A double limb large angle inclined arch rib cable-stayed bridge middle arch rib installation structure

Abstract

The utility model provides a kind of installation structure of double limb large angle inclined arch rib cable-stayed bridge middle arch rib, including arch rib assembling support, arch rib starting section, a pair of arch ribs, buckle tower, vertical cable one, vertical cable two and a pair of upper arch rib lifting system;The pair of arch ribs is split into a pair of upper arch ribs and a pair of lower arch ribs;The height of buckle tower is 1 / 2 of arch rib length;Vertical cable one is connected tower column and two lower arch ribs respectively;Vertical cable two is connected tower column and two upper arch ribs respectively;A pair of upper arch rib lifting system is set in the two sides of buckle tower and is used to lift a pair of upper arch ribs respectively;The lower arch rib is hinged with arch rib starting section, and the lower arch rib is in vertical cable one tension control vertical rotation;The upper arch rib is in vertical cable two tension control vertical rotation, and the bottom of upper arch rib and the top of lower arch rib are correspondingly matched when being in vertical rotation inclination and lifting state.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, specifically to an installation structure for the arch rib in a double-limb, large-angle inclined arch-rib cable-stayed bridge. Background Technology

[0002] In recent years, bridges have become an important part of the urban landscape, with diverse structural forms. The concept of "one bridge, one view" is considered an effective application of urban aesthetics in urban design. Double-limb, high-angle inclined arch-rib cable-stayed bridges, with their beautiful overall shape, are widely used as a preferred bridge type for cities. (Example: Double-limb, high-angle inclined arch-rib cable-stayed bridges...) Figure 1 The bridge shown is a composite bridge type that combines the characteristics of arch bridges and cable-stayed bridges. Its core feature is that the arch ribs 10 with large-angle inclination on both sides work together with the cable-stayed system to form a unique spatial structure system.

[0003] Double-limb inclined arch ribs: The two arch ribs 10 incline outward at a large angle and are connected by transverse bracing at the top or middle to form a stable spatial arch structure. This arrangement can significantly improve lateral stiffness and torsional resistance. Cable-stayed system: The arch ribs 10 serve as anchor supports for the cables 20, the other end of which is connected to the main beam 30, forming an "arch-cable-beam" combined load-bearing system. The cables 20 can share the horizontal thrust of the arch ribs 10, reducing the foundation load. The arch ribs 10 are primarily under compression, the cables 20 provide elastic support, and the main beam 30 bears bending moment and axial force. These three elements work together to optimize the load transfer path, forming a composite load-bearing mechanism.

[0004] The top of the double-limbed, large-angle inclined arch ribs has a large height difference from the water surface. In order to reduce the investment in support and hoisting equipment, a tower 40 with a height exceeding the design top elevation of the arch rib 10 is generally set between the two arch ribs 10. The construction method is to assemble horizontally and rotate vertically (the arch rib 10 is assembled horizontally and rotated vertically to form the shape).

[0005] The double limb arched rib 10 lying-up vertical rotation is divided into the following three stages:

[0006] (1) Arch Rib 10 Assembly Stage

[0007] Using the already constructed main beam 30 and arch rib mounting bracket 60 (the portion of the arch rib extending beyond the bridge deck) as the arch rib assembly platform, the arch rib segments are hoisted onto the assembly platform in sections using a floating crane or crane, and the inter-segment welding is completed to form arch rib 10 (e.g., Figure 2 As shown), a pair of arch ribs 10 are assembled on both sides of the arch rib assembly platform; an arch rib vertical hinge 11 is provided at the bottom of the arch rib 10 (as shown). Figure 5 (as shown);

[0008] (2) Vertical Turning Connection Stage

[0009] Align the vertical pivot hinge 11 of the arch rib 10 at the bottom of the arch rib with the starting section 70 of the arch rib (in a double-limb, large-angle inclined arch rib cable-stayed bridge, the arrangement and connection method of the bottom of the starting section 70 of the arch rib (i.e., the arch foot) is one of the key structural design factors, directly affecting the force transmission and overall stability of the arch rib 10. The bottom of the starting section 70 of the arch rib is usually located in one of the following two positions: A. On the top of the piers / abutments on both sides of the main beam 30, the arch foot is directly anchored to the bearing platform on the top of the pier or abutment, separated from the main beam 30 or connected by a hinge; B. At the bottom of the main beam 30 (fixed to the beam body), the arch foot is embedded in the box girder of the main beam and rigidly connected to the main beam 30), insert the pin; set one or more sets of vertical pivot cables 80 between the anchor tower 40 and the arch rib 10; complete the connection of the hinge with the starting section and the vertical pivot cable 80 for each pair of arch ribs in this way (e.g. Figure 3 (as shown);

[0010] (3) Arch Rib 10 Vertical Turning Stage

[0011] Tension the vertical rotating cable 80 (the vertical rotating cables 80 of a pair of arch ribs 10 must be tensioned simultaneously) to make the pair of arch ribs 10 rotate vertically to the design angle with the arch rib vertical rotating hinge 11 as the axis. According to the setting position of the arch rib vertical rotating hinge 11, weld the contact position between the arch rib 10 and the arch rib starting section 70 (filling section 170) (e.g. Figure 4 (As shown).

[0012] At this point, the horizontal assembly, hinge, and vertical rotation of the pair of arch ribs 10 to the designed angle are completed, thus completing the installation of the double-limb, large-angle inclined arch ribs.

[0013] When using the horizontal assembly and vertical rotation scheme, the pylon 40 is the most important load-bearing structure for the vertical rotation of the arch rib 10. The higher the pylon 40, the larger the angle between the vertical rotation cable 80 and the horizontal plane can be during the vertical rotation of the arch rib 10, and the higher the efficiency of converting the tension of the vertical rotation cable 80 into the vertical lifting force of the arch rib 10. However, increasing the height of the pylon 40 will have the following problems:

[0014] (1) Large material input

[0015] When the arch rib 10 rotates vertically, its self-weight is borne jointly by the vertical pivot hinge 11 and the vertical pivot cable 80 at the bottom of the arch rib 10. Considering the reasonable stress on the arch rib 10 during vertical rotation, when a single vertical pivot cable 80 is installed, the anchoring point of the vertical pivot cable 80 on the arch rib 10 is generally 1 / 4 of the arch rib length from the top of the arch rib. Compared to the vertical pivot hinge, the vertical pivot cable 80 bears more than 1 / 2 of the self-weight of the arch rib 10. This part of the self-weight of the arch rib 10 is ultimately borne by the buckle tower 40. If the anchorage position of the vertical cable 80 on the arch rib 10 remains unchanged, and the included angle of the vertical cable 80 changes due to the change in the height of the tower 40, the self-weight of the arch rib 10 borne by the tower 40 remains basically unchanged; the vertical external load borne by the tower 40 is always the self-weight of the arch rib 10. If the self-weight of the tower 40 is not considered, the tower 40 can be regarded as a structure with a uniform cross-section from top to bottom. If the height of the tower 40 increases, the material input increases proportionally with the height.

[0016] (2) High equipment requirements

[0017] ① The tower is 40mm high, requiring a floating crane with sufficient lifting height for installation. To meet this requirement, it is often necessary to select an ultra-large tonnage floating crane that does not match the lifting capacity requirements of the main beam (30mm) or arch rib (10mm), increasing equipment costs (e.g., Figure 6 (as shown);

[0018] ② The extra height of the part above the hook of the ultra-large tonnage floating crane is too high, making it difficult to use in some locations with height restrictions.

[0019] (3) Slow installation speed

[0020] To avoid using ultra-large tonnage floating cranes and reduce equipment costs, while also eliminating the risk of excessive boom height during floating crane lifting, and based on the requirement to meet the lifting needs of the arch rib segments, the selection of floating cranes was based on the following criteria: for some sections of the tower crane within the selected lifting height range, large-segment installation was carried out using floating cranes; for sections exceeding the lifting height capacity, installation was carried out by tower cranes (e.g., Figure 7 (As shown).

[0021] Because tower cranes have low lifting capacity and tower clamping components are heavy, tower clamping components need to be lifted individually or in groups of several when using tower cranes for installation, resulting in a slow overall installation speed.

[0022] Against this backdrop, the applicant has proposed a new solution for the installation of double-limbed, large-angle inclined arch ribs. Utility Model Content

[0023] This utility model aims to solve at least one of the technical problems existing in the conventional methods for installing arch ribs in double-limb, large-angle inclined arch-rib cable-stayed bridges, such as high tower height, large material input, high equipment requirements, and slow installation speed. To this end, this utility model proposes an installation structure for the arch ribs in double-limb, large-angle inclined arch-rib cable-stayed bridges, which can reduce the tower height, save on temporary structural materials and equipment input, and accelerate the installation speed of the arch ribs. The technical solution adopted includes:

[0024] An installation structure for the arch ribs of a double-limb, large-angle inclined arch-rib cable-stayed bridge, comprising:

[0025] Arch rib assembly bracket;

[0026] Arch rib starting section;

[0027] A pair of arch ribs, which are then divided into a pair of upper arch ribs and a pair of lower arch ribs;

[0028] The height of the pylon is 1 / 2 of the length of the arch rib;

[0029] The first vertical cable connects the tower and the two lower arch ribs.

[0030] The second vertical cable connects the tower and the two upper arch ribs; and

[0031] A pair of upper arch rib lifting systems are installed on both sides of the tower and are used to lift a pair of upper arch ribs respectively;

[0032] The lower arch rib is hinged to the starting section of the arch rib, and the lower arch rib rotates vertically under the control of the vertical rotation cable.

[0033] When the upper arch rib is vertically rotated under the control of the second tensioning of the vertical rotating cable, and is in a vertically tilted and lifted state, the bottom of the upper arch rib corresponds and matches the top of the lower arch rib.

[0034] According to an embodiment of the present invention, an installation structure for the arch rib of a double-limb, large-angle inclined arch-rib cable-stayed bridge is provided on the anchor tower. One end of the anchor tower cable is fixed to the anchor tower, and the other end is fixed to the main beam.

[0035] According to an embodiment of the present invention, an installation structure for the middle arch rib of a double-limb, large-angle inclined arch-rib cable-stayed bridge is provided, in which a vertical rotating ear plate is installed at the bottom of the lower arch rib, the vertical rotating ear plate is aligned and connected with the starting section of the arch rib, and a rotating shaft is provided at the connection.

[0036] According to an embodiment of the present invention, an installation structure for the arch ribs in a double-limbed, large-angle inclined arch-rib cable-stayed bridge is provided, wherein when the pair of lower arch ribs are in a vertical state, a connecting rod is provided between the two lower arch ribs.

[0037] According to an embodiment of the present invention, an installation structure for the middle arch rib of a double-limb, large-angle inclined arch-rib cable-stayed bridge is provided, wherein the pair of upper arch ribs are in a vertical tilting state controlled by the tensioning of the second vertical rotating cable, and connecting rods two and three are provided between the pair of upper arch ribs.

[0038] According to an embodiment of the present invention, an installation structure for the arch rib of a double-limb, large-angle inclined arch-rib cable-stayed bridge includes two pairs of support towers located on both sides of the main beam, and a square tower top located on the support towers.

[0039] Compared with the prior art, the beneficial effects of this utility model are:

[0040] This utility model provides an installation structure for the arch rib of a double-limb, large-angle inclined arch-rib cable-stayed bridge, which is a low-position vertical rotation and overall lifting scheme. The entire structure assists in the horizontal assembly of the lower and upper arch ribs on the arch rib assembly bracket and the main beam, respectively. The lower arch rib is then vertically rotated to a vertical position, and the upper arch rib is vertically rotated to the designed inclination angle. Then, the upper arch rib is lifted, followed by the lower arch rib being vertically rotated to the designed inclination angle. The arch ribs are then lowered to the designed position, aligning the bottom of the upper arch rib with the top of the lower arch rib. Finally, the upper and lower arch ribs are connected as a whole. Using this utility model's structural scheme for arch rib installation greatly reduces the difficulty and installation risk. This utility model's structural scheme greatly reduces the equipment requirements and hoisting requirements, shortens the installation time required for tower clamping, and speeds up tower clamping installation, significantly reducing the installation time of the double-limb, large-angle inclined arch rib. Attached Figure Description

[0041] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0042] Figure 1 A schematic diagram of a double-limbed, large-angle inclined arch-rib cable-stayed bridge;

[0043] Figure 2 A schematic diagram of the arch rib installation steps in the existing technology. Figure 1 ;

[0044] Figure 3 A schematic diagram of the arch rib installation steps in the existing technology. Figure 2 ;

[0045] Figure 4 A schematic diagram of the arch rib installation steps in the existing technology. Figure 3 ;

[0046] Figure 5 This is a schematic diagram of an arch rib structure in the prior art;

[0047] Figure 6 Schematic diagram of tower installation in some embodiments of the prior art Figure 1 ;

[0048] Figure 7 Schematic diagram of tower installation in some embodiments of the prior art Figure 2 ;

[0049] Figure 8 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 1 ;

[0050] Figure 9 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 2 ;

[0051] Figure 10 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 3 ;

[0052] Figure 11 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 4 ;

[0053] Figure 12 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 5 ;

[0054] Figure 13 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 6 ;

[0055] Figure 14 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 7 ;

[0056] Figure 15 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 8 ;

[0057] Figure 16 Some embodiments of this utility model application are illustrated for the arch rib installation steps. Figure 9 .

[0058] Explanation of key component symbols:

[0059] 10. Arch rib; 11. Arch rib vertical hinge; 20. Cable; 30. Main beam; 40. Tower; 50. Tower guy rope; 60. Arch rib mounting bracket; 70. Arch rib starting section; 80. Vertical rotating cable; 90. Lower arch rib; 91. Vertical rotating ear plate; 92. Rotating shaft; 100. Vertical rotating cable one; 110. Connecting rod one; 120. Upper arch rib; 130. Vertical rotating cable two; 140. Upper arch rib lifting system; 150. Connecting rod two; 160. Connecting rod three; 170. Filling section. Detailed Implementation

[0060] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0061] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0062] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0063] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0064] This utility model provides an installation structure for the arch ribs in a double-limb, large-angle inclined arch-rib cable-stayed bridge, including:

[0065] 60 arch rib assembly bracket;

[0066] Arch rib starting section 70;

[0067] A pair of arch ribs 10, the pair of arch ribs 10 are divided into a pair of upper arch ribs 120 and a pair of lower arch ribs 90;

[0068] The construction of the bridge tower foundation involves erecting tower 40, which is typically located on the top of the pier or on the main beam 30, near the starting section 70 of the arch rib. The height of the tower 40 is half the length of the arch rib 10. Each tower 40 includes two pairs of supporting towers located on either side of the main beam 30, and a square tower top mounted on the supporting towers. Tower guy ropes 50 are installed on the tower 40, with one end fixed to the tower 40 and the other end fixed to the main beam 30, symmetrically positioned at the top of the tower 40. The guy rope 50 of the tower cable is anchored to the main beam 30 in a three-dimensional radial pattern;

[0069] The vertical rotating cable 100 connects to the buckle tower 40 and the two lower arch ribs 90 respectively;

[0070] Vertical cable 130 connects to the tower 40 and two upper arch ribs 120; and

[0071] A pair of upper arch rib lifting systems 140 are provided on both sides of the tower 40 and are used to lift a pair of upper arch ribs 120 respectively;

[0072] The lower arch rib 90 is hinged to the starting section 70 of the arch rib, and the lower arch rib 90 is vertically rotated under the tension control of the vertical rotation cable 100.

[0073] The upper arch rib 120 is vertically rotated under the tensioning control of the vertical rotating cable 130, and when it is in a vertically rotated, tilted and lifted state, the bottom of the upper arch rib 120 corresponds and matches the top of the lower arch rib 90.

[0074] In use, first assemble a pair of lower arch ribs 90 on the top surface of the arch rib mounting bracket 60 and the main beam 30. Then, hinge the pair of lower arch ribs 90 and the starting section 70 of the arch rib respectively. Specifically, install the vertical rotating ear plate 91 at the bottom of the lower arch rib 90, align the vertical rotating ear plate 91 with the starting section 70 of the arch rib, and connect the rotating shaft 92 between the two to complete the hinge of the lower arch rib 90 and the starting section 70 of the arch rib. Then, connect and install a pair of vertical rotating cables 100 to the buckle tower 40 and the pair of lower arch ribs 90 respectively. At this time, the assembly of the lower arch ribs 90, the hinge of the lower arch ribs 90 and the starting section 70 of the arch rib, and the connection of the lower arch ribs 90 and the vertical rotating cables 100 are completed.

[0075] Next, the vertical rotating cable 100 is tensioned synchronously, and the pair of lower arch ribs 90 are rotated vertically to the vertical direction. At this time, the pair of lower arch ribs 90 are in a vertical state. A connecting rod 110 is set between the two lower arch ribs 90 (the connecting rod between the arch ribs (the transverse connecting member) is a key design to ensure the overall stability and mechanical performance of the structure. It has the functions of stability control, load transfer, and geometric maintenance. The connecting rods 150 and 160 below are also like this).

[0076] A pair of upper arch ribs 120 are assembled on the top surface of the arch rib mounting bracket 60 and the main beam 30. Then, a pair of vertical rotating cables 130 are connected and installed to the buckle tower 40 and the pair of upper arch ribs 120 respectively. At this time, the assembly of the upper arch ribs 120 and the connection between the upper arch ribs 120 and the vertical rotating cables 130 are completed. Then, the vertical rotating cables 130 are tensioned to lift the upper end of the upper arch ribs 120, so that the upper arch ribs 120 tilt upward. Then, the vertical rotating cables 130 are tensioned again to make the pair of upper arch ribs 120 rotate vertically to the designed tilt angle of the upper arch ribs 120. At this time, the pair of upper arch ribs 120 are in the vertical rotation tilt state controlled by the tension of the vertical rotating cables 130. Connecting rods 150 and 160 are set between the pair of upper arch ribs 120.

[0077] The upper arch rib lifting system 140 installed on the tower is connected to a pair of upper arch ribs 120. A pair of vertical rotating cables 130 are released, and then the pair of upper arch rib lifting systems 140 are driven to lift the upper arch ribs 120 synchronously until the bottom of the upper arch ribs 120 is not less than 50cm above the design elevation.

[0078] Remove connecting rod 110 and release a pair of vertical rotating cables 100, so that a pair of lower arch ribs 90 can rotate vertically to the designed tilt angle of the lower arch ribs 90. At this time, the tilt angle of the lower arch ribs 90 is consistent with the tilt angle of the upper arch ribs 120. At this time, the bottom of the upper arch ribs 120, which is in a vertical rotation tilt and lifting state, corresponds to the top of the lower arch ribs 90.

[0079] First, weld the supplementary section 170 between the lower arch rib 90 and the starting section 70 of the arch rib. Then, simultaneously lower a pair of upper arch ribs 120 as a whole through a pair of upper arch rib lifting systems 140. Align the top of the lower arch rib 90 with the bottom of the upper arch rib 120, and weld the seam between the upper arch rib 120 and the lower arch rib 90 to complete the overall connection of the upper arch rib 120 and the lower arch rib 90. Thus, the installation of a pair of double-limbed large-angle inclined arch ribs is completed.

[0080] This utility model provides an installation structure for the middle arch rib of a double-limb, large-angle inclined arch-rib cable-stayed bridge, which is a low-position vertical rotation and overall lifting scheme. The entire structure assists the lower arch rib 90 and the upper arch rib 120 to be assembled on the arch rib assembly bracket 60 and the main beam 30, respectively. The lower arch rib 90 is vertically rotated to the vertical direction, and the upper arch rib 120 is vertically rotated to the designed inclination angle. Then, the upper arch rib 120 is lifted, and then the lower arch rib 90 is vertically rotated to the designed inclination angle. Then, the arch rib 120 is lowered to the designed position, and the bottom of the upper arch rib 120 is aligned with the top of the lower arch rib 90. Finally, the upper arch rib 120 and the lower arch rib 90 are connected into a whole.

[0081] This invention divides the arch rib into two parts: a lower arch rib 90 and an upper arch rib 120. Horizontal assembly is completed on the arch rib assembly bracket 60. This assists the lower arch rib 90 and upper arch rib 120 in completing low-position vertical rotation, overall lifting, separate tilting, overall lowering and docking, and connecting them into a single unit. Compared with existing technologies that involve vertical rotation of the entire arch rib section, the installation difficulty and risk are significantly reduced. In this invention, the height of the pylon 40 is approximately half the height of the arch rib 10. Both the lower arch rib 90 and upper arch rib 120 undergo low-position vertical rotation, whereas in existing technologies, the height of the pylon 40 exceeds the height of the arch rib 10. This invention, by combining the stability of the pylon 40, can save costs. This invention saves approximately 40% on tower clamping materials. The structural design significantly reduces equipment requirements. Compared to existing technologies, the arch ribs 10 are all horizontally assembled. However, the maximum lifting height required by the hoisting equipment is determined by the height of the tower clamp 40. In this invention, the lifting height requirement of the upper arch rib lifting system 140 is significantly lower than in existing technologies, resulting in a higher match between the lifting weight and boom length of the hoisting equipment. The lower height of the tower clamp 40, achieved through large-segment floating crane hoisting, shortens the installation time. The increased installation speed of the tower clamp 40 determines the lead time for completing the arch rib installation, greatly reducing the installation time of the double-limb, large-angle inclined arch ribs. The lower height of the tower clamp 40 in this structural design saves on temporary structural materials and equipment investment, accelerating the arch rib installation speed.

[0082] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. An installation structure for the arch rib of a double-limb, large-angle inclined arch-rib cable-stayed bridge, characterized in that, Including Arch rib assembly bracket (60); Arch rib starting section (70); A pair of arch ribs (10), the pair of arch ribs (10) are split into a pair of upper arch ribs (120) and a pair of lower arch ribs (90); The height of the pylon (40) is 1 / 2 of the length of the arch rib (10); Vertical rotating cable 1 (100) is connected to the buckle tower (40) and two lower arch ribs (90) respectively; Vertical rotating cable 2 (130), which connects to the tower (40) and two upper arch ribs (120); and A pair of upper arch rib lifting systems (140) are provided on both sides of the tower (40) and are used to lift a pair of upper arch ribs (120) respectively; The lower arch rib (90) is hinged to the starting section (70) of the arch rib, and the lower arch rib (90) is controlled to rotate vertically by the tension of the vertical rotation cable (100); The upper arch rib (120) is controlled to rotate vertically by the tensioning of the second vertical rotating cable (130), and when it is in a vertically rotating, tilted and lifted state, the bottom of the upper arch rib (120) corresponds to and matches the top of the lower arch rib (90).

2. The installation structure of the arch rib in a double-limb, large-angle inclined arch-rib cable-stayed bridge according to claim 1, characterized in that, A guy rope (50) is installed on the tower (40). One end of the guy rope (50) is fixed to the tower (40), and the other end is fixed to the main beam (30).

3. The installation structure of the arch rib in a double-limb, large-angle inclined arch-rib cable-stayed bridge according to claim 1, characterized in that, A vertical rotating ear plate (91) is installed at the bottom of the lower arch rib (90), and the vertical rotating ear plate (91) is aligned and connected with the starting section (70) of the arch rib, and a rotating shaft (92) is provided at the connection.

4. The installation structure of the arch rib in a double-limb, large-angle inclined arch-rib cable-stayed bridge according to claim 1, characterized in that, When the pair of lower arch ribs (90) are in a vertical state, a connecting rod (110) is provided between the two lower arch ribs (90).

5. The installation structure of the arch rib in a double-limb, large-angle inclined arch-rib cable-stayed bridge according to claim 1, characterized in that, The pair of upper arch ribs (120) are in a vertical tilt state controlled by the tensioning of the second vertical rotating cable (130), and connecting rods two (150) and three (160) are set between the pair of upper arch ribs (120).

6. The installation structure of the arch rib in a double-limb, large-angle inclined arch-rib cable-stayed bridge according to claim 1, characterized in that, The tower (40) includes two pairs of support towers located on both sides of the main beam (30), and a square tower top set on the support towers.

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