Splicing and closure coordination operation method for last segment of arch bridge

Abstract

The invention belongs to the technical field of arch bridge construction, and particularly relates to an arch bridge last section splicing and closure coordination operation method which comprises the following steps: step 1, early-stage preparation: accurately measuring an arch bridge last section, and determining a splicing position and a closure point; a high-precision measuring instrument is used, a laser range finder and a total station are adopted, and materials and tools needed by splicing are prepared. According to the last arch bridge section splicing and closure coordination operation method, the splicing and closure precision is improved, and the structural safety is ensured. The construction process is good in coordination, the arch bridge sections are allowed to be finely adjusted in a three-dimensional space, the splicing precision is ensured, and through accurate adjustment and positioning, structural deviation and accident risks possibly occurring in the construction process are reduced, and the construction difficulty and risks are reduced. And the accurate butt joint operation is favorable for improving the overall structural quality and prolonging the service life of the arch bridge, and the construction period is shortened. The welding quality is ensured, and the construction quality is guaranteed through nondestructive testing.

Description

Technical Field

[0001] The invention relates to the technical field of arch bridge construction, and in particular to a coordinated operation method for splicing and connecting the last segments of an arch bridge. Background Art

[0002] In the construction of arch bridges, the splicing and closure of the last segment of the arch bridge is a key step, which is related to the stability and safety of the entire bridge structure. However, the existing splicing and closure methods usually have problems such as high coordination difficulty, low construction accuracy, and high construction risk. These problems seriously affect the construction efficiency and quality of the arch bridge, and may even cause structural safety hazards. Therefore, there is an urgent need for a new method to improve the efficiency and accuracy of the splicing and closure of the last segment of the arch bridge to ensure the safety and quality of the construction process. Summary of the invention

[0003] Based on the existing technical problems, the present invention proposes a method for coordinating the splicing and connection of the last segments of an arch bridge.

[0004] The present invention proposes a method for coordinating the splicing and merging of the last segment of an arch bridge, which comprises the following steps: step one, preliminary preparation, accurately measuring the last segment of the arch bridge to determine the splicing position and merging point; using high-precision measuring instruments, such as a laser rangefinder and a total station, preparing materials and tools required for splicing, and checking the status of mechanical equipment.

[0005] Step 2: Bracket setting and docking operations: Adjustment brackets are set at both ends of the last segment of the arch bridge; the bearing capacity of the adjustment bracket is calculated using the following formula:

[0006] where F s is the bearing capacity of a single support, W t is the total weight of the segment, and n is the number of brackets. The last segment is adjusted by using a laser rangefinder, a total station, and the adjustment bracket to achieve precise docking of the segments at both ends. The adjustment amount is determined by calculating the errors of the segments at both ends. The calculation formula is:

[0007] Δx=x2-x1, Δy=y2-y1, Δz=z2-z1, where x1, y1, z1 and x2, y2, z2

[0008] are the coordinates of the two end segments respectively.

[0009] Step 3: synchronous lifting and positioning. Use a multi-point synchronous lifting system to lift the last segment to the designed height, and position and fix it by adjusting the bracket. The control of the synchronous lifting system requires accurate calculation of the lifting speed and displacement, using the following formula: where v i is the speed of the i-th lifting point, Δh iis the lifting height, and t is the lifting time.

[0010] Step 4: Welding and fixing; After precise docking and positioning, the segment welding operation is carried out; After welding is completed, high-strength bolts are used for further fixing; The welding quality is verified by non-destructive testing; Ultrasonic testing and X-ray testing are used to perform non-destructive testing on the splicing and closure parts, and the qualified rate of the test results is calculated using the following formula: The quality inspection formula is: Among them, Q is the qualified rate, N pass is the number of qualified tests, N total is the total number of detections.

[0011] Preferably, the adjustment bracket comprises a bracket bottom plate, a movable adjustment mechanism is arranged on the top of the bracket bottom plate, a splicing adjustment mechanism is arranged on the top of the movable adjustment mechanism, and clamping positioning mechanisms are arranged at both ends of the bracket bottom plate.

[0012] The movement and adjustment mechanism realizes the movement and adjustment of the last segment in the transverse direction and the longitudinal direction.

[0013] The splicing adjustment mechanism realizes the action of adjusting the splicing of the last segment in the vertical direction.

[0014] The clamping and positioning mechanism realizes the action of quickly installing and disassembling the two ends of the adjustment bracket and the spliced ​​segments.

[0015] Preferably, the clamping and positioning mechanism includes a lower clamping base installed on the top of both ends of the bracket base plate, and the four lower clamping bases are distributed in a rectangular array. The top groove of the lower clamping base is in contact with the bottom of the segment to be spliced, and a vertical guide rail is also fixedly installed on one side of the lower clamping base, and a top plate is fixedly installed on the top of the vertical guide rail. A telescopic cylinder is installed at the top height of the top plate, and the telescopic bottom end of the telescopic cylinder penetrates and extends to the bottom of the top plate.

[0016] Preferably, an upper clamping base is fixedly installed on the telescopic bottom end of the telescopic cylinder, and the bottom groove of the upper clamping base contacts the top of the segment to be spliced. A slider is also fixedly installed on one side of the upper clamping base, and the surface of the slider is slidably plugged into the surface of the vertical guide rail.

[0017] Preferably, the movable adjustment mechanism includes a bearing seat installed on the top of the base plate of the bracket, and the four bearing seats are distributed in a rectangular array. The relative surfaces of every two bearing seats are rotatably connected to a rotating shaft through a bearing, and the arc surface of the rotating shaft is threadedly connected to a connecting cross plate.

[0018] Preferably, a first drive motor is fixedly mounted on one side of one of the bearing seats, an output end of the first drive motor is fixedly mounted to one end relative to the rotating shaft via a coupling, a first pulley is fixedly mounted on the other end of the two rotating shafts, and the inner walls of the grooves of the two first pulleys are transmission-connected to a first conveyor belt.

[0019] Preferably, bearing seats 2 are fixedly installed on the top of the left end and the top of the right end of the connecting horizontal plate, and the four bearing seats 2 are distributed in a rectangular array. Every two surfaces relative to the bearing seats 2 are rotatably connected with an adjusting shaft through a bearing, and the arc surface of the adjusting shaft is threadedly connected with a connecting longitudinal plate.

[0020] Preferably, a second drive motor is fixedly installed on one side of one of the bearing seats, and the output end of the second drive motor is fixedly installed on one end relative to the adjusting shaft through a coupling, and a second pulley is fixedly installed on the other end of the two adjusting shafts, and the inner walls of the grooves of the two second pulleys are transmission-connected with a second conveyor belt.

[0021] Preferably, the splicing adjustment mechanism includes an arc-shaped support plate, and inclined side plates are fixedly installed at both front and rear ends of the connecting longitudinal plate. A driving groove is provided on the top inclined surface of the inclined side plate, and an adjusting cylinder is fixedly installed on the inner wall of the driving groove. The telescopic top end of the adjusting cylinder is fixedly installed on the bottom of the arc-shaped support plate.

[0022] Preferably, the size of the top grooves of the plurality of arc-shaped support plates is adapted to the arc-shaped surface of the last segment, and the four arc-shaped support plates are distributed at the four corners of the last segment.

[0023] The beneficial effects of the present invention are:

[0024] The invention improves the accuracy of splicing and closure, ensuring structural safety. The construction process is well coordinated, allowing fine-tuning of arch bridge segments in three-dimensional space to ensure splicing accuracy. Through precise adjustment and positioning, it reduces possible structural deviations and accident risks during construction, and reduces construction difficulty and risk. It improves construction efficiency, and precise docking operations help improve the overall structural quality and service life of the arch bridge and shorten construction period. Ensure welding quality and ensure construction quality through non-destructive testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a coordinated operation method for splicing and connecting the last segments of an arch bridge;

[0026] Figure 2 A three-dimensional diagram of the structure of the last segment of an arch bridge in which a method for coordinating the splicing and connection of the last segment is provided;

[0027] Figure 3A three-dimensional diagram of a splicing adjustment mechanism for a method of coordinating the splicing and joining of the last segments of an arch bridge;

[0028] Figure 4 A three-dimensional diagram of a clamping and positioning mechanism for a coordinated operation method for splicing and connecting the last segments of an arch bridge;

[0029] Figure 5 The present invention is a three-dimensional diagram of a movable adjustment mechanism for a coordinated operation method of splicing and connecting the last segments of an arch bridge.

[0030] In the figure: 1. the last segment; 2. the adjusting bracket; 3. the bracket bottom plate; 4. the moving adjusting mechanism; 41. the bearing seat one; 42. the rotating shaft; 43. the connecting horizontal plate; 44. the first driving motor; 45. the first pulley; 46. the first conveyor belt; 47. the bearing seat two; 48. the adjusting rotating shaft; 49. the connecting longitudinal plate; 410. the second driving motor; 411. the second pulley; 412. the second conveyor belt; 5. the splicing adjusting mechanism; 51. the arc-shaped support plate; 52. the inclined side plate; 53. the driving groove; 54. the adjusting cylinder; 6. the clamping and positioning mechanism; 61. the lower clamping base; 62. the vertical guide rail; 63. the top plate; 64. the telescopic cylinder; 65. the upper clamping base; 66. the slider. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figure 1-Figure 5 A method for coordinating the splicing and merging of the last segment of an arch bridge comprises the following steps: Step 1, preliminary preparation, accurately measuring the last segment 1 of the arch bridge to determine the splicing position and merging point; using high-precision measuring instruments, laser rangefinders and total stations, preparing materials and tools required for splicing, and checking the status of mechanical equipment.

[0033] Step 2: Bracket setting and docking operations: Adjustment brackets 2 are set at both ends of the last segment 1 of the arch bridge; the bearing capacity of the adjustment bracket 2 is calculated using the following formula:

[0034] where F s is the bearing capacity of a single support, W t is the total weight of the segment, and n is the number of brackets. The last segment 1 is adjusted by using the laser rangefinder, total station, and the adjustment bracket 2 to achieve accurate docking of the segments at both ends. The adjustment amount is determined by calculating the errors of the segments at both ends. The calculation formula is:

[0035] Δx=x2-x1, Δy=y2-y1, Δz=z2-z1, where x1, y1, z1 and x2, y2, z2

[0036] are the coordinates of the two end segments respectively.

[0037] The adjustment bracket 2 comprises a bracket bottom plate 3 , a movable adjustment mechanism 4 is arranged on the top of the bracket bottom plate 3 , a splicing adjustment mechanism 5 is arranged on the top of the movable adjustment mechanism 4 , and clamping positioning mechanisms 6 are arranged at both ends of the bracket bottom plate 3 .

[0038] In order to realize the rapid installation and disassembly of the two ends of the adjusting bracket 2 and the segments to be spliced; a clamping and positioning mechanism 6 is set, including a lower clamping base 61 installed on the top of the two ends of the bracket base plate 3, and the four lower clamping bases 61 are distributed in a rectangular array. The top groove of the lower clamping base 61 contacts the bottom of the segment to be spliced, and a vertical guide rail 62 is fixedly installed on one side of the lower clamping base 61. A top plate 63 is fixedly installed on the top of the vertical guide rail 62, and a telescopic cylinder 64 is installed at the top height of the top plate 63. The telescopic bottom end of the telescopic cylinder 64 penetrates and extends to the bottom of the top plate 63.

[0039] Specifically implemented in this way, through the design of the lower clamping base 61, the arch bridge segment can be quickly placed in the predetermined position, thereby improving construction efficiency; the groove on the top of the lower clamping base 61 contacts the bottom of the segment, which helps to achieve accurate alignment of the segment and reduce splicing errors; through rapid installation and disassembly, the waiting time in construction is reduced and the progress of the project is accelerated; precise positioning and uniform load distribution help to ensure the quality of segment splicing and reduce rework caused by errors.

[0040] An upper clamping base 65 is fixedly installed at the telescopic bottom end of the telescopic cylinder 64, and the bottom groove of the upper clamping base 65 contacts the top of the segment to be spliced. A slider 66 is also fixedly installed on one side of the upper clamping base 65, and the surface of the slider 66 is slidably plugged into the surface of the vertical guide rail 62.

[0041] Specifically implemented in this way, the upper clamping base 65 and the lower clamping base 61 work together to form a double clamping of the upper and lower surfaces of the segment, thereby improving the stability and splicing accuracy of the segment; the bottom groove of the upper clamping base 65 contacts the top of the segment, thereby ensuring that the pressure on the segment during splicing is evenly distributed, thereby avoiding local stress concentration; through the upper and lower clamping, the segments can be better aligned during splicing, thereby reducing splicing errors and improving the accuracy of the overall structure; the automated adjustment reduces the risks of working at heights and manual adjustment, thereby improving the safety of construction workers.

[0042] In order to realize the movement and adjustment of the last segment 1 in the lateral and longitudinal directions, a movement and adjustment mechanism 4 is set, which includes a bearing seat 41 installed on the top of the bracket base plate 3. The four bearing seats 41 are distributed in a rectangular array, and the relative surfaces of every two bearing seats 41 are rotatably connected with a rotating shaft 42 through a bearing, and the arc surface of the rotating shaft 42 is threadedly connected with a connecting cross plate 43.

[0043] Specifically implemented in this way, through the cooperation of the rotating shaft 42 and the bearing, the movement and adjustment of the segment in both the lateral and longitudinal directions can be realized; through the threaded connection of the rotating shaft 42, the position of the segment can be adjusted quickly and conveniently, thereby improving the construction efficiency; precise multi-directional adjustment helps to ensure the accuracy of segment splicing, thereby ensuring the stability of the overall bridge structure.

[0044] A first drive motor 44 is fixedly installed on one side of one of the bearing seats 41, and the output end of the first drive motor 44 is fixedly installed on one end of the relative rotating shaft 42 through a coupling. The other ends of the two rotating shafts 42 are fixedly installed with first pulleys 45, and the inner walls of the grooves of the two first pulleys 45 are transmission-connected with first conveyor belts 46.

[0045] Specifically implemented in this way, the installation of the first drive motor 44 realizes the automation of segment movement and adjustment, reducing manual operation; the automated drive reduces the time of manual adjustment and speeds up the construction progress; the synchronous rotation and uniform power distribution help to accurately dock the segments and ensure the splicing quality.

[0046] The left and right top ends of the connecting horizontal plate 43 are fixedly mounted with bearing seats 47, and the four bearing seats 47 are distributed in a rectangular array. The surfaces of every two relative bearing seats 47 are rotatably connected with an adjusting shaft 48 through a bearing, and the arc surface of the adjusting shaft 48 is threadedly connected with a connecting longitudinal plate 49.

[0047] Specifically implemented in this way, the setting of the bearing seat 47 and the adjustment shaft 48 enables the connecting transverse plate 43 to be adjusted in the longitudinal direction, which increases the flexibility of adjustment; the combined design of the connecting transverse plate 43 and the connecting longitudinal plate 49 allows the segment to be accurately adjusted in both the transverse and longitudinal directions; through the adjustment shaft 48 and the threaded connection, the segment can be fine-tuned in the longitudinal direction to improve the accuracy of splicing; the more automated adjustment system reduces the risks of working at heights and manual adjustment, and improves the safety of construction workers.

[0048] A second drive motor 410 is fixedly installed on one side of one of the bearing seats 47, and the output end of the second drive motor 410 is fixedly installed on one end of a relative adjustment shaft 48 through a coupling. The other ends of the two adjustment shafts 48 are fixedly installed with second pulleys 411, and the inner walls of the grooves of the two second pulleys 411 are transmission-connected with second conveyor belts 412.

[0049] Specifically implemented in this way, the installation of the second drive motor 410 realizes the automatic adjustment of the segment in the longitudinal direction, improving the level of automation in construction; synchronous rotation and uniform power distribution help to accurately dock the segments in the longitudinal direction, ensuring the quality of splicing; automated adjustment reduces the risks of workers working at heights and manual adjustments, and improves construction safety.

[0050] In order to realize the vertical adjustment and splicing action of the last segment 1, a splicing adjustment mechanism 5 is set up, including an arc-shaped support plate 51, and the front and rear ends of the longitudinal plate 49 are fixedly installed with inclined side plates 52, and the top inclined surface of the inclined side plate 52 is provided with a driving groove 53, and the inner wall of the driving groove 53 is fixedly installed with an adjusting cylinder 54, and the telescopic top end of the adjusting cylinder 54 is fixedly installed with the bottom of the arc-shaped support plate 51; the top groove size of the multiple arc-shaped support plates 51 is adapted to the arc surface of the last segment 1, and the four arc-shaped support plates 51 are distributed at the four corners of the last segment 1.

[0051] Specifically implemented in this way, the combination of the arc support plate 51 and the adjustment cylinder 54 allows the segment to be precisely adjusted in the vertical direction; the four arc support plates 51 are distributed at the four corners of the segment, which can provide uniform support and adjustment; through fine adjustment in the vertical direction, the accuracy of segment splicing can be ensured and the stability of the overall structure can be improved; the mechanization of vertical adjustment reduces the risks of high-altitude operations and manual adjustments, and improves the safety of construction workers.

[0052] Operating principle of the adjustment bracket 2: During operation, the last segment 1 is hoisted by a lifting device and placed on the top of the arc-shaped support plate 51, and the adjusting cylinder 54 is used to adjust the vertical position and docking. The first drive motor 44 and the second drive motor 410 are used to move and adjust the lateral and longitudinal directions, thereby controlling the last segment 1 to be precisely docked with the segment connected with the connection; when the welding is completed after docking, the telescopic cylinder 64 can be retracted to drive the upper clamping base 65 to leave the clamping position for disassembly.

[0053] Step 3: synchronous lifting and positioning. Use a multi-point synchronous lifting system to lift the last segment 1 to the designed height, and position and fix it by adjusting the bracket 2. The control of the synchronous lifting system requires accurate calculation of the lifting speed and displacement, using the following formula: where v i is the speed of the i-th lifting point, Δh i is the lifting height, and t is the lifting time.

[0054] Step 4: Welding and fixing; After precise docking and positioning, the segment welding operation is carried out; After welding is completed, high-strength bolts are used for further fixing; The welding quality is verified by non-destructive testing; Ultrasonic testing and X-ray testing are used to perform non-destructive testing on the splicing and closure parts, and the qualified rate of the test results is calculated using the following formula: The quality inspection formula is: Among them, Q is the qualified rate, N pass is the number of qualified tests, N total is the total number of detections.

[0055] The invention improves the accuracy of splicing and closure, ensuring structural safety. The construction process is well coordinated, allowing fine-tuning of arch bridge segments in three-dimensional space to ensure splicing accuracy. Through precise adjustment and positioning, it reduces possible structural deviations and accident risks during construction, and reduces construction difficulty and risk. It improves construction efficiency, and precise docking operations help improve the overall structural quality and service life of the arch bridge and shorten construction period. Ensure welding quality and ensure construction quality through non-destructive testing.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for coordinating the splicing and connection of the last segment of an arch bridge, characterized in that: The method comprises the following steps: Step 1: Preliminary preparation: accurately measuring the last segment (1) of the arch bridge to determine the splicing position and the closure point; Use high-precision measuring instruments, such as laser rangefinders and total stations, to prepare materials and tools required for splicing and check the status of mechanical equipment; Step 2: bracket setting and docking operation: adjusting brackets (2) are set at both ends of the last segment (1) of the arch bridge; the bracket bearing capacity of the adjusting bracket (2) is calculated using the following formula: Among them, F s is the bearing capacity of a single support, W t is the total weight of the segment, and n is the number of brackets; the last segment (1) is adjusted by using a laser rangefinder, a total station, and an adjustment bracket (2) to achieve accurate docking of the segments at both ends; the adjustment amount is determined by calculating the errors of the segments at both ends, and the calculation formula is: Δx=x2-x1, Δy=y2-y1, Δz=z2-z1, where x1, y1, z1 and x2, y2, z2 are the coordinates of the two end segments respectively; Step 3: synchronous lifting and positioning. A multi-point synchronous lifting system is used to lift the last segment (1) to the designed height, and the last segment (1) is positioned and fixed by adjusting the bracket (2). The control of the synchronous lifting system requires accurate calculation of the lifting speed and displacement, using the following formula: where v i is the speed of the i-th lifting point, Δh i is the lifting height, t is the lifting time; Step 4: Welding and fixing; After precise docking and positioning, the segment welding operation is carried out; After welding is completed, high-strength bolts are used for further fixing; The welding quality is verified by non-destructive testing; Ultrasonic testing and X-ray testing are used to perform non-destructive testing on the splicing and closure parts, and the qualified rate of the test results is calculated using the following formula: The quality inspection formula is: Among them, Q is the qualified rate, N pass is the number of qualified tests, N total is the total number of detections.

2. The method for coordinating the splicing and joining of the last segment of an arch bridge according to claim 1, characterized in that: The adjustment bracket (2) comprises a bracket bottom plate (3), a movable adjustment mechanism (4) is arranged on the top of the bracket bottom plate (3), a splicing adjustment mechanism (5) is arranged on the top of the movable adjustment mechanism (4), and clamping positioning mechanisms (6) are arranged at both ends of the bracket bottom plate (3); The movement adjustment mechanism (4) realizes the movement adjustment of the last segment (1) in the transverse direction and the longitudinal direction; The splicing adjustment mechanism (5) realizes the action of adjusting the splicing of the last segment (1) in the vertical direction; The clamping and positioning mechanism (6) enables the two ends of the adjustment bracket (2) and the spliced ​​segments to be quickly installed and removed.

3. The method for coordinating the splicing and joining of the last segment of an arch bridge according to claim 2 is characterized in that: The clamping and positioning mechanism (6) includes a lower clamping base (61) installed on the top of both ends of the bracket base plate (3), and the four lower clamping bases (61) are distributed in a rectangular array. The top groove of the lower clamping base (61) contacts the bottom of the segment to be spliced. A vertical guide rail (62) is also fixedly installed on one side of the lower clamping base (61), and a top plate (63) is fixedly installed on the top of the vertical guide rail (62). A telescopic cylinder (64) is installed at the top height of the top plate (63), and the telescopic bottom end of the telescopic cylinder (64) penetrates and extends to the bottom of the top plate (63).

4. A coordinated operation method for splicing and joining the last segment of an arch bridge according to claim 3, characterized in that: An upper clamping base (65) is fixedly mounted on the telescopic bottom end of the telescopic cylinder (64), and a bottom groove of the upper clamping base (65) contacts the top of the segment to be spliced. A slider (66) is also fixedly mounted on one side of the upper clamping base (65), and a surface of the slider (66) is slidably plugged into a surface of the vertical guide rail (62).

5. The method for coordinating the splicing and joining of the last segment of an arch bridge according to claim 2, characterized in that: The movable adjustment mechanism (4) comprises a bearing seat (41) mounted on the top of the bracket base plate (3), wherein the four bearing seats (41) are arranged in a rectangular array, and the relative surfaces of every two bearing seats (41) are rotatably connected to a rotating shaft (42) via a bearing, and the arc surface of the rotating shaft (42) is threadedly connected to a connecting cross plate (43).

6. A coordinated operation method for splicing and joining the last segment of an arch bridge according to claim 5, characterized in that: A first drive motor (44) is fixedly mounted on one side of one of the bearing seats (41); an output end of the first drive motor (44) is fixedly mounted on one end of the rotating shaft (42) via a coupling; a first pulley (45) is fixedly mounted on the other end of the two rotating shafts (42); and the inner walls of the grooves of the two first pulleys (45) are transmission-connected to a first conveyor belt (46).

7. The method for coordinating the splicing and joining of the last segment of an arch bridge according to claim 5, characterized in that: The left and right top ends of the connecting transverse plate (43) are fixedly mounted with bearing seats 2 (47), and the four bearing seats 2 (47) are distributed in a rectangular array, and each two surfaces relative to the bearing seats 2 (47) are rotatably connected to an adjusting shaft (48) via a bearing, and the arc surface of the adjusting shaft (48) is threadedly connected to a connecting longitudinal plate (49).

8. The method for coordinating the splicing and joining of the last segment of an arch bridge according to claim 7, characterized in that: A second drive motor (410) is fixedly mounted on one side of one of the bearing seats (47); an output end of the second drive motor (410) is fixedly mounted on one end relative to the adjusting shaft (48) via a coupling; a second pulley (411) is fixedly mounted on the other end of the two adjusting shafts (48); and the inner walls of the grooves of the two second pulleys (411) are transmission-connected to a second conveyor belt (412).

9. The method for coordinating the splicing and joining of the last segment of an arch bridge according to claim 7, characterized in that: The splicing adjustment mechanism (5) comprises an arc-shaped support plate (51), and the front ends and the rear ends of the connecting longitudinal plate (49) are fixedly mounted with inclined side plates (52), and the top inclined surface of the inclined side plate (52) is provided with a driving groove (53), and the inner wall of the driving groove (53) is fixedly mounted with an adjusting cylinder (54), and the telescopic top end of the adjusting cylinder (54) is fixedly mounted with the bottom of the arc-shaped support plate (51).

10. A coordinated operation method for splicing and joining the last segment of an arch bridge according to claim 9, characterized in that: The size of the top grooves of the plurality of arc-shaped support plates (51) is adapted to the arc-shaped surface of the last segment (1), and the four arc-shaped support plates (51) are distributed at the four corners of the last segment (1).

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