Beam body linear monitoring device for bridge demolition

Abstract

The utility model discloses a beam body linear monitoring device for bridge demolition, which comprises a mounting mechanism, a receiver, a horizontal moving mechanism and an emitter structure, the horizontal moving mechanism is connected with a beam body through the mounting mechanism, and the horizontal moving mechanism is used for horizontally moving along the transverse bridge direction of the beam body; the horizontal moving mechanism is arranged on the beam body, the transmitter structure is arranged on the horizontal moving mechanism and can rotate in the horizontal direction or / and the vertical direction, the receiver is arranged on the beam body and used for receiving signals of the transmitter structure, and the receiver and the transmitter structure are both in communication connection with the PC terminal; according to the utility model, the monitoring device is not limited by the surrounding environment; and the horizontal moving mechanism is matched with the emitter structure, so that the linear change of the bridge body in the bridge demolition process can be accurately measured.

Description

Technical Field

[0001] The utility model relates to the technical field of beam linear monitoring, in particular to a beam linear monitoring device used for bridge demolition. Background Art

[0002] During the process of bridge repair, replacement or reconstruction, the demolition of old bridges is a crucial step. During the demolition process, the alignment monitoring of the bridge beam is crucial to ensure the demolition process is carried out safely and efficiently.

[0003] The existing bridge beam linear measurement can be carried out by the following methods:

[0004] Direct measurement using a dial indicator or displacement meter requires stringing steel wires or setting up scaffolding at each measuring point on the beam bottom. This direct measurement method is complex and time-consuming, both for instrument placement and removal. It is also difficult to apply to river-spanning bridges, overpasses, and high-altitude bridges.

[0005] Using a level to measure the height difference between two points is simple, but its accuracy is low, and it's also difficult to place a level rod during bridge demolition. A total station can address this shortcoming, but when measuring a bridge deep in a mountain valley, there may not be a suitable location nearby to place the instrument.

[0006] Using a static level based on the interconnecting tube principle, the vertical displacement of a bridge is directly measured based on the changes in the liquid level within the connected tube. However, for large bridge spans or with a large number of measurement points, the viscous resistance between the liquid and the tube wall can reduce measurement accuracy. Furthermore, the cutting and lowering of beams during bridge demolition can affect the integrity of the inspection process, leading to measurement errors.

[0007] Based on the above technical problems, it is necessary for technicians in this field to develop a beam linear monitoring device during bridge demolition to monitor the linear changes of the beam in real time. Utility Model Content

[0008] The purpose of the utility model is to provide a beam linear monitoring device for bridge demolition, which solves the problem in the prior art that beam linear measurement during bridge demolition cannot simultaneously meet measurement accuracy and application scenarios.

[0009] The utility model is realized as follows: a beam linear monitoring device for bridge demolition includes a mounting mechanism, a receiver, a horizontal movement mechanism and a transmitter structure.

[0010] The horizontal movement mechanism is connected to the beam body through a mounting mechanism, and the horizontal movement mechanism is used to move horizontally along the transverse direction of the beam body;

[0011] The launcher structure is placed on the horizontal moving mechanism, and the launcher structure can rotate in the horizontal direction and / or vertical direction.

[0012] The receiver is placed on the beam and is used to receive signals from the transmitter structure. Both the receiver and the transmitter structure are communicatively connected to the PC end.

[0013] In the present invention, the monitoring device is connected to the beam through a mounting mechanism, wherein one end of the mounting mechanism is above the beam and the other end is below the beam, and the end of the mounting mechanism placed below the beam is connected to the horizontal moving mechanism, which is suspended below the beam and is therefore not restricted by the surrounding environment; moreover, the transmitter structure is placed at the moving end of the horizontal moving mechanism, which can move horizontally along the transverse direction of the beam, and the transmitter structure can rotate in the horizontal direction or / and vertical direction, and the horizontal moving mechanism drives the transmitter structure to just below the designated initial test point at the bottom of the beam, and the horizontal rotation of the transmitter structure can be used to measure the periphery centered on the transmitter structure. In order to further improve the accuracy, the transmitter structure can also rotate in the vertical direction to adjust the angle of the transmitter body, thereby accurately completing the test of different test points. The horizontal moving mechanism cooperates with the transmitter structure, so that the linear changes of the beam during the bridge demolition process can be accurately measured.

[0014] A further technical solution of the present invention is that the receiver is arranged along the longitudinal bridge direction of the bottom of the beam body.

[0015] The arrangement of the receivers can effectively monitor the linear shape of the beam.

[0016] A further technical solution of the present utility model is: the launcher structure includes a launcher body, a mounting base, a drive system, a first bevel gear and a gear assembly; the drive system is connected to the mounting base for driving the mounting base to rotate and lift; the launcher body is rotationally connected to the mounting base; the first bevel gear is fixed in position and meshes with the gear assembly; the gear assembly is placed above the first bevel gear and connected to the launcher body.

[0017] The transmitter body can be rotated in the horizontal direction through the drive system. In conjunction with the first bevel gear and the gear assembly, the angle of the transmitter body can be adjusted while the transmitter body rotates. In order to further ensure the monitoring accuracy of the transmitter body, the first bevel gear and the gear assembly can be disengaged so that the transmitter body can only rotate in the horizontal direction.

[0018] A further technical solution of the present invention is: the gear assembly includes a second bevel gear and a spur gear set, the second bevel gear is meshed with the first bevel gear, the spur gear set and the second bevel gear are connected through a coupling, and the output shaft of the spur gear member is connected to the transmitter body through the mounting seat.

[0019] When the second bevel gear rotates, the shaft of the spur gear set is driven to rotate through the coupling, thereby driving the spur gear set to rotate. The rotation of the spur gear set drives the transmitter body to rotate on the mounting base, thereby realizing the rotation of the transmitter body on the vertical plane, so that the transmitter body can align with the receiver to transmit signals, and the monitoring results are more accurate.

[0020] A further technical solution of the present invention is that the mounting seat is a U-shaped structure, the transmitter body is placed in the U-shaped groove, and the gear assembly is placed on the U-shaped wall.

[0021] The launcher body can rotate relative to the mounting base on a vertical plane, thereby adjusting the tilt angle of the launch end of the launcher body.

[0022] A further technical solution of the present invention is: the driving system includes a motor group and a connecting block connected to the output end of the motor group, and the connecting block is connected to the mounting seat.

[0023] A connecting block is provided at the output end of the motor group, and the connecting block is connected to the mounting seat. When the motor group drives the connecting block to rotate or lift, the connecting block drives the mounting seat to rotate or lift.

[0024] A further technical solution of the present invention is that: a support column for fixing the position of the first bevel gear is provided on the driving system.

[0025] A support column is provided on the fixed end of the driving system, and the first bevel gear is sleeved on the output shaft of the driving system and is fixed in position by the support column.

[0026] A further technical solution of the present invention is: the horizontal movement mechanism includes a mounting plate, a connecting plate, a guide rod, a worm, a motor and a support plate, the connecting plates are multiple and are placed between the mounting plate and the support plate, the guide rod and the worm are arranged in parallel and pass through the support plate, the connecting plate and the mounting plate in sequence, and the motor is connected to the worm for horizontal movement of the support plate.

[0027] The motor drives the screw to rotate, and the distance between the connecting plates increases or decreases, thereby causing the support plate to move in the horizontal direction, driving the transmitter structure on the support plate to move horizontally.

[0028] A further technical solution of the present invention is: the support plate is used to install the transmitter structure.

[0029] A further technical solution of the present invention is: the installation mechanism includes a base and a mounting frame, the base is fixed to the top of the beam, and two ends of the mounting frame are respectively connected to the base and the horizontal moving mechanism below the beam.

[0030] The beneficial effects of the present invention are as follows: In the present invention, the monitoring device is connected to the beam through an installation mechanism, wherein one end of the installation mechanism is above the beam and the other end is below the beam, and the end of the installation mechanism placed below the beam is connected to the horizontal moving mechanism, which is suspended below the beam and is therefore not restricted by the surrounding environment; moreover, the transmitter structure is placed at the moving end of the horizontal moving mechanism, which can move horizontally along the transverse direction of the beam, and the transmitter structure can rotate in the horizontal direction or / and vertical direction, and the horizontal moving mechanism drives the transmitter structure to just below the designated initial test point at the bottom of the beam, and the horizontal rotation of the transmitter structure can be used to measure the surrounding area centered on the transmitter structure. In order to further improve the accuracy, the transmitter structure can also rotate in the vertical direction to adjust the angle of the transmitter body, thereby accurately completing the test of different test points. The horizontal moving mechanism cooperates with the transmitter structure, so that the linear changes of the beam during the bridge demolition process can be accurately measured.

[0031] In response to the shortcomings of the existing technology, the monitoring device of the present invention can achieve horizontal movement in the transverse direction of the bridge, and can control the rotation and vertical rotation of the laser transmitter. By using the receiver to obtain distance information, the height difference of the measuring points of each section of the beam during the demolition process can be calculated, thereby monitoring the linear changes of the beam during the bridge demolition process in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of a beam linear monitoring device for bridge demolition provided by the utility model;

[0033] Figure 2 It is a structural diagram of the installation mechanism provided by the utility model;

[0034] Figure 3 It is a structural diagram of the horizontal moving mechanism provided by the utility model;

[0035] Figure 4 This is an exploded view of the transmitter structure provided by the utility model;

[0036] Figure 5 This is a layout diagram of the receiver at the bottom of the beam provided by the present invention;

[0037] Figure 6 This is a schematic diagram of the height difference measurement principle of the longitudinal bridge-direction measuring point at the bottom of the beam provided by the utility model;

[0038] Figure 7 It is a schematic diagram of the height difference measurement principle of the transverse bridge direction measuring point at the bottom of the beam body provided by the utility model.

[0039] Reference numerals:

[0040] 1. Mounting mechanism, 11. Base, 12. Mounting frame,

[0041] 2. Receiver,

[0042] 3. Horizontal moving mechanism, 31. Mounting plate, 32. Connecting plate, 33. Guide rod, 34. Worm, 35. Motor, 36. Support plate, 37. Second connecting piece, 38. First connecting piece, 39. Support slot,

[0043] 4. Transmitter structure, 41. Transmitter body, 42. Mounting base, 421. Rectangular slot, 43. Drive system, 431. Motor unit, 432. Connecting block, 44. First bevel gear, 45. Gear assembly, 451. Second bevel gear, 452. Spur gear set, 453. Output shaft, 46. Coupling, 47. Support column,

[0044] 5. Beam body,

[0045] X. Horizontal bridge direction, Y. Longitudinal bridge direction. DETAILED DESCRIPTION

[0046] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0047] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0048] Example 1:

[0049] Figure 1-7 The invention shows a beam linear monitoring device for bridge demolition, comprising a mounting mechanism 1, a receiver 2, a horizontal movement mechanism 3 and a transmitter structure 4.

[0050] The horizontal moving mechanism 3 is connected to the beam body through the mounting mechanism 1, and the horizontal moving mechanism 3 is used to move horizontally along the transverse direction of the beam body;

[0051] The launcher structure 4 is placed on the horizontal moving mechanism 3, and the launcher structure 4 can rotate in the horizontal direction and / or vertical direction.

[0052] The receiver 2 is placed on the beam and is used to receive signals from the transmitter structure 4. Both the receiver 2 and the transmitter structure 4 are communicatively connected to the PC end.

[0053] In the present invention, the monitoring device is connected to the beam through a mounting mechanism, wherein one end of the mounting mechanism is above the beam and the other end is below the beam, and the end of the mounting mechanism placed below the beam is connected to the horizontal moving mechanism, which is suspended below the beam and is therefore not restricted by the surrounding environment; moreover, the transmitter structure is placed at the moving end of the horizontal moving mechanism, which can move horizontally along the transverse direction of the beam, and the transmitter structure can rotate in the horizontal direction or / and vertical direction, and the horizontal moving mechanism drives the transmitter structure to just below the designated initial test point at the bottom of the beam, and the horizontal rotation of the transmitter structure can be used to measure the periphery centered on the transmitter structure. In order to further improve the accuracy, the transmitter structure can also rotate in the vertical direction to adjust the angle of the transmitter body, thereby accurately completing the test of different test points. The horizontal moving mechanism cooperates with the transmitter structure, so that the linear changes of the beam during the bridge demolition process can be accurately measured.

[0054] In this embodiment, the receiver 2 is arranged along the longitudinal bridge direction of the bottom of the beam body.

[0055] The arrangement of the receivers can effectively monitor the linear shape of the beam.

[0056] In this embodiment, the receiver is arranged along the longitudinal bridge direction along the center line of the bottom of the beam body, and a receiver arranged along the longitudinal bridge direction is also provided on one side of the bottom of the beam body close to the installation mechanism.

[0057] In this embodiment, the launcher structure 4 includes a launcher body 41, a mounting base 42, a drive system 43, a first bevel gear 44 and a gear assembly 45. The drive system 43 is connected to the mounting base 42 for driving the mounting base 42 to rotate and lift. The launcher body 41 is rotatably connected to the mounting base 42. The first bevel gear 44 is fixed in position and meshes with the gear assembly 45. The gear assembly 45 is placed above the first bevel gear 44 and connected to the launcher body 41.

[0058] The transmitter body can be rotated in the horizontal direction through the drive system. In conjunction with the first bevel gear and the gear assembly, the angle of the transmitter body can be adjusted while the transmitter body rotates. In order to further ensure the monitoring accuracy of the transmitter body, the first bevel gear and the gear assembly can be disengaged so that the transmitter body can only rotate in the horizontal direction.

[0059] In this embodiment, the gear assembly 45 includes a second bevel gear 451 and a spur gear set 452. The second bevel gear 451 is meshed with the first bevel gear 44. The spur gear set 452 is connected to the second bevel gear 451 through a coupling 46. The output shaft 453 of the spur gear 452 passes through the mounting seat 42 and is connected to the transmitter body 41.

[0060] When the second bevel gear rotates, the shaft of the spur gear set is driven to rotate through the coupling, thereby driving the spur gear set to rotate. The rotation of the spur gear set drives the transmitter body to rotate on the mounting base, thereby realizing the rotation of the transmitter body on the vertical plane, so that the transmitter body can align with the receiver to transmit signals, and the monitoring results are more accurate.

[0061] In this embodiment, the spur gear set includes two meshing spur gears, one of which is connected to the second bevel gear via a coupling, and the shaft of the other spur gear passes through the mounting seat and is connected to the transmitter body.

[0062] In this embodiment, the mounting base 42 is a U-shaped structure, the transmitter body 41 is placed in the U-shaped groove, and the gear assembly 45 is placed on the U-shaped wall.

[0063] The launcher body can rotate relative to the mounting base on a vertical plane, thereby adjusting the tilt angle of the launch end of the launcher body.

[0064] In this embodiment, the driving system 43 includes a motor group 431 and a connecting block 432 connected to an output end of the motor group 431 , and the connecting block 432 is connected to the mounting base 42 .

[0065] A connecting block is provided at the output end of the motor group, and the connecting block is connected to the mounting seat. When the motor group drives the connecting block to rotate or lift, the connecting block drives the mounting seat to rotate or lift.

[0066] In this embodiment, the motor group is used to drive the connecting block to rotate and lift.

[0067] In this embodiment, the shaft of the motor group passes through the first bevel gear and is connected to the mounting base via a connecting block. When the motor group drives the mounting base to rise, the first bevel gear is disengaged from the gear assembly.

[0068] In this embodiment, a support column 47 is provided on the driving system 43 for fixing the position of the first bevel gear 44 .

[0069] A support column is provided on the fixed end of the driving system, and the first bevel gear is sleeved on the output shaft of the driving system and is fixed in position by the support column.

[0070] In this embodiment, the horizontal movement mechanism 3 includes a mounting plate 31, a connecting plate 32, a guide rod 33, a worm 34, a motor 35 and a support plate 36. The connecting plates 32 are multiple and are placed between the mounting plate 31 and the support plate 36. The guide rod 33 and the worm 34 are arranged in parallel and pass through the support plate 36, the connecting plate 32 and the mounting plate 31 in sequence. The motor 35 is connected to the worm 34 for horizontal movement of the support plate 36.

[0071] The motor drives the screw to rotate, and the distance between the connecting plates increases or decreases, thereby causing the support plate to move in the horizontal direction, driving the transmitter structure on the support plate to move horizontally.

[0072] In this embodiment, one end of the guide rod is connected to the mounting plate and the other end is connected to the support groove, and the worm is placed between the guide rods. Therefore, during the rotation of the worm, the distance between the connecting plates changes, thereby realizing horizontal movement of the support plate.

[0073] In this embodiment, the horizontal movement mechanism also includes a first connecting member 38, a second connecting member 37 and a support groove 39. The support groove 39 is connected to the end of the support plate 36 away from the connecting plate 32 and is used to place the motor 35. The second connecting member 37 is connected to the connecting plate 32 and the second connecting members 37 are connected through the first connecting member 38. The first connecting member 38 and the second connecting member 37 constitute a connecting rod mechanism.

[0074] In this embodiment, the support plate 36 is used to install the transmitter structure 4 .

[0075] In this embodiment, the mounting mechanism 1 includes a base 11 and a mounting frame 12. The base 11 is fixed to the top of the beam, and both ends of the mounting frame 12 are respectively connected to the base 11 and the horizontal moving mechanism 3 below the beam.

[0076] In this embodiment, the PC controls the transmitter body 41 to transmit a signal to the receiver 2. The time difference between the receiver 2 receiving the signal and the transmitter body 41 transmitting the signal can be used to calculate the distance between the receiver and the laser transmitter.

[0077] Device installation: First, place the base 11 on the bridge span beam 5 to be measured, and assemble and fix the base 11 and the horizontal moving mechanism 3 through the mounting frame 12. Then use the bridge inspection vehicle to transport the remaining device components to the starting measuring point for installation. During installation, first fix the mounting frame 12 and the mounting plate 31 in the horizontal moving mechanism 3, then insert the worm 34 and the guide rod 33 into the corresponding holes of the mounting plate 31, and put a number of connecting plates 32, support plates 36 and support grooves 39 on the worm 34 and the guide rod 33, and the worm 34 is connected to the first motor 35. Then, assemble and fix a number of first connecting members 38 and second connecting members 37 on the corresponding mounting plates 31, connecting plates 32 and support plates 36 as shown. Figure 3 As shown. Then the transmitter structure 4 is installed, and the transmitter body 41 is connected to the mounting seat 42 through the rotating shaft. The rotating shaft passes through the mounting seat 42 and is connected to the spur gear set 452. The spur gear set 452 is placed on the mounting seat 42 and is connected to the second bevel gear 451 through the coupling 47. Among them, the spur gear set 452 includes two spur gears that mesh with each other, and the second bevel gear 451 and the first bevel gear 44 mesh with each other. The output end of the drive system 43 is connected to the connecting block 432 through the first bevel gear 44. The connecting block 432 is inserted into the rectangular groove 421 at the bottom of the mounting seat 42. The first bevel gear 44 is placed on the housing of the drive system 431 through the support column 47 to fix the first bevel gear 44. After the transmitter structure 4 is installed, it is placed on the support plate 36. After the assembly of the entire device is completed, the measuring points are divided along the center line of the bottom of the bridge beam and the right edge line in the longitudinal direction of the bridge span to be measured. The distance between adjacent measuring points on each line is d, and the starting measuring point and the ending measuring point are set at the pier positions on both sides. Press Figure 5 The method shown in the figure is to place several receivers 2 along the center line of the bottom of the beam at positions O1 to O2 by a bridge inspection vehicle. n The measuring point is set up at B1 to B2 along the right edge of the bottom of the beam. n Measuring point.

[0078] Working principle: Start the first motor 35 to rotate the worm 34, which drives the horizontal movement of the support plate 36 through the first connecting members 38 and the second connecting members 37, and moves the transmitter structure 4 placed on the support plate 36 to the initial measuring point O1 directly below the receiver 2, and then turns off the first motor 35. Then start the motor group 431 to rotate the connecting block 432, driving the transmitter body 41 and the mounting base 42 to rotate horizontally, while indirectly driving the second bevel gear 451 to rotate horizontally around the center of the first bevel gear 44. Since the first bevel gear 44 is fixed, the second bevel gear 451 rotating horizontally around the center of the first bevel gear 44 will produce self-rotation at this time, and then drive the spur gear group 45 to rotate through the coupling 47, thereby driving the transmitter body 41 to rotate in the vertical direction. In addition, the motor group 431 can also be used to control the connection block 432 to move upward, so that the second bevel gear 451 and the first bevel gear 44 are no longer in contact. At this time, the transmitter body 41 only rotates horizontally, achieving a secondary adjustment of the launch angle of the transmitter body 41, so that the transmitter body 41 can accurately aim at the receiver at different measuring points to launch the laser. By measuring the time difference between transmission and reception, the distance a between the receiver and the laser transmitter is calculated. m .

[0079] use Figure 6 The principle shown can calculate the height difference of the Y measuring point at the bottom of the beam in the longitudinal direction of the bridge. m The distance between a1 and a m ) can be measured by the transmitter structure 4, (m-1)d is an arbitrary measurement point O m The distance to the initial measuring point O1 (known), according to the Pythagorean theorem, satisfies formula 1, then any longitudinal measuring point O at the bottom of the beam m Height difference b from the initial measuring point O1 m , see formula 2.

[0080] (a m ) 2 =((m-1)d) 2 +(a1-b m ) 2 Formula 1

[0081]

[0082] use Figure 7 The principle shown can calculate the height difference of the X measuring point at the bottom of the beam in the transverse direction of the bridge. m Distance b m It can be measured by the transmitter structure 4. The size of (m-1)d is known. According to the Pythagorean theorem, the right triangle A1A m B m The other side A m Bm The length b′ m See formula 3; and because triangle O m A m B m Medium O m A m The length of a1-b m According to Figure 6 Method calculation, O m B m The length c is half of the width of the bottom of the beam (known), and according to the triangle cosine theorem formula 4, we can get O m A m With O m B m The angle α m , see formula 5, then triangle O m O m B′ m Medium O m B m With O m B′ m The angle β m =α m -90°, then any horizontal measuring point O at the bottom of the beam m With B m Height difference c m =c sinβ m , m = 1, ..., n. Repeat the above method, and use the values ​​of the parameters returned by the PC-side receiver 2 to calculate the height difference between the measuring points at the bottom of the beam. Further fitting can obtain the overall linear shape of the bridge beam to be measured.

[0083]

[0084] (b′ m ) 2 =(a1-b m ) 2 +c 2 -2(a1-b m )ccosα m Formula 4

[0085]

[0086] Because the horizontal position of the transmitter structure 4 can be adjusted by motor 35, this device is applicable to bridges of varying widths. When this device is used in bridge girder removal construction, multiple measuring points can be arranged horizontally at the bottom of the girder. By detecting the vertical height difference between the measuring points in each girder segment before and after removal, changes in the girder's linear shape can be monitored in real time throughout the entire bridge demolition process.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A beam linear monitoring device for bridge demolition, characterized in that: It includes a mounting mechanism (1), a receiver (2), a horizontal movement mechanism (3) and a transmitter structure (4), The horizontal movement mechanism (3) is connected to the beam body via the mounting mechanism (1), and the horizontal movement mechanism (3) is used for horizontal movement along the transverse direction of the beam body; The launcher structure (4) is placed on the horizontal moving mechanism (3), and the launcher structure (4) can rotate in the horizontal direction and / or the vertical direction. The receiver (2) is placed on the beam and is used to receive signals from the transmitter structure (4). Both the receiver (2) and the transmitter structure (4) are communicatively connected to the PC end.

2. The beam linear monitoring device for bridge demolition according to claim 1, characterized in that: The receiver (2) is arranged along the longitudinal bridge direction of the bottom of the beam body.

3. The device for monitoring the linear shape of a beam for bridge demolition according to claim 1, characterized in that: The transmitter structure (4) comprises a transmitter body (41), a mounting seat (42), a driving system (43), a first bevel gear (44) and a gear assembly (45); the driving system (43) is connected to the mounting seat (42) for driving the mounting seat (42) to rotate and lift; the transmitter body (41) is rotationally connected to the mounting seat (42); the first bevel gear (44) is fixed in position and meshes with the gear assembly (45); the gear assembly (45) is placed above the first bevel gear (44) and connected to the transmitter body (41).

4. The device for monitoring the linear shape of a beam for bridge demolition according to claim 3, characterized in that: The gear assembly (45) includes a second bevel gear (451) and a spur gear set (452). The second bevel gear (451) is meshed with the first bevel gear (44). The spur gear set (452) is connected to the second bevel gear (451) via a coupling (46). The output shaft (453) of the spur gear set (452) passes through a mounting seat (42) and is connected to the transmitter body (41).

5. The device for monitoring the linear shape of a beam for bridge demolition according to claim 3, characterized in that: The mounting seat (42) is a U-shaped structure, the transmitter body (41) is placed in the U-shaped groove, and the gear assembly (45) is placed on the U-shaped wall.

6. The device for monitoring the linear shape of a beam for bridge demolition according to claim 3, characterized in that: The driving system (43) comprises a motor group (431) and a connecting block (432) connected to the output end of the motor group (431), wherein the connecting block (432) is connected to the mounting seat (42).

7. The device for monitoring the linear shape of a beam for bridge demolition according to claim 3, characterized in that: A support column (47) for fixing the position of the first bevel gear (44) is provided on the driving system (43).

8. The device for monitoring the linear shape of a beam for bridge demolition according to claim 1, characterized in that: The horizontal movement mechanism (3) comprises a mounting plate (31), a connecting plate (32), a guide rod (33), a worm (34), a motor (35) and a support plate (36); the connecting plates (32) are multiple and are placed between the mounting plate (31) and the support plate (36); the guide rod (33) and the worm (34) are arranged in parallel and pass through the support plate (36), the connecting plate (32) and the mounting plate (31) in sequence; the motor (35) is connected to the worm (34) for horizontal movement of the support plate (36).

9. The device for monitoring the linear shape of a beam for bridge demolition according to claim 8, characterized in that: The support plate (36) is used to mount the emitter structure (4).

10. The beam linear monitoring device for bridge demolition according to claim 1, characterized in that: The mounting mechanism (1) comprises a base (11) and a mounting frame (12); the base (11) is fixed to the top of the beam; and the two ends of the mounting frame (12) are respectively connected to the base (11) and the horizontal moving mechanism (3) below the beam.

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