Cable-girder-truss external anchoring structure of highway-railway dual-purpose cable-stayed bridge and construction method of cable-girder-truss external anchoring structure

Abstract

The invention relates to the field of bridge structure design, and discloses a cable-girder-truss external anchoring structure of a highway-railway dual-purpose cable-stayed bridge and a construction method, the cable-girder-truss external anchoring structure comprises a cantilever top plate which is flush with an upper chord top plate for fixing a steel truss and extends outwards, and the cantilever top plate is provided with an elliptical hole; the cable guide pipe allows the stay cable to penetrate through, and the center line of the cable guide pipe is eccentric to the main truss system line; the cable guide pipe penetrates through the elliptical hole; the cover plate is vertically fixed on the outer side of the upper chord member outer side gusset plate; the #-shaped structure is arranged between the cantilever top plate and the cover plate and is perpendicular to the cover plate and the upper chord outer side gusset plate at the same time, and the cable guide pipe is welded to the #-shaped structure in a penetrating mode; the cable girder outer anchoring structure further comprises a reinforcing structure, and the reinforcing structure comprises a vertical transverse partition plate and a horizontal partition plate. According to the cable beam outer-truss anchoring structure and the construction method, while outer-truss anchoring is met, the bridge deck width is reduced, the cost is reduced, the space below the outer-truss anchoring structure is large, and stay cable beam end tensioning and tower end anchoring can be achieved easily.

Description

Technical Field

[0001] The present invention relates to the field of bridge structure design, and in particular to a cable-girder-truss external anchoring structure and a construction method for a highway-railway dual-purpose cable-stayed bridge. Background Art

[0002] Currently, most dual-use cable-stayed bridges for highway and rail use steel trusses, characterized by double-deck bridge decks, high load capacity, high structural rigidity, and strong spanning capacity. The cable-beam anchorage system transmits the enormous cable forces of the stay cables to the main trusses, resulting in complex forces in the cable-beam anchorage area and the transmission pathways involved.

[0003] In related technologies, the cable-beam anchorage structure for dual-use highway-railway cable-stayed bridges primarily utilizes anchor plates or anchor boxes within the truss. The anchor plate type employs two vertical anchor plates spaced upward from the top surface of the upper chord node, corresponding to the upper chord web. The stay cable is directly anchored to the anchor box between the anchor plates. The anchorage structure, consisting primarily of anchor plates, anchor pads, bearing plates, and cable guide tubes, is relatively simple and widely used in large-span dual-use highway-railway steel truss cable-stayed bridges. The anchor box within the truss anchors the stay cable through the beam surface and anchors it inside the box-shaped upper chord. Two anchor plates are welded to the upper chord webs through full penetration welding, and the anchor tube extends through the chord top plate.

[0004] However, while the anchor plate type and the anchor box inside the truss can meet the structural stress requirements, they still have the following drawbacks: Regarding the anchor plate type, as the span and load of dual-purpose steel truss cable-stayed bridges for road and rail continue to increase, the cable force and cable length of the cable also increase accordingly. To ensure that the cable-beam anchoring structure can effectively transmit the cable force, the structural outline dimensions of the anchor plate need to be increased accordingly. The anchor plate structure occupies a larger bridge deck space, and the transverse width of the steel bridge deck needs to be further increased. Regarding the anchor box inside the truss, the cable guide tube passes through the top surface of the upper chord, and this part of the area is not accessible to vehicles. The truss width of the main truss needs to be further increased, thereby increasing the span of the bridge deck system.

[0005] In order to solve the problem of the anchor plates of the anchor plate type technical solution and the conduits of the anchor box technical solution occupying the bridge deck, technical personnel in this field may consider setting the anchor of the inclined cable outside the bridge deck. Based on the above ideas, Chinese patent CN107476181A was found. In this patent, the main beam includes an upper bridge deck and a lower bridge deck, wherein both sides of the lower bridge deck extend outward and form an extension, and the extension is a lower chord member, and the lower anchor end of the inclined cable is fixed inside the lower chord of the extension. The transverse dimension of the lower chord constituting the lower bridge deck is increased, so that the transverse dimension of the lower chord of the steel truss is larger than the transverse dimension of the upper chord of the steel truss, and the structural stress is more complicated. The transverse dimensions of the upper and lower chords of conventional steel trusses are basically the same, and the bottom end of the inclined cable is anchored inside the enlarged lower chord. However, the above patent still has the following problems: The lower chord needs to be extended outwards and is not in the same vertical plane as the upper chord, resulting in complex stress on the steel truss. The stay cables are anchored inside the enlarged box-shaped lower chord. The enclosed space inside the lower chord is small, making anchoring difficult. The enlarged lower chord structure uses a lot of materials, resulting in high material costs, and high installation and maintenance costs. The interior of the lower chord is a closed structure, and the beam end is the anchor end. The diagonal cables cannot be tensioned at the beam end, and can only be tensioned at the tower end. As a result, the size of the main tower increases due to the need to tension the diagonal cables, the main tower uses a high amount of concrete, and the construction cost of the main tower increases. Summary of the Invention

[0006] The present application provides a cable-beam-truss external anchoring structure and construction method for a highway-railway dual-purpose cable-stayed bridge, which meets the requirements of external truss anchoring while reducing the bridge deck width and lowering costs. In addition, the space below the external truss anchoring structure is large, which is conducive to achieving cable-stayed cable beam end tensioning and tower end anchoring, thereby reducing the size of the main tower.

[0007] In a first aspect, an embodiment of the present application provides a cable-beam-truss external anchoring structure for a highway-railway dual-purpose cable-stayed bridge, wherein the cable-beam-truss external anchoring structure is disposed on the transverse bridge-facing outer side of the upper chord of the steel truss, and the cable-beam-truss external anchoring structure comprises: A cantilever top plate is fixed flush with the upper chord top plate of the steel truss and extends outward, and an elliptical hole is provided on the cantilever top plate; A cable guide tube for passing the stay cable, wherein the center line of the cable guide tube is eccentric to the main truss system line; the cable guide tube passes through the elliptical hole; Cover plate, fixed vertically to the outside of the node plate outside the upper chord; The crisscross structure is arranged between the cantilever top plate and the cover plate, and is perpendicular to the cover plate and the node plate outside the upper chord. The cable guide tube is passed through and welded to the crisscross structure.

[0008] In combination with the first aspect, in one embodiment, the crisscross structure includes two main pressure-bearing plates and two auxiliary pressure-bearing plates, the two main pressure-bearing plates being closely attached to the cable guide tube and arranged at an angled interval up and down, and the two auxiliary pressure-bearing plates being closely attached to the cable guide tube and arranged at an angled interval inside and outside; the two main pressure-bearing plates are both perpendicular to the cover plate and the node plate outside the upper chord; the two auxiliary pressure-bearing plates are both vertically arranged between the two main pressure-bearing plates; The cable guide tube is welded to one or more of the two main pressure-bearing plates and the two auxiliary pressure-bearing plates.

[0009] In combination with the first aspect, in one embodiment, the cable-beam truss external anchoring structure further includes a reinforcement structure, and the reinforcement structure includes vertical transverse partitions, horizontal partitions and web horizontal ribs; the vertical transverse partitions, horizontal partitions and web horizontal ribs are vertically staggered in pairs at the anchoring area inside the upper chord corresponding to the cover plate and the criss-cross structure.

[0010] In combination with the first aspect, in one embodiment, the cable-beam-truss external anchoring structure further includes a top plate reinforcement plate and oblique stiffening ribs, and the top plate reinforcement plate is arranged close to the cantilever top plate; several of the oblique stiffening ribs are simultaneously perpendicular to the side wall of the cable guide tube located above the cantilever top plate, and the cantilever top plate and / or the top plate reinforcement plate.

[0011] In combination with the first aspect, in one embodiment, the cable-beam-truss external anchoring structure further includes a spherical anchor pad, the spherical anchor pad is located at the bottom of the cable guide tube, and two spherical anchor pads are both arranged on the lower surface of the cover plate.

[0012] In combination with the first aspect, in one embodiment, the cable-beam-truss external anchoring structure further includes a support seat, and the support seats are both perpendicular to the cantilever top plate and the outer node plate of the upper chord.

[0013] In a second aspect, an embodiment of the present application provides a construction method based on the above-mentioned cable-beam-truss external anchoring structure, comprising the following steps: The set transverse eccentricity distance outside the node plate girder outside the top chord determines the centerline of the cable guide; According to the transverse eccentric distance, a crisscross structure is arranged, the crisscross structure is vertically fixed to the outer node plate of the upper chord, and the top surface of the crisscross structure is flush and does not exceed the top plate of the upper chord; A cover plate is provided perpendicular to the bottom end surface of the crisscross structure and the outer node plate of the upper chord; A cantilever top plate extending outward and flush with the top plate of the upper chord is provided on the outer side of the upper chord truss, and the cantilever top plate is fixed to the top surface of the well-shaped structure; The cable guide tube passes through the elliptical hole of the cantilever arm top plate (11), is inserted into and welded to the well-shaped structure.

[0014] In conjunction with the second aspect, in one embodiment, the crisscross structure includes two main pressure-bearing plates and two auxiliary pressure-bearing plates; and the crisscross structure is arranged according to the transverse eccentric distance, including: The two main pressure-bearing plates are closely attached to the cable guide tube at an angled interval, and the two auxiliary pressure-bearing plates are closely attached to the cable guide tube at an angled interval. Both main pressure-bearing plates are perpendicular to the cover plate and the outer node plate of the upper chord. The two auxiliary pressure-bearing plates are both vertically arranged between the two main pressure-bearing plates.

[0015] In conjunction with the second aspect, in one embodiment, the cable-beam-truss external anchoring structure further includes a reinforcement structure, wherein the reinforcement structure includes a vertical transverse diaphragm, a horizontal diaphragm, and a web horizontal rib; Before setting the tic-tac-toe structure, the method includes: The vertical transverse diaphragms, horizontal diaphragms and web horizontal ribs are vertically staggered in pairs at the anchoring areas inside the upper chord corresponding to the cover plate and the crisscross structure.

[0016] In combination with the second aspect, in one embodiment, the cable-beam-truss external anchoring structure further includes a top plate reinforcement plate and oblique stiffening ribs. After the cable guide tube is passed through and welded to the crisscross structure, the method further comprises: The top plate reinforcement plate is closely set on the top plate of the cantilever arm; The plurality of oblique stiffening ribs are all perpendicular to the side wall of the cable guide tube located above the cantilever top plate, the cantilever top plate and / or the top plate reinforcement plate.

[0017] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least: The cable-beam-truss external anchoring structure and construction method of the present application can also effectively reduce the bridge deck space occupied by the cable anchoring area and reduce the main truss width and the bridge deck width, and there is no need to modify the lower chord, only the cable-beam-truss external anchoring structure needs to be additionally set on the outside of the upper chord, thereby reducing the project cost; the cable-beam-truss external anchoring structure can safely and reliably transmit the huge cable force of the cable to the main truss through the cantilever top plate, cover plate and criss-cross structure, while compared with the overall transverse expansion of the steel truss, the present application greatly reduces the material usage, and the lower chord and upper chord of the present application are also in the same vertical plane, which is simple for the steel truss to be stressed; more importantly, the cover plate below the cable-beam-truss external anchoring structure is in a non-closed state, with a large space and low anchoring difficulty, which greatly reduces the material cost, installation and maintenance cost, and is conducive to the tensioning of the cable beam end and the anchoring of the tower end. Compared with the tensioning of the tower end, the size of the main tower can be greatly reduced and the amount of concrete used in the main tower can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of the location of the cable-beam-truss external anchorage structure of the highway-railway dual-purpose cable-stayed bridge of this application; Figure 2 for Figure 1 A partial enlarged view of middle A; Figure 3 for Figure 2 Right view of; Figure 4 It is a three-dimensional schematic diagram of the cable-beam-truss external anchorage structure of the highway-railway dual-purpose cable-stayed bridge of this application.

[0020] In the figure: 1. Upper main pressure plate; 2. Lower main pressure plate; 3. Outer auxiliary pressure plate; 4. Inner auxiliary pressure plate; 5. Cover plate; 6. Spherical anchor plate; 7. Cable duct; 8. Top plate reinforcement plate; 9. Cable duct longitudinal stiffener; 10. Cable duct transverse stiffener; 11. Cantilever top plate; 12. Upper chord top plate; 13. Vertical transverse diaphragm; 14. Upper chord outer node plate; 15. Horizontal diaphragm; 17. Support seat; 100. Cable-beam truss external anchorage structure; 101. Main truss system line; 102. Cable duct centerline; 103. Actual anchor point of the inclined cable. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] The present application provides an external anchoring structure for a cable-beam-truss of a highway-railway dual-purpose cable-stayed bridge, which can effectively reduce the span of transverse load-bearing components such as crossbeams, reduce the width of the bridge deck, facilitate the tensioning of cable-stayed cables at the beam ends, improve the overall stress of the combined beam structure, facilitate construction, and reduce the construction stress of the main structure.

[0023] First of all, the dual-use cable-stayed bridge for road and rail is divided into a steel truss, an upper bridge deck and a lower bridge deck. The steel truss is composed of an upper chord, a lower chord and a web member. The upper bridge deck is composed of an upper bridge deck system, and the lower bridge deck is composed of a lower bridge deck system.

[0024] First, as Figures 1 to 4 As shown, the present embodiment provides an embodiment of a cable-beam-truss external anchorage structure for a dual-purpose cable-stayed bridge for railway and highway use. The cable-beam-truss external anchorage structure 100 is disposed on the transverse outboard side of the top chord. It is worth noting that the cable-beam-truss external anchorage structure 100 is disposed on the transverse outboard side of the existing top chord, rather than expanding the entire steel truss or bottom chord design dimensions.

[0025] Specifically, the cable-beam-truss external anchoring structure 100 includes a cantilever top plate 11 , a cable guide tube 7 , a cover plate 5 and a crisscross structure.

[0026] The cantilever top plate 11 is flush with and fixed to the upper chord top plate 12 of the steel truss, and the cantilever top plate 11 extends outward along the transverse bridge direction. The cantilever top plate 11 is provided with an elliptical hole.

[0027] The cable guide 7 is used for passing the stay cable, and the cable guide centerline 102 of the cable guide 7 is eccentric to the main stringer system line 101. The cable guide 7 passes through the elliptical hole at an angle.

[0028] The cover plate 5 is vertically fixed to the outer side of the upper chord outer node plate 14.

[0029] A crisscross structure is positioned between the boom top plate 11 and the cover plate 5, enclosing the cable guide 7. Its vertical cross-section forms a horizontal crisscross pattern. The crisscross structure is perpendicular to both the cover plate 5 and the top chord outer gusset plate 14. The cable guide 7 is threaded through the crisscross structure, with its bottom end welded to the cover plate 5. The cable guide 7 is then welded to the crisscross structure.

[0030] Specifically, all fixing methods in this application are welding fixation.

[0031] The cable-beam-truss external anchoring structure of the present application can also effectively reduce the bridge deck space occupied by the cable anchoring area of the inclined cable and reduce the main truss width and the bridge deck width, and there is no need to modify the lower chord. It is only necessary to set up an additional cable-beam-truss external anchoring structure on the outside of the upper chord, thereby reducing the project cost; the cable-beam-truss external anchoring structure can safely and reliably transmit the huge inclined cable force to the main truss (the main part of the steel truss) through the cantilever top plate 11, the cover plate 5 and the criss-cross structure. Compared with the overall transverse expansion of the steel truss, the present application greatly reduces the material usage, and the lower chord and the upper chord of the present application are also in the same vertical plane, which makes the steel truss simple to bear the force.

[0032] More importantly, the cover plate 5 of the cable-beam-truss external anchoring structure is in an open state, with a large space and low anchoring difficulty, which greatly reduces the material cost, installation and maintenance cost, and is conducive to the tensioning of the cable-stayed beam end and the anchoring of the tower end. Compared with the tensioning of the tower end, the size of the main tower can be greatly reduced and the amount of concrete used in the main tower can be reduced.

[0033] Furthermore, in one embodiment, the cross-shaped structure includes two main pressure-bearing plates and two auxiliary pressure-bearing plates. The two main pressure-bearing plates are arranged vertically and obliquely with intervals in close contact with the cable guide tube 7, while the two auxiliary pressure-bearing plates are arranged obliquely with intervals in close contact with the cable guide tube 7. Both main pressure-bearing plates are perpendicular to both the cover plate 5 and the outer gusset plate 14 of the top chord; the two auxiliary pressure-bearing plates are arranged vertically between the two main pressure-bearing plates.

[0034] The two main pressure-bearing plates and the two auxiliary pressure-bearing plates are enclosed to form a horizontal well-shaped structure. The cable guide 7 is welded to one or more of the two main pressure-bearing plates and the two auxiliary pressure-bearing plates.

[0035] Specifically, the crisscross structure includes an upper main pressure plate 1, a lower main pressure plate 2, an outer auxiliary pressure plate 3, and an inner auxiliary pressure plate 4. The upper main pressure plate 1 and the lower main pressure plate 2 are closely attached to the cable guide tube 7 and are arranged at an angled interval. The outer auxiliary pressure plate 3 and the inner auxiliary pressure plate 4 are closely attached to the cable guide tube 7 and are arranged at an angled interval. The upper main pressure plate 1 and the lower main pressure plate 2 are both perpendicular to the cover plate 5 and the outer node plate 14 of the upper chord. The outer auxiliary pressure plate 3 and the inner auxiliary pressure plate 4 are both vertically arranged between the two main pressure plates.

[0036] The cable-beam-truss external anchoring structure of the present application mainly bears the load through the upper main pressure plate 1 and the lower main pressure plate 2 of the well-shaped structure, and secondarily bears the load through the outer auxiliary pressure plate 3 and the inner auxiliary pressure plate 4 of the well-shaped structure. When there is a certain lateral eccentric distance between the center line of the cable guide tube and the main truss system line, resulting in a large additional bending moment, the stable bearing capacity of the well-shaped structure enables the huge cable force of the inclined cable to be safely and reliably transmitted to the main truss.

[0037] Furthermore, in one embodiment, the cable-beam-truss external anchoring structure 100 further includes a reinforcement structure comprising vertical transverse diaphragms 13 and horizontal diaphragms 15. The vertical transverse diaphragms 13 and horizontal diaphragms 15 are perpendicularly staggered and disposed inside the upper chord at the anchoring area corresponding to the cover plate 5 and the crisscross structure.

[0038] Specifically, since the cover plate 5 and the crisscross structure are fixed to the outer node plate 14 of the upper chord, the outer node plate 14 of the upper chord will be subjected to a large force. Therefore, an additional reinforcement structure is provided. The vertical transverse partitions 13 and the horizontal partitions 15 are vertically staggered with each other to locally strengthen the structural strength and meet the force requirements of the inclined cable.

[0039] Specifically, multiple vertical transverse partitions 13 are set at positions corresponding to the cable-beam anchoring structure inside the upper chord, and horizontal partitions 15 perpendicular to the vertical transverse partitions 13 are connected in the anchoring area. The vertical transverse partitions 13 and the horizontal partitions 15 form several small box chambers inside the upper chord, and arc transitions are set on the inner and outer sides of the horizontal partitions 15 to reduce stress concentration.

[0040] The cable-beam-truss external anchoring structure of the present application strengthens the structural strength of the inner side of the node plate 14 outside the upper chord, further enhancing the structural strength and allowing the huge cable force to be safely and reliably transmitted to the main truss.

[0041] like Figure 2 As shown, in one embodiment, the cable-beam-truss external anchoring structure 100 further includes a top plate reinforcement plate 8 and oblique stiffening ribs. The top plate reinforcement plate 8 is disposed closely against the top surface of the cantilever top plate 11. The plurality of oblique stiffening ribs are all perpendicular to the sidewall of the cable guide tube 7 located above the cantilever top plate 11, the cantilever top plate 11, and / or the top plate reinforcement plate 8.

[0042] Specifically, the oblique stiffening ribs include two cable duct longitudinal stiffening ribs 9 and two cable duct transverse stiffening ribs 10. The two cable duct longitudinal stiffening ribs 9 and the two cable duct transverse stiffening ribs 10 are arranged at 90° intervals in the circumference of the cable duct 7. The cable duct longitudinal stiffening ribs 9, the cable duct transverse stiffening ribs 10 are connected to the cable duct 7, the cantilever top plate 11, the top plate reinforcement plate 8 and other structures by welds.

[0043] The cable-beam-truss external anchoring structure of the present application strengthens the structural strength of the cable guide tube 7 located on the upper surface of the cantilever top plate 11 through the top plate reinforcement plate 8 and the oblique stiffening ribs, thereby improving the bearing capacity of the structure.

[0044] In one embodiment, the cable-beam-truss external anchoring structure 100 further includes spherical anchor pads 6 located at the bottom of the cable guide tube 7. Both spherical anchor pads 6 are closely attached to the lower surface of the cover plate 5. The spherical anchor pads 6 are located at the actual anchor points of the stay cables and serve to reinforce the cover plate 5 at the bottom of the cable guide tube 7, thereby enhancing the stability and load-bearing capacity of the entire structure.

[0045] Furthermore, the cable-beam-truss external anchoring structure 100 further includes support seats 17 , and a plurality of support seats 17 are perpendicular to the cantilever top plate 11 and the upper chord outer node plate 14 .

[0046] In a second aspect, the present application discloses a construction method based on the above-mentioned cable-beam-truss external anchoring structure, comprising the following steps: The set transverse eccentric distance of the upper chord outer gusset plate 14 outside the truss determines the cable guide centerline 102, and the installation position of the cable guide is determined in advance; According to the transverse eccentricity distance, a crisscross structure is set up. The crisscross structure is used to bear the force of the inclined cable. The crisscross structure is vertically fixed to the outer node plate 14 of the upper chord. The whole crisscross structure is inclined and parallel to the center line 102 of the cable guide tube, and the top surface of the crisscross structure is flush and horizontal, and does not exceed the top plate 12 of the upper chord.

[0047] A cover plate 5 is provided perpendicular to the bottom end face of the crisscross structure and the outer gusset plate 14 of the upper chord, and is used to support the entire structure. The cover plate 5 is welded and fixed to the outer gusset plate 14 of the upper chord and the bottom end face of the crisscross structure.

[0048] A cantilever top plate 11 is provided on the outer side of the upper chord truss, extending outward and flush with the upper chord top plate 12. The cantilever top plate 11 is fixed to the top end surface of the well-shaped structure. Specifically, the cantilever top plate 11 is welded to the outer end of the upper chord top plate 12, and the two are flush.

[0049] The cable guide tube 7 is passed through and welded to the cross-shaped structure.

[0050] The construction method of the cable-beam-truss external anchoring structure of this application has been verified by calculation and is capable of withstanding the enormous cable-stayed forces. The calculation and verification process is not detailed in this application. Prior to the emergence of this application, the anchoring method was usually adopted by expanding the steel truss or the bottom chord as a whole. This application does not require adjusting the size of the steel truss, but adopts a method of anchoring by simply extending the structure with a smaller size. This breaks with conventional thinking. Although the structure is simple, it can effectively transmit the huge cable force to the main truss and can also perform beam end tensioning.

[0051] The construction method of the cable-beam-truss external anchoring structure of the present application first determines the lateral eccentricity distance, then sets a crisscross structure for strong support, and then adopts a cover plate 5 for bottom support, sets a cantilever top plate 11 for upper support, so as to form a stable load-bearing structure that can bear the bending moment caused by eccentricity and transmit the cable force of the inclined cable to the main truss; the construction method of the cable-beam-truss external anchoring structure of the present application has a simple structure and efficient construction. The most critical thing is that the cover plate 5 of the cable-beam-truss external anchoring structure is non-enclosed below, with a large space and low anchoring difficulty, which greatly reduces the material cost, installation and maintenance cost, and is conducive to the realization of inclined cable beam end tensioning and tower end anchoring. Compared with tower end tensioning, the size of the main tower can be greatly reduced and the amount of concrete used in the main tower can be reduced.

[0052] Furthermore, in one embodiment, the crisscross structure includes two main pressure-bearing plates and two auxiliary pressure-bearing plates; and the crisscross structure is arranged according to the transverse eccentric distance, including: The two main pressure-bearing plates are closely attached to the cable guide tube 7 and are arranged at an angled interval. The two auxiliary pressure-bearing plates are closely attached to the cable guide tube 7 and are arranged at an angled interval. The two main pressure-bearing plates are both perpendicular to the cover plate 5 and the outer node plate 14 of the upper chord. The two auxiliary pressure plates are vertically arranged between the two main pressure plates.

[0053] The construction method of the cable-beam-truss external anchoring structure of the present application is mainly loaded by the upper main pressure-bearing plate 1 and the lower main pressure-bearing plate 2 of the well-shaped structure, and secondarily loaded by the outer auxiliary pressure-bearing plate 3 and the inner auxiliary pressure-bearing plate 4 of the well-shaped structure. When there is a certain lateral eccentric distance between the center line of the cable guide tube and the main truss system line, resulting in a large additional bending moment, the stable bearing capacity of the well-shaped structure enables the huge cable force of the inclined cable to be safely and reliably transmitted to the main truss.

[0054] Furthermore, in one embodiment, the cable-beam-truss external anchoring structure 100 further includes a reinforcement structure, and the reinforcement structure includes a vertical transverse diaphragm 13 and a horizontal diaphragm 15 .

[0055] Before setting up the tic-tac-toe structure, include: The vertical transverse partitions 13 and the horizontal partitions 15 are arranged perpendicularly and staggered to each other at the anchoring area inside the upper chord corresponding to the cover plate 5 and the well-shaped structure.

[0056] Furthermore, in one embodiment, the cable-beam-truss external anchoring structure 100 further comprises a top plate reinforcement plate 8 and oblique stiffening ribs; After the cable guide tube 7 is passed through and welded to the crisscross structure, it also includes: The top plate reinforcement plate 8 is closely arranged on the top plate 11 of the cantilever arm; The plurality of oblique stiffening ribs are all perpendicular to the side wall of the cable guide tube 7 located above the cantilever top plate 11 , the cantilever top plate 11 and / or the top plate reinforcement plate 8 .

[0057] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0058] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0059] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A cable-beam-truss external anchorage structure for a highway-railway dual-purpose cable-stayed bridge, characterized in that: The cable-beam-truss external anchoring structure (100) is arranged on the transverse bridge outer side of the upper chord of the steel truss, and the cable-beam-truss external anchoring structure (100) comprises: A cantilever top plate (11) is fixed flush with the upper chord top plate (12) of the steel truss and extends outward, and an elliptical hole is provided on the cantilever top plate (11); A cable guide tube (7) for passing a stay cable, wherein a cable guide tube centerline (102) is eccentric to a main girder system line (101); the cable guide tube (7) passes through the elliptical hole; A cover plate (5) is fixed vertically to the outside of the node plate (14) outside the upper chord; A crisscross structure is provided between the boom top plate (11) and the cover plate (5), and is perpendicular to both the cover plate (5) and the upper chord outer node plate (14). The cable guide tube (7) is passed through and welded to the crisscross structure.

2. The cable-beam-truss external anchorage structure of a highway-railway dual-purpose cable-stayed bridge according to claim 1, characterized in that: The well-shaped structure comprises two main pressure-bearing plates and two auxiliary pressure-bearing plates, the two main pressure-bearing plates being closely attached to the cable guide tube (7) and arranged at intervals with an inclination up and down, and the two auxiliary pressure-bearing plates being closely attached to the cable guide tube (7) and arranged at intervals with an inclination inside and outside; the two main pressure-bearing plates are both perpendicular to the cover plate (5) and the node plate (14) outside the upper chord; and the two auxiliary pressure-bearing plates are both vertically arranged between the two main pressure-bearing plates; The cable guide tube (7) is welded to one or more of the two main pressure-bearing plates and the two auxiliary pressure-bearing plates.

3. The cable-beam-truss external anchorage structure of a highway-railway dual-purpose cable-stayed bridge according to claim 1, characterized in that: The cable-beam-truss external anchoring structure (100) further comprises a reinforcement structure, wherein the reinforcement structure comprises a vertical transverse partition (13) and a horizontal partition (15); the vertical transverse partition (13) and the horizontal partition (15) are mutually vertically staggered and arranged in an anchoring area corresponding to the cover plate (5) and the crisscross structure inside the upper chord.

4. The cable-beam-truss external anchorage structure of a highway-railway dual-purpose cable-stayed bridge according to claim 1, characterized in that: The cable-beam truss external anchoring structure (100) further comprises a top plate reinforcement plate (8) and oblique stiffening ribs, wherein the top plate reinforcement plate (8) is arranged close to the cantilever arm top plate (11); and a plurality of the oblique stiffening ribs are simultaneously perpendicular to the side wall of the cable guide tube (7) located above the cantilever arm top plate (11), the cantilever arm top plate (11) and / or the top plate reinforcement plate (8).

5. The cable-beam-truss external anchorage structure of a highway-railway dual-purpose cable-stayed bridge according to claim 1, characterized in that: The cable-beam-truss external anchoring structure (100) further comprises a spherical anchor pad (6), the spherical anchor pad (6) being located at the bottom of the cable guide tube (7), and the two spherical anchor pads (6) being both arranged on the lower surface of the cover plate (5).

6. The cable-beam-truss external anchorage structure of a highway-railway dual-purpose cable-stayed bridge according to claim 1, characterized in that: The cable-beam-truss external anchoring structure (100) further comprises a support seat (17), and the support seat (17) is perpendicular to both the cantilever top plate (11) and the upper chord outer node plate (14).

7. A construction method for the cable-beam-truss external anchoring structure according to claim 1, characterized in that: The following steps are involved: The set transverse eccentric distance of the outer side of the upper chord outer node plate (14) determines the center line of the cable guide (102); According to the transverse eccentric distance, a tic-tac-toe structure is provided, the tic-tac-toe structure is vertically fixed to the outer node plate (14) of the upper chord, and the top surface of the tic-tac-toe structure is flush and does not exceed the upper chord top plate (12); A cover plate (5) is provided perpendicular to the bottom end surface of the crisscross structure and the outer node plate (14) of the upper chord; A cantilever top plate (11) extending outward and flush with the upper chord top plate (12) is provided on the outer side of the upper chord truss, and the cantilever top plate (11) is fixed to the top end surface of the well-shaped structure; The cable guide tube (7) passes through the elliptical hole of the cantilever arm top plate (11), is inserted into and welded to the well-shaped structure.

8. The construction method according to claim 6, wherein: The crisscross structure includes two main pressure-bearing plates and two auxiliary pressure-bearing plates; the crisscross structure is arranged according to the transverse eccentric distance, including: The two main pressure bearing plates are closely attached to the cable guide tube (7) and arranged at an angled interval up and down, and the two auxiliary pressure bearing plates are closely attached to the cable guide tube (7) and arranged at an angled interval inside and outside; the two main pressure bearing plates are both perpendicular to the cover plate (5) and the upper chord outer node plate (14); The two auxiliary pressure-bearing plates are both vertically arranged between the two main pressure-bearing plates.

9. The construction method according to claim 6, wherein: The cable-beam-truss external anchoring structure (100) further comprises a reinforcement structure, wherein the reinforcement structure comprises a vertical transverse diaphragm (13) and a horizontal diaphragm (15); Before setting the tic-tac-toe structure, the method includes: The vertical transverse partitions (13) and the horizontal partitions (15) are arranged perpendicularly and staggered to each other at the anchoring area inside the upper chord corresponding to the cover plate (5) and the well-shaped structure.

10. The construction method according to claim 6, wherein: The cable-beam-truss external anchoring structure (100) further comprises a top plate reinforcement plate (8) and oblique stiffening ribs; After the cable guide tube (7) is passed through and welded to the crisscross structure, it also includes: The top plate reinforcement plate (8) is closely arranged on the top plate (11) of the boom; The plurality of oblique stiffening ribs are all perpendicular to the side wall of the cable guide tube (7) located above the cantilever top plate (11), the cantilever top plate (11) and / or the top plate reinforcement plate (8).

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