Wind-resistant catwalk system for space cable suspension bridge construction and construction method of wind-resistant catwalk system

Abstract

The invention discloses a wind-resistant catwalk system for construction of a space cable suspension bridge and a construction method of the wind-resistant catwalk system. The core of the wind-resistant catwalk system is that two catwalk units are integrated into an integral space structure by additionally arranging an outer wind-resistant cable and a transverse channel, so that the wind-resistant stability is improved; the system mainly comprises the following components: two basic catwalk units, a catwalk small portal, a wind-resistant cable anchoring cross beam, an outer side wind-resistant cable and a transverse channel. The catwalk structure solves the problems that (1) under the wind load effect, two catwalks of an existing catwalk structure are prone to generating relative displacement and asynchronous torsional vibration, an overall cooperative stress space structure cannot be formed, and the overall stability and rigidity are insufficient; (2) the anti-roll rigidity is weak, the restoring moment provided by a traditional wind-resistant cable arrangement mode is limited, and the lateral overturning trend of the catwalk is difficult to effectively resist; and (3) an existing catwalk wind-resistant device is complicated in structure, so that high-altitude mounting and dismounting are difficult, the risk is high, the cost is increased, the universality is poor, and the existing catwalk wind-resistant device is difficult to recycle in different bridge projects.

Description

Technical Field

[0001] This invention relates to the field of suspension bridge construction, and more specifically to a wind-resistant catwalk system and its construction method for spatial cable suspension bridge construction. Background Technology

[0002] The catwalk, serving as a crucial high-altitude working passage and temporary work area in the superstructure construction of a suspension bridge, is parallel to the main cable alignment and acts as a platform for construction workers to perform core operations such as cable strand pulling, cable adjustment, and saddle insertion. In areas with complex wind conditions, such as canyons and coastal areas, the wind resistance stability of the catwalk directly determines the safety, efficiency, and quality of the main cable erection.

[0003] To improve the wind resistance stability of catwalks, various auxiliary devices have been proposed in existing technologies. For example, a typical catwalk wind-resistant auxiliary device and system can be found in invention patent application publication number "CN 120465376 A". This patent discloses a wind-resistant system comprising a catwalk gantry, triangular braces, corner braces, and auxiliary cables. It suppresses catwalk displacement under wind load by enhancing gantry rigidity and installing auxiliary cables. The triangular braces and corner braces of this device are welded or bolted to the catwalk gantry, forming a large and complex spatial structure. Installing and dismantling such components at a height of hundreds of meters is cumbersome, exposes personnel to hazardous environments for extended periods, and poses significant safety risks. The gantry requires the integration of multiple braces and connecting rods, resulting in a complex structure for each gantry, high precision requirements, and significantly increased manufacturing costs. Furthermore, this complex structure, customized for a specific bridge type, lacks versatility and is difficult to reuse directly in bridge projects with different spans or main cable spacings, hindering reusability and reducing construction economics. Summary of the Invention

[0004] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a wind-resistant catwalk system and its construction method for the construction of spatial cable suspension bridges. It solves the following problems: (1) Under wind load, the two catwalks of the existing catwalk structure are prone to relative displacement and asynchronous torsional vibration, which cannot form a spatial structure with overall coordinated force, resulting in insufficient overall stability and stiffness; (2) The anti-tilting stiffness is weak, and the restoring moment provided by the traditional wind-resistant cable arrangement method is limited, which is difficult to effectively resist the lateral overturning tendency of the catwalk; (3) The existing catwalk wind-resistant device has a complex structure, which leads to difficulties in high-altitude installation and disassembly, high risk, increased cost, and poor versatility, making it difficult to reuse in different bridge projects.

[0005] This invention is implemented by constructing a wind-resistant catwalk system for the construction of a spatial cable suspension bridge. The core of this system lies in integrating two catwalk units into a single spatial structure by adding outer wind-resistant cables and a transverse passage, thereby improving wind resistance stability. The system mainly comprises the following components: two basic catwalk units, a catwalk gantry, wind-resistant cable anchoring beams, outer wind-resistant cables, and a transverse passage. Basic catwalk unit: Each catwalk unit has a conventional structure, including load-bearing cables, surface layer, handrail cables, large and small crossbeams, etc. A certain distance is maintained between two catwalk units to allow for main cable construction operations. The catwalk surface layer itself does not need to be widened. Unlike conventional catwalks, this system strengthens and lengthens the large crossbeams of the catwalk at certain intervals to form "wind-resistant cable anchoring crossbeams" for connecting the outer wind-resistant cables.

[0006] Catwalk gantries: These are evenly spaced along the catwalk. The catwalk gantries are not only used for positioning the traction cables of the traction system, but also form a spatial structure with the catwalk load-bearing cables, which can improve the wind resistance stability of the catwalk itself to a certain extent. Outer wind-resistant cables: Two wind-resistant cables are added to the outer side of each catwalk unit. The wind-resistant cables are arranged roughly parallel to the catwalk load-bearing cables. The wind-resistant cables are set at a certain distance from the outer side of the catwalk unit. This distance is significantly larger than the arrangement distance of traditional catwalk wind-resistant cables to provide a larger anti-overturning lever arm. The wind-resistant cables are kept at an appropriate distance from each other. Lateral passageways: Lateral passageways are arranged along the span of the catwalk at designed intervals. Located below the catwalk and wind-resistant cables, their upper chords are connected to the catwalk's load-bearing ropes and also to the wind-resistant cables on both sides of the catwalk. These passageways serve as spatial connectors, linking the catwalk's load-bearing ropes and wind-resistant cables into a unified structure. They also function as a secondary feature for lifting the main girder during bridge construction, improving construction efficiency.

[0007] A construction method for a wind-resistant catwalk system used in the construction of a space cable suspension bridge, characterized in that: The construction steps for the wind-resistant catwalk system are as follows: Step 1: Erect the main structure of the catwalk's load-bearing ropes and wind-resistant cables. ① The anchoring beams, tie rods and other components are pre-installed on the top of the main towers on both sides and reliably connected with the embedded parts to prepare for the subsequent anchoring of the load-bearing ropes and wind-resistant cables; ② First, set up the traction system, and then use the established traction system to pull the catwalk load-bearing ropes from one bank to the other. The load-bearing ropes are erected in a symmetrical order between the left and right spans and between the side spans. During the process, the main tower deviation needs to be monitored and adjusted in a timely manner. ③ After the catwalk load-bearing rope, the outer wind-resistant cable is pulled to the design position using the same traction system. Using equipment such as the tower top winch and jacks, the wind-resistant cable is pulled to the anchoring device, and its anchor head is connected to the tie rod. Then, the wind-resistant cable is tensioned using hydraulic jacks to achieve the design cable force, and finally, permanent fixing is completed using components such as anchoring steel strips. Step 2: Install horizontal passageways to form a spatial structure. Below the catwalk and wind-resistant cables, the transverse passages are hoisted at the designed intervals; the transverse passages are lifted to the design elevation using a bridge deck crane or cable crane, and their two ends are reliably connected to the load-bearing ropes of the catwalk units on both sides and the already tensioned outer wind-resistant cables; this connection should be able to effectively transfer lateral and vertical loads, integrating the originally independent components into a unified spatial force-bearing system; Step 3: Lay the catwalk surface and install auxiliary facilities ① Lay the catwalk surface netting on the catwalk load-bearing ropes that have been erected and adjusted in place; ② Install the large and small crossbeams and wind-resistant cable anchoring crossbeams according to the design spacing, reliably connect them to the catwalk load-bearing ropes, and anchor the wind-resistant cable anchoring crossbeams to the outer wind-resistant cables to ensure load transfer; ③ Install the catwalk railings, handrails, and catwalk gates in sequence to complete the construction of the basic catwalk unit; Step 4: Overall Debugging and Acceptance After all transverse passages are installed and the connections are checked to be secure, the entire catwalk system undergoes necessary load tests or vibration monitoring to verify whether its overall stiffness, stability, and dynamic characteristics meet the design requirements. Once the system passes acceptance, the wind-resistant catwalk system can be put into formal use. Usage process: During the construction of the bridge superstructure, the integrated catwalk system is used as a stable aerial work platform; its spatial structure can effectively resist wind loads from different directions, ensuring construction safety and accuracy; after the main cable, cable clamps, suspenders, etc. are all installed and the bridge has the ability to bear its own weight, the catwalk system is dismantled in reverse order according to the predetermined plan.

[0008] The present invention has the following advantages: Compared with existing technologies, the wind-resistant catwalk system and construction method provided by this invention, by integrating two catwalks, outer wind-resistant cables, and lower transverse passages into a unified spatial grid structure, have the following significant advantages and beneficial effects: (1) The two catwalk units and the outer wind-resistant cable are connected by a transverse channel to form a spatial grid structure, which effectively resists wind loads from different directions, suppresses torsional deformation and asynchronous vibration of the catwalk, and improves overall stability. (2) By placing the wind-resistant cables at a location far from the outer side of the catwalk unit, the lever arm of the restoring torque provided by the wind-resistant cables is significantly increased. According to the lever principle (M=F×L), under the same cable force, the anti-tilting stability is significantly improved, effectively preventing the catwalk from overturning laterally in strong winds; (3) The lower transverse channel serves as a "transverse stiffening rib", connecting the catwalk load-bearing cable and the wind-resistant cable into one, which improves the system stiffness and damping characteristics, and can quickly dissipate the energy of wind-induced vibration and reduce the vibration amplitude. (4) Compared with the complex pole system coupled with the gantry in the prior art, the transverse channel and wind-resistant cable system of the present invention are self-contained, and the installation and dismantling operations are more independent and simple, which significantly reduces the risk of high-altitude operations and the time cost; (5) The main components are highly standardized and can be used as a complete and mature system module. They can be quickly transferred and reused in different construction sections or different bridge projects, which greatly improves the turnover rate of materials, reduces the temporary engineering cost of a single construction, and has significant economic benefits. (6) The structure is strong, with small deformation and weak vibration, providing a safer, more stable and comfortable high-altitude working environment for construction personnel. At the same time, it ensures the construction accuracy of key processes such as main cable erection and cable clamp positioning, which is of great significance to ensuring the final bridge alignment and quality. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the elevation of the wind-resistant catwalk system; Figure 2 This is a schematic diagram of the cross-section of the wind-resistant catwalk system; Figure 3 This is a schematic diagram of the wind-resistant catwalk system; Figure 4 This is a schematic diagram of the standard cross-section of a catwalk system.

[0010] The components include: 1. Wind-resistant cable; 2. Horizontal passage; 3. Catwalk load-bearing cable; 4. Upper chord; 5. Connector; 6. Pulley; 7. M20 bolt; 8. Vertical fixing buckle. Detailed Implementation

[0011] The following will be combined with the appendix Figures 1-4 This invention will be described in detail, and the technical solutions in the embodiments of this invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0012] This invention provides a wind-resistant catwalk system for the construction of spatial cable suspension bridges, such as... Figures 1-4As shown, the core of this wind-resistant catwalk system lies in integrating two catwalk units into a single spatial structure by adding outer wind-resistant cables and a transverse passage, thereby improving wind resistance stability. The system mainly includes the following components: two basic catwalk units, catwalk gantry, wind-resistant cable anchor beam, outer wind-resistant cable 1, and transverse passage 2. Basic catwalk unit: Each catwalk unit has a conventional structure, including load-bearing cable 3, surface layer, handrail cable, large and small crossbeams, etc. A certain distance is maintained between two catwalk units to allow for main cable construction operations. The catwalk surface layer itself does not need to be widened. Unlike conventional catwalks, this system strengthens and lengthens the large crossbeams of the catwalk at certain intervals to form "wind-resistant cable anchoring crossbeams" for connecting the outer wind-resistant cables.

[0013] Catwalk gantries: These are evenly spaced along the catwalk. The catwalk gantries are not only used for positioning the traction cables of the traction system, but also form a spatial structure with the catwalk load-bearing cables, which can improve the wind resistance stability of the catwalk itself to a certain extent. Outer wind-resistant cables: Two wind-resistant cables 1 are added to the outside of each catwalk unit. The wind-resistant cables 1 are arranged roughly parallel to the catwalk load-bearing cables 3. The wind-resistant cables are set at a certain distance from the outside of the catwalk unit. This distance is significantly greater than the arrangement distance of traditional catwalk wind-resistant cables to provide a larger anti-overturning lever arm. The wind-resistant cables maintain an appropriate spacing. Lateral passages: Lateral passages are arranged along the span of the catwalk at designed intervals. Located below the catwalk and wind-resistant cables, the upper chord 4 of the lateral passage is connected to the catwalk load-bearing rope 3 and also to the wind-resistant cables 1 on both sides of the catwalk. The lateral passage 2 serves as a spatial connection, linking the catwalk load-bearing rope 3 and the wind-resistant cables 1 into a single unit. It also serves as a secondary mechanism for lifting the main girder during bridge construction, improving construction efficiency.

[0014] The construction steps of a wind-resistant catwalk system for spatial cable suspension bridge construction according to this application are described below: Step 1: Erect the main structure of the catwalk's load-bearing ropes and wind-resistant cables. ① The anchoring beams, tie rods and other components are pre-installed on the top of the main towers on both sides and reliably connected with the embedded parts to prepare for the subsequent anchoring of the load-bearing ropes and wind-resistant cables.

[0015] ② First, set up the traction system, and then use the established traction system to pull the catwalk load-bearing rope from one bank to the other. The load-bearing rope is set up in a symmetrical order of left and right spans and side spans. During the process, the main tower deviation needs to be monitored and adjusted in a timely manner.

[0016] ③ After the catwalk load-bearing rope, the outer wind-resistant cable is pulled to the design position using the same traction system. Using equipment such as the tower top winch and jacks, the wind-resistant cable is pulled to the anchoring device, and its anchor head is connected to the tie rod. Then, the wind-resistant cable is tensioned using hydraulic jacks to achieve the design cable force, and finally, permanent fixing is completed using components such as anchoring steel strips.

[0017] Step 2: Install horizontal passageways to form a spatial structure. Below the catwalk and wind-resistant cables, lateral passageways are hoisted at the designed spacing. Using a bridge crane or cable crane, the lateral passageways are lifted to the designed elevation, and both ends are reliably connected to the load-bearing ropes of the catwalk units on both sides and the already tensioned outer wind-resistant cables. This connection should effectively transfer lateral and vertical loads, integrating the originally independent components into a unified spatial force-bearing system.

[0018] Step 3: Lay the catwalk surface and install auxiliary facilities ① Lay the catwalk surface netting on the catwalk load-bearing ropes that have been erected and adjusted in place; ② Install the large and small crossbeams and wind-resistant cable anchoring crossbeams according to the design spacing, reliably connect them to the catwalk load-bearing ropes, and anchor the wind-resistant cable anchoring crossbeams to the outer wind-resistant cables to ensure load transfer; ③ Install the catwalk railings, handrails, and catwalk gates in sequence to complete the construction of the basic catwalk unit; Step 4: Overall Debugging and Acceptance After all transverse passages are installed and the connections are checked for secureness, the entire catwalk system undergoes necessary load tests or vibration monitoring to verify that its overall stiffness, stability, and dynamic characteristics meet design requirements. Once accepted, the wind-resistant catwalk system can be put into formal use.

[0019] Usage: During the construction of the bridge superstructure, this integrated catwalk system serves as a stable aerial work platform. Its spatial structure effectively resists wind loads from different directions, ensuring construction safety and precision. After the main cables, cable clamps, suspenders, etc., are all installed and the bridge has self-supporting capacity, the catwalk system is dismantled in reverse order according to the predetermined plan.

[0020] This patent has the following advantages and beneficial effects: Compared with existing technologies, the wind-resistant catwalk system and construction method provided by this invention, by integrating two catwalks, outer wind-resistant cables, and lower transverse passages into a unified spatial grid structure, have the following significant advantages and beneficial effects: (1) The two catwalk units and the outer wind-resistant cable are connected by a transverse channel to form a spatial grid structure, which effectively resists wind loads from different directions, suppresses torsional deformation and asynchronous vibration of the catwalk, and improves overall stability. (2) By placing the wind-resistant cables at a location far from the outer side of the catwalk unit, the lever arm of the restoring torque provided by the wind-resistant cables is significantly increased. According to the lever principle (M=F×L), under the same cable force, the anti-tilting stability is significantly improved, effectively preventing the catwalk from overturning laterally in strong winds; (3) The lower transverse channel serves as a "transverse stiffening rib", connecting the catwalk load-bearing cable and the wind-resistant cable into one, which improves the system stiffness and damping characteristics, and can quickly dissipate the energy of wind-induced vibration and reduce the vibration amplitude. (4) Compared with the complex pole system coupled with the gantry in the prior art, the transverse channel and wind-resistant cable system of the present invention are self-contained, and the installation and dismantling operations are more independent and simple, which significantly reduces the risk of high-altitude operations and the time cost; (5) The main components are highly standardized and can be used as a complete and mature system module. They can be quickly transferred and reused in different construction sections or different bridge projects, which greatly improves the turnover rate of materials, reduces the temporary engineering cost of a single construction, and has significant economic benefits. (6) The structure is strong, with small deformation and weak vibration, providing a safer, more stable and comfortable high-altitude working environment for construction personnel. At the same time, it ensures the construction accuracy of key processes such as main cable erection and cable clamp positioning, which is of great significance to ensuring the final bridge alignment and quality.

[0021] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wind-resistant catwalk system for the construction of a space cable suspension bridge, characterized in that... ； The core of this wind-resistant catwalk system is to integrate two catwalk units into a whole spatial structure by adding outer wind-resistant cables and a transverse passage, thereby improving wind resistance stability. The system mainly includes the following components: two basic catwalk units, catwalk gantry, wind-resistant cable anchor beam, outer wind-resistant cable (1), and transverse passage (2). Basic catwalk unit: Each catwalk unit has a conventional structure, including load-bearing cable (3), surface layer, handrail cable, large and small crossbeams, etc.; a certain distance is maintained between two catwalk units to allow for main cable construction operations; the catwalk surface layer itself does not need to be widened; unlike conventional catwalks, in this system, the large crossbeams of the catwalk are reinforced and lengthened at certain intervals to form "wind-resistant cable anchoring crossbeams" for connecting the outer wind-resistant cables; Catwalk gantries: These are evenly spaced along the catwalk. The catwalk gantries are not only used for positioning the traction cables of the traction system, but also form a spatial structure with the catwalk load-bearing cables, which can improve the wind resistance stability of the catwalk itself to a certain extent. Outer wind-resistant cable: Two wind-resistant cables (1) are added to the outside of each catwalk unit. The wind-resistant cables (1) are arranged roughly parallel to the catwalk load-bearing cables (3). The wind-resistant cables are set at a certain distance from the outside of the catwalk unit. This distance is significantly greater than the arrangement distance of the traditional catwalk wind-resistant cables to provide a larger anti-overturning lever arm. The wind-resistant cables maintain an appropriate spacing. Lateral passage: Along the span of the catwalk, a lateral passage is arranged according to the design spacing; the lateral passage is located below the catwalk and the wind-resistant cable, and its upper chord (4) is connected to the catwalk load-bearing rope (3), and at the same time connected to the wind-resistant cable (1) on both sides of the catwalk; the lateral passage (2) plays a spatial connecting role, connecting the catwalk load-bearing cable (3) and the wind-resistant cable (1) into a whole; and also serves as the main cable for lifting the main beam in the later stage, which is used to lift the main beam in bridge construction to improve construction efficiency.

2. A construction method for a wind-resistant catwalk system used in the construction of a space cable suspension bridge, characterized in that... ； The construction steps for the wind-resistant catwalk system are as follows: Step 1: Erect the main structure of the catwalk's load-bearing ropes and wind-resistant cables. ① The anchoring beams, tie rods and other components are pre-installed on the top of the main towers on both sides and reliably connected with the embedded parts to prepare for the subsequent anchoring of the load-bearing ropes and wind-resistant cables; ② First, set up a traction system, and then use the established traction system to pull the catwalk load-bearing rope from one bank to the other. The load-bearing ropes are erected in a symmetrical order between the left and right spans and between the side spans. During the process, the main tower deviation needs to be monitored and adjusted in a timely manner. ③ After the catwalk load-bearing rope, use the same traction system to pull the outer wind-resistant cable to the design position. Use the tower top winch and jacks to pull the wind-resistant cable that has been in place to the anchoring device and connect its anchor head to the tie rod. Then, the anti-wind cable is tensioned using hydraulic jacks to reach the designed cable force, and finally permanently fixed using components such as anchor steel strips; Step 2: Install horizontal passageways to form a spatial structure. Below the catwalk and wind-resistant cables, the transverse passages are hoisted at the designed intervals; the transverse passages are lifted to the design elevation using a bridge deck crane or cable crane, and their two ends are reliably connected to the load-bearing ropes of the catwalk units on both sides and the already tensioned outer wind-resistant cables; this connection should be able to effectively transfer lateral and vertical loads, integrating the originally independent components into a unified spatial force-bearing system; Step 3: Lay the catwalk surface and install auxiliary facilities ① Lay the catwalk surface netting on the catwalk load-bearing ropes that have been erected and adjusted in place; ② Install the large and small crossbeams and wind-resistant cable anchoring crossbeams according to the design spacing, reliably connect them to the catwalk load-bearing ropes, and anchor the wind-resistant cable anchoring crossbeams to the outer wind-resistant cables to ensure load transfer; ③ Install the catwalk railings, handrails, and catwalk gates in sequence to complete the construction of the basic catwalk unit; Step 4: Overall Debugging and Acceptance After all transverse passages are installed and the connections are checked to be secure, the entire catwalk system undergoes necessary load tests or vibration monitoring to verify whether its overall stiffness, stability, and dynamic characteristics meet the design requirements. Once the system passes acceptance, the wind-resistant catwalk system can be put into formal use. Usage: During the construction of the bridge superstructure, the integrated catwalk system was used as a stable aerial work platform; Its spatial structure can effectively resist wind loads from different directions, ensuring construction safety and precision; after the main cable, cable clamps, suspenders and other components are all installed and the bridge has the ability to bear its own weight, the catwalk system will be dismantled in reverse order according to the predetermined plan.

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