meet the maximum compressive load requirement of the concrete bending tensile specimen. The output end of the hydraulic cylinder 31 is connected to a limiting platform 32, which is used to limit the maximum extension and retraction stroke of the hydraulic cylinder 31 to prevent overloading from damaging the specimen or device. The limiting platform 32 is slidably connected to the support column 12. The sliding connection structure can vertically guide the output end of the hydraulic cylinder 31 to avoid lateral deviation of the output end and further ensure the load transfer accuracy.

[0022] Furthermore, the directional assembly 4 includes a directional seat 41 disposed at the output end of the hydraulic cylinder 31. The directional seat 41 serves as the fixed base for the directional assembly 4 and is rigidly connected to the output end of the hydraulic cylinder 31 to ensure stable power transmission. A ball seat 43 is movably mounted on the directional seat 41 via a ball socket 42. The ball socket 42 and the ball seat 43 form a ball joint structure, which can realize multi-directional angle adjustment within a fixed range and flexibly adapt to the uneven surface of the specimen fragment. The ball seat 43 is fixedly connected to the force transmission plate 5 by welding or high-strength bolts to ensure no relative displacement and to ensure the stability of the force transmission plate 5 after angle adjustment. A locking assembly is provided between the ball socket 42 and the ball seat 43. The locking assembly is used to fix the relative position of the ball socket 42 and the ball seat 43 after angle adjustment to prevent angle changes during test loading.

[0023] Furthermore, the locking assembly includes a locking rod 44 that is slidably telescopically installed within the ball joint 42, with its central axis coinciding with the central axis of the output end of the hydraulic cylinder 31. The central axis of the locking rod 44 coincides with the output axis of the hydraulic cylinder 31, ensuring that the locking force acts vertically and avoiding additional lateral force on the ball joint structure. The locking rod 44 is connected to a hydraulic push rod 45, which provides telescopic power to the locking rod 44. Its control is linked with the hydraulic cylinder 31 to achieve automated operation of adjusting the direction before locking, reducing manual intervention. A locking plate 46 is fixed at the end of the locking rod 44 and pressed tightly against the ball seat 43. The locking plate 46 can increase the contact area between the locking rod 44 and the ball seat 43, avoiding damage to the ball seat 43 due to excessive local pressure. The locking plate 46 is covered with an anti-slip layer made of rubber or polyurethane, which can increase the friction between the locking plate 46 and the ball seat 43, improve locking stability, and prevent slippage during testing.

[0024] In addition, the fixing fixture 6 includes a fixing plate 51, which is the basic load-bearing component of the fixing fixture 6. It is used to place the specimen fragment and provide a flat support surface for the specimen. The fixing plate 51 has fixing holes 52 arranged in the circumferential direction. The fixing holes 52 can fix the pressure plate 53 from multiple directions to avoid local stress concentration. The pressure plate 53 is fixed in the fixing holes 52 by threaded parts. The threaded parts are made of high-strength bolts, and their tightening torque is adjustable to ensure that the specimen is fixed without damaging it. The pressure plate 53 is L-shaped and has an adjustment groove 54 for the threaded parts to pass through. The L-shaped structure can fit the top and side surfaces of the specimen at the same time, making the fixation more stable. The adjustment groove 54 provides lateral adjustment space for the threaded parts to adapt to specimens of different sizes and improve the versatility of the fixture.

[0025] Meanwhile, pressure sensors are installed on the pressure plate 53. The pressure sensors on the pressure plate 53 can monitor the fixed pressure in real time to prevent the specimen from being damaged by excessive pressure or slipping due to insufficient pressure. A pressure sensor is installed in the fixing plate 51. The pressure sensor in the fixing plate 51 can collect the bottom support reaction force of the specimen and compare it with the output pressure of the hydraulic component 3 to achieve data cross-calibration and improve the accuracy of the test data.

[0026] As can be seen, the opening 15 around the test chamber 2 is sealed by a transparent cover plate 21. The transparent cover plate 21 is made of high-strength tempered glass, which can seal the test chamber 2 to prevent specimen fragments from flying, and at the same time facilitate the observation of the test process. A transparent door plate 22 is hinged to the front of the test chamber 2. The hinged transparent door plate 22 can be opened and closed flexibly to facilitate the clamping and removal of the specimen.

[0027] It is evident that the test frame 1 is made of stainless steel square tube structure. Stainless steel square tube has excellent corrosion resistance, which can prevent moisture and curing liquid in the test environment from corroding the frame. At the same time, the bending and torsional stiffness of square tube is better than that of round tube, which can withstand greater loads under the same cross-sectional size, and is easy to connect with other components.

[0028] Preferably, the lower end of the test frame 1 is fixed on the cement base 7. The cement base 7 has high rigidity and stability, which can absorb test vibration and reduce the interference of vibration on the sensing elements. At the same time, its large weight can further lower the center of gravity of the device, improve the anti-overturning ability, and ensure the safety and stability of the test.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0030] Although this paper frequently uses terms such as test frame 1, base 11, support column 12, top plate 13, support frame 14, test chamber 2, transparent cover 21, transparent door panel 22, hydraulic assembly 3, hydraulic cylinder 31, limiting platform 32, adjusting assembly 4, adjusting seat 41, ball socket 42, ball seat 43, locking rod 44, hydraulic push rod 45, locking plate 46, force transmission plate 5, fixing plate 51, fixing hole 52, pressure plate 53, adjusting groove 54, fixing clamp 6, and cement base 7, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A test device for the compressive strength of concrete flexural tensile specimens, comprising a test frame (1), wherein the test frame (1) has a built-in test cavity (2), and a hydraulic assembly (3) is installed at the upper end of the test frame (1), characterized in that, The hydraulic component (3) has its telescopic end facing downward and extending into the test chamber (2). The output end of the hydraulic component (3) is connected to a force transmission plate (5) via a directional component (4). The test chamber (2) is equipped with a fixing clamp (6) and a sensing element.

2. The concrete bending tensile specimen segment compressive strength test device according to claim 1, characterized in that, The test frame (1) includes a base (11), the upper end of which is connected to a top plate (13) via a support column (12), a support frame (14) is installed on the upper end of the top plate (13), the hydraulic component (3) is fixed on the support frame (14), and the top plate (13) has an opening for the output end of the hydraulic component (3) to pass through.

3. The concrete bending tensile specimen segment compressive strength test device according to claim 2, characterized in that, The hydraulic component (3) includes a hydraulic cylinder (31), the output end of which is connected to a limiting platform (32), and the limiting platform (32) is slidably connected to the support column (12).

4. The concrete bending tensile specimen segment compressive strength test device according to claim 3, characterized in that, The steering assembly (4) includes a steering seat (41) disposed at the output end of the hydraulic cylinder (31). The steering seat (41) is movably mounted with a ball seat (43) through a ball socket (42). The ball seat (43) is fixedly connected to the force transmission plate (5). A locking assembly is provided between the ball socket (42) and the ball seat (43).

5. The concrete bending tensile specimen segment compressive strength test device according to claim 4, characterized in that, The locking assembly includes a locking rod (44) that is slidably telescopically installed in the ball socket (42) and whose central axis coincides with the central axis of the output end of the hydraulic cylinder (31). The locking rod (44) is connected to a hydraulic push rod (45). A locking plate (46) that fits and presses against the ball seat (43) is fixed at the end of the locking rod (44). The locking plate (46) is covered with an anti-slip layer.

6. The concrete bending tensile specimen segment compressive strength test device according to claim 1, characterized in that, The fixing clamp (6) includes a fixing plate (51), the fixing plate (51) has fixing holes (52) arranged in the circumferential direction, and a pressure plate (53) is fixed in the fixing holes (52) by a threaded component. The pressure plate (53) is L-shaped and has an adjustment groove (54) for the threaded component to pass through.

7. The concrete bending tensile specimen segment compressive strength test device according to claim 6, characterized in that, Pressure sensors are respectively provided on the pressure plate (53) and pressure sensors are provided inside the fixing plate (51).

8. The concrete bending tensile specimen segment compressive strength test device according to claim 1, characterized in that, The test chamber (2) is closed by a transparent cover plate (21) around the opening (15), and a transparent door plate (22) is hinged to the front side of the test chamber (2).

9. The concrete bending tensile specimen segment compressive strength test device according to claim 1, characterized in that, The test frame (1) is made of stainless steel square tube.

10. The concrete bending tensile specimen segment compressive strength test device according to claim 1, characterized in that, The lower end of the test frame (1) is fixed on the cement base (7).

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