Spraying device and construction method for bridge arch rib

Abstract

The present invention relates to the technical field of bridge construction, and in particular to a spraying device and a construction method for bridge arch ribs, comprising a frame, a boss being provided on the lower side of the frame, a first walking wheel and a motor being provided on the boss; a first hydraulic push rod being further provided, a first rotating motor being installed at the output end of the first hydraulic push rod, the first rotating motor being connected to a connecting rod with an L-shaped structure, and a second walking wheel being provided at the horizontal end of the connecting rod; an arch top spraying mechanism being provided at the lower side of the frame; two second hydraulic push rods and two tooth plate telescopic mechanisms being symmetrically provided on both sides of the frame, the output ends of the two second hydraulic push rods being connected to the second rotating motor, and the output ends of the second rotating motor being connected to the arch bottom spraying mechanism; the two tooth plate telescopic mechanisms being connected to the arch side spraying mechanisms; through the spraying device, automated painting and spraying operations on the surfaces of arch feet and bridge arch ribs are realized, with high speed and high degree of mechanization, reducing pollution of finished products and waste of raw materials, and greatly improving the safety of spraying operations.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, in particular to a spraying device for bridge arch ribs and a construction method. Background Art

[0002] The arch rib is the skeleton of the main arch ring of the arch bridge. The arch rib cannot be sprayed with anti-rust paint before installation, otherwise the painted surface will be burned after welding and will not play a rust-proof role. Therefore, the arch rib needs to be sprayed after installation. When spraying the existing arch ribs, workers often use a manual safety belt method to go up the arch to work. Workers need to step on the arch rib and spray the side of the arch rib. This is not only extremely dangerous, but also causes contamination of the finished product and wastes raw materials. At the same time, the manual safety belt method cannot spray the top and bottom surfaces of the arch rib. The top, side and bottom surfaces of the arch rib need to be sprayed three times, which is very time-consuming, has low construction efficiency and a long construction period. Summary of the Invention

[0003] The present invention aims to solve the above problems, thereby providing a bridge arch rib spraying device and construction method that are convenient for improving construction efficiency and reducing the danger of arch rib spraying operations.

[0004] The present invention solves the above problems by adopting the following technical solutions:

[0005] A spraying device for bridge arch ribs comprises a frame, a paint supply box is provided on the frame, a feeding port is provided on the paint supply box, an openable cover is provided on the upper part of the feeding port, a boss is provided on the lower side of the frame, a first travel wheel is provided on the boss, a motor for controlling the travel of the first travel wheel is provided in the boss; a first hydraulic push rod is also provided on the frame, a first rotating motor is installed at the output end of the first hydraulic push rod, an L-shaped connecting rod is connected to the output end of the first rotating motor, a second travel wheel is provided at the horizontal end of the connecting rod, and the second travel wheel is located on both sides of the first travel wheel; an arch spraying mechanism is provided on the lower side of the frame; symmetrically arranged Two second hydraulic push rods and two toothed plate telescopic mechanisms are provided, the output ends of the two second hydraulic push rods are connected to the second rotating motor, and the output end of the second rotating motor is connected to the arch bottom spraying mechanism; the two toothed plate telescopic mechanisms are connected to the arch side spraying mechanism; the arch side spraying mechanism, the arch top spraying mechanism and the arch bottom spraying mechanism are connected to the paint supply box and are located on the rear side of the first walking wheel and the second walking wheel; and also includes a main controller, which is electrically connected to the motor, the first hydraulic push rod, the first rotating motor, the second hydraulic push rod, the second rotating motor, the toothed plate telescopic mechanism, the arch side spraying mechanism, the arch top spraying mechanism and the arch bottom spraying mechanism respectively.

[0006] Preferably, a further technical solution of the present invention is:

[0007] The arch side spraying mechanism includes a side spraying plate, and the tooth plate telescopic mechanism includes two oppositely arranged vertical tooth plates. The side spraying plate is arranged between the two vertical tooth plates. The two sides of the side spraying plate are rotatably connected with adjusting gears through a rotating shaft, and the adjusting gears are engaged with the two vertical tooth plates; a third rotating motor is also provided on the side spraying plate, and the output end of the third rotating motor is transmission-connected to the rotating shaft; a plurality of first nozzles are arranged on the side spraying plate, and the feed end of the first nozzle is connected to the paint supply box through a first material guide pipe, and a first control valve is provided on the first material guide pipe; the main controller is electrically connected to the first control valve and the third rotating motor.

[0008] The dome spraying mechanism includes a dome spraying plate, on which a plurality of second nozzles are arranged. The feed ends of the second nozzles are connected to the paint supply box through a second material guide pipe, on which a second control valve is provided. The main controller is electrically connected to the second control valve.

[0009] The arch bottom spraying mechanism includes a first vertical rod, the upper end of the first vertical rod is connected to the output end of the second rotating motor, and the lower end is connected to the arch bottom spraying plate, which is arranged perpendicular to the first vertical rod; a plurality of third nozzles are arranged on the arch bottom spraying plate, and the feed end of the third nozzle is connected to the paint supply box through a third material guide pipe, and a third control valve is provided on the third material guide pipe; the main controller is electrically connected to the third control valve.

[0010] The width of the frame is greater than the width of the arch rib, and the width of the boss is less than the width of the arch rib.

[0011] The present invention also provides a bridge arch rib spraying construction method, which is carried out using a bridge arch rib spraying device, and the steps include:

[0012] S1, arch foot spraying: Place the first running wheel of the spraying device on the arch foot, adjust the first hydraulic push rod and the first rotary motor so that the second running wheel is placed on the bridge deck outside the arch foot; adjust the second hydraulic push rod and the second rotary motor so that the arch bottom spraying device is located on the upper side of the bridge deck; adjust the tooth plate telescopic mechanism so that the arch side spraying mechanism is located on both sides of the arch foot; the main controller controls the motor to move the first running wheel along the arch foot, and at the same time, the main controller controls the arch top spraying mechanism to spray the top surface of the arch foot and the arch side spraying mechanism to spray the two side surfaces of the arch foot;

[0013] S2, arch rib spraying: After the spraying device moves to the arch rib, the main controller controls the first hydraulic push rod and the first rotary motor to rotate the second travel wheel inward, and the first travel wheel and the second travel wheel clamp the arch rib; the second hydraulic push rod and the second rotary motor are adjusted to rotate the arch bottom spraying device inward, parallel to the bottom surface of the arch rib; the main controller controls the motor to move the first travel wheel along the arch rib. At the same time, the main controller controls the arch top spraying mechanism to spray the top surface of the arch rib, the arch side spraying mechanism to spray the two side surfaces of the arch rib, and the arch bottom spraying mechanism to spray the bottom surface of the arch rib;

[0014] S3, spraying of the opposite arch foot: after completing the arch rib spraying, the device reaches the opposite arch foot, the arch bottom spraying mechanism stops spraying, and the first hydraulic push rod and the first rotary motor are adjusted to place the second running wheel on the bridge deck outside the arch foot again; the main controller controls the motor to make the first running wheel arch down along the opposite arch foot, and at the same time, the main controller controls the arch top spraying mechanism to spray the top surface of the opposite arch foot and the arch side spraying mechanism to spray the two side surfaces of the opposite arch foot.

[0015] Furthermore, in step S2, when the arch rib is sprayed, a hanger is connected between the arch rib and the bridge deck, and when the first running wheel and the second running wheel clamp the arch rib, the two second running wheels are located on both sides of the hanger.

[0016] Furthermore, in step S1, the moving direction of the second walking wheel is set parallel to the arch rib; in step S2, the main controller first controls the first hydraulic push rod to lower the second walking wheel, and then the first rotary motor controls the second walking wheel to rotate 180°, and then the first hydraulic push rod pulls up the second walking wheel until the second walking wheel is in contact with the bottom surface of the arch rib; in step S3, the main controller first controls the first hydraulic push rod to lower the second walking wheel, so that the second walking wheel is separated from the bottom surface of the arch rib, and then the first rotary motor controls the second walking wheel to rotate 180°, and then adjusts the first hydraulic push rod to make the second walking wheel in contact with the bridge deck.

[0017] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features:

[0018] Through the spraying device, the automatic painting and spraying operation of the arch foot and bridge arch rib surface is realized, which is fast and highly mechanized, reduces the pollution of finished products and the waste of raw materials, and greatly improves the safety of the spraying operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a spraying device for bridge arch ribs in an embodiment of the present invention;

[0020] Figure 2 This is a schematic structural diagram of the other side of the spraying device for bridge arch ribs in an embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the structure of the tooth plate telescopic mechanism in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the structure of the arch bottom spraying mechanism in an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the connection structure of the second traveling wheel in an embodiment of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the arch foot during spraying in an embodiment of the present invention;

[0025] Figure 7 This is a schematic structural diagram of the arch rib spraying in an embodiment of the present invention;

[0026] Figure 8 This is a schematic structural diagram of the other side of the arch foot during spraying in an embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure on the other side of the arch rib during spraying in an embodiment of the present invention.

[0028] In the figure: 1. frame; 2. boss; 3. first travel wheel; 4. first hydraulic push rod; 5. first rotary motor; 6. connecting rod; 7. second travel wheel; 8. second hydraulic push rod; 9. second rotary motor; 10. arch bottom spraying mechanism; 1001. arch bottom spraying plate; 1002. third nozzle; 11. vertical gear plate; 12. arch side spraying mechanism; 1201. side spraying plate; 1202. first nozzle; 13. arch top spraying mechanism; 14. adjusting gear; 15. arch foot; 16. arch rib; 17. boom. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0030] like Figures 1 to 5As shown, this embodiment provides a spraying device for bridge arch ribs, including a frame 1, a paint supply box is provided on the frame 1, a feeding port is provided on the paint supply box, and an openable cover is provided on the upper part of the feeding port; two bosses 2 are provided on the lower side of the frame 1, and each boss 2 is rotatably connected to a first walking wheel 3 on both sides, and a motor for controlling the movement of the first walking wheel 3 is provided in the boss 2; two groups of first hydraulic push rods 4 are also provided on the frame 1, two in each group, and the output end of the first hydraulic push rod 4 is installed with a first rotating motor 5, and the output end of the first rotating motor 5 is connected to an L-shaped connecting rod 6, and the horizontal end of the connecting rod 6 is provided with a second walking wheel 7, and the second walking wheel 7 is located on the outside of the first walking wheel 3; an arch spraying mechanism 13 is provided on the lower side of the frame 1; two second hydraulic push rods 8 and two tooth plates are symmetrically provided on both sides of the frame 1 Telescopic mechanism, the output ends of the two second hydraulic push rods 8 are connected to the second rotating motor 9, and the output end of the second rotating motor 9 is connected to the arch bottom spraying mechanism 10; the two tooth plate telescopic mechanisms are meshed and connected with the arch side spraying mechanism 12; the arch side spraying mechanism, the arch top spraying mechanism and the arch bottom spraying mechanism are connected to the paint supply box, and are located on the rear side of the first walking wheel 3 and the second walking wheel 7; it also includes a main controller, which is electrically connected to the motor, the first hydraulic push rod 4, the first rotating motor 5, the second hydraulic push rod 8, the second rotating motor 9, the tooth plate telescopic mechanism, the arch side spraying mechanism, the arch top spraying mechanism and the arch bottom spraying mechanism respectively; wherein, the width of the frame 1 is greater than the width of the arch rib 16, and the width of the boss 2 is less than the width of the arch rib 16, so that the first walking wheel 3 is located on the arch rib 16, and the arch side spraying mechanism 12 is located on both sides of the arch rib 16.

[0031] like Figure 3 The arch side spraying mechanism 12 includes a side spraying plate 1201, on which a plurality of first nozzles 1202 are arranged. The feed end of the first nozzle 1202 is connected to the paint supply box through a first guide pipe, and a first control valve is provided on the first guide pipe; the first control valve is electrically connected to the main controller to control the first nozzle 1202 to spray paint outward, and the spraying direction is at an angle of 30°-60° with the side of the arch foot 15 or the arch rib 16; the tooth plate telescopic mechanism includes two relatively arranged vertical The tooth plate 11 and the lateral spraying plate 1201 are arranged between the two vertical tooth plates 11. The two sides of the lateral spraying plate 1201 are connected with adjusting gears 14 through rotating shafts, and the adjusting gears 14 are engaged with the two vertical tooth plates 11. A third rotating motor is also provided on the lateral spraying plate 1201. The output end of the third rotating motor is connected to the rotating shaft transmission. The main controller is electrically connected to the third rotating motor for driving the adjusting gear 14 to rotate, thereby making the lateral spraying plate 1201 reciprocate along the vertical tooth plate 11.

[0032] The arch spraying mechanism 13 includes an arch spraying plate, which is arranged perpendicular to the long direction of the arch rib 16 and parallel to the top surface of the arch rib 16; a plurality of second nozzles are arranged on the arch spraying plate, and the feed end of the second nozzle is connected to the paint supply box through a second material guide pipe. A second control valve is provided on the second material guide pipe, and the main controller is electrically connected to the second control valve for controlling the second nozzle to spray paint outward, and the spraying direction is at an angle of 30°-60° with the arch foot 15 or the top surface of the arch rib 16.

[0033] like Figure 4 The arch bottom spraying mechanism 10 includes a first vertical rod, the upper end of the first vertical rod is connected to the output end of the second rotating motor 9, and the lower end is connected to the arch bottom spraying plate 1001, which is arranged perpendicular to the first vertical rod; a plurality of third nozzles 1002 are arranged on the arch bottom spraying plate 1001, and the feed end of the third nozzle 1002 is connected to the paint supply box through a third material guide pipe. A third control valve is provided on the third material guide pipe, and the main controller is electrically connected to the third control valve for controlling the third nozzle 1002 to spray paint outward, and the spraying direction is at an angle of 30°-60° to the bottom surface of the arch foot 15 or the arch rib 16 to avoid paint splashing back to the nozzle, clogging the nozzle or affecting the spraying quality.

[0034] The present invention also provides a method for spraying the bridge arch rib 16, which is carried out using a spraying device for the bridge arch rib 16, and the steps include:

[0035] S1, Arch foot 15 spraying: Figure 6 As shown, the first running wheel 3 of the spraying device is placed on the arch foot 15, and the first hydraulic push rod 4 and the first rotating motor 5 are adjusted so that the second running wheel 7 is placed on the bridge deck outside the arch foot 15 to enhance the stability of the device when walking; the second hydraulic push rod 8 and the second rotating motor 9 are adjusted so that the arch bottom spraying device is located on the upper side of the bridge deck, and the arch bottom spraying device does not perform spraying operations; the toothed plate telescopic mechanism is adjusted so that the arch side spraying mechanism 12 is located on both sides of the arch foot 15; the main controller controls the motor to move the first running wheel 3 along the arch foot 15, and the traveling direction of the second running wheel 7 is parallel to the arch rib 16; at the same time, the main controller controls the second control valve of the arch top spraying mechanism 13 to open, and the second nozzle sprays the top surface of the arch foot 15, and the first control valve of the arch side spraying mechanism 12 is opened, and the first nozzle 1202 sprays the two side surfaces of the arch foot 15;

[0036] S2, arch rib 16 spraying: Figure 7As shown, after the spraying device moves to the arch rib 16; the main controller first controls the first hydraulic push rod 4 to lower the second walking wheel 7, and then the first rotating motor 5 controls the second walking wheel 7 to rotate 180°, and then the first hydraulic push rod 4 pulls the second walking wheel 7 up, pulls it until the second walking wheel 7 is in contact with the bottom surface of the arch rib 16, so that the first walking wheel 3 and the second walking wheel 7 clamp the arch rib 16; at the same time, the main controller adjusts the second hydraulic push rod 8 and the second rotating motor 9 to make the arch bottom spraying device rotate inward, located at the lower side of the bottom surface of the arch rib 16 and parallel to the bottom surface of the arch rib 16, and the spraying direction of the arch bottom spraying device is tilted upward; the main controller controls the motor to make the first walking wheel 3 move along the arch rib 16, and at the same time, drives the second walking wheel 7 to move along the bottom surface of the arch rib 16; the main controller controls the arch top spraying mechanism 13 to spray the top surface of the arch rib 16, the arch side spraying mechanism 12 to spray the two side surfaces of the arch rib 16, and the arch bottom spraying mechanism 10 to spray the bottom surface of the arch rib 16.

[0037] Among them, the arch top spraying mechanism 13 has a spraying direction that is at an angle of 30°-60° to the top surface of the arch rib 16, the arch side spraying mechanism 12 has a spraying direction that is at an angle of 30°-60° to the side surface of the arch rib 16, and the arch bottom spraying mechanism 10 has a spraying direction that is at an angle of 30°-60° to the bottom surface of the arch rib 16. The spraying direction is opposite to the traveling direction of the first walking wheel 3.

[0038] Further, such as Figure 9 As shown, when the arch rib 16 is sprayed, a hanger 17 is connected between the arch rib 16 and the bridge deck. When the first running wheel 3 and the second running wheel 7 clamp the arch rib 16, the two second running wheels 7 are located on both sides of the hanger 17; the two arch bottom spraying plates 1001 are located on both sides of the hanger 17, and the spraying area of ​​the third nozzle 1002 can cover the gap between the two arch bottom spraying plates 1001.

[0039] S3, spray the arch foot 15 on the opposite side: Figure 9 As shown, after the spraying of the arch rib 16 is completed, the device reaches the opposite arch foot 15, and the arch bottom spraying mechanism 10 stops spraying. The main controller first controls the first hydraulic push rod 4 to lower the second running wheel 7 to separate the second running wheel 7 from the bottom surface of the arch rib 16, and then the first rotary motor 5 controls the second running wheel 7 to rotate 180°, and then adjusts the first hydraulic push rod 4 to make the second running wheel 7 fit against the bridge deck; the main controller controls the motor to make the first running wheel 3 arch down along the opposite arch foot 15, and at the same time, the main controller controls the arch top spraying mechanism 13 to spray the top surface of the opposite arch foot 15, and the arch side spraying mechanism 12 to spray the two side surfaces of the opposite arch foot 15.

[0040] S4: After the sprayed anti-rust paint has dried, check the quality of the paint and manually touch up the unsprayed areas.

[0041] Through the spraying device, the automatic painting and spraying operation on the surface of the arch foot 15 and the bridge arch rib 16 is realized, which is fast and highly mechanized, reduces the pollution of finished products and the waste of raw materials, and greatly improves the safety of the spraying operation.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of the present invention.

Claims

1. A spraying device for a bridge arch rib, comprising a frame, a paint supply box provided on the frame, a feeding port provided on the paint supply box, and an openable cover provided on the feeding port, characterized in that: A boss is provided on the lower side of the frame, a first travel wheel is provided on the boss, and a motor for controlling the travel of the first travel wheel is provided in the boss; The frame is also provided with a first hydraulic push rod, the output end of the first hydraulic push rod is installed with a first rotary motor, the output end of the first rotary motor is connected to an L-shaped connecting rod, the horizontal end of the connecting rod is provided with a second travel wheel, and the second travel wheel is located on both sides of the first travel wheel; A dome spraying mechanism is provided on the lower side of the frame; two second hydraulic push rods and two toothed plate telescopic mechanisms are symmetrically provided on both sides of the frame; the output ends of the two second hydraulic push rods are connected to a second rotating motor, and the output end of the second rotating motor is connected to the dome spraying mechanism; the two toothed plate telescopic mechanisms are both connected to an dome side spraying mechanism; the dome side spraying mechanism, the dome top spraying mechanism, and the dome bottom spraying mechanism are connected to a paint supply box and are located behind the first and second travel wheels; The main controller is electrically connected to the motor, the first hydraulic push rod, the first rotary motor, the second hydraulic push rod, the second rotary motor, the tooth plate telescopic mechanism, the arch side spraying mechanism, the arch top spraying mechanism and the arch bottom spraying mechanism respectively; The arch side spraying mechanism includes a side spraying plate, and the tooth plate telescopic mechanism includes two oppositely arranged vertical tooth plates. The side spraying plate is arranged between the two vertical tooth plates. Adjustment gears are rotatably connected to the two sides of the side spraying plate through a rotating shaft, and the adjustment gears are engaged with the two vertical tooth plates. A third rotating motor is also provided on the side spraying plate, and the output end of the third rotating motor is transmission-connected to the rotating shaft. A plurality of first nozzles are arranged on the side spraying plate, and the feed end of the first nozzle is connected to the paint supply box through a first guide pipe, and a first control valve is provided on the first guide pipe; the main controller is electrically connected to the first control valve and the third rotating motor; The dome spraying mechanism includes a dome spraying plate, on which a plurality of second nozzles are arranged. The feed ends of the second nozzles are connected to the paint supply box through a second material guide pipe, and a second control valve is provided on the second material guide pipe; the main controller is electrically connected to the second control valve; The arch bottom spraying mechanism includes a first vertical rod, the upper end of the first vertical rod is connected to the output end of the second rotating motor, and the lower end is connected to the arch bottom spraying plate, which is arranged perpendicular to the first vertical rod; a plurality of third nozzles are arranged on the arch bottom spraying plate, and the feed end of the third nozzle is connected to the paint supply box through a third material guide pipe, and a third control valve is provided on the third material guide pipe; the main controller is electrically connected to the third control valve.

2. The bridge arch rib spraying device according to claim 1, characterized in that: The width of the frame is greater than the width of the arch rib, and the width of the boss is less than the width of the arch rib.

3. A bridge arch rib spraying construction method, characterized by: The bridge arch rib spraying device according to any one of claims 1 to 2 is used, and the steps include: S1, arch foot spraying: Place the first running wheel of the spraying device on the arch foot, adjust the first hydraulic push rod and the first rotary motor so that the second running wheel is placed on the bridge deck outside the arch foot; adjust the second hydraulic push rod and the second rotary motor so that the arch bottom spraying device is located on the upper side of the bridge deck; adjust the tooth plate telescopic mechanism so that the arch side spraying mechanism is located on both sides of the arch foot; the main controller controls the motor to move the first running wheel along the arch foot, and at the same time, the main controller controls the arch top spraying mechanism to spray the top surface of the arch foot and the arch side spraying mechanism to spray the two side surfaces of the arch foot; S2, arch rib spraying: After the spraying device moves to the arch rib, the main controller controls the first hydraulic push rod and the first rotary motor to rotate the second travel wheel inward, and the first travel wheel and the second travel wheel clamp the arch rib; the second hydraulic push rod and the second rotary motor are adjusted to rotate the arch bottom spraying device inward, parallel to the bottom surface of the arch rib; the main controller controls the motor to move the first travel wheel along the arch rib. At the same time, the main controller controls the arch top spraying mechanism to spray the top surface of the arch rib, the arch side spraying mechanism to spray the two side surfaces of the arch rib, and the arch bottom spraying mechanism to spray the bottom surface of the arch rib; S3, spraying of the opposite arch foot: after completing the arch rib spraying, the device reaches the opposite arch foot, the arch bottom spraying mechanism stops spraying, and the first hydraulic push rod and the first rotary motor are adjusted to place the second running wheel on the bridge deck outside the arch foot again; the main controller controls the motor to make the first running wheel arch down along the opposite arch foot, and at the same time, the main controller controls the arch top spraying mechanism to spray the top surface of the opposite arch foot and the arch side spraying mechanism to spray the two side surfaces of the opposite arch foot.

4. The bridge arch rib spraying construction method according to claim 3, characterized in that: In step S2, when the arch rib is sprayed, a hanger is connected between the arch rib and the bridge deck. When the first running wheel and the second running wheel clamp the arch rib, the two second running wheels are located on both sides of the hanger.

5. The bridge arch rib spraying construction method according to claim 3, characterized in that: In step S1, the moving direction of the second traveling wheel is set parallel to the arch rib; in step S2, the main controller first controls the first hydraulic push rod to lower the second traveling wheel, and then the first rotary motor controls the second traveling wheel to rotate 180°, and then the first hydraulic push rod pulls up the second traveling wheel until the second traveling wheel is in contact with the bottom surface of the arch rib; in step S3, the main controller first controls the first hydraulic push rod to lower the second traveling wheel, so that the second traveling wheel is separated from the bottom surface of the arch rib, and then the first rotary motor controls the second traveling wheel to rotate 180°, and then adjusts the first hydraulic push rod to make the second traveling wheel in contact with the bridge deck.

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