Swing and shifting construction method for side span girder of suspension bridge

Abstract

The invention relates to the technical field of bridge construction, in particular to a swinging and shifting construction method for a side span girder of a suspension bridge, which comprises the following steps of: constructing a cable tower and a cable crane of the suspension bridge; conveying the beam section to a conveying point; a clamp connected with a cable loading crane, a first traction device on the side span side and a second traction device on the middle span side is fixed to the beam section; the cable loading crane, the first traction device and the second traction device are controlled to be matched with one another, so that the beam section swings to the side span construction position from the conveying point; wherein the conveying point and the side span construction position are arranged on the two sides of a horizontal plane projection point of the cable crane respectively. Through cooperation of the cable loading crane and the first traction device on the side span side and the second traction device on the middle span side, large-angle swing shifting of the beam section from the conveying point to the side span construction position is achieved, and the large-angle safe swing shifting device has the advantages that large-angle safe swing shifting is achieved, and the construction cost can be controlled.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and more specifically to a swing-shifting construction method for the main girder of a side span of a suspension bridge. Background Technology

[0002] A suspension bridge is a bridge whose superstructure consists primarily of cables suspended from towers and anchored to both banks. Following the construction sequence, after the towers and main cables are completed, the main girder is constructed, relying on the towers and main cables. The construction of the main girder varies depending on the structural form, terrain, and transportation conditions, and includes, but is not limited to, methods such as floating crane hoisting, support sliding, cable-mounted crane vertical lifting, cable-mounted crane swinging installation, hydraulic lifting station vertical lifting, hydraulic lifting station swinging installation, and jacking.

[0003] Existing technologies using the swing-swing method to construct main beams can reduce infrastructure investment and improve construction efficiency. However, the swing-swing method has the following limitations: when the water along the shore is shallow or the water cover is shallow, transport vessels cannot get too close to the shore, or the construction platform erected along the shore needs a stable installation foundation. Since the safe swing angle of the swing rope is 10°-15°, attempting a large-angle swing would pose a safety risk. Erecting a stable support structure to meet the safe swing angle of the swing rope would increase the cost of support structure construction and extend the construction period. Therefore, existing technologies present a technical problem in the swing-swing construction of the main beam of a suspension bridge's side span, where it is impossible to simultaneously ensure safe large-angle swinging and control construction costs. Summary of the Invention

[0004] This application addresses the shortcomings of existing methods by proposing a swing-shifting construction method for the main girder of a suspension bridge's side span, thereby solving the technical problem that related technologies cannot simultaneously ensure safe swing-shifting at large angles and control construction costs.

[0005] This application provides a method for the swing-shifting construction of the main girder of a suspension bridge side span, including: Complete the construction of the suspension bridge's towers and cable-mounted cranes; Transport the beam segments to the transport point; The clamps, which are connected to the cable-driven crane, the first traction device on the side span, and the second traction device on the middle span, are fixed to the beam segment; The cable-mounted crane, the first traction device, and the second traction device are controlled to cooperate with each other so that the beam segment is moved from the transport point to the side span construction site; The transport point and the side span construction site are located on both sides of the horizontal projection point of the cable-mounted crane.

[0006] Specifically, the main technical concept of this application is to achieve large-angle swinging of the beam segment from the transport point to the construction site of the side span by coordinating the first traction device on the side span side and the second traction device on the middle span side with the cable-mounted crane. This allows the application to avoid investing in additional infrastructure construction and reinforcing the receiving platform at the side span construction site, while also improving the construction safety of large-angle swinging. Thus, this application has the advantages of balancing safe large-angle swinging and controlling construction costs, and can support the large-angle swinging construction of the main beam of the side span of a suspension bridge under limited conditions.

[0007] Furthermore, at the delivery point, including: Control the first traction device to be in a state without traction force; Control the second traction device to apply traction force toward the mid-span direction; The cable-mounted crane is controlled to apply an upward traction force and simultaneously reel in the cable, so that the beam segment leaves the transport point at a first included angle; Wherein, the first included angle refers to the angle formed by the line connecting the cable-mounted crane and the projection point and the line connecting the cable-mounted crane and the transport point.

[0008] Furthermore, the area between the transport point and the projection point includes: Control the first traction device to be in a state without traction force; Maintain the upward traction force applied by the cable-mounted crane; The traction force applied by the second traction device is gradually reduced and the cable is released synchronously, so that the beam segment swings from the transport point to the projection point.

[0009] Furthermore, the area between the projection point and the side span construction location includes: Control the second traction device to be in a state without traction force; Continue to maintain the upward traction force applied by the cable-mounted crane; Control the first traction device to apply traction force toward the side span direction and simultaneously reel in the cable, so that the beam segment swings toward the side span construction site at a second included angle and reaches the side span construction site; The second included angle refers to the angle between the line connecting the cable-mounted crane and the projection point and the line connecting the cable-mounted crane and the side span construction site.

[0010] Specifically, another technical concept of this application is to set the construction status of the cable-mounted crane, the first traction device and the second traction device at each node and intermediate process of the transport point, projection point and side span construction site, thereby ensuring the orderly progress of large-angle construction and improving the safety of large-angle swing construction.

[0011] Furthermore, at the construction site of the side span, it also includes: The beam segment is received by a slide block, and the slide block is slidably connected to the placement platform for splicing multiple sets of the beam segment after they have been received.

[0012] Specifically, another technical concept of this application is that by sliding the sliding block and the beam segment, this application can receive modular steel truss beams, which can be used in the construction of large steel truss main beams, thereby improving the applicability of this application.

[0013] In some embodiments, at the delivery point, the following are also included: Before controlling the cable-mounted crane to retract the cable, maintain the upward traction force applied by the cable-mounted crane so that the beam segment remains stationary at a preset height for a period of time to verify the reliability of the clamp.

[0014] In some embodiments, the projection point includes: Maintain the upward traction force applied by the cable-mounted crane to bring the beam segment to a static position; The cable-mounted crane is controlled to apply an upward traction force and simultaneously reel in the cable, thereby lifting the beam segment upward to accommodate the receiving height at the side span construction site.

[0015] Furthermore, the swing-shifting construction method for the main girder of a side span of a suspension bridge provided in this application also includes: The traction height of the first traction device is adjusted by a lifting device set on the side of the span, which is used to adjust the receiving state of the beam segment.

[0016] In some embodiments, after the clamp is fixed to the beam segment, it includes: Adjust the center of gravity of the clamp so that it coincides with the center of gravity of the beam segment.

[0017] In some embodiments, the swing-shifting construction method for the main girder of a side span of a suspension bridge provided in this application further includes: The cable tower is used to install traction equipment for the first traction device and the second traction device; The first traction device and the second traction device's anti-pull node are installed through the load-bearing cable of the cable-mounted crane.

[0018] The beneficial technical effects of the technical solutions provided in this application include: During the main girder swinging process, relying on the suspension bridge's own tower structure, a traction system is constructed, including a cable-mounted crane, a first traction device, and a second traction device. This system connects the lifting side of the girder segment's clamps to the cable-mounted crane, the side span side to the first traction device, and the mid-span side to the second traction device. Simultaneously, this application utilizes the coordination of the cable-mounted crane, the first traction device, and the second traction device to achieve the swinging of the girder segment from the transport point to the side span construction site. Since the horizontal projection point of the cable-mounted crane is positioned between the transport point and the side span construction site, the swinging angle from the transport point to the projection point and the swinging angle from the projection point to the side span construction site can be superimposed, thus achieving a large-angle safe swinging of the main girder. Therefore, this application not only achieves a large-angle safe swinging of the main girder but also reduces construction investment and shortens the construction period based on the large-angle swinging of the main girder, thus possessing the advantages of balancing large-angle safe swinging and controlling construction costs.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 A schematic flowchart illustrating a method for the swaying construction of the main girder of a suspension bridge side span, provided in an embodiment of this application; Figure 2 A construction schematic diagram of the swing-shifting construction method for the main girder of a side span of a suspension bridge provided in the embodiments of this application; Figure 3 Provided for the embodiments of this application Figure 2 Enlarged view of point A in the middle; Figure 4 Provided for the embodiments of this application Figure 2 Enlarged view of point B in the middle; Figure 5 Provided for the embodiments of this application Figure 2 Enlarged view of point C in the middle; Figure 6 Provided for the embodiments of this application Figure 2 Enlarged view of point D in the middle; Figure 7 Provided for the embodiments of this application Figure 2 Enlarged view of point E in the middle; Figure 8 Provided for the embodiments of this application Figure 2 Enlarged view of point F in the middle; Figure 9 A schematic diagram of the construction process for the swinging construction of the main girder of a suspension bridge side span, provided in an embodiment of this application; Figure label: 1. Clamp; 2. Cable-mounted crane; 3. First traction device; 4. Second traction device; 5. Receiving platform; 6. Transport platform; 7. Tower; 8. Anchorage; 9. Load-bearing cable; 10. Beam segment; 11. Clamping plate; 12. Clamp; 13. Hydraulic assembly; 21. Lifting rope; 31. Swinging rope; 32. First winch; 33. Third reversing component; 34. Column; 35. Tensioning rope; 36. Lifting rope; 41. 42. Reverse rope; 51. Second winch; 52. Support; 71. Tower; 371. First buckle; 372. First base; 373. First pulley; 374. First wheel assembly; 375. First hook; 431. Reversing pulley assembly; 432. Positioning component; 433. Second wheel assembly; 434. Second hook; 431a. Second buckle; 431b. Second base; 431c. Second pulley. Detailed Implementation

[0021] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0022] Those skilled in the art will understand that, unless specifically stated otherwise, the terms "described" and "the" as used herein may also include plural forms. It should be further understood that the term "comprising" as used in the specification of this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by this art. The term "and / or" as used herein refers to at least one of the items defined by the term; for example, "A and / or B" can be implemented as "A," or as "B," or as "A and B."

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0024] This application mainly relates to a swinging construction method for the main girder of a suspension bridge's side span. Through the cooperation of a cable-mounted crane, a first traction device, and a second traction device, a large-angle safe swinging movement of the girder segment is achieved from the transport point to the side span construction site. Therefore, this application combines the advantages of large-angle safe swinging movement for the main girder of a suspension bridge's side span with cost control, and can be used for swinging construction of the main girder of a suspension bridge's side span under limited conditions.

[0025] The research and development concept of this application includes: relying on the structure of the suspension bridge itself, such as the towers and suspension cables, to construct a traction system consisting of a cable-mounted crane, a first traction device, and a second traction device. This reduces the dependence of this application on the construction environment, making it applicable to most scenarios of suspension bridge main girder construction. Simultaneously, this application also uses clamps to allow the cable-mounted crane, the first traction device, and the second traction device to jointly traction the beam segment. This allows the cable-mounted crane above the beam segment to lift it, the first traction device on the side span to traction the beam segment towards the side span, and the second traction device on the middle span to traction the beam segment towards the middle span. Through the cooperation of these three components, a large-angle traction of the beam segment is achieved from the transport point to the horizontal projection point of the cable-mounted crane, and then to the side span construction site. Because the traction process of the beam segment is jointly controlled by the cable-mounted crane, the first traction device, and the second traction device, both the safety of large-angle traction and the construction efficiency of the suspension bridge side span main girder swinging construction can be ensured.

[0026] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.

[0027] Optionally, for a detailed explanation of the swing-shifting construction method for the main girder of a suspension bridge side span provided in this application, please refer to... Figure 2 This document provides a construction schematic diagram of a traction system for swinging construction of the main girder of a suspension bridge side span, as provided in one embodiment of this application. It also describes the apparatus and equipment used in the swinging construction method for the main girder of a suspension bridge side span provided in this application. Figure 2 The arrow direction is used to indicate the swing direction of beam segment 10. In some construction scenarios, the water near the shore is shallow, preventing transport vessels from getting too close, or the construction foundation on the shore is poor, making it impossible to erect supports 51 near the shore. This presents the following problems: if the traditional swing construction method is still used to swing beam segment 10, either the construction risks of large-angle swing are ignored, posing potential construction safety hazards; or the shore foundation needs to be reinforced, resulting in increased construction costs and extended construction period. In other words, in the above application scenarios, the swing construction method faces the dilemma of not being able to simultaneously ensure construction safety and large-angle swing.

[0028] The swaying construction traction system provided in this application includes: a clamp 1, a cable-mounted crane 2, a first traction device 3, a second traction device 4, a receiving platform 5, and a transport platform 6. The clamp 1 is used for clamping the beam crane and for lifting by the hoisting equipment. The hoisting equipment includes: the cable-mounted crane 2, the first traction device 3, and the second traction device 4. The cable-mounted crane 2 provides the lifting force via the lifting rope 1 connected to the lifting point of the clamp 1; the first traction device 3 provides the force towards the side span via the swaying rope 31 connected to the lifting point of the clamp 1 towards the side span; and the second traction device 4 provides the force away from the side span via the counter-tension rope 41 connected to the lifting point of the clamp 1 towards the middle span. It is understood that the clamp 1 is configured as a lifting device. Side span and middle span are common technical terms in bridge engineering. A side span refers to the end span of a multi-span bridge; a middle span refers to the span between the side spans of a multi-span bridge. In a suspension bridge, the side span refers to the span between anchorage 8 and tower 7, while the middle span refers to the span between two towers 7. The receiving platform 5 is located at the construction site of the side span and is configured as the endpoint of the swing of beam segment 10. The transport platform 6 is located at a designated transport point in the water, which is the starting point of the swing of beam segment 10. Simultaneously, the towers 7, anchorage 8, the load-bearing ropes between towers 7 and anchorage 8, and the load-bearing ropes between towers 7 have already been completed during the construction of the suspension bridge itself. Tower 7 refers to the tower-shaped structure that supports the main cables of the suspension bridge; anchorage 8 refers to the structure that fixes the main cables and transmits loads towards the foundation; and load-bearing rope 9 refers to the main cables of the suspension bridge or the traction cables used for the main cable erection. In other words, tower 7, anchorage 8, and load-bearing ropes are all essential basic structures for a suspension bridge and do not require additional construction. This application reduces infrastructure investment costs and enhances its applicability by reusing the existing foundation structure of suspension bridges. Furthermore, besides being used for large-angle swing construction of suspension bridge main girders, this application can also be applied to other road and bridge construction scenarios requiring large-angle swing of beam segments 10.

[0029] Clamp 1 includes: clamping plate 11, chuck 12, and hydraulic assembly 13. (See reference...) Figure 3 for Figure 2 An enlarged schematic diagram at point A. Clamping plates 11 are connected to both the hoisting equipment and beam segment 10, respectively, for load transfer between the two; chucks 12 are slidably connected to clamping plates 11 for connecting the hoisting equipment; a hydraulic assembly 13 is disposed on clamping plates 11, with its transmission end connected to chucks 12, for adjusting the installation position of chucks 12 relative to clamping plates 11. It can be understood that beam segment 10 refers to one or more assembly units of the main beam. That is, this application can either swing the main beam as a whole or swing a portion of the main beam before assembling it, making this application applicable to the segmented swinging of large main beams.

[0030] The clamping plate 11 is welded from steel plates that conform to national or industry standards for lifting tools. The clamping plate 11 is equipped with clamping parts for securing the beam segment 10. Understandably, the style of the clamping plate 11 can be adjusted according to the beam segment 10.

[0031] The clamp 12 includes a lifting section and a sliding section. The sliding section is connected to the clamp plate 11 via a sliding connection, and the lifting section is connected to the middle of the sliding section via a rotating connection. This allows the lifting section to adaptively adjust its posture during lifting, avoiding rigid shearing caused by multiple forces. Simultaneously, a lifting point is provided in the middle of the lifting section, which is used to simultaneously connect the lifting rope 21 of the cable crane 2, the first traction device 3 and the swing rope 31, and the counter-pull rope 41 of the second traction device 4.

[0032] The hydraulic assembly 13 adjusts the position of the clamp 12 relative to the clamping plate 11, thereby balancing the center of gravity of the clamp 1 and the beam segment 10, and improving the stability of the clamp 12 under the traction forces from the cable-driven crane 2, the first traction device 3, and the second traction device 4. It is understood that the hydraulic assembly 13 includes pneumatic jacks, hydraulic jacks, etc.

[0033] The cable-mounted crane 2 includes a lifting rope 21. The cable-mounted crane 2 refers to a lifting device that can travel along the load-bearing cable, and can be understood with reference to existing cable-mounted cranes 2. The load-bearing cable can reuse the existing load-bearing cable 9 of the suspension bridge; that is, the cable-mounted crane 2 is slidably connected to the load-bearing cable 9. One end of the lifting rope 21 of the cable-mounted crane 2 is connected to the cable-mounted crane 2, and the other end is used to connect to the clamp 12. The cable-mounted crane 2 lifts the clamp 12 by winding up the rope and relaxes the clamp 12 by unwinding the rope. The cable-mounted crane 2 of this application is located between the receiving platform 5 and the transport platform 6, and is used to provide the midpoint for lifting the beam segment 10, realizing the swing of the beam segment 10 at two swing angles.

[0034] The first traction device 3 includes: a swing rope 31, a first winch 32, a third reversing component 33, a column 34, a tension rope 35, a lifting rope 36, and the first reversing component. (See reference...) Figure 3 , 5 6 and 7 Figure 5 for Figure 2 Enlarged diagram of point C in the middle. Figure 6 for Figure 2 Enlarged diagram at point D in the middle. Figure 7 for Figure 2Enlarged schematic diagram at point E. The first winch 32 is located at the top of the temporary anchor tower 71 erected on the pylon 7, providing traction output; the third reversing member 33 is located at the bottom of the anchor tower 71, used to change the direction of the swing rope 31 from the top to the bottom of the tower; the column 34 is located at the bottom of the pylon 7 to provide installation for the tension rope 35 and the lifting rope 36; the tension rope 35 is used to tension the swing rope 31 segment between the clamp 1 and the column 34; the lifting rope 36 is used to lift the swing rope 31 segment between the clamp 1 and the column 34, so that the height of this swing rope 31 segment meets the height required to place the beam segment 10 on the receiving platform 5; the first reversing member is located between the load-bearing cable 9 from the pylon 7 to the side span anchorage 8 and the clamp 1, used to change the direction of the swing rope 31 from the side span towards the transport platform 6. It can be understood that the anchor tower 71 refers to a temporary construction platform commonly found in suspension bridge construction, formed by connecting steel components.

[0035] The swaying rope 31, tensioning rope 35, and lifting rope 36 are all ropes used for traction, such as common single-strand steel wire ropes and multi-strand steel wire ropes.

[0036] The first winch 32 is a small, lightweight lifting device that uses a drum to wind steel wire rope or chain to lift or pull heavy objects.

[0037] The third reversing member 33 includes a base and a pulley mounted on and rotatable along the base. The base is fixed to the tower 71 by welding or bolting and is positioned in the winch direction of the first winch 32, so that the swaying rope 31, one end of which is connected to the first winch 32, changes the direction of force transmission from the first winch 32 through the pulley. Specifically, the third reversing member 33 is used to reverse the direction of the swaying rope 31 from the top of the tower 7 towards the middle of the load-bearing cable 9 between the tower 7 and the anchor 8, so that the swaying rope 31 passes through the third reversing member 33 and then through the first reversing member located in the middle of the load-bearing cable 9. It is understood that the base is a metal load-bearing structure with an installation interface for fixing to the attachment. The pulley is rotatably connected to a rotating cavity defined by the base via a central shaft, allowing the pulley to rotate within the rotating cavity. The outer circumference of the pulley has a cable groove for accommodating the rope, allowing the rope to change direction after passing through the cable groove.

[0038] The first reversing component includes: a first buckle 371, a first base 372, a first pulley 373, a first wheel assembly 374, and a first hook 375. The first buckle 371 is used to fasten to the outer periphery of the load-bearing cable 9 via a buckle structure; the first base 372 is connected to the first buckle 371; the first pulley 373 is rotatably connected to the first base 372. The first buckle 371, the first base 372, and the first pulley 373 are used to guide the swaying rope 31, which passes through the first pulley 373, toward the column 34. The first wheel assembly 374 is used to form a double-strand traction structure for the swaying rope 31; the first hook 375 is connected to the first wheel assembly 374 and includes a hook for connecting the rope, the hook for connecting the clamp 12, so that the swaying rope 31 provides a component force toward the side span to the beam segment 10 through the first hook 375 and the clamp 12.

[0039] The first clip 371 can be configured as an anti-slip strip wrapped around the cable clamp and a steel wire rope wrapped around the anti-slip strip, thereby fixing the first base 372 with the steel wire rope. It is understood that the cable clamp is a key load-bearing component of the superstructure of a suspension bridge, mainly used to clamp the main cable and connect the main cable to the suspenders. That is, the first clip 371 can be based on the cable clamp to improve the convenience of installing the first reverse component. Of course, the first clip 371 can also be configured as a cable clamp structure or other structures that can be used to fix it to the load-bearing cable 9. Specifically, the first clip 371 is located in the middle of the side span section of the load-bearing cable 9 between the tower 7 and the anchorage 8.

[0040] The first pulley group 374 includes pulley components respectively positioned near the column 34 and near the clamp 1, so that the swing rope 31 forms a double-strand rope from the column 34 to the clamp 1, thereby improving the pulling efficiency and reliability through multi-line pulling. It is understood that the first pulley group 374 can also be equipped with multiple pulley components between the column 34 and the clamp 1, so that the swing rope 31 forms multiple strands; no further restrictions are imposed here.

[0041] A support column 34 is positioned at the end of the receiving platform 5 away from the transport platform 6, and is used to bear loads via the foundation or the receiving platform 5. It is understood that one end of a tension rope 35 is connected to the middle of the support column 34, and the other end of the tension rope 35 is connected to a pulley component of the first wheel assembly 374 near the support column 34. This allows the first wheel assembly 374 to be tensioned by the tension rope 35, ensuring that the height of the swaying rope 31 between the first wheel assemblies 374 is consistent with the height of the tension rope 35. In other words, the height of the tension rope 35 is used to confirm the receiving height of the beam segment 10. One end of a lifting rope 36 is also connected to the top of the support column 34, and the other end of the lifting rope 36 is connected to the middle of the tension rope 35. This allows for fine-tuning of the height of the tension rope 35, thereby enabling fine-tuning of the receiving height of the beam segment 10, facilitating the receiving platform 5's reception of the beam segment 10.

[0042] Therefore, the working principle of the first traction device 3 is as follows: the first winch 32 located at the top of the tower 7 provides the traction force for the swing rope 31. After the swing rope 31 passes through the third reversing member 33 and the first reversing member in sequence, it can generate a horizontal component force from the transport platform 6 toward the receiving platform 5, thereby realizing the receiving platform 5 receiving the beam segment 10. At the same time, the tension rope 35 on the column 34 is used to determine the receiving height of the beam segment 10, and the lifting rope 36 is used to fine-tune the receiving height of the beam segment 10, thereby reducing the difficulty of receiving the beam segment 10.

[0043] The second traction device 4 includes: a reverse rope 41, a second winch 42, and a second reversing component. (See reference...) Figure 3 , 4 and 7, Figure 4 for Figure 2 Enlarged schematic diagram at point B. The reverse pull rope 41 is configured as a traction rope; the second winch 42 is located at the top of the tower 71 to provide traction output; the second reversing member is located between the load-bearing cable 9 and the transport platform 6 between the towers 7 to change the direction of the reverse pull rope 41 from the tower 7 towards the transport platform 6.

[0044] The second reversing component includes: a reversing pulley component 431, a positioning component 432, a second wheel assembly 433, and a second hook 434. The reversing pulley component is used to change the direction of the pullback rope 41; the positioning component 432 and the second wheel assembly 433 are used to form a double-strand structure for the pullback rope 41 between the load-bearing cable 9 and the clamp 1. The second hook 434 is connected to the second wheel assembly 433 and includes a hook for connecting the rope. The hook is used to connect the clamp 12, so that the pullback rope 41 provides a component force against the side span to the beam segment 10 through the first hook 375 and the clamp 12.

[0045] The reversing pulley component 431 includes: a second buckle 431a, a second base 431b, and a second pulley 431c. The second buckle 431a is used to fasten to the outer periphery of the load-bearing cable 9 via a buckle structure. The second base 431b is connected to the second buckle 431a, and the second pulley 431c is rotatably connected to the second base 431b. The second buckle 431a, the second base 431b, and the second pulley 431c are used to direct the reverse pull rope 41 passing through the second pulley 431c toward the conveying platform 6.

[0046] The positioning component 432 is connected to the load-bearing cable 9 by a snap fastener and is used to provide the installation positioning of the reverse tension rope 41, thereby cooperating with the second wheel group 433 to form a double-strand reverse tension structure.

[0047] It is understood that both the second buckle 431a and the positioning element 432 are located in the middle of the mid-span of the load-bearing cable 9 between the two towers (another tower is not shown). The second buckle 431a is located near the side span.

[0048] Therefore, the working principle of the second traction device 4 is as follows: the second winch 42 located at the top of the tower 7 provides the traction force for the reverse rope 41. After the reverse rope 41 is reversed by the second reversing member, it can generate a component force from the transport platform 6 toward the reverse rope 41. At the same time, the second wheel set 433, together with the positioning member 432, forms a double-strand reverse traction structure to improve the reliability and efficiency of the reverse traction.

[0049] The receiving platform 5 includes a base 52, a bracket 51, and a placement seat (not shown in the figure). Please refer to... Figure 8 for Figure 2 Enlarged schematic diagram at point F. The base 52 is configured as a support structure erected at the bottom of the cable tower 7; the bracket 51 is set on the base 52 to provide a working platform; the placement seat is slidably connected to the bracket 51 for receiving the beam segment 10 and for transferring the received beam segment 10, thereby realizing the splicing of the beam segment 10 on the receiving platform 5 and improving the applicability of this application to large modular beam segments 10.

[0050] The transport platform 6 is configured as a transport ship, a shuttle ship, or other platform that can provide beam segments 10 on water.

[0051] Combination Figure 2-8 Please refer to Figure 1 The diagram shown is a schematic flowchart of a method for swinging construction of the main girder of a suspension bridge side span, provided in an embodiment of this application.

[0052] The method for swinging construction of the main girder of the side span of a suspension bridge provided in this application includes the following steps: Before the swinging construction of beam segment 10, the construction of the suspension bridge's tower 7 and cable-mounted crane 2 is completed first. Tower 7 can be constructed through cast-in-place construction or splicing. After tower 7 is completed, a temporary anchor tower 71 is installed on top of tower 7, and a traction system for the suspension bridge deck construction is established through the anchor tower 71. Then, the traction system is used to pull various cables of tower 7, including but not limited to: catwalk cables, handrail cables, and main cables. Finally, cable-mounted crane 2 is installed along the main cable, allowing it to move along the main cable. Simultaneously, before the swinging construction, cable-mounted crane 2 is pre-moved to the midpoint between the transport point and the side span construction area, ensuring that the horizontal projection point of cable-mounted crane 2 is approximately at the midpoint between the transport point and the side span construction area, facilitating the pre-determination of the first and second swinging angles. It is understood that the construction of Tower 7, the traction system, and various cables, as well as the definitions of catwalk cables, handrail cables, main cables, etc., can all be understood with reference to existing technologies, and this application does not impose any excessive restrictions.

[0053] Then, the traction equipment for the first traction device 3 and the second traction device 4 is set up through the cable tower 7; the anti-pull nodes of the first traction device 3 and the second traction device 4 are installed through the carrying cable of the cable crane 2, including: The first winch 32 is installed at the top of the tower 71; the third reversing member 33 is installed at the bottom of the tower 71 near the winch direction of the first winch 32; the first reversing member is installed through the installation space formed by the load-bearing cable 9, the column 34 and the clamp 1. The installation of the first reversing member includes: installing the first buckle 371 through the load-bearing cable 9, installing the first base 372 and the first pulley 373 through the first buckle 371; installing the column 34 at the side span construction site, and installing the tension rope 35 and the lifting rope 36 on the column 34. Meanwhile, one end of the swaying rope 31 is connected to the first winch 32, and the other end passes through the third reversing member 33 and the first pulley 373 in sequence. After being reversed, the tensioning rope 35 tensions the pulley members of the first wheel group 374 near the column 34. Then, the middle part of the tensioning rope 35 is lifted by the lifting rope 36, so that the swaying rope 31 between the pulley members of the first wheel group 374 forms a double-strand structure and is basically parallel to the swaying direction, realizing the parallel traction of the beam segment 10 by the first traction device 3. In addition, the pulley members of the first wheel group 374 near the clamp 1 are equipped with a first hook 375. The first hook 375 is set away from the swaying rope 31 and is used to hook the clamp 12 of the clamp 1 by means of a buckle.

[0054] Furthermore, a second winch 42 is installed on the top of the tower 71; a reversing pulley 431 and a positioning component 432 are installed via the load-bearing cable 9; the installation of the reversing pulley 431 includes: installing a second buckle 431a via the load-bearing cable 9, and installing a second base 431b and a second pulley 431c via the second buckle 431a; simultaneously, one end of the counter-pull rope 41 is connected to the second winch 42, and the other end, after being reversed by the second pulley 431c, is fixed to the positioning component 432 via the second wheel assembly 433, so that the swing rope 31 between the second wheel assembly 433 and the positioning component 432 forms a double-strand structure, used to pull the beam segment 10 in the opposite direction of the swing direction. In addition, the pulley of the second wheel assembly 433 is equipped with a second hook 434, which is set away from the counter-pull rope 41, and is used to hook the clamp 12 of the clamp 1 by means of a buckle.

[0055] Therefore, this application can be equipped with a first traction device 3 and a second traction device 4 by setting up the tower 7 and the load-bearing cable 9, so that the implementation of this application mainly relies on the structure of the suspension bridge itself, reducing the dependence of this application on environmental implementation and improving the applicability of this application.

[0056] After the cable-mounted crane 2, the first traction device 3, and the second traction device 4 are installed, beam segment 10 can be transported to the transport point. For example, beam segment 10 can be transported to the transport point by a transport ship, which then acts as a transport platform 6 at the transport point. Alternatively, transport platform 6 can be independently located at the transport point, and beam segment 10 can be transported to transport platform 6 by a transport ship. It is understood that whether the transport ship acts as transport platform 6 at the transport point or transport platform 6 is independently located at the transport point can be determined based on the site construction conditions.

[0057] After the beam segment 10 is transported, the clamp 1, which connects the cable-mounted crane 2, the first traction device 3 on the side span, and the second traction device 4 on the middle span, is fixed to the beam segment 10. That is, the clamp 12 can be configured with multiple lifting points, which are respectively connected to the first hook 375 of the first traction device 3, the second hook 434 of the second traction device 4, and the third hook of the cable-mounted crane 2 (not shown in the figure), thus achieving the installation and fixation of the clamp 1 with the cable-mounted crane 2, the first traction device 3, and the second traction device 4. It is understood that the lifting points can be configured independently or on the same lifting rod.

[0058] After clamp 1 is fixed to beam segment 10, the hydraulic assembly 13 adjusts the chuck 12 to adjust the center of gravity of clamp 1, making it coincide with the center of gravity of beam segment 10. It can be understood that whether the centers of gravity of clamp 1 and beam segment 10 coincide can be determined by first adjusting the chuck 12 to a preset position and then lifting beam segment 10 to a certain height, for example, 2cm-3cm. Then, based on the lifting status of beam segment 10, it is determined whether beam segment 10 needs to be returned to the transport point before adjusting the center of gravity.

[0059] While adjusting the center of gravity, the tension and connection status of each cable are checked to adjust the force on each cable, ensuring that the force on each cable is basically consistent and preventing the lifting point from loosening or a single cable from being subjected to excessive force. For example, if the counter-tension rope 41 is too tight, it will pose a safety hazard to the second traction device 4.

[0060] After adjusting the center of gravity of clamp 1, the beam segment 10 is held at a preset height for a period of time using only the upward traction force applied by the cable-mounted crane 2. For example, the preset height is 25cm-35cm, and the holding time is 5min-10min. During this holding time, the status of clamp 1, cable-mounted crane 2, first traction device 3, and second traction device 4 are checked, including but not limited to: checking the cable structure of clamp 1, checking the first winch 32, and checking the second winch 42, etc., to verify the reliability of clamp 1, cable-mounted crane 2, first traction device 3, and second traction device 4, and to ensure the safety of subsequent swinging construction. For example, checking whether the lifting lugs are deformed, whether the control switches of the first winch 32, second winch 42, and cable-mounted crane 2 are normal, and whether the lifting rope 21 and swinging rope 31 have broken strands, etc.

[0061] After preliminary preparations and verifications are completed, the cable-mounted crane 2, the first traction device 3, and the second traction device 4 work together to move beam segment 10 from the transport point to the side span construction site. The process of moving beam segment 10 from the transport point to the side span construction site generally includes the following three stages, please refer to [the relevant documentation]. Figure 9 This is a schematic diagram of the construction process for the swinging construction of the main beam of the side span of a suspension bridge, provided as an embodiment of this application.

[0062] Please refer to Figure 9 (a) First, control the first traction device 3 to be in a state of no traction force, control the second traction device 4 to apply traction force in the direction of the mid-span, and control the cable crane 2 to apply upward traction force and simultaneously retrieve the cable, so that the beam segment 10 leaves the transport point at the first included angle. That is, by using the traction force applied by the second traction device 4 in the direction of the mid-span, the beam segment 10 is maintained at the position of the first included angle α, where the first included angle α is the angle between the line connecting the cable crane 2 and the projection point and the line connecting the cable crane 2 and the transport point. At the same time, the cable crane 2 lifts the beam segment 10, so that the beam segment 10 leaves the transport point while maintaining the first included angle α.

[0063] After beam segment 10 leaves the transport point and remains stable, the first traction device 3 is controlled to be in a state of no traction force; the upward traction force applied by the cable crane 2 is maintained; the traction force applied by the second traction device 4 is gradually reduced and the cable is released synchronously, so that beam segment 10 swings from the transport point to the projection point. That is, the lifting rope 21 maintains the lifting state of beam segment 10, and the beam segment 10 swings at the first included angle α by gradually loosening the counter-tension rope 41. At this time, beam segment 10... Figure 9 (a) position shifted to Figure 9(b) Position. Since the swing of the first included angle α is achieved through the cable-mounted crane 2 and the first traction device 3, the safety of the swing of the first included angle α can be ensured. The value of α ranges from 10° to 15°. Of course, if other technologies exist that can increase the safe swing angle of α, the value range of this application can also be increased accordingly. It can be understood that the first included angle α refers to the angle formed by the line connecting the cable-mounted crane 2 and the projection point and the line connecting the cable-mounted crane 2 and the transport point, which can be referenced... Figure 9 (a) The angle α between the lifting rope 21 and the dashed line.

[0064] Please refer to Figure 9 (b) After beam segment 10 is swung to the projection point, the upward traction force applied by the cable-mounted crane 2 is maintained, causing beam segment 10 to tend to be stationary; then the cable-mounted crane 2 is controlled to apply an upward traction force and simultaneously reel in the cable, causing beam segment 10 to be lifted upward to adapt to the receiving height at the side span construction site. For example, the beam segment 10 is lifted 1m to adapt to the height of the receiving platform 5.

[0065] After adjusting the height of beam segment 10 at the projection point, the second traction device 4 is controlled to be in a state without traction force; the upward traction force applied by the cable crane 2 is maintained; the first traction device 3 is controlled to apply traction force towards the side span direction and simultaneously reel in the cable, so that beam segment 10 swings towards the side span construction site at the second included angle, reaching the side span construction site. That is, the lifting rope 21 is maintained in a raised state, and the traction force of the swinging rope 31 is gradually increased, so that beam segment 10 swings at the second included angle β, and beam segment 10 from... Figure 9 (b) position shifted to Figure 9 (c) Position. Since the swing of the second included angle β is achieved through the cable-mounted crane 2 and the second traction device 4, the safety of the swing of the second included angle β can be ensured. That is, this application can ensure the safety of the first included angle α + the second included angle β, that is, the safe swing angle of this application is α + β, i.e., 20°-30°, realizing the large-angle safe swing of beam segment 10. Among them, the second included angle refers to the angle between the line connecting the cable-mounted crane 2 and the projection point and the line connecting the cable-mounted crane 2 and the side span construction point, which can be referred to Figure 9 (c) The angle mark β between the lifting rope 21 and the dashed line.

[0066] After the swing of beam segment 10 from the projection point to the side span construction site is completed, beam segment 10 is received by the sliding block at the side span construction site and fixed by the sliding block. Then, the connection between clamp 1 and beam segment 10 is released, and clamp 1 is pulled to the transport point through the reverse swing operation of beam segment 10, preparing for the swing of the next beam segment 10. Specifically, the upward traction force applied by the cable-mounted crane 2 is maintained, and the cable is gradually released through the first traction device 3, causing clamp 1 to swing from the side span construction site to the projection point at a second included angle β. After clamp 1 stabilizes, the first traction device 3 is de-tractioned, while the upward traction force applied by the cable-mounted crane 2 is maintained. Then, the cable is gradually retrieved through the second traction device 4, causing clamp 1 to swing again from the projection point to the transport point at a first included angle α, preparing for the swing of the next beam segment 10. Simultaneously, at the side span construction site, the position of beam segment 10 is moved through the sliding connection between the sliding block and the placement platform, allowing beam segment 10 to be transported to the installation position at the side span construction site. After the next beam segment 10 is received and moved, it is moved to the joint of the previous beam segment 10 using a sliding block. Finally, the beam segments 10 are spliced ​​together by welding, casting, or other methods to achieve the modular assembly of the beam segments 10, thus completing the construction of the main beam at the side span construction site.

[0067] In summary, this application provides a construction method for swinging the main girder of a suspension bridge's side span. By utilizing the suspension bridge's own tower 7 and load-bearing cable 9 structure, and by configuring the cable-mounted crane 2, the first traction device 3, and the second traction device 4, this method reduces dependence on the construction environment and improves its applicability. First, through the coordinated traction of the cable-mounted crane 2 and the first traction device 3, the beam segment 10 is swinged from the transport point at a first included angle α to the projection point of the cable-mounted crane 2 on its horizontal plane. Then, through the coordinated traction of the cable-mounted crane 2 and the second traction device 4, the beam segment 10 is swinged from the projection point at a second included angle β to the side span construction location. Therefore, this application can achieve a safe swinging motion at a large angle of α+β. Since the above swinging process, compared to existing swinging methods, only adds the second traction device 4, it can effectively reduce the investment in foundation construction facilities, shorten the construction cycle for large-angle swinging, and achieve control over the construction cost and overall construction efficiency of large-angle swinging.

[0068] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in related technologies that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0069] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate directions or positional relationships based on the exemplary directions or positional relationships shown in the accompanying drawings. They are used to facilitate the description or simplification of the embodiments of this application and are not intended to indicate or imply that the device or component 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 application.

[0070] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0071] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0072] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0073] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. A method for the swing-shifting construction of the main girder of a side span of a suspension bridge, characterized in that, include: Complete the construction of the suspension bridge's towers and cable-mounted cranes; Transport the beam segments to the transport point; The clamps, which are connected to the cable-driven crane, the first traction device on the side span, and the second traction device on the middle span, are fixed to the beam segment; The cable-mounted crane, the first traction device, and the second traction device are controlled to cooperate with each other so that the beam segment is moved from the transport point to the side span construction site; The transport point and the side span construction site are located on both sides of the horizontal projection point of the cable-mounted crane.

2. The method for swinging construction of the main girder of a suspension bridge side span according to claim 1, characterized in that, The delivery point includes: Control the first traction device to be in a state without traction force; Control the second traction device to apply traction force toward the mid-span direction; The cable-mounted crane is controlled to apply an upward traction force and simultaneously reel in the cable, so that the beam segment leaves the transport point at a first included angle; Wherein, the first included angle refers to the angle formed by the line connecting the cable-mounted crane and the projection point and the line connecting the cable-mounted crane and the transport point.

3. The method for swinging construction of the main girder of a suspension bridge side span according to claim 2, characterized in that, Between the transport point and the projection point, including: Control the first traction device to be in a state without traction force; Maintain the upward traction force applied by the cable-mounted crane; The traction force applied by the second traction device is gradually reduced and the cable is released synchronously, so that the beam segment swings from the transport point to the projection point.

4. The method for swinging construction of the main girder of a suspension bridge side span according to claim 3, characterized in that, Between the projection point and the side span construction location, including: Control the second traction device to be in a state without traction force; Continue to maintain the upward traction force applied by the cable-mounted crane; Control the first traction device to apply traction force toward the side span direction and simultaneously reel in the cable, so that the beam segment swings toward the side span construction site at a second included angle and reaches the side span construction site; The second included angle refers to the angle between the line connecting the cable-mounted crane and the projection point and the line connecting the cable-mounted crane and the side span construction site.

5. The method for swinging construction of the main girder of a suspension bridge side span according to claim 4, characterized in that, At the construction site of the side span, it also includes: The beam segment is received by a slide block, and the slide block is slidably connected to the placement platform for splicing multiple sets of the beam segment after they have been received.

6. The method for swinging construction of the main girder of a suspension bridge side span according to claim 2, characterized in that, The delivery point also includes: Before controlling the cable-mounted crane to retract the cable, maintain the upward traction force applied by the cable-mounted crane so that the beam segment remains stationary at a preset height for a period of time to verify the reliability of the clamp.

7. The method for swinging construction of the main girder of a suspension bridge side span according to claim 3, characterized in that, At the projection point, including: Maintain the upward traction force applied by the cable-mounted crane to bring the beam segment to a static position; The cable-mounted crane is controlled to apply an upward traction force and simultaneously reel in the cable, thereby lifting the beam segment upward to accommodate the receiving height at the side span construction site.

8. The method for swinging construction of the main girder of a suspension bridge side span according to claim 7, characterized in that, Also includes: The traction height of the first traction device is adjusted by a lifting device set on the side of the span, which is used to adjust the receiving state of the beam segment.

9. The method for swinging construction of the main girder of a suspension bridge side span according to claim 1, characterized in that, After the clamp is fixed to the beam segment, it includes: Adjust the center of gravity of the clamp so that it coincides with the center of gravity of the beam segment.

10. The method for swinging construction of the main girder of a suspension bridge side span according to claim 1, characterized in that, Also includes: The cable tower is used to install traction equipment for the first traction device and the second traction device; The first traction device and the second traction device's anti-pull node are installed through the load-bearing cable of the cable-mounted crane.

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