Device for detecting thickness uniformity of road subbase

Abstract

The utility model belongs to the technical field of road subbase layer detection, and particularly relates to a road subbase layer thickness uniformity detection device which comprises a device box, the device box is of a plastic bottom-cover-free structure, and the section of the bottom edge of the device box is of a wedge-shaped structure; the bottom of the wireless transmitting acceleration sensor is fixed to an acceleration sensor base, the bottom of the acceleration sensor base makes contact with the ground surface, and the top of the wireless transmitting acceleration sensor is fixed to the inner side of one end of the device box through a fixing rod; the free drop hammer assembly is arranged on the inner side of the other end of the device box.

Description

Technical Field

[0001] The utility model belongs to the technical field of road subbase detection, and particularly relates to a detection device for the thickness uniformity of a road subbase. Background Technique

[0002] The subbase is a transitional layer that connects the upper and lower layers. It is located between the base course and the roadbed and plays a transitional role of connecting the upper and lower layers. As a modulus or stiffness transition zone, the subbase can reduce the tensile stress at the bottom surface of the base course, thereby enhancing the durability of the base course structure. Therefore, the thickness of the subbase has strict regulations. According to the "Highway Engineering Quality Inspection and Evaluation Standard", the allowable deviation of the representative value of the thickness of the subbase of expressways and cement-stabilized gravel is -10 mm; the allowable deviation of the qualified value is -25 mm. If the thickness of the subbase is uneven, it will lead to uneven settlement of the road surface structure, seriously affecting the durability of the road.

[0003] Therefore, after the subbase is laid, it is necessary to not only detect the thickness of the water stability but also detect the thickness uniformity. Therefore, we propose a detection device for the thickness uniformity of a road subbase to measure the thickness uniformity of the subbase. Content of the Utility Model

[0004] The purpose of the utility model is to provide a detection device for the thickness uniformity of a road subbase to solve the above problems.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] A detection device for the thickness uniformity of a road subbase includes:

[0007] A device box, the device box is a plastic structure without a bottom cover, and the cross-section of the bottom edge of the device box is a wedge-shaped structure;

[0008] A wireless transmitting acceleration sensor, the bottom of the wireless transmitting acceleration sensor is fixed on an acceleration sensor base, the bottom of the acceleration sensor base is in contact with the ground surface, and the top of the wireless transmitting acceleration sensor is fixed inside one end of the device box through a fixing rod;

[0009] A free-falling hammer assembly, which is arranged inside the other end of the device box.

[0010] Preferably, the free-falling hammer assembly includes an isolation sheet, the isolation sheet is embedded in the top of the device box, a first magnet is arranged above the isolation sheet, and the first magnet is rotatably connected to the device box through a switch rotating shaft;

[0011] A second magnet limiting frame is fixedly connected below the isolation sheet. The second magnet limiting frame is made of plastic. A second magnet slides vertically within the second magnet limiting frame, and the second magnet is magnetically connected to the first magnet.

[0012] Preferably, the first magnet is a semi-circular structure with a radius of R cm.

[0013] Preferably, the isolation sheet is a semi-circular structure with a radius of R + 1 cm, and the isolation sheet is coaxially arranged with the first magnet.

[0014] Preferably, the second magnet is a square structure with a side length of R / 2 cm.

[0015] Preferably, the height of the second magnet limiting frame is the difference between the distance from the bottom of the isolation sheet to the subbase and the distance from the soil surface to the subbase.

[0016] Preferably, the difference between the sum of the length of the fixed rod, the thickness of the wireless transmitting acceleration sensor, and the thickness of the acceleration sensor base and the difference between the distance from the bottom of the isolation sheet to the subbase and the distance from the soil surface to the subbase is 0.5 mm.

[0017] Compared with the prior art, the present utility model has the following advantages and technical effects:

[0018] During use, the entire device is moved to a designated position. The wedge-shaped structure at the bottom edge of the device box facilitates insertion into the subbase, thereby ensuring measurement convenience and improving the stability of the device. It avoids phenomena such as movement and shaking at the contact between the sensor and the ground caused by driving excitation during detection, ensuring the accuracy of device measurement. The drop hammer is released through the free drop hammer assembly to strike the ground, and the generated vibration is received by the wireless transmitting acceleration sensor. The wireless transmitting acceleration sensor is electrically connected to a computer equipped with analysis software to obtain the elastic wave generated by the drop hammer falling, thereby determining whether the thickness and uniformity of the subbase meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0020] Figure 1 It is a schematic structural diagram of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of the device box of the present utility model;

[0022] Figure 3This is the top view of the structure of the present utility model;

[0023] Figure 4 This is the top view of the structure of the free falling hammer assembly of the present utility model;

[0024] Among them, 1. Fixed rod; 2. Wireless transmitting acceleration sensor; 3. Acceleration sensor base; 4. First magnet; 5. Second magnet; 6. Isolation sheet; 7. Switch rotating shaft; 8. Second magnet limiting frame; 9. Device box. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0027] Refer to Figures 1 to 4 , the present utility model discloses a detection device for the thickness uniformity of the road subbase, including:

[0028] Device box 9, the device box 9 is a plastic structure without a bottom cover, and the cross-section of the bottom edge of the device box 9 is a wedge-shaped structure;

[0029] Wireless transmitting acceleration sensor 2, the bottom of the wireless transmitting acceleration sensor 2 is fixed on the acceleration sensor base 3, the bottom of the acceleration sensor base 3 is in contact with the ground surface, and the top of the wireless transmitting acceleration sensor 2 is fixed inside one end of the device box 9 through the fixed rod 1;

[0030] Free falling hammer assembly, arranged inside the other end of the device box 9.

[0031] During use, the whole device is moved to the designated position. The wedge-shaped structure of the bottom edge of the device box 9 is convenient for inserting into the subbase, which can ensure the convenience of measurement, improve the stability of the device, avoid phenomena such as movement and shaking at the joint between the sensor and the ground due to driving excitation during detection, ensure the accuracy of the device measurement, release the falling hammer through the free falling hammer assembly to hammer the ground, and the generated vibration is received by the wireless transmitting acceleration sensor 2. The wireless transmitting acceleration sensor 2 is electrically connected to a computer equipped with analysis software to obtain the elastic wave generated by the falling of the falling hammer, so as to determine whether the thickness and uniformity of the subbase meet the requirements.

[0032] The standard subbase is detected by this device, and the basic frequency f0 of the standard subbase thickness is obtained through the analysis software. Set f0±x for the basic frequency of the standard subbase thickness, where x is the allowable error value. Move the device to the position to be measured, and record the basic frequency of the thickness of the subbase to be measured as f. According to the change of the basic frequency f, analyze and judge the uniformity of the subbase thickness. When f satisfies f0 + x ≥ f ≥ f0 - x, the uniformity of the subbase thickness meets the requirements; otherwise, it does not meet the requirements.

[0033] In a further optimized solution, the free-falling hammer assembly includes an isolation sheet 6. The isolation sheet 6 is embedded and fixed on the top of the device box 9. A first magnet 4 is provided above the isolation sheet 6. The first magnet 4 is rotatably connected to the device box 9 through a switch rotating shaft 7.

[0034] A second magnet limiting frame 8 is fixedly connected below the isolation sheet 6. The second magnet limiting frame 8 is made of plastic. A second magnet 5 slides vertically in the second magnet limiting frame 8. The second magnet 5 is magnetically connected to the first magnet 4.

[0035] During use, the isolation sheet 6 is embedded and fixed on the top of the device box 9. The first magnet 4 is rotatably connected to the top of the device box 9 through the switch rotating shaft 7. The S pole of the second magnet 5 is arranged corresponding to the N pole of the first magnet 4, so that the first magnet 4 and the second magnet 5 are magnetically adsorbed together. A switch knob is axially connected to the top end of the switch rotating shaft 7. Rotate the knob to drive the first magnet 4 to rotate relative to the isolation sheet 6. The first magnet 4 is separated from the isolation sheet 6. At this time, the isolation sheet 6 has no magnetism, and the second magnet limiting frame 8 is also made of plastic. At this time, the second magnet 5 is separated from the first magnet 4 under the limiting action of the second magnet limiting frame 8 and freely falls to the ground surface.

[0036] Through the setting of the second magnet limiting frame 8, it is possible to avoid phenomena such as shaking of the second magnet 5 during falling, and improve the detection accuracy of the device.

[0037] In a further optimized solution, the first magnet 4 is a semi-circular structure with a radius of R cm.

[0038] In a further optimized solution, the isolation sheet 6 is a semi-circular structure with a radius of R + 1 cm, and the isolation sheet 6 is coaxially arranged with the first magnet 4.

[0039] In a further optimized solution, the second magnet 5 is a square structure with a side length of R / 2 cm.

[0040] In a further optimized solution, the height of the second magnet limiting frame 8 is the difference between the distance from the bottom of the isolation sheet 6 to the subbase and the distance from the soil surface to the subbase.

[0041] For a further optimized solution, the difference between the sum of the length of the fixed rod 1, the thickness of the wireless transmission acceleration sensor 2, and the thickness of the acceleration sensor base 3 and the difference between the distance from the bottom of the spacer 6 to the bottom layer and the distance from the soil surface to the bottom layer is 0.5 mm.

[0042] Let the distance from the bottom of the spacer 6 to the bottom layer be c, and the distance from the soil surface to the bottom layer be d.

[0043] The height of the second magnet limiting frame 8 is denoted as m, and m satisfies m = c - d.

[0044] Let the length of the fixed rod 1 be a, and the sum of the thickness of the wireless transmission acceleration sensor 2 and the thickness of the acceleration sensor base 3 be b, which satisfies the formula a + b = c - d + 0.5 mm.

[0045] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0046] The above-described embodiments are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A device for detecting uniformity of thickness of road subbase, characterized in that: include: A device box (9), the device box (9) is a plastic structure without a bottom cover, and the cross-section of the bottom edge of the device box (9) is a wedge-shaped structure; A wireless transmitting acceleration sensor (2), wherein the bottom of the wireless transmitting acceleration sensor (2) is fixed on an acceleration sensor base (3), the bottom of the acceleration sensor base (3) is in contact with the ground surface, and the top of the wireless transmitting acceleration sensor (2) is fixed to the inner side of one end of the device box (9) via a fixing rod (1); A free-falling hammer assembly is arranged on the inner side of the other end of the device box (9).

2. The device for detecting the uniformity of thickness of a road subbase layer according to claim 1, characterized in that: The free-falling hammer assembly comprises an isolation plate (6), the isolation plate (6) is embedded in the top of the device box (9), a first magnet (4) is arranged above the isolation plate (6), and the first magnet (4) is rotatably connected to the device box (9) via a switch shaft (7); A second magnet limiting frame (8) is fixedly connected below the isolation sheet (6); the second magnet limiting frame (8) is a plastic structure; a second magnet (5) is vertically slidable in the second magnet limiting frame (8); the second magnet (5) is magnetically connected to the first magnet (4).

3. The device for detecting the uniformity of thickness of a road subbase layer according to claim 2, characterized in that: The first magnet (4) is a semicircular structure with a radius of Rcm.

4. The device for detecting the uniformity of thickness of a road subbase layer according to claim 3, characterized in that: The isolation plate (6) is a semicircular structure with a radius of R+1 cm, and the isolation plate (6) is coaxially arranged with the first magnet (4).

5. The device for detecting the uniformity of thickness of a road subbase layer according to claim 3, characterized in that: The second magnet (5) is a square structure with a side length of R / 2 cm.

6. The device for detecting the uniformity of thickness of a road subbase layer according to claim 2, characterized in that: The height of the second magnet limiting frame (8) is the difference between the distance from the bottom of the isolation plate (6) to the base layer and the distance from the soil surface to the base layer.

7. The device for detecting the uniformity of thickness of a road subbase layer according to claim 2, characterized in that: The difference between the sum of the length of the fixing rod (1), the thickness of the wireless transmission acceleration sensor (2), and the thickness of the acceleration sensor base (3) and the difference between the distance from the bottom of the isolation plate (6) to the base layer and the distance from the soil surface to the base layer is 0.5 mm.

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