Lifting and shifting mechanical equipment for cable-stayed bridge cable replacement

Abstract

The invention relates to the technical field of cable-stayed bridge cable replacement, and discloses a lifting and shifting mechanical device for cable-stayed bridge cable replacement, the lifting and shifting mechanical device comprises a crane, one side of the crane is provided with a fixing assembly, and one side of the crane is provided with a protection assembly; the fixing assembly comprises a clamping ring, two sets of contact pads are fixedly connected to one side of the inner wall of the clamping ring, a plurality of bolts are embedded in the clamping ring in a threaded mode, a plurality of fixing plates are fixedly connected to the outer surface of the clamping ring, and hydraulic rods are fixedly connected to one sides of the outer surfaces of the multiple fixing plates. The plurality of contact pads are all made of a polyester type modified polyurethane elastomer material; the invention aims to solve the problems that an existing crane hook is connected with an inhaul cable through a binding band, temporary fixation is realized only by manual winding, the synthetic fiber binding band is made of a flexible material and is easy to generate irreversible plastic tensile deformation after being stressed, and the static friction force between the binding band and the inhaul cable is difficult to meet the stress requirement of the inhaul cable.

Description

Technical Field

[0001] This invention relates to the field of cable-stayed bridge cable replacement technology, specifically to a lifting and relocation mechanical device for cable replacement of cable-stayed bridges. Background Technology

[0002] As the core load-bearing component of a cable-stayed bridge, the cables directly bear the loads of the main beam and tower. During long-term service, they are susceptible to damage such as environmental corrosion and alternating loads, resulting in fatigue and wire breakage. To ensure the safety of the bridge structure and normal traffic, the damaged cables need to be removed and replaced, which is the cable-stayed bridge cable replacement construction.

[0003] In the low-altitude transfer phase of this construction, cranes are commonly used to achieve spatial displacement of cables. In existing construction, synthetic fiber hoisting straps are often used to temporarily and flexibly connect the crane hook to the cable. The force transmission between the hook and the cable is achieved by wrapping and locking the straps, thus completing basic transfer operations such as the cable moving from the transport carrier to the bridge deck and short-distance relocation of the bridge deck.

[0004] The existing method of connecting crane hooks to cables via straps relies solely on manual winding for temporary fixation. The synthetic fiber straps are flexible materials and are prone to irreversible plastic tensile deformation under stress, resulting in a rapid decrease in winding tightness. Furthermore, the smooth PE protective layer on the cable surface makes it difficult for the static friction between the straps and the cable to meet the cable's stress requirements, easily leading to slippage of the straps along the cable's axial and radial directions. In addition, it is difficult to accurately control the tightness of manual winding; if it is too tight, it will excessively compress the PE sheath of the cable, causing damage such as dents and indentations. Summary of the Invention

[0005] The purpose of this invention is to provide a lifting and relocation mechanical device for replacing cables of cable-stayed bridges, in order to solve the problems in the existing crane hooks that connect cables by straps in the background art. These methods rely solely on manual winding for temporary fixation. The synthetic fiber straps are flexible materials and are prone to irreversible plastic tensile deformation under stress, resulting in a rapid decrease in winding tightness. Furthermore, the smooth PE protective layer on the cable surface makes it difficult for the static friction between the straps and the cable to meet the cable's stress requirements, easily leading to slippage of the straps along the axial and radial directions of the cable. In addition, the tightness of manual winding is difficult to control precisely. If it is too tight, it will cause excessive compression of the PE sheath of the cable, resulting in damage such as dents and indentations.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a lifting and shifting mechanical device for replacing cables of a cable-stayed bridge, including a crane, a fixing component on one side of the crane, and a protective component on one side of the crane;

[0007] The fixing component includes a retaining ring, and two sets of contact pads are fixedly connected to one side of the inner wall of the retaining ring. Multiple bolts are embedded in the internal thread of the retaining ring. Multiple fixing plates are fixedly connected to the outer surface of the retaining ring, and hydraulic rods are fixedly connected to one side of the outer surface of each of the multiple fixing plates. The multiple contact pads are all made of polyester modified polyurethane elastomer material.

[0008] The protective assembly includes multiple liquid cylinders, and each of the multiple liquid cylinders has a sliding rod slidably embedded inside in a horizontal direction. A piston is fixedly connected to one side of the outer surface of each of the multiple sliding rods. Each of the multiple liquid cylinders has a liquid outlet pipe inside, and each of the multiple liquid outlet pipes has a pressure valve inside.

[0009] Preferably, a steel cable is fixedly connected to the outer surface of the retaining ring, and the end of the steel cable away from the retaining ring is fixedly connected to the crane.

[0010] Preferably, the output shafts of the plurality of hydraulic rods are all fixedly connected to a fixing groove, and a connecting rod is rotatably embedded inside the plurality of fixing grooves.

[0011] Preferably, the outer surfaces of the plurality of connecting rods are rotatably fitted with rollers, and the plurality of rollers are made of 45# high-quality carbon structural steel, and the outer sheath of the plurality of rollers is made of polyether-type polyurethane elastomer.

[0012] Preferably, a liquid replenishment pipe is fixedly connected to one side of the outer surface of the plurality of liquid cylinders, and the outer surface of the plurality of liquid replenishment pipes is threaded with a threaded cap.

[0013] Preferably, a baffle is fixedly connected to one side of the outer surface of each of the plurality of slide rods, and a spring is wound around the outer surface of each of the plurality of slide rods.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0015] First, in this invention, after the cable is prepared, a crane pulls the clasp to the vicinity of the cable. The clasp is then fitted onto the outer surface of the cable, and a bolt is passed through it to clamp the clasp. This clamps the clasp, causing the contact pad to adhere to the cable. The contact pad is made of polyester-modified polyurethane elastomer, which, compared to ordinary polyurethane, offers superior wear resistance, tear resistance, and aging resistance while maintaining good elasticity and a high static friction coefficient. When in flexible contact with the cable's PE sheath, there is no hard compression or scraping, effectively improving the anti-slip effect between the clamping surface and the cable. It is also resistant to outdoor ultraviolet radiation and high / low temperature environments, and shows no permanent wear after repeated clamping. With its plastic deformation and long service life, this method utilizes multiple rollers and hydraulic rods to support the cable after installation. The hydraulic rods further assist in fixing and securing the cable. Compared to the existing temporary fixing method using strapping, this technical solution employs a full-circumference wrapping structure, achieving rigid locking through bolt closure. This replaces the flexible wrapping of straps, resisting the axial and radial forces caused by dynamic alternating loads and wind swaying during cable lifting. It prevents relative displacement between the cable and the fixed structure. Furthermore, the bolt closure method, compared to manual strapping, eliminates the need for operators to rely on experience to control tightness, reducing costs. Human error is minimized, ensuring consistency in each connection. This solves the problems of slippage and loosening caused by stretching, deformation, or loose wrapping of the straps, improving safety during cable lifting and eliminating the risk of falls from heights. Simultaneously, the contact pads use flexible polyurethane material, which possesses high elasticity, a high coefficient of friction, and low hardness. This creates flexible contact with the cable's PE protective layer, avoiding the problems of existing straps' flexible but easily cut synthetic fiber materials or hard contact with metal rigging that leads to scratches, dents, and damage to the cable's PE sheath. This protects the cable's corrosion protection system, preventing corrosion and fatigue damage caused by exposed internal steel strands. The high coefficient of friction of polyurethane material further enhances the static friction between the clamping surface and the cable surface. Combined with the rigid locking of the retaining ring, multiple hydraulic rods and rollers form an omnidirectional clamping and guiding structure for the cable. This differs from the drawback of tie straps, which offer no posture constraints and only provide simple suspension. It limits the vertical movement and horizontal swaying of the cable. The four sets of rollers work together to constrain the rotation and torsion of the cable around its own axis, ensuring that the cable maintains the preset posture during the lifting process. This prevents the cable end from deviating from the installation position due to swaying and rotation, reduces the need for manual high-altitude correction, and lowers the risks of high-altitude operations.

[0016] Secondly, in this invention, the operator adds a rust-preventive and protective composite liquid to multiple liquid cylinders in advance through a replenishment pipe. When the retaining ring is closed, one end of the retaining ring contacts the baffle. When the operator closes the retaining ring with a bolt, the baffle moves the piston inside the liquid cylinder via a sliding rod. The piston sprays the rust-preventive and protective composite liquid out of the liquid cylinder through the outlet pipe and pressure valve. By spraying the rust-preventive and protective composite liquid onto the surface of the cable, a dense protective film is formed. Simultaneously, the operator can use the spraying of the rust-preventive and protective composite liquid to help determine the locking status of the retaining ring. Through the above technical solution, only when the retaining ring is fully closed... After the bolts are securely connected, the pressure valve is ruptured to spray the medium, avoiding ineffective loss of the medium caused by premature or forced spraying. It also prevents the medium from being blown away by the wind or washed away by rain before construction, and avoids problems such as reduced friction and bolt slippage caused by the medium adhering to the clamping surface of the retaining ring in advance. The anti-rust and protective composite liquid medium adheres to the outer surface of the cable, forming a dense protective film that effectively isolates impurities such as air, water vapor, and dust, preventing the PE sheath of the cable from aging and breaking. At the same time, it can also prevent rust on the exposed metal cable ends and clamps of the cable, preventing corrosion of metal parts. The medium can also adhere to the retaining ring to form an anti-rust protective layer. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is one of the three-dimensional structural schematic diagrams of the present invention;

[0019] Figure 3 This is a second schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 4 This is a partial three-dimensional structural schematic diagram of the present invention.

[0021] The components include: 1. Crane; 2. Snap ring; 201. Steel cable; 202. Bolt; 3. Contact pad; 4. Fixing plate; 401. Hydraulic rod; 402. Fixing groove; 403. Connecting rod; 5. Liquid cylinder; 501. Slide rod; 502. Piston; 503. Baffle; 504. Spring; 505. Liquid outlet pipe; 506. Pressure valve; 507. Liquid replenishment pipe; 508. Threaded cap; 6. Roller. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-4 A lifting and shifting mechanical device for replacing cables of a cable-stayed bridge includes a crane 1, a fixing component on one side of the crane 1, and a protective component on one side of the crane 1.

[0024] The fixing component includes a retaining ring 2, and two sets of contact pads 3 are fixedly connected to one side of the inner wall of the retaining ring 2. Multiple bolts 202 are embedded in the internal thread of the retaining ring 2. Multiple fixing plates 4 are fixedly connected to the outer surface of the retaining ring 2, and hydraulic rods 401 are fixedly connected to one side of the outer surface of each of the multiple fixing plates 4. The multiple contact pads 3 are all made of polyester modified polyurethane elastomer material.

[0025] The protective assembly includes multiple liquid cylinders 5, and each of the multiple liquid cylinders 5 has a sliding rod 501 slidably embedded inside in a horizontal direction. A piston 502 is fixedly connected to one side of the outer surface of each of the multiple sliding rods 501. Each of the multiple liquid cylinders 5 has an outlet pipe 505 inside, and each of the multiple outlet pipes 505 has a pressure valve 506 inside.

[0026] Through the above technical solution, after the cable is prepared, the shackle 2 is pulled to the vicinity of the cable by the crane 1, and then the shackle 2 is fitted onto the outer surface of the cable. Subsequently, the bolt 202 is passed through the shackle 2 and clamped by the bolt 202, thereby causing the contact pad 3 to adhere to the cable. The contact pad 3 is made of polyester-modified polyurethane elastomer material. Compared with ordinary polyurethane, this material has better wear resistance, tear resistance, and aging resistance, while maintaining good elasticity and a high static friction coefficient. When in flexible contact with the cable's PE sheath, there is no hard compression or scraping, effectively improving the anti-slip effect between the clamping surface and the cable. It is also resistant to outdoor ultraviolet radiation, high and low temperature environments, and repeated exposure. After clamping, there is no permanent plastic deformation, resulting in a long service life. Once the cable is installed, it is supported by multiple rollers 6 and hydraulic rods 401. Multiple hydraulic rods 401 also assist in fixing and supporting the cable. Compared to the existing temporary fixing method using strapping, the clamp 2 adopts a full-circumference wrapping structure, achieving rigid locking through bolt 202 closure. This replaces the flexible wrapping of straps, resisting the axial and radial forces caused by dynamic alternating loads and wind swaying during cable lifting, preventing relative displacement between the cable and the fixed structure. The bolt 202 closure method, compared to manual strapping, eliminates the need for manual operation. Personnel experience ensures tightness control, reducing human error and guaranteeing consistency in each connection. This solves the problems of slippage and loosening caused by stretching deformation and loose wrapping of the straps, improving the safety of the cable lifting process and eliminating the risk of falls from heights. Meanwhile, the contact pad 3 uses a flexible polyurethane material with high elasticity, high coefficient of friction, and low hardness, forming a flexible contact with the cable's PE protective layer. This avoids the problems of existing straps' synthetic fiber materials being easily cut, or the hard contact with metal rigging causing scratches, dents, and damage to the cable's PE sheath. It also protects the cable's anti-corrosion system, preventing corrosion and fatigue damage caused by exposed internal steel strands. Meanwhile, the high coefficient of friction of polyurethane material further enhances the static friction between the clamping surface and the cable surface. Combined with the rigid locking of the snap ring 2, multiple sets of hydraulic rods 401 and rollers 6 form an omnidirectional clamping and guiding structure for the cable. This differs from the drawback of straps, which have no posture constraints and can only achieve simple suspension. This limits the vertical movement and horizontal swaying of the cable. The four sets of rollers 6 work together to constrain the rotation and torsion of the cable around its own axis, ensuring that the cable always maintains the preset posture during the lifting process. This avoids the cable end deviating from the installation position due to swaying and rotation, reduces the need for manual high-altitude correction, and lowers the risk of high-altitude operations.

[0027] Through the above technical solution, the staff adds rust-preventive and protective composite liquid to multiple sets of liquid cylinders 5 in advance through the replenishment pipe 507. When the retaining ring 2 is closed, one end of the retaining ring 2 is in contact with the baffle 503. When the staff closes the retaining ring 2 through the bolt 202, the baffle 503 drives the piston 502 to move inside the liquid cylinder 5 through the slide rod 501. The piston 502 sprays the rust-preventive and protective composite liquid in the liquid cylinder 5 out through the outlet pipe 505 and the pressure valve 506. By spraying the rust-preventive and protective composite liquid onto the surface of the cable, a dense protective film is formed. At the same time, the staff can use the spraying of the rust-preventive and protective composite liquid to help judge the locking status of the retaining ring 2. The described technical solution involves spraying the medium only after the retaining ring 2 is fully closed and the bolt 202 is securely connected. This avoids the ineffective loss of the medium caused by premature or forced spraying, prevents the medium from being blown away by wind or washed away by rain before construction, and also avoids problems such as reduced friction and bolt slippage caused by the medium adhering to the clamping surface of the retaining ring 2 in advance. The rust-proof and protective composite liquid medium adheres to the outer surface of the cable, forming a dense protective film that effectively isolates impurities such as air, water vapor, and dust, preventing the PE sheath of the cable from aging and breaking. At the same time, it can also prevent rust on the exposed metal cable heads and clamps of the cable, preventing corrosion of metal parts. Furthermore, the medium can adhere to the retaining ring 2 to form a rust-proof protective layer.

[0028] Specifically, a steel cable 201 is fixedly connected to the outer surface of the retaining ring 2, and the end of the steel cable 201 away from the retaining ring 2 is fixedly connected to the crane 1.

[0029] Through the above technical solution, the crane 1 is connected to the shackle 2 via the steel cable 201.

[0030] Specifically, the output shafts of multiple hydraulic rods 401 are all fixedly connected to fixed grooves 402, and connecting rods 403 are rotatably embedded inside the multiple fixed grooves 402.

[0031] Through the above technical solution, the hydraulic rod 401 supports the fixed groove 402.

[0032] Specifically, rollers 6 are rotatably mounted on the outer surface of multiple connecting rods 403, and all rollers 6 are made of 45# high-quality carbon structural steel, with polyether-type polyurethane elastomer used as the outer cladding layer.

[0033] The above technical solution uses multiple rollers 6 and hydraulic rods 401 to support the cable.

[0034] Specifically, a replenishment pipe 507 is fixedly connected to one side of the outer surface of multiple liquid cylinders 5, and a threaded cap 508 is threaded onto the outer surface of each replenishment pipe 507.

[0035] Using the above technical solution, staff can add rust-preventive and protective composite liquid to multiple liquid cylinders 5 in advance through the replenishment pipe 507.

[0036] Specifically, a baffle 503 is fixedly connected to one side of the outer surface of multiple slide rods 501, and a spring 504 is wound around the outer surface of multiple slide rods 501.

[0037] With the above technical solution, when the retaining ring 2 is closed, one end of the retaining ring 2 is in contact with the baffle 503.

[0038] In use, after the cable is prepared, the shackle 2 is pulled to the vicinity of the cable by the crane 1. The shackle 2 is then placed on the outer surface of the cable, and the bolt 202 is passed through the shackle 2 to clamp it. This causes the contact pad 3 to adhere to the cable. The contact pad 3 is made of polyester-modified polyurethane elastomer, which has better wear resistance, tear resistance, and aging resistance than ordinary polyurethane. It also maintains good elasticity and a high static friction coefficient. When in flexible contact with the cable's PE sheath, there is no hard compression or scraping, which effectively improves the anti-slip effect between the clamping surface and the cable. It is also resistant to outdoor ultraviolet rays and high and low temperature environments. After repeated clamping, With no permanent plastic deformation and a long service life, the cable is supported by multiple rollers 6 and hydraulic rods 401 after installation. The hydraulic rods 401 also assist in fixing and supporting the cable. Compared to the existing temporary fixing method of wrapping with straps, the shackle 2 uses a full-circumference wrapping structure and achieves rigid locking through bolt 202 closure, replacing the flexible wrapping of straps. This resists the axial and radial forces caused by dynamic alternating loads and wind swaying during cable lifting, preventing relative displacement between the cable and the fixed structure. The bolt closure method, compared to manual wrapping with straps, eliminates the need for operator intervention. Experienced control over tightness reduces human error and ensures consistency in each connection. This solves the problems of slippage and loosening caused by stretching deformation and loose wrapping of the straps, improving the safety of the cable lifting process and eliminating the risk of falls from heights. Simultaneously, the contact pad 3 uses a flexible polyurethane material with high elasticity, high coefficient of friction, and low hardness, forming a flexible contact with the cable's PE protective layer. This avoids the problems of existing straps' synthetic fiber materials being easily cut, or the hard contact with metal rigging causing scratches, dents, and damage to the cable's PE sheath. It protects the cable's anti-corrosion system, preventing corrosion and fatigue damage caused by exposed internal steel strands. At the same time, the high coefficient of friction of polyurethane material can further enhance the static friction between the clamping surface and the cable surface. Combined with the rigid locking of the snap ring 2, multiple sets of hydraulic rods 401 and rollers 6 form an omnidirectional clamping and guiding structure for the cable. This is different from the disadvantage of the tie strap which has no posture constraint and can only achieve simple suspension. This restricts the vertical movement and horizontal sway of the cable. The four sets of rollers 6 work together to constrain the rotation and torsion of the cable around its own axis, ensuring that the cable always maintains the preset posture during the lifting process. This avoids the cable end from deviating from the installation position due to swaying and rotation, reduces the manual high-altitude correction process, and reduces the risk of high-altitude operation.

[0039] Workers pre-fill multiple sets of liquid cylinders 5 with rust-preventive and protective composite liquid through replenishment pipe 507. When the retaining ring 2 is closed, one end of the retaining ring 2 contacts the baffle 503. When the worker closes the retaining ring 2 with bolt 202, the baffle 503 moves the piston 502 inside the liquid cylinder 5 via slide rod 501. The piston 502 sprays the rust-preventive and protective composite liquid in the liquid cylinder 5 out through outlet pipe 505 and pressure valve 506. By spraying the rust-preventive and protective composite liquid onto the surface of the cable, a dense protective film is formed. At the same time, the worker can use the spraying of the rust-preventive and protective composite liquid to help judge the locking status of the retaining ring 2. Through the above technical solution... Only after the retaining ring 2 is fully closed and the bolt 202 is securely connected, the pressure breaks through the pressure valve 506 to spray the medium. This avoids the ineffective loss of medium caused by premature or forced spraying, prevents the medium from being blown away by the wind or washed away by rain before construction, and also avoids problems such as reduced friction and bolt slippage caused by the medium adhering to the clamping surface of the retaining ring 2 in advance. The anti-rust and protective composite liquid medium adheres to the outer surface of the cable, forming a dense protective film that effectively isolates impurities such as air, water vapor, and dust, preventing the PE sheath of the cable from aging and breaking. At the same time, it can also prevent rust on the exposed metal cable head and cable clamp, preventing corrosion of metal parts. The medium can also adhere to the retaining ring 2 to form an anti-rust protective layer.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lifting and relocation mechanical device for replacing cables of a cable-stayed bridge, comprising a crane (1), characterized in that: A fixing component is provided on one side of the crane (1), and a protective component is provided on one side of the crane (1). The fixing component includes a retaining ring (2), and two sets of contact pads (3) are fixedly connected to one side of the inner wall of the retaining ring (2). Multiple bolts (202) are embedded in the internal thread of the retaining ring (2). Multiple fixing plates (4) are fixedly connected to the outer surface of the retaining ring (2), and hydraulic rods (401) are fixedly connected to one side of the outer surface of each of the multiple fixing plates (4). The multiple contact pads (3) are all made of polyester modified polyurethane elastomer material. The protective assembly includes multiple liquid cylinders (5), and each of the multiple liquid cylinders (5) has a sliding rod (501) slidably embedded in the interior in a horizontal direction. A piston (502) is fixedly connected to one side of the outer surface of each of the multiple sliding rods (501). Each of the multiple liquid cylinders (5) has an outlet pipe (505) inside, and each of the multiple outlet pipes (505) has a pressure valve (506) inside.

2. The lifting and relocation machinery for replacing cables of a cable-stayed bridge according to claim 1, characterized in that: A steel cable (201) is fixedly connected to the outer surface of the retaining ring (2), and the end of the steel cable (201) away from the retaining ring (2) is fixedly connected to the crane (1).

3. The lifting and relocation mechanical equipment for replacing cables of a cable-stayed bridge according to claim 1, characterized in that: The output shafts of the plurality of hydraulic rods (401) are fixedly connected to the fixing grooves (402), and the connecting rods (403) are rotatably embedded inside the plurality of fixing grooves (402).

4. The lifting and relocation mechanical equipment for replacing cables of a cable-stayed bridge according to claim 3, characterized in that: Rollers (6) are rotatably mounted on the outer surface of each of the connecting rods (403), and each of the rollers (6) is made of 45# high-quality carbon structural steel. The outer cladding of each of the rollers (6) is made of polyether-type polyurethane elastomer.

5. The lifting and relocation mechanical equipment for replacing cables of a cable-stayed bridge according to claim 1, characterized in that: A liquid replenishment pipe (507) is fixedly connected to one side of the outer surface of the multiple liquid cylinders (5), and a threaded cap (508) is threaded onto the outer surface of the multiple liquid replenishment pipes (507).

6. The lifting and relocation mechanical equipment for replacing cables of a cable-stayed bridge according to claim 1, characterized in that: A baffle (503) is fixedly connected to one side of the outer surface of each of the multiple slide rods (501), and a spring (504) is wound around the outer surface of each of the multiple slide rods (501).

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