CN110823183A - Bridge tower deviation measuring device based on laser technology - Google Patents

Abstract

The invention discloses a bridge tower deflection measurement device based on laser technology, comprising a laser pointer, a lifting device and a laser signal receiving platform. The gyroscope inclination sensor and the laser pointer are hinged to two telescopic rods of the electric tow rods arranged in the mutually perpendicular direction, and the fixed ends of the two electric push rods are hinged to the connecting plate, and the connecting plate is fixed on the bearing member, and the bearing member is fixed on the bridge tower. The climbing track 25 is slidably connected, the lifting device drives the bearing member to go up and down, the laser signal receiving platform is set on the bridge deck, and the laser signal receiving platform includes grid graph paper, which realizes the offset detection of the bridge tower at different heights and ensures the safety of the possible existence of the bridge tower. Hazards are eliminated.

Description

A bridge tower deflection measurement device based on laser technology

technical field

The invention belongs to the technical field of bridge engineering measurement, in particular to a bridge tower deflection measurement device based on laser technology.

Background technique

With the development of bridge engineering in China, cable-stayed bridges have become one of the main bridge types of long-span bridges in China. The offset value of the bridge tower 19 is an important deformation characteristic of the bridge structure, and the dynamic offset value of the bridge tower 19 directly or indirectly reflects the deformation performance, stability and damage of the bridge structure. According to the actual measurement results, the actual deflection curve of the bridge tower deflection value as a function of height is compared with the theoretical deflection curve, and the relevant indicators related to the deflection of the bridge tower are analyzed and evaluated. The point with abnormal deflection can be used as the next step. The focus of pylon 19 flaw detection is the scientific basis for the design and maintenance of cable-stayed bridges. At present, the commonly used measurement method is total station measurement, which uses the total station to regularly monitor the monitoring points arranged on the tower. This method is inefficient, the measurement process is cumbersome and the accuracy is low. The abnormal point of deviation at a certain position of the tower cannot be found in time for potential safety hazards.

In view of this, in order to effectively solve the problem of measuring the deflection value of the bridge tower in the load test of the cable-stayed bridge, and to improve the measurement method, a laser technology-based bridge tower deflection measuring device of the present invention is proposed.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a lift-type laser pointing instrument to measure the deviation of the bridge tower at different heights, and to use an electric push rod and a gyroscope inclination sensor to keep the laser pointing instrument in a vertical direction. Measuring device for deflection of bridge towers.

The technical solution adopted in the present invention is as follows: a bridge tower deflection measurement device based on laser technology, comprising a laser pointer 1, a fixed protection structure for the pointer, a gyroscope orientation correction device, a lifting device, and a laser signal receiving platform, so The pointing device fixing protection structure includes a suspension rod 2, a windshield 4, and a connecting plate 5. The lower end of the suspension rod 2 fixes the laser pointer 1, and the upper end of the suspension rod 2 forms a spherical rotating pair connection with the connecting plate 5. The windshield 4 It is a hollow structure, the upper end of the windshield 4 is fixed on the connecting plate 5, the windshield 4 is sleeved on the laser pointer 1, and does not contact the laser pointer 1, and the gyroscope orientation correction device includes a gyroscope inclination sensor 26, The electric push rod 14, the gyroscope inclination sensor 26 is fixed on the laser pointer 1 to measure the angle data of the laser pointer 1, the electric push rods 14 are two, and the two electric push rods 14 are perpendicular to each other Direction setting, the fixed ends of the two electric push rods 14 are hinged on the inner wall of the windshield 4, and the telescopic rod ends of the two electric push rods 14 are hinged to the suspension rod 2; the lifting device includes a wire rope 23, a bearing member 24 , a climbing rail 25, a driving device 22, the bearing member 24 is fixed to the connecting plate 5, the climbing rail 25 is fixed on the bridge tower, and is arranged in parallel with the abutment along the up-down direction, the bearing member 24 and the climbing rail 25 Sliding connection along the up and down direction, one end of the wire rope is fixed on the driving device 22, after the wire rope 23 goes up around the fixed pulley, the other end is fixed with the bearing member 24, and the fixed pulley is rotated and installed on the upper end of the bridge tower 19; the laser signal receiving platform Set on the bridge deck, the laser signal receiving platform includes a grid graph paper 16 , so that the light spot of the laser pointer 1 is projected on the grid graph paper 16 .

The laser signal receiving platform includes a tripod 20, an installation platform 8, and an offset coordinate plate. The upper end of the tripod 20 is fixed to the installation platform 8, and the upper end of the installation platform 8 is fixed to the base lower plate 12;

The offset coordinate plate includes grid coordinate paper 16, circular level bubble 15, base upper plate 11, base lower plate 12, foot screw 13, and grid coordinate paper 16 is fixed on the base upper plate 11. The leveling bubble 15 is arranged at the lower edge of the upper plate 11 of the base, and is used for leveling the upper plate 11 of the base; the foot screws 13 are set to three, which are evenly distributed along the circumferential direction of the upper plate 11 of the base, and the foot screws 13 The upper end of the base screw 13 is rotatably connected with the upper plate 11 of the base, and the lower end of the foot screw 13 is screwed with the threaded hole of the lower plate 12 of the base to realize fine adjustment and leveling of the upper plate 11 of the base.

The laser technology-based bridge tower deflection measurement device further includes a pointing device correction control system, wherein the pointing device correction control system is provided with a wireless control end and a wireless receiving end, and the wireless control end and the wireless receiving end adopt wireless communication, The wireless receiving end is used to transmit the angle data of the gyroscope inclination sensor 26 to the wireless control end, and receive the signal of the wireless control end; the wireless control end is used to receive the angle data of the gyroscope inclination sensor 26, and receive the control signal to control two electric The movement of the push rod; the gyroscope inclination sensor 26 and the two electric push rods 14 are connected to the pointing device correction control system through the line, and the pointing device correction control system and the two electric push rods 14 use the external battery installed on the windshield 4 powered by.

The driving device 22 includes a motor, a reducer, a roller, and a fixed pulley. The motor is fixed on the bridge deck, the output shaft of the motor is fixedly connected to the reducer, the output shaft of the reducer is fixed to the roller, and the roller is fixed to one end of the wire rope.

The background color of the grid graph paper 16 is white and black grids, the center of the grid graph paper 16 is the coordinate origin 17, and the graph paper 16 is marked with a scale 18 to display the position coordinates of the laser spot.

Compared with the prior art, the beneficial effects of the present invention are:

1. Through the electric lifting device, the laser pointer can measure the offset of the bridge towers of different heights, find out the sudden change of the offset of the bridge towers, and eliminate the possible safety hazards of the bridge towers;

2. Use the laser inclination sensor fixed on the laser pointer to measure the inclination of the laser pointer, and use two vertically arranged electric push rods to correct the inclination angle of the laser pointer, so as to realize the adjustment and correction of the vertical state of the laser pointer;

3. Use grid coordinate paper to measure the spot of the laser pointer to achieve accurate measurement of the deflection of the bridge tower.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

Fig. 1 is the general assembly drawing of the bridge tower deflection measuring device.

Figure 2 is a schematic diagram of the installation and connection of the laser pointer of the bridge tower deflection measurement device (without the draft shield 4).

FIG. 3 is a schematic structural diagram of a laser pointer of a bridge tower deflection measurement device.

FIG. 4 is a schematic diagram of the spherical bearing nesting of the connection structure of the bridge tower deflection measuring device.

FIG. 5 is a schematic structural diagram of a laser signal receiving platform of a bridge tower deflection measurement device.

FIG. 6 is a schematic structural diagram of the offset coordinate plate of the laser signal receiving platform of the bridge tower offset measurement device.

FIG. 7 is a detailed view of the offset coordinate plate of the laser signal receiving platform of the bridge tower offset measurement device.

FIG. 8 is a schematic structural diagram of a lifting device of a bridge tower deflection measuring device.

Fig. 9 is a schematic diagram showing the comparison between the actual deflection curve and the theoretical deflection curve of the bridge tower deflection as a function of height.

Description of reference numerals: 1. Laser pointer; 2. Suspension rod; 3. Spherical bearing; 4. Windshield; 5. Connecting plate; 6. Tripod leg; 8. Mounting platform; 9. Mounting bolt; 10. Mounting Screw hole; 11. Base upper plate; 12. Base lower plate; 13. Foot screw; 14. Electric push rod; 15. Circular level bubble; 16. Grid coordinate paper; 17. Coordinate origin; 18. Scale; 19. Bridge tower; 20. Tripod; 21. Bridge deck; 22. Driving device; 23. Steel wire rope; Actual deviation curve; 29. Deviation mutation point.

Detailed ways

In order to make the objectives, technical solutions and feasibility of the present invention more clear and detailed, the present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described below are only used to explain the present invention, but not to limit the present invention.

Referring to Figures 1 to 9, a bridge tower deflection measurement device based on laser technology includes a laser pointing device 1, a fixed protective structure for the pointing device, a gyroscope orientation correction device, a pointing device correction control system, a lifting device, and a laser signal The receiving platform, the fixed protection structure of the pointing device includes a suspension rod 2, a spherical bearing 3, a windshield 4, and a connecting plate 5, the lower end of the suspension rod 2 is fixed with the laser pointer 1, and the upper end is a spherical structure, and is nested in a fixed position. The spherical bearing 3 on the connecting plate 5 forms an active node, that is, the upper end of the suspension rod 2 forms a spherical rotating pair with the spherical bearing 3, and the spherical bearing 3 is fixed on the connecting plate 5. The windshield 4 is a hollow structure, which is windproof. The upper end of the cover 4 is fixed on the connecting plate 5 to resist the influence of wind and rain on the laser pointer 1, and the connecting plate 5 connects the upper structure of the device into a whole; the gyroscope orientation correction device includes a gyroscope inclination sensor 26. Two electric push rods 14, the gyroscope inclination sensor 26 is fixed on the laser pointer 1 to measure and output the angle data of the laser pointer 1, the two electric push rods 14 are arranged perpendicular to each other, and the two The fixed ends of the electric push rods 14 are hinged on the inner wall of the windshield 4 , and the telescopic rod ends of the two electric push rods 14 are both hinged to the suspension rod 2 . The hinge shafts at the hinge of the telescopic rod of the push rod 14 and the suspension rod 2 are arranged along the horizontal direction. The included angle between 1 and the vertical direction is corrected, so that the laser emitted by the laser pointer 1 is always kept vertically downward; the pointing device correction control system is provided with a wireless control terminal, a wireless receiving terminal, and a wireless control terminal and a wireless receiving terminal. The terminal adopts wireless communication, and the wireless receiving terminal is used to transmit the angle data of the gyroscope inclination sensor 26 to the wireless control terminal, and receive the signal of the wireless control terminal. The signal controls the movement of the two electric push rods; the gyroscope inclination sensor 26 and the two electric push rods 14 are connected to the pointing instrument correction control system through the line, and the pointing instrument correction control system and the two electric push rods are installed on the windshield 4 The lifting device includes a wire rope 23, a bearing member 24, a climbing track 25, and a driving device 22. The bearing member 24 fixes the connecting plate 5 to carry the laser pointer 1 and the gyroscope. Device, pointing device fixed protection structure, gyroscope orientation correction device, the climbing track 25 is fixed on the bridge tower, and is arranged in parallel with the bridge tower along the up and down direction, the climbing track 25 and the bridge tower 19 are synchronously offset and deformed, carrying The member 24 is slidably connected to the climbing track 25 along the up-down direction. The driving device 22 includes a motor, a reducer, a roller, and a fixed pulley. The motor is fixed on the bridge deck, and the output shaft of the motor is fixedly connected to the reducer. The shaft fixes the drum, and the drum fixes one end of the wire rope. After the wire rope goes up the fixed pulley, the other end fixes the bearing member 24. The fixed pulley is rotatably installed on the upper end of the bridge tower 19;

The laser signal receiving platform includes a tripod 20, a mounting platform 8, mounting bolts 9, and an offset coordinate plate. The tripod 20 is a leveling bracket used in the surveying and mapping project; the upper end of the tripod 20 is fixed to the mounting platform 8, and the middle of the lower plate 12 of the base. There are installation screw holes 10 penetrating up and down, and the installation bolts 9 pass through the installation screw holes 10 to fix the installation platform 8 , and the upper end of the installation platform 8 fixes the offset coordinate plate.

The offset coordinate plate includes grid coordinate paper 16, circular level bubble 15, base upper plate 11, base lower plate 12, and foot screw 13. The background color of the grid coordinate paper 16 is white and black grids. , the center of the grid coordinate paper 16 is the coordinate origin 17, and the coordinate paper 16 is marked with a scale 18 to display the position coordinates of the laser spot; the circular level bubble 15 is arranged at the lower edge of the upper plate 11 on the base , used for leveling the upper plate 11 of the base; the foot screws 13 are set to three, which are evenly distributed along the circumferential direction of the upper plate 11 of the base, and the upper end of the foot screw 13 is rotatably connected with the upper plate 11 of the base. The lower end of the foot screw 13 is screwed with the threaded hole of the lower plate 12 of the base, and the upper plate 11 of the base can be fine-tuned and leveled by rotating the foot screw 13 therein.

Before loading the cable-stayed bridge load test, the drum is driven by the rotation of the motor of the driving device 22, and the wire rope is wound, and the wire rope pulls the bearing member 24. The laser pointer 1 controls the movement of the telescopic rods of the two electric push rods, so that the laser pointer 1 is arranged in the vertical direction, and the laser is projected to a certain point on the bridge deck 21, which is used as the origin of the measurement of the offset value of the bridge tower. Move the laser signal receiving platform to make the coordinate origin 17 of the grid coordinate paper 16 coincide with the laser projection spot of the laser pointer 1, use the circular level bubble 15 to level the instrument, adjust the foot screw 13, and adjust the base plate 11 In the horizontal state, if the coordinate origin 17 does not coincide with the laser projection spot of the laser pointer 1 at this time, the grid coordinate paper 16 needs to be moved to make the coordinate origin 17 coincide with the laser projection spot of the laser pointer 1, and the grid coordinates The paper 16 is fixed on the tray 11 on the base.

When the load is loaded, the bridge tower 19 will generate the tail of the bridge tower 19 under the unbalanced load of the stay cable, which will cause the horizontal deviation in the X and Y directions on the grid coordinate paper 16. 5. Adjust to different heights in turn, and turn on the laser pointer 1 to project the laser beam. If the gyroscope inclination sensor 26 detects that the laser pointer 1 is not in the vertical state, control the telescopic rod movement of the two electric push rods 14 to make the laser The pointing device 1 is set along the vertical direction, and the laser pointing device 1 has a laser spot on the grid coordinate paper 16, and the coordinate value of the spot is read from the coordinate paper and recorded as the offset value of the bridge tower at this height, until the bridge tower is measured. Offset at the top. According to the measurement data, draw a curve diagram of the deviation value of the bridge tower 19 with height under the action of the load, and quantitatively analyze the deformation status of the bridge tower 19 according to the curve diagram of the deviation value of the bridge tower obtained by the measurement. Points and mutation points are used as the detection objects for the next step of the bridge tower 19 flaw detection.

Claims (5)

1. a bridge tower deflection measuring device based on laser technology, is characterized in that: comprise laser pointing device (1), pointing device fixed protection structure, gyroscope orientation correction device, lifting device, laser signal receiving platform, described The pointing device fixing protection structure includes a suspension rod (2), a windshield (4), and a connecting plate (5). 5) Forming a spherical rotating pair connection, the windshield (4) is a hollow structure, the upper end of the windshield (4) is fixed on the connecting plate (5), the windshield (4) is sleeved on the laser pointer (1), and Not in contact with the laser pointer (1), the gyroscope orientation correction device includes a gyroscope inclination sensor (26) and an electric push rod (14), and the gyroscope inclination sensor (26) is fixed on the laser pointer (1). ), in order to measure the angle data of the laser pointer (1), the electric push rods (14) are two, the two electric push rods (14) are arranged in a mutually perpendicular direction, and the two electric push rods (14) The fixed ends of the two electric push rods (14) are hinged on the inner wall of the windshield (4), and the telescopic rod ends of the two electric push rods (14) are hinged to the suspension rods (2); the lifting device includes a wire rope (23), a bearing member (24) ), a climbing rail (25), a driving device (22), the bearing member (24) is fixed to the connecting plate (5), the climbing rail (25) is fixed on the bridge tower, and is parallel to the bridge tower along the up-down direction The bearing member (24) is slidably connected to the climbing track (25) along the up-down direction, one end of the wire rope is fixed on the driving device (22), and after the wire rope (23) goes up around the fixed pulley, the other end is fixed on the bearing member ( 24), the fixed pulley is rotatably installed on the upper end of the bridge tower (19); the laser signal receiving platform is arranged on the bridge deck, and the laser signal receiving platform includes a grid coordinate paper (16), in order to make the laser pointer (1); ) is projected on the grid graph paper (16). 2. The bridge tower deflection measuring device based on laser technology according to claim 1, characterized in that: the laser signal receiving platform comprises a tripod (20), an installation platform (8), and a deflection coordinate plate, and the The upper end of the tripod (20) fixes the installation platform (8), and the upper end of the installation platform (8) fixes the base lower plate (12); The offset coordinate plate comprises grid coordinate paper (16), a circular level bubble (15), an upper plate of the base (11), a lower plate of the base (12), a foot screw (13), and an upper plate of the base (11). ) on the fixed grid coordinate paper (16), the circular leveling bubble (15) is arranged at the lower edge of the upper plate (11) on the base for leveling the upper plate (11) on the base; the foot screw (15) 13) Set as three, evenly distributed along the circumferential direction of the upper plate (11) of the base, the upper end of the foot screw (13) is rotatably connected with the upper plate (11) of the base, and the lower end of the foot screw (13) is connected to the base plate (11). The threaded holes of the lower plate (12) of the seat are screwed together to realize fine adjustment and leveling of the upper plate (11) of the base. 3. The bridge tower deflection measurement device based on laser technology according to claim 1, characterized in that: further comprising a pointing device correction control system, the pointing device correction control system is provided with a wireless control terminal, a wireless receiving terminal, a wireless The control end and the wireless receiving end adopt wireless communication, and the wireless receiving end is used for transmitting the angle data of the gyroscope inclination sensor (26) to the wireless control end, and receiving the signal of the wireless control end; the wireless control end is used for receiving the gyroscope inclination sensor (26). 26), and receive control signals to control the movement of the two electric push rods; the gyroscope inclination sensor (26) and the two electric push rods (14) are connected with the pointing device correction control system through the line, and the pointing device correction control system The system and the two electric push rods (14) are powered by an external battery mounted on the windshield (4). 4. The bridge tower deflection measuring device based on laser technology according to any one of claims 1-3, wherein the drive device (22) comprises a motor, a reducer, a roller, and a fixed pulley, and the motor is fixed on the On the bridge deck, the output shaft of the motor is fixedly connected to the reducer, the output shaft of the reducer is fixed to the drum, and the drum is fixed to one end of the wire rope. 5. The laser technology-based bridge tower deflection measurement device according to claim 2 or 3, wherein the background color of the grid coordinate paper (16) is white and black grids, and the grid coordinates The center of the paper (16) is the coordinate origin (17), and a scale (18) is marked on the coordinate paper (16) for displaying the position coordinates of the laser spot.

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