Road construction concrete strength detection device
By combining the guide frame and the electromagnetic induction probe, the problems of manual operation error and the influence of steel bars in traditional concrete strength testing equipment are solved, and high-precision, low-wear automated testing is achieved.
Patent Information
- Application Number
- CN202521397542.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-04
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-07-04
AI Technical Summary
Traditional concrete strength testing equipment relies on manual operation, which makes it difficult to maintain a perpendicular impact angle and is easily affected by reinforcing bars, resulting in low testing accuracy and easy equipment wear and tear.
A guide frame is used to ensure the vertical movement of the impact rod, an electromagnetic induction probe is used to identify the position of the rebar, and a buffer system and motor-driven rack and pinion transmission are combined to achieve automated detection.
It improves the accuracy and repeatability of test data, avoids false detections in the rebar area, reduces equipment wear, extends service life, and improves testing efficiency.
Smart Images
Figure CN224681928U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of road construction technology, and in particular to a device for testing the strength of concrete in road construction. Background Technology
[0002] The strength of concrete in road construction refers to its ability to resist failure under external forces during road construction, typically characterized by compressive strength. Compressive strength is the maximum pressure a concrete specimen can withstand before failure under specified loading conditions. The strength of concrete depends on various factors, including the quality of raw materials, water-cement ratio, aggregate type, and construction techniques. In road construction, the selection of concrete strength grade is crucial. Different parts of the project require different strength grades of concrete. For example, areas subjected to high pressure require high-strength concrete, such as C30 or C35, while areas subjected to low pressure should use lower-strength concrete, such as C20 or C25. Furthermore, different parts of the project have different performance requirements for concrete, such as good fluidity, durability, and crack resistance.
[0003] Meanwhile, traditional rebound hammers and similar equipment rely heavily on manual operation when testing concrete strength. This makes it difficult to maintain a perfectly perpendicular impact angle, leading to significant errors in the measurement results. The operator's experience and skill level directly affect the accuracy of the test data; even the slightest angular deviation can cause significant data differences. When encountering concrete structures containing reinforcing steel, directly impacting the steel reinforcement area will affect the accuracy of the test results due to the presence of the steel. The hardness of the steel reinforcement differs from that of concrete, altering the rebound value and failing to accurately reflect the concrete's inherent strength characteristics. This not only leads to incorrect assessments but may also mislead subsequent construction decisions, impacting the overall quality and safety of the project. Furthermore, frequent impact operations can easily cause equipment wear or sensor damage, placing high demands on the equipment's durability. Each impact places a certain load on the equipment; over time, this cumulative effect accelerates the aging process, increases maintenance costs, and shortens its lifespan. Utility Model Content
[0004] In order to overcome the problems of traditional rebound hammers and other equipment, which rely on manual operation, are difficult to avoid the steel reinforcement area, and are easily affected by frequent impacts, resulting in low detection accuracy and high equipment wear, this utility model provides a concrete strength testing device for road construction.
[0005] The technical solution is as follows: A concrete strength testing device for road construction includes a support frame; a mounting frame is fixedly connected to the lower end of the support frame; a fixing frame is provided at the lower end of the mounting frame; a testing frame is installed at the lower end of the fixing frame; a guide frame is installed between the testing frame and the fixing frame to ensure that the impact rod remains vertical during its up-and-down movement; an impact rod for obtaining strength information by impacting the concrete surface is vertically installed in the center of the mounting frame; multiple sets of racks are symmetrically arranged on both sides of the middle of the impact rod to convert the rotational motion of the motor into linear motion through gears; a first motor is provided on one side of the impact rod, and a first half-tooth gear is installed at the output end of the first motor and meshes with the rack on one side; a second motor is provided on the other side of the impact rod, and a second half-tooth gear is installed at the output end of the second motor and meshes with the rack on the other side; a pressure sensor is installed at the top of the impact rod.
[0006] Furthermore, a buffer plate is installed around the bottom end of the rack on the outside of the impact rod, and a limit plate is installed at the center of the bottom end of the detection frame. An impact hole corresponding to the impact rod is opened at the center of the surface of the limit plate.
[0007] Furthermore, a telescopic spring that penetrates the guide frame is installed between the limiting plate and the buffer plate. The telescopic spring has a spring damper inside, and a fixing plate is installed on the upper end of the guide frame outside the telescopic spring.
[0008] Furthermore, two sets of support plates are fixedly connected to both sides of the mounting frame, and an electromagnetic induction probe for identifying the position of the reinforcing bar by means of changes in the magnetic field is installed at the center of the bottom end of the support plate.
[0009] Furthermore, two sets of anti-slip grooves are symmetrically opened on both sides of the support frame, and a support ring is fastened to the upper end of the support frame.
[0010] Furthermore, an energy storage compartment is installed around the outside of the support ring, and a display screen is installed on the surface of the energy storage compartment. A connecting frame is fixedly connected to the center of the upper end of the energy storage compartment.
[0011] Furthermore, a switch corresponding to the energy storage compartment is installed at the center of the upper surface of the connecting frame, and a connecting plate is installed at the lower end of the energy storage compartment.
[0012] Furthermore, multiple sets of transmission slots are opened in the center of the connecting plate, and transmission rods corresponding to the transmission slots are installed at the upper end of the support frame.
[0013] The beneficial effects are as follows: This utility model ensures that the impact rod always moves vertically through the guide frame, avoiding angular deviations caused by manual operation, thereby significantly improving the accuracy and repeatability of measurement data. Equipped with an electromagnetic induction probe, it can identify the position of the steel bars inside the concrete in advance, avoiding invalid or misleading detection in the steel bar area, so that the detection results more accurately reflect the strength of the concrete itself. It is equipped with a composite buffer system consisting of a buffer plate, a limit plate, a telescopic spring, and a spring damper, which effectively absorbs impact energy, reduces equipment wear, and extends service life. It adopts a motor-driven rack and pinion transmission system to automate the impact process, reduce human intervention, improve detection efficiency, and is suitable for rapid on-site detection. It is not only suitable for road construction, but can also be widely used for quality inspection and acceptance of various concrete projects such as bridges, tunnels, and building structures. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the road construction concrete strength testing device of this utility model; Figure 2 This is a three-dimensional structural diagram of the limiting plate of this utility model; Figure 3 This is a three-dimensional structural diagram of the pressure sensor of this utility model; Figure 4 This is a three-dimensional structural diagram of the guide frame of this utility model; Figure 5 This is a three-dimensional structural diagram of the impact rod of this utility model.
[0015] In the attached diagram, the following are the reference numerals: 1. Support frame; 2. Anti-slip groove; 3. Support ring; 4. Energy storage compartment; 5. Display screen; 6. Connecting frame; 7. Switch; 8. Mounting frame; 9. Support plate; 10. Fixing frame; 11. Electromagnetic induction probe; 12. Detection frame; 13. Limiting plate; 14. Connecting plate; 15. Transmission groove; 16. Transmission rod; 17. Pressure sensor; 18. Impact hole; 19. Guide frame; 20. Fixing plate; 21. Impact rod; 22. Rack; 23. First motor; 24. First half gear; 25. Second motor; 26. Second half gear; 27. Buffer plate; 28. Telescopic spring. Detailed Implementation
[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0017] Among the currently discovered feasible technologies, the following are described: In road construction, concrete strength is one of the key indicators for measuring its mechanical properties and structural stability. The strength of road construction concrete mainly refers to its ability to resist failure under external forces, typically characterized by compressive strength. Compressive strength refers to the maximum pressure a standard-sized concrete specimen can withstand under specified loading conditions until failure, usually measured in megapascals (MPa). This indicator directly relates to the load-bearing capacity, durability, and service life of the road structure. Concrete strength is influenced by multiple factors. First, the quality of raw materials is crucial, including the type and grade of cement, the particle size and gradation of aggregates, and the type and proportion of admixtures. High-quality materials effectively improve the density and bonding strength of concrete, thereby enhancing its strength. Second, the water-cement ratio, i.e., the mass ratio of mixing water to cement, is important. A lower water-cement ratio results in lower porosity and higher strength after hardening; however, an excessively low water-cement ratio can affect workability, thus requiring reasonable control based on specific project requirements. Furthermore, aggregate type also significantly affects concrete strength. Coarse aggregate should be hard and have a rough surface to enhance its bond with cement paste; fine aggregate should be clean and well-graded to improve overall structural performance. In actual construction, the construction process is also a crucial factor determining the final strength of concrete. From mixing, transportation, pouring, vibration to curing, each step can affect the quality of concrete formation and strength development. For example, insufficient vibration can lead to voids or honeycombing within the concrete, reducing strength; while improper curing can hinder cement hydration, affecting later strength growth. In road engineering design and construction, the selection of concrete strength grade is paramount. Different parts experience different stresses, requiring different strength grades. For example, sections bearing heavy loads, such as road bases or bridge piers, typically use C30, C35, or even higher strength grades of concrete to ensure structural safety; while for sections with lower stress, such as sidewalks and curbs, lower strength grades like C20 or C25 can be used, meeting usage requirements while saving costs. In addition, different engineering sections also have different requirements for other concrete properties. For example, in addition to sufficient strength, pavement concrete should also possess good wear resistance, frost resistance, impermeability, and crack resistance to withstand long-term traffic loads and complex environmental conditions. Therefore, when selecting concrete mix proportions and construction schemes, the balance between strength and other performance indicators must be comprehensively considered to ensure project quality and durability.
[0018] In current road construction quality inspection, traditional rebound hammers and similar equipment are still widely used, but they have many limitations, especially when testing concrete strength, where the accuracy and stability of the test data are often difficult to guarantee. These devices are highly dependent on manual operation; testers need to manually press the instrument vertically onto the concrete surface to conduct the impact test. However, due to human factors, it is difficult to maintain a perfectly perpendicular impact angle. Even inexperience or slight operational deviations can lead to significant errors in the rebound values, affecting the judgment of concrete strength. More importantly, this manual testing method lacks standardized operating procedures, and test results from different operators and at different times can vary considerably, making the data lack good repeatability and comparability. The complex and variable environment of construction sites further increases the difficulty of maintaining consistent testing. Even skilled technicians are prone to operational errors under prolonged work or fatigue. Furthermore, the problem is even more pronounced when dealing with reinforced concrete structures. Because the presence of reinforcing steel significantly alters the surface hardness of concrete, directly impacting the reinforced area will not yield rebound values that accurately reflect the actual strength of the surrounding concrete. The stiffness and elastic modulus of steel bars are much higher than those of concrete, which can lead to sensor misjudgments and inflated strength values, posing a risk of misleading engineering quality assessments. If subsequent construction decisions are based on this distorted data, it may affect structural safety and create potential quality hazards. Furthermore, frequent impact operations cause significant mechanical wear on the testing equipment itself. Each impact applies stress to the internal transmission mechanism, spring system, and sensor components, easily leading to fatigue and even damage over time. Especially in high-intensity, high-frequency testing tasks, the aging process accelerates, maintenance costs increase, and lifespan is significantly shortened. This not only increases the economic burden of equipment replacement and repair but may also delay testing progress due to equipment failure, affecting overall project efficiency. Therefore, to improve the accuracy, stability, and durability of concrete strength testing equipment, a new type of testing device with greater automation, intelligence, and steel bar identification capabilities is designed to overcome the various drawbacks of traditional equipment and provide more reliable technical support for road engineering quality control.
[0019] like Figures 1-5As shown, the road construction concrete strength testing device includes a support frame 1; an installation frame 8 is fixedly connected to the lower end of the support frame 1, a fixed frame 10 is provided at the lower end of the installation frame 8, a testing frame 12 is installed at the lower end of the fixed frame 10, a guide frame 19 is installed between the testing frame 12 and the fixed frame 10 to ensure that the impact rod 21 remains vertical during its up-and-down movement, an impact rod 21 for obtaining strength information by impacting the concrete surface is vertically installed in the center of the installation frame 8, multiple sets of racks 22 are symmetrically arranged on both sides of the middle of the impact rod 21 to convert the rotational motion of the motor into linear motion through gears, a first motor 23 is provided on one side of the impact rod 21, a first half-tooth gear 24 that meshes with the rack 22 on one side is installed at the output end of the first motor 23, and a second motor 25 is provided on the other side of the impact rod 21, a second half-tooth gear 26 that meshes with the rack 22 on the other side is installed at the output end of the second motor 25, and a pressure sensor 17 is installed at the top of the impact rod 21.
[0020] A buffer plate 27 is mounted around the bottom of the rack 22 on the outer side of the impact rod 21. A limit plate 13 is mounted at the center of the bottom of the detection frame 12. An impact hole 18 corresponding to the impact rod 21 is opened at the center of the surface of the limit plate 13. The buffer plate 27 and the limit plate 13 cooperate to achieve precise guidance and impact positioning, prevent deviation and protect the equipment. A telescopic spring 28 is installed between the limit plate 13 and the buffer plate 27, which passes through the guide frame 19. A spring damper is installed inside the telescopic spring 28. A fixing plate 20 is installed on the upper end of the guide frame 19 outside the telescopic spring 28. The combination of spring and damper effectively absorbs impact energy and improves the stability and service life of the equipment.
[0021] The entire device is fixed to the concrete surface by a support frame 1. The internal impact rod 21 moves up and down to impact the concrete. Racks 22 on both sides of the impact rod 21 are driven by two motors, which move the racks 22 up and down via half-gears, allowing the impact rod 21 to perform stable vertical reciprocating motion. When the impact rod 21 impacts downwards, it passes through the impact hole 18 in the center of the limiting plate 13, precisely striking the concrete surface. A buffer plate 27 cooperates with the limiting plate 13 to ensure the impact rod 21 does not deviate and protects the equipment structure from damage. The vibration energy generated during the impact is absorbed by the telescopic spring 28 between the limiting plate 13 and the buffer plate 27. The damper inside the spring further reduces vibration, preventing damage from frequent impacts and improving the stability and accuracy of the testing process. The fixing plate 20 provides support and limits, keeping the spring and guide frame 19 in the correct position, ensuring the entire system maintains good performance even after repeated use.
[0022] Please see Figures 3-4The mounting frame 8 has two sets of support plates 9 fixedly connected to both sides. An electromagnetic induction probe 11 for identifying the position of reinforcing bars through magnetic field changes is installed at the center of the bottom of each support plate 9. This allows for early detection of the reinforcing bar position inside the concrete, avoiding false detections in the reinforcing bar area and improving data accuracy. Two sets of anti-slip grooves 2 are symmetrically provided on both sides of the support frame 1. A support ring 3 is fastened to the upper end of the support frame 1. The anti-slip grooves 2 enhance the stability of the equipment placement and prevent slippage or tilting during detection. An energy storage chamber 4 is installed around the outside of the support ring 3. A display screen 5 is installed on the surface of the energy storage chamber 4. The upper center of the energy storage chamber 4 is fixedly connected to… The device is connected to a connecting frame 6, and the energy storage compartment 4 integrates power supply and data display functions, facilitating on-site operation and data reading. A switch 7 corresponding to the energy storage compartment 4 is installed at the center of the upper surface of the connecting frame 6. A connecting plate 14 is installed at the lower end of the inside of the energy storage compartment 4. The switch 7 and the connecting plate 14 realize power control and internal circuit connection to ensure safe operation of the equipment. Multiple sets of transmission slots 15 are opened in the center of the inside of the connecting plate 14. A transmission rod 16 corresponding to the transmission slot 15 is installed at the upper end of the inside of the support frame 1. The transmission slots 15 and the transmission rods 16 work together to realize stable transmission of electrical signals or data, improving the overall coordination of the system.
[0023] Electromagnetic induction probes 11 are installed at the bottom of the support plates 9 on both sides of the mounting frame 8. Before the test begins, they scan the concrete for reinforcing steel bars to avoid impact testing at the steel bar locations and prevent data distortion. The entire device is fixed to the ground by the support frame 1. The anti-slip grooves 2 on both sides increase the friction with the ground to prevent the device from sliding or tilting during operation, ensuring a stable and reliable testing process. The support ring 3 is connected to the top of the support frame 1 and surrounds the energy storage chamber 4. It not only provides power to the entire device but also has a display screen 5 that can display the test results and device status in real time for easy viewing by operators. A switch 7 is connected to the top of the energy storage chamber 4 through a connecting frame 6 to control the power supply of the entire device. A connecting plate 14 is located at the bottom inside the energy storage chamber 4. It works with the switch 7 to connect and disconnect the circuit, ensuring the electrical safety of the device. The transmission groove 15 on the connecting plate 14 works with the transmission rod 16 inside the support frame 1 to stably transmit the data collected by the sensor, ensuring smooth signal transmission between various components and improving the overall system's collaborative efficiency.
[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A concrete strength testing device for road construction, characterized in that, The system includes a support frame (1); a mounting frame (8) is fixedly connected to the lower end of the support frame (1); a fixing frame (10) is provided at the lower end of the mounting frame (8); a testing frame (12) is installed at the lower end of the fixing frame (10); a guide frame (19) is installed between the testing frame (12) and the fixing frame (10) to ensure that the impact rod (21) remains vertical during its up-and-down movement; an impact rod (21) for obtaining strength information by impacting the concrete surface is vertically installed in the center of the mounting frame (8); and the impact rod (21) has two sides in the middle. Multiple racks (22) are symmetrically arranged to convert the rotational motion of the motor into linear motion through gears. A first motor (23) is provided on one side of the impact rod (21). A first half-tooth gear (24) that meshes with the rack (22) on one side is installed at the output end of the first motor (23). A second motor (25) is provided on the other side of the impact rod (21). A second half-tooth gear (26) that meshes with the rack (22) on the other side is installed at the output end of the second motor (25). A pressure sensor (17) is installed at the top of the impact rod (21).
2. The road construction concrete strength testing device according to claim 1, characterized in that, A buffer plate (27) is installed around the bottom of the rack (22) on the outside of the impact rod (21). A limit plate (13) is installed at the center of the bottom of the detection frame (12). An impact hole (18) corresponding to the impact rod (21) is opened at the center of the surface of the limit plate (13).
3. The road construction concrete strength testing device according to claim 2, characterized in that, A telescopic spring (28) that passes through the guide frame (19) is installed between the limiting plate (13) and the buffer plate (27). The telescopic spring (28) is equipped with a spring damper inside. A fixing plate (20) is installed on the upper end of the guide frame (19) outside the telescopic spring (28).
4. The road construction concrete strength testing device according to claim 1, characterized in that, The mounting bracket (8) has two sets of support plates (9) fixedly connected to both sides. An electromagnetic induction probe (11) for identifying the position of the reinforcing bar by changing the magnetic field is installed in the center of the bottom end of the support plate (9).
5. The road construction concrete strength testing device according to claim 1, characterized in that, The support frame (1) has two sets of anti-slip grooves (2) symmetrically opened on both sides, and the upper end of the support frame (1) is fastened with a support ring (3).
6. The road construction concrete strength testing device according to claim 5, characterized in that, A power storage compartment (4) is installed around the outside of the support ring (3). A display screen (5) is provided on the surface of the power storage compartment (4). A connecting frame (6) is fixedly connected to the center of the upper end of the power storage compartment (4).
7. The road construction concrete strength testing device according to claim 6, characterized in that, A switch (7) corresponding to the energy storage compartment (4) is installed at the center of the upper surface of the connecting frame (6), and a connecting plate (14) is installed at the lower end of the inside of the energy storage compartment (4).
8. The road construction concrete strength testing device according to claim 7, characterized in that, Multiple transmission slots (15) are opened in the center of the connecting plate (14), and a transmission rod (16) corresponding to the transmission slot (15) is installed at the upper end of the support frame (1).