A device for determining the modulus of elasticity of road concrete

Abstract

The utility model belongs to the road concrete detection technical field, concretely relates to a kind of road concrete elastic modulus determination device, including wide band noise wave generator, the lateral wall of wide band noise wave generator is provided with storage box, the lateral wall of wide band noise wave generator is equipped with rectangular block, recess is established in the bottom of rectangular block, the inside of rectangular block is equipped with bidirectional screw rod, the surface of bidirectional screw rod is connected with threaded sleeve.The utility model can stably fix storage box on the lateral wall of wide band noise wave generator by the synergic cooperation of bidirectional screw rod, threaded sleeve and fixed block.In this way, after the use of metal probe, the disassembled metal probe and its connecting line can be stored in the storage box.This avoids the trouble of storing the removed metal probe and connecting line separately, and also eliminates the need to retrieve them during subsequent use, thereby saving time and improving detection efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of road concrete testing technology, specifically relating to a device for measuring the elastic modulus of road concrete. Background Technology

[0002] Road concrete, as a material used for road surface paving, must withstand repeated vehicle loads, thus requiring high strength to ensure the durability and load-bearing capacity of the road surface. Its design strength grade is typically between C30 and C50. For concrete materials, the dynamic modulus of elasticity is closely related to its internal structure (such as porosity, microcrack distribution, and the interfacial bonding between aggregates and the cement matrix). By monitoring the dynamic modulus of elasticity, the overall stiffness, internal damage level, and durability of concrete can be assessed. The concrete dynamic modulus of elasticity measuring instrument is based on the relationship between the natural resonant frequency of an object and its density and strength, employing the resonance method principle. The instrument emits vibration waves of different frequencies to the concrete specimen through a transmitting probe. When the emitted frequency matches the natural resonant frequency of the specimen, the specimen resonates. At this point, the receiving probe receives the signal, measures the resonant frequency of the specimen, and then calculates the elastic modulus of the concrete.

[0003] However, this measuring instrument has some problems in actual use. Taking the use of the metal probe as an example, after use, the connecting cable of the metal probe needs to be removed from the broadband noise generator, but there is no storage device for the metal probe and connecting cable on one side of the broadband noise generator. This means that the removed metal probe and connecting cable must be stored separately, and then retrieved again for subsequent use, which inevitably wastes time and affects the detection efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a device for measuring the elastic modulus of road concrete. This addresses the problem in existing technologies, such as those using a metal probe. After use, the metal probe's connecting cable needs to be removed from the broadband noise generator, but the generator lacks a storage device for the metal probe and connecting cable. This forces the removed metal probe and cable to be stored separately, requiring them to be retrieved again for subsequent use, inevitably wasting time and affecting testing efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for measuring the elastic modulus of road concrete, comprising a broadband noise wave generator, a control panel embedded in the front end of the broadband noise wave generator, a metal probe disposed on one side of the broadband noise wave generator, a connecting wire connected to one side of the metal probe, a storage box disposed on the side wall of the broadband noise wave generator, a rectangular block mounted on the side wall of the broadband noise wave generator, a groove formed at the bottom end of the rectangular block, a bidirectional threaded rod assembled inside the rectangular block, a threaded sleeve connected to the surface of the bidirectional threaded rod, and a fixing block connected to the bottom end of the threaded sleeve.

[0006] In a preferred embodiment of the road concrete elastic modulus measuring device of this utility model, the bidirectional threaded rod can be rotatably connected to the rectangular block via a bearing.

[0007] In a preferred embodiment of the road concrete elastic modulus measuring device of this utility model, the threaded sleeve is adapted to the size of the groove, and the two threaded sleeves are distributed at the center of the symmetrical bidirectional threaded rod.

[0008] As a preferred embodiment of the road concrete elastic modulus measuring device of this utility model, the storage box can be detachably and fixedly connected to the broadband noise wave generator through a bidirectional threaded rod, a threaded sleeve and a fixing block.

[0009] In a preferred embodiment of the road concrete elastic modulus measuring device of this utility model, the back end of the broadband noise wave generator is connected to an interface, the back end of the broadband noise wave generator is connected to a support block, a spring is installed inside the support block, a connecting rod is connected to the top of the spring, and a limit block is connected to the top of the connecting rod.

[0010] In a preferred embodiment of the road concrete elastic modulus measuring device of this utility model, the connecting rod can be elastically telescopically connected to the support block via a spring.

[0011] In a preferred embodiment of the road concrete elastic modulus measuring device of this utility model, the connecting wire is inserted into the insertion interface, and the limiting block can be detachably and fixedly connected to the connecting wire through the connecting rod, spring and support block.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The storage box is securely fixed to the side wall of the broadband noise generator through the coordinated action of the bidirectional threaded rod, threaded sleeve, and fixing block. This allows the disassembled metal probe and its connecting wires to be stored together in the storage box after use. This avoids the hassle of separately storing the removed metal probe and connecting wires, and eliminates the need to retrieve them again for subsequent use, thus saving time and effectively improving testing efficiency.

[0014] Through the cooperation of the support block, the limiting block, the spring and the connecting rod, after the connecting wire is plugged into the interface on the back of the broadband noise wave generator, the limiting block can restrict the connecting wire and prevent it from detaching from the interface due to movement during the use of the metal probe. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0017] Figure 2 This is a schematic diagram of the rear view of the main body structure of this utility model;

[0018] Figure 3 This is a cross-sectional view of the connection structure of the storage box of this utility model;

[0019] Figure 4 This is a schematic diagram of the rear view of the storage box of this utility model;

[0020] Figure 5 This is a schematic diagram of the support block and limiting block structure of this utility model.

[0021] In the diagram: 1. Wideband noise wave generator; 2. Control panel; 3. Connecting cable; 4. Metal probe; 5. Storage box; 6. Rectangular block; 7. Groove; 8. Bidirectional threaded rod; 9. Threaded sleeve; 10. Fixing block; 11. Plug interface; 12. Support block; 13. Limiting block; 14. Spring; 15. Connecting rod. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-5This utility model provides the following technical solution: a device for measuring the elastic modulus of road concrete, including a wideband noise wave generator 1, a control panel 2 embedded in the front end of the wideband noise wave generator 1, a metal probe 4 provided on one side of the wideband noise wave generator 1, a connecting wire 3 connected to one side of the metal probe 4, a storage box 5 provided on the side wall of the wideband noise wave generator 1, a rectangular block 6 installed on the side wall of the wideband noise wave generator 1, a groove 7 opened at the bottom end of the rectangular block 6, a bidirectional threaded rod 8 assembled inside the rectangular block 6, a threaded sleeve 9 connected to the surface of the bidirectional threaded rod 8, and a fixing block 10 connected to the bottom end of the threaded sleeve 9.

[0024] It should be noted that the DT-16 concrete dynamic modulus measuring instrument consists of the main components, including the wideband noise generator 1, control panel 2, metal probe 4, and connecting cable 3. Based on the relationship between the natural resonant frequency of road concrete and its density and strength, it employs the resonance method. The instrument emits vibration waves of different frequencies to the concrete specimen through the transmitting probe. When the emitted frequency matches the natural resonant frequency of the specimen, the specimen resonates. The receiving probe then receives the signal and measures the resonant frequency of the specimen, thereby calculating the elastic modulus of the concrete. In other words, by bringing the metal probe 4 close to the road concrete and activating the wideband noise generator 1, the road concrete will resonate when its emitted frequency matches the natural resonant frequency of the road concrete. The receiving probe then receives the signal, measures the resonant frequency of the road concrete, and calculates the elastic modulus of the concrete. The model of the wideband noise generator 1 is Rohde & Schwarz SMB100A.

[0025] Preferably, the bidirectional threaded rod 8 can be rotatably connected to the rectangular block 6 through a bearing, the threaded sleeve 9 is adapted to the size of the groove 7, the two threaded sleeves 9 are symmetrically distributed at the center of the bidirectional threaded rod 8, and the storage box 5 can be detachably and fixedly connected to the broadband noise wave generator 1 through the bidirectional threaded rod 8, the threaded sleeve 9 and the fixing block 10.

[0026] In practical use, after completing the measurement of the elastic modulus of road concrete, the operator needs to unplug the connecting cable 3 from the connector 11 on the back of the broadband noise generator 1, and then properly store the metal probe 4 and its connecting cable 3 in the storage box 5. This design successfully avoids the cumbersome process of storing the removed metal probe 4 and connecting cable 3 separately, and eliminates the need to spend time searching for and retrieving them during subsequent tests, effectively shortening the preparation time before testing and significantly improving the overall testing efficiency.

[0027] It is worth noting that when the operator rotates the bidirectional threaded rod 8 clockwise, allowing it to rotate stably inside the rectangular block 6, the threaded sleeve 9 moves according to the threads on the surface of the bidirectional threaded rod 8 and gradually approaches each other. As the threaded sleeve 9 moves closer, the fixing block 10 connected to it also converges towards the center. At this point, the fixing block 10 and the pre-set mounting ears on the side of the storage box 5 are precisely aligned, forming a stable locking structure and reliably fixing the storage box 5.

[0028] Conversely, if the storage box 5 needs to be disassembled, the operator only needs to rotate the bidirectional threaded rod 8 counterclockwise. The threaded sleeve 9 will then move in the opposite direction along the threaded path and gradually move away, thereby causing the fixing block 10 to separate synchronously. As the fixing block 10 separates from the mounting ear, the fixed state of the storage box 5 is released, and it can be easily removed for maintenance or adjustment.

[0029] Preferably, the back end of the wideband noise wave generator 1 is connected to a plug interface 11, and the back end of the wideband noise wave generator 1 is connected to a support block 12. A spring 14 is installed inside the support block 12, and a connecting rod 15 is connected to the top of the spring 14. A limit block 13 is connected to the top of the connecting rod 15. The connecting rod 15 can form an elastic telescopic connection with the support block 12 through the spring 14. The connecting wire 3 is plugged into the plug interface 11. The limit block 13 can form a detachable and fixed connection with the connecting wire 3 through the connecting rod 15, the spring 14 and the support block 12.

[0030] In practical use, when the operator manually moves the limiting block 13 towards the support block 12, the limiting block 13 will simultaneously drive the connecting rod 15 to compress the spring 14 inward, causing the spring 14 to elastically contract and deform. During this process, the limiting block 13 gradually moves away from the position of the plug-in interface 11, making room for subsequent operations. At this time, the operator can then easily pull the connecting wire 3 out of the plug-in interface 11.

[0031] When it is necessary to reconnect the connecting wire 3 to the connector 11, the operator only needs to release the previously moved limiting block 13. Under the action of the elastic restoring force of the spring 14, the limiting block 13 will automatically reset along the predetermined trajectory and accurately cover the connector 11 again, thereby effectively fixing the connecting wire 3 inserted into the connector 11 and preventing it from loosening or accidentally falling off.

[0032] Working principle: When measuring the elastic modulus of road concrete, the operator manually moves the limiting block 13 towards the support block 12. At this time, the limiting block 13 compresses the spring 14 inward through the connecting rod 15, triggering the elastic compression deformation of the spring 14. As the limiting block 13 moves, it gradually moves away from the coverage area of ​​the connector 11, freeing up space for subsequent connection operations. After accurately inserting the connecting wire 3 into the connector 11 at the back end of the broadband noise generator 1, the operator releases the limiting block 13. Under the action of elastic restoring force, the spring 14 drives the limiting block 13 to reset along a preset trajectory, re-covering the area above the connector 11, forming a stable limit on the connecting wire 3, effectively preventing loosening or accidental detachment due to external force during the testing process. The operator attaches the metal probe 4 to the surface of the road concrete to be tested, and the control panel 2 starts the broadband noise generator 1 to generate a broadband excitation signal. When the device's transmission frequency resonates with the natural resonant frequency of the concrete, the concrete structure will produce a significant vibration response. At this point, the vibration signal is accurately captured by the matching receiving probe, and the resonant frequency characteristic parameters of the concrete are measured using spectrum analysis technology. Based on the elasticity theory model, the elastic modulus of the concrete material can be calculated through the mathematical correlation between the resonant frequency and the elastic modulus. After the test is completed, the operator moves the limiting block 13 again to trigger the compression mechanism of the spring 14, releasing the limiting block 13 from the plug interface 11, creating conditions for the connection wire 3 to be pulled out. After the connection wire 3 is pulled out of the plug interface 11, it is stored together with the metal probe 4 in the storage box 5 provided with the device.

[0033] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for measuring the elastic modulus of road concrete, comprising a broadband noise wave generator (1), characterized in that: The front end of the wideband noise generator (1) is embedded with a control panel (2), a metal probe (4) is provided on one side of the wideband noise generator (1), a connecting line (3) is connected to one side of the metal probe (4), and a storage box (5) is provided on the side wall of the wideband noise generator (1). The wideband noise wave generator (1) has a rectangular block (6) installed on its side wall. The bottom end of the rectangular block (6) has a groove (7). The interior of the rectangular block (6) is equipped with a bidirectional threaded rod (8). The surface of the bidirectional threaded rod (8) is connected to a threaded sleeve (9). The bottom end of the threaded sleeve (9) is connected to a fixing block (10).

2. The device for measuring the elastic modulus of road concrete according to claim 1, characterized in that: The bidirectional threaded rod (8) can be rotatably connected to the rectangular block (6) via a bearing.

3. The device for measuring the elastic modulus of road concrete according to claim 1, characterized in that: The threaded sleeve (9) is adapted to the size of the groove (7), and the two threaded sleeves (9) are distributed at the center of the symmetrical bidirectional threaded rod (8).

4. The device for measuring the elastic modulus of road concrete according to claim 1, characterized in that: The storage box (5) can be detachably and fixedly connected to the broadband noise wave generator (1) via a bidirectional threaded rod (8), a threaded sleeve (9) and a fixing block (10).

5. The device for measuring the elastic modulus of road concrete according to claim 1, characterized in that: The back end of the wideband noise wave generator (1) is connected to a plug interface (11), and the back end of the wideband noise wave generator (1) is connected to a support block (12). A spring (14) is installed inside the support block (12), and a connecting rod (15) is connected to the top of the spring (14). A limit block (13) is connected to the top of the connecting rod (15).

6. The device for measuring the elastic modulus of road concrete according to claim 5, characterized in that: The connecting rod (15) can be elastically telescopically connected to the support block (12) via the spring (14).

7. The device for measuring the elastic modulus of road concrete according to claim 5, characterized in that: The connecting line (3) is inserted into the plug-in interface (11), and the limiting block (13) can be detachably and fixedly connected with the connecting line (3) through the connecting rod (15), spring (14) and support block (12).

Images