CN218297537U - Chain type laser deflection detection system for bridge - Google Patents
Chain type laser deflection detection system for bridge Download PDFInfo
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Abstract
The utility model discloses a chain laser deflection detection system for a bridge, which comprises a reference station, n monitoring stations and a calibration station; the reference station is arranged at one end of the bridge and used for emitting light spots, acquiring monitoring data of the n monitoring stations and transmitting the monitoring data to the upper computer; the monitoring stations are sequentially arranged at the points to be monitored of the bridge, and the displacement and the angle change value of the light spot of the reference station relative to the monitoring stations are calculated; and the calibration station is arranged at the other end of the bridge and used for eliminating the accumulated error of the system and sending the monitoring data of the n monitoring stations to the reference station. The utility model discloses broken the restraint that needs in the traditional approach with laser emission system auto leveling, through setting up the monitoring station treating the monitoring point to model through measuring facula displacement and angle change calculates the deflection value of this point, has realized the synchronous real-time supervision of bridge amount of deflection multiple spot. Meanwhile, errors of various monitoring systems are considered for correction, and detection precision is improved.
Description
Technical Field
The utility model relates to a bridge amount of deflection detects technical field, in particular to chain laser amount of deflection detecting system for bridge.
Background
With the rapid development of national economy and the acceleration of urbanization process, domestic infrastructure and traffic network engineering thereof are increasing day by day. As the service time of the bridge is prolonged, most of the infrastructure in China enters a maintenance stage. However, in the long-term service process of the bridge, along with the great increase of traffic volume, the bridge is affected by human factors and natural disasters, so that the bridge structure is damaged in different degrees, even the bridge body is deformed, and the safety condition of the bridge is greatly affected.
The traditional bridge monitoring is usually carried out by maintenance personnel regularly and independently, and the regular monitoring only can record the current safety condition of the bridge and cannot implement uninterrupted monitoring on the bridge. Secondly, each monitoring can cause transportation discontinuity, and the bridge state cannot be reflected in real time. And finally, the influence of traditional monitoring equipment is received, and manual monitoring only can monitor a local area of the bridge and lacks overall monitoring data. The traditional bridge structure monitoring method has a lot of defects, and the consumption of manpower and material resources is huge, so that a lot of troubles and inconvenience are brought to managers.
The existing bridge deflection monitoring method and equipment are applied to actual engineering and can be generally divided into two types: a manual monitoring method and an automatic monitoring method. The method for manually monitoring the bridge deflection generally has the advantages of high measurement precision, relatively simple installation operation and the like, but after the equipment is installed, the later-stage data all depend on manual reading, so that the method is low in applicability, and wastes time and labor. The existing automatic monitoring method has the defects of low detection precision, incapability of realizing real-time dynamic detection of deflection, short measurement distance and the like.
SUMMERY OF THE UTILITY MODEL
To bridge amount of deflection detection distance short technical problem among the prior art, the utility model provides a chain laser amount of deflection detecting system for bridge through combining chain laser network structure and image visual detection method, gathers, calculates the processing to the amount of deflection value of each monitoring point automatically, and is solved data transmission to the server through remote monitoring module at last, to data in the server, has characteristics such as precision height, real-time good, data visualization good.
In order to achieve the above object, the present invention provides the following technical solutions:
a chain type laser deflection detection system for a bridge comprises a reference station, n monitoring stations and a calibration station;
the reference station is arranged at one end of the bridge and used for emitting light spots, acquiring monitoring data of the n monitoring stations and transmitting the monitoring data to the upper computer;
the monitoring stations are sequentially arranged at points to be monitored of the bridge, and the displacement and angle change values of the light spots of the reference station relative to the monitoring stations are calculated;
and the calibration station is arranged at the other end of the bridge and used for eliminating the accumulated error of the system and sending the monitoring data of the n monitoring stations to the reference station.
Preferably, the bending and bending monitoring system further comprises an upper computer, wherein the upper computer is in wireless connection with the reference station through a DTU module and is used for obtaining a bending value according to monitoring data.
Preferably, the reference station comprises a first laser emission module, a first time synchronization module, a first communication module and a first processing module;
after the first processing module receives the instruction of the upper computer, the first time synchronization module performs time synchronization with the monitoring station and the calibration station, and simultaneously controls the first laser emission module to emit laser spots, and then the first communication module uploads monitoring data of each monitoring station, which is sent by the calibration station, to the upper computer.
Preferably, the first communication module is a direct-insert type LoRa module with the model number of E22-400T30D.
Preferably, the monitoring station comprises a first light spot image measuring sub-module, a control module, a second laser emitting module, a second time synchronization module, an angle measuring module and a second communication module;
the first light spot image measuring submodule is used for receiving the light spots of the reference station or the previous monitoring station and calculating by the control module to obtain the light spot displacement;
the angle measuring module is used for measuring the angle variation of the monitoring station;
the second laser emission module is used for sending the received light spot to the next monitoring station;
the second communication module is used for sending the light spot displacement and the angle variation to the next monitoring station;
and the second time synchronization module is used for carrying out time synchronization with the reference station and the calibration station.
Preferably, the specific structure of the monitoring station is as follows:
a light inlet (2) is formed in the first side wall of the box body (1), and a light outlet (3) is formed in the opposite second side wall; the first light spot image measuring submodule (4) is fixed on a support inside the box body (1); the reflecting mirror surface (5) is fixedly arranged between the light inlet (2) and the light outlet (3), and the angle between the reflecting mirror surface and the first side wall is beta; the distance between the first light spot image measuring submodule (4) and the reflector surface (5) is d;
the second laser emission module (6) is arranged right behind the reflecting mirror surface (5) and close to the light outlet (3); the angle measuring module (7) is fixed at the bottom of the box body (1).
Preferably, the bottom of the box body (1) is provided with a lead hole (9) and a column mounting hole (8), a power line and an antenna pass through the lead hole (9), and the box body (1) is fixed at a point to be monitored through the column mounting hole (8).
To sum up, owing to adopted above-mentioned technical scheme, compare with prior art, the utility model discloses following beneficial effect has at least:
the utility model discloses broken the restraint that needs in the traditional approach with laser emission system auto leveling, through treating that the monitoring point sets up the monitoring station to model through measuring facula displacement and angle change calculates the deflection value of this point, has solved among the actual engineering measuring equipment mounted position itself and has had this measuring difficult problem of displacement and slope, has realized the synchronous real-time supervision of bridge deflection multiple spot.
Meanwhile, errors of various monitoring systems are considered for correction, and detection precision is improved.
Description of the drawings:
fig. 1 is a schematic view of a chain laser deflection detection system for a bridge according to an exemplary embodiment of the present invention.
Fig. 2 is a schematic structural view of a monitoring station according to an exemplary embodiment of the present invention.
Fig. 3 is a schematic view of a bottom structure of a monitoring station according to an exemplary embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and specific embodiments. However, it should not be understood that the scope of the above subject matter is limited to the following embodiments, and all the technologies realized based on the content of the present invention are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the utility model provides a chain laser deflection detection system for bridge, which comprises a reference station, n monitoring stations, a calibration station and an upper computer;
the reference station is arranged at one end of the bridge and used for sending light spots to the monitoring stations, simultaneously acquiring monitoring data of the n monitoring stations and transmitting the monitoring data to the upper computer for deflection calculation;
the monitoring stations comprise n monitoring stations which are sequentially arranged at the points to be monitored of the bridge, and the displacement and angle change value of the light spot of the reference station relative to the monitoring stations are calculated.
And the calibration station is arranged at the other end of the bridge and used for eliminating the accumulated error of the system and sending the monitoring data of the n monitoring stations to the reference station.
The upper computer is in wireless connection with the reference station through the 4G DTU module and is used for storing and processing the detection data to obtain deflection, a user can log in through a Web webpage to check real-time dynamic display of deflection of each monitoring point of the bridge, the deflection information can also be inquired through a mobile APP, and the user can also check historical monitoring data of beam deflection and the like.
In this embodiment, the set points of the reference station and the calibration station are not changed by default, that is, relative displacement does not occur between the two, and the height difference is a fixed value, so that the set points can be used as error compensation.
In this embodiment, the reference station includes a first laser emitting module, a first time synchronization module, a first communication module, and a first processing module.
After the first processing module receives the instruction of the upper computer, the first time synchronization module performs time synchronization with the monitoring station and the calibration station, and simultaneously controls the first laser emission module to emit laser spots, and then the first communication module uploads monitoring data of each monitoring station sent by the calibration station to the upper computer for deflection calculation.
The first communication module selects a direct-insert LoRa module E22-400T30D to realize the ordered transmission of data between the reference station and the monitoring stations, and when a measurement command is sent, each monitoring station can receive the data frame and simultaneously open the laser emission module and collect data. When the reference station collects data, a collection command with a data number can be sent, the serial number of each monitoring station can be defined during design, the monitoring stations upload collected data in sequence when the serial numbers are consistent, otherwise, the data are discarded without any processing, next receiving and judgment are waited, and the system finally selects the transparent transmission mode to transmit the data.
In this embodiment, since the n monitoring stations have the same configuration, any one monitoring station will be described.
The monitoring station comprises a first light spot image measuring submodule, a control module, a second laser emission module, a second time synchronization module, an angle measuring module and a second communication module.
The first light spot image measuring submodule adopts a CMOS camera and is used for receiving the light spot of a reference station or a previous monitoring station and calculating by a control module to obtain the light spot displacement;
compared with a CCD, the CMOS camera has lower power consumption which is about one tenth of the power consumption of the CCD, lower cost and higher integration level, and the model is MT9V034. Before the CMOS camera starts to collect images, related register configuration is firstly carried out, and the CMOS camera is integrated with I 2 C interface, control module passes through I 2 And the two signal lines of the C interface configure the internal register of the camera to wait for the arrival of image data. The module needs to receive the line data and the frame data, and the blanking data is abandoned in the receiving process.
A high-performance processor TMS320C6748 of a TI company is selected as a control module, the processor has multiple peripheral interfaces, rich matching resources and high cost performance, and the design requirements of the whole system are met.
And the angle measuring module is used for measuring angle data of the monitoring station.
The angle measurement module can adopt a high-precision inclination angle sensor MQJD15-485-A of Milan technical company. The MODBUS-RTU protocol is uniformly used during transmission, and one frame of data comprises an address code, a function code, a plurality of data bits and CRC16 check bits. The timer and the interrupt are matched to operate when the inclination angle data is collected: firstly, starting a timer, setting the time as the total time for transmitting 10 characters, and restarting timing every time when new data arrives after the timing is started; after acquiring a frame of data, judging whether an address code, a function code and a CRC check code are correct, if the data are correct, extracting data bits, and solving final inclination data according to a designed conversion relation; if the data is incorrect, the frame data will be discarded to continue waiting for the next arrival of data.
The second laser emission module is used for sending the received light spot to the next monitoring station;
the second communication module is used for sending the light spot displacement and the angle change value to the next monitoring station;
and the second time synchronization module is used for carrying out time synchronization with the first time synchronization module in the reference station.
In this embodiment, the specific structure of the monitoring station is as shown in fig. 2:
the box body 1 is a cuboid, a light inlet 2 is formed in a first side wall, and a light outlet 3 is formed in an opposite second side wall; the first light spot image measuring submodule 4 is fixed on a support inside the box body 1, and the bottom of the support can move back and forth to realize position fine adjustment; the reflecting mirror surface 5 is fixedly arranged between the light inlet 2 and the light outlet 3 (can be fixed by a screw 51) to receive light spots of the light inlet 2, the angle between the light spots and the first side wall is beta, and the angle can be set to 45 degrees; the distance between the first light spot image measuring submodule 4 and the reflector surface 5 is d, preferably 189.5mm; the second laser emission module 6 is arranged right behind the reflector 5 and close to the light outlet 3; the angle measuring module 7 is fixed at the bottom of the box body 1, and is uniformly set in the direction that the clockwise rotation angle changes a positive number and the anticlockwise rotation angle changes a negative number.
The second communication module is arranged at the top of the box body 1, so that signal transmission is facilitated; the second time synchronization module and the control module are both fixedly installed inside the box body 1.
As shown in fig. 3, a lead hole 9 and a column mounting hole 8 (which may be square, and the side length is 150 mm) are reserved at the bottom of the box body 1, a power line and an antenna pass through the lead hole 9, and the box body 1 is fixed at a point to be monitored on the bridge floor through the column mounting hole 8.
In this embodiment, the size of the reflector 5 is 300mm × 192mm, which can meet the requirement of the large-span bridge deflection range. The light-reflecting mirror surface is made of a diffusion transmission optical material, and laser irradiation on the light-reflecting mirror surface has a good diffusion effect, so that clear and reliable circular light spots are formed. Adjusting camera focus, until the camera can shoot clear facula image, it is fixed with the protecting cover installation at last.
In this embodiment, the calibration station includes a second light spot image measurement sub-module, a third time synchronization module, and a third communication module.
The second light spot image measuring submodule is used for receiving the light spot of the previous monitoring station and measuring to obtain the light spot displacement;
the third time synchronization module is used for carrying out time synchronization with the first time synchronization module in the reference station and the second time synchronization module of the monitoring station;
and the third communication module is used for sending the spot displacement and the angle change value which are received by the n monitoring stations to the reference station.
In the embodiment, clean and environment-friendly photovoltaic solar energy is adopted to supply power to equipment in the reference station, the monitoring station and the calibration station, firstly, the solar energy is converted into electric energy to be stored in a lithium battery, and the voltage is about 9-18V. And then designing a corresponding voltage conversion circuit to supply power to the modules according to the power supply requirement of each module.
Based on the above system, the utility model also provides a chain laser amount of deflection detection method for bridge, including following step:
s1: and installing a reference station, a monitoring station and a calibration station on the bridge.
In this embodiment, the reference station is arranged at one end of the bridge; the monitoring stations are sequentially arranged at points to be monitored of the bridge; the calibration station is arranged at the other end of the bridge.
Powering on all equipment in the reference station, the monitoring station and the calibration station for resetting, and setting the initial states of the first laser emission module and the second laser emission module to be closed;
s2: the upper computer sends a measurement command at regular time according to set time and transmits the measurement command to the reference station through the DTU module; the reference station transmits the measurement command to each monitoring station, and the first laser emission module and the second laser emission module start to work.
In this embodiment, when the reference station forwards the measurement command, each monitoring station can receive the data frame, and simultaneously turn on the laser and collect data.
In this embodiment, the first time synchronization module in the reference station, the second time synchronization module in the monitoring station, and the third time synchronization module in the calibration station perform time synchronization to ensure that the light spot image and the angle data are acquired simultaneously.
S3: and each monitoring station analyzes and processes the acquired light spot image to obtain the light spot displacement.
In this embodiment, after acquiring the light spot image, preprocessing is required:
firstly, reducing the size of an image by using a Gaussian pyramid algorithm, and reducing the calculated amount of a subsequent algorithm; and then positioning an ROI in the reduced spot image, mapping the ROI area into an original image, filtering and binarizing the ROI area of the original image, and finally solving the spot center coordinates by using an ellipse fitting algorithm based on a minimum binary principle.
In this embodiment, the first light spot image measurement submodule of the monitoring station shoots the light spot in the image and can generate displacement, and the main factors include: the accumulated displacement of the previous monitoring station, the displacement caused by the pitch angle of the previous laser emission module and the actual displacement of the current monitoring station are calculated according to the spot displacement calculation model:
in the formula (1), the reaction mixture is,
representing the pixel displacement of the spot acquired by the i-spot image measurement submodules, C i Measuring a sub-module for the ith spot image, T i For the ith laser emissionA module;
is the ratio of the pixel displacement to the actual displacement; d is the distance between two adjacent monitoring stations;
the pitch angle variation quantity generated by the ith laser emission module is larger than or equal to 1 and smaller than or equal to n, and n is the total number of the monitoring stations;
indicating the absolute displacement of the ith laser emitting module;
and the absolute displacement of the ith spot image measuring submodule is shown.
And unfolding the light spot displacement calculation model to obtain:
in the actual large-span bridge deflection measurement, the variation of the camera optical axis pitch angle is not more than 1 degree at most, and the variation is only related to the pixel displacement of the facula and is unrelated to the measurement distance, and the influence on the finally calculated deflection value is small, so that cos theta is always considered to be approximately equal to 1 in the model, and the formula (2) can be simplified to be (3):
the spot displacement calculation model is expressed in a matrix form as:
in the formula (4), H represents a spot displacement matrix, which is an n × 1 matrix, H n Representing the nth spot displacement; a represents a pixelThe proportional matrix of the displacement and the actual displacement is a matrix of n x (n + 1), and k represents the proportion of the pixel displacement to the actual displacement; y represents an absolute displacement amount, i.e., an actual deflection amount, and is a matrix of (n + 1) × 1, Y n Representing the absolute displacement of the y-th monitoring station; b denotes the inclination of the monitoring station, is a matrix of n x1, theta n Representing the angle variation of the nth monitoring station; d is the distance between two adjacent levels of monitoring stations.
S4: and the reference station acquires the light spot displacement and the angle variation of each monitoring station and uploads the light spot displacement and the angle variation to the upper computer for deflection calculation.
In this embodiment, the acquisition of the angle variation requires the cooperation of the timer and the interrupt:
firstly, starting a timer, setting the time as the total time for transmitting 10 characters, and restarting timing every time when new data arrives after the timing is started; after collecting a frame of data, judging whether the address code, the function code and the CRC check code are correct, if so, extracting data bits, and calculating the final angle variation according to the designed conversion relation; if the data is incorrect, the frame data will be discarded and continue to wait for the next arrival of data.
When the reference station collects data, a collection command with a data number is sent, the serial number of each monitoring station is defined during design, the collected data are uploaded by the monitoring stations in sequence when the serial numbers are consistent, otherwise, the data are discarded without any processing, next receiving and judgment are waited, and the system finally selects the transparent transmission mode to transmit the data.
The protocol for transmitting data is set according to actual requirements, and the format of command data sent by the reference station to the monitoring station is as follows: begin with "+", "#" ends; the data format returned by the monitoring station to the reference station is as follows: begin with "@" and end with "#". For example: the reference station sends a character string S # to the monitoring station, which indicates that all equipment lights up laser, collects displacement and angle data and stores the displacement and angle data in a variable; the reference station sends a character string 'R #' to the monitoring station, and the reference station takes the current horizontal and vertical displacement data as difference value calculation reference and stores the difference value into an EEROM; the reference station sends a character string ". Times.11 #" to the monitoring station, and then the monitoring station No. 11 returns displacement, angle and difference data stored in the variable to the reference station; if the difference reference is not defined, the horizontal and vertical difference data x and y are 0; the monitoring station returns data "@11a0.004x480.248y240.668n100x1.111y1.111c200.0v200.0#" to the reference station, which in turn means: @ slave machine number, angle difference A, X current light spot horizontal coordinate, Y current light spot vertical coordinate, N measurement count, X horizontal difference, Y vertical difference, C horizontal reference, V vertical reference, and # end.
After all monitoring stations pass through loRa module with data transfer to the reference station, the reference station can be according to the instruction of sending with data through remote monitoring module upload to the server and prepare for follow-up solution. D561 The DTU module adopts full transparent data transmission, realizes wireless remote through a networking communication mode, and selects an RS485 mode to connect the DTU module with the processor.
The process of uploading the data of the reference station to the upper computer is as follows:
firstly, the DTU module needs to set the IP address, the port number and the working mode of the server on a special configuration tool, and the module can be automatically connected with the TCP port when entering a connection mode. AT this time, an AT command may be sent to the module to query the status of data returned by the DTU, and if the returned data is correct, the module enters the next stage, otherwise, the connection mode is resumed. When the module enters a server connection mode, the module sends a judgment instruction to the server, and if the server receives and gives a correct reply to indicate that the connection between the reference station and the upper computer is normal, the reference station continues to enter a data acquisition mode. And entering a data sending mode after the data acquisition is successful, starting to judge whether the upper computer is normally connected, and if the data is connected without errors, uploading the data normally, otherwise, rechecking whether the reference station and the upper computer are successfully connected.
S5: and the upper computer calculates the deflection of the bridge according to the collected facula displacement and the angle variation.
In this embodiment, since the displacement of the reference station is 0, y 0 =0, so (4) changes to:
H'＝A'·Y'+k·d·B (5)
in formula (5), H' = H, which is a matrix of n × 1; a 'is the 2 nd to n +1 th columns of the A matrix, namely A' is the matrix of n multiplied by n; y 'is taken from the 2 nd row to the n +1 th row of the Y matrix, namely Y' is a matrix of n multiplied by 1; the other parameters are unchanged.
Solving equation (5) with linear least squares method can obtain:
Y'＝(A') -1 (H'-k·d·B) (6)。
in the embodiment, when the displacement information is transmitted by the multi-stage monitoring station, the displacement measurement errors at all stages can be correspondingly accumulated, and when the errors are accumulated to a certain value, the accuracy requirement of deflection deformation measurement is not met any more.
Therefore, in order to correct system errors and improve measurement precision, the introduced error is delta h i (assigned automatically by weight according to the distance of each monitoring station) the matrix takes the form of Δ H. H' represents a spot displacement calculation model without error compensation, H 0 Representing the actual spot displacement calculation model after error compensation, then:
H 0 ＝H'+ΔH (7)
substituting equation (7) into equation (4) calculates the absolute displacement error at each monitoring station as:
ΔY＝A -1 ·ΔH (8)
wherein,
because the accumulated error in the system can be eliminated by the closed networking measurement route, the error compensation measure is adopted, the primary monitoring points are added, and the number of the monitoring stations is n + 1. The first-stage and the last-stage intelligent receiving targets are arranged in the area outside the bridge, the first stage is used as a reference point, and the last stage is used for adjustment. There is no relative displacement between the two stages so their difference in height is a fixed value. The head and tail reference points and a plurality of monitoring stations in the middle form a closed deflection monitoring network,
in the embodiment, the deflection values of the monitoring stations obtained through calculation are displayed on the display screen in real time, deflection information can be inquired through the mobile APP, and a user can also view historical beam deflection monitoring data and the like.
An example of an error accumulation solution is as follows:
the set parameters comprise 1 reference station and 7 monitoring stations, two adjacent monitoring stations are d =10000mm, the amplification factor k =1 of the laser spot image, and the parameters of the monitoring model are changed into:
from the derivation:
Y'＝(A') -1 (H'-1·10000·B)
wherein
In practical application, the angle values of 7 adjacent monitoring stations and the relative displacement of the monitoring stations can be directly measured. Therefore, a group of angle values and the relative displacement of each adjacent monitoring point are given during simulation, and the parameter values of the matrixes B and H' can be determined. The absolute displacement true values of 7 monitoring stations can be obtained by the above formula.
After adding error compensation, the conditions were set as follows: a level 1 reference station, a level 7 monitoring station and a level 1 calibration station. Two adjacent monitoring stations are set to d =10000mm, k =1, y 0 ＝0，θ 8 =0, while adding the above constraint:
after substituting the known parameters, the monitoring model is:
then it is possible to obtain:
Y'＝(A') -1 (H'-1·10000·B)
wherein
And setting a group of angle values and relative displacement of each adjacent monitoring point which are the same as those in the model without the error compensation device, namely determining matrixes B and H'. And obtaining the deflection value of the 7-level monitoring station on the bridge through the calculation.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (7)
1. A chain type laser deflection detection system for a bridge is characterized by comprising a reference station, n monitoring stations and a calibration station;
the reference station is arranged at one end of the bridge and used for emitting light spots, acquiring monitoring data of the n monitoring stations and transmitting the monitoring data to the upper computer;
the monitoring stations are sequentially arranged at points to be monitored of the bridge, and the displacement and angle change values of the light spots of the reference station relative to the monitoring stations are calculated;
and the calibration station is arranged at the other end of the bridge and used for eliminating accumulated errors of the system and sending the monitoring data of the n monitoring stations to the reference station.
2. The chain type laser deflection detection system for the bridge of claim 1, further comprising an upper computer, wherein the upper computer is in wireless connection with the reference station through a DTU module and is used for obtaining the deflection value according to the monitoring data.
3. The chain laser deflection detection system for a bridge of claim 1, wherein the reference station comprises a first laser emitting module, a first time synchronization module, a first communication module and a first processing module;
after the first processing module receives the instruction of the upper computer, the first time synchronization module performs time synchronization with the monitoring station and the calibration station, and controls the first laser emission module to emit laser spots at the same time, and then the first communication module uploads monitoring data of each monitoring station, which is sent by the calibration station, to the upper computer.
4. The system for detecting chain laser deflection for a bridge of claim 3, wherein the first communication module is an in-line type LoRa module with a model number of E22-400T30D.
5. The chain type laser deflection detection system for the bridge of claim 1, wherein the monitoring station comprises a first light spot image measuring sub-module, a control module, a second laser emitting module, a second time synchronization module, an angle measuring module and a second communication module;
the first light spot image measuring submodule is used for receiving the light spots of the reference station or the previous monitoring station and calculating by the control module to obtain the light spot displacement;
the angle measuring module is used for measuring the angle variation of the monitoring station;
the second laser emission module is used for sending the received light spot to the next monitoring station;
the second communication module is used for sending the light spot displacement and the angle variation to the next monitoring station;
and the second time synchronization module is used for carrying out time synchronization with the reference station and the calibration station.
6. The chain type laser deflection detection system for the bridge of claim 5, wherein the concrete structure of the monitoring station is as follows:
a first side wall of the box body (1) is provided with a light inlet (2), and an opposite second side wall is provided with a light outlet (3); the first light spot image measuring submodule (4) is fixed on a support inside the box body (1); the reflecting mirror surface (5) is fixedly arranged between the light inlet (2) and the light outlet (3), and the angle between the reflecting mirror surface and the first side wall is beta; the distance between the first light spot image measuring submodule (4) and the reflector surface (5) is d;
the second laser emission module (6) is arranged right behind the reflecting mirror surface (5) and close to the light outlet (3); the angle measuring module (7) is fixed at the bottom of the box body (1).
7. The chain type laser deflection detection system for the bridge girder according to claim 6, wherein the bottom of the box body (1) is provided with a lead hole (9) and a column mounting hole (8), a power line and an antenna pass through the lead hole (9), and the box body (1) is fixed at a point to be monitored through the column mounting hole (8).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117053718A (en) * | 2023-10-11 | 2023-11-14 | 贵州黔程弘景工程咨询有限责任公司 | Beam bottom linear model generation method based on beam bottom linear measurement |
| CN117664081A (en) * | 2023-12-05 | 2024-03-08 | 北旺路桥建设有限公司 | Bridge deck gradient monitoring method based on combined foundation overhead bridge |
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2022
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117053718A (en) * | 2023-10-11 | 2023-11-14 | 贵州黔程弘景工程咨询有限责任公司 | Beam bottom linear model generation method based on beam bottom linear measurement |
| CN117053718B (en) * | 2023-10-11 | 2023-12-12 | 贵州黔程弘景工程咨询有限责任公司 | Beam bottom linear model generation method based on beam bottom linear measurement |
| CN117664081A (en) * | 2023-12-05 | 2024-03-08 | 北旺路桥建设有限公司 | Bridge deck gradient monitoring method based on combined foundation overhead bridge |
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