A test device for testing mechanical properties of self-compacting concrete

Abstract

The utility model belongs to concrete detection technical field especially relates to a kind of test device of testing self-compacting concrete mechanics performance, including bottom plate frame, and the roller mechanism is arranged in bottom plate frame outer end, and roller mechanism includes: roller wheel, and the roller wheel is located bottom plate frame centre line upper end, and roller wheel centre two sides are connected with shaft;Two connecting blocks, two pressure sensors, two down pressure cylinders, the shaft rotationally connected in connecting block in the roller wheel two sides, the pressure sensor is connected on connecting block upper end, and the down pressure cylinder drive end is connected on pressure sensor upper end. Roller mechanism adopts line contact dynamic rolling loading mode, compared with the static loading of traditional vertical cylinder pressure test, more in line with the dynamic change characteristics of load in actual engineering, can accurately simulate the stress condition of self-compacting concrete in actual engineering, so that simulation actual stress is more accurate, improve the accuracy and reliability of test result.

Description

Technical Field

[0001] This utility model belongs to the field of concrete testing technology, and in particular relates to a test device for testing the mechanical properties of self-compacting concrete. Background Technology

[0002] In the field of construction engineering, self-compacting concrete is widely used in various complex structures and difficult-to-vibrate parts, such as densely reinforced concrete structures and underground engineering, due to its excellent performance of filling formwork and wrapping steel bars without vibration. Accurately evaluating the mechanical properties of self-compacting concrete is crucial to ensuring the safety and durability of engineering structures.

[0003] However, traditional tests for the mechanical properties of self-compacting concrete often employ static loading methods such as vertical cylinder compression tests. While this method can reflect the compressive strength of concrete to some extent, it differs significantly from the stress state of self-compacting concrete in actual use scenarios. In real engineering projects, self-compacting concrete often bears dynamically changing loads. For example, in road and bridge engineering, concrete pavements are subjected to loads generated by rolling wheels, forming a composite stress field of "local compressive stress in the contact area + shear stress along the rolling direction." Traditional static loading methods cannot simulate this dynamically changing composite stress, making it difficult for test results to accurately reflect the mechanical properties of self-compacting concrete under real service conditions.

[0004] In view of this, we propose an experimental device for testing the mechanical properties of self-compacting concrete. Utility Model Content

[0005] The purpose of this invention is to provide a test device for testing the mechanical properties of self-compacting concrete, so as to solve the problems mentioned in the background art.

[0006] In view of this, the present invention provides a test device for testing the mechanical properties of self-compacting concrete, comprising a base frame, wherein a roller pressing mechanism is provided at the outer end of the base frame, and the roller pressing mechanism includes:

[0007] A roller is located at the upper end of the center line of the base plate frame, and rotating shafts are connected to both sides of the center of the roller;

[0008] Two connecting blocks, two pressure sensors, and two pressing cylinders are provided. The rotating shafts on both sides of the roller are rotatably connected inside the connecting blocks. The pressure sensors are connected to the upper end of the connecting blocks, and the driving end of the pressing cylinder is connected to the upper end of the pressure sensors.

[0009] A fixed frame and a movable block, wherein the fixed frame is connected to the upper ends of two pressing cylinders and the movable block is connected to the upper end of the fixed frame;

[0010] A lead screw and a drive motor are connected together, with the moving block threadedly connected to the outer end of the lead screw.

[0011] Two constraint blocks and two support rails are provided. The constraint blocks are connected to both sides of the fixed frame. The upper and lower ends of the constraint blocks are provided with auxiliary wheels, which are rotatably connected to the support rails.

[0012] In this technical solution, the roller is used to perform compressive strength testing on the concrete slab, the connecting block is used to support the roller so that it can rotate smoothly, the pressure sensor is used to detect the magnitude of the downward pressure, the downward pressure cylinder is used to provide downward pressure to the roller, and the drive motor is used to drive the lead screw to rotate. The rotation of the lead screw interacts with the moving block. Under the action of the constraint block and the support rail, the moving block can be moved, thereby driving the roller to roll. The constraint block moves within the support rail, which not only supports the roller but also prevents the reaction force generated by the downward pressure from acting on the lead screw, thus ensuring the smooth rotation of the lead screw.

[0013] In the above technical solution, the outer three side walls of the base plate frame are connected with frame edges, and the other side is an opening. The base plate frame is made of high-strength metal plate.

[0014] In this technical solution, the design of the three side walls and one side opening of the base plate frame facilitates the insertion of concrete samples into the base plate frame from the opening side. At the same time, the base plate frame, made of high-strength metal plate, can withstand the pressure generated during the rolling process, ensuring the structural stability of the device.

[0015] In the above technical solution, a baffle is inserted into the bottom plate frame, and the baffle and the outer edge of the bottom plate frame form a concrete sample plate placement groove, and handles are connected to both sides of the baffle.

[0016] In this technical solution, by holding the handles on both sides of the baffle, the baffle can be easily inserted into or removed from the base plate frame. When it is necessary to replace the concrete sample, simply remove the baffle to easily take out the tested sample, put in the new sample, and then insert the baffle to fix the sample.

[0017] In the above technical solution, a bearing is further provided between the connecting block and the roller shaft, and a hydraulic station is provided on the side of the bottom plate frame. The hydraulic station is connected to the lower cylinder through a high-pressure oil hose.

[0018] In this technical solution, the bearing can reduce the friction when the roller rotates, allowing the roller to rotate more smoothly and ensuring the stability and continuity of the rolling process. The hydraulic station provides hydraulic power to the lower cylinder through a high-pressure oil hose, which can precisely control the pressure output of the lower cylinder.

[0019] In the above technical solution, the roller pressing mechanism further includes: support legs on both sides, the lead screw is rotatably connected between the two support legs, two support rails are connected between the two support legs, the drive motor is connected to the upper end of the support legs, a reducer is connected to the side end of the support legs, the drive end of the drive motor is connected to the input end of the reducer, and the output end of the reducer is connected to the side end of the lead screw.

[0020] In this technical solution, the support leg frame provides a stable support structure for components such as the lead screw, support rail, and drive motor, ensuring the stability of the entire roller pressing mechanism. The reducer can adjust the speed and torque output by the drive motor, enabling the lead screw to rotate at a suitable speed and torque, thereby precisely controlling the moving speed and position of the roller pressing wheel.

[0021] In the above technical solution, a transparent protective cover is further provided in the gap between the base plate frame and the support leg frame. The transparent protective cover is made of high-strength transparent plastic or glass plate. The lower end of the transparent protective cover is connected to a movable base frame, and the movable base frame is provided with rollers and a push handle is connected to the side end.

[0022] In this technical solution, the transparent protective cover can effectively prevent concrete debris from splashing out during the test, protecting the safety of the operators. At the same time, because it is made of transparent material, the operators can clearly observe the changes in the concrete sample during the test. When it is necessary to operate or maintain the inside of the device, the bottom frame can be moved by pushing the handle, and the transparent protective cover can be moved to a suitable position by using the rollers, which is convenient for operation.

[0023] In the above technical solution, the upper end of the pressure sensor is connected to a protective sleeve, which is sleeved on the outer end of the lower cylinder. The side end of the support leg is connected to a control panel, which is equipped with a display screen and control buttons.

[0024] In this technical solution, the protective sleeve can prevent the flying particles generated when the concrete slab breaks from damaging the drive shaft of the pressure cylinder. The display screen on the control panel displays parameters such as the pressure value measured by the pressure sensor in real time. The operator can intuitively understand the pressure changes during the test. Through the control buttons, the operator can easily control the start and stop of the drive motor, its speed, and the pressure provided by the hydraulic station to the pressure cylinder, so as to achieve precise control of the entire test process. For example, during the test, the operator can adjust the pressure of the pressure cylinder in time according to the pressure value displayed on the screen, so that the test is more in line with the actual needs.

[0025] The beneficial effects of this utility model are:

[0026] 1. This test apparatus for testing the mechanical properties of self-compacting concrete features a roller pressing mechanism. The rollers press the concrete sample slab, creating a composite stress field of "local compressive stress in the contact area + shear stress along the rolling direction" through dynamic rolling loading via line contact. This more closely resembles the stress state of self-compacting concrete in actual use scenarios (such as the rolling load of wheels on the road surface). Compared to the static loading of traditional vertical cylinder pressing tests, the line contact dynamic rolling loading method of the roller pressing mechanism better reflects the dynamic changes in loads in actual engineering projects. It can accurately simulate the stress conditions of self-compacting concrete in actual engineering, making the simulation of actual stress more precise and improving the accuracy and reliability of the test results.

[0027] 2. The test apparatus for testing the mechanical properties of self-compacting concrete is equipped with a transparent protective cover, which can prevent concrete debris from splashing and protect the safety of the operator, while not affecting the observation of the test process. After the experiment is completed, the transparent protective cover can be removed by moving the bottom frame. This not only makes it convenient for the operator to observe the state of the concrete slab at a static distance, but also makes it easy to clean the concrete slab from the bottom frame. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the transparent protective cover structure in this utility model;

[0030] Figure 3 This is a schematic diagram of the lead screw structure in this utility model;

[0031] Figure 4 This is a schematic diagram of the roller pressing wheel structure in this utility model;

[0032] Figure 5 This is a schematic diagram of the cross-sectional structure of the lower cylinder in this utility model;

[0033] Figure 6 This is a schematic diagram of the side end of the roller in this utility model.

[0034] The markings in the diagram are as follows:

[0035] 1. Base frame; 2. Roller roller; 3. Connecting block; 4. Pressure sensor; 5. Downward cylinder; 6. Fixed frame; 7. Moving block; 8. Lead screw; 9. Drive motor; 10. Constraint block; 11. Support rail; 12. Baffle; 13. Hydraulic station; 14. Support leg frame; 15. Transparent protective cover; 16. Moving base frame; 17. Protective sleeve. Detailed Implementation

[0036] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0037] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0038] Example 1: This example provides a test device for testing the mechanical properties of self-compacting concrete, including a base frame 1, and a roller pressing mechanism is provided at the outer end of the base frame 1. The roller pressing mechanism includes:

[0039] Roller 2 is located at the upper end of the center line of the base plate frame 1, and rotating shafts are connected to both sides of the center of roller 2.

[0040] Two connecting blocks 3, two pressure sensors 4, two pressing cylinders 5, the rotating shafts on both sides of the roller 2 are rotatably connected inside the connecting blocks 3, the pressure sensors 4 are connected to the upper end of the connecting blocks 3, and the driving end of the pressing cylinders 5 is connected to the upper end of the pressure sensors 4.

[0041] Fixed frame 6 and movable block 7 are connected to the upper ends of the two pressing cylinders 5 and the movable block 7 is connected to the upper end of the fixed frame 6.

[0042] Lead screw 8, drive motor 9, and moving block 7 are threadedly connected to the outer end of lead screw 8;

[0043] Two constraint blocks 10 and two support rails 11 are provided. The constraint blocks 10 are connected to both sides of the fixed frame 6. The upper and lower ends of the constraint blocks 10 are provided with auxiliary wheels, which are tactilely connected to the support rails 11.

[0044] The drive motor 9 drives the lead screw 8 to rotate via a reducer. The rotation of the lead screw 8 causes the threaded moving block 7 to move laterally along the lead screw 8, thereby driving the fixed frame 6, the lower pressure cylinder 5, the connecting block 3, and the roller 2 to move laterally. The lower pressure cylinder 5 extends and provides downward pressure to the roller 2 through the pressure sensor 4. The roller 2 moves above the base frame 1 and applies pressure to the concrete sample below, simulating the actual stress situation. The pressure sensor 4 monitors the pressure magnitude in real time. Advantages: It can simulate the moving pressure on concrete in actual engineering, and the pressure data can be accurately obtained through the pressure sensor 4, improving the accuracy and comprehensiveness of the test, and providing a reliable basis for the mechanical property analysis of self-compacting concrete.

[0045] Example 2: This example provides a test device for testing the mechanical properties of self-compacting concrete. In addition to the technical solutions of the above examples, it also has the following technical features: the three side walls of the outer end of the base frame 1 are connected with frame edges, and the other side is an opening. The base frame 1 is made of a high-strength metal plate.

[0046] The high-strength metal plate ensures the structural stability of the base frame 1, enabling it to withstand the pressure applied by the rollers 2 and the weight of the concrete sample. The design of three side walls and one side opening facilitates the placement and removal of the concrete sample plate, while also providing some restraint for the sample. Advantages include: ensuring the stability of the base frame 1 during testing, guaranteeing smooth testing, facilitating the loading and unloading of concrete samples, and improving testing efficiency.

[0047] Example 3: This example provides a test device for testing the mechanical properties of self-compacting concrete. In addition to the technical solutions of the above examples, it also has the following technical features: a baffle 12 is inserted into the bottom frame 1, and the baffle 12 and the outer edge of the bottom frame 1 form a concrete sample plate placement groove. Handles are connected to both sides of the baffle 12.

[0048] The concrete sample plate is placed in the placement groove formed by the baffle 12 and the frame edge. The baffle 12 can be easily inserted and removed by the handle, so as to replace different concrete samples. Advantages: It is convenient to replace concrete samples, improves the flexibility of testing, and adapts to the testing needs of different types of self-compacting concrete samples.

[0049] Example 4: This example provides a test device for testing the mechanical properties of self-compacting concrete. In addition to the technical solutions of the above examples, it also has the following technical features: a bearing is provided between the connecting block 3 and the roller 2 shaft, a hydraulic station 13 is provided on the side of the bottom frame 1, and the hydraulic station 13 is connected to the lower cylinder 5 through a high-pressure oil hose.

[0050] Among them, the bearing ensures that the roller 2 rotates flexibly, reducing friction and wear during rotation. The hydraulic station 13 provides stable hydraulic power to the lower cylinder 5 through the high-pressure oil hose, enabling the lower cylinder 5 to stably provide the required pressure to the roller 2. Advantages: It extends the service life of the roller 2 and related components, ensures the stability of the pressure output of the lower cylinder 5, and thus improves the accuracy of the test results.

[0051] Example 5: This example provides a test device for testing the mechanical properties of self-compacting concrete. In addition to the technical solutions of the above examples, it also has the following technical features: the roller pressing mechanism further includes: two support legs 14 on both sides, a lead screw 8 rotatably connected between the two support legs 14, two support rails 11 connected between the two support legs 14, a drive motor 9 connected to the upper end of the support legs 14, a reducer connected to the side end of the support legs 14, the drive end of the drive motor 9 connected to the input end of the reducer, and the output end of the reducer connected to the side end of the lead screw 8.

[0052] Among them, the support leg frame 14 provides stable support for the lead screw 8, the drive motor 9 and the entire rolling mechanism. The drive motor 9 transmits power to the lead screw 8 through the reducer, realizing the rotation of the lead screw 8, thereby driving the moving block 7 and related components to move. Advantages: It ensures the stability of the rolling mechanism, makes the rolling process run smoothly, and improves the reliability of the test.

[0053] Example 6: This example provides a test device for testing the mechanical properties of self-compacting concrete. In addition to the technical solutions of the above examples, it also has the following technical features: a transparent protective cover 15 is provided in the gap between the base frame 1 and the support leg frame 14. The transparent protective cover 15 is made of high-strength transparent plastic or glass plate. A movable base frame 16 is connected to the lower end of the transparent protective cover 15. Rollers are provided in the movable base frame 16, and a push handle is connected to the side end.

[0054] The transparent protective cover 15 blocks concrete debris from splashing, protecting the safety of operators and facilitating observation of the testing process. The rollers and push handles of the movable base frame 16 make it easy to move the transparent protective cover 15 and clean up the concrete residue inside. Advantages: It effectively ensures the safety of operators, facilitates the cleaning of residue generated during the testing process, maintains the cleanliness of the testing environment, and ensures the normal operation of the testing device.

[0055] Example 7: This example provides a test device for testing the mechanical properties of self-compacting concrete. In addition to the technical solutions of the above examples, it also has the following technical features: the upper end of the pressure sensor 4 is connected to a protective sleeve 17, the protective sleeve 17 is sleeved on the outer end of the lower cylinder 5, and the side end of the support leg frame 14 is connected to a control panel, which is equipped with a display screen and control buttons.

[0056] The protective sleeve 17 protects the connection between the pressure sensor 4 and the lower cylinder 5 from damage caused by concrete residue. The operator controls the drive motor 9, lower cylinder 5, and other components through the control buttons on the control panel. The display screen shows the pressure data collected by the pressure sensor 4 in real time. Advantages: It extends the service life of the pressure sensor 4 and the lower cylinder 5, makes it convenient for the operator to adjust the test parameters according to the test requirements, obtain pressure data in real time, and improve the accuracy and convenience of the test.

[0057] Working principle: First, take the baffle 12 out of the base frame 1 by the handle, put the prepared self-compacting concrete sample plate into the base frame 1, and then insert the baffle 12 so that the baffle 12 and the outer edge of the base frame 1 fix the concrete sample plate.

[0058] Then, the hydraulic station 13 is started. The hydraulic station 13 provides hydraulic power to the lower cylinder 5 through the high-pressure oil hose. The drive end of the lower cylinder 5 moves downward. Through the pressure sensor 4, it drives the connecting block 3 and the roller 2 to apply pressure to the concrete sample plate. At the same time, the drive motor 9 is started. The power of the drive motor 9 is transmitted to the lead screw 8 after being adjusted by the reducer. The lead screw 8 rotates and drives the moving block 7 to move along the direction of the lead screw 8. In turn, it drives the fixed frame 6, the lower cylinder 5, the connecting block 3 and the roller 2 to move together, so as to achieve roller pressing on different positions of the concrete sample plate.

[0059] During the rolling process, the pressure sensor 4 monitors the pressure in real time and transmits the pressure data to the display screen of the control panel. The operator can adjust the speed of the drive motor 9 to change the moving speed of the rolling roller 2 and adjust the pressure provided by the hydraulic station 13 to the lower cylinder 5 according to the actual test requirements through the control buttons on the control panel.

[0060] The transparent protective cover 15 can prevent concrete debris from flying and injuring people, and the operator can observe the test process through the transparent protective cover 15;

[0061] After the test is completed, turn off the drive motor 9 and the hydraulic station 13, remove the baffle 12 by the handle, and move the transparent protective cover 15 out through the movable bottom frame 16. At this time, it is not only convenient for the operator to observe the state of the concrete slab at a static distance, but also convenient to remove the concrete slab from the bottom frame 1.

[0062] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A test apparatus for testing the mechanical properties of self-compacting concrete, comprising a base frame (1), characterized in that: A roller pressing mechanism is provided at the outer end of the base plate frame (1), and the roller pressing mechanism includes: Roller (2), the roller (2) is located at the upper end of the center line of the base plate frame (1), and the roller (2) is connected to the two sides of the center; Two connecting blocks (3), two pressure sensors (4), two pressing cylinders (5), the rotating shafts on both sides of the roller (2) are rotatably connected inside the connecting block (3), the pressure sensor (4) is connected to the upper end of the connecting block (3), and the driving end of the pressing cylinder (5) is connected to the upper end of the pressure sensor (4); A fixed frame (6) and a movable block (7) are provided. The fixed frame (6) is connected to the upper end of two pressing cylinders (5), and the movable block (7) is connected to the upper end of the fixed frame (6). The lead screw (8) and drive motor (9) are connected to the outer end of the lead screw (8); the moving block (7) is threadedly connected to the outer end of the lead screw (8); Two constraint blocks (10) and two support rails (11) are provided. The constraint blocks (10) are connected to both sides of the fixed frame (6). The upper and lower ends of the constraint blocks (10) are provided with auxiliary wheels, which are tumblingly connected to the support rails (11).

2. The test apparatus for testing the mechanical properties of self-compacting concrete according to claim 1, characterized in that, The bottom plate frame (1) has three side walls connected to the frame edge, and the other side is an opening. The bottom plate frame (1) is made of high-strength metal plate.

3. The test apparatus for testing the mechanical properties of self-compacting concrete according to claim 1, characterized in that, A baffle (12) is inserted into the base plate frame (1). The baffle (12) and the outer edge of the base plate frame (1) form a concrete sample plate placement groove. Handles are connected to both sides of the baffle (12).

4. The test apparatus for testing the mechanical properties of self-compacting concrete according to claim 1, characterized in that, A bearing is provided between the connecting block (3) and the roller (2) shaft, and a hydraulic station (13) is provided on the side of the base plate frame (1). The hydraulic station (13) is connected to the lower cylinder (5) through a high-pressure oil hose.

5. The test apparatus for testing the mechanical properties of self-compacting concrete according to claim 1, characterized in that, The rolling mechanism also includes: two support legs (14) on both sides, the lead screw (8) is rotatably connected between the two support legs (14), two support rails (11) are connected between the two support legs (14), the drive motor (9) is connected to the upper end of the support legs (14), the side end of the support legs (14) is connected to a reducer, the drive end of the drive motor (9) is connected to the input end of the reducer, and the output end of the reducer is connected to the side end of the lead screw (8).

6. The test apparatus for testing the mechanical properties of self-compacting concrete according to claim 5, characterized in that, A transparent protective cover (15) is provided in the gap between the base frame (1) and the support leg frame (14). The transparent protective cover (15) is made of high-strength transparent plastic or glass plate. A movable base frame (16) is connected to the lower end of the transparent protective cover (15). A roller is provided in the movable base frame (16), and a push handle is connected to the side end.

7. The test apparatus for testing the mechanical properties of self-compacting concrete according to claim 5, characterized in that, The pressure sensor (4) is connected to a protective sleeve (17) at its upper end. The protective sleeve (17) is sleeved on the outer end of the lower cylinder (5). The support leg frame (14) is connected to a control panel at its side end. The control panel is equipped with a display screen and control buttons.

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