Temporary bracing device for an inner-sloped arch bridge and construction method

Abstract

The application discloses a temporary cross bracing device for an inner-inclined arch bridge and a construction method, and belongs to the technical field of bridge construction. The device comprises chord bars arranged side by side, a plurality of web bars arranged between the two chord bars, a movable end assembly arranged at one end of the two chord bars, the movable end assembly comprising a movable end mounting plate, square steel pipes arranged side by side in the middle of the movable end mounting plate, one end of the square steel pipes being fixed to the movable end mounting plate, two rectangular slides arranged in the end part of the chord bar, the other end of the square steel pipes being slidably connected to the rectangular slides, the square steel pipes and the chord bar not being relatively rotated, fixed plates symmetrically arranged on the end part of the chord bar, one end of the fixed plates being fixed to the end part of the chord bar, the other end of the fixed plates extending to the outside of the chord bar, and jacks arranged between the fixed plates and the movable end mounting plate. The technical scheme is used to simplify the supporting steps of the arch rib and improve the construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, specifically relating to a temporary cross bracing device and construction method for an inward-inclined arch bridge. Background Technology

[0002] For inward-sloping arch bridges constructed using the cable-stayed method, the arch ribs will undergo inward lateral displacement under their own weight during the cantilever construction process. This displacement will have a significant impact on the arch rib alignment and is not conducive to controlling the arch alignment. Since the cable-stayed method has a very small adjustment range for the lateral displacement of the arch ribs, several temporary cross braces need to be installed during construction to control the lateral displacement of the arch ribs.

[0003] Conventional temporary cross bracing can only provide support. However, for inward-leaning arch bridges constructed using the inclined tie-down method, the inward displacement has already occurred before the temporary cross bracing is installed. Therefore, it is necessary to first use a jacking device to push the arch rib into place laterally before installing the temporary cross bracing. In this process, both the jacking device and the temporary cross bracing need to be hoisted to the designated position before construction can proceed. That is, multiple hoisting operations are required during the temporary support of the arch rib, which is not only cumbersome but also inefficient. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a temporary cross bracing device and construction method for an inwardly inclined arch bridge, so as to solve the problems of cumbersome support steps and low construction efficiency of the arch ribs in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention discloses a temporary cross bracing device for an inward-sloping arch bridge, comprising parallel chords, with a plurality of web members between the two chords. The two ends of each web member are fixedly connected to the two chords. Each of the two chords has a movable end assembly at one end. The movable end assembly includes a movable end mounting plate, with square steel tubes arranged side-by-side in the middle of the mounting plate. One end of each square steel tube is fixed to the movable end mounting plate. Two rectangular slide rails are provided within the ends of the chords, and the other ends of the square steel tubes are slidably connected within these rectangular slide rails, without any contact between the square steel tubes and the chords. For rotation, symmetrical fixing plates are provided on the ends of the chord members. One end of the fixing plate is fixed to the end of the chord member, and the other end of the fixing plate extends outward from the chord member. Jacks are provided between the fixing plate and the movable end mounting plate. The two ends of the jacks act on the movable end mounting plate and the fixing plate respectively to allow relative sliding between the square steel tube and the chord member, thereby realizing the jacking of the arch rib. Locking components are provided on the square steel tube and the chord member to restrict the relative sliding between the square steel tube and the chord member, thereby realizing stable support after jacking into place.

[0007] The end of the chord is provided with a partition plate. The side of the partition plate is fixedly connected to the inner wall of the chord plate. The upper and lower ends of the partition plate are respectively provided with an upper baffle and a lower baffle plate. One side of the upper baffle plate and the lower baffle plate is fixed to the partition plate, and the other side of the upper baffle plate and the lower baffle plate is fixed to the inner wall of the chord plate. A left baffle plate and a right baffle plate are respectively provided between the upper baffle plate and the lower baffle plate on both sides of the partition plate. The two sides of the left baffle plate and the right baffle plate are respectively fixed to the upper baffle plate and the lower baffle plate. The upper baffle plate, the lower baffle plate, the left baffle plate and the right baffle plate form two rectangular slides on both sides of the partition plate.

[0008] Furthermore, the locking assembly includes two sliding plates. One end of each sliding plate is fixed to one side of the two square steel tubes facing the fixed plate. The left and right baffles are provided with first sliding grooves, and the chord is symmetrically provided with second sliding grooves. The two sliding plates are respectively located in the first and second sliding grooves on both sides of the partition, and the other ends of the two sliding plates extend out of the chord and can slide along the length of the chord. The ends of the sliding plates located outside the chord are symmetrically provided with fixed ear plates. One side of the fixed ear plate is fixed to the sliding plate. Both the fixed ear plate and the fixed plate are provided with several mounting holes. Locking bolts are provided in the mounting holes. The locking bolts pass through the mounting holes on the fixed plate and the fixed ear plate. The locking bolts on both sides of the fixed ear plate are provided with first locking nuts and second locking nuts. The bolt between the fixed plate and the first locking nut is also provided with a third locking nut. The interaction between the first locking nut, the second locking nut, the third locking nut and the head end of the locking bolt is used to limit the relative sliding between the square steel tube and the chord.

[0009] Furthermore, the ends of the movable end mounting plate and the fixed plate are respectively provided with a first rotating shaft and a second rotating shaft, and a connecting shaft is provided between the first rotating shaft and the second rotating shaft. A first connecting rod and a second connecting rod are symmetrically provided on the first rotating shaft and the second rotating shaft. One end of the first connecting rod and the second connecting rod are respectively rotatably connected to the first rotating shaft and the second rotating shaft, and the other end of the first connecting rod and the second connecting rod are rotatably connected to the connecting shaft. The movable end mounting plate is provided with a slide rail, and a slide table is provided on the slide rail. The jack is set on the slide table. The outward end of the fixed plate is provided with a clearance groove to facilitate the passage of the jack. A return spring is provided between the end of the slide table and the end of the movable end mounting plate. A traction rope is provided on the end of the slide table. One end of the traction rope is fixed to the slide table, and the other end of the traction rope passes through the return spring and is fixed to the connecting shaft. The end of the movable end mounting plate is provided with a fixed pulley for moving and guiding the traction rope, and the traction rope is wound around the fixed pulley.

[0010] Furthermore, a limiting spring is provided between the sliding plate and the fixed plate, with both ends of the limiting spring fixed to the sliding plate and the fixed plate respectively. The limiting spring is used to provide a force to the sliding plate pointing towards the middle of the chord.

[0011] Furthermore, the other end of the string is provided with a fixed end assembly, which includes a fixed end mounting plate. The fixed end mounting plate is provided with a plurality of fixing blocks around its circumference. One end of the plurality of fixing blocks is fixed to the fixed end mounting plate. The other end of the string is located within the circular area formed by the plurality of fixing blocks, and the plurality of fixing blocks are fixed to the outer surface of the end of the string.

[0012] Furthermore, a fixed end bearing plate and a movable end bearing plate are respectively provided on the arch ribs at both ends of the chord. Both the fixed end bearing plate and the movable end bearing plate are fixed on the arch rib, and a support plate is provided parallel to both the fixed end bearing plate and the movable end bearing plate.

[0013] Furthermore, the movable end mounting plate is provided with a limiting cylinder, one end of which is fixed to the movable end mounting plate. The inner wall of the limiting cylinder is in contact with the outer wall of the two square steel pipes. The limiting cylinder and the fixed plate are respectively provided with a number of first reinforcing ribs and second reinforcing ribs. The first reinforcing ribs are fixed to the movable end mounting plate and the limiting cylinder, and the second reinforcing ribs are fixed to the outer surface of the fixed plate and the chord.

[0014] A construction method for a temporary cross bracing device for an inwardly inclined arch bridge includes the following construction steps:

[0015] S1. Hoist the temporary support device to the bottom of the two arch ribs of the arch bridge, and weld the movable end bearing plate and the fixed end bearing plate to the support points of the two arch ribs respectively.

[0016] S2. Slide the square steel pipe toward the inside of the chord, so that the movable end mounting plate is close to the end of the chord, thereby shortening the overall length of the temporary cross bracing device. Then, hoist the temporary cross bracing device upward as a whole, so that its two ends are located outside the support points of the two arch ribs, and place the two ends of the chord on the support plates of the fixed end bearing plate and the movable end bearing plate, respectively.

[0017] S3. Slide the square steel pipe outwards towards the chord to increase the overall length of the temporary cross bracing device, so that the movable end mounting plate and the fixed end mounting plate abut against the movable end bearing plate and the fixed end bearing plate respectively. Then, install the jack between the movable end mounting plate and the fixed plate, and through the jacking action, make the square steel pipe and the chord slide relative to each other, thereby further increasing the overall length of the temporary cross bracing device, thereby realizing the jacking of the arch ribs on both sides and adjusting the inward lateral displacement of the arch ribs.

[0018] S4. After the inward lateral displacement of the arch rib is adjusted to the correct position, the relative sliding between the square steel pipe and the chord is restricted by adjusting the positions of the first locking nut, the second locking nut and the third locking nut on the locking bolt, so that the square steel pipe and the chord form a whole. The movable end mounting plate and the fixed end mounting plate are welded and fixed to the movable end bearing plate and the fixed end bearing plate respectively, thereby achieving stable support for the arch ribs on both sides after the push is completed.

[0019] S5. Carry out the construction on the arch rib. After the construction is completed, cut off the weld points on the movable end mounting plate and the fixed end mounting plate, release the movement restriction between the square tube and the chord, move the square tube to the middle of the chord, so that the movable end mounting plate is separated from the movable end bearing plate, and then hoist the temporary support device away from the arch rib.

[0020] The beneficial effects of this invention are as follows:

[0021] In this technical solution, by setting a sliding square steel tube inside the chord, the overall length of the temporary cross bracing device can be changed. This not only allows for flexible hoisting after shortening the length, but also provides a pushing stroke for the temporary cross bracing device after it is hoisted to the designated position. In addition, with the use of locking components, the square steel tube and the chord can be locked to provide stable support. Thus, the temporary cross bracing device in this application not only facilitates hoisting, but also achieves the dual functions of pushing and supporting the arch rib. Moreover, it has a simple structure and ingenious design.

[0022] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0023] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0024] Figure 1 This is a three-dimensional schematic diagram of the temporary cross bracing device of the present invention acting on the arch rib;

[0025] Figure 2 This is a three-dimensional schematic diagram of the temporary cross bracing device of the present invention acting on the arch rib from another perspective;

[0026] Figure 3 This is a three-dimensional schematic diagram of the movable end portion of the temporary cross bracing device of the present invention;

[0027] Figure 4 This is a three-dimensional schematic diagram of the movable end portion of the temporary cross bracing device of the present invention from another perspective.

[0028] Figure 5 This is a three-dimensional schematic diagram of the steel pipe arrangement in the temporary cross bracing device of the present invention;

[0029] Figure 6 This is a three-dimensional schematic diagram of the rectangular slide rail arrangement in the temporary cross bracing device of the present invention;

[0030] Figure 7 This is a three-dimensional schematic diagram of the slide table and related components installed at the end of the movable end mounting plate in the temporary cross bracing device of the present invention.

[0031] The following labels are shown in the attached diagram:

[0032] 1. Arch rib; 2. Movable end bearing plate; 3. Movable end support plate; 4. Fixed end bearing plate; 5. Fixed end support plate; 6. Fixed end mounting plate; 7. Fixing block; 8. Chord member; 9. Web member; 10. Movable end mounting plate; 11. Limiting cylinder; 12. First reinforcing rib; 13. Square steel tube; 14. Sliding plate; 15. Fixed ear plate; 16. Mounting hole; 17. Jack; 18. Partition plate; 19. Lower baffle; 20. Upper baffle; 21. Left side baffle; 2 2. First slide groove; 23. Fixed plate; 24. Second reinforcing rib; 25. Locking bolt; 26. Third locking nut; 27. First locking nut; 28. Second locking nut; 29. ​​Limiting spring; 30. Second slide groove; 31. Slide table; 32. Slide rail; 33. Return spring; 34. Traction rope; 35. Fixed pulley; 36. First rotating shaft; 37. Second rotating shaft; 38. First connecting rod; 39. Second connecting rod; 40. Connecting shaft; 41. Clearance groove. Detailed Implementation

[0033] like Figures 1-7As shown, this invention discloses a temporary cross bracing device for an inward-inclined arch bridge, comprising chord members 8 arranged side by side, with several web members 9 positioned between the two chord members 8. The two ends of the web members 9 are respectively fixedly connected to the two chord members 8. Each of the two chord members 8 has a movable end assembly at one end. The movable end assembly includes a movable end mounting plate 10, with square steel tubes 13 arranged side by side in the middle of the movable end mounting plate 10. One end of the square steel tube 13 is fixed to the movable end mounting plate 10. Two rectangular slideways are provided within the ends of the chord members 8, and the other ends of the square steel tubes 13 are slidably connected within the rectangular slideways. No relative rotation occurs between the square steel tubes 13 and the chord members 8. A fixing plate 23 is symmetrically provided on the end of the rod 8. One end of the fixing plate 23 is fixed to the end of the chord 8, and the other end of the fixing plate 23 extends outward from the chord 8. A jack 17 is provided between the fixing plate 23 and the movable end mounting plate 10. The two ends of the jack 17 act on the movable end mounting plate 10 and the fixing plate 23 respectively to make relative sliding between the square steel tube 13 and the chord 8, thereby realizing the jacking of the arch rib 1. A locking component is provided on the square steel tube 13 and the chord 8. The locking component is used to restrict the relative sliding between the square steel tube 13 and the chord 8, thereby realizing stable support after jacking into place.

[0034] The working principle of the above technical solution is as follows:

[0035] When the temporary cross bracing device is hoisted to the designated support position, the movable end mounting plate 10 can be set close to the end of the chord 8 by utilizing the sliding and telescopic characteristics of the square steel tube 13 inside the chord 8. This is equivalent to shortening the overall length of the temporary cross bracing device, making it easier to hoist the temporary cross bracing device between the two arch ribs 1 without causing hoisting interference with the arch ribs 1.

[0036] When the temporary cross bracing device is pushed, since the components such as the chord 8 have been hoisted to the designated position, it is only necessary to slide the square steel pipe 13 outward so that the movable end mounting plate 10 and the fixed end mounting plate 6 contact the arch ribs 1 on both sides respectively. Then, the fixed plate 23 is pushed by the jack 17. At this time, the square steel pipe 13 is pulled outward, which is equivalent to further increasing the length of the temporary cross bracing device. Then, the arch ribs 1 on both sides can be pushed, thereby adjusting the inward lateral displacement of the arch ribs 1.

[0037] Once the inward lateral position of the arch rib 1 is adjusted to the correct position, the square steel tube 13 and the chord 8 can be "locked" by the locking assembly to prevent relative displacement between them, thus supporting the arch rib 1. It is easy to understand that even if the jack 17 is damaged by hydraulic loss or is removed, the temporary cross bracing device after locking can still provide stable support for the arch rib 1.

[0038] The technical effects achieved by the above technical solution are as follows:

[0039] In this technical solution, by setting a sliding square steel tube 13 inside the chord 8, the overall length of the temporary cross bracing device can be changed. This not only enables flexible hoisting after shortening the length, but also provides a pushing stroke for the temporary cross bracing device after it is hoisted to the designated position. In addition, with the use of the locking component, the square steel tube 13 and the chord 8 can be locked to provide stable support. Thus, the temporary cross bracing device in this application not only facilitates hoisting, but also achieves the dual functions of pushing and supporting the arch rib 1. Moreover, it has a simple structure and ingenious design.

[0040] In this specific embodiment, the method of constructing a rectangular slide rail inside the chord 8 is as follows:

[0041] A partition 18 is provided inside the end of the chord 8. The side of the partition 18 is fixedly connected to the inner wall of the chord 8. The upper end and the lower end of the partition 18 are respectively provided with an upper baffle 20 and a lower baffle 19. One side of the upper baffle 20 and the lower baffle 19 is fixed to the partition 18, and the other side of the upper baffle 20 and the lower baffle 19 is fixed to the inner wall of the chord 8. A left baffle 21 and a right baffle (drawn but not labeled) are respectively provided between the upper baffle 20 and the lower baffle 19 on both sides of the partition 18. The left baffle 21 and the right baffle are respectively fixed to the upper baffle 20 and the lower baffle 19. The upper baffle 20, the lower baffle 19, the left baffle 21 and the right baffle form two rectangular slides on both sides of the partition 18.

[0042] This method of constructing a rectangular slide rail inside the chord member 8, used in conjunction with the square steel tube 13, can prevent relative rotation between the square steel tube 13 and the chord member 8, thereby ensuring stability during hoisting, jacking, and support processes. Furthermore, the rectangular slide rail structure formed by welding together the partition plate 18, upper baffle 20, lower baffle 19, left baffle 21, and right baffle is structurally stable, has a strong load-bearing capacity, and can well meet the usage requirements during support and jacking processes.

[0043] In one feasible embodiment, the locking assembly includes two sliding plates 14. One end of each sliding plate 14 is fixed to one side of two square steel pipes 13 facing the fixed plate 23. The other ends of the two sliding plates 14 extend through the chord rod 8 and can slide along the length of the chord rod 8 (a first groove 22 is provided on the left baffle 21 and the right baffle, and a second groove 30 is symmetrically provided on the chord rod 8; the sliding plates 14 are respectively located in the first groove 22 and the second groove 30 on both sides of the partition 18). Fixed ear plates 15 are symmetrically provided on the ends of the sliding plates 14 outside the chord rod 8, and one side of the fixed ear plate 15 is fixed to the sliding plate 14. Both the fixed plate 23 and the fixed plate 5 are provided with several mounting holes 16. The mounting holes 16 are provided with locking bolts 25. The locking bolts 25 pass through the mounting holes 16 provided on the fixed plate 23 and the fixed ear plate 15. The locking bolts 25 on both sides of the fixed ear plate 15 are provided with a first locking nut 27 (located near the fixed plate 23) and a second locking nut 28. The bolt between the fixed plate 23 and the first locking nut 27 is also provided with a third locking nut 26. The interaction between the first locking nut 27, the second locking nut 28, the third locking nut 26 and the head end of the locking bolt 25 is used to limit the relative sliding between the steel pipe 13 and the chord 8.

[0044] The working principle of the above technical solution is as follows:

[0045] When the jack 17 performs the jacking operation, the sliding plate 14 slides within the first groove 22 and the second groove 30 to meet the relative movement requirements between the square steel tube 13 and the chord 8. After moving to the designated position, the locking bolt 25 is pushed to make the head end of the locking bolt 25 abut against the fixing plate 23. Then, the first locking nut 27 and the second locking nut 28 are tightened to clamp them onto the fixing ear plate 15. Then, the third locking nut 26 is rotated to engage with the head end of the locking bolt 25. The third locking nut 26 clamps onto the fixing plate 23, that is, the second locking nut 28 engages with the head end of the locking bolt 25, which can restrict the movement of the sliding plate 14 towards the middle of the chord 8. The use of the first nut and the third nut can restrict the movement of the sliding plate 14 towards the end of the chord 8, that is, the sliding plate 14 cannot move relative to the chord 8, that is, the square steel tube 13 cannot move relative to the chord 8, thereby achieving the locking of the two.

[0046] In one feasible embodiment, a first rotating shaft 36 and a second rotating shaft 37 are respectively provided on the ends of the movable end mounting plate 10 and the fixed plate 23. A connecting shaft 40 is provided on the outer side between the first rotating shaft 36 and the second rotating shaft 37. A first connecting rod 38 and a second connecting rod 39 are symmetrically provided on the first rotating shaft 36 and the second rotating shaft 37. One end of the first connecting rod 38 and the second connecting rod 39 are rotatably connected to the first rotating shaft 36 and the second rotating shaft 37, respectively. The other end of the first connecting rod 38 and the second connecting rod 39 are rotatably connected to the connecting shaft 40. A slide rail 3 is provided on the movable end mounting plate 10. 2. A slide table 31 is provided on the slide rail 32, and a jack 17 is set on the slide table 31. A clearance groove 41 is provided on the outward end of the fixed plate 23. A return spring 33 is provided between the end of the slide table 31 and the end of the movable end mounting plate 10. A traction rope 34 is provided on the end of the slide table 31. One end of the traction rope 34 is fixed on the slide table 31, and the other end of the traction rope 34 passes through the return spring 33 and is fixed on the connecting shaft 40. A fixed pulley 35 is provided at the end of the movable end mounting plate 10 to guide the movement of the traction rope 34. The traction rope 34 is wound around the fixed pulley 35.

[0047] The working principle of the above technical solution is as follows:

[0048] When the square steel pipe 13 moves toward the middle of the chord 8 (it can be manually moved and then initially locked by the locking assembly to prevent rebound during hoisting), the movable end mounting plate 10 and the fixed plate 23 move closer together. At this time, the angle between the first connecting rod 38 and the second connecting rod 39 decreases, causing the connecting shaft 40 to move outward, which in turn causes the traction rope 34 to pull the slide table 31 outward, which in turn causes the jack 17 on it to move outward, moving the jack 17 into the area of ​​the clearance groove 41. During the process of the movable end mounting plate 10 and the fixed plate 23 moving closer together, the jack 17 can enter the clearance groove 41, thus preventing the jack 17 from contacting the fixed plate 23 and causing the movement distance of the square steel pipe 13 toward the chord 8 to be limited by the height of the jack 17. This arrangement increases the retraction adjustment range of the square steel pipe 13, further shortening the length of the temporary cross bracing device. With greater flexibility, before jacking, the movable end mounting plate 10 needs to abut against the arch rib 1. At this time, the square steel pipe 13 is pulled outward, and the angle between the first connecting rod 38 and the second connecting rod 39 increases. The connecting shaft 40 moves inward, and the traction rope 34 becomes loose. Under the action of the return spring 33, it will push the slide 31 to return to its original position, so that the end of the jack 17 is located on the fixed plate 23 where the clearance groove 41 is not opened, thus realizing the jacking operation. Of course, during use, the length of the traction rope 34 can be adjusted to match the movement distance of the movable end mounting plate 10 to the fixed plate 23, as long as the end of the jack 17 enters the clearance groove 41 before contacting the fixed plate 23. It is easy to understand that the spacing of the arch ribs 1 on both sides may be inconsistent for different bridges, and the inward lateral displacement that has occurred during construction may be inconsistent. Therefore, this setting method can make this temporary cross bracing device applicable to a wider range.

[0049] In one feasible embodiment, a limiting spring 29 is provided between the sliding plate 14 and the fixed plate 23. The two ends of the limiting spring 29 are fixed to the sliding plate 14 and the fixed plate 23, respectively. The limiting spring 29 provides a force to the sliding plate 14 pointing towards the middle of the chord 8. The purpose of the limiting spring 29 is to ensure that the square steel tube 13 remains inside the chord 8 and prevents it from detaching.

[0050] In one feasible embodiment, the other end of the chord member 8 is provided with a fixed end assembly, which includes a fixed end mounting plate 6. Several fixing blocks 7 are arranged circumferentially on the fixed end mounting plate 6. One end of each fixing block 7 is fixed to the fixed end mounting plate 6. The other end of the chord member 8 is located within the circular area formed by the fixing blocks 7, and the fixing blocks 7 are fixed to the outer surface of the end of the chord member 8. Fixed end bearing plates 4 and movable end bearing plates 2 are respectively provided on the arch ribs 1 at both ends of the chord member 8. Both the fixed end bearing plates 4 and movable end bearing plates 2 are fixed to the arch ribs 1. Parallel support plates are provided on both the fixed end bearing plates 4 and movable end bearing plates 2. These support plates are specifically divided into movable end support plates 3 and fixed end support plates 5, which provide a certain supporting function and facilitate adjustment of the end position of the temporary cross bracing device. The movable end bearing plate 2 and the fixed end bearing plate 4 are both designed to increase the contact area and prevent the temporary cross bracing device from directly contacting the arch ribs 1, thus avoiding localized pressure damage to the arch ribs 1.

[0051] In one feasible embodiment, a limiting cylinder 11 is provided on the movable end mounting plate 10. One end of the limiting cylinder 11 is fixed to the movable end mounting plate 10, and the inner wall of the limiting cylinder 11 contacts the outer walls of the two square steel pipes 13. The limiting cylinder 11 and the fixed plate 23 are respectively provided with a plurality of first reinforcing ribs 12 and second reinforcing ribs 24. The first reinforcing ribs 12 are fixed to the movable end mounting plate 10 and the limiting cylinder 11, and the second reinforcing ribs 24 are fixed to the outer surfaces of the fixed plate 23 and the chord member 8. The limiting cylinder 11 and the first reinforcing ribs 12 are both designed to enhance the end bearing capacity and load-bearing capacity of the square steel pipes 13, ensuring a firm and reliable connection. The second reinforcing ribs 24 are designed to ensure the reliability of the connection between the fixed plate 23 and the chord member 8.

[0052] A construction method for a temporary cross bracing device for an inwardly inclined arch bridge includes the following construction steps:

[0053] S1. Hoist the temporary support device to the bottom of the two arch ribs 1 of the arch bridge, and weld the movable end bearing plate 2 and the fixed end bearing plate 4 to the support points of the two arch ribs 1 respectively.

[0054] S2. Slide the square steel pipe 13 into the inside of the chord 8 so that the movable end mounting plate 10 is close to the end of the chord 8, thereby shortening the overall length of the temporary cross bracing device. Then, hoist the temporary cross bracing device upward so that its two ends are located outside the support points of the two arch ribs 1, and place the two ends of the chord 8 on the support plates of the fixed end bearing plate 4 and the movable end bearing plate 2 respectively.

[0055] S3. Slide the square steel pipe 13 to the outside of the chord 8 to increase the overall length of the temporary cross bracing device, so that the movable end mounting plate 10 and the fixed end mounting plate 6 abut against the movable end bearing plate 2 and the fixed end bearing plate 4 respectively. Then, install the jack 17 between the movable end mounting plate 10 and the fixed plate 23, and through the pushing action of the jack 17, make the square steel pipe 13 and the chord 8 slide relative to each other, thereby increasing the overall length of the temporary cross bracing device in an implementable manner, thereby realizing the pushing of the two side arch ribs 1 and adjusting the inward lateral displacement of the arch ribs 1.

[0056] S4. After the inward lateral displacement of the arch rib 1 is adjusted to the correct position, the relative sliding between the square steel pipe 13 and the chord 8 is restricted by adjusting the positions of the first locking nut 27, the second locking nut 28 and the third locking nut 26 on the locking bolt 25, so that the square steel pipe 13 and the chord 8 form a whole. The movable end mounting plate 10 and the fixed end mounting plate 6 are welded and fixed to the movable end bearing plate 2 and the fixed end bearing plate 4 respectively, thereby achieving stable support for the arch ribs 1 on both sides after the push is completed.

[0057] S5. Carry out the construction on the arch rib 1. After the construction is completed, cut off the weld points on the movable end mounting plate 10 and the fixed end mounting plate 6, release the movement restriction between the square tube and the chord 8, move the square tube to the middle of the chord 8, so that the movable end mounting plate 10 is separated from the movable end bearing plate 2, and then hoist the temporary support device away from the arch rib 1.

[0058] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A temporary cross bracing device for an inward-inclined arch bridge, characterized in that: The system includes parallel chord members, with several web members between the two chord members. The ends of each web member are fixedly connected to the two chord members. Each chord member has a movable end assembly at one end. The movable end assembly includes a movable end mounting plate, with square steel tubes arranged side-by-side in the middle of the mounting plate. One end of each square steel tube is fixed to the mounting plate. Two rectangular slides are provided within the ends of the chord members, and the other ends of the square steel tubes are slidably connected within these slides. No relative rotation occurs between the square steel tubes and the chord members. Symmetrical fixing plates are provided at the ends. One end of the fixing plate is fixed to the end of the chord, and the other end of the fixing plate extends outward from the chord. Jacks are provided between the fixing plate and the movable end mounting plate. The two ends of the jacks act on the movable end mounting plate and the fixing plate respectively to allow relative sliding between the square steel tube and the chord, thereby realizing the jacking of the arch rib. Locking components are provided on the square steel tube and the chord to restrict the relative sliding between the square steel tube and the chord, thereby achieving stable support after the jacking is in place. The end of the chord is provided with a partition plate. The side of the partition plate is fixedly connected to the inner wall of the chord plate. The upper and lower ends of the partition plate are respectively provided with an upper baffle and a lower baffle plate. One side of the upper baffle and the lower baffle plate is fixed to the partition plate, and the other side of the upper baffle and the lower baffle plate is fixed to the inner wall of the chord plate. A left baffle plate and a right baffle plate are respectively provided between the upper baffle and the lower baffle plate on both sides of the partition plate. The two sides of the left baffle plate and the right baffle plate are respectively fixed to the upper baffle plate and the lower baffle plate. The upper baffle plate, the lower baffle plate, the left baffle plate and the right baffle plate form two rectangular slides on both sides of the partition plate. The locking assembly includes two sliding plates. One end of each sliding plate is fixed to one side of the two square steel tubes facing the fixed plate. The left and right baffles are provided with first sliding grooves, and the chord rod is symmetrically provided with second sliding grooves. The two sliding plates are located within the first and second sliding grooves on both sides of the baffle, and the other ends of the two sliding plates extend beyond the chord rod and can slide along its length. The ends of the sliding plates outside the chord rod are symmetrically provided with fixing lugs. One side of each fixing lug is fixed to the sliding plate. Both the fixing lugs and the fixed plate are provided with several mounting holes, and locking bolts are installed in these mounting holes. The locking bolts pass through the mounting holes provided on the fixing plate and the fixing ear plate. The locking bolts on both sides of the fixing ear plate are provided with a first locking nut and a second locking nut. The bolt between the fixing plate and the first locking nut is also provided with a third locking nut. The interaction between the first locking nut, the second locking nut, the third locking nut and the head end of the locking bolt is used to limit the relative sliding between the square steel pipe and the chord. The arch ribs at both ends of the chord are respectively provided with a fixed end bearing plate and a movable end bearing plate. Both the fixed end bearing plate and the movable end bearing plate are fixed to the arch rib. Both the fixed end bearing plate and the movable end bearing plate are provided with parallel support plates.

2. The temporary cross bracing device for an inward-sloping arch bridge according to claim 1, characterized in that: The movable end mounting plate and the fixed plate are respectively provided with a first rotating shaft and a second rotating shaft at their ends. A connecting shaft is provided between the first rotating shaft and the second rotating shaft. A first connecting rod and a second connecting rod are symmetrically provided on the first rotating shaft and the second rotating shaft. One end of the first connecting rod and the second connecting rod are rotatably connected to the first rotating shaft and the second rotating shaft, respectively. The other end of the first connecting rod and the second connecting rod are rotatably connected to the connecting shaft. The movable end mounting plate is provided with a slide rail. A slide table is provided on the slide rail. The jack is set on the slide table. The fixed plate has an outward end with a clearance groove to facilitate the passage of the jack. A return spring is provided between the end of the slide table and the end of the movable end mounting plate. A traction rope is provided at the end of the slide table. One end of the traction rope is fixed to the slide table. The other end of the traction rope passes through the return spring and is fixed to the connecting shaft. The end of the movable end mounting plate is provided with a fixed pulley to guide the movement of the traction rope. The traction rope is wound around the fixed pulley.

3. The temporary cross bracing device for an inward-sloping arch bridge according to claim 1, characterized in that: A limiting spring is provided between the sliding plate and the fixed plate. The two ends of the limiting spring are fixed to the sliding plate and the fixed plate respectively. The limiting spring is used to provide a force to the sliding plate pointing towards the middle of the chord.

4. The temporary cross bracing device for an inwardly inclined arch bridge according to claim 1, characterized in that: The other end of the string is provided with a fixed end assembly, which includes a fixed end mounting plate. The fixed end mounting plate is provided with a plurality of fixing blocks around its circumference. One end of the plurality of fixing blocks is fixed to the fixed end mounting plate. The other end of the string is located within the circular area formed by the plurality of fixing blocks, and the plurality of fixing blocks are fixed to the outer surface of the end of the string.

5. A temporary cross bracing device for an inwardly inclined arch bridge according to claim 1, characterized in that: The movable end mounting plate is provided with a limiting cylinder. One end of the limiting cylinder is fixed to the movable end mounting plate. The inner wall of the limiting cylinder is in contact with the outer wall of the two square steel pipes. The limiting cylinder and the fixed plate are respectively provided with a number of first reinforcing ribs and second reinforcing ribs. The first reinforcing ribs are fixed to the movable end mounting plate and the limiting cylinder, and the second reinforcing ribs are fixed to the outer surface of the fixed plate and the chord.

6. A construction method for a temporary cross bracing device for an inwardly inclined arch bridge according to any one of claims 1-5, characterized in that: The construction steps include the following: S1. The temporary support device in claims 1-5 is hoisted to the bottom of the two arch ribs of the arch bridge, and the movable end bearing plate and the fixed end bearing plate are respectively welded to the support points of the two arch ribs. S2. Slide the square steel pipe toward the inside of the chord, so that the movable end mounting plate is close to the end of the chord, thereby shortening the overall length of the temporary cross bracing device. Then, hoist the temporary cross bracing device upward as a whole, so that its two ends are located outside the support points of the two arch ribs, and place the two ends of the chord on the support plates of the fixed end bearing plate and the movable end bearing plate, respectively. S3. Slide the square steel pipe outwards towards the chord to increase the overall length of the temporary cross bracing device, so that the movable end mounting plate and the fixed end mounting plate abut against the movable end bearing plate and the fixed end bearing plate respectively. Then, install the jack between the movable end mounting plate and the fixed plate, and through the jacking action, make the square steel pipe and the chord slide relative to each other, thereby further increasing the overall length of the temporary cross bracing device, thereby realizing the jacking of the arch ribs on both sides and adjusting the inward lateral displacement of the arch ribs. S4. After the inward lateral displacement of the arch rib is adjusted to the correct position, the relative sliding between the square steel pipe and the chord is restricted by adjusting the positions of the first locking nut, the second locking nut and the third locking nut on the locking bolt, so that the square steel pipe and the chord form a whole. The movable end mounting plate and the fixed end mounting plate are welded and fixed to the movable end bearing plate and the fixed end bearing plate respectively, thereby achieving stable support for the arch ribs on both sides after the push is completed. S5. Carry out the construction on the arch rib. After the construction is completed, cut off the weld points on the movable end mounting plate and the fixed end mounting plate, release the movement restriction between the square tube and the chord, move the square tube to the middle of the chord, so that the movable end mounting plate is separated from the movable end bearing plate, and then hoist the temporary support device away from the arch rib.

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