Space cable self-anchored suspension bridge main cable erecting method utilizing main cable saddle splitting and displacement

Abstract

The invention relates to the technical field of bridge construction, in particular to a method for erecting a main cable of a space cable self-anchored suspension bridge by means of main cable saddle splitting displacement, which comprises the following steps: splitting a main cable saddle; two parts of a main cable saddle are erected on the top of the bridge tower at intervals, and a pushing device is arranged; catwalk construction is conducted, and the two catwalks are arranged in parallel; main cable construction is conducted, the two main cables are arranged in parallel, and temporary buckle cables are arranged between the main beams and the main cables; active cross braces are installed between the parallel main cables, and the main cables and the catwalk are opened through the active cross braces; the pushing device is used for folding the two parts of the main cable saddle, and combination of the main cable saddle and conversion of the main cable from a plane system to a space system are completed; according to the space cable self-anchored suspension bridge main cable erecting method utilizing main cable saddle splitting and displacement, the situation that enough distance is not reserved when parallel catwalks are erected can be avoided, and the problems that space is limited and operation is inconvenient are solved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to a method for erecting main cables of a space cable self-anchored suspension bridge by utilizing the splitting and displacement of a main cable saddle. Background Art

[0002] The self-anchored suspension bridge is a unique bridge structure, characterized by the absence of traditional anchors between the bridge tower and the main cable. Instead, the bridge deck is suspended by transferring force to the bridge tower through the deadweight of the bridge deck and the suspension cables. This structure is usually suitable for bridges with larger spans, can effectively reduce the demand for bridge foundations, and has good wind resistance and stability. It is often used to cross large rivers or canyons.

[0003] However, for the spatial cable structure, the process of converting the plane system into the spatial system faces many technical challenges, because the plane system usually considers two-dimensional mechanical balance, while the spatial system needs to consider three-dimensional force and deformation. In the prior art, the patent with publication number CN117684477A discloses a method for erecting the main cable of a self-anchored suspension bridge with a spatial cable structure, including cable strand traction, cable strand lifting and lateral movement, cable strand shaping, cable strand saddle entry, cable strand tightening, and main cable system conversion. Based on the spatial cable structure system of the self-anchored suspension bridge, 5 pairs of temporary slings and 2 main towers are used in the middle span to separate the main cables, and then the slings are tensioned in batches from the side of the tower column to the middle span direction of the middle span to separate the main cables. After the main cables are separated in place, permanent cable clamps and slings are installed and tensioned, and the angle of the permanent cable clamps is gradually adjusted according to the monitoring instructions by using steel wire ropes and hand winches to perform system conversion. Such erection methods as the above can realize the system conversion from the plane to the space of the main cable of the self-anchored suspension bridge, and solve the problem of the formation of the spatial line shape of the main cable.

[0004] In the above-mentioned prior art, it is usually necessary to set up a catwalk in advance before pulling the cable strands, also known as a temporary construction walkway or a hoisting walkway. The catwalk is to ensure the safety of construction workers and provide necessary passages and supports for hoisting equipment. Usually, the parallel catwalks need to be close to the main cable saddle or on the same line as the main cable saddle to facilitate subsequent operations such as saddle entry of the cable strands. However, the width of the main cable saddle is small, which often makes the distance between the parallel catwalks close, resulting in insufficient distance between the parallel catwalks during the installation process, resulting in limited space and inconvenient operation. Summary of the invention

[0005] In order to avoid the problem of insufficient distance between parallel catwalks during installation, thereby causing limited space and inconvenient operation, the present application provides a method for installing the main cable of a spatial cable self-anchored suspension bridge by splitting and shifting the main cable saddle.

[0006] The main cable installation method of the space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle provided by the present invention adopts the following technical solutions: The main cable erection method of a space cable self-anchored suspension bridge using splitting and displacement of a main cable saddle comprises the following steps: S1: Split the main saddle into two parts; S2: two parts of the main saddle are set up at intervals on the left and right sides of the top of the bridge tower, and a pushing device is provided; S3: constructing a catwalk, wherein two catwalks are arranged in parallel; S4: Main cable construction is performed, two main cables are arranged in parallel, and temporary buckling cables are set between the main beam and the main cables; S5: installing active cross braces between the parallel main cables, and using the active cross braces to open the parallel main cables and the catwalk to the designed position; S6: Then, the two parts of the main cable saddle are closed by using the pushing device to complete the merging of the main cable saddle and the conversion of the main cable from a plane system to a space system; S7: Install and tension the slings, and remove the temporary buckling cables and the catwalk.

[0007] Preferably, S2 further comprises: S21: Reaction platform brackets are fixedly connected at both ends of the top of the bridge tower; S22: fixing the two parts of the main saddle on the two reaction platform brackets; S23: The pushing device includes two groups of reaction seats and a jack, the two groups of reaction seats are respectively arranged on the outer sides of two parts of the main cable saddle, and the jack is arranged between the reaction seats and the main cable saddle.

[0008] Preferably, in S2, the main saddle and the pushing device are connected with a reaction platform bracket to form a saddle quick-install module, and two reaction platform brackets are provided, and a lap plate is connected between the tops of the two reaction platform brackets, and the two parts of the main saddle are relatively slidably arranged on the lap plate, and the pushing device is arranged between the lap plate and the main saddle.

[0009] Preferably, in the saddle quick-install module of S2, a linkage assembly is connected between the two parts of the main saddle, and the pushing device includes two groups of reaction seats and a group of jacks, the two groups of reaction seats are fixedly arranged on the lap plate and are respectively located on the outside of the two parts of the main saddle, the jack is located between one group of the reaction seats and one part of the main saddle, and a pad is pre-installed between the other reaction seat and the other part of the main saddle.

[0010] Preferably, the pushing process of the main cable saddle is as follows: the jack first pushes a part of the main cable saddle, stops after pushing for a certain distance, then adds a pad between the reaction seat on the other side of the jack and the main cable saddle, then the jack retreats, and continues to add a pad between the reaction seat and the main cable saddle on the same side of the jack. During this process, the pushing distance of the jack each time depends on the thickness of the pad.

[0011] Preferably, in the saddle quick-release module of S2, the linkage assembly between the two parts of the main saddle includes a gear and two racks, a cavity is opened inside the lap plate, the gear is rotatably arranged inside the lap plate, the two racks are parallel to each other and respectively meshed on both sides of the gear, and the two racks are respectively connected to the two parts of the main saddle.

[0012] Preferably, in the cable saddle quick-install module of S2, the gear is connected with an anti-reverse assembly.

[0013] Preferably, the anti-reversal assembly includes a ratchet and a pawl, both of which are arranged in the cavity of the lap plate, the ratchet is coaxially connected to the gear, the pawl is swingably arranged on one side of the ratchet and meshes with the ratchet, and the pawl is connected to a reset spring, which controls the pawl to automatically engage with the ratchet.

[0014] Preferably, in the cable saddle quick-release module of S2, the bottom of the gear is coaxially connected with a control shaft, the lower end of the control shaft is slidably connected with a sleeve, the sleeve is provided with an external thread, the bottom of the lap plate is provided with a first threaded hole, the external thread of the sleeve is threadedly connected with the first threaded hole of the lap plate, and the top of the bridge tower is provided with a second threaded hole at a position corresponding to the first threaded hole. When the two parts of the main cable saddle are closed, the gear drives the control shaft and the sleeve to rotate, and the sleeve is screwed downward under the action of the first threaded hole, and gradually screwed into the second threaded hole at the top of the bridge tower.

[0015] Preferably, a flared opening extending from inside to outside is provided between the inner sides of the bottoms of the two reaction platform brackets.

[0016] The beneficial effects of the present invention are: 1. Since the two parts of the main cable saddle are installed on the bridge tower at intervals, the split main cable saddle can form a larger installation distance after installation compared with the integrated main cable saddle, that is, the width of the main cable saddle is larger, and the parallel catwalks can be installed at a larger distance, thereby avoiding the problem of limited space and inconvenient operation; 2. In the method steps of the present invention, when the main cable is converted from a plane system to a space system, it is divided into two processes: the active cross brace is opened and the pushing device is pushed, so that part of the pressure of the active cross brace can be shared by the pushing device. Compared with the method of opening it into place once in the prior art, the present invention can avoid excessive concentration of pressure during the system conversion process, thereby further reducing the difficulty of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view of the suspension bridge in the first embodiment before the system conversion; Figure 2 is a top view of the suspension bridge in Example 1 before system conversion; Figure 3 is a top view of the main cable and catwalk of the suspension bridge after being cross-braced in the first embodiment; Figure 4 is a top view of the main cable saddle of the suspension bridge in the first embodiment after being closed; Figure 5 yes Figure 2 Side view of the main saddle at center A; Figure 6 yes Figure 4 Side view of the main saddle at B in the middle; Figure 7 is a side view of the main cable saddle in the second embodiment before closing; Figure 8 is a top view of the internal structure of the lap plate in the second embodiment; Fig. 9 is a side view of the internal structure of the lap plate in the second embodiment; Fig.10 yes Fig. 9 A partial enlarged view of point C in the middle.

[0018] Explanation of the reference numerals in the accompanying drawings: 11. bridge tower; 12. catwalk; 13. main cable; 14. temporary cable; 15. active cross brace; 16. main beam; 21. main cable saddle; 22. reaction platform bracket; 23. reaction seat; 24. jack; 25. pad; 26. lap plate; 31. gear; 32. rack; 41. ratchet; 42. pawl; 51. control shaft; 52. sleeve; 61. first threaded hole; 62. second threaded hole. DETAILED DESCRIPTION

[0019] The following will be combined Figure 1-Figure 10 The present invention is further illustrated by the following embodiments.

[0020] Embodiment 1 This embodiment discloses a method for installing the main cable of a space cable self-anchored suspension bridge by splitting and shifting the main cable saddle.

[0021] Reference Figures 1 to 6 The main cable installation method of a space cable self-anchored suspension bridge using the main cable saddle splitting and displacement includes the following steps: S1: Split the main saddle 21 into two parts; S2: two parts of the main saddle 21 are set up at intervals on the left and right sides of the top of the bridge tower 11, and a jacking device is set; S3: constructing the catwalk 12, with two catwalks 12 arranged in parallel; S4: construct the main cable 13, arrange the two main cables 13 in parallel, and set a temporary cable 14 between the main beam 16 and the main cable 13; S5: Install active cross braces 15 between the parallel main cables 13, and use the active cross braces 15 to open the parallel main cables 13 and the catwalk 12 to the designed position; S6: Then, the two parts of the main cable saddle 21 are closed by using the pushing device, so as to complete the merging of the main cable saddle 21 and the conversion of the main cable 13 from a plane system to a space system; S7: Install and tension the slings, and remove the temporary buckling cables 14 and the catwalk 12.

[0022] Through the above steps, since the two parts of the main cable saddle 21 are installed on the bridge tower 11 at intervals on the left and right, the split main cable saddle 21 can form a larger installation distance after installation compared with the integrated main cable saddle 21, that is, the width of the main cable saddle 21 is larger at this time, and a larger distance can be installed between the parallel catwalks 12, thereby avoiding the problem of limited space and inconvenient operation.

[0023] Furthermore, in the method steps of the present invention, when the main cable 13 is converted from a plane system to a space system, it is divided into two processes: the active cross brace 15 is stretched out and the pushing device is pushed out, so that part of the pressure of the active cross brace 15 can be shared by the pushing device. Compared with the method of stretching out into place at one time in the prior art, the present invention can avoid excessive concentration of pressure during the system conversion process, thereby further reducing the difficulty of construction.

[0024] In this embodiment, the specific installation process of the main cable saddle 21 is as follows: S21: reaction platform brackets 22 are fixedly connected to both ends of the top of the bridge tower 11; S22: The two parts of the main saddle 21 are fixedly mounted on the two reaction platform brackets 22; S23: The pushing device includes two groups of reaction seats 23 and a jack 24. The two groups of reaction seats 23 are respectively arranged on the outer sides of two parts of the main cable saddle 21, and the jack 24 is arranged between the reaction seats 23 and the main cable saddle 21.

[0025] Correspondingly, the specific pushing process of the main cable saddle 21 is as follows: The jacks 24 on both sides push synchronously, and after pushing for a certain distance, the main cable saddle 21 is temporarily fixed, and then the jacks 24 retreat and insert the pad 25 between the jacks 24 and the main cable saddle 21, and repeat the above actions until the main cable saddle 21 is completely closed. In this process, the distance that the jacks 24 push each time depends on the thickness of the pad 25.

[0026] It should be noted that in some embodiments, the expansion process of the active cross brace 15 and the pushing process of the pushing device are performed alternately, which can further improve the accuracy of the system conversion.

[0027] Embodiment 2 This embodiment also discloses a method for installing the main cable of a space cable self-anchored suspension bridge by splitting and shifting the main cable saddle.

[0028] Combination Figure 7-10 , which is different from the first embodiment, in S2, the main saddle 21, the reaction platform bracket 22 and the jacking device are modularly connected to form a saddle quick-install module. Specifically, two reaction platform brackets 22 are provided, and a lap plate 26 is connected between the tops of the two reaction platform brackets 22. The two parts of the main saddle 21 are relatively slidably arranged on the lap plate 26, and the jacking device is arranged between the lap plate 26 and the main saddle 21. By designing the main saddle 21, the reaction platform bracket 22 and the jacking device as a module in advance, it can be fixed after being hoisted on the bridge tower 11 at one time, without the need for multiple positioning on the bridge tower 11, thereby reducing the difficulty of hoisting the main saddle 21. Furthermore, an expansion opening from the inside to the outside is opened between the inner sides of the bottom of the two reaction platform brackets 22 to facilitate the connection between the reaction platform bracket 22 and the bridge tower 11.

[0029] In the cable saddle quick-installation module of S2, a linkage assembly is connected between the two parts of the main cable saddle 21. Correspondingly, the jacking device includes two groups of reaction seats 23 and a group of jacks 24. The two groups of reaction seats 23 are fixedly arranged on the lap plate 26 and are respectively located outside the two parts of the main cable saddle 21. The jack 24 is located between one group of reaction seats 23 and one part of the main cable saddle 21, and a pad 25 is pre-installed between the other reaction seat 23 and the other part of the main cable saddle 21. In some embodiments, the reaction seat 23 on the other side of the jack 24 directly abuts against the main cable saddle 21. Through the above arrangement, since the two parts of the main cable saddle 21 are linked, only one group of jacks 24 is needed to realize the closing of the two parts of the main cable saddle 21, reducing the arrangement of the driving parts, thereby reducing the risk of damage to the driving parts, and there is no need to consider the synchronization of the two groups of jacks 24 during the jacking process, thereby reducing the control complexity during the jacking process.

[0030] Based on the linkage assembly and the pushing device of this embodiment, the pushing process of the main cable saddle 21 is as follows: The jack 24 first pushes a part of the main cable saddle 21, stops after pushing for a certain distance, and then adds a pad 25 between the reaction seat 23 on the other side of the jack 24 and the main cable saddle 21, then the jack 24 retreats, and continues to add a pad 25 between the reaction seat 23 on the same side of the jack 24 and the main cable saddle 21, repeating the above actions until the main cable saddle 21 is completely closed. In this process, it is not necessary to temporarily fix the main cable saddle 21 after each push, so compared with the first embodiment, it has the effect of improving the closing efficiency of the main cable saddle 21. Similarly, in this process, the distance that the jack 24 pushes each time depends on the thickness of the pad 25.

[0031] In the saddle quick-install module of S2, the linkage assembly between the two parts of the main saddle 21 includes a gear 31 and two racks 32. A cavity is opened inside the lap plate 26. The gear 31 is rotatably arranged inside the lap plate 26. The two racks 32 are parallel to each other and respectively meshed on both sides of the gear 31. The two racks 32 are respectively connected to the two parts of the main saddle 21, so that when one part of the main saddle 21 is pushed, the other part of the main saddle 21 will be pushed through the gear 31 and the rack 32 to achieve linkage.

[0032] In the cable saddle quick-installation module of S2, the gear 31 is also connected to an anti-reversal component. The purpose of setting the anti-reversal component is that if the jack 24 fails, the anti-reversal component can prevent the two parts of the main cable saddle 21 from returning outwards, thereby improving stability. Specifically, the anti-reversal component includes a ratchet 41 and a pawl 42, both of which are arranged in the cavity of the lap plate 26, wherein the ratchet 41 is coaxially connected to the gear 31, the pawl 42 is swingably arranged on one side of the ratchet 41 and meshes with the ratchet 41, and the pawl 42 is connected to a reset spring, which controls the pawl 42 to automatically mesh with the ratchet 41.

[0033] In the saddle quick-release module of S2, the bottom of the gear 31 is coaxially connected to the control shaft 51, and the lower end of the control shaft 51 is slidably connected to the sleeve 52, the sleeve 52 is provided with an external thread, and the bottom of the lap plate 26 is provided with a first threaded hole 61, and the external thread of the sleeve 52 is threadedly connected to the first threaded hole 61 of the lap plate 26. Furthermore, a second threaded hole 62 is opened at the top of the bridge tower 11 at a position corresponding to the first threaded hole 61. When the two parts of the main saddle 21 are closed, the gear 31 drives the control shaft 51 and the sleeve 52 to rotate, and the sleeve 52 is screwed downward under the action of the first threaded hole 61 until it is screwed into the second threaded hole 62 at the top of the bridge tower 11. At this time, the external thread of the sleeve 52 is simultaneously connected to the first threaded hole 61 of the lap plate 26 and the second threaded hole 62 at the top of the bridge tower 11. Therefore, the secondary connection between the lap plate 26 and the top of the bridge tower 11 can be realized, so that the connection stability between the saddle quick-release module and the top of the bridge tower 11 can be improved as the main saddle 21 is closed.

[0034] The above are all preferred embodiments of the present invention, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for erecting the main cable of a space cable self-anchored suspension bridge by splitting and shifting the main cable saddle, characterized in that: The following steps are involved: S1: Split the main saddle (21) into two parts; S2: two parts of the main saddle (21) are installed on the top of the bridge tower (11) at intervals on the left and right, and a pushing device is provided; S3: constructing a catwalk (12), wherein two catwalks (12) are arranged in parallel; S4: constructing the main cables (13), arranging the two main cables (13) in parallel, and setting temporary tie cables (14) between the main beam (16) and the main cables (13); S5: installing an active cross brace (15) between the parallel main cables (13), and using the active cross brace (15) to open the parallel main cables (13) and the catwalk (12) to a designed position; S6: Then, the two parts of the main cable saddle (21) are closed by using the pushing device, so as to complete the merging of the main cable saddle (21) and the conversion of the main cable (13) from a plane system to a space system; S7: Install and tension the slings, and remove the temporary buckle cables (14) and the catwalk (12).

2. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 1 is characterized in that: S2 also includes: S21: Reaction platform brackets (22) are fixedly connected to both ends of the top of the bridge tower (11); S22: fixing the two parts of the main cable saddle (21) on the two reaction platform brackets (22); S23: The pushing device comprises two groups of reaction seats (23) and a jack (24), wherein the two groups of reaction seats (23) are respectively arranged on the outer sides of two parts of the main cable saddle (21), and the jack (24) is arranged between the reaction seats (23) and the main cable saddle (21).

3. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 1 is characterized in that: In S2, the main saddle (21) and the pushing device are connected with a reaction platform bracket (22) to form a saddle quick-install module, and two reaction platform brackets (22) are provided, and a lap plate (26) is connected between the tops of the two reaction platform brackets (22). The two parts of the main saddle (21) are relatively slidably arranged on the lap plate (26), and the pushing device is arranged between the lap plate (26) and the main saddle (21).

4. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 3 is characterized in that: In the cable saddle quick-installation module of S2, a linkage assembly is connected between the two parts of the main cable saddle (21), and the pushing device includes two groups of reaction seats (23) and a group of jacks (24). The two groups of reaction seats (23) are fixedly arranged on the lap plate (26) and are respectively located on the outside of the two parts of the main cable saddle (21). The jack (24) is located between one group of the reaction seats (23) and one part of the main cable saddle (21), and a pad (25) is pre-installed between the other reaction seat (23) and the other part of the main cable saddle (21).

5. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 4 is characterized in that: The pushing process of the main cable saddle (21) is as follows: the jack (24) first pushes a part of the main cable saddle (21), stops after pushing for a certain distance, and then adds a pad (25) between the reaction seat (23) on the other side of the jack (24) and the main cable saddle (21), then the jack (24) retreats, and continues to add the pad (25) between the reaction seat (23) on the same side of the jack (24) and the main cable saddle (21). In this process, the pushing distance of the jack (24) each time depends on the thickness of the pad (25).

6. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 5 is characterized in that: In the saddle quick-installation module of S2, the linkage assembly between the two parts of the main saddle (21) includes a gear (31) and two racks (32), a cavity is opened inside the lap plate (26), the gear (31) is rotatably arranged inside the lap plate (26), the two racks (32) are parallel to each other and respectively meshed on both sides of the gear (31), and the two racks (32) are respectively connected to the two parts of the main saddle (21).

7. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 6 is characterized in that: In the cable saddle quick-installation module of S2, the gear (31) is connected to an anti-reverse assembly.

8. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 7 is characterized in that: The anti-reversal assembly comprises a ratchet (41) and a pawl (42), wherein the ratchet (41) and the pawl (42) are both arranged in the cavity of the lap plate (26), the ratchet (41) is coaxially connected to the gear (31), the pawl (42) is swingably arranged on one side of the ratchet (41) and meshes with the ratchet (41), and the pawl (42) is connected to a reset spring, and the reset spring controls the pawl (42) to automatically mesh with the ratchet (41).

9. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 8 is characterized in that: In the cable saddle quick-install module of S2, the bottom of the gear (31) is coaxially connected with a control shaft (51), the lower end of the control shaft (51) is slidably connected with a sleeve (52), the sleeve (52) is provided with an external thread, the bottom of the lap plate (26) is provided with a first threaded hole (61), the external thread of the sleeve (52) is threadedly connected with the first threaded hole (61) of the lap plate (26), and the top of the bridge tower (11) is provided with a second threaded hole (62) at a position corresponding to the first threaded hole (61). When the two parts of the main cable saddle (21) are closed, the gear (31) drives the control shaft (51) and the sleeve (52) to rotate, and the sleeve (52) is screwed downward under the action of the first threaded hole (61) and gradually screwed into the second threaded hole (62) at the top of the bridge tower (11).

10. The main cable installation method of a space cable self-anchored suspension bridge using the splitting and displacement of the main cable saddle according to claim 3 is characterized in that: An opening is provided between the inner sides of the bottoms of the two reaction platform brackets (22) and is expanded from the inside to the outside.

Images