CN219890489U - Bridge large-volume bearing platform stress and strain detection device - Google Patents
Bridge large-volume bearing platform stress and strain detection device Download PDFInfo
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- CN219890489U CN219890489U CN202321239483.1U CN202321239483U CN219890489U CN 219890489 U CN219890489 U CN 219890489U CN 202321239483 U CN202321239483 U CN 202321239483U CN 219890489 U CN219890489 U CN 219890489U
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
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- 238000007493 shaping process Methods 0.000 claims abstract description 5
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 4
- 238000011161 development Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 12
- 238000005259 measurement Methods 0.000 abstract description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
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- 230000005669 field effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
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Abstract
A bridge large-volume bearing platform stress and strain detection device belongs to the technical field of civil engineering measurement. The method aims to solve the problem of accurate detection of stress and strain of a large-volume bearing platform of the bridge. The stress-strain sensor is connected with an analog electronic switch, the analog electronic switch is respectively connected with an excitation unit, a collection unit and an STM32 microcontroller, the collection unit is connected with a signal processing unit, the excitation unit and the signal processing unit are respectively connected with the STM32 microcontroller, and the STM32 microcontroller is connected with a communication unit; the stress strain sensor is used for measuring the strain quantity in the large-volume bearing platform of the bridge and synchronously measuring the temperature of the buried point; the analog electronic switch is used for realizing the on-off of the device; the excitation unit is used for realizing the sweep frequency work of the stress-strain sensor; the acquisition unit is used for acquiring data detected by the stress-strain sensor; the signal processing unit is used for amplifying, shaping and filtering the signals acquired by the acquisition unit. The utility model has high measurement accuracy.
Description
Technical Field
The utility model belongs to the technical field of civil engineering measurement, and particularly relates to a device for detecting stress and strain of a large-volume bearing platform of a bridge.
Background
The bridge bearing platform large-volume concrete is characterized in that the cementing material releases a large amount of heat in the hydration reaction process, and the heat is accumulated in the concrete and is not easy to be emitted. When the temperature difference between the interior and the surface of the concrete is too large, temperature stress and temperature deformation are generated, the temperature stress is in direct proportion to the temperature difference, and the larger the temperature difference is, the larger the temperature stress is. When the tensile strength of the concrete is insufficient to resist the temperature stress, temperature cracks start to be generated, and the cracks have great harm to the concrete. The main method for collecting the stress of the bridge bearing platform at present is to utilize a vibrating wire type sensor to collect manual data, and an intelligent reader CS-DSY709 is generally adopted to directly read the physical quantity (mu epsilon) of the strain gauge, and meanwhile, the reader stores the serial number, the temperature and the strain value (mu epsilon) of the strain gauge into the reader according to the measurement time. However, this method has many limited problems such as: the integration level of the acquisition instrument is low; the acquisition process is easily interfered by external factors and the like; in data transmission, the transmission of the numerical value is subjected to geographic position; natural environment, limitations of communication methods, and the like.
Disclosure of Invention
The utility model provides a device for detecting the stress and strain of a bridge large-volume bearing platform, which aims to solve the problem of accurately detecting the stress and strain of the bridge large-volume bearing platform.
In order to achieve the above purpose, the present utility model is realized by the following technical scheme:
the device for detecting the stress and strain of the large-volume bearing platform of the bridge comprises a stress-strain sensor, an analog electronic switch, an excitation unit, an acquisition unit, a signal processing unit, an STM32 microcontroller and a communication unit;
the stress-strain sensor is connected with the analog electronic switch, the analog electronic switch is respectively connected with the excitation unit, the acquisition unit and the STM32 microcontroller, the acquisition unit is connected with the signal processing unit, the excitation unit and the signal processing unit are respectively connected with the STM32 microcontroller, and the STM32 microcontroller is connected with the communication unit;
the stress strain sensor is used for measuring the strain quantity in the large-volume bearing platform of the bridge and synchronously measuring the temperature of the buried point;
the analog electronic switch is used for realizing the on-off of the stress and strain detection device of the bridge large-volume bearing platform;
the excitation unit is used for realizing the sweep frequency work of the stress-strain sensor;
the acquisition unit is used for acquiring data detected by the stress-strain sensor;
the signal processing unit is used for amplifying, shaping and filtering the signals acquired by the acquisition unit.
Further, the number of the stress-strain sensors is 16, and the stress-strain sensors are vibrating wire strain gauge sensors.
Further, the STM32 microcontroller is a STM32F103 development board.
Furthermore, the analog electronic switch is an 8-path 5V relay board, a first path and a fourth path of each relay board are connected with a stress strain sensor, a fifth path and an eighth path are connected with a stress strain sensor, and the model of the analog electronic switch is JOC-3FF-S-Z.
Furthermore, the STM32 microcontroller sends a data frame to the serial port according to the RS485 communication protocol, and the serial port converts the TTL level and then sends a signal to the communication unit.
Furthermore, the communication unit adopts LoRa wireless transmission technology.
The beneficial effects of the utility model are as follows:
the bridge large-volume bearing platform stress and strain detection device disclosed by the utility model uses an ARM processor STM32, is externally provided with a corresponding excitation unit, a collection unit and a signal processing unit, and is further combined with a LoRa wireless transmission technology, so that the signal collection and transmission of the vibrating wire type sensor are realized. By adopting the device for detecting the stress and the strain of the large-volume bearing platform of the bridge, the accuracy and the safety meet the regulations of field use, the health condition of the bridge can be effectively mastered, and accidents are avoided.
Drawings
FIG. 1 is a schematic diagram of a device for detecting stress and strain of a large-volume bearing platform of a bridge according to the present utility model;
FIG. 2 is a schematic diagram of an STM32 power supply circuit of a bridge large-volume bearing platform stress and strain detection device according to the present utility model;
FIG. 3 is a circuit diagram of an excitation unit of the bridge large-volume bearing platform stress and strain detection device according to the utility model;
FIG. 4 is a circuit diagram of a signal processing unit of a device for detecting stress and strain of a large-volume bearing platform of a bridge according to the present utility model;
fig. 5 is a diagram showing a connection relationship between a simulated electronic switch and a stress-strain sensor of a bridge large-volume bearing platform stress-strain detection device according to the present utility model.
Detailed Description
Exemplary embodiments of the present utility model will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with system-and business-related constraints, and that these constraints will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
It should be noted here that, in order to avoid obscuring the present utility model due to unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present utility model are shown in the drawings, while other details not greatly related to the present utility model are omitted.
For further understanding of the utility model, the following detailed description is to be taken in conjunction with fig. 1-5, in which the following detailed description is given:
the first embodiment is as follows:
the device for detecting the stress and the strain of the large-volume bearing platform of the bridge comprises a stress-strain sensor 1, an analog electronic switch 2, an excitation unit 3, an acquisition unit 4, a signal processing unit 5, an STM32 microcontroller 6 and a communication unit 7;
the stress-strain sensor 1 is connected with the analog electronic switch 2, the analog electronic switch 2 is respectively connected with the excitation unit 3, the acquisition unit 4 and the STM32 microcontroller 6, the acquisition unit 4 is connected with the signal processing unit 5, the excitation unit and the signal processing unit 5 are respectively connected with the STM32 microcontroller 6, and the STM32 microcontroller 6 is connected with the communication unit 7;
the stress strain sensor 1 is used for measuring the strain capacity in the large-volume bearing platform of the bridge and synchronously measuring the temperature of the buried point;
the analog electronic switch 2 is used for realizing the on-off of the bridge large-volume bearing platform stress and strain detection device;
the excitation unit 3 is used for realizing the sweep frequency work of the stress-strain sensor 1;
the acquisition unit 4 is used for acquiring data detected by the stress-strain sensor 1;
the signal processing unit 5 is used for amplifying, shaping and filtering the signals acquired by the acquisition unit 4.
Further, the number of the stress-strain sensors 1 is 16, and the stress-strain sensors 1 are vibrating wire strain gauge sensors.
Further, the STM32 microcontroller 6 develops a board for STM32F 103.
Furthermore, the analog electronic switch 2 is an 8-path 5V relay board, a first path and a fourth path of each relay board are connected with a stress strain sensor 1, a fifth path and an eighth path are connected with the stress strain sensor 1, and the model of the analog electronic switch 2 is JOC-3FF-S-Z.
Further, the STM32 microcontroller 6 sends a data frame to the serial port according to the RS485 communication protocol, and after the serial port is converted by the TTL level, the signal is sent to the communication unit 7.
Further, the communication unit 7 adopts the LoRa wireless transmission technology.
Furthermore, the bridge large-volume bearing platform stress and strain detection device is externally powered by a lithium battery, and meanwhile, the lithium battery is timely powered by matching with a charge-discharge integrated plate; the charging and discharging integrated plate is a Risym charging and discharging protection integrated plate, and is provided with a DC-DC adjustable boosting and stabilizing power supply module and a 5V high-capacity lithium battery: the positive electrode and the negative electrode of the 5V high-capacity lithium battery are respectively connected with the positive electrode and the negative electrode of the input end of the DC-DC adjustable boosting and stabilizing power supply module, and the output end of the DC-DC adjustable boosting and stabilizing power supply module is calibrated to be 14V; the positive and negative electrodes of the 5V high-capacity lithium battery are connected with the positive and negative electrodes of the Risym charge-discharge protection integrated plate; the USB output end of the Risym charging and discharging protection integrated plate is used for supplying power to the STM32F103 singlechip, and the microUSB end is used for charging a lithium battery.
The working principle of the bridge large-volume bearing platform stress and strain detection device according to the embodiment is as follows: the STM32 microcontroller starts the stress-strain sensor through the excitation unit, the excitation unit causes the diaphragm to vibrate through enabling the steel wire of the stress-strain sensor to vibrate, then the acquisition unit starts to work, discrete sampling is carried out on acquired data, the data are sent to the signal processing unit for filtering and shaping after the sampling is finished, and the processed data are sent to the STM32 microcontroller for frequency calculation. The STM32 microcontroller takes an ARM processor STM32 as a system core, realizes conversion from analog quantity to digital quantity by utilizing an internal A/D conversion function of the STM32, realizes equal-precision measurement of frequency signals by utilizing a counter, a timer and input capture work which are built in the STM32, and outputs sweep frequency pulse signals through an internal timer. The excitation unit uses a CMOSFET field effect transistor to amplify and drive the output signal of the ARM processor. The information conversion and control of the analog electronic switch are realized through an analog switch chip, namely 8 paths of 5V relays, firstly, the input and output information of the stress-strain sensor is converted into discrete signals through a sampling circuit, and then the discrete signals are processed through a signal processing circuit. Finally, through the set high-voltage diode peak detection circuit, the output signal is the amplitude of the envelope signal of the oscillating voltage signal, and then the amplitude of the envelope signal is input into the A/D converter, so that the envelope voltage detection is realized.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the utility model has been described above with reference to specific embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the features of the disclosed embodiments may be combined with each other in any manner so long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification solely for the sake of brevity and resource saving. Therefore, it is intended that the utility model not be limited to the particular embodiments disclosed herein, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. The device for detecting the stress and strain of the large-volume bearing platform of the bridge is characterized by comprising a stress strain sensor (1), an analog electronic switch (2), an excitation unit (3), an acquisition unit (4), a signal processing unit (5), an STM32 microcontroller (6) and a communication unit (7);
the stress-strain sensor (1) is connected with the analog electronic switch (2), the analog electronic switch (2) is respectively connected with the excitation unit (3), the acquisition unit (4) and the STM32 microcontroller (6), the acquisition unit (4) is connected with the signal processing unit (5), the excitation unit and the signal processing unit (5) are respectively connected with the STM32 microcontroller (6), and the STM32 microcontroller (6) is connected with the communication unit (7);
the stress strain sensor (1) is used for measuring the strain quantity in the large-volume bearing platform of the bridge and synchronously measuring the temperature of the buried point;
the analog electronic switch (2) is used for realizing the on-off of the bridge large-volume bearing platform stress and strain detection device;
the excitation unit (3) is used for realizing the sweep frequency work of the stress-strain sensor (1);
the acquisition unit (4) is used for acquiring data detected by the stress-strain sensor (1);
the signal processing unit (5) is used for amplifying, shaping and filtering the signals acquired by the acquisition unit (4).
2. The bridge high-volume bearing platform stress and strain detection device according to claim 1, wherein the number of the stress strain sensors (1) is 16, and the stress strain sensors (1) are vibrating wire strain gauge sensors.
3. The bridge high-volume cap stress and strain detection device according to claim 2, wherein the STM32 microcontroller (6) is an STM32F103 development board.
4. The bridge high-volume bearing platform stress and strain detection device according to claim 3, wherein the analog electronic switch (2) is an 8-path 5V relay board, a first path-a fourth path of each relay board is connected with a stress strain sensor (1), a fifth path-an eighth path of each relay board is connected with a stress strain sensor (1), and the model of the analog electronic switch (2) is JOC-3FF-S-Z.
5. The bridge high-volume bearing platform stress and strain detection device according to claim 4, wherein the STM32 microcontroller (6) sends data frames to the serial port according to an RS485 communication protocol, and the serial port sends signals to the communication unit (7) after being converted by TTL level.
6. The bridge high-volume bearing platform stress and strain detection device according to claim 5, wherein the communication unit (7) adopts LoRa wireless transmission technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321239483.1U CN219890489U (en) | 2023-05-22 | 2023-05-22 | Bridge large-volume bearing platform stress and strain detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321239483.1U CN219890489U (en) | 2023-05-22 | 2023-05-22 | Bridge large-volume bearing platform stress and strain detection device |
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| CN219890489U true CN219890489U (en) | 2023-10-24 |
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| CN202321239483.1U Active CN219890489U (en) | 2023-05-22 | 2023-05-22 | Bridge large-volume bearing platform stress and strain detection device |
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| Country | Link |
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| CN (1) | CN219890489U (en) |
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2023
- 2023-05-22 CN CN202321239483.1U patent/CN219890489U/en active Active
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