阅读说明：本技术 一种桥梁伸缩缝监测装置 (Bridge expansion joint monitoring devices ) 是由 郑万山 刘怀林 高文军 唐光武 于 2019-10-16 设计创作，主要内容包括：本发明涉及桥梁监测技术领域,具体公开了一种桥梁伸缩缝监测装置,包括,采集模块,用于采集车辆驶过伸缩缝时的声波信号,对声波信号进行增益放大并转换为数字信号；分析模块,包括存储单元和处理单元,存储单元中预存有正常状态频谱；处理单元通过快速傅里叶变换的方法绘制数字信号的待分析频谱,对比待分析频谱与正常状态频谱,判断伸缩缝的状态,并生成状态信息。采用本发明的技术方案能对伸缩缝接合件是否损坏进行监测。(The invention relates to the technical field of bridge monitoring, and particularly discloses a bridge expansion joint monitoring device which comprises an acquisition module, a control module and a display module, wherein the acquisition module is used for acquiring a sound wave signal when a vehicle drives through an expansion joint, performing gain amplification on the sound wave signal and converting the sound wave signal into a digital signal; the analysis module comprises a storage unit and a processing unit, and the normal state frequency spectrum is prestored in the storage unit; the processing unit draws a frequency spectrum to be analyzed of the digital signal by a fast Fourier transform method, compares the frequency spectrum to be analyzed with a normal state frequency spectrum, judges the state of the expansion joint and generates state information. By adopting the technical scheme of the invention, whether the expansion joint connecting piece is damaged or not can be monitored.)

1. A bridge expansion joint monitoring device is characterized by comprising,

the acquisition module is used for acquiring the sound wave signals when the vehicle drives across the expansion joint, performing gain amplification on the sound wave signals and converting the sound wave signals into digital signals;

the analysis module comprises a storage unit and a processing unit, and the normal state frequency spectrum is prestored in the storage unit; the processing unit draws a frequency spectrum to be analyzed of the digital signal by a fast Fourier transform method, compares the frequency spectrum to be analyzed with a normal state frequency spectrum, judges the state of the expansion joint and generates state information.

2. The bridge expansion joint monitoring device of claim 1, wherein: and before the processing unit analyzes and processes the frequency spectrum of the digital signal, the processing unit also performs background noise elimination processing on the digital signal.

3. The bridge expansion joint monitoring device of claim 2, wherein: the acquisition module comprises a microphone, a gain amplifier and an analog-to-digital converter.

4. The bridge expansion joint monitoring device of claim 3, wherein: the microphone is fixed below the bridge expansion joint.

5. The bridge expansion joint monitoring device of claim 1, wherein: the system also comprises a communication module, a remote processing module and a terminal module; the communication module is used for sending the state information to the remote processing module, and the remote processing module processes the state information and then sends the processed state information to the terminal module.

6. The bridge expansion joint monitoring device of claim 5, wherein: the communication module is further used for sending the spectrum to be analyzed to the remote processing module, the terminal module is used for sending actual fault information of the expansion joint to the remote processing module, and the remote processing module is used for matching and storing the spectrum to be analyzed and the actual fault information of the expansion joint.

7. The bridge expansion joint monitoring device of claim 1, wherein: the status information includes normal and abnormal.

8. The bridge expansion joint monitoring device of claim 7, wherein: when the processing unit compares the frequency spectrum to be analyzed with the frequency spectrum in the normal state, if the similarity between the frequency spectrum and the frequency spectrum in the normal state is greater than a preset first similarity threshold value, the state is judged to be normal.

9. The bridge expansion joint monitoring device of claim 4, wherein: the number of the microphones is not less than two.

10. The bridge expansion joint monitoring device of claim 5, wherein: the microphones include a collection microphone and a noise reduction microphone.

Technical Field

The invention relates to the technical field of bridge monitoring, in particular to a bridge expansion joint monitoring device.

Background

In order to meet the requirement of bridge deck deformation, bridge expansion joints are usually provided between two beam ends, between a beam end and an abutment, or at the hinge joint of a bridge. Because the traffic flow, the speed of a vehicle and the load of the vehicle are continuously improved and certain small problems are left in the construction of the bridge, the damage of the bridge expansion joint is very common. After a common expansion joint is damaged, people cannot find the damaged expansion joint in time, if the damaged area is not obvious, people can hardly find the damaged expansion joint even if regular inspection is carried out, the damage of a bridge expansion joint part can cause that a vehicle jolts more and more when running, noise is annoying, the phenomenon of vehicle jumping caused by dendendendendenuded is aggravated, and the safety of the bridge and the service life of the bridge are endangered.

Therefore, chinese patent with publication number CN106840064A discloses a bridge expansion joint displacement monitoring device, there is a first beam slab and a second beam slab on one side of the bridge expansion joint, including the horizontal spring body, a microprocessor, an early warning device, a first pull pressure sensor, a second pull pressure sensor, the laminating sets firmly the first shaped steel at the first beam slab terminal surface, the laminating sets firmly the second shaped steel at the second beam slab terminal surface, the first shaped steel is equipped with a first notch groove, the second shaped steel is equipped with a second notch groove, the first pull pressure sensor is embedded in the first notch groove, the second pull pressure sensor is embedded in the second notch groove, the first pull pressure sensor is connected with the second pull pressure sensor through the spring body, the first pull pressure sensor and the second pull pressure sensor are all electrically connected with the early warning device through the microprocessor.

Above-mentioned scheme can be to the accurate detection of the displacement volume of flexible seam parallel and perpendicular to bridge axis direction, but, when the displacement volume of flexible seam parallel and perpendicular to bridge axis direction did not change and expansion joint fastener part damaged, but can not detect, is unfavorable for the timely maintenance of expansion joint, goes down easily to cause the expansion of damage position for a long time.

Therefore, a device for monitoring whether the expansion joint is damaged is needed.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a bridge expansion joint monitoring device.

The technical scheme of the invention is as follows:

a bridge expansion joint monitoring device comprises a monitoring device,

the acquisition module is used for acquiring the sound wave signals when the vehicle drives across the expansion joint, performing gain amplification on the sound wave signals and converting the sound wave signals into digital signals;

the analysis module comprises a storage unit and a processing unit, and the normal state frequency spectrum is prestored in the storage unit; the processing unit draws a frequency spectrum to be analyzed of the digital signal by a fast Fourier transform method, compares the frequency spectrum to be analyzed with a normal state frequency spectrum, judges the state of the expansion joint and generates state information.

The basic scheme principle and the beneficial effects are as follows:

when the expansion joint parallel or perpendicular to bridge axis's direction takes place the displacement, can lead to the expansion joint to change, when the vehicle drives over the expansion joint that changes, the sound wave signal can be different with under the normal condition. This scheme is through gathering the sound wave signal, monitors the bridge expansion joint, can effectively master the operating condition at expansion joint, differentiates the change situation at expansion joint. Moreover, when the joint part of the expansion joint goes wrong, when the vehicle runs across the expansion joint, the sound wave signals are different from those in normal conditions, and can be found in time, so that the workers can maintain in time, and the running safety of the vehicle and the use safety of the bridge can be guaranteed. And this scheme convenient to use and reliable.

Further, before analyzing and processing the frequency spectrum of the digital signal, the processing unit also performs background noise elimination processing on the digital signal.

By eliminating the background noise processing, the interference of the background noise can be reduced, and the accuracy of judgment is improved.

Further, the acquisition module comprises a microphone, a gain amplifier and an analog-to-digital converter.

The sound wave signals collected by the microphone are amplified through the gain amplifier, so that subsequent comparison is facilitated.

Further, the microphone is fixed below the bridge expansion joint.

The space below the bridge expansion joint is large, the limitation on the installation position is small, and meanwhile, the influence on the running of the vehicle is avoided.

Further, the system also comprises a communication module, a remote processing module and a terminal module; the communication module is used for sending the state information to the remote processing module, and the remote processing module processes the state information and then sends the processed state information to the terminal module.

Through communication module and remote processing module, can in time send the state at bridge expansion joint to staff's terminal module on, when the staff looked at the state at bridge expansion joint through terminal module, can in time judge whether need handle.

Furthermore, the communication module is also used for sending the spectrum to be analyzed to the remote processing module, the terminal module is used for sending actual fault information of the expansion joint to the remote processing module, and the remote processing module matches and stores the spectrum to be analyzed and the actual fault information of the expansion joint.

In consideration of cost and operating environment, the operational capability of the analysis module arranged near the bridge expansion joint is not better than that of the remote processing module, the analysis module can only carry out simple analysis and judgment on the state, but some bridges are far away and may not be in a communication coverage range or cause communication interruption due to natural disasters, the frequency spectrum to be analyzed cannot be directly sent to the remote processing module for processing, only workers go to check the processing result of the analysis module on site, and the simple analysis and judgment of the analysis module is necessary. But in case of good communication coverage, the remote processing module can implement more complex calculations because of the stronger computing power. At the initial stage, when a worker processes a fault on site, the actual fault information known on site is sent to the remote processing module through the terminal module, the remote processing module matches the frequency spectrum to be analyzed with the actual fault information of the expansion joint, the remote processing module runs for a long time, and after a certain data volume is accumulated, the remote processing module can predict the actual fault of the expansion joint in advance by using the matched frequency spectrum to be analyzed and the actual fault information of the expansion joint, so that the worker can make full preparations before arriving at the site.

Further, the status information includes normal and abnormal.

Only normal and abnormal judgment is carried out, the requirement on the performance of the processing unit is low, and the cost can be effectively controlled.

Further, when the processing unit compares the frequency spectrum to be analyzed with the frequency spectrum in the normal state, if the similarity between the frequency spectrum and the frequency spectrum in the normal state is greater than a preset first similarity threshold, the state is judged to be normal.

The judgment is carried out based on the first similarity threshold value, and the judgment speed can be improved.

Further, the number of the microphones is not less than two.

More abundant sound wave signals can be collected conveniently.

Further, the microphones include a collection microphone and a noise reduction microphone.

The noise reduction microphone is arranged to facilitate noise reduction processing.

Drawings

FIG. 1 is a schematic diagram of installation positions of a collecting microphone and a noise reduction microphone according to an embodiment;

fig. 2 is a logic block diagram of a second embodiment of a bridge expansion joint monitoring device.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include:

expansion joint 1, collection microphone 2, noise reduction microphone 3.