LU500241B1 - Device and method for monitoring the height of bridge deck based on laser ranging - Google Patents

Device and method for monitoring the height of bridge deck based on laser ranging Download PDF

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Publication number
LU500241B1
LU500241B1 LU500241A LU500241A LU500241B1 LU 500241 B1 LU500241 B1 LU 500241B1 LU 500241 A LU500241 A LU 500241A LU 500241 A LU500241 A LU 500241A LU 500241 B1 LU500241 B1 LU 500241B1
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LU
Luxembourg
Prior art keywords
bridge
laser ranging
height
laser
rotating
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LU500241A
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French (fr)
Inventor
Fenju An
Wenqing Shi
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Univ Guangdong Ocean
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Publication of LU500241B1 publication Critical patent/LU500241B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/46—Indirect determination of position data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G01S7/4813—Housing arrangements

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The invention discloses a device and method for monitoring the height of bridge deck based on laser ranging, including a laser range finder, a rotating mechanism and a balancing connection mechanism; the laser range finder includes laser ranging assemblies which include a shell and a laser transmitter and a laser receiver installed at the front of the shell; the rotating mechanism includes a rotating table, a first gear set controlling the rotation of the rotating table, a micro-rotating platform fixedly connected to the laser ranging assembly and a second gear set controlling the rotation of the micro-rotating platform, respectively. The rotating mechanism includes a rotating table, a first gear set controlling the rotation of the rotating table, a micro-rotating platform fixedly connected to the laser ranging assembly and a second gear set controlling the rotation of the micro-rotating platform.

Description

DESCRIPTION Device and method for monitoring the height of bridge deck based on laser ranging
TECHNICAL FIELD The invention relates to the technical field of bridge detection, in particular to a device and method for monitoring the height of bridge deck based on laser ranging.
BACKGROUND With the development of economy, highway and railway transportation are becoming more and more important in national economy and people’s life. In order to adapt to the modern high-speed development of the transportation industry, bridges are also extended to buildings built to cross mountains, unfavorable geology or meet other or meet other transportation needs to make the passage more convenient.
With the increasing concern for bridge safety and durability, some key engineering bridges require regular inspection of the actual bridge operation to provide experimental data for engineering design, feedback information for verifying structural analysis, calculation assumptions and design methods in bridge design, and can be used for in-depth study of bridge structures and their unknown or uncertainty problems in complex environments. At the same time, the periodic inspection and evaluation of the bridge structure condition can provide early warning signals when the bridge operation is abnormal, providing a basis for bridge maintenance and repair and management decisions.
The incident of wave heave on the bridge deck of the Humen Bridge on May 5, 2020, has raised concerns about the safety of large span bridges like the Humen Bridge. How to monitor the real-time changes of the bridge deck height of such bridges in real time is directly related to the safety of the bridge and the passing vehicles, and there is a significant risk of personal and property safety.
SUMMARY The purpose of the present invention is to provide a device and method for monitoring the height of bridge deck based on laser ranging to solve the problems existing in the prior art to realize real-time monitoring of bridge deck height change, so as to take timely measures and effectively realize real-time detection and early warning of the bridge.
To achieve the above purpose, the present invention provides the following scheme: The present invention provides a device and method for monitoring the height of a bridge deck based on laser ranging, comprising a laser range finder, a rotating mechanism and a balancing connection mechanism connecting the laser range finder and the rotating mechanism; The laser range finder comprises more than two groups of laser ranging assemblies, wherein the laser ranging assemblies comprise a shell and a laser transmitter and a laser receiver which are arranged at the front end of the shell; The rotating mechanism comprises a rotating table, a first gear set for controlling the rotation of the rotating table, a micro-rotating platform respectively fixedly connected with the shell and a second gear set for controlling the rotation of the micro-rotating platform; The micro-rotating platforms are axially connected with the rotating table, and the micro- rotating platforms are arranged in the circumferential direction of the rotating table at intervals; The balancing connection mechanism comprises a fixed round table fixedly arranged below the shell, a sleeve is fixedly arranged at the bottom end of the fixed round table, and an annular groove for accommodating the sleeve to rotate is arranged on the micro-rotating platform; A locking assembly and more than two groups of plunger components are arranged between the fixed round table and the micro-rotating platform.
Preferably, the first gear set comprises a first gear fixedly and axially connected with the rotary table and a second gear meshed with the first gear, and the second gear is connected with an output shaft of a first stepping motor.
Further, the second gear set comprises a third gear fixedly connected with the micro- rotating platform and a fourth gear meshed with the third gear, and the fourth gear is connected with an output shaft of a second stepping motor.
The locking assembly comprises an n-shaped locking pin fixedly arranged at the lower end of the fixed round table; the micro-rotating platform is provided with a first cavity for accommodating the locking pin to rotate; the bottom end of the first cavity is fixedly connected with a first spring; The first spring is fixedly connected with an extrusion table, and the locking pin is arranged on a side far away from the first spring, Additionally, each group of plunger assemblies comprises plungers and second springs; the lower end of the fixed round table is provided with a second cavity for accommodating the plungers and the second springs; one end of the second springs is fixedly connected with the plungers; and the other end of the second spring is fixedly connected with the inner end face of the second cavity; the micro-rotating platform is provided with a third cavity for accommodating the plungers, and a third spring is fixedly arranged in the third cavity.
The method for monitoring the height of bridge deck based on laser ranging, which is carried out by applying the device for monitoring the height of bridge deck based on laser ranging, comprising the following steps: Step a. Determine the installation position of the detection device, set the installation position to A; measure the height difference between the installation position A and the bridge deck, set the height difference to h; and measure the overall length of the bridge, set the bridge length to L; Step b. Calculate the angle interval between the two ends of the bridge relative to the mounting position A according to the mounting position A, the height difference h and the length L of the bridge, determine the number of groups of laser ranging assemblies needed according to the angle range that can be measured by each group of laser ranging assemblies, and mount them to the rotating mechanism; Step c. Fix the rotating mechanism in the installation position and adjust the angle so that the measuring points of all laser range finders cover the whole or part of the bridge; Step d. When the bridge does not receive the influence of traffic, wind and other factors, and the laser ranging assembly is at a different tilt angle 6, the distance between the installation position A and the corresponding point of the bridge is measured by the laser ranging assembly, and the corresponding point on the bridge is set to B, then the distance from the bridge point B to the installation position A is Lag.
Step e. When the bridge under the influence of traffic, wind and other factors, plus the laser ranging assembly is tilted at an angle of 6., the laser beam from point A to point B changes from point B to point B' due to the change of the bridge surface, and the distance from point B' to installation position A is Lag,; and the corresponding to the distance is changed by BB'=d=L4p — Lg; Step f. Suppose the height of the bridge to change by x, which is substituted to the formula as below: x h d La And calculate the relative change x of bridge deck height, X= ms * (Lap — Lag) Step g. Calculating the change in height of the corresponding point of the laser ranging assembly at different angles © based on the change in distance of the corresponding point measured by the laser ranging assembly at different angles 6; Step h. Real-time curve of the bridge deck height change with the bridge deck position is plotted according to the calculation results for monitoring the height change of the bridge deck.
Preferably, the installation location A in Step a can be located at the top of the bridge tower, the top of a super tall building near the bridge or the top of a hill near the bridge.
And the tilt angle © of all laser ranging assemblies in Step d and Step e is adjusted by the whole first gear set, and the tilt angle 6 of individual laser ranging assemblies is adjusted by the second gear set.
The invention discloses the following technical effects: the invention adjusts the tilt angle 6 of all laser ranging assemblies by the first gear set as a whole, adjusts the tilt angle 6 of individual laser ranging assemblies by the second gear set, measures the change between the height of the bridge deck when the laser range finder is at the same tilt angle by combining the overall and individual laser ranging assembly movements, and calculates the height change of the bridge deck at the formula. At the same time multi-point simultaneous measurement, more data, reduce the deviation caused by less data, real-time monitoring of the bridge deck height change, so that timely measures can be taken to effectively achieve real-time detection and early warning of the bridge.
The invention realizes the disassembly and connection of the laser range finder and the rotating mechanism by balancing the sleeve, locking mechanism and plunger mechanism in the connection mechanism, and the connection mode is simple and convenient. At the same time, the balance stability of the laser range finder is improved by adopting the potential energy of multiple springs in the locking mechanism and the plunger mechanism, so as to improve the accuracy of the detection.
BRIEF DESCRIPTION OF THE FIGURES In order to explain the embodiments of the present invention or the technical scheme in the prior art more clearly, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in the field, other drawings can be obtained according to these drawings without paying creative labor.
Fig. 1 is a schematic structural diagram of the detection device of the present invention; Fig. 2 is a top view of the detection device of the present invention; Fig. 3 is a bottom view of the detection device of the present invention; Fig. 4 is a schematic structural diagram of the laser ranging module of the present invention; Fig. 5 is a partial enlarged view of c in Fig. 4;
Fig. 6 1s a schematic diagram of the installation position of the detection device of the present invention; Fig. 7 1s a schematic diagram of the relative positional relationship of the components of the present invention.
Labels: 1: shell, 2: laser transmitter, 3: laser receiver, 4: rotary table, 5: micro-rotating platform, 6: first gear, 7: second gear, 8: first stepping motor, 9: third gear, 10: fourth gear, 11: second stepping motor, 12: fixed platform, 13: sleeve, 14: second cavity, 15: second spring, 16: plunger, 17: locking pin, 18: annular groove, 19: third cavity, 20: first spring, 21: extrusion table, 22: fixed convex shoulder, 23: first cavity, 24: third spring.
DESCRIPTION OF THE INVENTION The technical scheme in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative labor belong to the scope of protection of the present invention.
In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be further explained in detail with reference to the drawings and specific embodiments.
As shown in Figure 1-7, the present invention provides a device and method for monitoring the height of a bridge deck based on laser ranging, comprising a laser range finder, a rotating mechanism and a balancing connection mechanism connecting the laser range finder and the rotating mechanism;
The laser range finder comprises more than two groups of laser range finder assemblies. The laser range finder assemblies include shell 1, laser emitter 2 and laser receiver 3 set at the front end of shell 1. The laser range finder uses the laser to accurately measure the distance of the target. When the laser range finder works, it emits a very thin laser to the target through the laser emitter 2. The laser beam reflected by the target 1s received by the laser receiver 3. The time from the laser beam to the target is measured and the distance from the laser range finder to the target 1s calculated.
The rotating mechanism comprises a rotating table 4, a first gear set for controlling the rotation of the rotating table 4, a micro-rotating platform 5 respectively fixedly connected with the shell 1 and a second gear set for controlling the rotation of the micro- rotating platform 5; The micro-rotating platform 5 is axially connected with the rotating platform 4. The micro-rotating platform 5 can rotate on the rotating platform 4, and the micro-rotating platform 5 1s arranged at intervals in the circumferential direction of the rotating platform 4, but the laser ranging assemblies located on different micro-rotating platforms 5 will not interfere with it.
The first gear set comprises the first gear 6 connected with the fixed axis of the rotating table 4 and the second gear 7 meshing with the first gear 6, and the second gear 7 is connected with the output shaft of the first stepping motor 8. The tooth number ratio of the first gear 6 to the second gear 7 is 60 : 1. Through the transmission ratio between the first gear 6 and the second gear 7, the rotation angle of the rotating table 4 can be obtained more accurately, so that the later measurement is more accurate. The rotation of the rotating table 4 1s realized by the first gear set, which drives all the laser ranging assemblies to rotate.
The second gear set comprises a third gear 9 connected to the fixed shaft of the micro- rotating platform 5 and a fourth gear 10 meshed with the third gear 9, and the fourth gear 1s connected to the output shaft of the second step motor 11. The tooth number ratio of the third gear 9 to the fourth gear 10 is 10 : 1, and the fourth gear 10 is driven by the second stepping motor 11, so as to realize the rotation of the micro-rotating platform 5 fixedly connected to the third gear 9. At the same time, the tooth number ratio is used to obtain a more accurate rotation angle. The rotation of micro-rotating platform 5 is realized through the second gear set, so as to realize the rotation of a single laser ranging assembly.
The balancing connection mechanism includes the fixed platform 12 set below the shell 1, the bottom end of the fixed platform 12 set with sleeve 13, and the annular groove 18 set on the micro-rotating platform 5 that accommodates the rotation of sleeve 13; There are locking assemblies and more than two sets of piston components between fixed platform 12 and micro-rotating platform 5. The locking assembly includes the ’ n ’ type locking pin 17 fixed at the lower end of the fixed round table 12. The first cavity 23 containing the rotation of locking pin 17 is opened on the micro-rotating platform 5. The bottom end of the first cavity 23 is fixedly connected with the first spring 20, and the first spring 20 1s fixedly connected with the extrusion table 21. The locking pin 17 is set on the side far from the first spring 20, and the first cavity 23 is set with a fixed convex shoulder 22 that limits the movement of the ’ n ° type locking pin 17.
Each group of piston components includes piston 16 and second spring 15, and the lower end of fixed platform 12 is provided with the second cavity 14 containing piston and second spring. One end of second spring 15 is fixedly connected with piston 16, and the other end of second spring 15 is fixedly connected with the internal end of second cavity
14. The third cavity 19 containing plunger 16 1s set on the micro-rotating platform 5, and the third spring 24 is fixed in the third cavity 19. In the process of installing shell 1, the second cavity 14 and the third cavity 19 are in the corresponding state, and the locking pin 17 1s in the corresponding position with the through hole on the fixed convex shoulder 22. The locking pin 17 is inserted into the first cavity 23, and then when the rotating shell 1 reaches the established position, the plunger 16 enters the third cavity 19 to realize the radial locking of shell 1. Under the action of the first spring 20, the lower end structure of the locking pin 17 is combined with the fixed convex shoulder 22 to achieve the locking function.
The method for monitoring the height of bridge deck based on laser ranging comprises the following steps: Step a. Determine the installation position of the detection device, set the installation position to A; measure the height difference between the installation position A and the bridge deck, set the height difference to h; and measure the overall length of the bridge, set the bridge length to L; Step b. Calculate the angle interval between the two ends of the bridge relative to the mounting position A according to the mounting position A, the height difference h and the length L of the bridge, determine the number of groups of laser ranging assemblies needed according to the angle range that can be measured by each group of laser ranging assemblies, and mount them to the rotating mechanism; Step d. When the bridge does not receive the influence of traffic, wind and other factors, and the laser ranging assembly is at a different tilt angle 6, the distance between the installation position A and the corresponding point of the bridge is measured by the laser ranging assembly, and the corresponding point on the bridge 1s set to B, then the distance from the bridge point B to the installation position A is Lag.
Step e. When the bridge under the influence of traffic, wind and other factors, plus the laser ranging assembly is tilted at an angle of 6., the laser beam from point A to point B changes from point B to point B' due to the change of the bridge surface, and the distance from point B' to installation position A is L,g,; and the corresponding to the distance is changed by BB'=d=L4p — Lagı; Step f. Suppose the height of the bridge to change by x, which is substituted to the formula as below: x h d La And calculate the relative change x of bridge deck height, h x an. (Lap — Lagı) Step g. Calculating the change in height of the corresponding point of the laser ranging assembly at different angles 6 based on the change in distance of the corresponding point measured by the laser ranging assembly at different angles 6; Step h. Real-time curve of the bridge deck height change with the bridge deck position is plotted according to the calculation results for monitoring the height change of the bridge deck.
In Steps d and e, the tilt angle © of all laser range finders is adjusted by the whole first gear group, and the tilt angle 6 of a single laser range finder is adjusted by the second gear set. When the laser range finder is at the same tilt angle, the change between the bridge deck heights 1s measured by the combination of the overall movement and a single laser range finder. There are more measured points and less data deviation.
In the description of the present invention, it is to be understood that the terms "longitudinal", "transverse", "up", "down”, "vertical", "horizontal", "top", "bottom", "inside ", "outside" and the like indicate orientation or positional relationships based on those shown in the accompanying drawings and are intended only to facilitate the description of the present invention, not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore are not to be construed as a limitation.
The embodiments described above are only a description of the preferred way of the invention, not a limitation of the scope of the invention. Without departing from the spirit of the design of the invention, all kinds of deformations and improvements made to the technical solutions of the invention by a person of ordinary skill in the art shall fall within the scope of protection determined by the claims of the invention.

Claims (8)

CLAIMS:
1. A device for monitoring the height of bridge deck based on laser ranging is characterized by comprising a laser range finder, a rotating mechanism and a balancing connection mechanism connecting the laser range finder and the rotating mechanism; the laser range finder comprises more than two groups of laser ranging assemblies, wherein the laser ranging assemblies comprise a shell (1) and a laser transmitter (2) and a laser receiver (3) which are arranged at the front end of the shell (1); the rotating mechanism comprises a rotating table (4), a first gear set for controlling the rotation of the rotating table (4), a micro-rotating platform (5) respectively fixedly connected with the shell (1) and a second gear set for controlling the rotation of the micro- rotating platform (5); the micro-rotating platforms (5) are axially connected with the rotating table (4), and the micro-rotating platforms (5) are arranged in the circumferential direction of the rotating table (4) at intervals; the balancing connection mechanism comprises a fixed round table (12) fixedly arranged below the shell, a sleeve (13) is fixedly arranged at the bottom end of the fixed round table (12), and an annular groove (18) for accommodating the sleeve (13) to rotate is arranged on the micro-rotating platform (5); a locking assembly and more than two groups of plunger components are arranged between the fixed round table (12) and the micro-rotating platform (5).
2. The device for monitoring the height of bridge deck based on laser ranging according to claim 1 1s characterized in that the first gear set comprises a first gear (6) fixedly and axially connected with the rotary table (4) and a second gear (7) meshed with the first gear (6), and the second gear (7) 1s connected with an output shaft of a first stepping motor (8).
3. The device for monitoring the height of bridge deck based on laser ranging according to claim 1 1s characterized in that the second gear set comprises a third gear (9) fixedly connected with the micro-rotating platform (5) and a fourth gear (10) meshed with the third gear (9), and the fourth gear (10) is connected with an output shaft of a second stepping motor (11).
4. The device for monitoring the height of bridge deck based on laser ranging according to claim 1 is characterized in that the locking assembly comprises an n-shaped locking pin (17) fixedly arranged at the lower end of the fixed round table (12); the micro- rotating platform (5) is provided with a first cavity (23) for accommodating the locking pin (17) to rotate; the bottom end of the first cavity (23) is fixedly connected with a first spring (20); the first spring (20) 1s fixedly connected with an extrusion table (21), and the locking pin (17) is arranged on a side far away from the first spring (20).
5. The device for monitoring the height of bridge deck based on laser ranging according to claim 1 is characterized in that each group of plunger assemblies comprises plungers (16) and second springs (15); the lower end of the fixed round table (12) is provided with a second cavity (14) for accommodating the plungers and the second springs; one end of the second springs (15) is fixedly connected with the plungers (16); and the other end of the second spring (15) 1s fixedly connected with the inner end face of the second cavity (14); the micro-rotating platform (5) is provided with a third cavity (19) for accommodating the plungers (16), and a third spring (24) is fixedly arranged in the third cavity (19).
6. The method for monitoring the height of bridge deck based on laser ranging, which is carried out by applying the device for monitoring the height of bridge deck based on laser ranging to any one of claims 1-5, and is characterized by comprising the following steps:
step a: determine the installation position of the detection device, set the installation position to A; measure the height difference between the installation position A and the bridge deck, set the height difference to h; and measure the overall length of the bridge, set the bridge length to L;
step b: calculate the angle interval between the two ends of the bridge relative to the mounting position A according to the installation position A, the height difference h and the length L of the bridge, determine the number of groups of laser ranging assemblies needed according to the angle range that can be measured by each group of laser ranging assemblies, and mount them to the rotating mechanism;
step c: fix the rotating mechanism in the installation position and adjust the angle so that the measuring points of all laser range finders cover the whole or part of the bridge;
step d: when the bridge does not receive the influence of traffic, wind and other factors, and the laser ranging assembly is at a different tilt angle 6, the distance between the installation position A and the corresponding point of the bridge is measured by the laser ranging assembly, and the corresponding point on the bridge is set to B, then the distance from the bridge point B to the installation position A is Lap;
step e: when the bridge under the influence of traffic, wind and other factors, plus the laser ranging assembly is tilted at an angle of 6, the laser beam from point A to point B changes from point B to point B' due to the change of the bridge deck, and the distance from point B' to installation position A is Lag,; and the corresponding to the distance is changed by BB'=d=L4p — Lg; step f: suppose the height of the bridge to change by x, which is substituted to the formula as below: x h d La and calculate the relative change x of bridge deck height, X= ms * (Lap — Lag) step g: calculating the change in height of the corresponding point of the laser ranging assembly at different angles © based on the change in distance of the corresponding point measured by the laser ranging assembly at different angles 6; step h: real-time curve of the bridge deck height change with the bridge deck position is plotted according to the calculation results for monitoring the height change of the bridge deck.
7. The method for monitoring the height of bridge deck based on laser ranging according to claim 1, which is characterized in that the installation location A in step a can be located at the top of the bridge tower, the top of a super tall building near the bridge or the top of a hill near the bridge.
8. The method for monitoring the height of bridge deck based on laser ranging according to claim 1, which is characterized in that the tilt angle 6 of all laser ranging assemblies in step d and step e is adjusted by the whole first gear set, and the tilt angle 6 of individual laser ranging assemblies is adjusted by the second gear set.
LU500241A 2020-06-10 2020-10-10 Device and method for monitoring the height of bridge deck based on laser ranging LU500241B1 (en)

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