Pavement crack detection equipment

Abstract

The utility model relates to the technical field of road engineering, in particular to pavement crack detection equipment. The equipment comprises a processor, a drop weight deflectometer, a bracket, a deflection sensor and a size detector, the support is arranged above a pavement crack in a striding manner, the drop weight deflectometer applies a load to the pavement around the crack, the size detector arranged at the top of the support detects the crack size, and the deflection sensor arranged on the contact surface of the support and the pavement detects the pavement deflection value; the support is formed by connecting hollow pipelines, the processor arranged on the surface of the support is respectively connected with the drop weight deflectometer, the deflection sensor and the size detector, and a connecting line part is hidden in the hollow pipelines of the support. According to the pavement crack evaluation equipment, various parameters of pavement cracks can be conveniently and efficiently collected and detected, subsequent multi-aspect evaluation on the pavement cracks according to the various parameters is facilitated, and the accuracy and reliability of crack evaluation results are guaranteed.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of road engineering technology, and in particular to a road surface crack detection device. Background Art

[0002] Pavement crack detection refers to the detailed parameter detection and collection of cracks on the road surface to determine the severity of the cracks, the impact on road performance and service life, etc., to facilitate the formulation of corresponding repair or maintenance plans, extend the service life of the road, and effectively ensure road traffic safety. The detection process usually involves the observation and measurement of the length, width, depth, number and location of the cracks to reflect the scale and distribution of the cracks. It is also necessary to collect parameters such as the actual bearing capacity of the road surface, road surface materials, and road surface temperature, so as to refer to a variety of influencing factors and more accurately and specifically perform adaptive maintenance on cracks of different severity. At present, the functions of the devices for collecting and detecting various parameters of road cracks are relatively single. The lines are cumbersome and inconvenient to use when the various devices are combined for detection, which is not conducive to combining multiple factors to evaluate the severity of road cracks. Utility Model Content

[0003] The embodiments of the present specification provide a pavement crack detection device, which is intended to solve one or more of the above-mentioned problems and other potential problems.

[0004] In order to achieve the above objectives, the following technical solutions are provided:

[0005] The present specification provides a road surface crack detection device, including a processor, a drop weight deflectometer, a bracket, a deflection sensor and a size detector; the bracket is arranged across the road surface crack, the drop weight deflectometer applies a load to the road surface around the crack, the size detector arranged on the top of the bracket detects the crack size, and the deflection sensor arranged on the contact surface between the bracket and the road surface detects the deflection value of the road surface; the bracket is connected by a hollow pipe, and the processor arranged on the surface of the bracket is respectively connected to the drop weight deflectometer, the deflection sensor and the size detector, and the connection line is partially hidden inside the hollow pipe of the bracket.

[0006] A pavement crack detection device according to an embodiment of the present specification detects pavement cracks and multiple parameters of the surrounding areas, which facilitates evaluation and identification of pavement cracks based on a combination of multiple factors, and then conducts targeted maintenance research on pavement cracks with different degrees of damage. In addition, the connection lines between the various components of the device are simple and neat, easy to use, and the lines are not easily tangled or affected by external interference, thereby ensuring the stability of the connection relationship between the various components.

[0007] In some embodiments, the support includes a top beam, a column and two span beams. When the support is straddled above a crack in a road surface, the two span beams are respectively arranged on both sides of the crack, and the plane formed by the span beams is parallel to the road surface. The top beam is connected to the span beams through the column so that the top beam is located above the plane formed by the span beams; the size detector is arranged on the top beam, and the deflection sensor is arranged between the span beam and the road surface.

[0008] In some embodiments, the connection lines between the processor and the deflection sensor and the size detector are fixed inside the hollow tube of the bracket; the connection lines between the processor and the drop weight deflectometer are partially fixed inside the hollow tube of the bracket, and the rest are exposed to the outside, and the exposed lines can be wound around the storage grooves set on the surface of the bracket.

[0009] In some embodiments, a length mark is provided on the externally exposed connection line, and the bracket is provided with a vertical positioning piece capable of clamping the connection line at the position where the deflection sensor is located.

[0010] In some embodiments, the two span beams are parallel to each other, and both ends are connected by connecting rods.

[0011] In some embodiments, there are at least two deflection sensors, which are respectively arranged on two of the span beams, and the connecting line between the opposite deflection sensors on the two span beams is perpendicular to the direction of the span beams.

[0012] In some embodiments, a height-adjustable bracket foot is provided under the cross beam.

[0013] In some embodiments, a temperature sensor connected to the processor is provided below the bracket foot.

[0014] In some embodiments, the center of the top beam is located on the center line between the two span beams.

[0015] In some embodiments, the size detector and the top beam are connected via a slide rail, so that the size detector can move on the top beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the embodiments of the present specification will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present specification are shown by way of example and not limitation.

[0017] Figure 1 A schematic diagram of the structure of a road crack detection device according to an embodiment of the present specification is shown;

[0018] Figure 2A side view of a vertical positioning member according to an embodiment of the present specification is shown.

[0019] 1-processor, 2-drop weight deflectometer, 31-top beam, 32-column, 33-cross beam, 331-bracket foot, 34-wire hole, 341-vertical positioning piece, 4-deflection sensor, 5-size detector.

[0020] In the various drawings, the same or corresponding reference numerals represent the same or corresponding parts. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present specification will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present specification are shown in the accompanying drawings, it should be understood that the present specification can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present specification more thorough and complete, and to fully convey the scope of the present specification to those skilled in the art.

[0022] The term "including" and its variations used in this document represent open inclusion, that is, "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one other embodiment". Terms such as "upper", "lower", "front", and "rear" indicating placement or positional relationships are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the principles of this specification, and do not indicate or imply that the referred elements must have a specific orientation, be constructed or operate in a specific orientation, and therefore should not be understood as limitations on this specification.

[0023] When cracks occur on asphalt pavement under the influence of various factors such as materials, climate, and pavement structure design, the structural integrity of the pavement is damaged, and the cracks will in turn affect the pavement's ability to transmit temperature stress and traffic loads. Therefore, when evaluating cracks on the pavement, it is necessary to make a comprehensive judgment based on the pavement cracks and various factors around the pavement cracks. The following is a detailed description of a pavement crack detection device that can collect and detect multiple parameters, is easy to use, and has simple wiring in accordance with the embodiments of this specification, in conjunction with the accompanying drawings. Figure 1The schematic diagram of the structure of a road crack detection device according to an embodiment of the specification is shown. The road surface detection device according to the embodiment of the specification includes a processor 1, a drop weight deflectometer 2, a bracket, a deflection sensor 4 and a size detector 5; the bracket is arranged across the road crack, the drop weight deflectometer 2 applies a load to the road surface around the crack, the size detector 5 arranged on the top of the bracket detects the crack size, and the deflection sensor 4 arranged on the contact surface between the bracket and the road surface detects the deflection value of the road surface; the bracket is connected by a hollow pipe, and the processor 1 arranged on the surface of the bracket is respectively connected to the drop weight deflectometer 2, the deflection sensor 4 and the size detector 5, and the connection line is partially hidden inside the hollow pipe of the bracket.

[0024] The drop weight deflectometer 2 is a pulse power deflectometer that can well simulate the load effect of driving on the road. When in use, the drop weight device of the drop weight deflectometer 2 is started by the control command issued by the processor 1, so that a drop weight of a certain weight falls freely from a certain height. The impact force acts on the bearing plate of the drop weight deflectometer 2 and is transmitted to the road surface, causing the road surface around the crack to deflect. The deflection sensor 4 located on the bracket detects the deformation of the surface of the road structure layer and sends the detection result to the processor 1 for processing. A certain length is reserved for the line between the drop weight deflectometer 2 and the bracket. When the bracket is arranged across the crack of the road surface, the drop weight deflectometer 2 can apply impact force at different distances around the crack of the road surface, so that the deflection sensor 4 detects different deformation data of the surface of the road structure layer caused by the simulation of different distance loads.

[0025] The size detector 5 is located at the top of the bracket, and detects the size parameters such as the width and depth of the crack from top to bottom, and sends them to the processor 1 for processing. The size detector 5 is a detection device such as a camera or a radar. The processor 1 integrates the received parameters and evaluates the crack damage based on the parameters. The evaluation process and evaluation criteria are based on existing technologies, for example:

[0026] When there are two deflection sensors 4, which are located at both ends of the crack and 60 cm apart, the drop weight deflectometer 2 and the two deflection sensors 4 are on the same horizontal line, and the drop weight deflectometer 2 is 20 cm away from the closer deflection sensor 4; at this time, when the crack width is less than 3 mm, ALTE is greater than 75%, the pavement crack is slightly destructive; when the crack width is greater than 3 mm, ALTE is greater than 75% and the crack width is less than 3 mm, ALTE is greater than or equal to 50% and less than 75%, the pavement crack is moderately destructive; when ALTE is less than 50%, the pavement crack is severely destructive. Among them, , ALTE represents the pavement crack load transfer coefficient, Indicates the deflection value of the unloaded side road surface. Indicates the deflection value of the road surface at the loading side, and It is detected by the two deflection sensors 4 respectively.

[0027] The processor 1 can be directly arranged on the bracket to facilitate operation and information processing. The connection line between the processor 1 and other components is partially hidden inside the hollow pipe of the bracket. The contact surface between the component arranged on the bracket and the bracket is provided with a through hole for connecting the line, so that while each component detects and collects a variety of pavement crack parameters, the connection lines between the components are firmly fixed and not easy to be tangled, and are not easily disturbed by the external environment.

[0028] Specifically, the connection lines of the processor 1 and the deflection sensor 4 and the size detector 5 are fixed inside the hollow pipe of the bracket; the connection lines of the processor 1 and the drop weight deflectometer 2 are partially fixed inside the hollow pipe of the bracket, and the rest are exposed to the outside. The exposed lines pass through the wire holes 34 provided on the bracket. The wire holes 34 are provided with rubber strips to fix the position of the lines when they pass through, which is not easy to cause pulling, wear and other effects on the circuits hidden inside the hollow pipe, thereby ensuring the stability of the line connection. The exposed lines can also be wrapped around the storage grooves provided on the surface of the bracket to facilitate the storage of redundant lines. The wire holes 34 can be provided on the bottom side of the bracket and at the same height as the line connection point of the drop weight deflectometer 2, so as to facilitate the determination of the distance between the drop weight deflectometer 2 and the bracket according to the length mark, without the need for additional distance detection tools. Furthermore, the wire holes 34 are located on the bottom side of the bracket where the deflection sensor 4 is located, and the wire holes 34 are provided with vertical positioning pieces 341 that can clamp the connection lines, such as Figure 2 The figure shows a side view of the vertical positioning member 341, which is a hollow cylinder. The bottom through hole of the hollow cylinder is opposite to the wire hole 34. The line passes through the wire hole 34 and enters the vertical positioning member 341, so that the passing line is perpendicular to the surface of the bracket where the wire hole 34 is located, which makes it easy to determine the vertical distance between the drop weight deflectometer 2 and the bracket according to the length mark.

[0029] The support comprises a top beam 31, a column 32 and two span beams 33. When the support is straddled above a crack in the road surface, the two span beams 33 are respectively arranged on both sides of the crack, and the plane formed by the span beams 33 is parallel to the road surface. The top beam 31 is connected to the span beams 33 through the column 32, so that the top beam 31 is located above the plane formed by the span beams 33. The size detector 5 is arranged on the top beam 31, and the deflection sensor 4 is arranged between the span beam 33 and the road surface. The two span beams 33 are respectively arranged on both sides of the crack to ensure the stability of the support erection and indirectly ensure the stability of the components arranged on the support.

[0030] The number of the top beams 31 is 1-2, and the size detector 5 can be installed on different top beams 31 according to specific location requirements. The size detector 5 and the top beam 31 are detachably connected, and the two ends of the top beam 31 are respectively connected to the two cross beams 33 through the columns 32. The columns 32 are provided with a telescopic structure to facilitate the adjustment of the height of the top beam 31 to adapt to the size detection of cracks of different sizes, and also to facilitate reducing the occupied volume of the entire bracket when stored.

[0031] The two span beams 33 are parallel to each other, and the two ends are connected by connecting rods, which further increases the stability of the bracket installed on the road surface. The center of the top beam 31 is located on the center line between the two span beams 33. The center of the top beam 31 is aligned with the road surface gap for detection. The positions of the span beams 33 on both sides relative to the gap are relatively symmetrical, and the bracket is more stable when installed. At the same time, the deflection sensor 4 can detect the deflection data at relatively symmetrical positions on both sides of the gap. There are at least two deflection sensors 4, which are respectively arranged on the two span beams 33, and the connecting line between the relative deflection sensors 4 on the two span beams 33 is perpendicular to the direction of the span beam 33, detecting the deflection data at the relative positions on both sides of the crack, which is convenient for the subsequent calculation and processing of the processor 1; the drop weight deflectometer 2 simulates the load on the extension line of the connecting line of the two deflection sensors 4, which further facilitates the processor 1 to process parameters according to the fixed load application direction.

[0032] In addition, the roadside with cracks is not necessarily very flat, and a height-adjustable bracket foot 331 is provided under the cross beam 33; the size detector 5 and the top beam 31 are connected by a slide rail, so that the size detector 5 can move on the top beam 31. Therefore, the height of the bracket can be adjusted by adjusting the height of the bracket foot 331, so that the size detector 5 on the bracket is in a better detection state; the position of the size detector 5 can also be adjusted by connecting the slide rail according to different crack conditions to detect road cracks.

[0033] A temperature sensor connected to the processor 1 is also provided below the bracket foot 331 to detect temperature parameters as a reference for evaluating pavement cracks. For example, the higher the temperature of the asphalt pavement, the lower its bearing capacity.

[0034] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of this specification. Certain features described in the context of separate embodiments may also be implemented in a single implementation in combination. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable sub-combination.

[0035] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0036] The embodiments of the present specification have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A road crack detection device, characterized in that: The invention comprises a processor (1), a drop weight deflectometer (2), a bracket, a deflection sensor (4) and a size detector (5); the bracket is arranged above a crack in a road surface, the drop weight deflectometer (2) applies a load to the road surface around the crack, the size detector (5) arranged on the top of the bracket detects the size of the crack, and the deflection sensor (4) arranged on the contact surface between the bracket and the road surface detects the deflection value of the road surface; the bracket is connected by a hollow pipe, the processor (1) arranged on the surface of the bracket is respectively connected to the drop weight deflectometer (2), the deflection sensor (4) and the size detector (5), and the connection line is partially hidden inside the hollow pipe of the bracket.

2. The device according to claim 1, characterized in that The support comprises a top beam (31), a column (32) and two span beams (33); when the support is arranged above a crack in a road surface, the two span beams (33) are respectively arranged on both sides of the crack, and a plane formed by the span beams (33) is parallel to the road surface; the top beam (31) is connected to the span beams (33) through the column (32), so that the top beam (31) is located above the plane formed by the span beams (33); the size detector (5) is arranged on the top beam (31), and the deflection sensor (4) is arranged between the span beam (33) and the road surface.

3. The device according to claim 2, characterized in that The connection lines between the processor (1) and the deflection sensor (4) and the size detector (5) are fixed inside the hollow pipe of the bracket; the connection lines between the processor (1) and the drop weight deflectometer (2) are partially fixed inside the hollow pipe of the bracket, and the rest is exposed to the outside, and the exposed lines can be wound around a storage groove provided on the surface of the bracket.

4. The device according to claim 3, characterized in that A length mark is provided on the connection line exposed to the outside, and the bracket is provided with a vertical positioning piece (341) capable of clamping the connection line at the position where the deflection sensor (4) is located.

5. The device according to claim 2, characterized in that The two span beams (33) are parallel to each other, and are connected at both ends by connecting rods.

6. The device according to claim 5, characterized in that There are at least two deflection sensors (4), which are respectively arranged on two of the span beams (33), and a connecting line between the deflection sensors (4) on the two span beams (33) that are opposite to each other is perpendicular to the direction of the span beam (33).

7. The device according to claim 5, characterized in that A height-adjustable support foot (331) is provided below the cross beam (33).

8. The device according to claim 7, characterized in that A temperature sensor connected to the processor (1) is provided below the support foot (331).

9. The device according to claim 2, characterized in that The center of the top beam (31) is located on the center line between the two span beams (33).

10. The device according to claim 9, characterized in that The size detector (5) and the top beam (31) are connected via a slide rail, so that the size detector (5) can move on the top beam (31).

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