Cable-girder anchoring part for steel truss girder cable-stayed bridge with space cable plane

Abstract

The invention discloses a cable beam anchoring part for a steel truss girder cable-stayed bridge with a spatial cable plane, which belongs to the technical field of building construction and comprises a steel anchor cylinder, bearing plates parallel to the steel anchor cylinder are arranged on two sides of the steel anchor cylinder, and anchoring force transmission vertical plates with end parts connected with a steel truss are fixed at opposite ends of the bearing plates; a supporting seat is arranged on the inner wall of the anchoring cylinder, a plurality of step-shaped concave cavities are formed in the end face, facing the steel truss, of the supporting seat, annular seats are movably arranged on the end faces, with the large diameters, of the concave cavities, and locking structures for limiting movement of the annular seats are arranged between the peripheral sides of the annular seats and the concave cavities. A spherical cavity is coaxially formed in the end face, facing the steel truss, of the annular seat, a connecting ball is rotationally arranged in the spherical cavity, a through hole is formed in the connecting ball, and a clamping piece used for clamping a cable body is arranged in the through hole; the method aims to solve the problems that in the welding process, an anchor box is prone to deformation and eccentricity, the anchor box generates radial shearing force on a cable body, and abrasion of the cable body is accelerated.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to an anchor for a cable-stayed bridge cable-stayed beam with a spatial cable-stayed surface steel truss. Background Technology

[0002] The pylon design of spatial cable-stayed bridges is unrestricted, and compared to parallel cable-stayed bridges, they are typically more aesthetically pleasing and imposing. However, in the field of steel truss cable-stayed bridges, the cable-beam anchorage connection is a crucial design element. The function of the cable-beam anchorage structure is to withstand the enormous tensile force of the stay cables and then smoothly transfer this force to the main steel girder. The reliability of this structure directly affects the safety of the entire bridge structure.

[0003] Existing cable-stayed girder anchorage structures include two types: internal and external. The external type mainly uses a double anchor plate-anchor box connection, where cable force is transferred to the steel truss through the welds of the anchor box and its two side force-transmitting vertical plates. This type of structure is simple and easy to maintain, but the welding process can easily cause the anchor box to deform and become eccentric, resulting in radial shear force exerted by the anchor box on the cable body, which accelerates the wear of the cable body. Summary of the Invention

[0004] In view of this, the present invention discloses a cable-stayed bridge anchor for a spatial cable-stayed steel truss girder, the purpose of which is to solve the problem that the anchor box is prone to deformation and eccentricity during the welding process, which causes the anchor box to generate radial shear force on the cable body and accelerates the wear of the cable body.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An anchor for a cable-stayed bridge with a spatial cable-stayed steel truss includes a steel anchor cylinder. Parallel bearing plates are arranged on both sides of the steel anchor cylinder. Anchor force-transmitting vertical plates, whose ends are connected to the steel truss, are fixed to opposite ends of the bearing plates. A support seat is provided on the inner wall of the anchor cylinder. Several stepped cavities are formed on the end face of the support seat facing the steel truss. An annular seat is movably arranged on the end face of the larger diameter cavity. Locking structures restricting the movement of the annular seat are provided between the annular seat and the cavity. A spherical cavity is coaxially formed on the end face of the annular seat facing the steel truss. A connecting ball is rotatably arranged within the spherical cavity. A through hole for the cable to pass through is provided on the connecting ball, and a clamping piece for holding the cable is provided within the through hole.

[0006] In this design, after the anchor tension transmission vertical plate is welded to the steel truss, the annular seat is moved so that it faces the corresponding cable body towards the rear. A locking structure restricts the movement of the annular seat. Then, by rotating the connecting ball, the cable body is ensured to pass through the through hole directly. After installing the clamping plates, the cable body is tensioned. In this design, when welding causes the steel anchor cylinder to tilt, the connecting ball can be adjusted to prevent eccentricity between the connecting ball and the cable body, thus avoiding radial shear force on the cable body. Furthermore, even when long-term use causes deformation of the anchoring structure, the connecting ball can still rotate relative to the spherical cavity to adapt to the deformation, reducing the radial shear force generated by the connecting ball on the cable body. Simultaneously, the force is transmitted from the connecting ball to the steel anchor cylinder through the annular seat and support seat, and then to the steel truss through the bearing plate and anchor tension vertical plate, providing a clear force transmission path and effectively reducing deformation of the anchoring structure.

[0007] Furthermore, the annular seat is hinged with several support rods on its periphery, and each support rod end is coaxially slidably fitted with a sleeve, the sleeve end being hinged to the side wall of the cavity; the end of each support rod located inside the sleeve is coaxially provided with a damping groove, a hydraulic plate is slidably connected in the damping groove, a supporting elastic element is provided between the hydraulic plate and the damping groove, and liquid is sealed between the hydraulic plate and the damping groove; two sets of positioning structures are provided on the side wall of the damping groove symmetrically arranged about the hydraulic plate, when the hydraulic plate slides to face the positioning structure, the positioning structure restricts the hydraulic plate from continuing to slide; a support rod extending from the support rod is fixed to the limiting hydraulic plate, and a locking pin is detachably connected between the end of the support rod and the sleeve.

[0008] In this design, during adjustment, the locking pin is removed and the annular seat is moved. Through the relative sliding and deflection of the support rod and sleeve, the annular seat can move in any direction on the cavity plane. Once the annular seat is in place, the locking pin locks the support rod, thereby locking the hydraulic plate. A certain elastic force is applied to the support rod through the support's elasticity, partially restricting the sliding of the support rod relative to the sleeve. When the anchoring structure is subjected to external vibration or deformation, causing the annular seat to move, the annular seat drives the support rod to slide relative to the sleeve, thereby causing the hydraulic plate to move relative to the support rod, thus absorbing energy and reducing vibration. When the hydraulic plate moves to face the positioning structure, the positioning structure restricts further sliding of the hydraulic plate.

[0009] Furthermore, the positioning structure includes several sliding grooves formed on the side wall of the damping groove. Each sliding groove has an annular block slidably connected coaxially towards the center of the damping groove. A threaded rod, perpendicularly penetrating the support rod, is rotatably connected to the annular block, and the threaded rod is threadedly connected to a sleeve. A positioning pin is slidably disposed coaxially inside each annular block, and a reset elastic element is provided between the positioning pin and the annular block. The hydraulic plate has an arc-shaped edge, and positioning grooves that mate with the positioning pins are provided on the side wall of the hydraulic plate. Guide grooves are formed on both sides of the damping groove, and a limiting pin with an arc-shaped end is slidably connected within each guide groove, extending into the positioning groove. A reset elastic element is also provided between the limiting pin and the guide groove.

[0010] In this design, initially, the limiting pin is inserted into the positioning groove, restricting the movement of the hydraulic plate relative to the support rod. When the anchoring structure is subjected to external vibration or deformation, causing the annular seat to move, the hydraulic plate presses against the limiting pin and the corresponding reset elastic element, causing the limiting pin to slide into the guide groove, thereby allowing the hydraulic plate to move relative to the support rod. When the hydraulic plate moves to face the positioning structure, it presses the positioning pin into the slide groove until the positioning groove is aligned with the positioning pin. At this point, the positioning pin, under the action of the reset elastic element, inserts into the positioning groove, locking the hydraulic plate and restricting its sliding relative to the support rod, thus restricting the movement of the support rod relative to the sleeve. Furthermore, the sliding distance of the hydraulic plate can be adjusted by rotating the corresponding threaded rod, which, through the annular block, drives the corresponding positioning pin to slide completely into the slide groove, ensuring that only the end of the positioning pin at the hydraulic plate's extreme position protrudes from the slide groove.

[0011] Furthermore, each of the annular seats can be detachably connected to a cover plate, and each cover plate is provided with a groove for the end of the connecting ball to be exposed.

[0012] Furthermore, the spherical cavity sidewall is provided with several guide grooves facing its axis, and each guide groove is slidably connected with a positioning rod. One end of the positioning rod is fixed with a traction cable connected to the connecting ball, and the other end of the positioning rod extends out of the annular seat and is threadedly connected with a positioning ring.

[0013] Furthermore, rubber sealing rings are provided on the periphery of the threaded rod.

[0014] Furthermore, each of the positioning rings is provided with a rubber pad layer.

[0015] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a longitudinal sectional view of the annular seat in an embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 This is a cross-sectional view of the annular seat in an embodiment of the present invention.

[0017] The following components are labeled in the attached diagram: 1. Steel anchor cylinder; 2. Pressure plate; 3. Anchor force transmission vertical plate; 4. Support seat; 5. Ring seat; 6. Connecting ball; 7. Cable body; 8. Clamping piece; 9. Support rod; 10. Sleeve; 11. Hydraulic plate; 12. Support elastic element; 13. Support rod; 14. Locking pin; 15. Ring block; 16. Positioning pin; 17. Threaded rod; 18. Positioning groove; 19. Limiting pin; 20. Cover plate; 21. Positioning rod; 22. Traction cable; 23. Positioning ring; 24. Reset elastic element. Detailed Implementation

[0018] like Figures 1-5 As shown: An anchor for a cable-stayed bridge with a spatial cable-stayed steel truss includes a steel anchor cylinder 1. Two parallel bearing plates 2 are arranged on both sides of the steel anchor cylinder 1. An anchor force-transmitting vertical plates 3, whose ends are connected to the steel truss, are fixed to opposite ends of the bearing plates 2. A support seat 4 is provided on the inner wall of the anchor cylinder. Several stepped cavities are formed on the end face of the support seat 4 facing the steel truss. An annular seat 5 is movably arranged on the end face of the cavity with the larger diameter. Locking structures restricting the movement of the annular seat 5 are provided between the periphery of the annular seat 5 and the cavity. A spherical cavity is coaxially formed on the end face of the annular seat 5 facing the steel truss. A connecting ball 6 is rotatably arranged within the spherical cavity. A through hole for the cable body 7 to pass through is provided on the connecting ball 6. A clamping piece 8 for clamping the cable body 7 is provided within the through hole (the clamping piece is a conventional technique in this field and is not described in detail).

[0019] In this scheme, after the anchor tension transmission vertical plate 3 is welded to the steel truss, the annular seat 5 is moved so that it faces the corresponding cable 7 backward. The movement of the annular seat 5 is restricted by a locking structure. Then, the connecting ball 6 is rotated to ensure that the cable 7 can pass through the through hole. After the clamping plate 8 is installed, the cable 7 is tensioned. In this scheme, when the welding causes the steel anchor cylinder 1 to tilt, the connecting ball 6 can be adjusted to avoid the connecting ball 6 being eccentric with the cable 7 and generating radial shear force on the cable 7. In addition, when the anchoring structure deforms due to long-term use, the connecting ball 6 can still rotate relative to the spherical cavity to adapt to the deformation, reducing the radial shear force generated by the connecting ball 6 on the cable 7. At the same time, the connecting ball 6 transmits force to the steel anchor cylinder 1 through the annular seat 5 and the support seat 4, and then to the steel truss through the bearing plate 2 and the anchor tension vertical plate, which has a clear force transmission path and effectively reduces the deformation of the anchoring structure.

[0020] In this embodiment, a plurality of support rods 9 are hinged to the periphery of the annular seat 5. Each end of the support rod 9 is coaxially slidably fitted with a sleeve 10, and the end of the sleeve 10 is hinged to the side wall of the cavity. The end of the support rod 9 located inside the sleeve 10 is coaxially provided with a damping groove. A hydraulic plate 11 is slidably connected in the damping groove. A supporting elastic element 12 is provided between the hydraulic plate 11 and the damping groove. Liquid is sealed between the hydraulic plate 11 and the damping groove. Two sets of positioning structures are provided on the side wall of the damping groove, which are symmetrically arranged about the hydraulic plate 11. When the hydraulic plate 11 slides to face the positioning structure, the positioning structure restricts the hydraulic plate 11 from continuing to slide. A support rod 13 extending out of the support rod 9 is fixed on the limiting hydraulic plate 11. A locking pin 14 is detachably connected between the end of the support rod 13 and the sleeve 10.

[0021] In this design, during adjustment, the locking pin 14 is removed and the annular seat 5 is moved. Through the relative sliding and deflection of the support rod 9 and the sleeve 10, the annular seat 5 can move in any direction on the cavity plane. Once the annular seat 5 is in place, the locking pin 14 locks the support rod 13, thereby locking the hydraulic plate 11. A certain elastic force is applied to the support rod 9 through the support's elasticity, partially restricting the sliding of the support rod 9 relative to the sleeve 10. When the anchoring structure is subjected to external vibration or deformation, causing the annular seat 5 to move, the annular seat 5 drives the support rod 9 to slide relative to the sleeve 10, thereby causing the hydraulic plate 11 to move relative to the support rod 9, thus absorbing energy and reducing vibration. When the hydraulic plate 11 moves to face the positioning structure, the positioning structure restricts the hydraulic plate 11 from continuing to slide.

[0022] In this embodiment, the positioning structure includes several sliding grooves formed on the side wall of the damping groove. Each sliding groove has an annular block 15 slidably connected coaxially to the center of the damping groove. A threaded rod 17, perpendicularly penetrating the support rod 9, is rotatably connected to the annular block 15. The threaded rod 17 is threadedly connected to the sleeve 10. A positioning pin 16 is slidably arranged coaxially inside each annular block 15. A reset elastic element 24 is provided between the positioning pin 16 and the annular block 15. The hydraulic plate 11 has an arc-shaped edge, and each side wall of the hydraulic plate 11 has a positioning groove 18 that mates with the positioning pin 16. Guide grooves are formed on both sides of the damping groove. A limiting pin 19, extending into the positioning groove 18 and with an arc-shaped end, is slidably connected within each guide groove. A reset elastic element 24 is also provided between the limiting pin 19 and the guide groove.

[0023] In this design, initially, the limiting pin 19 is inserted into the positioning groove 18, restricting the movement of the hydraulic plate 11 relative to the support rod 9. When the anchoring structure is subjected to external vibration or deformation, causing the annular seat 5 to move, the hydraulic plate 11 presses against the limiting pin 19 and the corresponding reset elastic element 24, causing the limiting pin 19 to slide into the guide groove, thereby allowing the hydraulic plate 11 to move relative to the support rod 9. When the hydraulic plate 11 moves to face the positioning structure, it presses the positioning pin 16 into the slide groove until the positioning groove 18 faces the positioning pin 16. Under the action of the reset elastic element 24, the positioning pin 16 is inserted into the positioning groove 18, locking the hydraulic plate 11 and restricting its sliding relative to the support rod 9, thereby restricting the movement of the support rod 9 relative to the sleeve 10. Furthermore, the sliding distance of the hydraulic plate 11 can be adjusted by rotating the corresponding threaded rod 17, which, through the annular block 15, drives the corresponding positioning pin 16 to slide completely into the slide groove. It is only necessary to keep the end of the positioning pin 16 at the extreme position of the hydraulic plate 11 protruding from the slide groove.

[0024] In this embodiment, each of the annular seats 5 is detachably connected to a cover plate 20, and each cover plate 20 is provided with a groove for the end of the connecting ball 6 to be exposed.

[0025] The cover plate 20 is used to protect the connecting ball 6.

[0026] In this embodiment, a plurality of guide grooves facing the axis are provided on the side wall of the spherical cavity. A positioning rod 21 is slidably connected to each guide groove. One end of the positioning rod 21 is fixed with a traction cable 22 connected to the connecting ball 6. The other end of the positioning rod 21 extends out of the annular seat 5 and is threadedly connected with a positioning ring 23.

[0027] When the connecting ball 6 rotates, it slides in the guide groove via the traction cable 22. By rotating the positioning ring 23 until it abuts against the annular seat 5, the traction cable 22 is kept taut, thus limiting the continued rotation of the connecting ball 6 and preventing it from rotating excessively.

[0028] In this embodiment, rubber sealing rings are provided on all sides of the threaded rod 17.

[0029] Liquid leakage is prevented by installing rubber sealing rings.

[0030] In this embodiment, each positioning ring 23 is provided with a rubber pad layer.

[0031] By adding a rubber pad, wear on the positioning ring 23 is reduced.

[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A cable-stayed bridge anchorage for a spatial cable-stayed steel truss bridge, characterized in that: The system includes a steel anchor cylinder with parallel bearing plates on both sides. Anchor plates with connecting ends to a steel truss are fixed to opposite ends of the bearing plates. A support seat is provided on the inner wall of the anchor cylinder. Several stepped cavities are formed on the end face of the support seat facing the steel truss. An annular seat is movably mounted on the end face of the larger diameter cavity. Locking structures restricting the movement of the annular seat are provided between the annular seat and the cavity. A spherical cavity is coaxially formed on the end face of the annular seat facing the steel truss. A connecting ball is rotatably mounted within the spherical cavity. A through hole for the cable to pass through is provided on the connecting ball, and a clamping piece for holding the cable is provided within the through hole.

2. The cable-stayed bridge anchorage for a spatial cable-stayed steel truss girder according to claim 1, characterized in that: The annular seat is hinged with several support rods on its periphery. Each support rod has a sleeve slidably fitted onto its end, and the sleeve end is hinged to the side wall of the cavity. The end of each support rod located inside the sleeve has a damping groove slidably formed. A hydraulic plate is slidably connected inside the damping groove. Supporting elastic elements are provided between the hydraulic plate and the damping groove, and liquid is sealed between the hydraulic plate and the damping groove. Two sets of positioning structures are provided on the side wall of the damping groove, symmetrically arranged about the hydraulic plate. When the hydraulic plate slides to face the positioning structure, the positioning structure restricts the hydraulic plate from sliding further. A support rod extending from the support rod is fixed to the limiting hydraulic plate, and a locking pin is detachably connected between the end of the support rod and the sleeve.

3. The cable-stayed bridge anchorage for a spatial cable-stayed steel truss girder according to claim 2, characterized in that: The positioning structure includes several sliding grooves formed on the side wall of the damping groove. Each groove has a coaxially slidably connected annular block facing the center of the damping groove. A threaded rod, perpendicularly penetrating a support rod, is rotatably connected to each annular block, and the threaded rod is threadedly connected to a sleeve. A positioning pin is coaxially slidably disposed inside each annular block, and a reset elastic element is disposed between the positioning pin and the annular block. The hydraulic plate has an arc-shaped edge, and positioning grooves that mate with the positioning pins are provided on the side wall of the hydraulic plate. Guide grooves are formed on both sides of the damping groove, and a limiting pin with an arc-shaped end is slidably connected within each guide groove, extending into the positioning groove. A reset elastic element is also disposed between the limiting pin and the guide groove.

4. The cable-stayed bridge anchorage for a spatial cable-stayed steel truss girder according to claim 3, characterized in that: Each of the annular seats can be detachably connected to a cover plate, and each cover plate is provided with a groove for the end of the connecting ball to be exposed.

5. The cable-stayed bridge anchorage for a spatial cable-stayed steel truss girder according to claim 4, characterized in that: The spherical cavity has several guide grooves facing its axis on its sidewall. Each guide groove is slidably connected to a positioning rod. One end of each positioning rod is fixed with a traction cable connected to the connecting ball, and the other end of each positioning rod extends out of the annular seat and is threadedly connected to a positioning ring.

6. The cable-stayed bridge anchorage for a spatial cable-stayed steel truss girder according to claim 5, characterized in that: The threaded rod is provided with rubber sealing rings on all sides.

7. The cable-stayed bridge anchorage for a spatial cable-stayed steel truss girder according to claim 6, characterized in that: Each of the positioning rings is provided with a rubber pad layer.

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