Asphalt pavement structure health monitoring method based on intelligent sensing technology

Abstract

The invention discloses an asphalt pavement structure health monitoring method based on an intelligent sensing technology, which comprises the following steps: external pressure on an asphalt pavement acts on a sensor packaging container, and the external pressure is transmitted into the sensor packaging container; the transmitted external pressure and pressure angle information are sensed based on the MEMS pressure sensing assembly; the external pressure and the pressure angle information are wirelessly transmitted to a mobile terminal based on a signal transmission assembly; and monitoring the stress state of the asphalt pavement structure in real time based on the mobile terminal. The stress state of the asphalt pavement structure is monitored through MEMS pressure sensing, the technical problems that in the prior art of asphalt pavement stress strain monitoring, a pressure sensor is large in size, difficult to install and construct, prone to damage and the like are solved, wired data transmission is replaced with wireless Bluetooth signal transmission, the stress state of the asphalt pavement structure can be monitored in real time, and the application range is wide. And the accuracy of measurement results is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent monitoring of asphalt pavement structures in road engineering, and in particular relates to a method for monitoring the health of asphalt pavement structures based on intelligent sensing technology. Background Art

[0002] Asphalt pavement is the most widely used pavement structure in the current highway engineering field. Under the repeated action of road vehicle loads, stress damage will occur inside the asphalt pavement material and continue to accumulate, resulting in damage to the asphalt pavement material, which in turn leads to the destruction of the asphalt pavement. Accurate detection and identification of the stress state inside the asphalt pavement can better study the mechanical behavior of the asphalt pavement, and monitoring the health status of the asphalt pavement provides a scientific basis for the maintenance of the asphalt pavement.

[0003] At present, asphalt pavement condition detection and monitoring are often carried out by large vehicles passing on the road. The detection frequency is low, and it is difficult to perceive changes in road conditions in real time. Therefore, only the diseases that have occurred can be detected, but the process of the disease occurrence cannot be monitored.

[0004] Currently, the stress state inside asphalt pavement is mainly monitored by burying stress strain gauges inside the asphalt pavement. This type of stress strain gauge is large in size, has poor accuracy, is difficult to install and is easy to damage. Its signal transmission is sent via wired transmission, which is costly and has a low sensor survival rate.

[0005] In view of the problems of large size, poor accuracy and inconvenience in using the existing asphalt pavement internal stress state monitoring sensors, it is urgent to propose an asphalt pavement structure health monitoring method based on intelligent sensing technology. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes a method for monitoring the health of asphalt pavement structure based on intelligent sensing technology to solve the problems existing in the above prior art.

[0007] To achieve the above-mentioned object, the present invention provides an asphalt pavement structure health monitoring device based on intelligent sensing technology, comprising: a sensor packaging container, wherein the sensor packaging container has a built-in electrically connected MEMS pressure sensing component, a signal transmission component and a rigid signal processing circuit board;

[0008] The MEMS pressure sensing assembly includes a MEMS pressure sensor and a MEMS tilt sensor, and the MEMS pressure sensor and the MEMS tilt sensor are fixed to the upper surface of the rigid signal processing circuit board and are used to sense the pressure information and angle information of the sensor packaging container;

[0009] The signal transmission component is embedded in the rigid signal processing circuit board and is used to realize wireless transmission of sensor data.

[0010] Optionally, the sensor packaging container further comprises packaging silica gel, and the packaging silica gel comprises circuit board packaging silica gel and silicone oil;

[0011] The circuit board packaging silica gel is used to fix the MEMS pressure sensor, MEMS tilt sensor and signal transmission component on the rigid signal processing circuit board; the silicone oil is used to fill the sensor packaging container.

[0012] Optionally, the MEMS pressure sensor is a silicon piezoresistive pressure sensor;

[0013] The MEMS inclination sensor is a solid pendulum inclination sensor.

[0014] Optionally, the sensor packaging container comprises a bottom plate, a side plate and a top plate; the rigid signal processing circuit board is fixed on the upper surface of the bottom plate, and the side plate and the top plate are fixed on the bottom plate;

[0015] The bottom plate is any one of epoxy glass cloth board material and resin material capable of forming a rigid structure; the side plates and top plate are materials with low elastic modulus, and the materials with low elastic modulus include but are not limited to silicone materials and flexible plastics.

[0016] Optionally, also includes a smart aggregate shell;

[0017] The smart aggregate housing is a packaging housing of the sensor packaging container, and is used to protect the sensor assembly;

[0018] The intelligent aggregate shell adopts a mixed material of a single-component high-temperature resistant epoxy resin glue and quartz sand, and the mass ratio of the single-component high-temperature resistant epoxy resin glue and quartz sand is (2-3:1).

[0019] Optionally, a metallized hole is reserved on the bottom plate of the sensor packaging container;

[0020] A battery installation groove is reserved on the outer surface of the intelligent aggregate shell, and the battery installation groove is connected to the rigid signal processing circuit board through the metallized hole via a power connection line, and is used to power the MEMS pressure sensor, MEMS tilt sensor, signal transmission component and rigid signal processing circuit board by installing a battery.

[0021] Optionally, the battery is a lithium iron phosphate battery.

[0022] Optionally, the smart aggregate shell is prepared by jet printing using a 3D printing device.

[0023] Optionally, the signal transmission component adopts a Bluetooth wireless signal transmission device.

[0024] The present invention also provides an asphalt pavement structure health monitoring method based on intelligent sensing technology, and an asphalt pavement structure health monitoring device based on intelligent sensing technology, comprising the following steps:

[0025] The external pressure on the asphalt road surface acts on the sensor packaging container, and the external pressure is transmitted to the interior of the sensor packaging container;

[0026] External pressure and pressure angle information sensed and transmitted by MEMS pressure sensing components;

[0027] Wirelessly transmitting the external pressure and pressure angle information to a mobile terminal based on a signal transmission component;

[0028] The stress state of the asphalt pavement structure is monitored in real time based on the mobile terminal.

[0029] Compared with the prior art, the present invention has the following advantages and technical effects:

[0030] The present invention provides a method for monitoring the health of asphalt pavement structure based on intelligent sensing technology. The use of MEMS pressure sensing components can overcome the shortcomings of stress strain gauge sensors used in traditional asphalt pavements, such as large size, difficult installation and construction, and easy damage. Wireless Bluetooth signal transmission is used instead of wired data transmission to solve the risks of damage to wired data transmission lines and data transmission obstacles of stress strain gauge sensors. The method can monitor the stress state of the asphalt pavement structure in real time, ensuring the accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0032] Figure 1 A schematic diagram of the structure of a sensor circuit board according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of a sensor packaging container according to an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the intelligent aggregate structure of an embodiment of the present invention;

[0035] Among them: 1. MEMS pressure sensor; 2. MEMS tilt sensor; 3. Signal transmission component; 4. Rigid signal processing circuit board; 5. Sensor packaging container; 51. Bottom plate; 52. Side plate; 53. Top plate; 54. Metallized hole; 6. Encapsulation silicone; 61. Circuit board encapsulation silicone; 62. Silicone oil; 7. Intelligent aggregate housing; 8. Battery mounting slot; 81. Power connection line; 9. Battery. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0038] In this embodiment, a method for monitoring the health of an asphalt pavement structure based on intelligent sensing technology and a device for monitoring the health of an asphalt pavement structure based on intelligent sensing technology are provided. The device comprises: a MEMS pressure sensor 1, a MEMS tilt sensor 2, a signal transmission component 3, a rigid signal processing circuit board 4, a sensor packaging container 5, packaging silica gel 6, an intelligent aggregate housing 7, a battery mounting slot 8 and a battery 9.

[0039] Reference Figure 1 As shown, as a preferred embodiment, the MEMS pressure sensing component adopts a combination module of a MEMS pressure sensor 1 and a MEMS inclination sensor 2, which is fixed on the upper surface of a rigid signal processing circuit board 4, and is used to sense the pressure and angle information of the intelligent aggregate; the signal transmission component 3 adopts a Bluetooth wireless signal transmission device to realize wireless transmission of data, and is embedded in the rigid signal processing circuit board 4, and is used to send the signal of intelligent aggregate monitoring to an external processor; the rigid signal processing circuit board 4 is a circuit board for fixing the MEMS pressure sensing component and the signal transmission component 3; the encapsulation silicone includes a circuit board encapsulation silicone 61 and a cavity filling silicone oil 62, which are used to fix the sensor on the circuit board and transmit pressure.

[0040] The MEMS pressure sensor 1, the MEMS tilt sensor 2, the signal transmission component 3 and the rigid signal processing circuit board 4 are electrically connected through a gold wire binding process; the MEMS pressure sensor 1, the MEMS tilt sensor 2 and the signal transmission component 3 on the rigid signal processing circuit board 4 are fixed with circuit board packaging silicone 61.

[0041] Furthermore, the MEMS pressure sensor 1 is a silicon piezoresistive pressure sensor with a pressure range of 100-2000 kPa and a measurement accuracy of 0.5% FS.

[0042] Furthermore, the MEMS inclination sensor 2 adopts a "solid pendulum" type inclination sensor.

[0043] Furthermore, the information transmission component 3 adopts a Bluetooth wireless signal transmission device with a specification of 4.0BLE and a frequency band of 2.379 to 2.496 GHz.

[0044] Furthermore, the circuit board packaging silicone 61 described in this embodiment uses AB glue to fix the MEMS pressure sensor component and the signal transmission component 3 on the rigid signal processing circuit board 4.

[0045] Reference Figure 2 As shown, as a preferred embodiment, the sensor packaging container 5 is a closed cavity structure with a rigid bottom surface and flexible other surfaces, and has a MEMS pressure sensor component, a signal transmission component 3, a rigid signal processing circuit board 4 and a packaging silicone 6 built in. The pressure generated by the outside world acts on the sensor packaging container 5 to cause the packaging container to deform, compressing the packaging silicone 6 in the closed cavity and thereby causing the MEMS pressure sensor component to be sensed.

[0046] Furthermore, the sensor packaging container 5 is composed of a bottom plate 51, a side plate 52 and a top plate 53 to form a closed cavity structure. The bottom plate 51 is an epoxy glass cloth plate or a resin material that can form a rigid structure, such as ABS resin, etc., and a metallized hole 54 is reserved for an external power supply wire. The rigid signal processing circuit board 4 is fixed to the upper surface of the bottom plate 51 by an adhesive material. The side plates 52 and the top plate 53 are made of a material with a low elastic modulus and are fixed to the bottom plate 51 by an adhesive material, thereby forming a closed cavity structure. The material with a low elastic modulus includes but is not limited to silicone material, flexible plastic, etc. The bonding material includes but is not limited to silicone or resin material, etc. Finally, the closed cavity structure is built with the MEMS pressure sensor 1, MEMS tilt sensor 2, signal transmission component 3, and rigid signal processing circuit board 4, and the closed cavity structure is filled with silicone oil 62.

[0047] Reference Figure 3 As shown, as a preferred embodiment, the intelligent aggregate shell 7 is the encapsulation shell of the sensor encapsulation container 5, which is used to protect the sensor. Preferably, the material of the intelligent aggregate shell 7 is a single-component high-temperature resistant epoxy resin glue (model 6103) + quartz sand, the mass ratio of the two is (2-3): 1, and its elastic modulus after curing is 2-3GPa; the size of the intelligent aggregate shell 7 can be a cube with a standard size such as 20mm×20mm, or a three-dimensional scanning structure of the real aggregate of the asphalt pavement (10mm-20mm file). During the specific production, the real aggregate (10mm-20mm file) and the sensor container 6 can be scanned by a three-dimensional scanner, and the obtained three-dimensional model can be imported into the 3D printing equipment, and the preferred printing material can be used for jet printing.

[0048] Furthermore, a battery mounting groove 8 is provided on the outer surface of the intelligent aggregate housing 7, which is connected to the rigid signal processing circuit board 4 through the power connection line 81 through the metallized hole 54, so as to supply power to the MMEMS pressure sensor 1, the MEMS tilt sensor 2, the signal transmission component 3 and the rigid signal processing circuit board 4, and the power connection line 81 and the metallized hole 54 are sealed and connected by epoxy glue.

[0049] Furthermore, the battery 9 is a lithium iron phosphate battery with a specification parameter of 3V@400mAh, which is used to power the MEMS pressure sensor component and the signal transmission component 3.

[0050] This embodiment also provides an asphalt pavement structure health monitoring method based on intelligent sensing technology, based on an asphalt pavement structure health monitoring device based on intelligent sensing technology, which is pre-buried inside the asphalt pavement structure for real-time monitoring of the stress state of the asphalt pavement structure, providing a scientific basis for the maintenance of the asphalt pavement, and specifically includes the following steps:

[0051] The external pressure on the asphalt pavement acts on the sensor packaging container 5, and the external pressure is transmitted to the inside of the sensor packaging container 5; the external pressure and pressure angle information are sensed and transmitted based on the MEMS pressure sensing component; the external pressure and pressure angle information are wirelessly transmitted to the mobile terminal based on the signal transmission component 3; and the stress state of the asphalt pavement structure is monitored in real time based on the mobile terminal.

[0052] The present invention uses MEMS pressure sensors to monitor the stress state of asphalt pavement structures, overcoming the technical problems of the existing technology for monitoring stress and strain of asphalt pavement, such as large pressure sensors, difficult installation and easy damage;

[0053] The present invention adopts wireless Bluetooth signal transmission instead of wired data transmission, thus overcoming the risk of wired data transmission line damage and data transmission obstacles of asphalt pavement stress strain gauge sensors;

[0054] The present invention uses a 3D printed epoxy resin material of real aggregate to encapsulate the sensor, which has good coupling performance with the asphalt pavement and has no effect on the pavement performance of the asphalt pavement, thereby ensuring the accuracy of the measurement results and being able to monitor the stress state of the asphalt pavement structure in real time.

[0055] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An asphalt pavement structure health monitoring device based on intelligent sensing technology, characterized in that: include: A sensor packaging container (5), wherein the sensor packaging container (5) has a MEMS pressure sensing component, a signal transmission component (3) and a rigid signal processing circuit board (4) electrically connected thereto; The MEMS pressure sensing component comprises a MEMS pressure sensor (1) and a MEMS tilt sensor (2), wherein the MEMS pressure sensor (1) and the MEMS tilt sensor (2) are fixed to the upper surface of the rigid signal processing circuit board (4) and are used to sense pressure information and angle information of the sensor packaging container (5); The signal transmission component (3) is embedded in the rigid signal processing circuit board (4) and is used to realize wireless transmission of sensor data.

2. The asphalt pavement structure health monitoring device based on intelligent sensing technology according to claim 1 is characterized in that: The sensor packaging container further comprises packaging silica gel (6), wherein the packaging silica gel (6) comprises circuit board packaging silica gel (61) and silicone oil (62); The circuit board packaging silica gel (61) is used to fix the MEMS pressure sensor (1), the MEMS tilt sensor (2) and the signal transmission component (3) on the rigid signal processing circuit board (4); and the silicone oil (62) is used to fill the sensor packaging container (5).

3. The asphalt pavement structure health monitoring device based on intelligent sensing technology according to claim 1 is characterized in that: The MEMS pressure sensor (1) is a silicon piezoresistive pressure sensor; The MEMS inclination sensor (2) is a solid pendulum-type inclination sensor.

4. The asphalt pavement structure health monitoring device based on intelligent sensing technology according to claim 1 is characterized in that: The sensor packaging container (5) comprises a bottom plate (51), a side plate (52) and a top plate (53); the rigid signal processing circuit board (4) is fixed on the upper surface of the bottom plate (51), and the side plate (52) and the top plate (53) are fixed on the bottom plate (51); The bottom plate (51) is any one of epoxy glass cloth board material and resin material capable of forming a rigid structure; the side plates (52) and the top plate (53) are materials with low elastic modulus, and the materials with low elastic modulus include but are not limited to silicone materials and flexible plastics.

5. The asphalt pavement structure health monitoring device based on intelligent sensing technology according to claim 1 is characterized in that: Also included is a smart aggregate housing (7); The intelligent aggregate housing (7) is a packaging housing of the sensor packaging container (5) and is used to protect the sensor component; The intelligent aggregate shell (7) is made of a mixed material of a single-component high-temperature resistant epoxy resin glue and quartz sand, and the mass ratio of the single-component high-temperature resistant epoxy resin glue to the quartz sand is (2-3:1).

6. The asphalt pavement structure health monitoring device based on intelligent sensing technology according to claim 5 is characterized in that: A metallized hole (54) is reserved on the bottom plate (51) of the sensor packaging container (5); A battery installation groove (8) is retained on the outer surface of the intelligent aggregate housing (7), and the battery installation groove (8) is connected to the rigid signal processing circuit board (4) through the metallized hole (54) via a power connection line (81), and is used to power the MEMS pressure sensor (1), the MEMS tilt sensor (2), the signal transmission component (3) and the rigid signal processing circuit board (4) by installing a battery (9).

7. The asphalt pavement structure health monitoring device based on intelligent sensing technology according to claim 6 is characterized in that: The battery (9) is a lithium iron phosphate battery.

8. The asphalt pavement structure health monitoring device based on intelligent sensing technology according to claim 5 is characterized in that: The intelligent aggregate shell (7) is prepared by jet printing using 3D printing equipment.

9. The asphalt pavement structure health monitoring device based on intelligent sensing technology according to claim 1 is characterized in that: The signal transmission component (3) adopts a Bluetooth wireless signal transmission device.

10. A method for monitoring the health of asphalt pavement structure based on intelligent sensing technology, characterized in that: The asphalt pavement structure health monitoring device based on intelligent sensing technology according to any one of claims 1 to 9 comprises the following steps: External pressure on the asphalt road surface acts on the sensor packaging container (5), and the external pressure is transmitted to the interior of the sensor packaging container (5); External pressure and pressure angle information sensed and transmitted by MEMS pressure sensing components; Wirelessly transmitting the external pressure and pressure angle information to a mobile terminal based on a signal transmission component (3); The stress state of the asphalt pavement structure is monitored in real time based on the mobile terminal.

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