High-toughness cable beam anchoring structure for composite beam cable-stayed bridge and construction method

Abstract

The invention discloses a high-toughness cable beam anchoring structure for a composite beam cable-stayed bridge and a construction method.The high-toughness cable beam anchoring structure comprises a steel anchor pipe, a force transmission web, a supporting and reinforcing assembly, a steel main beam outer web and an anchor backing plate, the anchor backing plate is welded to the bottom end of the steel anchor pipe, and a plurality of anchor pipe local stiffening ribs are welded to the outer side wall of the steel anchor pipe and welded to the anchor backing plate; the two side walls of the force transmission web are welded to the steel anchor pipe and the steel main beam outer web correspondingly, the supporting reinforcing assembly is welded to the steel anchor pipe, the force transmission web and the steel main beam outer web correspondingly, and the steel main beam outer web reinforcing assembly is welded to the inner side of the steel main beam outer web. An inhaul cable anchoring point is lowered to the lower middle portion of the main beam, stress concentration and tensile stress of a concrete bridge deck in an anchoring area are reduced, the overall toughness of a combined beam bridge deck system is improved, the steel anchor pipe and the cable guide pipe incline in the transverse bridge direction, an outer web of the steel main beam is an inclined web, bevel edge cutting of a force transmission web adapts to the inclination angle of the inhaul cable, and the transverse eccentric distance of the anchoring point is reduced; additional bending moment and stress are reduced, and stability in a complex stress environment is enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridges, and more specifically, relates to a high-toughness cable-beam anchoring structure and a construction method for a composite-beam cable-stayed bridge. Background Art

[0002] In the construction of composite-girder cable-stayed bridges, the anchoring method of the cable stays on the steel main girder is a critical structural element, directly related to the stability and durability of the bridge. Traditionally, this anchoring method is mainly divided into two categories: anchor plate structure and steel anchor box structure.

[0003] The anchor plate structure is currently a widely used method. Its basic construction involves welding an anchor plate to the top plate of the steel main beam, to which the diagonal cables are then anchored. The advantages of this structure lie in its direct force transmission path and its relatively mature technology, developed through years of engineering practice. However, it also presents some significant challenges. First, significant stress concentration occurs in the bridge deck area where the anchor plate is anchored, which can easily lead to diagonal cracks in the concrete deck at the anchoring location, compromising the structural integrity of the bridge. Second, gaps are prone to forming at the interface between the anchor plate and the concrete deck. Rainwater can penetrate through these gaps, particularly during rainy weather, accelerating corrosion of the steel main beam and reducing the durability of the structure. Furthermore, when the steel main beam needs to be transported by road, the anchor plate is often transported separately from the main beam due to height restrictions, and then welded on-site. However, the weld quality of on-site welding often falls short of the high standards of factory welding, which undoubtedly increases structural safety risks. Furthermore, when the stay cables have a transverse inclination, the anchor plates need to be tilted accordingly to accommodate this inclination. This not only increases construction difficulty but can also compromise the quality of the welds connecting the anchor plates to the top plate of the steel main beam. Finally, the cable anchorage area of ​​the anchor plates is a stress concentration zone, which is difficult to completely avoid through design, further threatening the safety of the bridge.

[0004] The steel anchor box structure is also a common cable-girder anchoring method in composite girder cable-stayed bridges. Its basic structure is to weld a box-shaped structure to the web on the outside of the main girder, and the diagonal cables are anchored to this steel box. This structure also has some problems. First, similar to the anchor plate structure, the bridge deck area where the steel anchor box is anchored will also experience significant stress concentration, which can easily cause diagonal cracks in the concrete bridge deck in the anchor area. Secondly, the structure of the steel anchor box is relatively complex, which not only makes the manufacturing process more cumbersome, but also affects the overall aesthetics of the bridge because the steel anchor box is usually exposed on the outside of the steel beam. In addition, the internal space of the steel anchor box is small, which brings many inconveniences to the installation of the cables and also makes the subsequent maintenance and inspection of the steel anchor box difficult to carry out smoothly.

[0005] With the continuous development of bridge technology, modern bridge design focuses on improving the overall toughness of bridge structures while ensuring structural safety and reliability. For composite beam cable-stayed bridges, traditional cable-beam anchorage structures often lack comprehensive consideration of the overall mechanical properties of the composite beam, which to some extent restricts the improvement of the overall structural toughness. Therefore, there is an urgent need to design a new cable-beam anchorage structure for composite beam cable-stayed bridges. This new structure should have broad applicability, simple construction, easy construction, safety, and cost-effectiveness, while effectively improving the overall structural toughness. Summary of the Invention

[0006] In response to the above defects or improvement needs of the prior art, the present invention provides a high-toughness cable-beam anchoring structure and construction method for a composite beam cable-stayed bridge. By tilting the steel anchor pipe and the cable guide pipe along the transverse direction of the bridge, the outer web of the steel main beam is set as an inclined web inclined toward the inner side of the steel main beam, and the welding side of the force transmission web and the steel anchor pipe is cut into an oblique edge along the inclined direction of the steel anchor pipe to adapt to the lateral inclination angle of the cable, reduce the lateral eccentricity of the cable anchor point relative to the steel main beam, and thus reduce the additional bending moment, and finally reduce the additional stress of the anchoring structure, thereby improving the overall toughness of the anchoring structure, enhancing its stability and reliability in complex stress environments, and providing a strong guarantee for the safe operation of the entire bridge structure.

[0007] To achieve the above-mentioned object, according to one aspect of the present invention, a high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge is provided, comprising a steel anchor pipe, a force-transmitting web, a support reinforcement assembly, a steel main beam outer web, and an anchor pad; wherein,

[0008] An anchor plate (5) is welded to the bottom end of the steel anchor pipe (1), and the anchor plate (5) is located in the middle and lower part of the side of the steel main beam, which reduces the anchor point of the cable, reduces the tensile stress of the concrete bridge deck in the anchoring area, improves the overall toughness of the composite beam bridge deck system, and facilitates maintenance using an off-beam inspection vehicle without affecting traffic, thereby improving the convenience of maintenance;

[0009] The outer side wall of the bottom end of the steel anchor pipe is welded with a plurality of anchor pipe local stiffening ribs, and the plurality of anchor pipe local stiffening ribs are welded to the anchor pad. The two side walls of the force transmission web are respectively welded to the steel anchor pipe and the outer web of the steel main beam. The support reinforcement assembly is respectively welded to the steel anchor pipe, the force transmission web and the outer web of the steel main beam. The inner side of the outer web of the steel main beam is welded with a steel main beam outer web reinforcement assembly to enhance the stability of the outer web of the steel main beam.

[0010] The steel anchor pipe and cable guide tube are inclined along the transverse direction of the bridge, the outer web of the steel main beam is an inclined web inclined toward the inner side of the steel main beam, and the welding side of the force transmission web and the steel anchor pipe is cut into an oblique edge along the inclination direction of the steel anchor pipe to adapt to the transverse inclination angle of the cable, reduce the transverse eccentricity of the cable anchor point relative to the steel main beam, and thus reduce the additional bending moment, and finally reduce the additional stress of the anchoring structure, thereby improving the overall toughness of the anchoring structure and enhancing its stability and reliability in complex stress environments.

[0011] Furthermore, when the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the support reinforcement assembly includes a first support stiffening rib, a second support stiffening rib and a third support stiffening rib, and the first support stiffening rib, the second support stiffening rib and the third support stiffening rib are welded to the steel anchor pipe, the force transmission web and the outer web of the steel main beam in sequence from top to bottom, and the first support stiffening rib, the second support stiffening rib and the third support stiffening rib are perpendicular to the force transmission web and the outer web of the steel main beam;

[0012] The first supporting stiffening rib is a whole plate, the bottom of which is welded to the upper end of the force transmission web, and the two sides are welded to the outer web of the steel main beam and the steel anchor pipe. The second supporting stiffening rib is two plates, which are welded to the two side walls of the force transmission web, and are welded to the outer web of the steel main beam and the steel anchor pipe, and the intersection with the force transmission web is located at the cross diaphragm of the steel main beam. Through-welding holes are provided at the welding corners of the second supporting stiffening rib, the outer web of the steel main beam, the steel anchor pipe and the force transmission web. The third supporting stiffening rib is two plates, which are welded to the two side walls of the force transmission web, and are welded to the outer web of the steel main beam, the local stiffening rib of the anchor pipe and the steel anchor pipe. Through-welding holes are provided at the welding corners of the third supporting stiffening rib, the outer web of the steel main beam, the steel anchor pipe and the force transmission web.

[0013] Furthermore, when the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, the support reinforcement assembly also includes a fourth support stiffening rib, which is two plates welded to the two side walls of the force transmission web, and welded to the steel anchor pipe and the outer web of the steel main beam. Through-welding holes are provided at the welding corners of the fourth support stiffening rib and the outer web of the steel main beam, the steel anchor pipe and the force transmission web.

[0014] Furthermore, when the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, the steel main beam outer web reinforcement assembly includes a first steel main beam outer web stiffening rib, and the first steel main beam outer web stiffening rib is provided with two pieces, which are respectively located on the inner side of the steel main beam outer web at the position of the first supporting stiffening rib, and a gap is reserved between the steel main beam top plate without welding.

[0015] Furthermore, when the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the steel main beam outer web reinforcement assembly also includes a second steel main beam outer web stiffening rib, and the second steel main beam outer web stiffening rib is provided with two pieces, which are respectively located on the inner side of the steel main beam outer web at the positions of the second supporting stiffening rib and the third supporting stiffening rib, and are welded to the steel main beam bottom plate.

[0016] Furthermore, a cable guide tube is welded to the top of the steel anchor tube, and its inner diameter is the same as that of the steel anchor tube, and its outer diameter is smaller than that of the steel anchor tube, thereby avoiding the steel anchor tube being arranged from the bottom to the upper end of the cable guide tube.

[0017] Furthermore, a waterproof cover is provided at the end of the cable conduit.

[0018] Furthermore, a circular hole is opened in the middle of the anchor plate, the size of the circular hole is determined according to the type of the cable, and the center axis of the anchor plate coincides with the center axis of the steel anchor pipe.

[0019] Furthermore, the distance between the second supporting stiffening rib and the third supporting stiffening rib is 250 mm, so that the third supporting stiffening rib is closer to the anchor plate, reducing the local stress concentration of the steel anchor pipe at the anchoring end.

[0020] According to a second aspect of the present invention, a construction method for a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge is provided, which is implemented using the high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge, comprising:

[0021] S100: Complete the manufacturing of the steel main beam segments and the cable-beam anchorage structure components in the factory;

[0022] S200: Weld the anchor plate to the steel anchor pipe, weld the force transfer web to the outer web of the steel main beam, then weld the steel anchor pipe to the force transfer web, and weld the cable guide to the top of the steel anchor pipe;

[0023] S300: According to the design drawings, when the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, weld the first supporting stiffener, the second supporting stiffener, the third supporting stiffener, and the fourth supporting stiffener to corresponding positions of the steel anchor pipe, the force transmission web, and the outer web of the steel main beam, and weld the first steel main beam outer web stiffener to corresponding positions on the inner side of the outer web of the steel main beam;

[0024] S400: According to the design drawings, when the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, weld the first supporting stiffener, the second supporting stiffener, and the third supporting stiffener to corresponding positions of the steel anchor pipe, the force transmission web, and the outer web of the steel main beam, weld the first steel main beam outer web stiffener and the second steel main beam outer web stiffener to corresponding positions on the inner side of the steel main beam outer web, and weld the second steel main beam outer web stiffener to the bottom plate of the steel main beam;

[0025] S500: Weld the local stiffening ribs of the anchor pipe to the steel anchor pipe and the anchor plate at equal intervals and vertically, and weld the two local stiffening ribs of the anchor pipe facing inward to the third supporting stiffening rib.

[0026] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0027] 1. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge of the present invention lowers the cable anchorage point by placing the anchor pad in the middle and lower part of the side of the steel main beam, reduces the tensile stress of the concrete bridge deck in the anchorage area, and improves the overall toughness of the composite beam bridge deck system. At the same time, it can also be conveniently inspected and maintained using an off-beam inspection vehicle without affecting traffic, thereby improving the convenience of inspection.

[0028] 2. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge of the present invention tilts the steel anchor pipe and the cable guide pipe along the transverse direction of the bridge, sets the outer web of the steel main beam as an inclined web inclined toward the inner side of the steel main beam, and cuts the welding side of the force-transmitting web and the steel anchor pipe into an oblique edge along the inclined direction of the steel anchor pipe to adapt to the lateral inclination angle of the cable, reduce the lateral eccentricity of the cable anchor point relative to the steel main beam, and further reduce the additional bending moment, and finally reduce the additional stress of the anchoring structure, thereby improving the overall toughness of the anchoring structure, enhancing its stability and reliability in complex stress environments, and providing a strong guarantee for the safe operation of the entire bridge structure.

[0029] 3. The high-toughness cable-beam anchorage structure for a composite-beam cable-stayed bridge of the present invention fully considers the effect of changes in the angle θ between the cable and the horizontal plane on the stress characteristics of the anchorage structure. Since the angle θ between the cable and the horizontal plane varies at different locations, the stress conditions of the anchorage structure at different locations also vary significantly. To accommodate this variation, the support reinforcement assembly and the steel main beam outer web reinforcement assembly are optimized for different angle ranges. When the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, the support reinforcement assembly includes a first support stiffener, a second support stiffener, a third support stiffener, and a fourth support stiffener. Simultaneously, the steel main beam outer web reinforcement assembly includes a first steel main beam outer web stiffener, which can effectively address the stress characteristics at smaller angles and ensure the stability of the structure in the horizontal and vertical directions. When the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the support reinforcement assembly includes a first support stiffener, a second support stiffener, and a third support stiffener. The steel main beam outer web reinforcement assembly includes the first steel main beam outer web stiffening rib and the second steel main beam outer web stiffening rib, which are optimized for the stress characteristics at larger angles, thereby enhancing the bearing capacity of the structure under vertical loads and lateral forces. By rationally arranging stiffening ribs and reinforcement components, material usage is saved, project costs are reduced, and dual optimization of structural performance and economy is achieved, making the structural stress more reasonable, effectively dispersing the load, reducing stress concentration, and improving the fatigue resistance and overall stability of the anchoring structure.

[0030] 4. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge of the present invention adopts an arc shape at the end of the force-transfer web to effectively disperse stress and avoid stress concentration caused by sharp transitions. The force-transfer web is only welded to the outer web of the steel main beam and the steel anchor pipe, and is not connected to the top plate and bottom plate of the steel main beam, thereby further optimizing the load transfer path and reducing deformation and fatigue damage of the top and bottom plates due to local stress. Anchor stiffening ribs and third support stiffening ribs are arranged at the bottom end of the steel anchor pipe to enhance the stiffness and bearing capacity of the steel anchor pipe, effectively disperse the anchoring force, reduce the risk of stress concentration, improve the fatigue toughness of the anchoring structure, extend the service life of the structure, and at the same time improve the reliability and stability of the structure under complex working conditions.

[0031] 5. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge of the present invention, by arranging a cable guide tube at the non-main force-transmitting part of the top end of the steel anchor tube, not only facilitates the arrangement of auxiliary components such as a waterproof cover and a cable damper, but also achieves dual optimization of materials and costs by optimizing the size of the cable guide tube. The inner diameter of the cable guide tube is consistent with the steel anchor tube, ensuring that the cable can pass smoothly and achieve a good force transmission effect; while its outer diameter is designed to be smaller than the steel anchor tube. This size difference effectively reduces the amount of material used while meeting functional requirements, thereby significantly reducing the manufacturing cost of the structure. On the other hand, it effectively avoids the steel anchor tube being arranged from the bottom to the upper end of the cable guide tube, thereby greatly reducing the length of the steel anchor tube used while ensuring structural performance and function, saving not only a large amount of steel, but also significantly reducing the overall material cost, thereby effectively reducing the cost of the entire structure, and also allowing the steel anchor tube to be located below the bridge deck, improving the aesthetics of the structure, and facilitating subsequent inspection and maintenance operations.

[0032] 6. The high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge of the present invention increases the size of the weld holes at the connection positions between the force-transmitting web and the supporting stiffening ribs and the outer web of the steel main beam. This not only facilitates the smooth passage of rainwater and debris, thus avoiding corrosion problems caused by accumulation of water and debris, but also effectively improves the corrosion resistance and toughness of the anchorage structure, reduces the maintenance cost caused by corrosion, and ensures the stability and safety of the anchorage structure during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic elevational structural diagram of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention, wherein the angle θ between the cables and the horizontal plane satisfies 45°<θ<90°;

[0034] Figure 2 This is a schematic side structural diagram of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention, wherein the angle θ between the cables and the horizontal plane satisfies 45°<θ<90°;

[0035] Figure 3 This is an axonometric view along a steel anchor pipe, wherein the angle θ between the cables and the horizontal plane satisfies 45°<θ<90° for a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of a first supporting stiffening rib structure of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of a second supporting stiffening rib structure of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of a third supporting stiffening rib structure of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of a fourth supporting stiffening rib structure of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0040] Figure 8 This is a bottom view of a steel anchor pipe for a high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0041] Figure 9 This is a schematic diagram of the outer web stiffening rib structure of the first steel main beam of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0042] Figure 10 This is a schematic diagram of the outer web stiffening rib structure of the first steel main beam of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0043] Figure 11 This is a schematic diagram of a force-transmitting web structure of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0044] Figure 12 This is a schematic elevational structural diagram of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention, wherein the angle θ between the cables and the horizontal plane satisfies 0°<θ≤45°;

[0045] Figure 13 This is a schematic side structural diagram of a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention, wherein the angle θ between the cables and the horizontal plane satisfies 0°<θ≤45°;

[0046] Figure 14 This is an axonometric view along a steel anchor pipe, wherein the angle θ between the cables and the horizontal plane satisfies 0°<θ≤45° for a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge according to an embodiment of the present invention;

[0047] Figure 15 The present invention is a flowchart of a construction method for a high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to an embodiment of the present invention.

[0048] In all the drawings, the same figure marks represent the same technical features, specifically: 1-steel anchor pipe, 2-cable guide tube, 3-force transmission web, 4-support reinforcement assembly, 41-first supporting stiffening rib, 42-second supporting stiffening rib, 43-third supporting stiffening rib, 44-fourth supporting stiffening rib, 5-anchor plate, 6-anchor pipe local stiffening rib, 7-steel main beam outer web reinforcement assembly, 71-first steel main beam outer web stiffening rib, 72-second steel main beam outer web stiffening rib, 8-steel main beam outer web, 9-waterproof cover. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] In this patent, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0053] Example 1

[0054] like Figure 1-14 As shown, an embodiment of the present invention provides a high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge, comprising a steel anchor tube 1, a force-transmitting web 3, a support reinforcement assembly 4, a steel main beam outer web 8, and an anchor pad 5. The bottom end of the steel anchor tube 1 is welded with an anchor pad 5, and the two side walls of the force-transmitting web 3 are respectively welded to the steel anchor tube 1 and the steel main beam outer web 8. The support reinforcement assembly 4 is respectively welded to the steel anchor tube 1, the force-transmitting web 3, and the steel main beam outer web 8. The lower end of the steel anchor tube 1 is welded with a plurality of anchor tube local stiffening ribs 6. The present invention forms an efficient load transfer and support system through the synergistic effect of the steel anchor tube 1, the force-transmitting web 3, the support reinforcement assembly 4, the steel main beam outer web 8, and the anchor pad 5. The steel anchor tube 1 serves as the core load-bearing component, and the anchor pad 5 welded to its lower end directly bears the external load. The anchor tube local stiffening ribs 6 enhance the anti-buckling capacity and evenly distribute the stress to the tube wall. The two sides of the force-transfer web 3 are welded to the steel anchor pipe 1 and the outer web 8 of the steel main beam, respectively, to form a continuous force-transfer path, effectively restraining the lateral displacement of the steel anchor pipe and ensuring that the load is smoothly transferred to the main beam structure. The support reinforcement component 4 is connected to the steel anchor pipe 1, the force-transfer web 3 and the outer web 8 of the steel main beam by welding to construct a three-dimensional stability system, significantly improving the shear and bending stiffness of the node and enhancing the seismic performance of the structure under dynamic loads. As part of the main structure, the outer web 8 of the steel main beam not only bears the load transmitted by the force-transfer web 3, but also maintains the geometric integrity of the cross-section together with other components to prevent local deformation from affecting the overall mechanical properties. Through a clear force-transfer path and multi-point anchoring technology, the load is gradually dispersed and coordinated with each other, which not only improves construction efficiency, but also effectively reduces the risk of fatigue damage through local reinforcement and spatial constraint design.

[0055] The anchor pad (5) is located at the middle and lower part of the side of the rigid main beam, which reduces the anchoring point of the cable, reduces the tensile stress of the concrete bridge deck in the anchoring area, improves the overall toughness of the composite beam bridge deck system, and facilitates maintenance using an off-beam inspection vehicle without affecting traffic, thereby improving the convenience of maintenance.

[0056] Furthermore, a cable guide tube 2 is welded to the upper end of the steel anchor tube 1, and its inner diameter is the same as that of the steel anchor tube 1, and its outer diameter is smaller than the outer diameter of the steel anchor tube 1, which effectively avoids the steel anchor tube 1 being arranged from the bottom all the way to the upper end of the cable guide tube 2, thereby greatly reducing the use length of the steel anchor tube 1 while ensuring the structural performance and function, which not only saves a lot of steel, but also significantly reduces the overall material cost, thereby effectively reducing the cost of the entire structure. On the other hand, the steel anchor tube 1 is located below the bridge deck, which not only improves the aesthetics of the structure, but also facilitates subsequent inspection and maintenance operations.

[0057] Furthermore, the steel anchor tube 1 and the cable guide tube 2 are inclined along the transverse direction of the bridge, the outer web 8 of the steel main beam is an inclined web inclined toward the inner side of the steel main beam, and the welding side of the force transmission web 3 and the steel anchor tube 1 is cut into a bevel along the inclined direction of the steel anchor tube 1 to adapt to the transverse inclination angle of the cable 9, reduce the transverse eccentricity of the cable anchor point relative to the steel main beam, and thus reduce the additional bending moment, and finally reduce the additional stress of the anchoring structure, improve the overall toughness of the anchoring structure, enhance its stability and reliability in complex stress environments, and provide a strong guarantee for the safe operation of the entire bridge structure.

[0058] Furthermore, a waterproof cover 9 is provided at the end of the cable conduit 2, which can effectively prevent external moisture from entering the interior of the cable conduit 2, extend the service life, and prevent chemical corrosion.

[0059] Furthermore, a circular hole is opened in the middle of the anchor plate 5, the size of the circular hole is determined according to the cable model, and the anchor plate 5 coincides with the central axis of the steel anchor pipe 1; the precise size matching of the circular hole can ensure uniform force between the cable and the anchor plate 5, avoid stress concentration, and optimize the mechanical properties of the anchoring system. The anchor plate 5 coincides with the central axis of the steel anchor pipe 1, effectively reducing the additional bending moment and stress caused by eccentric force, and significantly improving the stability and safety of the structure.

[0060] Furthermore, when the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the support reinforcement assembly 4 includes a first support stiffening rib 41, a second support stiffening rib 42 and a third support stiffening rib 43, and the first support stiffening rib 41, the second support stiffening rib 42 and the third support stiffening rib 43 are welded to the steel anchor pipe 1, the force transmission web 3 and the steel main beam outer web 8 in sequence from top to bottom, and the first support stiffening rib 41, the second support stiffening rib 42 and the third support stiffening rib 43 are welded to the force transmission web 3 It is perpendicular to the outer web 8 of the steel main beam; it can enhance the structural stability, effectively disperse the vertical component of the cable, avoid local stress concentration, improve fatigue resistance, reduce fatigue stress caused by cable vibration and dynamic loads, optimize the force transmission path, and enable the tension of the cable to be transmitted to the steel main beam along the shortest path. By welding the stiffening ribs in sequence, an integral support and reinforcement system is formed, which enhances the integrity between the entire anchoring system and the steel main beam, and improves the adaptability and reliability of the structure under complex stress conditions.

[0061] Furthermore, the first supporting stiffening rib 41 is a whole plate, the bottom of which is welded to the upper end of the force transmission web 3, and the two sides are welded to the outer web 8 of the steel main beam and the steel anchor pipe 1; the second supporting stiffening rib 42 is two plates, which are welded to the two side walls of the force transmission web 3, and are welded to the outer web 8 of the steel main beam and the steel anchor pipe 1, and the intersection with the force transmission web 3 is located at the position of the cross diaphragm of the steel main beam, and the second supporting stiffening rib 42 is provided with a through-welding hole at the welding corner position with the outer web 8 of the steel main beam, the steel anchor pipe 1 and the force transmission web 3. The size of the through-welding hole for welding with the force transmission web 3 and the outer web 8 of the steel main beam is larger than that of the conventional through-welding hole, which facilitates the passage of rainwater, debris, etc., and improves the corrosion resistance toughness of the anchoring structure; the third supporting stiffening rib 43 is two plates, which are welded to The two side walls of the force transmission web 3 are welded to the outer web 8 of the steel main beam and the steel anchor pipe 1, wherein the two local stiffening ribs 6 of the anchor pipe facing inward are welded to the third supporting stiffening rib 43, and the third supporting stiffening rib 43 is welded to the corner points of the welding with the outer web 8 of the steel main beam, the steel anchor pipe 1 and the force transmission web 3. The size of the through-welding hole welded with the force transmission web 3 and the outer web 8 of the steel main beam is larger than that of the conventional through-welding hole, which is convenient for the passage of rainwater, debris, etc., and improves the corrosion resistance of the anchoring structure; the first, second and third supporting stiffening ribs are formed into a stable support system through multi-point welding, which enhances the connection strength between the steel anchor pipe and the steel main beam, ensures that the tension of the cable can be evenly transmitted to the steel main beam, and significantly improves the stability of the entire anchoring system. Secondly, the larger-sized through-weld holes set at the welding points of the second supporting stiffener and the third supporting stiffener with the force transfer web and the outer web of the steel main beam allow rainwater and debris to pass through smoothly, avoiding accumulation in the welding area, effectively reducing the risk of corrosion, and significantly improving the corrosion resistance of the anchoring structure.

[0062] Furthermore, the distance between the second supporting stiffening rib 42 and the third supporting stiffening rib 43 is 250 mm, so that the third supporting stiffening rib 43 is closer to the anchor plate 5, further reducing the local stress concentration of the steel anchor pipe 1 at the anchoring end, improving the fatigue toughness of the steel anchor pipe 1, and being able to effectively disperse the stress of the steel anchor pipe 1 at the anchoring end. At the same time, it can effectively reduce the fatigue damage risk of the steel anchor pipe 1 during long-term stress, significantly improve its fatigue toughness, and extend its service life.

[0063] Furthermore, the force transmission web 3 is fully welded to the outer web 8 of the steel main beam, the steel anchor pipe 1, the anchor plate 5, and the first supporting stiffener 41, forming a stable force transmission system that can effectively transfer loads and avoid stress concentration. The force transmission web 3 is not connected to the top plate and bottom plate of the steel main beam, avoiding direct force on the top plate and bottom plate, thereby reducing deformation and fatigue damage of the top plate and bottom plate due to local force, and ensuring the overall structural stability of the steel main beam. The corner points where the force transmission web 3 is welded to the anchor plate 5 and the third supporting stiffener 43 are provided with through-welding holes to facilitate welding operations and quality inspections, reduce welding defects and deformation, and improve construction efficiency and structural durability.

[0064] Furthermore, an arc is set at the welding position between the force-transmitting web 3, the anchor plate 5 and the outer web 8 of the steel main beam, and the end of the arc is welded along the plate thickness direction. After welding is completed, the weld is polished and smoothed along the arc curve, and ultrasonic hammering is performed. At the same time, the connection weld between the force-transmitting web 3 and the outer web 8 of the steel main beam is ultrasonically hammered within 500 mm on the side of the anchor end to reduce the local stress concentration of the force-transmitting web 3 and thereby improve its fatigue toughness. By setting an arc transition at the welding position and welding along the end of the arc, the stress concentration problem caused by the sharp corner is effectively eliminated, the stress distribution is made more uniform, and the risk of fatigue crack initiation is significantly reduced. At the same time, polishing the weld and ultrasonic hammering can improve the surface quality and residual stress state of the weld, further improve the fatigue resistance of the weld and the force-transmitting web, and extend the service life of the structure.

[0065] Furthermore, when the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the steel main beam outer web reinforcement assembly 7 includes a first steel main beam outer web stiffening rib 71 and a second steel main beam outer web stiffening rib 72. The first steel main beam outer web stiffening rib 71 is provided with two pieces, each located on the inner side of the steel main beam outer web 8 at the location of the first supporting stiffening rib 41, and a gap is reserved between the first steel main beam outer web stiffening rib and the top plate of the steel main beam without welding, thereby improving the local fatigue durability of the first steel main beam outer web stiffening rib 71. The second steel main beam outer web stiffening rib 72 is also provided with two pieces, each located on the inner side of the steel main beam outer web 8 at the location of the second supporting stiffening rib 42 and the third supporting stiffening rib 43, and welded to the bottom plate of the steel main beam, thereby enhancing the stability of the outer web. In particular, when the angle between the cable and the horizontal plane is large, the outer web stiffening rib can effectively resist vertical loads and lateral forces.

[0066] Furthermore, multiple local anchor pipe stiffening ribs 6 are welded to the anchor plate 5 and the steel anchor pipe 1 at equal intervals, and are perpendicular to the anchor plate 5 and the steel anchor pipe 1, which can effectively reduce the stress concentration at the end of the steel anchor pipe 1 and improve the structural toughness and fatigue resistance of the end of the steel anchor pipe 1.

[0067] Furthermore, when the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, the support reinforcement assembly 4 also includes a fourth support stiffening rib 44, and the fourth support stiffening rib 44 is two plates, which are welded to the two side walls of the force transmission web 3, and welded to the steel anchor pipe 1 and the outer web 8 of the steel main beam. The fourth support stiffening rib 44 is provided with through-welding holes at the welding corners with the outer web 8 of the steel main beam, the steel anchor pipe 1 and the force transmission web 3. The size of the through-welding holes provided for welding with the force transmission web 3 and the outer web 8 of the steel main beam is larger than the size of conventional through-welding holes, which facilitates the passage of rainwater, debris, etc., and improves the corrosion resistance and toughness of the anchoring structure.

[0068] Furthermore, when the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, the steel main beam outer web reinforcement assembly 7 includes a first steel main beam outer web stiffening rib 71. The first steel main beam outer web stiffening rib 71 is provided with two pieces, which are respectively located on the inner side of the steel main beam outer web 8 where the first supporting stiffening rib 41 is located, and a gap is reserved between the steel main beam top plate without welding, thereby improving the local fatigue durability of the first steel main beam outer web stiffening rib 71.

[0069] Example 2

[0070] Combine Figure 1-14 ,like Figure 15 As shown, the present invention provides a construction method for a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge, which is implemented by applying the high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge. The specific steps are as follows:

[0071] S100: Complete the manufacturing of the steel main beam segments and the cable-beam anchorage structure components in the factory;

[0072] S200: Weld the anchor plate 5 to the steel anchor pipe 1, weld the force transmission web 3 to the outer web 8 of the steel main beam, then weld the steel anchor pipe 1 to the force transmission web 3, and weld the cable guide 2 to the top of the steel anchor pipe 1;

[0073] S300: According to the design drawings, when the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, weld the first supporting stiffener 41, the second supporting stiffener 42, the third supporting stiffener 43, and the fourth supporting stiffener 44 to corresponding positions of the steel anchor pipe 1, the force transmission web 3, and the steel main beam outer web 8, and weld the first steel main beam outer web stiffener 71 to corresponding positions on the inner side of the steel main beam outer web 8;

[0074] S400: According to the design drawings, when the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the first supporting stiffener 41, the second supporting stiffener 42, and the third supporting stiffener 43 are welded to the corresponding positions of the steel anchor pipe 1, the force transmission web 3, and the steel main beam outer web 8, and the first steel main beam outer web stiffener 71 and the second steel main beam outer web stiffener 72 are welded to the corresponding positions on the inner side of the steel main beam outer web 8, and the second steel main beam outer web stiffener 72 is welded to the steel main beam bottom plate;

[0075] S500: Weld the anchor pipe local stiffening ribs 6 to the steel anchor pipe 1 and the anchor plate at equal intervals and vertically, and weld the two anchor pipe local stiffening ribs 6 facing inward to the third supporting stiffening rib 43.

[0076] The steel anchor pipe 1, cable guide tube 2, force transmission web 3, support reinforcement assembly 4, anchor pad 5, anchor pipe local stiffening rib 6, steel main beam outer web reinforcement assembly 7, and steel main beam outer web 8 of the present invention are all welded and formed in one step in the factory simultaneously with the steel main beam, which reduces on-site workload, shortens the construction period, and reduces construction difficulty and risk.

[0077] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge, characterized in that: It comprises a steel anchor pipe (1), a force transmission web (3), a support reinforcement assembly (4), a steel main beam outer web (8) and an anchor pad (5); wherein, An anchor plate (5) is welded to the bottom end of the steel anchor pipe (1), and the anchor plate (5) is located in the middle and lower part of the side of the steel main beam, which reduces the anchor point of the cable, reduces the tensile stress of the concrete bridge deck in the anchoring area, improves the overall toughness of the composite beam bridge deck system, and facilitates maintenance using an off-beam inspection vehicle without affecting traffic, thereby improving the convenience of maintenance; The outer side wall of the bottom end of the steel anchor pipe (1) is welded with a plurality of anchor pipe local stiffening ribs (6), and the plurality of anchor pipe local stiffening ribs (6) are welded to the anchor pad (5). The two side walls of the force transmission web (3) are respectively welded to the steel anchor pipe (1) and the outer web of the steel main beam (8). The support reinforcement assembly (4) is respectively welded to the steel anchor pipe (1), the force transmission web (3) and the outer web of the steel main beam (8). The inner side of the outer web of the steel main beam (8) is welded with a steel main beam outer web reinforcement assembly (7) to enhance the stability of the outer web of the steel main beam (8). The steel anchor tube (1) and the cable guide tube (2) are inclined along the transverse bridge direction, the outer web (8) of the steel main beam is an inclined web inclined toward the inner side of the steel main beam, and the side where the force transmission web (3) is welded to the steel anchor tube (1) is cut into an oblique edge along the inclined direction of the steel anchor tube (1) to adapt to the transverse inclination angle of the cable, reduce the transverse eccentricity of the cable anchor point relative to the steel main beam, and further reduce the additional bending moment, ultimately reducing the additional stress of the anchoring structure, improving the overall toughness of the anchoring structure, and enhancing its stability and reliability in a complex stress environment.

2. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to claim 1, characterized in that: When the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the support reinforcement assembly (4) includes a first support stiffening rib (41), a second support stiffening rib (42) and a third support stiffening rib (43), and the first support stiffening rib (41), the second support stiffening rib (42) and the third support stiffening rib (43) are welded to the steel anchor pipe (1), the force transmission web (3) and the steel main beam outer web (8) in sequence from top to bottom, and the first support stiffening rib (41), the second support stiffening rib (42) and the third support stiffening rib (43) are perpendicular to the force transmission web (3) and the steel main beam outer web (8); The first supporting stiffening rib (41) is a whole plate, the bottom of which is welded to the upper end of the force transmission web (3), and the two sides are welded to the outer web (8) of the steel main beam and the steel anchor pipe (1). The second supporting stiffening rib (42) is two plates, which are welded to the two side walls of the force transmission web (3), and are welded to the outer web (8) of the steel main beam and the steel anchor pipe (1). The intersection with the force transmission web (3) is located at the position of the steel main beam cross diaphragm. The second supporting stiffening rib (42) is welded to the outer web (8) of the steel main beam and the steel anchor pipe (1). Through-welding holes are provided at the welding corners of the main beam outer web (8), the steel anchor pipe (1) and the force transmission web (3); the third supporting stiffening rib (43) is two plates, which are welded to the two side walls of the force transmission web (3) and are welded to the steel main beam outer web (8), the anchor pipe local stiffening rib (6) and the steel anchor pipe (1); through-welding holes are provided at the welding corners of the third supporting stiffening rib (43) and the steel main beam outer web (8), the steel anchor pipe (1) and the force transmission web (3).

3. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to claim 1, characterized in that: When the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, the support reinforcement assembly (4) further includes a fourth support stiffening rib (44), which is two plates welded to the two side walls of the force transmission web (3) and welded to the steel anchor pipe (1) and the outer web of the steel main beam (8), and a through-welding hole is provided at the welding corner position of the fourth support stiffening rib (44) and the outer web of the steel main beam (8), the steel anchor pipe (1) and the force transmission web (3).

4. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to claim 1, characterized in that: When the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, the steel main beam outer web reinforcement assembly (7) includes a first steel main beam outer web stiffening rib (71), and the first steel main beam outer web stiffening rib (71) is provided with two pieces, which are respectively located on the inner side of the steel main beam outer web (8) at the position of the first supporting stiffening rib (41), and a gap is reserved between the steel main beam and the top plate without being welded.

5. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to claim 1, characterized in that: When the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the steel main beam outer web reinforcement assembly (7) further includes a second steel main beam outer web stiffening rib (72), and the second steel main beam outer web stiffening rib (72) is provided with two pieces, which are respectively located on the inner side of the steel main beam outer web (8) at the positions of the second supporting stiffening rib (42) and the third supporting stiffening rib (43), and are welded to the steel main beam bottom plate.

6. A high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to any one of claims 1 to 5, characterized in that: A cable guide tube (2) is welded to the top end of the steel anchor tube (1), and its inner diameter is the same as that of the steel anchor tube (1), and its outer diameter is smaller than that of the steel anchor tube (1), thereby preventing the steel anchor tube (1) from being arranged all the way from the bottom to the upper end of the cable guide tube (2).

7. The high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to claim 6, characterized in that: The end of the cable guide tube (2) is provided with a waterproof cover (9).

8. A high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to any one of claims 1 to 5, characterized in that: A circular hole is provided in the middle of the anchor plate (5), the size of the circular hole is determined according to the type of the cable, and the central axis of the anchor plate (5) coincides with the central axis of the steel anchor pipe (1).

9. A high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to any one of claims 1 to 5, characterized in that: The distance between the second supporting stiffening rib (42) and the third supporting stiffening rib (43) is 250 mm, so that the third supporting stiffening rib (43) is closer to the anchor plate (5), reducing the local stress concentration of the steel anchor pipe (1) at the anchoring end.

10. A construction method for a high-toughness cable-beam anchorage structure for a composite beam cable-stayed bridge, characterized in that: The method is implemented by applying a high-toughness cable-beam anchoring structure for a composite beam cable-stayed bridge according to any one of claims 1 to 9, comprising: S100: Complete the manufacturing of the steel main beam segments and the cable-beam anchorage structure components in the factory; S200: Welding the anchor plate (5) to the steel anchor pipe (1), welding the force transmission web (3) to the outer web (8) of the steel main beam, then welding the steel anchor pipe (1) to the force transmission web (3), and welding the cable guide (2) to the top of the steel anchor pipe (1); S300: According to the design drawings, when the angle θ between the cable and the horizontal plane satisfies 0°<θ≤45°, the first supporting stiffening rib (41), the second supporting stiffening rib (42), the third supporting stiffening rib (43) and the fourth supporting stiffening rib (44) are welded to the corresponding positions of the steel anchor pipe (1), the force transmission web (3) and the steel main beam outer web (8), and the first steel main beam outer web stiffening rib (71) is welded to the corresponding position on the inner side of the steel main beam outer web (8); S400: According to the design drawings, when the angle θ between the cable and the horizontal plane satisfies 45°<θ<90°, the first supporting stiffening rib (41), the second supporting stiffening rib (42) and the third supporting stiffening rib (43) are welded to the corresponding positions of the steel anchor pipe (1), the force transmission web (3) and the steel main beam outer web (8), and the first steel main beam outer web stiffening rib (71) and the second steel main beam outer web stiffening rib (72) are welded to the corresponding positions on the inner side of the steel main beam outer web (8), and the second steel main beam outer web stiffening rib (72) is welded to the steel main beam bottom plate; S500: Weld the anchor pipe local stiffening ribs (6) to the steel anchor pipe (1) and the anchor plate at equal intervals and vertically, and weld the two anchor pipe local stiffening ribs (6) facing inward to the third supporting stiffening rib (43).

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