Method for installing midspan tie bars of combined basket arch bridge

Abstract

The invention relates to the field of mid-span tie bar installation, and provides a combined type basket arch bridge mid-span tie bar installation method which comprises the following steps that S1, a site is prepared; s2, truss outriggers are installed at the ends of the arch rib cross beams; s3, an auxiliary supporting assembly is installed on the truss outrigger; the auxiliary supporting assembly comprises a hanging piece and a supporting roller, the hanging piece is vertically arranged, the supporting roller is rotationally connected to the hanging piece with the central axis of the supporting roller as the axis, and the supporting roller is used for supporting the tie bar; the multiple sets of auxiliary supporting assemblies are arranged at intervals in the laying direction of the tie bars. S4, one end of a traction rope is connected to the output end of the traction equipment, the other end of the traction rope is connected to the free end of the tie bar, and the traction rope is erected on the supporting roller; and S5, the traction equipment is started, and the end of the tie bar is driven to move from the position of the first operation platform to the position of the second operation platform. The middle-span tie bar traction device has the effects of reducing traction force needed in the middle-span tie bar traction process and improving the mounting precision of a tie bar.

Description

Technical Field

[0001] The present application relates to the field of mid-span tie rod installation, and in particular to a method for installing mid-span tie rods of a combined basket handle arch bridge. Background Art

[0002] With the continuous development of bridge engineering technology, long-span basket arch bridges have been widely used in modern bridge construction due to their beautiful shape and excellent mechanical properties. As a key load-bearing component of basket arch bridges, the installation quality of mid-span tie rods directly affects the overall stability and safety of the bridge.

[0003] At present, the common methods for installing the tie rods of basket arch bridges mainly include the following: one is to use a large traction device to tow the tie rods from one bank to the other when there are operating sites on both sides; the other is to use a boat to tow the ends of the tie rods in the river channel when it is inconvenient to set up operating sites on both sides.

[0004] However, no matter which of the above traction methods is used, due to the large weight of the tie rod, the required traction force during the traction process is extremely large, and the construction cost is high; and during the traction process, the tie rod is easily deformed or offset due to uneven traction force or uneven slideway, affecting the installation accuracy. Summary of the Invention

[0005] In order to reduce the traction force required during the traction process of the mid-span tie rods and improve the installation accuracy of the tie rods, the present application provides a method for installing the mid-span tie rods of a combined basket handle arch bridge.

[0006] The present application provides a method for installing the mid-span tie rods of a combined basket handle arch bridge using the following technical solutions: A method for installing a mid-span tie rod of a combined basket handle arch bridge comprises the following steps: S1: Site preparation: Build a first operating platform on one bank and place the coiled tie rods on the first operating platform; build a second operating platform on the other bank and place the traction equipment on the second operating platform; S2: Install truss cantilever beams at the ends of the arch rib beams; S3: Installing an auxiliary support assembly on the truss cantilever beam; the auxiliary support assembly includes a suspension member and a support roller, the suspension member is vertically arranged, the support roller is rotatably connected to the suspension member about its own central axis, the support roller is horizontally arranged, and the support roller is used to support the tie rod; the auxiliary support assembly is provided in multiple groups, and the multiple groups of auxiliary support assemblies are arranged at intervals along the laying direction of the tie rod; S4: Connect one end of the traction rope to the output end of the traction device, and the other end to the free end of the tie rod, and the traction rope is laid on the support roller; S5: starting the traction device, and using the traction device to drive the end of the tie rod to move from the position of the first operating platform to the position of the second operating platform; S6: temporarily anchoring the ends of the tie rods; S7: Initially tensioning the tie rod; S8: Formal tensioning and adjustment of the tie rod; S9: Anchoring and protection.

[0007] By adopting the above technical solution, the installation of the mid-span tie rods of the basket arch bridge can be achieved through the steps of building an operating platform, installing truss cantilevers and auxiliary support components, connecting traction ropes, starting traction equipment, temporary anchoring, tensioning adjustment and anchor protection.

[0008] Using auxiliary support components to support the tie rods can reduce resistance during traction, reduce the required traction force, and lower construction costs. At the same time, it can prevent the tie rods from being deformed or offset due to uneven traction or uneven slideways, improve installation accuracy, and ensure the overall stability and safety of the bridge.

[0009] Optionally, the support roller includes a support portion and limiting portions provided at both ends of the support portion, and the limiting portions are used to prevent the tie rod from rolling down from both ends of the support roller.

[0010] By adopting the above technical solution, the limiting portion is used to prevent the tie rod from rolling off the two ends of the support roller, thereby further ensuring the stability of the tie rod during the traction process.

[0011] Optionally, the supporting portion has a supporting surface, the limiting portion has a limiting surface, the supporting surface is arc-shaped, the limiting surface is arc-shaped, and the center of a circle corresponding to the supporting surface and the center of a circle corresponding to the limiting surface are concentric.

[0012] By adopting the above technical solution, after constructing the operating platform, positioning the tie rods and traction equipment, installing the truss cantilever beams and auxiliary support components, connecting the traction ropes, starting the traction equipment, anchoring the tie rod ends, and tensioning and adjusting the tie rods, support rollers are provided with curved support and limiting surfaces with a common center. This allows the curved support and limiting surfaces to better fit the tie rods while supporting them, improving the support stability of the tie rods. The limiting surfaces effectively prevent the tie rods from rolling off the ends of the support rollers, preventing them from shifting during the traction process. This improves tie rod installation accuracy, reduces deformation caused by tie rod shifting, and reduces construction costs. This also allows the support rollers to accommodate tie rods of different diameters.

[0013] Optionally, the suspension member includes two cables; the auxiliary support assembly also includes a mounting shaft, both ends of which are detachably connected to the two cables; the support roller is a hollow cylinder, and the support roller is sleeved on the mounting shaft.

[0014] By adopting the above technical solution, site preparation and the construction of the operating platform provide the basic conditions for the installation of the tie rod. The truss cantilever beam and the auxiliary support assembly are installed at the end of the arch rib beam to support the tie rod. The suspension parts in the auxiliary support assembly use two cables, and the two ends of the installation shaft are detachably connected to the cables. The support roller is sleeved on the installation shaft. This structure facilitates the installation and disassembly of the support roller and is convenient for adjustment and maintenance according to actual conditions. At the same time, the support roller can rotate around the installation shaft, which can reduce the friction of the tie rod during movement and reduce damage to the tie rod. The traction rope is laid on the support roller and connects the tie rod to the traction equipment, which can smoothly drive the end of the tie rod to move. The tie rod is subsequently temporarily anchored, tensioned, adjusted, anchored and protected to ensure the stable installation of the tie rod and the overall stability and safety of the bridge.

[0015] Optionally, the S3 step also includes: S31: installing a guide assembly between adjacent auxiliary support assemblies, the guide assembly including a guide member, both ends of which are respectively connected to two adjacent groups of auxiliary support assemblies; the guide member has a guide surface, and the end face of the guide surface extends to the support surface of the support roller.

[0016] By adopting the above technical solution, a guide assembly is installed between adjacent auxiliary support assemblies, the two ends of the guide are connected to the adjacent auxiliary support assemblies, and the end surface of the guide surface extends to the support surface of the support roller, which can guide the movement of the tie rod, so that the tie rod can better move along the predetermined route during the movement, improve the accuracy of the tie rod installation, and reduce the possibility of deformation or offset of the tie rod. At the same time, combined with the solution of the auxiliary support assembly, the stable support of the tie rod during the installation process can be further guaranteed, the impact of uneven traction or uneven slide on the tie rod can be reduced, the required traction force can be reduced, and the construction cost can be reduced.

[0017] Optionally, the guide assembly further includes a mounting seat and a rotating shaft, the mounting seat is used to be detachably connected to the auxiliary support assembly, and the rotating shaft is rotatably connected to the mounting seat around its own central axis; the guide member is made of a flexible material, and the guide member is wrapped around the rotating shaft.

[0018] By adopting the above technical solution, when installing the mid-span tie rods of the combined basket arch bridge, a guide assembly is installed between adjacent auxiliary support assemblies, the guide member is wrapped around the rotating shaft, and the rotating shaft is rotatably connected to the mounting seat, and the mounting seat is detachably connected to the auxiliary support assembly. At the same time, the guide member is made of flexible material, which can flexibly adapt to changes in the laying direction of the tie rod, better provide guidance for the tie rod, reduce the risk of deformation or offset due to uneven traction or uneven slideway during the traction process of the tie rod, improve installation accuracy, and the detachable connection facilitates the installation and disassembly of the guide assembly, thereby improving construction efficiency.

[0019] Optionally, the mounting seat is provided with a spring, and when the free end of the guide member is connected to another auxiliary support assembly, the spring is in a tightened state.

[0020] By adopting the above technical solution, when installing the guide part, the free end of the guide part is connected to another auxiliary support assembly to tighten the spring. When the tie rod is installed and the guide part is removed, the spring can use the elastic potential energy in the tightened state to automatically retract the guide part, thereby improving the removal efficiency, reducing manual operations, and allowing the guide part to be reused, reducing costs.

[0021] Optionally, stiffening strips are provided on both sides of the guide member, and the stiffening strips are extended along the length direction of the guide member, and the hardness of the stiffening strips is greater than the hardness of the guide member.

[0022] By adopting the above technical solution, on the basis of site preparation, construction of operating platform, installation of truss cantilever beam and auxiliary support assembly, connection of traction rope, traction tie rod, temporary anchoring, initial tensioning, formal tensioning and adjustment, and anchor protection, a guide assembly is installed between adjacent auxiliary support assemblies. The guide assembly includes a guide member wound around a rotating shaft and made of flexible material. The two ends of the guide member are connected to adjacent auxiliary support assemblies and the guide surface extends to the support surface of the support roller. The mounting seat is provided with a spring, and hardening strips are provided on both sides of the guide member, which extend along its length direction and have a harderness greater than that of the guide member. This can improve the strength and stability of the guide member, prevent the guide member from being deformed or damaged during the traction of the tie rod, and ensure the smooth traction and installation accuracy of the tie rod.

[0023] Optionally, after the guide member is unfolded, a side of the guide member close to the installation axis faces upward.

[0024] By adopting the above technical solution, when installing the mid-span tie rods of the combined basket arch bridge, the guide members can be deployed upward in a suitable direction, and the guiding function of the guide assembly on the tie rods can be coordinated to ensure that the tie rods can move stably along the predetermined path during the laying process, avoid the deviation of the tie rods, and improve the installation accuracy of the tie rods. At the same time, combined with the auxiliary support assembly and other settings, the deformation of the tie rods during the traction process can be reduced, thereby reducing the required traction force and construction costs.

[0025] Optionally, the guide member includes two connecting ropes and multiple installation ropes, the two ends of the installation ropes are respectively connected to the two connecting ropes, and the multiple installation ropes are arranged at intervals along the length direction of the connecting ropes; a rolling member is provided on the installation rope, and the rolling member is used for the tie rod to abut.

[0026] By adopting the above technical solution, when installing the tie rods in the middle span of the combined basket arch bridge, the rollers mounted on the installation ropes that are arranged at intervals and connected to the two connecting ropes can be used for the tie rods to abut against, thereby reducing the friction between the tie rods and the guide members, making the tie rods move more smoothly during the installation process, reducing the difficulty of traction and the construction cost. At the same time, the provision of multiple installation ropes and rollers can ensure the stability of the tie rod movement path and improve the installation accuracy.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up auxiliary support components, the tie rods are supported during the traction process, reducing the traction force required during the traction of the mid-span tie rods and improving the installation accuracy of the tie rods; 2. The support roller includes a limiter to prevent the tie rod from rolling off the sides of the support roller, ensuring the effective assistance of the auxiliary support assembly and the installation accuracy of the tie rod; 3. By arranging guide assemblies between adjacent auxiliary support assemblies, the guide assemblies are used to further support the tie rods and also to establish connections between adjacent auxiliary support assemblies, thereby further ensuring the smoothness and accuracy of the tie rod traction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0029] Figure 2 It is a structural diagram for showing the completion of installation of the auxiliary support assembly in Example 1.

[0030] Figure 3 It is a schematic diagram for showing the structure of the auxiliary support assembly in Example 1.

[0031] Figure 4 It is a structural diagram of Example 2 of the present application.

[0032] Figure 5 It is a structural diagram of Example 3 of the present application.

[0033] Figure 6 It is a schematic diagram for showing the structure of the guide component in Example 3.

[0034] Figure 7 It is a schematic diagram for showing the structure of the mounting groove and the mounting protrusion in Example 3.

[0035] Figure 8 It is a structural diagram of Example 4 of the present application.

[0036] Figure 9 It is a structural diagram of Example 5 of the present application.

[0037] Figure 10It is a schematic diagram for showing the structure of the guide member in Example 5.

[0038] Explanation of the accompanying drawings: 1. First operating platform; 2. Second operating platform; 3. Arch rib beam; 4. Truss cantilever beam; 5. Auxiliary support assembly; 51. Suspension member; 511. Mounting plate; 512. Snap-in groove; 513. Hanging ring; 52. Mounting shaft; 53. Support roller; 531. Support part; 532. Limiting part; 533. Snap-in block; 6. Guide assembly; 61. Guide member; 611. Guide surface; 612. Connecting rope; 613. Mounting rope; 614. Rolling member; 62. Mounting seat; 621. Mounting groove; 622. Lobster clasp; 623. Spring; 63. Rotating shaft; 631. Mounting protrusion; 64. Fixed shaft. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-10 This application is described in further detail.

[0040] The embodiment of the present application discloses a method for installing mid-span tie rods of a combined basket handle arch bridge.

[0041] Example 1 Reference Figure 1 and Figure 2 A method for installing a mid-span tie rod of a combined basket handle arch bridge comprises the following steps: S1: Site Preparation: Clear the arch foot anchoring area to ensure sufficient operating space. Build the first operating platform 1 on one bank and place the coiled tie rods on it. Build the second operating platform 2 on the other bank and place the traction equipment on it.

[0042] S2: Install the truss cantilever beam 4 at the end of the arch rib beam 3. The truss cantilever beam 4 can be made of steel and has strong structural strength. It can be installed by welding or bolting to ensure a firm connection with the arch rib beam 3, providing support for the subsequent installation of the auxiliary support assembly 5. S3: Install auxiliary support assembly 5 on truss cantilever beam 4; auxiliary support assembly 5 includes suspension member 51 and support roller 53. Suspension member 51 is vertically arranged, support roller 53 is rotatably connected to suspension member 51 about its own central axis, and support roller 53 is horizontally arranged to support tie rod. Multiple groups of auxiliary support assemblies 5 are provided, and multiple groups of auxiliary support assemblies 5 are arranged at intervals along the laying direction of tie rod. S4: Connect one end of the traction rope to the output end of the traction device and the other end to the free end of the tie rod. The traction rope is laid on the support roller 53. S5: Start the traction device and use the traction device to drive the end of the tie rod to move from the position of the first operating platform 1 to the position of the second operating platform 2; S6: Temporarily anchor the ends of the tie rods; S7: initial tension tie; S8: Formal tensioning and adjustment of tie rods; S9: Anchoring and protection.

[0043] Reference Figure 3 Specifically, the auxiliary support assembly 5 includes a suspension member 51, an installation shaft 52, and a support roller 53. The suspension member 51 includes two cables, which can be made of high-strength steel wire ropes with good tensile strength. One end of the cable is connected to the truss cantilever beam 4, and the other end is used to connect to the installation shaft 52. In this embodiment, the two cables are integrally formed, with the middle portion spanning the truss cantilever beam 4 and fixed to the truss cantilever beam 4 using steel bar binding. The two ends hang down to the installation position of the support roller 53.

[0044] The lower end of the cable is fixedly connected to a mounting plate 511, and the opposing surfaces of the two mounting plates 511 are integrally formed with a snap-in block 533. Both ends of the mounting shaft 52 are provided with a snap-in groove 512 for quick snap-in connection, so that the mounting shaft 52 and the suspension part 51 can be detachably connected by the cooperation of the snap-in groove 512 and the snap-in block 533.

[0045] The support roller 53 is hollow and sleeved outside the mounting shaft 52 to achieve a rotational connection between the support roller 53 and the cable.

[0046] The support roller 53 includes a support portion 531 and stoppers 532 disposed at both ends of the support portion 531. The stoppers 532 are used to prevent the tie rod from rolling off the ends of the support roller 53. In this embodiment, the stoppers 532 are fixedly connected to both ends of the mounting shaft 52, and the support portion 531 is located between the two stoppers 532.

[0047] The implementation principle of Example 1 is: by building an operating platform, it is convenient to place the tie rods and put the traction equipment in place. Install the truss cantilever beam 4 and the auxiliary support assembly 5 to provide support and guidance for the traction of the tie rod, reduce the friction between the tie rod and the supporting structure, and reduce the required traction force. When pulling the tie rod, start the traction equipment, and use the traction equipment to drive the end of the tie rod from the position of the first operating platform 1 to the position of the second operating platform 2. Due to the rotation of the support roller 53, the friction between the tie rod and the support roller 53 can be reduced, and the required traction force is reduced. At the same time, the design of the limit part 532 can prevent the tie rod from shifting and improve the installation accuracy. Thereby improving the problems of large traction force and low installation accuracy in the existing basket arch bridge tie rod installation method, improving the construction efficiency and the overall quality of the bridge.

[0048] Example 2 Reference Figure 4This embodiment differs from Example 1 in that the support portion 531 has a support surface, and the limiting portion 532 has a limiting surface. The support surface is arc-shaped, and the limiting surface is arc-shaped, with the center of the circle corresponding to the support surface and the center of the circle corresponding to the limiting surface collinear. This arrangement creates an arc transition between the support surface and the limiting surface, thereby limiting the tie rod and making the support roller 53 suitable for tie rods of varying diameters.

[0049] Example 3 Reference Figures 5 to 7 This embodiment differs from Embodiment 2 in that step S3 further includes the following: S31: installing a guide assembly 6 between adjacent auxiliary support assemblies 5. The guide assembly 6 includes a guide member 61, with both ends of the guide member 61 connected to two adjacent sets of auxiliary support assemblies 5. The guide member 61 has a guide surface 611, with the end surface of the guide surface 611 extending to the support surface of the support roller 53. Thus, the guide assembly 6 guides and supports the tie rod between adjacent auxiliary support assemblies 5. This not only ensures the accuracy of the tie rod's moving direction, but also prevents the free end of the tie rod from drooping excessively during movement from one set of auxiliary support assemblies 5 to another, facilitating smooth movement of the free end of the tie rod to the next set of auxiliary support assemblies 5. Furthermore, the guide assembly 6 also establishes a connection between adjacent auxiliary support assemblies 5, thereby reducing the possibility of the entire auxiliary support assembly 5 swinging in the direction of the tie rod's movement during the process of pulling the tie rod, further ensuring the stability and accuracy of the tie rod's movement.

[0050] The guide assembly 6 further includes a mounting base 62 and a rotating shaft 63. The mounting base 62 is detachably connected to the auxiliary support assembly 5, and the rotating shaft 63 is rotatably connected to the mounting base 62 about its own central axis. The guide member 61 is made of a flexible material, such as nylon cloth, and is wrapped around the rotating shaft 63, thereby facilitating the installation, storage, and transportation of the guide member 61.

[0051] Specifically, two mounting seats 62 are provided, and the rotating shaft 63 is located between the two mounting seats 62. Annular mounting grooves 621 are formed on the two opposing surfaces of the two mounting seats 62. The center of the mounting groove 621 is collinear with the central axis of the rotating shaft 63. A mounting protrusion 631 is integrally formed at the end of the rotating shaft 63. The mounting protrusion 631 cooperates with the mounting groove 621 to achieve a rotational connection between the rotating shaft 63 and the mounting groove 621.

[0052] The mounting plate 511 is welded with a hanging ring 513, and the mounting seat 62 is welded with a lobster clasp 622. The lobster clasp 622 cooperates with the hanging ring 513 to realize the detachable connection between the mounting seat 62 and the mounting plate, thereby realizing the detachable connection between the guide assembly 6 and the auxiliary support assembly 5.

[0053] It can be understood that the mounting plate 511 is provided with a plurality of hanging rings 513, and the free end of the guide member 61 is also fixed with a lobster clasp 622, and the detachable connection between the free end of the guide member 61 and the auxiliary support assembly 5 is realized through the detachable cooperation between the lobster clasp 622 and the hanging ring 513.

[0054] Furthermore, after the guide member 61 is deployed, the surface of the guide member 61 closest to the mounting shaft 52 faces upward. With this design, as the tie rod moves, the tie rod drives the rotating shaft 63 to continue rotating, causing the middle portion of the guide member 61 to move downward due to its own weight. This in turn causes the guide surface 611 to move away from the tie rod, reducing friction between the tie rod and the guide.

[0055] Example 4 Reference Figure 8 This embodiment differs from Embodiment 3 in that the mounting base 62 is provided with a spring 623. When the free end of the guide member 61 is connected to another auxiliary support assembly 5, the spring 623 is in a tightened state. To remove the guide assembly 6, simply detach the free end of the guide member 61 from the auxiliary support assembly 5 to which it is connected. The spring 623 then automatically rewinds the guide member 61 around the rotating shaft 63, making the removal, transportation, and storage of the guide assembly 6 more convenient.

[0056] Specifically, the guide assembly 6 further includes a fixed shaft 64, the ends of which are fixedly connected to the two mounting seats 62, respectively. The rotating shaft 63 is hollow and sleeved outside the fixed shaft 64. The spring 623 is located between the inner wall of the rotating shaft 63 and the outer wall of the fixed shaft 64. One end of the spring 623 is fixed to the outer wall of the fixed shaft 64, and the other end is fixed to the inner wall of the rotating shaft 63. When the guide member 61 is fully wound around the rotating shaft 63, the spring 623 is in a relaxed state.

[0057] Example 5 Reference Figure 9 and Figure 10 This embodiment differs from Embodiment 3 in that the guide member 61 includes two connecting ropes 612 and multiple installation ropes 613. The ends of the installation ropes 613 are connected to the two connecting ropes 612, respectively. The multiple installation ropes 613 are arranged at intervals along the length of the connecting ropes 612. Rolling members 614 are sleeved on the installation ropes 613. The rolling members 614 are used to abut against the tie rod, so that the friction generated between the tie rod and the guide member 61 is primarily rolling friction, reducing wear on the tie rod and improving the smoothness of the tie rod traction.

[0058] Specifically, in this embodiment, the rolling element 614 is a cylindrical structure. In other embodiments, the rolling element 614 can also be a spherical structure. In this case, multiple rolling elements 614 need to be sleeved on one installation rope 613.

[0059] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for installing mid-span tie rods of a combined basket handle arch bridge, characterized by: The steps include: S1: Site preparation: build a first operating platform (1) on one bank, and place the coiled tie rod on the first operating platform (1); build a second operating platform (2) on the other bank, and place the traction equipment on the second operating platform (2); S2: Installing a truss cantilever beam (4) at the end of the arch rib beam (3); S3: installing an auxiliary support assembly (5) on the truss cantilever beam (4); the auxiliary support assembly (5) comprises a suspension member (51) and a support roller (53), the suspension member (51) is vertically arranged, the support roller (53) is rotatably connected to the suspension member (51) with its own central axis as an axis, the support roller (53) is horizontally arranged, and the support roller (53) is used to support the tie rod; the auxiliary support assembly (5) is provided with multiple groups, and the multiple groups of the auxiliary support assembly (5) are arranged at intervals along the laying direction of the tie rod; S4: connecting one end of the traction rope to the output end of the traction device and the other end to the free end of the tie rod, the traction rope being laid on the support roller (53); S5: starting the traction device, and using the traction device to drive the end of the tie rod to move from the position of the first operating platform (1) to the position of the second operating platform (2); S6: temporarily anchoring the ends of the tie rods; S7: Initially tensioning the tie rod; S8: Formal tensioning and adjustment of the tie rod; S9: Anchoring and protection.

2. The method for installing the mid-span tie rods of a combined basket handle arch bridge according to claim 1, characterized in that: The support roller (53) comprises a support portion (531) and limiting portions (532) arranged at both ends of the support portion (531), wherein the limiting portions (532) are used to prevent the tie rod from rolling off from both ends of the support roller (53).

3. The method for installing the mid-span tie rods of a combined basket handle arch bridge according to claim 2, characterized in that: The supporting portion (531) has a supporting surface, and the limiting portion (532) has a limiting surface, the supporting surface is arc-shaped, the limiting surface is arc-shaped, and the center of the circle corresponding to the supporting surface and the center of the circle corresponding to the limiting surface are concentric.

4. The method for installing mid-span tie rods of a combined basket handle arch bridge according to claim 1, characterized in that: The suspension member (51) includes two cables; the auxiliary support assembly (5) also includes a mounting shaft (52), and both ends of the mounting shaft (52) are detachably connected to the two cables; the support roller (53) is a hollow cylinder, and the support roller (53) is sleeved on the mounting shaft (52).

5. The method for installing mid-span tie rods of a combined basket handle arch bridge according to claim 1, characterized in that: The S3 step further includes: S31: installing a guide assembly (6) between adjacent auxiliary support assemblies (5), wherein the guide assembly (6) includes a guide member (61), and both ends of the guide member (61) are respectively connected to two adjacent groups of auxiliary support assemblies (5); the guide member (61) has a guide surface (611), and the end surface of the guide surface (611) extends to the support surface of the support roller (53).

6. The method for installing mid-span tie rods of a combined basket handle arch bridge according to claim 5, characterized in that: The guide assembly (6) further comprises a mounting seat (62) and a rotating shaft (63), wherein the mounting seat (62) is used for being detachably connected to the auxiliary support assembly (5), and the rotating shaft (63) is rotatably connected to the mounting seat (62) about its own central axis; the guide member (61) is made of a flexible material, and the guide member (61) is wound around the rotating shaft (63).

7. The method for installing mid-span tie rods of a combined basket handle arch bridge according to claim 6, characterized in that: The mounting seat (62) is provided with a spring (623), and when the free end of the guide member (61) is connected to another auxiliary support assembly (5), the spring (623) is in a tightened state.

8. A method for installing tie rods in the middle span of a combined basket handle arch bridge according to claim 6 or 7, characterized in that: Both sides of the guide member (61) are provided with hardening strips, the hardening strips extending along the length direction of the guide member (61), and the hardness of the hardening strips is greater than the hardness of the guide member (61).

9. The method for installing mid-span tie rods of a combined basket handle arch bridge according to claim 8, characterized in that: After the guide member (61) is unfolded, the side of the guide member (61) close to the auxiliary support assembly (5) faces upward.

10. The method for installing mid-span tie rods of a combined basket handle arch bridge according to claim 9, characterized in that: The guide member (61) comprises two connecting ropes (612) and a plurality of installation ropes (613), the two ends of the installation ropes (613) being respectively connected to the two connecting ropes (612), and the plurality of installation ropes (613) being arranged at intervals along the length direction of the connecting ropes (612); a rolling member (614) is sleeved on the installation ropes (613), and the rolling member (614) is used for the tie rod to abut against.

Images