Temporary external cable system setting method for steel pipe concrete arch rib during rotation or lifting construction

Abstract

The application provides a temporary external cable system setting method for a steel pipe concrete arch rib during rotation or lifting construction, wherein the temporary cable is arranged outside the horizontal projection of the steel pipe concrete arch rib through a mounting base, so that the temporary cable does not interfere with the low-position assembling support of the arch rib, and then during the early small-section assembling process of the arch rib, the low-position assembling support of the arch rib can avoid being designed in a separated mode, the construction safety is improved, the influence on the installation and positioning of the arch rib is reduced, and the early small-section assembling of the arch rib is facilitated; meanwhile, the internal force load received by the temporary cable during work can be transmitted to the arch rib through the mounting base, so that the stress received by the arch rib is dispersed, and the safety of the structure is improved.

Description

Technical Field

[0001] This invention relates to the field of steel-concrete composite arch bridge construction technology, and in particular to a method for setting up a temporary external cable system when rotating or lifting a steel-concrete composite arch rib. Background Technology

[0002] Concrete-filled steel tube arch bridges are a novel bridge type with excellent mechanical properties, and have gradually gained attention and favor in the engineering field in recent years. In terms of economy, concrete-filled steel tube arch bridges have high resistance to external forces, reducing the bridge's self-weight and thus alleviating costs. Regarding short construction periods, the use of prefabricated components and on-site assembly saves construction time, shortens the construction period, and improves project efficiency. In terms of superior mechanical properties, concrete-filled steel tube arch bridges possess good stiffness and seismic performance, enabling them to adapt to various complex bridge environments and load requirements, ensuring the safety and reliability of the bridge. With these advantages, the application frequency of concrete-filled steel tube arch bridges in transportation construction is increasing year by year.

[0003] In the construction of steel-concrete composite arch bridges in China, the integral structure lifting method is widely used due to its short construction period, mature technology, and complete construction equipment. To ensure the stability of the arch rib during the lifting process, temporary cables need to be installed at both ends of the lifting section to constrain the deformation trend of the arch rib during the lifting stage, forming a stable integral structure. The installation of temporary cables is a critical step in the construction, directly affecting the stability, safety, and construction accuracy of the arch rib lifting section, and is crucial for improving the overall bridge quality and construction efficiency.

[0004] In existing technologies, temporary cables are typically fixed at the hanger holes at the arch foot of the arch rib, which are used to install hangers. This utilizes the arch rib's own structure as an anchor point, reducing modifications to the rib structure. However, the use of hanger holes dictates that the temporary cables must pass directly beneath the arch rib, leading to excessive local stress on the hanger holes. Furthermore, during the construction of steel-concrete composite arch ribs, a low-level assembly support is usually erected first. The various segments of the steel-concrete composite arch rib are then assembled on this support before being lifted and rotated using hoisting equipment to complete the installation. Since the temporary cables must pass directly beneath the arch rib, interference occurs between the temporary cables and the low-level assembly support below the rib during lifting. To avoid the low-level assembly support obstructing the lifting or rotation of the arch rib, existing technologies often employ a split design to accommodate the temporary cables, resulting in poor support stability and high foundation bearing capacity requirements. However, if temporary connections are added between the split supports to enhance their stability, it will block the vertical displacement of the temporary cables, requiring additional disassembly work during the installation of the arch ribs, which increases the safety risks of construction. Summary of the Invention

[0005] To address the technical problems mentioned in the background art, this invention aims to provide a method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib. This method solves the problem that the existing conventional technology uses hanger holes as temporary cable anchor points, which easily leads to stress concentration in the hanger holes and makes it difficult to improve the structural safety factor. At the same time, the low-position assembly support of the arch rib needs to avoid the temporary cable in the spatial structure, which is not conducive to the early stage of small segment assembly of the arch rib.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib includes the following steps:

[0008] S1, Build a low-position assembly support for the arch rib, and assemble the arch rib segments on the low-position assembly support to obtain a steel-concrete composite arch rib.

[0009] S2, Install a temporary external cable system on the steel-concrete composite arch rib: The temporary external cable system includes two mounting seats and two temporary cables. The two mounting seats are respectively fixed to the opposite ends of the steel-concrete composite arch rib. The two temporary cables are respectively located on the opposite sides of the steel-concrete composite arch rib and are located outside the horizontal projection of the steel-concrete composite arch rib and the horizontal projection of the low-position assembly support of the arch rib. The two ends of each temporary cable are respectively connected to the two mounting seats.

[0010] S3. When the steel-concrete arch rib is rotated or lifted, the temporary cable is tensioned with jacks to form a horizontal constraint force, thereby controlling the shape and posture of the arch rib.

[0011] Furthermore, the mounting base includes two bases and a spreader beam. The two bases are respectively fixed to opposite sides of the steel-concrete arch rib along the transverse direction of the bridge. The spreader beam is parallel to the transverse direction of the bridge and is fixedly connected to the two bases. The opposite ends of the spreader beam extend to the opposite sides of the steel-concrete arch rib along the transverse direction of the bridge. One end of each of the two temporary cables is connected to the opposite ends of the spreader beam of one of the mounting bases, and the other end of each of the two temporary cables is connected to the opposite ends of the spreader beam of the other mounting base.

[0012] Furthermore, the base includes two support plates, two sets of ribs, and a fixing plate. The two support plates are spaced apart along the transverse direction of the bridge. The bottom of each support plate is fixedly connected to the steel-concrete arch rib. The two sets of ribs are respectively disposed on the two support plates and located on the side of the corresponding support plate facing away from the other support plate. Each rib is fixedly connected to the corresponding support plate and the steel-concrete arch rib. The fixing plate is fixedly connected to the top of the two sets of ribs and the two support plates. The spreader beam is fixedly connected to the fixing plate of the two bases.

[0013] Furthermore, the spreader beam includes two mounting plates, two web plates, and several partitions. The two mounting plates are arranged in parallel and spaced apart. One mounting plate is fixedly connected to the two bases. The two web plates are respectively located on opposite sides of the mounting plates, and each web plate is fixedly connected to the two mounting plates. The several partitions are arranged at intervals along the length of the mounting plates, and each partition plate is fixedly connected to the two mounting plates and the two web plates. The temporary cable is threaded and fixed to the two mounting plates.

[0014] Furthermore, the mounting plate is provided with mounting holes. The temporary cable is passed through the mounting holes on the two mounting plates. After the temporary cable is tensioned by a jack, the temporary cable is fixed to the mounting plate of the spreader beam by a re-tensioning anchor.

[0015] Furthermore, the spreader beam also includes an anchor plate, which is placed between the re-tensionable anchor and the mounting plate.

[0016] Furthermore, the two mounting plates and the two web plates form a cavity, and the partition is fixed in the cavity; the spreader beam also includes two pairs of reinforcing plate assemblies, the two pairs of reinforcing plate assemblies are respectively disposed at the two mounting holes, each pair of reinforcing plate assemblies is respectively disposed on opposite sides of the corresponding mounting hole, and the reinforcing plate assemblies are fixed in the cavity.

[0017] Furthermore, the reinforcing plate assembly includes a vertical plate and two horizontal plates. The vertical plate is parallel to the web plate, and the two mounting plates are fixedly connected to the opposite ends of the vertical plate. The two horizontal plates are respectively disposed on opposite sides of the vertical plate, and each horizontal plate is vertically connected to the vertical plate and the mounting plate on the corresponding side.

[0018] Furthermore, the steel-concrete composite arch rib includes two oppositely arranged upper chords, two oppositely arranged lower chords, an upper connecting rod connecting the two upper chords, a lower connecting rod connecting the two lower chords, and a web member connecting the upper chords and the lower chords. The two mounting seats are respectively connected to the two lower chords and are located at the junction of the corresponding lower chord, the lower connecting rod and the web member.

[0019] By adopting the above technical solution, the present invention has the following beneficial effects:

[0020] Compared to conventional techniques that use hanger holes as temporary cable anchor points, the aforementioned method for setting up a temporary external cable system during the rotation or lifting of the steel-concrete composite arch rib utilizes mounting seats to position the temporary cables outside the horizontal projection of the arch rib. This prevents interference with the low-level assembly support of the arch rib, thus avoiding the need for a separate design for the low-level assembly support during the early stages of arch rib segment assembly. This improves construction safety and reduces the impact on arch rib installation and positioning, facilitating the early stages of arch rib segment assembly. Simultaneously, the internal loads experienced by the temporary cables during operation can be transferred to the arch rib through the mounting seats, dispersing the stress on the arch rib and enhancing structural safety. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure after the temporary cables have been installed, according to a preferred embodiment of the present invention, for the construction of a temporary external cable system for rotating or lifting a steel-concrete composite arch rib.

[0022] Figure 2 for Figure 1 Partial structural diagram of the location where the mounting base is located;

[0023] Figure 3 for Figure 2 A top view of part of the structure;

[0024] Figure 4 for Figure 2 Enlarged view of some of the structures;

[0025] Figure 5 for Figure 4 A cross-sectional view of the lower chord after removing the spreader beam and temporary cable;

[0026] Figure 6 This is a schematic diagram of the structure of the spreader beam in a preferred embodiment of the present invention;

[0027] Figure 7 for Figure 6 Schematic diagram of the right-side structure after removing the re-tensionable anchor;

[0028] Explanation of main component symbols

[0029] 10. Low-position assembly support for arch rib; 11. Support; 20. Steel-concrete composite arch rib; 21. Upper chord; 23. Lower chord; 25. Upper gusset; 27. Lower gusset; 29. ​​Web member; 30. Temporary external cable system; 31. Mounting seat; 32. Base; 321. Support plate; 322. Rib plate; 323. Fixing plate; 34. Spreader beam; 341. Mounting plate; 342. Mounting hole; 343. Web plate; 345. Partition plate; 35. Reinforcing plate assembly; 351. Vertical plate; 353. Horizontal plate; 36. Anchor plate; 37. Temporary cable; 38. Re-tensionable anchor. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Please also see Figures 1 to 7 A preferred embodiment of the present invention provides a method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib, comprising the following steps:

[0034] S1. Construct the low-level arch rib assembly support 10, and assemble the arch rib segments on the low-level arch rib assembly support 10 to obtain the steel-concrete composite arch rib 20. In the prior art, the low-level arch rib assembly support is a split-type support, which consists of multiple sets of split-type supports along the length of the arch rib. Each set of split-type supports includes two supports spaced apart along the width of the arch rib, i.e., in the transverse direction. The two supports are respectively located on opposite sides of the temporary cable, and the two supports are not connected to each other to form a clearance space for the temporary cable (not shown in the figure). In this embodiment, the low-level arch rib assembly support 10 is an integral structure, that is, two sets of supports 11 are connected together, and there is no need to space between the two sets of supports 11 to form a clearance space for the temporary cable 37.

[0035] The structure of the steel-concrete composite arch rib 20 in this embodiment is existing technology. It typically includes two upper chords 21, two lower chords 23, several upper tie rods 25, several lower tie rods 27, and two sets of web members 29. The two upper chords 21 are arranged opposite each other in the transverse direction of the bridge, and the two lower chords 23 are arranged opposite each other in the transverse direction below the upper chords 21. Several upper tie rods 25 connect the two upper chords 21, and several lower tie rods 27 connect the two lower chords 23. The upper chords 21 and lower chords 23 on the same side are connected by web members 29.

[0036] S2, Install a temporary external cable system 30 on the steel-concrete arch rib 20: The temporary external cable system 30 includes two mounting seats 31 and two temporary cables 37. The two mounting seats 31 are respectively fixed to the opposite ends of the steel-concrete arch rib 20. The two temporary cables 37 are respectively located on the opposite sides of the steel-concrete arch rib 20 and are located outside the horizontal projection of the steel-concrete arch rib 20 and the horizontal projection of the low-position assembly bracket 10 of the arch rib. The two ends of each temporary cable 37 are respectively connected to the two mounting seats 31.

[0037] In this embodiment, two mounting bases 31 are respectively connected to two lower chord members 23 and located at the junctions of the corresponding lower chord members 23, lower tie members 27, and web members 29. Each mounting base 31 includes two bases 32 and a spreader beam 34. The two bases 32 are respectively fixed to opposite sides of the steel-concrete composite arch rib 20 along the transverse direction of the bridge. Specifically, the two bases 32 are respectively fixed at the junctions of the two lower chord members 23 of the steel-concrete composite arch rib 20 with the corresponding lower tie members 27 and web members 29. Each base 32 includes two support plates 321, two sets of ribs 322, and a fixing plate 323. The two support plates 321 are spaced apart along the transverse direction of the bridge. The bottom of each support plate 321 is fixedly connected to the lower chord 23 of the steel-concrete arch rib 20, and the side of each support plate 321 is fixedly connected to the web member 29. The two sets of ribs 322 are respectively provided on the two support plates 321 and are located on the side of the corresponding support plate 321 facing away from the other support plate 321. Each rib 322 is fixedly connected to the corresponding support plate 321 and the steel-concrete arch rib 20. Specifically, one set of ribs 322 is fixedly connected to the corresponding support plate 321 and the lower chord 23 of the steel-concrete arch rib 20, and the other set of ribs 322 is fixedly connected to the corresponding support plate 321 and the lower chord 23 and the lower tie rod 27 of the steel-concrete arch rib 20. The fixing plate 323 is fixedly connected to the top of the two sets of ribs 322 and the two support plates 321.

[0038] The spreader beam 34 is parallel to the transverse direction of the bridge and fixedly connected to the two bases 32. The opposite ends of the spreader beam 34 extend to the opposite sides of the steel-concrete composite arch rib 20 along the transverse direction of the bridge. In this embodiment, the spreader beam 34 is fixedly connected to the fixing plates 323 of the two bases 32. The spreader beam 34 includes two mounting plates 341, two web plates 343, and several partition plates 345. The two mounting plates 341 are arranged parallel and spaced apart. The two web plates 343 are respectively located on opposite sides of the mounting plates 341. Each web plate 343 is fixedly connected to the two mounting plates 341, thereby forming a cavity (not shown) around the two mounting plates 341 and the two web plates 343. One mounting plate 341 is fixedly connected to the fixing plate 323 of the two bases 32, and the mounting plate 341 is provided with mounting holes 342 for installing temporary cables 37. The partition 345 is fixed in the cavity. Several partitions 345 are spaced apart along the length of the mounting plate 341. Each partition 345 is fixedly connected to two mounting plates 341 and two web plates 343.

[0039] In this embodiment, the spreader beam 34 further includes two pairs of reinforcing plate assemblies 35. The two pairs of reinforcing plate assemblies 35 are respectively disposed at two mounting holes 342. Each pair of reinforcing plate assemblies 35 is disposed on opposite sides of the corresponding mounting hole 342, and the reinforcing plate assemblies 35 are fixed in the cavity. Each reinforcing plate assembly 35 includes a vertical plate 351 and two horizontal plates 353. The vertical plate 351 is parallel to the web plate 343, and the two mounting plates 341 are fixedly connected to opposite ends of the vertical plate 351. The two horizontal plates 353 are respectively disposed on opposite sides of the vertical plate 351, and each horizontal plate 353 is vertically connected to the vertical plate 351 and the mounting plate 341 on the corresponding side.

[0040] One end of each of the two temporary cables 37 is connected to the opposite ends of the spreader beam 34 of one of the mounting bases 31, and the other end of each of the two temporary cables 37 is connected to the opposite ends of the spreader beam 34 of the other mounting base 31. The temporary cables 37 are made of prestressed steel strand. In this embodiment, one end of each temporary cable 37 is threaded and fixed to the two mounting plates 341 of one of the mounting bases 31, and the other end of each temporary cable 37 is threaded and fixed to the two mounting plates 341 of the other mounting base 31. Specifically, the temporary cables 37 are threaded through the mounting holes 342 on the two mounting plates 341 of the spreader beam 34. After tensioning the temporary cables 37 with a jack, a re-tensioning anchor 38 is used to fix the temporary cables 37 to the mounting plates 341 of the spreader beam 34, forming a temporary restraint cable system. The structure of the re-tensioning anchor 38 is prior art and will not be described in detail here for brevity. In addition, in this embodiment, the spreader beam 34 also includes an anchor plate 36, which is placed between the re-tensionable anchor 38 and the mounting plate 341.

[0041] S3. When the steel-concrete composite arch rib 20 is rotated or lifted, temporary cables 37 are tensioned using jacks to create horizontal constraint force, thereby controlling the arch rib's shape and posture. In use, the temporary external cable system 30 generates internal force after tensioning, which is transmitted to the steel-concrete composite arch rib 20 via the spreader beam 34 and base 32, creating a longitudinal horizontal constraint within the arch rib. During rotation and lifting, the steel-concrete composite arch rib 20 will detach from the low-position assembly support 10. At this time, the temporary constraint cable system ensures that the longitudinal horizontal constraint of the arch rib is controllable and adjustable, maintaining the arch rib's construction line and ensuring the correct posture of the steel-concrete composite arch rib 20 in the next stage of construction.

[0042] Compared to conventional techniques that use hanger holes as anchor points for temporary cables 37, the aforementioned method for setting up a temporary external cable system during the rotation or lifting of the steel-concrete composite arch rib uses mounting base 31 to place the temporary cable 37 outside the horizontal projection of the steel-concrete composite arch rib 20, preventing it from interfering with the low-level assembly support 10 of the arch rib. This allows the low-level assembly support 10 of the arch rib to avoid a separate design during the early small-segment assembly process, improving construction safety and reducing the impact on the installation and positioning of the arch rib. At the same time, the internal force load on the temporary cable 37 during operation can be transferred to the arch rib through mounting base 31, dispersing the stress on the arch rib and improving the structural safety. Furthermore, in this embodiment, the mounting base 31 is set at the junction of the corresponding lower chord 23, lower tie rod 27 and web member 29, which can transfer the internal force load on the temporary cable 37 during operation to the lower chord 23, lower tie rod 27 and web member 29 of the arch rib through the mounting base 31, so that the stress on the arch rib is more dispersed, which is beneficial to the safety of the structure.

[0043] In this embodiment, each base 32 includes two support plates 321, two sets of ribs 322 and a fixing plate 323. The support plates 321 are the main force-bearing components, the ribs 322 are the secondary force-bearing components, and the ribs 322 provide stability support for the support plates 321. The fixing plate 323 serves as the contact surface between the base 32 and the spreader beam 34.

[0044] In this embodiment, the spreader beam 34 is a box girder structure assembled from two mounting plates 341 and two web plates 343, which is used to bear the load generated by the tensioning of the temporary external cable system 30. The mounting plate 341 is provided with an opening for the temporary external cable system 30 to pass through the box girder structure. Reinforcing plate assemblies 35 are arranged on both sides of the opening to enhance the local stability of the box girder structure. The temporary external cable system 30 is anchored to the spreader beam 34 by a re-tensionable anchor 38, and an anchor plate 36 is provided at the anchor point to enhance local stability.

[0045] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib, characterized in that, Includes the following steps: S1, Build a low-position assembly support for the arch rib, and assemble the arch rib segments on the low-position assembly support to obtain a steel-concrete composite arch rib. S2, Install a temporary external cable system on the steel-concrete composite arch rib: The temporary external cable system includes two mounting seats and two temporary cables. The two mounting seats are respectively fixed to the opposite ends of the steel-concrete composite arch rib. The two temporary cables are respectively located on the opposite sides of the steel-concrete composite arch rib and are located outside the horizontal projection of the steel-concrete composite arch rib and the horizontal projection of the low-position assembly support of the arch rib. The two ends of each temporary cable are respectively connected to the two mounting seats. S3. When the steel-concrete arch rib is rotated or lifted, the temporary cable is tensioned with jacks to form a horizontal constraint force, thereby controlling the shape and posture of the arch rib.

2. The method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib as described in claim 1, characterized in that, The mounting base includes two bases and a spreader beam. The two bases are respectively fixed to opposite sides of the steel-concrete arch rib along the transverse direction of the bridge. The spreader beam is parallel to the transverse direction of the bridge and is fixedly connected to the two bases. The opposite ends of the spreader beam extend to the opposite sides of the steel-concrete arch rib along the transverse direction of the bridge. One end of each of the two temporary cables is connected to the opposite ends of the spreader beam of one of the mounting bases, and the other end of each of the two temporary cables is connected to the opposite ends of the spreader beam of the other mounting base.

3. The method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib as described in claim 2, characterized in that... The base includes two support plates, two sets of ribs, and a fixing plate. The two support plates are spaced apart along the transverse direction of the bridge. The bottom of each support plate is fixedly connected to the steel-concrete arch rib. The two sets of ribs are respectively disposed on the two support plates and located on the side of the corresponding support plate facing away from the other support plate. Each rib is fixedly connected to the corresponding support plate and the steel-concrete arch rib. The fixing plate is fixedly connected to the top of the two sets of ribs and the two support plates. The spreader beam is fixedly connected to the fixing plate of the two bases.

4. The method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib as described in claim 2, characterized in that, The spreader beam includes two mounting plates, two web plates, and several partition plates. The two mounting plates are arranged in parallel and spaced apart. One mounting plate is fixedly connected to the two base plates. The two web plates are respectively located on opposite sides of the mounting plates, and each web plate is fixedly connected to the two mounting plates. The several partition plates are arranged at intervals along the length of the mounting plates, and each partition plate is fixedly connected to the two mounting plates and the two web plates. The temporary cable is threaded and fixed to the two mounting plates.

5. The method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib as described in claim 4, characterized in that... The mounting plate is provided with mounting holes. The temporary cable is passed through the mounting holes on the two mounting plates. After the temporary cable is tensioned by a jack, the temporary cable is fixed to the mounting plate of the spreader beam by a re-tensioning anchor.

6. The method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib as described in claim 5, characterized in that, The spreader beam also includes an anchor plate, which is placed between the re-tensionable anchor and the mounting plate.

7. The method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib as described in claim 5, characterized in that... The two mounting plates and the two web plates form a cavity, and the partition is fixed in the cavity; the spreader beam also includes two pairs of reinforcing plate assemblies, the two pairs of reinforcing plate assemblies are respectively disposed at the two mounting holes, each pair of reinforcing plate assemblies is disposed on opposite sides of the corresponding mounting hole, and the reinforcing plate assemblies are fixed in the cavity.

8. The method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib as described in claim 7, characterized in that, The reinforcing plate assembly includes a vertical plate and two horizontal plates. The vertical plate is parallel to the web plate, and the two mounting plates are fixedly connected to the opposite ends of the vertical plate. The two horizontal plates are respectively disposed on opposite sides of the vertical plate, and each horizontal plate is vertically connected to the vertical plate and the mounting plate on the corresponding side.

9. The method for setting up a temporary external cable system during the rotation or lifting construction of a steel-concrete composite arch rib as described in claim 1, characterized in that, The steel-concrete composite arch rib includes two oppositely arranged upper chords, two oppositely arranged lower chords, an upper connecting rod connecting the two upper chords, a lower connecting rod connecting the two lower chords, and a web member connecting the upper chords and the lower chords. The two mounting seats are respectively connected to the two lower chords and are located at the junction of the corresponding lower chord, the lower connecting rod and the web member.

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