Construction method of high rise-span ratio ultrahigh steel box main arch mid-span low-position assembly hydraulic synchronous lifting closure system

Abstract

The invention discloses a large rise-span ratio ultrahigh steel box main arch mid-span low-position assembly hydraulic synchronous lifting closure system construction method which comprises the following steps: step 1, construction preparation, step 2, construction of a support system, step 3, construction of a lifting system, step 4, assembly of arch ribs, step 5, installation of a sling system, and step 6, lifting operation. 7, closure operation; and 8, construction ending and inspection. The arch rib structure, the support and the lifting and sling system are organically combined, and rapid assembling and lifting of the arch rib are achieved; the hydraulic lifting technology accelerates the construction progress, manual errors are reduced, and the precision is improved; multiple safety measures ensure construction stability and reduce accident risks; the system adapts to a complex environment, flexible adjustment is achieved through low-position splicing, and the application range is widened; the stability of the arch rib is ensured through the combination of the lifting support and the sling, and the controllability of closure is enhanced through the temporary closure frame.

Description

Technical Field

[0001] The invention relates to a bridge engineering construction technology, in particular to a hydraulic synchronous lifting, assembly and closure process for a large-span steel box main arch bridge, aiming to improve construction efficiency and safety. Background Art

[0002] In modern bridge engineering, especially in the construction of long-span bridges, how to efficiently and safely assemble and lift the arch ribs has become an important factor affecting construction efficiency and safety. Due to their complex structures and difficult construction, long-span bridges usually require advanced construction technology and equipment to meet design requirements and construction standards. At present, the widely used bridge construction technologies mainly include suspension method, jacking method, assembly method and hydraulic lifting technology. However, each of these methods has certain limitations:

[0003] (1) The traditional suspension method requires a large number of temporary support systems to ensure the stability and safety of the structure during construction. This not only increases the complexity and cost of construction, but also requires a high degree of spatial flexibility in the layout of the construction site, limiting its application in densely populated urban areas. Therefore, the suspension method is not always the best choice in the construction of long-span bridges.

[0004] (2) The jacking method is widely used in long-span bridges, but due to its extremely high requirements for construction accuracy, safety hazards such as structural deformation or tilting are prone to occur during construction. Once problems occur, it often leads to construction delays and additional costs. In addition, the jacking method is relatively strict in terms of the construction environment requirements for bridges and is difficult to adapt to complex terrain changes.

[0005] (3) As a common bridge construction method, the assembly method has improved construction efficiency to a certain extent. However, in practical applications, the docking accuracy during the assembly process is always a difficult problem. Especially in large-span bridges, the assembly and connection of arch ribs require extremely high precision. Any slight error may affect the stability and safety of the structure, which brings considerable challenges to construction.

[0006] (4) Hydraulic lifting technology is gradually being used in bridge construction. It can provide powerful lifting capacity and precise control, but its application in actual engineering still faces some challenges. Existing hydraulic systems often require complex devices, which increases the complexity and cost of construction. Moreover, the stability and reliability of the hydraulic system directly affect the safety of the lifting operation, and hydraulic failure may lead to serious construction accidents.

[0007] (5) In the design of the sling system, although a variety of sling structures and connection methods have been proposed, in actual construction, how to effectively maintain the balance of the sling and ensure the uniform distribution of the load is still a technical problem. The existing sling system often lacks the necessary balance design during the lifting process, which may lead to unbalanced load conditions in the structure during construction, thus affecting the safety and stability of the overall construction.

[0008] In summary, although the current bridge construction technology has met the construction needs of long-span bridges to a certain extent, there are still many shortcomings in terms of construction efficiency, safety and economy. Therefore, in-depth research and innovation on the construction technology of long-span bridges, especially combining hydraulic lifting technology, cable system optimization and arch rib structure design, will provide new ideas and solutions for the development of future bridge engineering. Summary of the invention

[0009] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a construction method for a hydraulic synchronous lifting and closure system for low-position assembly of a mid-span of a super-high steel box main arch with a large rise-to-span ratio.

[0010] The hydraulic synchronous lifting and closure structure of the low-position assembly of the middle span of the super-high steel box main arch with large span ratio includes the following steps:

[0011] Step 1: Construction preparation:

[0012] Prepare construction materials and carry out site layout;

[0013] Step 2: Construction of the support system:

[0014] Arrange the arch foot assembly bracket on the top surface of the installed steel box girder to support the arch foot and arch rib;

[0015] The arch foot assembling brackets are connected through the arch foot cross brace to form an integral structure;

[0016] An intermediate assembly bracket is provided between the arch foot assembly brackets to support the middle arch rib during the assembly process;

[0017] Ensure the stability and accurate position of the intermediate assembly bracket for subsequent arch rib assembly;

[0018] Step 3: Improve the system construction:

[0019] Install the lifting bracket and ensure that its foot is connected to the bottom steel pipe pile;

[0020] Install a top plate on the top of the lifting bracket, and install a lifting jack on the top plate;

[0021] Built-in lifting anchor box in lifting bracket;

[0022] The lifting jack is connected with the lifting rope to ensure the up and down sliding of the lifting anchor box;

[0023] Step 4: Assembly of arch ribs:

[0024] Install the arch foot and arch ribs on the arch foot assembly bracket;

[0025] Carry out quality inspection to ensure that the assembly quality of arch feet and arch ribs meets the design requirements;

[0026] Install the middle arch rib on the middle assembly bracket;

[0027] Connect the two ends of the middle arch rib by tensioning steel strands;

[0028] Step 5: Installation of the sling system:

[0029] Install the balance beam on the lifting anchor box of the lifting bracket;

[0030] Install the balancing main cable and balancing sling to form a stable sling system;

[0031] Install connecting slings at the lower part of the balance beam, including the first section sling and the second section sling, and connect the lower ends of the slings to the ends of the middle section arch ribs;

[0032] Ensure that the connecting slings can effectively transfer the load of the middle arch rib to ensure the stability of the balance beam;

[0033] Step 6: Improve your work:

[0034] Start the lifting jack, which acts on the lifting anchor box and the middle arch rib at the same time to achieve synchronous lifting;

[0035] Monitor load changes during lifting to ensure safe operation;

[0036] Lift the middle arch rib to the designed height to ensure that it is positioned accurately and remains horizontal;

[0037] During the lifting process, regularly check the stability and safety of the sling system;

[0038] Step 7: Closing operation:

[0039] After lifting into place, remove the temporary fixing rods and prepare for the joint closing operation;

[0040] One end of the temporary closure frame is hinged to the arch foot assembly bracket through a hinge shaft, and the other end is connected to the extended first section sling, the second section sling and the anchor bolt;

[0041] Install adjustable pads on the top of the temporary closure frame to directly support the middle arch rib and the arch foot arch rib;

[0042] The middle arch rib and the arch foot arch rib are connected and fixed by a temporary closure frame;

[0043] Carry out joint closure operations to ensure the stability and safety of the structure during the closure process;

[0044] Step 8. Construction completion and inspection:

[0045] Carry out quality inspection on the completed arch ribs and their connections to ensure compliance with the design and relevant standards;

[0046] Tidy up the construction site and remove waste and debris generated during the construction process.

[0047] Furthermore, in step 2, the arch foot arch rib and the middle section arch rib form an arch rib structure.

[0048] Furthermore, in step 2, the support system includes an arch foot assembly support and an intermediate assembly support, the arch foot assembly support is connected as a whole by an arch foot cross brace, and the intermediate assembly support is connected as a whole by an arch frame cross brace.

[0049] Further, in step three, the lifting system has at least two parts, the lifting system includes a lifting bracket, the lifting bracket has a lifting bracket foot, the lower part of the lifting bracket foot is connected to a bottom steel pipe pile, the top of the bottom steel pipe pile has a distribution beam and a supporting plate, and the lower part of the bottom steel pipe pile is anchored by a cap;

[0050] The lifting bracket also has a built-in lifting anchor box. The top of the lifting bracket is provided with a top plate, and a lifting jack is installed on the top plate. The lifting jack drives the lifting anchor box to slide up and down through the lifting rope.

[0051] Furthermore, in step five, there are at least two sling systems, which include a balance beam installed on the lifting anchor box of the lifting bracket. The upper part of the balance beam has a balance sling and a balance main cable. The balance main cable is umbrella-shaped, and the middle part of the balance main cable is connected to the lifting cable. The lower part of the balance beam has a connecting sling.

[0052] Furthermore, in step five, the lower end of the connecting sling is connected to the end of the middle arch rib, the connecting sling transfers the load of the middle arch rib to the balance beam, and the balance beam transfers the load to the lifting anchor box.

[0053] Furthermore, in step seven, the closure system is installed on the inner end of the arch foot assembly bracket, and the closure system includes a temporary closure frame, the temporary closure frame has a temporary bottom support, the bottom of the temporary closure frame is movably installed on the arch foot assembly bracket by a temporary fixing rod, and the top of the temporary closure frame is hingedly installed on the arch foot assembly bracket by a hinge shaft.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] 1) The present invention organically combines the arch rib structure, the support system, the lifting system and the sling system, and can realize the rapid assembly and lifting of the arch rib.

[0056] 2) The application of hydraulic lifting technology not only speeds up the construction progress, but also effectively reduces the errors caused by manual operation and improves the overall construction accuracy.

[0057] 3) Multiple safety measures have been incorporated, including the secure installation of the lifting anchor box, the setting of the balancing slings and the design of the temporary closure frame. These designs can effectively disperse the load, ensure the stability of the structure during the construction process, and reduce the risk of construction accidents caused by unexpected situations.

[0058] 4) In complex terrain or urban environments, traditional construction methods are often restricted, but this system can adapt to various construction environments through low-level assembly. The flexible arrangement of the support system allows the construction to be adjusted according to site conditions, ensuring the smooth progress of the construction.

[0059] 5) The combination of lifting bracket and sling system can meet the construction requirements of different bridge structures to a large extent and broaden its application scope.

[0060] 6) During the arch rib assembly and lifting stage, the stability and accuracy of the arch rib are ensured by the synchronous operation of the connection of the tension steel strands and the lifting system.

[0061] 7) The temporary closure frame enhances the controllability during the closure process and ensures the accurate docking and connection of each component. This high degree of controllability provides a good foundation for subsequent closure operations.

[0062] 8) The low-position assembly and hydraulic lifting technology used in the construction process greatly reduced the impact of construction on the surrounding environment. At the same time, due to the optimized configuration and rational use of materials during the construction process, the waste of resources was reduced and a more environmentally friendly construction method was achieved. This feature not only helps to protect the ecological environment of the construction site, but also improves the public's acceptance of large-scale infrastructure construction projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0064] Figure 1 This is a schematic diagram of the support system installation;

[0065] Figure 2This is a schematic diagram of assembling the arch foot and arch ribs;

[0066] Figure 3 This is a schematic diagram of the middle section arch rib assembly;

[0067] Figure 4 This is a schematic diagram of the lifting system installation;

[0068] Figure 5 To enhance the cross-section of the system;

[0069] Figure 6 This is a schematic diagram of the installation of the sling system;

[0070] Figure 7 This is a schematic diagram of the lifting of the middle section arch rib;

[0071] Figure 8 This is the installation diagram of the closure system;

[0072] Fig. 9 This is a schematic diagram of the joint closure status.

[0073] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0074] In the figure: 1. Steel box girder; 2. Arch foot cross brace; 3. Arch foot arch rib; 4. Middle section arch rib; 5. Arch foot assembly bracket; 6. Arch frame cross brace; 7. Foot brace; 8. Middle assembly bracket; 9. Tension steel strands; 10. Cap; 11. Bottom steel pipe pile; 12. Distribution beam; 13. Support plate; 14. Lifting bracket; 15. Lifting bracket foot; 16. Lifting anchor box; 17. Lifting cable; 18. Connecting sling; 19. Balancing main cable; 20. Balancing beam; 21. Balancing sling; 22. Top plate; 23. Lifting jack; 24. Temporary bottom support; 25. Hinge shaft; 26. Adjustable pad; 27. Temporary joint frame; 28. Anchor bolt; 29. ​​First section sling; 30. Second section sling; 31. Temporary fixing rod. DETAILED DESCRIPTION

[0075] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0076] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0077] Example 1

[0078] See also Figure 1-9 As shown, in this embodiment, a hydraulic synchronous lifting and closure structure for low-position assembly of the middle span of a super-high steel box main arch with a large rise-to-span ratio is provided, including an arch rib structure, a support system, a lifting system, a sling system, and a closure system.

[0079] The arch rib structure comprises an arch foot arch rib 3 and a middle section arch rib 4.

[0080] The support system is arranged on the top surface of the installed steel box girder 1, including an arch foot assembly support 5 and an intermediate assembly support 8; the arch foot assembly support 5 is used to carry the arch foot and arch rib 3, and the arch foot assembly support 5 is connected as a whole by the arch foot cross brace 2; the intermediate assembly support 8 is used to carry the middle section arch rib 4 during the assembly process, and the intermediate assembly support 8 is connected as a whole by the arch frame cross brace 6.

[0081] The lifting system has at least two parts, and the lifting system includes a lifting bracket 14, the lifting bracket 14 has a lifting bracket foot 15, the lower part of the lifting bracket foot 15 is connected to the bottom steel pipe pile 11, the top of the bottom steel pipe pile 11 has a distribution beam 12 and a supporting plate 13, and the lower part of the bottom steel pipe pile 11 is anchored by a base 10; the lifting bracket 14 has a built-in lifting anchor box 16, the top of the lifting bracket 14 has a top plate 22, and a lifting jack 23 is installed on the top plate 22, and the lifting jack 23 drives the lifting anchor box 16 to slide up and down through the lifting rope 17.

[0082] The sling system has at least two, and the sling system includes a balance beam 20, and the balance beam 20 is installed on the lifting anchor box 16 of the lifting bracket 14. The upper part of the balance beam 20 has a balance sling 21 and a balance main rope 19, and the balance main rope 19 is umbrella-shaped. The middle part of the balance main rope 19 is connected to the lifting rope 17, and the lower part of the balance beam 20 has a connecting sling 18, and the connecting sling 18 includes a first section sling 29 and a second section sling 30. The lower end of the connecting sling 18 is connected to the end of the middle section arch rib 4, and the connecting sling 18 transfers the load of the middle section arch rib 4 to the balance beam 20, and the balance beam 20 transfers the load to the lifting anchor box 16; at the same time, because the two ends of the balance beam 20 extend out of the lifting bracket 14, the function of the balance main rope 19 and the balance sling 21 is to ensure the balance and stability of the balance beam 20.

[0083] The closure system is installed at the inner end of the arch foot assembly bracket 5, including a temporary closure frame 27. The temporary closure frame 27 has a temporary bottom support 24. The bottom of the temporary closure frame 27 is movably mounted on the arch foot assembly bracket 5 by a temporary fixing rod 31, and the top of the temporary closure frame 27 is hingedly mounted on the arch foot assembly bracket 5 by a hinge shaft 25.

[0084] During the arch rib assembly stage, the arch foot assembly bracket 5 is used to support the arch foot arch rib 3, and the middle assembly bracket 8 is used to support the middle section arch rib 4 during the assembly process. The middle assembly bracket 8 is limited by the foot support 7, and the two ends of the middle section arch rib 4 are connected by the tensioning steel strands 9, and the lifting system is installed simultaneously.

[0085] After the arch ribs are assembled, the lifting system and the sling system are connected to both ends of the middle arch rib 4.

[0086] During the lifting stage of the middle arch rib 4, the lifting of the sling system, the lifting anchor box 16, the lifting rope 17 and the middle arch rib 4 are performed relatively synchronously.

[0087] When the middle section arch rib 4 is lifted into place and the middle section arch rib 4 and the arch foot arch rib 3 are connected, the temporary fixing rod 31 is removed, and one end of the temporary connection frame 27 is hingedly installed on the arch foot assembly bracket 5 by the hinge shaft 25, and the other end is connected by the extended first section sling 29, the second section sling 30 and the anchor bolt 28. The adjustable pad 26 is installed on the top of the temporary connection frame 27. The adjustable pad 26 directly supports the middle section arch rib 4 and the arch foot arch rib 3. Based on the above structure, the temporary connection frame 27 connects and fixes the middle section arch rib 4 and the arch foot arch rib 3, and the connection operation of the middle section arch rib 4 and the arch foot arch rib 3 is carried out under its fixation.

[0088] Example 2

[0089] Based on the same concept, this embodiment provides a construction method for a large span-ratio super-high steel box main arch mid-span low-position assembly hydraulic synchronous lifting joint structure, including the following steps:

[0090] Step 1: Construction Preparation

[0091] S11. Material preparation: Purchase the required structural materials, including arch ribs, brackets, lifting equipment, slings and connectors, and conduct material inspection and acceptance;

[0092] S12. Construction site layout: Build temporary facilities at the construction site, ensure the safety and smooth flow of the construction area, and set up appropriate safety warning signs.

[0093] Step 2: Construction of the support system

[0094] S21. Installation of arch foot assembly bracket 5:

[0095] On the top surface of the installed steel box girder 1, an arch foot assembly bracket 5 is arranged to support the arch foot arch rib 3;

[0096] The arch foot assembling brackets 5 are connected by the arch foot cross brace 2 to form an integral structure to ensure its stability.

[0097] S22, installation of the middle assembly bracket 8:

[0098] An intermediate assembly bracket 8 is provided between the arch foot assembly brackets 5 to support the middle arch rib 4 during the assembly process;

[0099] Ensure the stability and accurate position of the intermediate assembly bracket 8 to facilitate the subsequent arch rib assembly.

[0100] Step 3: Improve the system construction

[0101] S31, installation of lifting bracket 14:

[0102] Install the lifting bracket 14, ensuring that its foot is connected to the bottom steel pipe pile 11;

[0103] A top plate 22 is installed on the top of the lifting bracket 14 , and a lifting jack 23 is installed on the top plate 22 .

[0104] S32, setting of lifting anchor box 16:

[0105] A lifting anchor box 16 is built into the lifting bracket 14 to ensure that the anchor box is firmly connected to the bracket;

[0106] The lifting jack 23 is connected with the lifting rope 17 to ensure the upward and downward sliding of the lifting anchor box 16.

[0107] Step 4: Assembly of arch ribs

[0108] S41, Assembly of arch foot and arch rib 3:

[0109] Install the arch foot arch rib 3 on the arch foot assembly bracket 5 to ensure that they are accurately docked and stable;

[0110] Carry out necessary quality inspections to ensure that the assembly quality of the arch foot and arch rib 3 meets the design requirements.

[0111] S42, assembly of middle arch rib 4:

[0112] Install the middle arch rib 4 on the middle assembly bracket 8 to ensure its stability and accuracy;

[0113] The two ends of the middle arch rib 4 are connected by the tensioning steel strands 9 to ensure the overall stability of the arch rib.

[0114] Step 5: Installation of the sling system

[0115] S51, installation of balance beam 20:

[0116] A balance beam 20 is installed on the lifting anchor box 16 of the lifting bracket 14 to ensure its balance;

[0117] The balancing main rope 19 and the balancing sling 21 are installed to form a stable sling system.

[0118] S52, setting of connecting sling 18:

[0119] A connecting sling 18 is installed at the lower part of the balance beam 20, including a first section sling 29 and a second section sling 30, and their lower ends are connected to the end of the middle section arch rib 4;

[0120] It is ensured that the connecting slings 18 can effectively transfer the load of the middle arch rib 4 to ensure the stability of the balance beam 20 .

[0121] Step 6: Improve your work

[0122] S61. Start-up of the promotion system:

[0123] Start the lifting jack 23, and the lifting system should act on the lifting anchor box 16 and the middle arch rib 4 at the same time to achieve synchronous lifting;

[0124] Monitor load changes during lifting to ensure safe operation.

[0125] S62, lift to set height:

[0126] Lift the middle arch rib 4 to the designed height to ensure that it is positioned accurately and remains horizontal;

[0127] During the lifting process, regularly check the stability and safety of the sling system.

[0128] Step 7: Closing operation

[0129] S71, dismantling the temporary fixing rod 31:

[0130] After lifting to the right position, the temporary fixing rod 31 is removed to prepare for the joint closing operation.

[0131] S72, installation of temporary closure frame 27:

[0132] One end of the temporary closure frame 27 is hingedly mounted on the arch foot assembly bracket 5 through the hinge shaft 25, and the other end is connected to the extended first section sling 29, the second section sling 30 and the anchor bolt 28;

[0133] An adjustable pad 26 is installed on the top of the temporary joint frame 27 to directly support the middle section arch rib 4 and the arch foot arch rib 3.

[0134] S73, closure operation execution:

[0135] The middle arch rib 4 and the arch foot arch rib 3 are connected and fixed by a temporary joint frame 27;

[0136] Carry out joint closing operations to ensure the stability and safety of the structure during the joint closing process.

[0137] Step 8: Construction completion and inspection

[0138] S81. Quality inspection: Conduct quality inspection on the completed arch ribs and their connections to ensure compliance with the design and relevant standards;

[0139] S82. Construction site cleaning: Tidy up the construction site and remove waste and debris generated during the construction process.

[0140] Example 3

[0141] The large span ratio super-high steel box main arch mid-span low-position assembly hydraulic synchronous lifting joint structure is constructed by the large span ratio super-high steel box main arch mid-span low-position assembly hydraulic synchronous lifting joint system construction method.

[0142] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0143] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0144] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0145] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A construction method for a hydraulic synchronous lifting and closure system for a large span-ratio super-high steel box main arch mid-span low-position assembly, characterized in that: The steps include: Step 1: Construction preparation: Prepare construction materials and carry out site layout; Step 2: Construction of the support system: Arranging an arch foot assembly bracket (5) on the top surface of the installed steel box girder (1) to support the arch foot arch rib (3); The arch foot assembly brackets (5) are connected via the arch foot cross brace (2) to form an integral structure; An intermediate assembly bracket (8) is provided between the arch foot assembly brackets (5) to support the middle arch rib (4) during the assembly process; Ensure the stability and accurate position of the intermediate assembly bracket (8) to facilitate the subsequent arch rib assembly; Step 3: Improve the system construction: Install the lifting bracket (14) to ensure that its foot is connected to the bottom steel pipe pile (11); A top plate (22) is installed on the top of the lifting bracket (14), and a lifting jack (23) is installed on the top plate (22); A lifting anchor box (16) is built into the lifting bracket (14); The lifting jack (23) is connected to the lifting rope (17) to ensure the upward and downward sliding of the lifting anchor box (16); Step 4: Assembly of arch ribs: Installing the arch foot rib (3) on the arch foot assembly bracket (5); Perform quality inspection to ensure that the assembly quality of the arch foot and arch rib (3) meets the design requirements; Installing the middle arch rib (4) on the middle assembly bracket (8); Connecting two ends of the middle arch rib (4) by means of a tension steel strand (9); Step 5: Installation of the sling system: Installing a balance beam (20) on a lifting anchor box (16) of a lifting bracket (14); Installing a balancing main rope (19) and a balancing sling (21) to form a stable sling system; A connecting sling (18) is installed at the lower part of the balance beam (20), including a first section sling (29) and a second section sling (30), and the lower end of the sling (18) is connected to the end of the middle section arch rib (4); Ensure that the connecting sling (18) can effectively transfer the load of the middle arch rib (4) to ensure the stability of the balance beam (20); Step 6: Improve your work: The lifting jack (23) is started to act on the lifting anchor box (16) and the middle arch rib (4) at the same time during lifting, so as to achieve synchronous lifting; Monitor load changes during lifting to ensure safe operation; Lift the middle arch rib (4) to the designed height, ensuring that it is positioned accurately and remains horizontal; During the lifting process, regularly check the stability and safety of the sling system; Step 7: Closing operation: After lifting to the right position, the temporary fixing rod (31) is removed to prepare for the joint closing operation; One end of the temporary closure frame (27) is hinged to the arch foot assembly bracket (5) through a hinge shaft (25), and the other end is connected to the extended first section sling (29), the second section sling (30) and the anchor bolt (28); An adjustable pad (26) is installed on the top of the temporary joint frame (27) to directly support the middle section arch rib (4) and the arch foot arch rib (3); The middle arch rib (4) and the arch foot arch rib (3) are connected and fixed by a temporary joint frame (27); Carry out joint closure operations to ensure the stability and safety of the structure during the closure process; Step 8. Construction completion and inspection: Carry out quality inspection on the completed arch ribs and their connections to ensure compliance with the design and relevant standards; Tidy up the construction site and remove waste and debris generated during the construction process.

2. The construction method of the hydraulic synchronous lifting closure system for the low-position assembly of the middle span of the super-high steel box main arch with a large span-ratio according to claim 1 is characterized in that: In step 2, the arch foot arch rib (3) and the middle section arch rib (4) form an arch rib structure.

3. The construction method of the hydraulic synchronous lifting closure system for the low-position assembly of the middle span of the super-high steel box main arch with a large span-ratio according to claim 1 is characterized in that: In step 2, the support system comprises an arch foot assembly support (5) and an intermediate assembly support (8), wherein the arch foot assembly support (5) is connected as a whole by an arch foot cross brace (2), and the intermediate assembly support (8) is connected as a whole by an arch frame cross brace (6).

4. The construction method of the hydraulic synchronous lifting closure system for the low-position assembly of the middle span of the super-high steel box main arch with a large span-ratio according to claim 1 is characterized in that: In step 3, the lifting system has at least two parts, and the lifting system includes a lifting bracket (14), the lifting bracket (14) has a lifting bracket foot (15), the lower part of the lifting bracket foot (15) is connected to a bottom steel pipe pile (11), the top of the bottom steel pipe pile (11) has a distribution beam (12) and a supporting plate (13), and the lower part of the bottom steel pipe pile (11) is anchored by a cap (10); The lifting bracket (14) also has a built-in lifting anchor box (16). The top of the lifting bracket (14) has a top plate (22). A lifting jack (23) is installed on the top plate (22). The lifting jack (23) drives the lifting anchor box (16) to slide up and down through the lifting rope (17).

5. The construction method of the hydraulic synchronous lifting closure system for the low-position assembly of the middle span of the super-high steel box main arch with a large rise-span ratio according to claim 1 is characterized in that: In step five, there are at least two sling systems, and the sling system includes a balance beam (20). The balance beam (20) is installed on the lifting anchor box (16) of the lifting bracket (14). The upper part of the balance beam (20) has a balance sling (21) and a balance main rope (19). The balance main rope (19) is umbrella-shaped. The middle part of the balance main rope (19) is connected to the lifting rope (17). The lower part of the balance beam (20) has a connecting sling (18).

6. The construction method of the hydraulic synchronous lifting closure system for the low-position assembly of the middle span of the super-high steel box main arch with a large span-ratio according to claim 5 is characterized in that: In step five, the lower end of the connecting sling (18) is connected to the end of the middle arch rib (4), the connecting sling (18) transfers the load of the middle arch rib (4) to the balance beam (20), and the balance beam (20) transfers the load to the lifting anchor box (16).

7. The construction method of the hydraulic synchronous lifting closure system for the low-position assembly of the middle span of the super-high steel box main arch with a large span-ratio according to claim 1 is characterized in that: In step seven, the joint closure system is installed on the inner side end of the arch foot assembly bracket (5), and the joint closure system includes a temporary joint closure frame (27). The temporary joint closure frame (27) has a temporary bottom support (24). The bottom of the temporary joint closure frame (27) is movably installed on the arch foot assembly bracket (5) by a temporary fixing rod (31), and the top of the temporary joint closure frame (27) is hingedly installed on the arch foot assembly bracket (5) by a hinge shaft (25).

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