Steel tube arch bridge arch rib closure connecting device and construction method thereof

Abstract

This invention relates to the field of arch bridge closure construction technology, and discloses a steel pipe arch bridge arch rib closure connection device, including a main chord pipe, a connecting pipe, a main chord pipe closure connection device for connecting two main chord pipes, and a connecting pipe closure connection device for connecting two connecting pipes. Two parallel main chord pipes are fixedly connected by the connecting pipe. Connecting plates can be detachably installed inside both main chord pipes. The main chord pipe closure connection device includes an internal threaded sleeve and a connecting assembly. With the cooperation of a convex ring, a wear-resistant ring, a limiting ring, a retaining ring, and a screw, the distance between the two connecting columns can be limited. The two connecting columns can only rotate along their axes. A collar is provided to facilitate the rotation of the connecting columns by construction personnel. Both connecting columns can rotate without affecting each other. The connecting columns can be threadedly connected to the internal threaded sleeve, resulting in strong stability after connection.

Description

Technical Field

[0001] This invention relates to the field of arch bridge closure construction technology, specifically a steel pipe arch bridge arch rib closure connection device and its construction method. Background Technology

[0002] With my country's economic development, technological progress, and ever-increasing transportation demands, steel pipe arch bridges are increasingly being used in bridge construction, particularly for spanning major rivers and deep valleys, due to their advantages such as large span capacity, low steel consumption, and convenient assembly. In the construction of steel pipe arch bridges, the closure connection of the arch ribs must consider factors such as structural strength, stability, and durability. The closure connection of the arch ribs is one of the most crucial quality and safety control points in arch bridge construction, determining the success or failure of the entire project.

[0003] To address this issue, Chinese Patent No. CN115627700A discloses a truss-type steel pipe arch bridge centering and closure structure and construction method. The screw rods are threaded to nuts at both ends, allowing for dynamic adjustment based on local temperature, precise alignment, high welding quality, and ensuring the overall structural safety after closure. However, after one end of the screw rod is threaded to one nut, connecting the other end to another nut presents a problem: the screw rod cannot be fully connected to the nut, resulting in a large gap between them and poor stability after connection. This has become a pressing technical problem to be solved.

[0004] Therefore, it is necessary to provide a steel pipe arch bridge arch rib closure connection device and its construction method to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a steel pipe arch bridge arch rib closure connection device and its construction method, which has the effect of good connection stability.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a steel pipe arch bridge arch rib closure connection device, comprising a main chord pipe, a connecting pipe, a main chord pipe closure connection device for connecting two main chord pipes, and a connecting pipe closure connection device for connecting two connecting pipes. Two parallel main chord pipes are fixedly connected by the connecting pipe. Connecting plates are detachably installed inside both main chord pipes. The main chord pipe closure connection device includes an internal threaded sleeve and a connecting assembly. An internal threaded sleeve is fixedly connected to one side of the two connecting plates that are close to each other. A connecting assembly is provided between the two internal threaded sleeves. The connecting assembly includes two connecting posts. An external thread adapted to the connecting post is opened on the outer wall of the connecting post near the internal threaded sleeve. An integrally formed convex ring is provided on the outer wall of the two connecting posts that are close to each other. A limiting ring for limiting the convex ring is detachably installed on the outer side of the convex ring.

[0007] A further feature of the present invention is that a wear-resistant ring is provided between the limiting ring and the convex ring, and a retaining ring is provided on each side of the two convex rings that are far apart from each other, and a plurality of screws are provided on the retaining ring for fixing it to the limiting ring.

[0008] A further feature of the present invention is that a gap is provided between the retaining ring and the convex ring, and a collar fixedly sleeved on the outer wall of the connecting column is provided between the retaining ring and the internal threaded sleeve.

[0009] A further feature of the present invention is that a reinforcing rod is horizontally arranged between the two connecting columns, and a cavity adapted to the reinforcing rod is opened inside the connecting column. Multiple reinforcing plates are arranged in a ring array with equal spacing inside the main chord tube.

[0010] A further feature of the present invention is that the pipe closure connection device includes a stiffening plate and a connecting ear plate. A stiffening plate is installed on one side of the two pipes near the closure section. Each stiffening plate has multiple bolt holes. Two opposite stiffening plates are connected by a connecting ear plate. A bolt is provided on the connecting ear plate, and the bolt passes through the bolt hole.

[0011] A further configuration of the present invention includes: an inner cylinder fixedly installed on the collar, the inner cylinder penetrating one side of the collar's ring wall, and one end of the inner cylinder extending into the interior of the connecting post; a pressure rod slidably installed inside the inner cylinder; an arc-shaped pressure plate fixedly installed at the bottom end of the pressure rod; an anti-slip pad fixedly installed at the bottom end of the arc-shaped pressure plate; an outer cylinder fixedly installed inside the connecting post; the inner cylinder disposed inside the outer cylinder; a slider fixedly installed on the side wall of the pressure rod; one side of the slider extending into the outer cylinder; a spring fixedly installed inside the outer cylinder; the slider elastically connected to the top wall of the outer cylinder via the spring; and an adjustment assembly for adjusting the position of the pressure rod provided inside the inner cylinder.

[0012] A further configuration of the present invention is as follows: the adjusting assembly includes a connecting rod, a connecting pin, and an L-shaped seat; two connecting rods are provided and arranged in an X-shape; the connecting pin passes through the middle of the two connecting rods and is rotatably connected to the connecting rod; both ends of the connecting pin are rotatably connected to the inner cylinder wall; pull rods are rotatably installed at the bottom ends of both connecting rods; four L-shaped seats are fixedly installed at the top end of the pressure rod; and both ends of the pull rod extend into two L-shaped seats on both sides of the pull rod.

[0013] A further feature of the present invention is that an adjusting rod is provided at the top of the inner cylinder, the bottom of the adjusting rod extends into the inner cylinder, and the bottom of the adjusting rod is threadedly connected to the inner cylinder, and a handle is fixedly installed at the top of the adjusting rod.

[0014] The construction method of the above-mentioned steel pipe arch bridge arch rib closure connection device includes the following steps:

[0015] S1. According to the design drawings of each component of the steel pipe arch bridge arch rib closure connection device, the steel structure processing plant will carry out mold matching, cutting and material preparation, and pre-closure will be carried out in the horizontal assembly area;

[0016] S2. The closure section is lifted to the installation position using a cable crane, and real-time monitoring and measurement are carried out. The horizontal accuracy is adjusted by using tool ropes and the vertical accuracy is adjusted by using fastening ropes to ensure that the axial position, elevation and arch rib deformation of the closure section of the two arch ribs are consistent. At this time, the installation is in place.

[0017] S3. During the closure of the arch rib of the steel pipe arch, the arch ribs on both sides are locked instantly by the pipe closure connection device. Bolt holes are drilled on the stiffening plates on both sides and bolt holes are drilled on one side of the connecting ear plate. The connecting ear plate on the side with the drilled hole is first aligned with the bolt of the stiffening plate on the pipe and bolted. After the forced closure measures are taken to correct the horizontal and vertical alignment error, the connecting ear plate on the side without the drilled hole is aligned with the bolt hole of the stiffening plate on the pipe. The bolt holes are drilled on the connecting ear plate on site and the bolts are tightened by a torque wrench to complete the bolting.

[0018] S4. Select a suitable temperature and weld the code plate to the outside of the main chord tube to fix the closure joint;

[0019] S5. Measure the actual dimensions of the closure joint, determine the cutting position of the upper and lower chord pipe fitting sections, connect the upper and lower chord pipes using the main chord pipe closure connection device, fully weld and fix the reinforcing plate to the inner wall of the main chord pipe, install the connecting plate and the internal threaded sleeve, and install the connecting component between the internal threaded sleeves. Through the mutual cooperation of the convex ring, wear-resistant ring, limit ring, retaining ring and screw, the arch rib is quickly closed and connected.

[0020] S6. After welding the main chord pipe closure section and inserting the pipe, cut off the code plate outside the main chord pipe.

[0021] In summary, the present invention has the following beneficial effects:

[0022] 1. With the cooperation of a convex ring, a wear-resistant ring, a limiting ring, a retaining ring, and a screw, the present invention can limit the distance between two connecting columns. The two connecting columns can only rotate along their axes. A collar is provided to facilitate the rotation of the connecting columns by construction personnel. Both connecting columns can rotate without affecting each other. The connecting columns can be threaded together with the internal threaded sleeve, and the stability after connection is strong.

[0023] 2. With the cooperation of the connecting plate and the reinforcing plate, the reinforcing plate is fixed to the inner wall of the main chord tube, and the connecting plate is installed on one side of the internal threaded sleeve. The full welding between the two connecting plates and the reinforcing plate further enhances the stability of the main chord tube. The main chord tube closure connection reserves a channel for the pumping of steel pipe concrete. The closure device, the main chord tube and the concrete form a whole.

[0024] 3. The arch closure of this invention adopts a pipe-jointing connection device to instantly lock the arch tops on both sides, and then completes the arch rib closure through the main chord pipe closure connection device. This device achieves the locking of the closure joint in stages, with a reasonable structure, convenient connection, and simple operation. Under the premise of ensuring high-precision closure of the arch rib, it can quickly realize the conversion of the arch rib closure system, ensuring the structural bearing capacity of the arch rib closure, and achieving efficient construction and cost savings.

[0025] 4. The present invention, through the setting of the arc-shaped pressure plate and the adjustment component, can effectively prevent the overall vibration and displacement of the closure connection device, improve stability and structural strength, improve the convenience of closure connection, and ensure the overall stability and structural strength of the device, significantly improving the efficiency of closure construction. When it is necessary to rotate the collar, the adjustment rod can be pulled by holding the rod to rotate, thereby driving the collar to rotate, making the rotation of the collar more labor-saving and convenient. When installing the adjustment rod, the locking between the connecting column and the reinforcing rod can be automatically released, making the operation convenient. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention;

[0028] Figure 3 This is a schematic diagram of the main chord tube and the limiting ring of the present invention;

[0029] Figure 4 This is a schematic diagram of the main chord tube and connecting plate of the present invention;

[0030] Figure 5 This is a cross-sectional structural diagram of the main chord tube and connecting column of the present invention;

[0031] Figure 6 This is an exploded structural diagram of the main chord closure device of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of the lacing tube, stiffening plate, and connecting lug plate of the present invention;

[0033] Figure 8 This is a cross-sectional structural schematic diagram of the main chord closure device according to another embodiment of the present invention;

[0034] Figure 9 For the present invention Figure 8 A magnified structural diagram at point A;

[0035] Figure 10 For the present invention Figure 9 A magnified structural diagram at point B;

[0036] Figure 11This is a top view of the pressure bar and adjustment assembly of the present invention.

[0037] In the diagram: 1. Main chord tube; 2. Connecting plate; 3. Internal threaded sleeve; 4. Connecting column; 5. External thread; 6. Convex ring; 7. Limiting ring; 8. Wear-resistant ring; 9. Retaining ring; 10. Screw; 11. Collar; 12. Reinforcing rod; 13. Cavity; 14. Reinforcing plate; 15. Connecting tube; 16. Stiffening plate; 17. Connecting ear plate; 18. Bolt; 19. Inner cylinder; 20. Adjusting rod; 21. Pressure rod; 22. Arc-shaped pressure plate; 23. Anti-slip pad; 24. Handle; 25. Outer cylinder; 26. Spring; 27. Slider; 28. Connecting pin; 29. ​​Connecting rod; 30. Pull rod; 31. L-shaped seat. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] Please see Figures 1-4 In this embodiment of the invention, a steel pipe arch bridge arch rib closure connection device includes a main chord pipe 1, a connecting pipe 15, a main chord pipe closure connection device for connecting two main chord pipes 1, and a connecting pipe closure connection device for connecting two connecting pipes 15. Two parallel main chord pipes 1 are fixedly connected by connecting pipes 15. Connecting plates 2 are detachably installed inside both main chord pipes 1, and detachable connection can be achieved by using bolts 18. The main chord pipe 1 closure connection device includes an internal threaded sleeve 3 and a connecting assembly. An internal threaded sleeve 3 is fixedly connected to the side of the two connecting plates 2 that are close to each other. A connecting assembly is provided between the two internal threaded sleeves 3. The connecting assembly includes two connecting posts 4. An external thread 5 adapted to the connecting post 4 is opened on the outer wall of the internal threaded sleeve 3 near the connecting post 4. An integrally formed convex ring 6 is provided on the outer wall of the side of the two connecting posts 4 that are close to each other. A limiting ring 7 for limiting the convex ring 6 is detachably installed on the outer side of the convex ring 6.

[0040] In this embodiment, preferably, a wear-resistant ring 8 is provided between the limiting ring 7 and the convex ring 6, and a retaining ring 9 is provided on each side of the two convex rings 6 that are far apart from each other. The retaining ring 9 is provided with a plurality of screws 10 for fixing it to the limiting ring 7. With the cooperation of the convex ring 6, the wear-resistant ring 8, the limiting ring 7, the retaining ring 9 and the screws 10, the distance between the two connecting columns 4 can be limited. The two connecting columns 4 can only rotate along their axes. The surface of the wear-resistant ring 8 is made of wear-resistant material, which can reduce the wear caused by the rotation of the convex ring 6. A gap is provided between the retaining ring 9 and the convex ring 6. The gap is provided to avoid the retaining ring 9 squeezing the connecting column 4 and affecting the rotation of the connecting column 4. A collar 11 is provided between the retaining ring 9 and the internal threaded sleeve 3 and is fixedly sleeved on the outer wall of the connecting column 4. The collar 11 is provided so that the workers can rotate the connecting column 4 through the collar 11. Both connecting columns 4 can rotate without affecting each other. The connecting column 4 can be threadedly connected to the internal threaded sleeve 3 to realize the rapid closure connection of the arch bridge.

[0041] Please see Figures 5-7 In this embodiment of the invention, a reinforcing rod 12 is horizontally arranged between the two connecting columns 4. The connecting column 4 has an internal cavity 13 adapted to the reinforcing rod 12. The reinforcing rod 12 enhances the stability of the connection between the two connecting columns 4. Multiple reinforcing plates 14 are arranged in a circular array with equal spacing inside the main chord tube 1. The reinforcing plates 14 are fully welded to the inner wall of the main chord tube 1. The reinforcing plates 14 establish a connection between the closure sections of the two main chord tubes 1, further enhancing the strength and stability of the main chord tube 1. A connecting plate 2 is fixedly connected to the side of the reinforcing plate 14 near the closure section. The gap between the connecting plate 2 and the reinforcing plate 14 facilitates the pumping of steel-concrete composite, forming a stable steel-concrete composite structure.

[0042] In this embodiment, preferably, the closure connection device for the connecting pipes 15 includes stiffening plates 16 and connecting lugs 17. Stiffening plates 16 are installed on one side of the two connecting pipes 15 near the closure section. Each connecting pipe 15 has two stiffening plates 16, and each stiffening plate 16 has multiple bolt holes 18. Two opposing stiffening plates 16 are connected by connecting lugs 17, which are equipped with bolts 18 that pass through the bolt holes 18. By providing stiffening plates 16 with pre-drilled bolt holes 18, the distance between the two connecting pipes 15 can be shortened, increasing the feasibility of the closure connection. The bolts 18 are bolted by inserting into the pre-drilled bolt holes 18 in the connecting lugs 17 and stiffening plates 16. By providing connecting lugs 17, the two connecting pipes 15 are connected as a whole, completing the instantaneous locking of the arch closure on both banks.

[0043] Since the two connecting columns 4 can rotate relative to each other, they may rotate relative to each other during construction due to vibration. This could cause the entire closure connection device to vibrate and shift, which would affect the stress on the device and reduce the overall structural strength. Furthermore, since the connecting columns 4 have a large mass, it is quite difficult to drive them to rotate using only the collar 11. To solve these problems, the following embodiments are provided.

[0044] Please see Figures 8-11 In this embodiment of the invention, an inner cylinder 19 is fixedly installed on the collar 11. The inner cylinder 19 penetrates one side of the collar 11, and one end of the inner cylinder 19 extends into the interior of the connecting post 4. A pressure rod 21 is slidably installed inside the inner cylinder 19. An arc-shaped pressure plate 22 is fixedly installed at the bottom end of the pressure rod 21. An anti-slip pad 23 is fixedly installed at the bottom end of the arc-shaped pressure plate 22. The anti-slip pad 23 is made of rubber. When the adjusting rod 20 is not inserted into the inner cylinder 19, the anti-slip pad 23 presses against the reinforcing rod 12, so that the reinforcing rod 12 and the connecting post 4 are aligned. The connecting column 4 is difficult to rotate. An outer cylinder 25 is fixedly installed inside the connecting column 4. An inner cylinder 19 is located inside the outer cylinder 25. A slider 27 is fixedly installed on the side wall of the pressure rod 21. One side of the slider 27 extends into the outer cylinder 25. A spring 26 is fixedly installed inside the outer cylinder 25. The slider 27 is elastically connected to the top wall of the outer cylinder 25 through the spring 26. A through groove is provided on the inner cylinder 19 for the slider 27 to slide up and down. An adjustment component for adjusting the position of the pressure rod 21 is provided inside the inner cylinder 19.

[0045] In this embodiment, preferably, the adjusting assembly includes a connecting rod 29, a connecting pin 28, and an L-shaped seat 31. There are two connecting rods 29 arranged in an X-shape. The connecting pin 28 passes through the middle of the two connecting rods 29 and is rotatably connected to the connecting rod 29. The two ends of the connecting pin 28 are rotatably connected to the cylinder wall of the inner cylinder 19. A pull rod 30 is rotatably installed at the bottom end of each of the two connecting rods 29. Four L-shaped seats 31 are fixedly installed at the top end of the pressure rod 21. The two ends of the pull rod 30 extend into the two L-shaped seats 31 on both sides of it.

[0046] In this embodiment, preferably, an adjusting rod 20 is provided at the top of the inner cylinder 19, the bottom of the adjusting rod 20 extends into the inner cylinder 19, and the bottom of the adjusting rod 20 is threadedly connected to the inner cylinder 19. A handle 24 is fixedly installed at the top of the adjusting rod 20. The adjusting rod 20 can be detached from the inner cylinder 19 for repeated use.

[0047] When the rotating connecting column 4 is inserted into the internal threaded sleeve 3, the adjusting rod 20 is first rotated into the inner cylinder 19. As the adjusting rod 20 moves downward, the bottom end of the adjusting rod 20 presses against the top ends of the two connecting rods 29, causing the two connecting rods 29 to rotate. This causes the pull rods 30 at the bottom ends of the two connecting rods 29 to move upward. When the pull rods 30 move, they pull the L-shaped seat 31 upward, which in turn pulls the arc-shaped pressure plate 22 upward through the pressure rod 21. This causes the anti-slip pad 23 to separate from the reinforcing rod 12, allowing the reinforcing rod 12 and the connecting column 4 to rotate relative to each other. This allows the two connecting columns 4 to rotate relative to each other, making it easier to rotate the connecting column 4 into the internal threaded sleeve 3. After installation, the adjusting rod 20 can be removed from the inner cylinder 19. At this time, under the elastic action of the spring 26, the slider 27 pushes the pressure rod 21 downward, which in turn moves the arc-shaped pressure plate 22 downward, causing the anti-slip pad 23 to press against the reinforcing rod 12. On rod 12, the two connecting columns 4 and the reinforcing rod 12 cannot rotate relative to each other, thus preventing the two connecting columns 4 from rotating relative to each other. The two ends of the closure connection device are always squeezed by the arch rib of the steel pipe arch bridge. Under pressure, the closure connection device as a whole is difficult to rotate, so the connecting columns 4 cannot rotate relative to each other or rotate as a whole. This effectively prevents the closure connection device from vibrating and shifting, improving stability and structural strength. Through the above structure, the convenience of closure connection is improved, and the overall stability and structural strength of the device are guaranteed, significantly improving the efficiency of closure construction. When it is necessary to rotate the collar 11, the adjusting rod 20 can be pulled by the gripping rod 24 to rotate, thereby driving the collar 11 to rotate, making the rotation of the collar 11 more labor-saving and convenient. When the adjusting rod 20 is installed, the locking between the connecting column 4 and the reinforcing rod 12 can be automatically released, making the operation convenient.

[0048] This invention also provides a construction method for the closure connection of the arch ribs of a steel pipe arch bridge, the construction method comprising the following steps:

[0049] S1. According to the design drawings of each component of the steel pipe arch bridge arch rib closure connection device, the steel structure processing plant will carry out mold matching, cutting and material preparation, and pre-closure will be carried out in the horizontal assembly area;

[0050] S2. The closure section is lifted to the installation position using a cable crane, with real-time monitoring and measurement. Planar accuracy is adjusted using tool cables, and longitudinal accuracy is adjusted using tie cables, ensuring that the axial position, elevation, and arch rib deformation of the closure sections on both banks remain consistent. At this point, the section is installed in place.

[0051] S3. During the closure of the arch top of the steel pipe arch rib, the arch ribs on both sides are locked instantly by the pipe closure connection device. Bolt holes are drilled on the stiffening plates 16 on both sides. Bolt holes are drilled on one side of the connecting ear plate 17. The connecting ear plate 17 on the side with the drilled hole is aligned with the bolt 17 on the stiffening plate 16 of the pipe 15 and bolted. After the forced closure measures are taken to correct the horizontal and vertical alignment error, the connecting ear plate 17 on the side without the drilled hole is aligned with the bolt hole on the stiffening plate 16 of the pipe 15. The bolt hole is drilled on the connecting ear plate 17 on site. The bolt 18 is tightened by a torque wrench to complete the bolting.

[0052] S4. Select a suitable temperature and weld the code plate on the outside of the main chord tube 1 to fix the closure joint;

[0053] S5. Measure the actual dimensions of the closure joint and determine the cutting position of the upper and lower chord pipe fitting sections. Use the main chord pipe 1 closure connection device to connect the upper and lower chord pipes, fully weld and fix the reinforcing plate 14 to the inner wall of the main chord pipe 1, install the connecting plate 2 and the internal threaded sleeve 3, and install the connecting components between the internal threaded sleeves 3. Through the mutual cooperation of the convex ring 6, wear-resistant ring 8, limiting ring 7, retaining ring 9 and screw 10, the arch rib is quickly closed and connected.

[0054] S6. After welding the closure section of the main chord pipe 1 and the insert pipe, cut off the code plate outside the main chord pipe 1.

[0055] The implementation principle of the above-mentioned steel pipe arch bridge closure connection device is as follows: With the cooperation of the convex ring 6, wear-resistant ring 8, limiting ring 7, retaining ring 9 and screw 10, the distance between the two connecting columns 4 can be limited. The two connecting columns 4 can only rotate along their axis. A collar 11 is set to facilitate the rotation of the connecting column 4 by the staff through the collar 11. Both connecting columns 4 can rotate without affecting each other. The connecting column 4 can be threaded together with the internal threaded sleeve 3 to realize the rapid closure connection of the arch bridge. The stability after connection is strong. With the cooperation of the circular plate, connecting plate 2, screw and nut, the connecting plate 2 is installed on one side of the circular plate. The connecting plate 2 and the circular plate can be fixed through the threaded cooperation between the nut and the screw. After fixing, the connecting plate 2 is fully welded to the main chord tube 1 to further enhance the stability of the connecting plate 2. A reinforcing rod 12 is set to enhance the stability of the connection between the two connecting columns 4. A reinforcing plate 14 is set to enhance the strength of the main chord tube 1.

[0056] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A steel pipe arch bridge arch rib closure connection device, comprising a main chord pipe (1), a connecting pipe (15), a main chord pipe closure connection device for connecting two main chord pipes (1), and a connecting pipe closure connection device for connecting two connecting pipes (15), characterized in that: Two parallel main chord tubes (1) are fixedly connected by a connecting tube (15). A connecting plate (2) can be detachably installed inside both main chord tubes (1). The main chord tube (1) closure connection device includes an internal threaded sleeve (3) and a connecting component. An internal threaded sleeve (3) is fixedly connected to the side of the two connecting plates (2) that are close to each other. A connecting component is provided between the two internal threaded sleeves (3). The connecting component includes two connecting posts (4). An external thread (5) that matches the connecting post (4) is opened on the outer wall of the internal threaded sleeve (3). An integrally formed convex ring (6) is provided on the outer wall of the side of the two connecting posts (4) that are close to each other. A limiting ring (7) for limiting the convex ring (6) is detachably installed on the outside of the convex ring (6). A wear-resistant ring (8) is provided between the limiting ring (7) and the convex ring (6). A retaining ring (9) is provided on the side of the two convex rings (6) that are far apart from each other. A plurality of screws (10) are provided on the retaining ring (9) for fixing it to the limiting ring (7). A reinforcing rod (12) is horizontally arranged between the two connecting columns (4). A cavity (13) adapted to the reinforcing rod (12) is opened inside the connecting column (4). Multiple reinforcing plates (14) are arranged in a ring array and at equal intervals inside the main chord tube (1).

2. The steel pipe arch bridge arch rib closure connection device according to claim 1, characterized in that: A gap is provided between the retaining ring (9) and the convex ring (6), and a collar (11) fixedly sleeved on the outer wall of the connecting column (4) is provided between the retaining ring (9) and the internal threaded sleeve (3).

3. The steel pipe arch bridge arch rib closure connection device according to claim 1, characterized in that: The closure connection device of the duct (15) includes a stiffening plate (16) and a connecting ear plate (17). The stiffening plate (16) is installed on one side of the two ducts (15) near the closure section. Each stiffening plate (16) has multiple bolt holes. The two opposite stiffening plates (16) are connected by the connecting ear plate (17). The connecting ear plate (17) is provided with bolts (18), and the bolts (18) pass through the bolt holes.

4. The steel pipe arch bridge arch rib closure connection device according to claim 2, characterized in that: An inner cylinder (19) is fixedly installed on the collar (11). The inner cylinder (19) penetrates one side of the collar (11) and one end of the inner cylinder (19) extends into the interior of the connecting column (4). A pressure rod (21) is slidably installed inside the inner cylinder (19). An arc-shaped pressure plate (22) is fixedly installed at the bottom end of the pressure rod (21). An anti-slip pad (23) is fixedly installed at the bottom end of the arc-shaped pressure plate (22). An outer cylinder (19) is fixedly installed inside the connecting column (4). 25), the inner cylinder (19) is located inside the outer cylinder (25), a slider (27) is fixedly installed on the side wall of the pressure rod (21), one side of the slider (27) extends into the outer cylinder (25), a spring (26) is fixedly installed inside the outer cylinder (25), the slider (27) is elastically connected to the top wall of the outer cylinder (25) through the spring (26), and an adjustment component for adjusting the position of the pressure rod (21) is provided inside the inner cylinder (19).

5. The steel pipe arch bridge arch rib closure connection device according to claim 4, characterized in that: The adjustment assembly includes a connecting rod (29), a connecting pin (28), and an L-shaped seat (31). There are two connecting rods (29) arranged in an X-shape. The connecting pin (28) passes through the middle of the two connecting rods (29) and the connecting rods (29) are rotatably connected to the connecting pin (28). The two ends of the connecting pin (28) are rotatably connected to the cylinder wall of the inner cylinder (19). A pull rod (30) is rotatably installed at the bottom end of each of the two connecting rods (29). Four L-shaped seats (31) are fixedly installed at the top end of the pressure rod (21). The two ends of the pull rod (30) extend into the two L-shaped seats (31) on both sides respectively.

6. The steel pipe arch bridge arch rib closure connection device according to claim 5, characterized in that: An adjusting rod (20) is provided at the top of the inner cylinder (19). The bottom of the adjusting rod (20) extends into the inner cylinder (19), and the bottom of the adjusting rod (20) is threadedly connected to the inner cylinder (19). A handle (24) is fixedly installed at the top of the adjusting rod (20).

7. A construction method for a steel pipe arch bridge arch rib closure connection device according to any one of claims 1-6, characterized in that, Includes the following steps: S1. According to the design drawings of each component of the steel pipe arch bridge arch rib closure connection device, the steel structure processing plant will carry out mold matching, cutting and material preparation, and pre-closure will be carried out in the horizontal assembly area; S2. The closure section is lifted to the installation position using a cable crane, and real-time monitoring and measurement are carried out. The horizontal accuracy is adjusted by using tool ropes and the vertical accuracy is adjusted by using fastening ropes to ensure that the axial position, elevation and arch rib deformation of the closure section of the two arch ribs are consistent. At this time, the installation is in place. S3. During the closure of the arch top of the steel pipe arch rib, the arch ribs on both sides are locked instantly by the closure connection device of the pipe (15). Bolt holes are drilled on the stiffening plates (16) on both sides. Bolt holes are drilled on one side of the connecting ear plate (17). The connecting ear plate (17) on the side with the drilled hole is aligned with the bolt (18) of the stiffening plate (16) on the pipe (15) and bolted. After the forced closure measures are taken to correct the horizontal and vertical alignment error, the connecting ear plate (17) on the side without the drilled hole is aligned with the bolt hole of the stiffening plate (16) on the pipe (15). The bolt hole is drilled on the spot using the connecting ear plate (17). The bolt (18) is tightened by a torque wrench to complete the bolting. S4. Select a suitable temperature and weld a code plate on the outside of the main chord tube (1) to fix the closure joint; S5. Measure the actual dimensions of the closure joint, determine the cutting position of the upper and lower chord pipe fitting sections, use the main chord pipe (1) closure connection device to connect the upper and lower chord pipes, fully weld and fix the reinforcing plate (14) and the inner wall of the main chord pipe (1), install the connecting plate (2) and the internal thread sleeve (3), and install the connecting components between the internal thread sleeves (3). Through the mutual cooperation of the convex ring (6), wear-resistant ring (8), limit ring (7), retaining ring (9) and screw (10), the arch rib is quickly closed and connected. S6. After welding the main chord pipe (1) closure section of the insert pipe, cut off the code plate outside the main chord pipe (1).

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