CN110514130B - Bridge condition on-line tracking monitoring system - Google Patents
Bridge condition on-line tracking monitoring system Download PDFInfo
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- CN110514130B CN110514130B CN201910789658.8A CN201910789658A CN110514130B CN 110514130 B CN110514130 B CN 110514130B CN 201910789658 A CN201910789658 A CN 201910789658A CN 110514130 B CN110514130 B CN 110514130B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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Abstract
The invention discloses an online bridge condition tracking and monitoring system, which comprises a strain sensor, wherein the strain sensor comprises a sealing protective shell, a laser transmitter, a reflecting plate and a photoelectric screen, wherein: the sealing protective shell is used for protecting internal devices of the strain sensor and ensuring the independence of the internal environment of the strain sensor; the laser emitter is used for emitting light; the reflecting plate is used for reflecting light rays emitted by the laser emitter; the photoelectric screen is used for receiving and sensing the light reflected by the reflecting plate. The system provided by the invention is not limited by vehicles on the bridge, the real-time bending condition of the bridge can be obtained according to the offset of the position of the light point on the photoelectric screen no matter the bridge is static or dynamic, the bearing capacity of the bridge can be monitored, and the expansion with heat and contraction with cold and the aging condition of the bridge can be monitored.
Description
Technical Field
The invention belongs to the technical field of bridge detection, and particularly relates to an online bridge condition tracking and monitoring system.
Background
With the rapid development of the transportation industry, the role of the bridge becomes increasingly important, but the health condition of the bridge is gradually reduced due to heavy tasks and excessive load, and in order to improve the transportation safety, the online tracking and monitoring of the safety condition of the bridge is required.
In the prior art, an acceleration sensor in the vertical direction and a speed sensor in the vertical direction are simultaneously installed at a middle measuring point between two span supports of a bridge, signals of vibration acceleration in the vertical direction and vibration speed in the vertical direction generated when a vehicle passes through the bridge are collected, and the quantitative tracking of the health and safety conditions of the bridge is realized through calculation and processing of the signals. However, the method can only monitor the health and safety condition of the bridge under the condition that the vehicle passes through the bridge, the bridge can expand with heat and contract with cold, even if the vehicle does not exist, the bridge can deform under the influence of the expansion with heat and the contraction with cold, so that the health and safety condition of the bridge is influenced, and the bridge can deform as time goes on, and the bridge is gradually aged, so that the bridge has potential safety hazards.
Disclosure of Invention
In view of the above problems, the present invention provides an online bridge condition tracking and monitoring system, which includes a strain sensor, wherein the strain sensor includes a sealing protective shell, a laser emitter, a reflective plate, and a photoelectric screen, wherein:
the sealing protective shell is made of a plastic material and is used for protecting internal devices of the strain sensor and ensuring the independence of the internal environment of the strain sensor;
the laser transmitters are arranged at two ends in the strain sensor, are symmetrical relative to the vertical centerline of the strain sensor and are used for transmitting light;
the two reflecting plates are used for reflecting light rays emitted by the laser emitter, the surface of each reflecting plate is perpendicular to the light rays emitted by the laser emitter, a separation plate is arranged between the two reflecting plates, the separation plate is arranged on a vertical middle line of the strain sensor, and the separation plate is used for dividing the internal space of the strain sensor into two independent spaces which are not mutually influenced;
the photoelectric screen is arranged on one side of the transmitting end of the laser transmitter and is parallel to the reflecting plate and used for receiving and sensing light reflected by the reflecting plate, and the surface of the photoelectric screen is provided with a light through hole which is used for the light transmitted by the laser transmitter to pass through.
Further, one side of the strain sensor is provided with a deformation plate, and the deformation plate is made of a plastic material.
Furthermore, one surface of the strain sensor is fixed with the surface of the deformation plate and is tightly attached to the deformation plate.
Furthermore, the two ends of the deformation plate are provided with telescopic installation support plates, the installation support plates are made of plastic materials, installation holes are formed in the surfaces of the installation support plates, and the installation holes are used for installing and fixing the deformation plate.
Furthermore, scales are arranged on the side faces of the mounting support plates and used for comparing the telescopic lengths of the mounting support plates at the two ends of the deformation plate.
Furthermore, the surfaces of the two ends of the deformation plate are provided with fixing bolts, and the fixing bolts are used for fixedly mounting the support plate.
Further, the system also comprises a processor, a display and a converter;
the converter is used for converting an analog signal generated after the photoelectric screen senses light into a digital signal, and the digital signal comprises the offset of light spots on the photoelectric screens at two ends of the strain sensor;
the input end of the processor is connected with the output end of the converter, the processor processes and calculates the digital signals through a function model, and the function model is as follows:
P＝40*L/(S1+S2)
wherein P is bridge health index, L is distance between the photoelectric screen and the reflecting plate in the initial state of the strain sensor, and S1、S2Respectively the offset of light spots on the photoelectric screens at two ends of the strain sensor;
the input end of the display is connected with the output end of the processor, and the display interface of the display is the same as the photoelectric screen in shape and is increased in proportion to display the change of the position of the light spot on the photoelectric screen.
The system provided by the invention is not limited by vehicles on the bridge, the real-time bending condition of the bridge can be obtained according to the offset of the position of the light point on the photoelectric screen no matter the bridge is static or dynamic, the bearing capacity of the bridge can be monitored, and the expansion with heat and contraction with cold and the aging condition of the bridge can be monitored.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a schematic diagram of a strain sensor mounting structure of an embodiment of the invention;
FIG. 2 shows a schematic view of a photovoltaic panel according to an embodiment of the present invention;
FIG. 3 shows a bottom view of FIG. 1;
FIG. 4 shows a schematic diagram of a strain sensor mounting location of an embodiment of the present invention;
FIG. 5 illustrates a schematic view of monitoring a known monitoring point of an embodiment of the present invention;
FIG. 6 is a schematic diagram showing the location of a light spot when monitoring a known monitoring point according to an embodiment of the present invention;
FIG. 7 illustrates a schematic view of monitoring unknown monitoring points in accordance with an embodiment of the present invention;
fig. 8 shows a schematic diagram of the position of the light spot when monitoring an unknown monitoring point according to an embodiment of the present invention.
In the figure: 1. a strain sensor; 101. a laser transmitter; 102. a photoelectric screen; 103. sealing the protective shell; 104. a reflective plate; 2. a separator plate; 3. a light through hole; 4. a deformation plate; 5. mounting a support plate; 6. mounting holes; 7. fixing the bolt; 8. a bridge.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an online bridge condition tracking and monitoring system, which comprises a strain sensor 1, wherein the strain sensor 1 comprises a sealing protective shell 103, a laser emitter 101, a reflecting plate 104 and a photoelectric screen 102, as shown in fig. 1. Specifically, the sealing protection shell 103 is made of a plastic material and is used for protecting internal devices of the strain sensor 1 and ensuring independence of an internal environment of the strain sensor 1; the number of the laser transmitters 101 is at least two, and the laser transmitters 101 are located at two ends of the interior of the strain sensor 1, are symmetrical about a vertical centerline of the strain sensor 1, and are used for transmitting light; the two reflecting plates 104 are arranged and used for reflecting light rays emitted by the laser emitter 101, the surface of each reflecting plate 104 is perpendicular to the light rays emitted by the laser emitter 101, the isolation plate 2 is arranged between the two reflecting plates 104, the isolation plate 2 is arranged on a perpendicular middle line of the strain sensor 1, and the isolation plate 2 is used for dividing the inner space of the strain sensor 1 into two independent spaces which are not influenced with each other; the photoelectric screen 102 is arranged on one side of the emitting end of the laser emitter 101 and is parallel to the reflecting plate 104, and is used for receiving and sensing light rays reflected by the reflecting plate 104, the surface of the photoelectric screen 102 is provided with a light through hole 3, and the light through hole 3 is used for light rays emitted by the laser emitter 101 to pass through.
1 one side of strain sensor is provided with deformation board 4, deformation board 4 adopts plastic material to make, the one side of strain sensor 1 and 4 fixed surfaces of deformation board are in the same place and closely laminate. The flexible mounting support plate 5 that all is provided with the telescopic at 4 both ends of deformation board, mounting support plate 5 adopts plastic material to make, the mounting support plate 5 side is provided with the scale, the scale is used for comparing the flexible length of 4 both ends mounting support plate 5 of deformation board. As shown in fig. 3, the surface of the mounting support plate 5 is provided with a mounting hole 6, the mounting hole 6 is used for mounting and fixing the deformation plate 4, the surfaces of both ends of the deformation plate 4 are provided with fixing bolts 7, and the fixing bolts 7 are used for fixing the mounting support plate 5.
The system further comprises a processor, a display, a converter; the input end of the converter is connected with the output end of the photoelectric screen 102, the converter is used for converting an analog signal generated after the photoelectric screen 102 senses light into a digital signal, and the digital signal comprises the offset of light spots on the photoelectric screen 102 at two ends of the strain sensor 1; the input end of the processor is connected with the output end of the converter, the processor processes and calculates the digital signals through a function model, and the function model is as follows:
P＝40*L/(S1+S2)
wherein P is the health index of the bridge 8, L is the distance between the photoelectric screen 102 and the reflecting plate 104 when the strain sensor 1 is in the initial state, and S1、S2Respectively the offset of light spots on the photoelectric screens 102 at two ends of the strain sensor 1; the input end of the display is connected with the output end of the processor, and the display interface of the display is the same as the photoelectric screen 102 in shape and is increased in proportion, and is used for displaying the change of the position of the light spot on the photoelectric screen 102.
Exemplarily, fig. 1 shows a schematic diagram of a mounting structure of a strain sensor according to an embodiment of the present invention, as shown in fig. 1, a separation plate 2 is disposed in a middle position of a strain sensor 1, the strain sensor 1 is symmetrically disposed with respect to the separation plate 2, and an internal space of the strain sensor 1 is divided into two mutually independent spaces without mutual influence by the separation plate 2. Each independent space of the strain sensor 1 includes the laser emitter 101, the reflective plate 104, and the photoelectric screen 102, specifically, one, two, or three laser emitters 101 may be disposed in each independent space, but not limited thereto, and in this embodiment, it is described that one laser emitter 101 is disposed in each independent space, that is, two laser emitters 101 are shared in the strain sensor 1 for emitting light. Two side surfaces of the isolation plate 2 are provided with reflection plates 104 for reflecting light, and when the strain sensor 1 is in an initial state, the light emitted by the laser emitter 101 is perpendicular to the reflection plates 104. The emitting end of the laser emitter 101 is provided with a photoelectric screen 102 for receiving and sensing the light reflected by the reflecting plate 104. The optical electronic screen 102 is a photosensitive element, and when light irradiates different positions of the optical electronic screen 102, analog signals generated by the optical electronic screen 102 are different. One side of the photoelectric screen 102 is tightly attached to one side of the emitting end of the laser emitter 101, and when the strain sensor 1 is in an initial state, the photoelectric screen 102 is parallel to the reflecting plate 104. Fig. 2 shows a schematic diagram of a photoelectric screen according to an embodiment of the present invention, as shown in fig. 2, a light through hole 3 is formed on a surface of the photoelectric screen 102, and in order to facilitate coordination of the device structure, the light through hole 3 in this embodiment is disposed at an intermediate position on the surface of the photoelectric screen 102, but not limited thereto, the diameter of the light through hole 3 should not be set too large, and in order not to affect the sensing effect of the photoelectric screen 102, the diameter of the light through hole 3 is set to be very small, preferably, the diameter is set to be 0.04mm to 0.07mm, and light emitted by the laser emitter 101 can pass through the light through hole 3 and reach the reflection plate 104. The outside of strain sensor 1 is equipped with sealed protective housing 103 for protect strain sensor 1's internal device, and guarantee the independence of strain sensor 1 internal environment, and wherein sealed protective housing 103 is made by plastic material, the strain sensor 1 of being convenient for is crooked and is resumeed. One side of the strain sensor 1 is provided with a deformation plate 4, the center line of the strain sensor 1 coincides with the center line of the deformation plate 4, the surface of the deformation plate 4 is fixed with one side of the strain sensor 1 and tightly attached to the surface of the deformation plate, the deformation plate 4 is made of plastic materials, and the deformation plate 4 is convenient to bend and recover. 4 both ends of deformation board all are provided with telescopic installation extension board 5, installation extension board 5 is favorable to improving the sensitive degree of deformation board 4 and strain sensor 1 deformation, it is specific, when installation extension board 5 is pulled out, installation extension board 5 and deformation board 4 will increase as a holistic length, length is longer more, the deformation takes place more easily for the object, consequently, the sensitive degree of deformation board 4 deformation will improve, again because strain sensor 1 is fixed and closely laminating together with deformation board 4, when deformation board 4 takes place deformation, will drive strain sensor 1 and take place deformation together, consequently, the sensitive degree of strain sensor 1 deformation also can improve. Wherein installation extension board 5 adopts plastic material to make, and installation extension board 5 side is provided with the scale, and the scale is used for the flexible length of contrast 4 both ends installation extension boards 5 of deformation board, and is exemplary, when the installation extension board 5 of 4 one ends of deformation board pulled out certain length, the same length also need pull out for installation extension board 5 of the 4 other ends of deformation board, and the back is pulled out to installation extension board 5, looks over the scale number that this installation extension board 5 pulled out from 4 one ends of deformation board. For example, taking 5m as an example, the installation support plate 5 at the other end of the deformation plate 4 is also pulled out by a length of 5m according to the scale, and the scale is favorable for ensuring that the lengths of the installation support plates 5 at the two ends of the deformation plate 4 are the same.
Fig. 3 shows a bottom view of fig. 1, and as shown in fig. 3, the mounting plate 5 is provided with mounting holes 6 on the surface, the mounting holes 6 are used for mounting and fixing the deformation plate 4, and exemplarily, each mounting plate 5 is provided with two mounting holes 6 on the surface. The surfaces of the two ends of the deformation plate 4 are provided with fixing bolts 7, the fixing bolts 7 are used for fixedly mounting the support plate 5, and each end of the deformation plate 4 is provided with one fixing bolt 7.
When the system works, one or more monitoring points are selected at the bottom of a bridge 8, each monitoring point is provided with a strain sensor 1, the embodiment is described by taking one monitoring point as an example, exemplarily, as shown in fig. 4, one monitoring point is selected at the bottom of the bridge 8, a deformation plate 4 is tightly attached to the bottom of the bridge 8, the deformation plate 4 is parallel to the bridge 8, the central point of the deformation plate 4 and the monitoring point of the bridge 8 are on the same vertical line, the mounting support plates 5 at two ends of the deformation plate 4 are respectively pulled out by 5m, the mounting support plates 5 are fixed by screwing a fixing bolt 7, and then the deformation plate 4 and the mounting support plates 5 are fixed together by screws through mounting holes 6. When vehicles on the bridge 8 are too many or the bridge 8 expands with heat and contracts with cold or the bridge 8 ages, the bridge 8 is easy to bend, when the bending degree of the bridge 8 exceeds a limit value, the bridge 8 is easy to break, especially the lowest point of the bent part of the bridge 8 is easy to break, namely, a monitoring point needs to be tracked and monitored on line, and the condition of the monitoring point is known in time. There are two situations about the monitoring point, one is that the position of the monitoring point is known, namely the position needing to be monitored is known; the other is that the location of the monitoring point is unknown, i.e. it is not known for a while which specific location the monitoring is.
For example, fig. 5 shows a schematic diagram of a monitoring known monitoring point according to an embodiment of the present invention, as shown in fig. 5, a known monitoring point position of a bridge 8 is bent, and since the deformation plate 4 is tightly attached and fixed at the bottom of the bridge 8, the deformation plate 4 is also bent along with the bending of the bridge 8, and thus the strain sensor 1 is bent. In the initial state of the strain sensor 1, the light emitted from the laser emitter 101 is perpendicular to the reflective plate 104, i.e., the light emitted from the laser emitter 101 is in the horizontal direction. When the strain sensor 1 is bent, the laser emitter 101 swings, the light emitted by the laser emitter 101 is not perpendicular to the reflective plate 104, an included angle α is formed between the light emitted by the left laser emitter 101 and a horizontal line, an included angle β is formed between the light emitted by the right laser emitter 101 and the horizontal line, and the position of the light on the reflective plate 104 deviates. When the light beam is emitted to the reflective plate 104 in a direction forming an included angle α with the horizontal line, the light beam is reflected in a direction forming an included angle α with the horizontal line, and at this time, the included angle between the incident light beam and the reflected light beam is 2 α; when the light beam is emitted to the reflective plate 104 in a direction forming an included angle β with the horizontal line, the light beam is reflected in a direction forming an included angle β with the horizontal line, and the included angle between the incident light beam and the reflected light beam is 2 β. The position of the light ray on the photoelectric screen 102 can be deviated, the position deviation amount of the light ray on the photoelectric screen 102 is larger than the position deviation amount of the light ray on the reflecting plate 104, the slight change of the bridge 8 can be amplified by increasing the deviation amount, the observation and the calculation are facilitated, and the accuracy is improved. Since the strain sensor 1 is located at the monitoring point of the bridge 8, when the strain sensor 1 is bent, the light emitted by the laser emitters 101 at the two ends of the strain sensor 1 is reflected by the reflective plate 104, and the light falls on the lower half portion of the photoelectric screen 102. The photoelectric screen 102 can generate corresponding analog signals after sensing light, the analog signals comprise the offset of light spots on the photoelectric screen 102 at two ends of the strain sensor 1, the analog signals are converted into digital signals through a converter and are sent to a processor, and the processor generates corresponding analog signals according to a function model
P＝40*L/(S1+S2)
Calculating the health condition of the current known monitoring point, wherein P is the health index of the bridge 8, L is the distance between the photoelectric screen 102 and the reflecting plate 104 when the strain sensor 1 is in the initial state, and S1、S2The offsets of the light spots on the photoelectric screens 102 at the two ends of the strain sensor 1 are respectively, and the light spots are displayed at the corresponding positions on the display interface of the display, as shown in fig. 6, so that the strain sensor can be visually displayed, and is convenient for the staff to observe and research. Illustratively, L is 5m, S1、S2The values 3 and 5 are taken respectively and are substituted into the function model to calculate that P is 25.
For example, fig. 7 shows a schematic diagram of monitoring an unknown monitoring point according to an embodiment of the present invention, as shown in fig. 7, the strain sensor 1 is installed at a non-monitoring point position of a bridge 8, the unknown monitoring point position of the bridge 8 is bent, and since the deformation plate 4 is tightly attached and fixed to the bottom of the bridge 8, the deformation plate 4 is also bent along with the bending of the bridge 8, and the strain sensor 1 is bent, wherein the principle of light ray deviation is the same as that of monitoring the known monitoring point. Because strain sensor 1 is in the non-monitoring point position of bridge 8, therefore when strain sensor 1 is crooked, the reflection of reflecting plate 104 is passed through to the light of strain sensor 1 both ends laser emitter 101 transmission, and light all can fall on photoelectric screen 102, and is specific: when the position of an unknown monitoring point is on the right side of the installation position of the strain sensor 1, light at the left end of the strain sensor 1 falls on the lower half part of the left-end photoelectric screen 102, and light at the right end of the strain sensor 1 falls on the upper half part of the right-end photoelectric screen 102; when unknown monitoring point position was on the left side of strain sensor 1 mounted position, strain sensor 1 left end light can fall on the first half of left end photoelectric screen 102, and strain sensor 1 right-hand member light can fall on the latter half of right-hand member photoelectric screen 102. In this embodiment, the position of an unknown monitoring point on the right side of the installation position of the strain sensor 1 is taken as an example for explanation, the photoelectric screen 102 senses light and generates a corresponding analog signal, the analog signal is converted into a digital signal through a converter and is sent to a processor, the digital signal is processed by the processor and then a light spot is displayed on a corresponding position of a display interface of a display, as shown in fig. 8, a schematic diagram of the position of the light spot when the unknown monitoring point is monitored according to the embodiment of the present invention is shown, which side of the installation position of the strain sensor 1 the unknown monitoring point is located can be known by observing the upper half part or the lower half part of the photoelectric screen 102 at two ends after the light spot is deviated, and the specific position of the unknown monitoring point can be gradually determined by installing a plurality of strain sensors 1, so as to track and monitor the monitoring point.
Therefore, for known monitoring points, the system can directly monitor the known monitoring points, and for unknown monitoring points, the system can judge the positions of the monitoring points through the position change of the light points to complete online tracking monitoring.
The system provided by the invention is not limited by vehicles on the bridge 8, and the real-time bending condition of the bridge 8 can be obtained according to the offset of the position of the light point on the photoelectric screen 102 no matter the bridge 8 is static or dynamic. When the bridge 8 expands with heat and contracts with cold and ages, the bridge 8 deforms, but the deformation speed is very slow, so that the bridge 8 can be continuously in a certain deformation state for a period of time. If the bridge 8 is continuously in a certain deformation state for a period of time, and the deformation is recovered in the later period, the system determines that the bridge 8 expands with heat and contracts with cold, and learns the health condition of the bridge 8 when the bridge 8 expands with heat and contracts with cold according to the deformation degree of the bridge 8; if the bridge 8 is continuously in a certain deformation state for a period of time, the later deformation is not recovered, the system determines that the bridge 8 is aged, and learns the health condition of the bridge 8 when the bridge is aged according to the deformation degree of the bridge 8.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. An online bridge condition tracking and monitoring system, which comprises a strain sensor (1), wherein the strain sensor (1) comprises a sealing protective shell (103), a laser emitter (101), a reflecting plate (104), a photoelectric screen (102), a processor, a display and a converter, wherein:
the sealing protection shell (103) is made of a plastic material and is used for protecting internal devices of the strain sensor (1) and ensuring the independence of the internal environment of the strain sensor (1);
the number of the laser emitters (101) is at least two, and the laser emitters (101) are located at two ends of the interior of the strain sensor (1), are symmetrical about a vertical center line of the strain sensor (1), and are used for emitting light;
the two reflecting plates (104) are used for reflecting light rays emitted by the laser emitter (101), the surface of each reflecting plate (104) is perpendicular to the light rays emitted by the laser emitter (101), the isolating plate (2) is arranged between the two reflecting plates (104), the isolating plate (2) is arranged on the vertical middle line of the strain sensor (1), and the isolating plate (2) is used for dividing the internal space of the strain sensor (1) into two independent spaces which are not mutually influenced;
the photoelectric screen (102) is arranged on one side of the emitting end of the laser emitter (101) and is parallel to the reflecting plate (104) and used for receiving and sensing light rays reflected by the reflecting plate (104), the surface of the photoelectric screen (102) is provided with a light through hole (3), and the light through hole (3) is used for the light rays emitted by the laser emitter (101) to pass through;
the input end of the converter is connected with the output end of the photoelectric screen (102), the converter is used for converting an analog signal generated after the photoelectric screen (102) senses light into a digital signal, and the digital signal comprises the offset of light spots on the photoelectric screen (102) at two ends of the strain sensor (1);
the input end of the processor is connected with the output end of the converter, the processor processes and calculates the digital signals through a function model, and the function model is as follows:
P＝40*L/(S1+S2)
wherein P is the health index of the bridge (8), L is the distance between the photoelectric screen (102) and the reflecting plate (104) when the strain sensor (1) is in the initial state, and S1、S2Respectively the offset of light spots on the photoelectric screens (102) at two ends of the strain sensor (1);
the input end of the display is connected with the output end of the processor, and the display interface of the display is the same as the photoelectric screen (102) in shape and is increased in proportion and used for displaying the change of the position of the light spot on the photoelectric screen (102).
2. The bridge condition on-line tracking and monitoring system according to claim 1, wherein a deformation plate (4) is arranged on one surface of the strain sensor (1), and the deformation plate (4) is made of a plastic material.
3. The bridge condition on-line tracking and monitoring system according to claim 2, characterized in that one surface of the strain sensor (1) is fixed with and closely attached to the surface of the deformation plate (4).
4. The bridge condition on-line tracking and monitoring system according to claim 2, wherein both ends of the deformation plate (4) are provided with retractable installation support plates (5), the installation support plates (5) are made of plastic materials, the surface of each installation support plate (5) is provided with an installation hole (6), and the installation holes (6) are used for installing and fixing the deformation plate (4).
5. The bridge condition on-line tracking and monitoring system according to claim 4, characterized in that the side of the mounting support plate (5) is provided with a scale for comparing the telescopic length of the mounting support plate (5) at the two ends of the deformation plate (4).
6. The bridge condition on-line tracking and monitoring system according to any one of claims 2-5, characterized in that the deformation plate (4) is provided with fixing bolts (7) on both end surfaces, and the fixing bolts (7) are used for fixing the installation support plate (5).
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| CN204649399U (en) * | 2015-04-20 | 2015-09-16 | 中铁二十五局集团第一工程有限公司 | Highway bridge load-bearing capacity pick-up unit |
| KR101718308B1 (en) * | 2016-10-21 | 2017-03-22 | 한국건설기술연구원 | System for monitoring pylon inner deterioration of cable bridge having reed switch-based lighting lamp for imaging acquisition, and method for the same |
| CN109520465A (en) * | 2019-01-08 | 2019-03-26 | 同济大学 | The fixed device of the adjustable strain transducer of gauge length |
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