A bridge steel pipe arch rib segment flange welding composite connecting device and construction method

Abstract

This invention relates to the technical field of bridge and road engineering, and particularly to a welded composite connection device and construction method for flange segments of bridge steel pipe arch ribs. The device includes a pre-connection mechanism, a flange portion, a first steel pipe, and a second steel pipe. The flange portion includes flange part one and flange part two, respectively welded to the outer walls of the ends of the first and second steel pipes. A pair of fixing plates are bolted together between flange part one and flange part two. Several bolt holes are drilled through the fixing plates. The pre-connection mechanism includes a pair of clamping mechanisms that can be relatively unfolded or merged. The clamping mechanisms pre-fix the pair of fixing plates to both sides of flange part one and flange part two, with the bolt holes aligned. Flange part one and flange part two have the same structure. Flange part one includes a pair of wing plates distributed along the outer periphery of the first steel pipe. This invention achieves pre-fixed installation and automatic alignment of bolt holes, freeing up hands, saving time and effort, and improving construction efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of bridge and road engineering, and in particular to a welding composite connection device and construction method for flange segments of steel pipe arch ribs in bridges. Background Technology

[0002] With the rapid development of bridge construction technology in my country, steel-concrete composite arch bridges have become one of the mainstream bridge types for long-span bridges. Currently, the main arch ribs of long-span steel-concrete composite arch bridges are usually constructed by prefabrication in factory segments and hoisting and docking on site. The connection quality between the arch rib segments determines the structural safety and service life of the entire bridge.

[0003] The existing patent publication number CN115233532A discloses a steel pipe outer flange joint, a steel pipe arch rib and its connection method and joint design method. This technology realizes the bolt-then-weld operation mode by welding an outer flange with a notch groove to the outer wall of the end of the steel pipe.

[0004] However, in the above technical solution, the installation of the connecting plate requires the cooperation of at least two workers. One person holds up the connecting plate and aligns it with 8-16 screw holes one by one, while the other person inserts the bolts. It is difficult for a single person to complete the task independently, and only one side of the connecting plate can be aligned at a time. This method is not only labor-intensive and inefficient, but also prone to problems such as misalignment of screw holes and poor fit of the connecting plate during the positioning process. If the plate is accidentally dropped, it will threaten the safety of personnel and equipment below.

[0005] Therefore, it is necessary to provide a welding composite connection device and construction method for bridge steel pipe arch rib segment flanges to solve the problems mentioned in the background art. Summary of the Invention

[0006] The purpose of this invention is to provide a welding composite connection device and construction method for flange segments of bridge steel pipe arch ribs, which realizes pre-fixed installation and automatic alignment of bolt holes, freeing up hands, saving time and effort, and improving construction efficiency.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a welding composite connection device for a bridge steel pipe arch rib segment flange, comprising a pre-connection mechanism, a flange part, a first steel pipe and a second steel pipe; The flange portion includes flange part one and flange part two, which are respectively welded to the outer walls of the ends of the first steel pipe and the second steel pipe; A pair of fixing plates are fixed between flange one and flange two by bolts; Several screw holes are provided through the fixing plate; The pre-connection mechanism includes a pair of clamping mechanisms that can be deployed or merged relative to each other; A pair of clamping mechanisms pre-fix a pair of fixing plates to both sides of flange part one and flange part two, with the screw holes aligned with each other.

[0008] As a preferred embodiment of the present invention, flange one and flange two have the same structure; The flange includes a pair of flanges distributed along the outer periphery of the first steel pipe, and a sector plate disposed between the pair of flanges; The wing plate has several screw holes that are adapted to the fixing plate.

[0009] As a preferred embodiment of the present invention, the clamping mechanism includes side wing clamps; A pair of side wing plates have an arc-shaped guide beam that slides through and is fitted to the top of them; The arc-shaped guide beam is coaxially arranged with the first steel pipe.

[0010] As a preferred embodiment of the present invention, an extension cross plate is fixed to the inner side of the side wing clamp; The side wing clamps and the extended cross plate form a T-shaped structure; At least one pair of positioning rods are fixedly connected to the inner side of the extension plate; A pair of positioning rods are respectively set at the screw hole positions of the flange plates of flange one and flange two.

[0011] As a preferred embodiment of the present invention, a central seat is fixedly connected to the middle of the arc-shaped guide beam; The top of the central seat is provided with a liftable drive seat, and a guide locking part is provided between the two. The two ends of the side wing clamp are rotatably connected to hinge end one, and the two ends of the drive seat are rotatably connected to hinge end two. A hinge rod is provided between hinge end one and hinge end two.

[0012] As a preferred embodiment of the present invention, the guide locking part includes a guide rod and a bolt top rod; The top of the guide rod is fixedly connected to a limiting end, and the bottom is fixed to the center seat; The guide rod passes through the drive seat and slides with it; The bolt top rod is inserted through the side end of the drive seat and threadedly connected to it.

[0013] As a preferred embodiment of the present invention, a spring is sleeved on the outer side of the guide rod; The two ends of the spring are located between the drive seat and the center seat.

[0014] In a preferred embodiment of the present invention, the guide locking part includes a screw, and a handwheel is fixedly connected to the top of the screw; The screw passes through the drive seat and is threadedly connected to it; The bottom of the screw is rotatably connected to the center seat.

[0015] As a preferred embodiment of the present invention, a concave card seat is provided at the bottom of the central seat; The concave mounting bracket is used to engage with the outer side of the adjacent sector plates of flange one and flange two.

[0016] This invention also provides a construction method for a bridge steel pipe arch rib segment flange, which uses a welding composite connection device for a bridge steel pipe arch rib segment flange as described above, including the following steps: The first steel pipe with flange 1 welded on it and the second steel pipe with flange 2 welded on it are hoisted and aligned so that the mating surfaces of flange 1 and flange 2 fit tightly together. Place a pair of fixing plates on both sides of flange one and flange two respectively; Unfold a pair of clamping mechanisms of the pre-connection mechanism so that the pair of clamping mechanisms simultaneously fix the relative positions of flange part one, flange part two and a pair of fixing plates; Tighten the pre-connection mechanism to complete the pre-fixation of a pair of fixing plates on flange one and flange two. At this time, the screw holes on the fixing plates are aligned with the screw holes on flange one and flange two. All connecting bolts are installed and tightened manually in sequence. Unlock the pre-connection mechanism, unfold and remove a pair of clamping mechanisms to complete the connection operation of the arch rib segment flange.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention is equipped with a pre-connection mechanism, which can simultaneously complete the pre-fixation of the two side fixing plates and the alignment of all screw holes in one operation through the clamping mechanism, freeing up both hands. Only bolt installation is required, making the operation simple and convenient, and can be completed by a single person. This avoids the risk of falling due to instability caused by single-handed operation, and further improves construction efficiency and safety. Attached Figure Description

[0018] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0019] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the welding composite connection device of the present invention; Figure 2 yes Figure 1 A magnified view of a portion of region A; Figure 3 This is a three-dimensional schematic diagram of the pre-connection mechanism of the present invention; Figure 4This is a schematic cross-sectional view of the pre-connection mechanism of the present invention; In the diagram: 1. Pre-connection mechanism; 101. Side wing clamp; 102. Arc-shaped guide beam; 103. Extension cross plate; 104. Positioning rod; 105. Center seat; 106. Drive seat; 107. Screw; 108. Handwheel; 109. Concave card seat; 2. Hinge end one; 201. Hinge end two; 202. Hinge rod; 3. Fixing plate; 4. Flange part one; 401. Wing plate; 402. Sector plate; 5. Flange part two; 6. First steel pipe; 7. Second steel pipe. Detailed Implementation

[0020] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0021] Please see Figure 1-4 The present invention provides a technical solution: a welding composite connection device for a bridge steel pipe arch rib segment flange, comprising a pre-connection mechanism 1, a flange part, a first steel pipe 6, and a second steel pipe 7; The flange section includes flange part 4 and flange part 5, which are respectively welded to the outer walls of the ends of the first steel pipe 6 and the second steel pipe 7. A pair of fixing plates 3 are bolted between flange 4 and flange 5; The fixing plate 3 has several screw holes through it; The pre-connection mechanism 1 includes a pair of clamping mechanisms that can be deployed or merged relative to each other; A pair of clamping mechanisms pre-fix a pair of fixing plates 3 to both sides of flange part 1 4 and flange part 2 5, with the screw holes aligned with each other.

[0022] This embodiment also provides a construction method for bridge steel pipe arch rib segment flanges, which uses the above-mentioned welded composite connection device for bridge steel pipe arch rib segment flanges, including the following steps: Hoist and align the first steel pipe 6 with flange 4 welded on and the second steel pipe 7 with flange 5 welded on, ensuring a tight fit between the mating surfaces of flange 4 and flange 5. Place a pair of fixing plates 3 on both sides of flange 4 and flange 5 respectively. Unfold the pair of clamping mechanisms of the pre-connection mechanism 1, simultaneously fixing the relative positions of flange 4, flange 5, and the pair of fixing plates 3. Lock the pre-connection mechanism 1 to pre-fix the pair of fixing plates 3 on flange 4 and flange 5, at which point the bolt holes on the fixing plates 3 are aligned with the bolt holes on flange 4 and flange 5. Manually install and tighten all connecting bolts in sequence. Unlock the pre-connection mechanism 1, unfold and remove the pair of clamping mechanisms to complete the connection operation of the arch rib segment flange.

[0023] In this embodiment, a pre-connection mechanism 1 is provided. The pre-fixation of the two fixing plates 3 and the alignment of all screw holes can be completed simultaneously in one operation through the clamping mechanism, freeing up both hands. Only bolt installation is required. The operation is simple and convenient and can be completed by one person. It avoids the risk of falling due to instability caused by single-handed operation and further improves construction efficiency and safety. Furthermore, a pre-connection mechanism 1 is set up to adapt to existing bridge projects that use external flange welding composite connection technology. No modification is required to the original flange structure or construction process, making it highly adaptable.

[0024] Based on the above embodiments, flange 4 and flange 5 have the same structure. Flange 4 includes a pair of flanges 401 distributed along the outer periphery of the first steel pipe 6, and a sector plate 402 disposed between the pair of flanges 401. Several screw holes adapted to the fixing plate 3 are provided through the wing plate 401.

[0025] Based on the above embodiments, the clamping mechanism includes a side wing clamping plate 101; A pair of side wing plates 101 have an arc-shaped guide beam 102 that runs through and slides on their tops; The arc-shaped guide beam 102 is coaxially arranged with the first steel pipe 6.

[0026] In this embodiment, the arc-shaped guide beam 102 is set coaxially with the steel pipe to ensure that the movement trajectory of the two side wing plates 101 is consistent with the curvature of the steel pipe, and to automatically align and fit the unfolding angle of a pair of wing plates 401, thereby improving accuracy. Furthermore, by adjusting the deployment angle of the side wing clamp 101, the wing plate 401 with various deployment angles can be pre-positioned, improving the versatility of the device and saving costs. Preferably, the arc-shaped guide beam 102 is made of aluminum alloy to ensure that the device is lightweight. It has a rectangular cross-section, a hard anodized surface, and a radius of curvature that is consistent with the outer diameter of the first steel pipe 6 and the second steel pipe 7. Preferably, a rectangular sliding hole matching the cross-section of the arc-shaped guide beam 102 is provided on the top of the side wing clamping plate 101, and the fit clearance between the two is 0.1-0.2mm to ensure smooth sliding without jamming; Preferably, the surface of the arc-shaped guide beam 102 is provided with millimeter-level scale lines, and the side wing clamps 101 are provided with indicator arrows, which can quickly adjust the spacing between the two side wing clamps 101 according to the flange width, thereby improving installation efficiency.

[0027] Based on the above embodiment, an extension cross plate 103 is fixed to the inner side of the side wing clamp 101; The side wing clamp 101 and the extension cross plate 103 form a T-shaped structure; At least one pair of positioning rods 104 are fixedly connected to the inner side of the extension plate 103; A pair of positioning rods 104 are respectively set at the screw hole positions of the flange plate 401 of flange part 1 4 and flange part 2 5.

[0028] Specifically, firstly, a pair of fixing plates 3 are hung on the positioning rods 104 of the corresponding side extension plate 103 through screw holes, so that the fixing plates 3 are in contact with the inner side of the extension plate 103; then, the two side wing clamps 101 are adjusted along the arc-shaped guide beam 102 so that the positioning rods 104 are aligned with the corresponding screw holes on the wing plates 401 of flange part 1 4 and flange part 2 5, until the positioning rods 104 are inserted into the screw holes of the wing plates 401. Under the clamping action of the extension plate 103, the fixing plates 3 are in contact with the wing plates 401, and the pre-fixing is completed. In this embodiment, a positioning rod 104 is provided, which simplifies the previously difficult operation of simultaneously aligning the two layers of the fixing plate 3 and the wing plate 401 and multiple screw holes to first fixing the screw hole position of the fixing plate 3, and then aligning the two reference screw holes on the wing plate 401. Since the position of at least two screw holes has been aligned, the position of the remaining screw holes is automatically aligned, which reduces the difficulty of operation and improves construction efficiency. Furthermore, a positioning rod 104 is set to achieve simultaneous alignment of all screw holes, ensuring good coaxiality of the screw holes and avoiding errors caused by manual alignment by the naked eye. This allows subsequent bolts to be accurately inserted, resulting in high positioning accuracy. Preferably, the length of the horizontal plate 103 is extended to at least cover the distance between the screw holes on the flange 4 and flange 5, so that a pair of positioning rods 104 can be simultaneously inserted into the screw holes on both sides, ensuring that the fixing plate 3 and the flange 401 are horizontally aligned. Preferably, the diameter of the positioning rod 104 is 0.1-0.2 mm smaller than the nominal diameter of the screw hole to achieve a clearance fit, and the overall length is 35-45 mm, which is greater than the sum of the thickness of the fixing plate 3 and the thickness of the wing plate 401; and the end is machined with a rounded chamfer to facilitate insertion into the screw hole.

[0029] Based on the above embodiments, a center seat 105 is fixedly connected to the middle of the arc-shaped guide beam 102; The top of the center seat 105 is provided with a liftable drive seat 106, and a guide locking part is provided between the two. The two ends of the side wing clamp 101 are rotatably connected to hinge end 2, and the two ends of the drive seat 106 are rotatably connected to hinge end 201. A hinge rod 202 is provided between hinge end 2 and hinge end 201.

[0030] Specifically, by lifting the drive seat 106 upward, the two side wing plates 101 are driven to slide inward and merge synchronously along the arc-shaped guide beam 102 via the hinge rod 202, so that the positioning rod 104 is aligned with the corresponding screw hole on the wing plate 401 until the positioning rod 104 is inserted into the screw hole of the wing plate 401, and the fixing plate 3 and the wing plate 401 are in contact with each other. At this time, the position of the drive seat 106 on the center seat 105 is fixed by the guide locking part, and the pre-fixing is completed. In this embodiment, by controlling the lifting and lowering of the drive seat 106, the hinge rod 202 is pulled, which drives the double side wing clamps 101 to open and close synchronously. The operation is simple and convenient, and the efficiency is further improved. Furthermore, a hinge linkage mechanism is set up, and all moving parts use stainless steel pins and self-lubricating copper bushings, eliminating the need for regular lubrication and improving structural reliability; Preferably, all hinge pins are made of cotter pins to prevent them from falling off due to vibration at height.

[0031] Based on the above embodiments, the guide locking part includes a guide rod and a bolt top rod; The top of the guide rod is fixedly connected to a limit end, and the bottom is fixed to the center seat 105; The guide rod passes through the drive seat 106 and slides with it; The bolt top rod is installed through the side end of the drive seat 106 and is threadedly connected to it.

[0032] Preferably, the guide rod is made of 45 steel with chrome plating, and the bottom is machined with external threads. It is tightened and fixed in the threaded hole of the center seat 105 for easy installation and disassembly. The top is welded with a circular limiting end to limit the maximum rising height of the drive seat 106. Preferably, the bolt top rod is threadedly connected to the threaded hole on the side of the drive seat 106. After tightening, the rod head end presses against the guide rod surface to achieve locking, and its outer end is welded with a knurled butterfly handle for easy manual operation.

[0033] Based on the above embodiment, a spring is sleeved on the outside of the guide rod; The two ends of the spring are located between the drive seat 106 and the center seat 105.

[0034] In this embodiment, a spring is provided to provide a continuous and stable clamping force. When the drive seat 106 is released, a pair of side wing clamps 101 automatically approach and clamp, eliminating the need for manual pressing of the drive, thus further improving the ease of operation. Even if the bolt top rod is accidentally loosened, the spring can still provide sufficient clamping force to maintain the position of the fixing plate 3, further improving stability and safety.

[0035] This embodiment provides another preferred guide locking part, including a screw 107, and a handwheel 108 is fixedly connected to the top of the screw 107; The screw 107 passes through the drive seat 106 and is threadedly connected to it; The bottom of the screw 107 is rotatably connected to the center seat 105.

[0036] In this embodiment, a screw 107 is provided. While transmitting power to drive the drive seat 106 to rise and fall, the threaded transmission has a self-locking characteristic, eliminating the need for an additional locking device. The structure is simple, highly practical, and the clamping force can be precisely controlled by rotating the handwheel 108, resulting in high adjustment accuracy. Preferably, the screw 107 is made of 45 steel with heat treatment and the bottom is machined with a smooth shaft section, which is interference-fitted with the deep groove ball bearing in the center seat 105 to achieve a rotating connection.

[0037] Based on the above embodiments, a concave card seat 109 is provided at the bottom of the center seat 105; The concave mounting bracket 109 is used to engage with the outer side of the adjacent sector plate 402 of flange part 1 4 and flange part 2 5.

[0038] In this embodiment, a concave card seat 109 is set to engage with the outer side of the adjacent fan-shaped plate 402 of flange part 1 4 and flange part 2 5, thereby initially determining the overall position of the device, so that the arc-shaped guide beam 102 is coaxially set with the first steel pipe 6, further reducing the positioning offset. Subsequently, only minor adjustments to the body position are needed so that the positioning rod 104 can be aligned and inserted, further improving the ease of operation. Furthermore, a concave bracket 109 is provided to be attached to the outside of the sector plate 402, thereby providing a support point for the overall device and facilitating the operation of rotating the handwheel 108; Preferably, a nitrile rubber pad is provided on the inner side of the concave card holder 109 to increase friction and prevent the device from sliding, while also avoiding scratching the anti-corrosion coating on the surface of the fan-shaped plate 402.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection, the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the meaning of the above terms in this application according to the specific circumstances.

[0040] The above provides a detailed description of the welding composite connection device and construction method for bridge steel pipe arch rib segment flanges provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A welded composite connection device for flange segments of bridge steel pipe arch ribs, characterized in that, It includes a pre-connection mechanism (1), a flange, a first steel pipe (6), and a second steel pipe (7); The flange portion includes flange part one (4) and flange part two (5) respectively welded to the outer wall of the end of the first steel pipe (6) and the second steel pipe (7); A pair of fixing plates (3) are fixed between flange part one (4) and flange part two (5) by bolts; The fixing plate (3) has several screw holes through it; The pre-connection mechanism (1) includes a pair of clamping mechanisms that can be deployed or merged relative to each other; A pair of clamping mechanisms pre-fix a pair of fixing plates (3) to both sides of flange part one (4) and flange part two (5), and the screw holes are aligned with each other.

2. The welding composite connection device for bridge steel pipe arch rib segment flanges according to claim 1, characterized in that, The flange component one (4) and flange component two (5) have the same structure; The flange (4) includes a pair of flanges (401) distributed along the outer periphery of the first steel pipe (6), and a sector plate (402) disposed between the pair of flanges (401). The wing plate (401) has several screw holes that are compatible with the fixing plate (3).

3. The welding composite connection device for bridge steel pipe arch rib segment flanges according to claim 2, characterized in that, The clamping mechanism includes a side wing clamp (101); A pair of side wing plates (101) have an arc-shaped guide beam (102) that runs through and slides on top of them. The arc-shaped guide beam (102) is coaxially arranged with the first steel pipe (6).

4. The welding composite connection device for bridge steel pipe arch rib segment flanges according to claim 3, characterized in that, An extension cross plate (103) is fixed to the inner side of the side wing clamp (101). The side wing clamp (101) and the extension cross plate (103) form a T-shaped structure; At least one pair of positioning rods (104) are fixedly connected to the inner side of the extension plate (103). A pair of positioning rods (104) are respectively positioned at the screw holes of the flange plates (401) of flange part one (4) and flange part two (5).

5. The welding composite connection device for bridge steel pipe arch rib segment flanges according to claim 3, characterized in that, The arc-shaped guide beam (102) is fixedly connected to a center seat (105) in the middle. The top of the center seat (105) is provided with a liftable drive seat (106), and a guide locking part is provided between the two. The two ends of the side wing clamp (101) are rotatably connected to hinge end one (2), and the two ends of the drive seat (106) are rotatably connected to hinge end two (201). A hinge rod (202) is provided between hinge end one (2) and hinge end two (201).

6. The welding composite connection device for bridge steel pipe arch rib segment flanges according to claim 5, characterized in that, The guide locking part includes a guide rod and a bolt top rod; The top of the guide rod is fixedly connected to a limiting end, and the bottom is fixed to the center seat (105); The guide rod passes through the drive seat (106) and slides with it; The bolt top rod is inserted through the side end of the drive seat (106) and threadedly connected to it.

7. The welding composite connection device for bridge steel pipe arch rib segment flanges according to claim 6, characterized in that, A spring is sleeved on the outside of the guide rod; The two ends of the spring are located between the drive seat (106) and the center seat (105).

8. The welding composite connection device for bridge steel pipe arch rib segment flanges according to claim 5, characterized in that, The guide locking part includes a screw (107), and a handwheel (108) is fixedly connected to the top of the screw (107). The screw (107) passes through the drive seat (106) and is threadedly connected to it; The bottom of the screw (107) is rotatably connected to the center seat (105).

9. The welding composite connection device for bridge steel pipe arch rib segment flanges according to claim 5, characterized in that, The bottom of the center seat (105) is provided with a concave card seat (109). The concave mounting bracket (109) is used to engage with the outer side of the adjacent sector plate (402) of flange one (4) and flange two (5).

10. A construction method for a bridge steel pipe arch rib segment flange, comprising a welded composite connection device for a bridge steel pipe arch rib segment flange as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Hoist and align the first steel pipe (6) with flange 1 (4) and the second steel pipe (7) with flange 2 (5) so that the mating surfaces of flange 1 (4) and flange 2 (5) fit tightly together. S2. Place a pair of fixing plates (3) on both sides of flange part one (4) and flange part two (5) respectively; S3. Unfold a pair of clamping mechanisms of the pre-connection mechanism (1) so that the pair of clamping mechanisms simultaneously fix the relative positions of flange part one (4), flange part two (5) and a pair of fixing plates (3); S4. Lock the pre-connection mechanism (1) to complete the pre-fixation of a pair of fixing plates (3) on flange part one (4) and flange part two (5). At this time, the screw holes on the fixing plate (3) are aligned with the screw holes on flange part one (4) and flange part two (5). S5. Manually install and tighten all connecting bolts in sequence; S6. Unlock the pre-connection mechanism (1), unfold and remove the next pair of clamping mechanisms to complete the connection operation of the arch rib segment flange.

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