Foldable auxiliary marking tape set for large-span bridge spatial form scanning

Abstract

The application discloses a folding auxiliary marking tape group for large-span bridge space form scanning, each marking tape group comprising a plurality of marking tape devices of the same structural unit, each marking tape device comprising a marking tape, a first rotating connecting piece, a flip cover, a second rotating connecting piece and a fixing support, the marking tape being connected with the first rotating connecting piece, the first rotating connecting piece being fixed on the lower surface of the flip cover, one end of the second rotating connecting piece being fixed on the side surface of the flip cover and the other end being fixed on the fixing support, the fixing support being installed on a steel plate, and the steel plate being arranged between the main girder bottom plate of the large-span bridge and the I-beam of the inspection vehicle track beam. The marking tape is installed on the steel plate of the main girder bottom plate of the large-span bridge, the inclination angle of the marking tape can be adjusted, more reflection surfaces with better reflection effect and smaller incidence angle are provided for incident laser, the intensity loss of the incident laser is smaller, and the quality of the scanning points of the three-dimensional laser scanner is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge spatial form measurement, in particular to a folding auxiliary marker tape set for large-span bridge spatial form scanning. BACKGROUND

[0002] In the measurement process of the spatial form of a large-span bridge, a three-dimensional laser scanner determines the spatial position of a target point on the bridge in a three-dimensional spherical coordinate system by measuring the angle of the emitted light and the time of the reflected light in real time, and converts it to a three-dimensional rectangular coordinate system. Compared with the single-point measurement of traditional surveying instruments, the three-dimensional laser scanner has the advantages of high speed, precision, and massiveness.

[0003] Existing large-span bridges often have a pre-camber, which is manifested as low on both sides and high in the middle. At a long distance, the bridge bottom surface and the incident laser light may even be nearly parallel. Since large-span bridges usually need to cross rivers or valleys, it is not possible to set up a measurement station near the middle of the bridge when measuring the bridge form, so the measurement station can only be set up at the two ends of the bridge. The pre-camber brings a large increase in the incident angle for the three-dimensional laser scanner set up at the two ends of the bridge. For a three-dimensional laser scanner, the best incident angle is 0 degrees. As the incident angle increases, the quality of the scanning points gradually decreases. When the incident angle is greater than 60 degrees, the decline rate increases sharply, and an incident angle close to 90 degrees greatly reduces the reflection intensity of the laser, thereby greatly reducing the scanning range and accuracy of the three-dimensional laser scanner. The three-dimensional laser scanner obtains the coordinates of the target point by relying on the reflection intensity of the laser, and the reflection intensity of the laser is related to the incident angle of the laser and the color of the target. The rough, gray surface of a concrete bridge and the grayish white surface of a steel bridge do not have good reflection effects on the laser, further reducing the reflection intensity of the laser.

[0004] The existing marker tape set that receives and reflects laser light generally adds a reflection angle to reduce the incident angle of the laser, and is installed relying on the steel rails of a bridge inspection vehicle. This structure has the disadvantages of complex structure, easy damage, and high requirements for bridge supporting facilities, and is difficult to apply to general bridge measurement environments. SUMMARY

[0005] The present application aims to provide a folding auxiliary marker tape set for large-span bridge spatial form scanning.

[0006] Technical solution: The folding auxiliary marking tape group for large-span bridge spatial form scanning comprises a plurality of marking tape devices of the same structure unit, each marking tape device comprises a marking tape, a first rotating connecting piece, a flip, a second rotating connecting piece and a fixing support, the marking tape is connected with the first rotating connecting piece, the first rotating connecting piece is fixed on the lower surface of the flip, one end of the second rotating connecting piece is fixed on the side surface of the flip, and the other end is fixed on the fixing support, the fixing support is installed on a steel plate, and the steel plate is arranged between the main beam bottom plate of the large-span bridge and the I-beam of the maintenance vehicle track.

[0007] Further, the marking tape is a white rectangular plastic plate, and the surface is frosted to increase the roughness of the marking tape.

[0008] Further, the flip comprises a metal plate and a rubber magnet, the metal plate comprises a first metal plate and a second metal plate, the first metal plate and the second metal plate are connected through a second connecting bolt, the angle between the two metal plates is adjustable, the rubber magnet is arranged on the upper surface of the first metal plate, the marking tape is adsorbed to the surface of the bridge through the rubber magnet, and the second metal plate is vertically arranged.

[0009] Further, the second rotating connecting piece comprises connecting plates at both ends, a first connecting plate is fixed on the fixing support through a third fixing bolt, and a second connecting plate is fixed on the second metal plate through a second fixing bolt; a connecting rod and a rotating groove are arranged between the two connecting plates in the axial direction, the connecting rod and the rotating groove are cylindrical, the rotating groove is hollow, one end of the rotating groove is sleeved outside the connecting rod, the rotating groove is fixed on the connecting rod through a bolt, and the rotating groove rotates along the connecting rod; the other end of the rotating groove is fixed on the end face of the second connecting plate.

[0010] Further, the first rotating connecting piece is fixed on the lower surface of the flip through a first fixing bolt, two clamping grooves are arranged on the first rotating connecting piece, and a first connecting bolt is arranged between the two clamping grooves.

[0011] Further, the fixing support comprises a vertical fixing baffle, one end of the fixing baffle is fixed with a third connecting plate through a fourth fixing bolt, a movable baffle is arranged in parallel with the fixing baffle, and the movable baffle is fixed on the fixing baffle through a limiting bolt.

[0012] Advantages: Compared with the prior art, the present application has the following advantages:

[0013] 1. The marking tape is installed on the steel plate of the main beam bottom plate of the large-span bridge, the inclination angle of the marking tape can be adjusted, more reflection surfaces with better reflection effect and smaller incidence angle are provided for incident laser, the intensity loss of the incident laser is smaller, and the quality of the scanning points of the three-dimensional laser scanner is improved.

[0014] 2、The present application realizes the change of the three-dimensional position of the marking tape by rotating the rotating groove and the first metal plate, and can adjust the marking tape to tightly adhere to the bridge bottom for different bridge bottom conditions, better assists the measurement of the three-dimensional laser scanner, and achieves the best reflection effect. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the general assembly drawing of the present application;

[0016] Figure 2 is the local enlarged view of the marking tape of the present application;

[0017] Figure 3 is the local enlarged view of the first rotating connecting piece of the present application;

[0018] Figure 4 is the local enlarged view of the flip cover of the present application;

[0019] Figure 5 is the local enlarged view of the second rotating connecting piece of the present application;

[0020] Figure 6 is the local enlarged view of the fixed support of the present application;

[0021] Figure 7 is the longitudinal bridge installation layout when the present application is applied to a large-span bridge. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples.

[0023] The folding auxiliary marking tape group for large-span bridge spatial form scanning described in the present embodiment includes a plurality of marking tape devices of the same structure unit, such as the marking tape device shown in Figure 1 Each marking tape device includes a marking tape 1, a first rotating connecting piece 2, a flip cover 3, a second rotating connecting piece 4 and a fixed support 5, the marking tape 1 is connected with the first rotating connecting piece 2, as shown in Figure 2 The first rotating connecting piece 2 is fixed on the lower surface of the flip cover 3, one end of the second rotating connecting piece 4 is fixed on the side surface of the flip cover 3, and the other end is fixed on the fixed support 5, the fixed support 5 is installed on the steel plate 7, and the steel plate 7 is arranged between the main girder bottom plate of the large-span bridge and the I-beam 6 of the maintenance car track beam.

[0024] The marking tape 1 is a white rectangular plastic plate, and the surface is frosted to increase the roughness of the marking tape 1.

[0025] As shown in Figure 3As shown, the first rotating connecting piece 2 is fixed to the lower surface of the cover 3 by the first fixing bolt 10, the first rotating connecting piece 2 is provided with two clamping grooves 8, and the first connecting bolt 9 is arranged between the two clamping grooves 8.

[0026] As shown in the drawings, Figure 4 The cover 3 comprises a metal plate 12 and a rubber magnet 11, the metal plate 12 comprises a first metal plate and a second metal plate, the second metal plate is arranged vertically, the first metal plate and the second metal plate are connected by the second connecting bolt 13, the angle between the two metal plates is adjustable, when the first metal plate reaches the appropriate angle, the first metal plate is fixed to the second metal plate by tightening the second connecting bolt 13. The rubber magnet 11 is arranged on the upper surface of the first metal plate, and the marking tape 1 is adsorbed to the surface of the bridge by the rubber magnet 11.

[0027] As shown in the drawings, Figure 5 The second rotating connecting piece 4 is fixed to the second metal plate, the two ends of the second rotating connecting piece 4 comprise connecting plates, the first connecting plate 19 is fixed to the fixed support 5 by the third fixing bolt 20, the second connecting plate 14 is fixed to the second metal plate by the second fixing bolt 15, the connecting rod 18 and the rotating groove 16 are arranged between the two connecting plates in the axial direction, the connecting rod 18 and the rotating groove 16 are cylindrical, the rotating groove 16 is hollow, one end of the rotating groove 16 is sleeved outside the connecting rod 18, the rotating groove 16 rotates along the connecting rod 18, thereby driving the rotation of the second metal plate, when rotating to the appropriate position, the rotating groove 16 is fixed to the connecting rod 18 by the bolt 17; the other end of the rotating groove 16 is fixed to the end face of the second connecting plate 14.

[0028] As shown in the drawings, Figure 6 The fixed support 5 comprises a fixed baffle 23 arranged vertically, one end of the fixed baffle 23 is fixed with a third connecting plate 21 by the fourth fixing bolt 22, the movable baffle 24 is arranged parallel to the fixed baffle 23, and the movable baffle 24 is fixed to the fixed baffle 23 by the limiting bolt 25.

[0029] In order to verify the effect of the marking tape device, the marking tape group of the present application is actually applied to a large-span bridge main beam scanning project, as shown in the drawings, Figure 7The marking tape group is provided with 40 marking tape devices, which are symmetrically distributed at intervals of 10 meters along the longitudinal bridge at the bridge span 1 / 2 position, so as to improve the scanning range of the three-dimensional laser scanner on the spatial form of the long-span bridge. The marking tape 1 is a white rectangular plastic plate, the surface of which is ground, and the size is: 20 cm long, 1 cm wide and 5 mm thick. The plastic plates are connected by connecting bolts, and the ends of the connecting bolts are provided with nuts. The size of the two metal plates is: 12 cm long and 4 cm wide. The two metal plates are connected by connecting bolts, and the angle between the two metal plates is fixed by rotating one of the metal plates and tightening the connecting bolts. The first connecting plate 19 and the second connecting plate 14 are square plates with a side length of 1.2 cm. The inner diameter of the rotating groove 16 is 6 mm, and the diameter of the connecting rod 18 is 6 mm. The rotating groove 16 and the connecting rod 18 are connected in cooperation. The rotating groove 16 is fixed on the connecting rod 18 by using the bolt 17 when the second connecting plate 14 is turned to the appropriate position. The size of the third connecting plate 21 in the fixed support 5 is: 10 cm wide and 4 cm long. The size of the fixed baffle 23 is: 24 cm long and 8 cm wide. The size of the movable baffle 24 is: 24 cm long and 8 cm wide. The marking tape 1 is fixed on the bottom surface of the main beam by the support of the fixed support 5 and the adsorption of the rubber magnet 11. The fixed support 5 is supported on the steel plate 7 between the main beam bottom plate of the long-span bridge and the I-steel 6 of the inspection vehicle track beam. The rubber magnet 11 is adsorbed on the steel bridge bottom.

[0030] The installation process of the marking tape 1 is as follows: first, select the position to be installed, and clamp the fixed baffle 23 in the fixed support 5 on the steel plate 7 above the I-steel 6 of the long-span bridge main beam bottom plate and the inspection vehicle track beam; then align the movable baffle 24 with the fixed baffle 23 and tighten the limiting bolt 25 to clamp the fixed support 5 on the steel plate 7; then install the second rotating connecting piece 4 on the fixed support 5 through the third fixed bolt 20, and connect it with the flip cover 3 through the second fixed bolt 15; then fix the first rotating connecting piece 2 on the flip cover 3 through the first fixed bolt 10; finally, connect the marking tape 1 with the first rotating connecting piece 2 through the first connecting bolt 9; finally, fine-tune the first rotating connecting piece 2, the flip cover 3 and the second rotating connecting piece 4, so that the rubber magnet 11 is tightly attached to the bottom surface of the main beam, and then the marking tape 1 is tightly attached to the bottom surface of the bridge.

[0031] The working principle of the above-mentioned auxiliary target for accurately scanning the main beam at the bottom of the bridge body from a long distance is as follows: the marking tape device is installed on the steel plate in the span of the long-span bridge. According to the position of the station, the marking tape is adjusted to the appropriate angle, so that the incident angle of the laser emitted by the instrument is as small as possible, and the reflection effect of the white slightly rough marking tape on the laser is the best, so that the instrument can receive high-reflection-intensity return laser, thereby obtaining accurate point cloud at a long distance.

[0032] The application realizes the three-dimensional laser scanning of the spatial form of the large-span bridge, can reduce the problems of the super-large incidence angle and the low reflection intensity caused by the pre-camber when the three-dimensional laser scanner scans in a long distance, and greatly improves the working efficiency and accuracy.

Claims

1. A folding auxiliary marking tape set for large-span bridge spatial form scanning, characterized in that, Each label tape group comprises a plurality of label tape devices of the same structure unit, each label tape device comprising a label tape (1), a first rotating connecting piece (2), a flip cover (3), a second rotating connecting piece (4) and a fixed support (5), the label tape (1) is connected with the first rotating connecting piece (2), the first rotating connecting piece (2) is fixed on the lower surface of the flip cover (3) through a first fixing bolt (10), one end of the second rotating connecting piece (4) is fixed on the side surface of the flip cover (3), and the other end is fixed on the fixed support (5), the fixed support (5) is installed on a steel plate (7), and the steel plate (7) is arranged between the main girder bottom plate of the long-span bridge and the I-steel (6) of the track girder of the maintenance vehicle; The flip cover (3) comprises a metal plate (12) and a rubber magnet (11), the metal plate (12) comprises a first metal plate and a second metal plate, the first metal plate and the second metal plate are connected through a second connecting bolt (13), the angle between the two metal plates is adjustable, the rubber magnet (11) is arranged on the upper surface of the first metal plate, and the second metal plate is vertically arranged; the rubber magnet (11) is closely attached to the bottom surface of the main girder, so that the label tape (1) is closely attached to the bottom surface of the bridge; the instrument emits laser and receives the return laser of the label tape (1), and point cloud is obtained.

2. The folded auxiliary label band set according to claim 1, wherein The label tape (1) is a white rectangular plastic plate, and the surface is frosted.

3. The folded auxiliary label band set of claim 1, wherein, The second rotating connecting piece (4) is fixed on the second metal plate, the second rotating connecting piece (4) comprises connecting plates at two ends, a first connecting plate (19) is fixed on the fixed support (5) through a third fixing bolt (20), a second connecting plate (14) is fixed on the second metal plate through a second fixing bolt (15), a connecting rod (18) and a rotating groove (16) are arranged between the two connecting plates in the axial direction, the connecting rod (18) and the rotating groove (16) are cylindrical, the rotating groove (16) is hollow, one end of the rotating groove (16) is sleeved outside the connecting rod (18), the rotating groove (16) is fixed on the connecting rod (18) through a bolt (17), and the rotating groove (16) rotates along the connecting rod (18); the other end of the rotating groove (16) is fixed on the end face of the second connecting plate (14).

4. The folded auxiliary label band set of claim 1, wherein, The first rotating connecting piece (2) is provided with two clamping grooves (8), and a first connecting bolt (9) is arranged between the two clamping grooves.

5. The folded auxiliary label band set of claim 1, wherein, The fixed support (5) comprises a vertically arranged fixed baffle (23), one end of the fixed baffle (23) is fixed with a third connecting plate (21) through a fourth fixing bolt (22), a movable baffle (24) is arranged in parallel with the fixed baffle (23), and the movable baffle (24) is fixed on the fixed baffle (23) through a limiting bolt (25).

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