Ultrasonic scanning device for measuring thickness of each layer of asphalt pavement

Abstract

The utility model relates to an ultrasonic scanning device for measuring the thickness of each layer of an asphalt pavement, belongs to the technical field of asphalt pavement thickness measurement, and solves the problem that the measurement precision is not accurate enough due to the fact that the receiving position of a reflected wave signal cannot be accurately positioned when the thickness of the surface layer of the traditional asphalt pavement is measured. The utility model relates to an ultrasonic scanning device for measuring the thickness of each layer of an asphalt pavement, which is characterized in that a transmitting ultrasonic angle probe and a receiving ultrasonic angle probe are used for acquiring interface echoes of each layer of the asphalt pavement, and the asphalt thickness of each layer is calculated according to sound velocity and corresponding geometrical relationship by accurately positioning the echo acquisition position. The thickness of each layer of the surface layer of the asphalt pavement can be measured losslessly, quickly and accurately.

Description

Technical Field

[0001] The utility model relates to the technical field of asphalt pavement thickness measurement, in particular to an ultrasonic scanning device for measuring the thickness of each layer of an asphalt pavement. Background Art

[0002] Asphalt pavement is usually composed of a multi-layer structure, mainly including the base layer, subbase layer, middle layer and the topmost surface layer. Among them, the surface layer includes: surface layer, upper layer and lower layer from top to bottom.

[0003] Currently, the thickness of asphalt pavement layers is mostly measured using destructive core sampling methods. This method is labor-intensive, time-consuming, costly, and inefficient, and can also damage the pavement structure. Consequently, simple, rapid, and non-destructive pavement testing technologies, such as ground-penetrating radar (GPR), imaging, and ultrasonic testing, have been developed.

[0004] However, when measuring the thickness of each layer in an asphalt surface, higher measurement accuracy is required because the dielectric constants of the layers vary little or not at all, and each layer is relatively thin. Ultrasonic testing technology, with its stronger layer-by-layer thickness measurement capabilities and accuracy, offers significant advantages over other technologies.

[0005] However, the ultrasonic detection device is greatly affected by the material properties and internal structure. The porosity and viscoelasticity of asphalt concrete will affect the propagation and reflection of ultrasonic waves, making it difficult to accurately locate the receiving position of the reflected wave signal, which has an adverse effect on the thickness measurement accuracy. Utility Model Content

[0006] In view of the above analysis, the embodiment of the present utility model aims to provide an ultrasonic scanning device for measuring the thickness of each layer of asphalt pavement, so as to solve the problem that when the existing ultrasonic non-destructive testing device measures the thickness of each layer in the asphalt pavement surface layer, the reflected wave signal receiving position is difficult to accurately locate and the measurement accuracy is limited.

[0007] The utility model provides an ultrasonic scanning device for measuring the thickness of each layer of asphalt pavement, comprising an ultrasonic transmitting structural unit, an ultrasonic receiving structural unit, a scale rod and a movable device;

[0008] The ultrasonic transmitting structural unit and the ultrasonic receiving structural unit are arranged on the same side of the scale rod, and both ends of the scale rod are respectively mounted on the movable device;

[0009] The ultrasonic transmitting structural unit includes a transmitting probe, a transmitting probe connection box, a transmitting probe clamping device, a transmitting probe support rod, and a transmitting slider;

[0010] The ultrasonic receiving structural unit includes a receiving probe, a receiving probe connecting box, a receiving probe clamping device, a receiving probe supporting rod, and a receiving sliding block.

[0011] Furthermore, the transmitting probe is fixed on the transmitting probe connecting box, the transmitting probe connecting box is fixedly connected to one end of the transmitting probe support rod through the transmitting probe clamping device, and the other end of the transmitting probe support rod is connected to the scale rod through the transmitting slider.

[0012] Furthermore, the receiving probe is fixed on the receiving probe connecting box, which is fixedly connected to one end of the receiving probe supporting rod through the receiving probe clamping device, and the other end of the receiving probe supporting rod is connected to the scale rod through the receiving slider.

[0013] Furthermore, the scale rod is provided with a groove for installing a transmitting slider and a receiving slider. The transmitting slider and the receiving slider can move along the groove of the scale rod to drive the transmitting probe and the receiving probe to move, thereby adjusting the span between the transmitting probe and the receiving probe.

[0014] Furthermore, the scale rod has a length of 100 to 500 mm and is marked with scales, with the smallest unit scale being 1 mm or 2 mm.

[0015] Furthermore, the transmitting probe connection box and the receiving probe connection box are connected to the ultrasound equipment via cables.

[0016] Furthermore, the direction of the transmitting probe connection box is adjustable, and the transmission angle can be adjusted by rotating the direction of the transmitting probe connection box.

[0017] Furthermore, an ultrasonic transducer is installed inside the transmitting probe for generating an ultrasonic signal for transmission; and the transmitting probe connection box is used for signal amplification and filtering.

[0018] Furthermore, the receiving probe is internally provided with an ultrasonic wave receiving transducer for receiving ultrasonic wave signals; the receiving probe connection box is used to transmit the received ultrasonic wave signals.

[0019] Furthermore, the movable device includes wheels for supporting the entire ultrasonic scanning device and for rolling on the asphalt road surface, so that the probe can move along the road surface.

[0020] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0021] 1) The ultrasonic scanning device of this utility model is equipped with a graduated rod. The scale on the rod allows the operator to make precise adjustments in 2mm units and accurately measure the span between the transmitting and receiving probes. This allows the precise location of the reflected wave signal, improving measurement accuracy.

[0022] 2) The direction of the rotating transmitting probe connection box of the ultrasonic scanning device of the present invention is adjustable, and the tilt angle of the transmitting probe can be achieved by rotating the direction of the transmitting probe connection box, thereby improving the flexibility of measurement.

[0023] 3) This ultrasonic scanning device can adjust the span between the transmitting and receiving probes and can be connected to a thickness measurement module for rapid, efficient, and non-destructive testing of asphalt thickness. This improved measurement accuracy will help enhance asphalt pavement construction control and inspection capabilities, saving significant human resources.

[0024] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages will become apparent from the description or be understood through practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference symbols denote the same components.

[0026] Figure 1 This is a top view of the ultrasonic scanning device of the present invention;

[0027] Figure 2 This is an enlarged schematic diagram of the transmitting probe of the ultrasonic scanning device of the present invention;

[0028] Figure 3 This is a front view of the ultrasonic scanning device of the present invention;

[0029] Figure 4 It is a side view of the ultrasonic scanning device of the present invention.

[0030] Reference numerals:

[0031] 1-transmitting probe; 2-receiving probe; 3-wheel; 4-transmitting slider; 5-receiving slider; 6-transmitting probe clamping device; 7-receiving probe clamping device; 8-transmitting probe support rod; 9-receiving probe support rod; 10-scale rod; 11-transmitting probe connection box; 12-receiving probe connection box. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0033] The utility model provides an ultrasonic scanning device for measuring the thickness of each layer of asphalt pavement, comprising an ultrasonic transmitting structural unit, an ultrasonic receiving structural unit, a scale rod 10 and a moving device;

[0034] The ultrasonic transmitting structural unit and the ultrasonic receiving structural unit are arranged on the same side of the scale rod 10 , and both ends of the scale rod 10 are respectively mounted on the moving device.

[0035] The ultrasonic transmitting structural unit includes a transmitting probe 1, a transmitting probe connecting box 11, a transmitting probe clamping device 6, a transmitting probe supporting rod 8, and a transmitting slider 4;

[0036] The transmitting probe 1 is fixed on the transmitting probe connection box 11, and the transmitting probe connection box 11 is fixedly connected to one end of the transmitting probe support rod 8 through the transmitting probe clamping device 6, and the other end of the transmitting probe support rod 8 is connected to the scale rod 10 through the transmitting slider 4;

[0037] The ultrasonic receiving structural unit includes a receiving probe 2, a receiving probe connecting box 12, a receiving probe clamping device 7, a receiving probe supporting rod 9, and a receiving slider 5;

[0038] The receiving probe 2 is fixed to the receiving probe connection box 12, and the receiving probe connection box 12 is fixedly connected to one end of the receiving probe support rod 9 through the receiving probe clamping device 7. The other end of the receiving probe support rod 9 is connected to the scale rod 10 through the receiving slider 5;

[0039] The transmitting probe connection box 11 and the receiving probe connection box 12 are connected to the ultrasonic device via cables; the scale rod 10 is connected to the transmitting slider 4 and the receiving slider 5 and is used to adjust the distance between the probes.

[0040] Specifically, the structure of each component of the ultrasonic emission structural unit is as follows:

[0041] The transmitting probe 1 can be a cylindrical device with an ultrasonic transducer installed inside, which is used to generate and transmit ultrasonic signals and tilt them to the surface of the material at an angle of θ.

[0042] The transmitting probe connection box 11 is connected to the transmitting probe 1 and is also connected to the ultrasonic equipment for signal amplification and filtering.

[0043] The transmitting probe clamping device 6 is used to fix the transmitting probe 1 to ensure its stability when transmitting signals.

[0044] The transmitting probe support rod 8 is used to connect the transmitting probe 1 and the transmitting slider 4 to provide support and stability for the probe.

[0045] The transmitting slider 4 is connected to the transmitting probe 1 and the support rod, and when it moves, it can drive the transmitting probe 1 to move within a certain range on the scale rod 10 to adapt to different measurement positions.

[0046] Furthermore, the direction of the transmitting probe connection box 11 is adjustable, and the tilt angle θ of the transmitting probe 1 can be achieved by rotating the direction of the transmitting probe connection box 11 .

[0047] In one possible design, the transmitting probe connecting box 11 and the transmitting probe clamping device 6 include a rotating joint, allowing the transmitting probe connecting box 11 to rotate around a fixed axis. During rotation, the transmitting probe 1 fixed on the transmitting probe connecting box 11 rotates together with the transmitting probe connecting box 11, thereby changing the incident direction of the ultrasonic wave.

[0048] Specifically, the components of the ultrasonic receiving structural unit are structured as follows:

[0049] The receiving probe 2 is similar to the transmitting probe 1 and is also a cylindrical device with an ultrasonic wave receiving transducer installed inside, which is used to receive the ultrasonic signal emitted by the transmitting probe 1 and reflected by the surface of the material.

[0050] The receiving probe connection box 12 is connected to the receiving probe 2 and is also connected to the ultrasound device for transmitting the received ultrasound signal.

[0051] The receiving probe clamping device 7 is used to fix the receiving probe 2 to ensure its stability during the measurement process.

[0052] The receiving probe support rod 9 is used to connect the receiving probe 2 and the receiving slider 5 to provide support and stability for the probe.

[0053] The receiving slider 5 connects the receiving probe 2 and the support rod, and when it moves, it can drive the receiving probe 2 to move within a certain range on the scale rod 10 to adapt to different measurement positions.

[0054] Furthermore, the scale rod 10 has a length of 100 to 500 mm and is marked with scales, with the smallest unit scale being 1 mm or 2 mm. These scales allow the operator to make precise adjustments in units of 2 mm and accurately measure the span between the transmitting probe and the receiving probe 2 .

[0055] Furthermore, the scale bar 10 is provided with a groove for mounting the transmitting and receiving sliders 4 and 5. These sliders can be moved along the grooves of the scale bar 10 to adjust the span PCS between the transmitting and receiving probes 1 and 2, ensuring that the receiving probe 2 can receive the main acoustic beam reflected by the transmitting probe 1 at the asphalt pavement interface. The scale bar 10 provides a measurable movement path, enabling precise positioning of the transmitting and receiving probes 1 and 2, which is crucial for ensuring the accuracy of the ultrasonic scanning device in measuring the thickness of each layer of the asphalt pavement.

[0056] In one possible implementation, the span PCS between the transmitting probe 1 and the receiving probe 2 is adjusted. First, the PCS value D is estimated based on the target thickness h and the oblique angle of incidence θ, where D = 2h × tanθ. This provides an approximate range for the location where the ultrasonic reflection signal is received, improving measurement accuracy. Targeted adjustments are then made within a 5% tolerance for D, with adjustments made every 2 mm between D - 5% × D and D + 5% × D, until the receiving probe 2 can detect the reflected echo from the transmitting probe 1's main beam at the asphalt pavement interface. The actual PCS value d is then determined, further improving measurement accuracy.

[0057] Furthermore, the ultrasonic scanning device is fixed on a mobile device with wheels 3, and the wheels 3 are installed at the bottom of the device to support the entire device and to roll on the asphalt road surface so that the probe can move along the road surface.

[0058] Furthermore, the ultrasonic scanning device can be connected to a thickness measurement module to measure the asphalt thickness H. The asphalt thickness H is obtained by the following formula:

[0059]

[0060] Where H is the asphalt thickness in mm; t is the echo arrival time in μs; v is the speed of sound in m / s; PCS is the span between the transmitting probe 1 and the receiving probe 2 in mm.

[0061] Furthermore, the thickness measurement module may be connected to a time signal processing module to obtain the echo arrival time t.

[0062] Specifically, the time signal processing module uses algorithms to determine the envelope of each signal frame within a specific timeframe, the echo arrival time sequence for each frame, the time center of each class, and the weight of each class center. Ultimately, it calculates the echo arrival time (t). This module can quickly and accurately determine the echo arrival time (t), avoiding instability caused by jitter in the original signal and improving measurement accuracy.

[0063] Compared with the existing technology, the ultrasonic scanning device of the utility model for measuring the thickness of each layer of asphalt pavement solves the problem of insufficient measurement accuracy caused by the inability of traditional devices to accurately locate the receiving position of the reflected wave signal when measuring the thickness of the asphalt pavement surface layer, and realizes non-destructive, rapid and accurate measurement of the thickness of each layer of the asphalt pavement surface layer.

[0064] The protection scope of the present invention is not limited thereto, and any changes or replacements that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrasonic scanning device for measuring the thickness of each layer of asphalt pavement, characterized in that: It comprises an ultrasonic transmitting structural unit, an ultrasonic receiving structural unit, a scale rod (10) and a movable device; The ultrasonic transmitting structural unit and the ultrasonic receiving structural unit are arranged on the same side of the scale rod (10), and both ends of the scale rod (10) are respectively mounted on a movable device; The ultrasonic transmitting structural unit comprises a transmitting probe (1), a transmitting probe connecting box (11), a transmitting probe clamping device (6), a transmitting probe supporting rod (8), and a transmitting slider (4); The ultrasonic receiving structural unit comprises a receiving probe (2), a receiving probe connecting box (12), a receiving probe clamping device (7), a receiving probe supporting rod (9), and a receiving slider (5).

2. The ultrasonic scanning device according to claim 1, characterized in that: The transmitting probe (1) is fixed on a transmitting probe connection box (11), the transmitting probe connection box (11) is fixedly connected to one end of a transmitting probe support rod (8) via a transmitting probe clamping device (6), and the other end of the transmitting probe support rod (8) is connected to a scale rod (10) via a transmitting slider (4).

3. The ultrasonic scanning device according to claim 1, characterized in that: The receiving probe (2) is fixed on a receiving probe connection box (12), the receiving probe connection box (12) is fixedly connected to one end of a receiving probe support rod (9) via a receiving probe clamping device (7), and the other end of the receiving probe support rod (9) is connected to a scale rod (10) via a receiving slider (5).

4. The ultrasonic scanning device according to any one of claims 1 to 3, characterized in that: The scale rod (10) is further provided with a groove for mounting a transmitting slider (4) and a receiving slider (5); the transmitting slider (4) and the receiving slider (5) are capable of moving along the groove of the scale rod (10) to drive the transmitting probe (1) and the receiving probe (2) to move, thereby achieving adjustment of the span between the transmitting probe (1) and the receiving probe (2).

5. The ultrasonic scanning device according to any one of claims 1 to 3, characterized in that: The scale rod (10) has a length of 100 to 500 mm and is marked with scales, with the smallest unit scale being 1 mm or 2 mm.

6. The ultrasonic scanning device according to any one of claims 1 to 3, characterized in that: The transmitting probe connection box (11) and the receiving probe connection box (12) are connected to the ultrasonic equipment via cables.

7. The ultrasonic scanning device according to any one of claims 1 to 3, characterized in that: The direction of the transmitting probe connection box (11) is adjustable, and the emission angle can be adjusted by rotating the direction of the transmitting probe connection box (11).

8. The ultrasonic scanning device according to any one of claims 1 to 3, characterized in that: The transmitting probe (1) is internally provided with an ultrasonic transducer for generating a transmitting ultrasonic signal; the transmitting probe connection box (11) is used for signal amplification and filtering.

9. The ultrasonic scanning device according to any one of claims 1 to 3, characterized in that: The receiving probe (2) is internally provided with an ultrasonic wave receiving transducer for receiving ultrasonic wave signals; the receiving probe connecting box (12) is used for transmitting the received ultrasonic wave signals.

10. The ultrasonic scanning device according to any one of claims 1 to 3, characterized in that: The movable device comprises wheels (3), which are used to support the entire ultrasonic scanning device and to roll on the asphalt road surface so that the probe can move along the road surface.

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