Cable-stayed bridge's cable-beam truss outer anchoring structure and construction method

Abstract

The application relates to the field of bridge structure design, and discloses a cable-beam truss external anchoring structure and a construction method of a combined highway and railway cable-stayed bridge. The cable-beam truss external anchoring structure comprises a cantilever top plate which is fixed to the top plate of the upper chord of a steel truss and extends outward, and the cantilever top plate is provided with an elliptical hole; a cable guide pipe through which a stay cable passes, the center line of the cable guide pipe is eccentric to the main truss system line; the cable guide pipe passes through the elliptical hole; a cover plate which is fixed vertically to the outside of the upper chord outside node plate; a cross-shaped structure which is arranged between the cantilever top plate and the cover plate and is perpendicular to the cover plate and the upper chord outside node plate at the same time, and the cable guide pipe is welded to the cross-shaped structure; and the cable-beam truss external anchoring structure further comprises a reinforcing structure which comprises vertical transverse partitions and horizontal partitions. The cable-beam truss external anchoring structure and the construction method of the application meet the requirement of truss external anchoring, reduce the width of the bridge deck, reduce the cost, and the space below the truss external anchoring structure is large, which is beneficial to realize the tensioning of the cable-stayed cable beam end and the anchoring of the tower end.

Description

Technical Field

[0001] This invention relates to the field of bridge structural design, specifically to an external anchorage structure and construction method for a cable-stayed bridge for both road and rail use. Background Technology

[0002] Currently, most cable-stayed bridges for both road and rail use adopt steel truss structures, characterized by double-deck bridges, large loads, high structural rigidity, and strong spanning capacity. The cable-beam anchorage structure transfers the enormous cable force from the stay cables to the main truss, and the stress conditions and force transmission paths in the cable-beam anchorage zone are relatively complex.

[0003] In related technologies, the cable-stayed bridges for both road and rail use mainly employ anchor plate type or internal anchor box type. The anchor plate type involves two vertically spaced anchor plates installed at intervals on the top surface of the upper chord node, corresponding to the web of the upper chord, directly anchoring the stay cables to the anchor box between the anchor plates. The anchoring structure mainly consists of anchor plates, anchor pads, bearing plates, and cable guides, and is relatively simple in construction, widely used in large-span steel truss cable-stayed bridges for both road and rail use. The internal anchor box type anchors the stay cables through the beam surface and anchors them inside the box-shaped upper chord. It uses two anchor plates welded to both webs of the upper chord, with the anchor pipe extending out from the top plate of the chord.

[0004] However, while anchored plate and internal anchor boxes can meet the structural stress requirements, they still have the following drawbacks: Regarding anchored plate types, as the span and load of dual-purpose (rail and road) steel truss cable-stayed bridges continue to increase, the cable force and cable length also increase accordingly. To ensure that the cable-stayed girder anchorage structure can effectively transfer the cable force, the structural outline dimensions of the anchor plate need to be increased accordingly. The anchor plate structure occupies a large amount of bridge deck space, and the transverse width of the steel bridge deck needs to be increased additionally. Regarding internal anchor boxes, the cable guide tubes extend from the top surface of the upper chord, and this area is not suitable for vehicular traffic. The width of the main truss needs to be increased additionally, thereby increasing the span of the bridge deck system.

[0005] To address the issue of ductwork occupying the bridge deck in anchored plate technology and internal anchor box technology, could those skilled in the art consider anchoring the stay cables outside the bridge deck? Based on this idea, Chinese patent CN107476181A was found. In this patent, the main beam includes an upper bridge deck and a lower bridge deck. Both sides of the lower bridge deck extend outwards to form protrusions, which are lower chord members. The lower anchoring end of the stay cable is fixed inside the lower chord member of the protrusion. The increased lateral dimension of the lower chord member constituting the lower bridge deck makes the lateral dimension of the lower chord member of the steel truss larger than that of the upper chord member, resulting in a more complex structural stress. In conventional steel trusses, the lateral dimensions of the upper and lower chord members are basically the same, and the bottom end of the stay cable is anchored inside the enlarged lower chord member. However, the above patent still has the following problems: The lower chord needs to extend outwards and is not in the same vertical plane as the upper chord, making the stress on the steel truss complex. 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 requires a large amount of material, resulting in high material costs, as well as high installation and maintenance costs. The lower chord has a closed structure inside, and the beam end is the anchoring end. The stay cables cannot be tensioned at the beam end, but can only be tensioned at the tower end. This results in the main tower's size increasing due to the need to tension the stay cables, and the main tower requires a higher amount of concrete, thus increasing the main tower's construction cost. Summary of the Invention

[0006] This application provides an external anchorage structure and construction method for a cable-stayed bridge for both road and rail use. While satisfying the external anchorage requirement, it reduces the bridge deck width and lowers costs. Furthermore, the external anchorage structure provides ample space below, which facilitates tensioning at the cable-stayed beam ends and anchoring at the tower ends, thereby reducing the size of the main tower.

[0007] In a first aspect, embodiments of this application provide an external anchorage structure for a cable-stayed bridge used for both road and rail. The external anchorage structure is located transversely to the outer side of the upper chord of the steel truss and comprises: The cantilever top plate is flush with and fixed to the top plate of the upper chord of the steel truss and extends outward, and the cantilever top plate is provided with elliptical holes; A cable guide tube for the passage of the stay cables, the centerline of which is eccentric to the main truss system line; the cable guide tube passes through the elliptical hole; The cover plate is vertically fixed to the outside of the node plate on the outer side of the upper chord. The grid-shaped structure is located between the top plate of the cantilever arm and the cover plate, and is perpendicular to both the cover plate and the outer node plate of the upper chord. The cable guide is inserted through and welded to the grid-shaped structure.

[0008] In conjunction with the first aspect, in one embodiment, the grid-shaped structure includes two main bearing plates and two secondary bearing plates. The two main bearing plates are arranged at an angle, closely attached to the cable guide tube, and the two secondary bearing plates are arranged at an angle, closely attached to the inside and outside of the cable guide tube. Both main bearing plates are perpendicular to both the cover plate and the outer node plate of the upper chord. The two secondary bearing plates are vertically arranged between the two main bearing plates. The cable guide is welded to one or more of the two main bearing plates and two secondary bearing plates.

[0009] In conjunction with the first aspect, in one embodiment, the cable-stayed girder external anchorage structure further includes a reinforcing structure, which includes vertical diaphragms, horizontal diaphragms, and web horizontal ribs; the vertical diaphragms, horizontal diaphragms, and web horizontal ribs are arranged vertically and alternately in pairs at the anchorage areas inside the upper chord corresponding to the cover plate and the grid-shaped structure.

[0010] In conjunction with the first aspect, in one embodiment, the cable girder external anchorage structure further includes a top plate reinforcing plate and diagonal stiffening ribs, wherein the top plate reinforcing plate is disposed close to the top plate of the cantilever arm; and several of the diagonal stiffening ribs are simultaneously perpendicular to the side wall of the cable guide located above the top plate of the cantilever arm, and the top plate of the cantilever arm and / or the top plate reinforcing plate.

[0011] In conjunction with the first aspect, in one embodiment, the cable-stayed girder external anchoring structure further includes spherical anchor plates located at the bottom opening of the cable guide tube, and both spherical anchor plates are disposed on the lower surface of the cover plate.

[0012] In conjunction with the first aspect, in one embodiment, the cable girder external anchorage structure further includes support seats, all of which are perpendicular to both the top plate of the cantilever arm and the outer node plate of the upper chord.

[0013] Secondly, this application provides a construction method based on the above-mentioned cable-stayed girder external anchorage structure, comprising the following steps: The centerline of the cable guide is determined by setting the lateral eccentricity distance on the outer side of the outer node plate girder of the upper chord. Based on the aforementioned lateral eccentricity distance, a grid-shaped structure is set up. The grid-shaped structure is vertically fixed to the outer node plate of the upper chord, and the top surface of the grid-shaped structure is flush with the top plate of the upper chord. A cover plate is installed perpendicular to the bottom end face of the grid structure and the outer node plate of the upper chord. A cantilever top plate is provided on the outside of the upper chord truss, extending outward and flush with the top plate of the upper chord, and the cantilever top plate is fixed to the top surface of the grid structure; The cable guide tube passes through the elliptical hole in the top plate (11) of the cantilever arm, is inserted into and welded to the grid structure.

[0014] In conjunction with the second aspect, in one embodiment, the grid-shaped structure includes two main bearing plates and two secondary bearing plates; the step of setting the grid-shaped structure according to the lateral eccentricity distance includes: Two main bearing plates are set at an angle, closely attached to the cable guide tube, and two auxiliary bearing plates are set at an angle, closely attached to the inside and outside of the cable guide tube; both main bearing plates are perpendicular to the cover plate and the outer node plate of the upper chord. Both auxiliary pressure plates are vertically arranged between the two main pressure plates.

[0015] In conjunction with the second aspect, in one embodiment, the cable-stayed girder external anchorage structure further includes a reinforcing structure, which includes vertical diaphragms, horizontal diaphragms, and web horizontal ribs. Before setting the grid structure, the following is included: Vertical diaphragms, horizontal diaphragms, and horizontal web ribs are arranged in pairs, perpendicularly and alternately, inside the upper chord and at the anchorage areas corresponding to the cover plate and the grid structure.

[0016] In conjunction with the second aspect, in one embodiment, the cable-stayed girder external anchorage structure further includes a top plate reinforcing plate and diagonal stiffening ribs. After the cable conduit is inserted into and welded to the grid structure, it also includes: The top plate reinforcement plate is installed tightly against the top plate of the cantilever arm; Several of the aforementioned diagonal stiffening ribs are simultaneously perpendicular to the side wall of the cable guide above the cantilever top plate, and to the cantilever top plate and / or the top plate reinforcement plate.

[0017] The beneficial effects of the technical solutions provided in this application include at least the following: The cable-stayed girder external anchorage structure and construction method of this application can also effectively reduce the bridge deck space occupied by the cable anchorage area and reduce the width of the main truss and the bridge deck. Moreover, it does not require modification of the lower chord, but only requires an additional cable-stayed girder external anchorage structure on the outside of the upper chord, thus reducing the project cost. The cable-stayed girder external anchorage 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 grid structure. At the same time, compared with the overall lateral expansion of the steel truss, this application greatly reduces the amount of material used. In addition, the lower chord and upper chord of this application are in the same vertical plane, which simplifies the stress on the steel truss. More importantly, the area below the cover plate of the cable-stayed girder external anchorage structure is not closed, with a large space and low anchorage difficulty, which greatly reduces the material cost, installation and maintenance cost. It is conducive to realizing cable-stayed girder end tensioning and tower end anchorage. Compared with tower end tensioning, the main tower size can be greatly reduced and the amount of concrete used in the main tower can be reduced. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram showing the location of the external anchorage structure of the cable-stayed bridge for both road and rail use in this application; Figure 2 for Figure 1 A magnified view of part A in the image; Figure 3 for Figure 2 The right view; Figure 4 This is a three-dimensional schematic diagram of the external anchorage structure of the cable-stayed bridge for both road and rail use as described in this application.

[0020] In the diagram: 1. Upper main bearing plate; 2. Lower main bearing plate; 3. Outer secondary bearing plate; 4. Inner secondary bearing plate; 5. Cover plate; 6. Spherical anchor plate; 7. Cable guide; 8. Top plate reinforcing plate; 9. Longitudinal stiffening rib of cable guide; 10. Transverse stiffening rib of cable guide; 11. Cantilever top plate; 12. Top plate of upper chord; 13. Vertical diaphragm; 14. Outer node plate of upper chord; 15. Horizontal diaphragm; 17. Support seat; 100. External anchorage structure of cable beam truss; 101. Main truss system line; 102. Center line of cable guide; 103. Actual anchor point of stay cable. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] This application provides an external anchorage structure for the cable-stayed bridge for both road and rail use, which can effectively reduce the span of transverse load-bearing components such as crossbeams, reduce the bridge deck width, facilitate the tensioning of cable stays 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, a cable-stayed bridge for both road and rail use consists of a steel truss, an upper deck, and a lower deck. The steel truss is composed of an upper chord, a lower chord, and web members. The upper deck is composed of an upper deck system, and the lower deck is composed of a lower deck system.

[0024] Firstly, such as Figures 1 to 4 As shown in the figure, this application provides an embodiment of the cable-stayed bridge for both road and rail use with an external anchorage structure 100. The external anchorage structure 100 is located on the outer side of the upper chord. It is worth noting that instead of enlarging the entire steel truss or lower chord design dimensions, the external anchorage structure 100 is set on the outer side of the existing upper chord.

[0025] Specifically, the cable girder external anchorage structure 100 includes a cantilever top plate 11, cable guide 7, cover plate 5, and a grid-shaped structure.

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

[0027] The cable guide 7 is used for the cable stays to pass through, and the centerline 102 of the cable guide 7 is eccentric to the main truss 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 outside of the node plate 14 on the outer side of the upper chord.

[0029] A grid-shaped structure is set between the cantilever top plate 11 and the cover plate 5, surrounding the cable guide 7. The vertical cross-section of the grid-shaped structure is a horizontal grid shape. The grid-shaped structure is perpendicular to both the cover plate 5 and the outer node plate 14 of the upper chord. The cable guide 7 passes through the grid-shaped structure, and its bottom end is welded and fixed to the cover plate 5. The cable guide 7 is welded to the grid-shaped structure.

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

[0031] The cable-stayed girder external anchorage structure of this application can also effectively reduce the bridge deck space occupied by the cable anchorage area and reduce the width of the main truss and the bridge deck. Moreover, it does not require modification of the lower chord, but only requires an additional cable-stayed girder external anchorage structure on the outside of the upper chord, thus reducing the project cost. The cable-stayed girder external anchorage structure can safely and reliably transmit the huge cable force of the cable stay to the main truss (the main body of the steel truss) through the cantilever top plate 11, cover plate 5 and grid structure. At the same time, compared with the overall lateral expansion of the steel truss, this application greatly reduces the amount of material used. In addition, the lower chord and upper chord of this application are in the same vertical plane, which simplifies the stress on the steel truss.

[0032] More importantly, the area below the cover plate 5 of the cable girder external anchorage structure is not enclosed, with a large space and low anchorage difficulty, which greatly reduces material costs, installation and maintenance costs. It is also conducive to achieving tensioning at the cable girder end and anchoring at the tower end. Compared with tower end tensioning, the main tower size can be greatly reduced and the amount of concrete used in the main tower can be reduced.

[0033] Furthermore, in one embodiment, the grid-shaped structure includes two main bearing plates and two secondary bearing plates. The two main bearing plates are inclined and spaced apart vertically against the cable guide 7, and the two secondary bearing plates are inclined and spaced apart horizontally against the cable guide 7. Both main bearing plates are perpendicular to both the cover plate 5 and the outer node plate 14 of the upper chord; both secondary bearing plates are vertically positioned between the two main bearing plates.

[0034] Two main bearing plates and two secondary bearing plates enclose a horizontally lying grid-like structure. The cable guide 7 is welded to one or more of the two main bearing plates and two secondary bearing plates.

[0035] Specifically, the grid-shaped structure includes an upper main bearing plate 1, a lower main bearing plate 2, an outer secondary bearing plate 3, and an inner secondary bearing plate 4. The upper main bearing plate 1 and the lower main bearing plate 2 are arranged at an angle, closely attached to the cable guide 7, while the outer secondary bearing plate 3 and the inner secondary bearing plate 4 are arranged at an angle, closely attached to the cable guide 7, and inwardly and outwardly. The upper main bearing plate 1 and the lower main bearing plate 2 are both perpendicular to the cover plate 5 and the outer node plate 14 of the upper chord. The outer secondary bearing plate 3 and the inner secondary bearing plate 4 are both vertically arranged between the two main bearing plates.

[0036] The cable-stayed girder external anchorage structure of this application mainly bears the load through the upper main bearing plate 1 and the lower main bearing plate 2 of the grid structure, and secondarily through the outer secondary bearing plate 3 and the inner secondary bearing plate 4 of the grid structure. When there is a certain lateral eccentricity between the center line of the cable guide and the main girder system line, resulting in a large additional bending moment, the stable bearing capacity of the grid structure enables the huge cable force of the stay cable to be safely and reliably transmitted to the main girder.

[0037] Furthermore, in one embodiment, the cable girder external anchorage structure 100 also includes a reinforcing structure, which includes a vertical diaphragm 13 and a horizontal diaphragm 15. The vertical diaphragm 13 and the horizontal diaphragm 15 are arranged perpendicularly and alternately inside the upper chord at the anchorage area corresponding to the cover plate 5 and the grid-shaped structure.

[0038] Specifically, since the cover plate 5, the grid structure and the outer node plate 14 of the upper chord are fixed, the outer node plate 14 of the upper chord will bear a large force. Therefore, an additional reinforcing structure is set up. The vertical diaphragm 13 and the horizontal diaphragm 15 are perpendicular to each other to locally strengthen the structural strength and meet the stress requirements of the cable.

[0039] Specifically, multiple vertical diaphragms 13 are installed inside the upper chord at positions corresponding to the cable beam anchorage structure, and horizontal diaphragms 15 perpendicular to the vertical diaphragms 13 are connected within the anchorage area. The vertical diaphragms 13 and horizontal diaphragms 15 form several small chambers inside the upper chord, and the horizontal diaphragms 15 have rounded transitions on their inner and outer sides to reduce stress concentration.

[0040] The cable-stayed girder external anchorage structure of this application strengthens the structural strength of the inner side of the outer node plate 14 of the upper chord in the local area, further enhancing the structural strength and ensuring that the huge cable force of the cable is safely and reliably transmitted to the main truss.

[0041] like Figure 2 As shown, in one embodiment, the cable girder external anchorage structure 100 further includes a top plate reinforcing plate 8 and diagonal stiffening ribs, with the top plate reinforcing plate 8 disposed close to the top surface of the cantilever top plate 11. Several diagonal stiffening ribs are simultaneously perpendicular to the side wall of the cable guide 7 located above the cantilever top plate 11, and to the cantilever top plate 11 and / or the top plate reinforcing plate 8.

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

[0043] The cable-stayed girder external anchorage structure of this application strengthens the structural strength of the cable guide 7 located on the upper surface of the cantilever top plate 11 by means of the top plate reinforcing plate 8 and the diagonal stiffening ribs, thereby improving the load-bearing capacity of the structure.

[0044] In one embodiment, the cable-stayed girder external anchorage structure 100 further includes spherical anchor plates 6. The spherical anchor plates 6 are located at the bottom opening of the cable guide 7, and both spherical anchor plates 6 are tightly attached to the lower surface of the cover plate 5. The location of the spherical anchor plates 6 corresponds to the actual anchor point of the stay cable. The spherical anchor plates 6 are used to strengthen the cover plate 5 at the bottom opening of the cable guide 7, enhancing the stability and load-bearing capacity of the entire structure.

[0045] Furthermore, the cable girder external anchorage structure 100 also includes support seats 17, and several support seats 17 are simultaneously perpendicular to the cantilever top plate 11 and the outer node plate 14 of the upper chord.

[0046] Secondly, this application discloses a construction method based on the above-mentioned cable-stayed girder external anchorage structure, comprising the following steps: The set lateral eccentricity distance on the outer side of the upper chord node plate 14 determines the center line 102 of the cable guide, thus determining the installation position of the cable guide in advance. Based on the lateral eccentricity, a grid-shaped structure is set up to bear the force of the stay cable. The grid-shaped structure is vertically fixed to the outer node plate 14 of the upper chord. The grid-shaped structure is inclined as a whole and parallel to the center line 102 of the cable guide tube. The top surface of the grid-shaped structure is flush and horizontal and does not exceed the top plate 12 of the upper chord.

[0047] A cover plate 5 is installed perpendicular to the bottom surface of the grid-shaped structure and the outer node plate 14 of the upper chord. The cover plate 5 is used to support the entire structure. The cover plate 5 is welded and fixed to the outer node plate 14 of the upper chord and the bottom surface of the grid-shaped structure.

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

[0049] The cable guide 7 is inserted and welded to the grid-shaped structure.

[0050] The construction method of the cable-stayed girder external anchorage structure in this application has been calculated and verified to withstand the enormous cable forces. The calculation and verification process will not be elaborated in this application. Prior to this application, the common method of anchoring was to expand the steel truss or lower chord as a whole laterally. This application does not require adjustment of the steel truss size, but uses a method of anchoring with only a small additional extension of the structure, breaking with conventional thinking. Although the structure is simple, it can effectively transfer the huge cable forces to the main truss and also allows for beam end tensioning.

[0051] The construction method of the cable-stayed girder external anchorage structure of this application first determines the lateral eccentricity distance, then sets up a grid-shaped structure for strong support, then uses a cover plate 5 for bottom support, and sets a cantilever top plate 11 for upper support to form a stable load-bearing structure that can bear the bending moment caused by eccentricity and transfer the cable force of the cable stays to the main truss. The construction method of the cable-stayed girder external anchorage structure of this application has a simple structure and high construction efficiency. Most importantly, the cover plate 5 of the cable-stayed girder external anchorage structure is not closed, with a large space and low anchorage difficulty, which greatly reduces material costs, installation and maintenance costs. It is conducive to achieving tensioning at the cable stay beam end and anchoring at the tower end. Compared with tower end tensioning, it can greatly reduce the size of the main tower and reduce the amount of concrete used in the main tower.

[0052] Furthermore, in one embodiment, the grid-shaped structure includes two main bearing plates and two secondary bearing plates; the step of setting the grid-shaped structure according to the lateral eccentricity distance includes: Two main bearing plates are set at an angle, closely attached to the cable guide 7, and two auxiliary bearing plates are set at an angle, closely attached to the inside and outside of the cable guide 7; both main bearing plates are perpendicular to the cover plate 5 and the outer node plate 14 of the upper chord. Both secondary bearing plates are vertically positioned between the two main bearing plates.

[0053] The construction method of the cable-stayed girder external anchorage structure of this application mainly relies on the upper main bearing plate 1 and lower main bearing plate 2 of the grid structure for bearing, and secondarily relies on the outer secondary bearing plate 3 and inner secondary bearing plate 4 of the grid structure for bearing. When there is a certain lateral eccentricity between the center line of the cable guide and the main girder system line, resulting in a large additional bending moment, the stable bearing capacity of the grid structure enables the huge cable force of the cable stay to be safely and reliably transmitted to the main girder.

[0054] Furthermore, in one embodiment, the cable girder external anchorage structure 100 also includes a reinforcing structure, which includes a vertical diaphragm 13 and a horizontal diaphragm 15.

[0055] Before setting the grid structure, the following should be included: Vertical diaphragms 13 and horizontal diaphragms 15 are arranged perpendicularly and alternately inside the upper chord, corresponding to the anchorage area of ​​the cover plate 5 and the grid structure.

[0056] Furthermore, in one embodiment, the cable girder external anchorage structure 100 also includes a top plate reinforcing plate 8 and diagonal stiffening ribs. After the cable conduit 7 is inserted into and welded to the grid structure, it also includes: The top plate reinforcement plate 8 is installed closely to the cantilever top plate 11; Several of the aforementioned diagonal stiffening ribs are simultaneously perpendicular to the side wall of the cable guide 7 located above the cantilever top plate 11, and to the cantilever top plate 11 and / or the top plate reinforcing plate 8.

[0057] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning 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 merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this 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 this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An external anchorage structure for the cable-stayed bridge for both road and rail use, characterized in that, The cable-stayed girder external anchorage structure (100) is located on the transverse side of the upper chord of the steel truss, and the cable-stayed girder external anchorage structure (100) comprises: The cantilever top plate (11) is flush with and fixed to the top plate (12) of the upper chord of the steel truss and extends outward. The cantilever top plate (11) is provided with elliptical holes. The cable guide (7) for the cable stays to pass through has its centerline (102) eccentric to the main truss system line (101); the cable guide (7) passes through the elliptical hole; The cover plate (5) is vertically fixed to the outside of the outer node plate (14) of the upper chord; The grid-shaped structure is set between the top plate (11) of the cantilever arm and the cover plate (5), and is perpendicular to both the cover plate (5) and the outer node plate (14) of the upper chord. The cable guide (7) is inserted through and welded to the grid-shaped structure. The grid-shaped structure includes two main bearing plates and two secondary bearing plates. The two main bearing plates are closely attached to the cable guide (7) and are arranged at an angle, with the upper and lower sides being inclined and spaced apart. The two secondary bearing plates are closely attached to the cable guide (7) and are arranged at an angle, with the inner and outer sides being inclined and spaced apart. Both main bearing plates are perpendicular to the cover plate (5) and the outer node plate (14) of the upper chord. The two secondary bearing plates are vertically arranged between the two main bearing plates. The cable guide (7) is welded to one or more of the two main bearing plates and the two secondary bearing plates. The cable-stayed girder external anchorage structure (100) also includes a reinforcing structure, which includes a vertical diaphragm (13) and a horizontal diaphragm (15); the vertical diaphragm (13) and the horizontal diaphragm (15) are arranged perpendicularly and alternately inside the upper chord and in the anchorage area corresponding to the cover plate (5) and the grid structure. The cable beam truss external anchorage structure (100) also includes a top plate reinforcing plate (8) and diagonal stiffening ribs. The top plate reinforcing plate (8) is set close to the cantilever top plate (11). Several of the diagonal stiffening ribs are simultaneously perpendicular to the side wall of the cable guide (7) above the cantilever top plate (11), and the cantilever top plate (11) and / or the top plate reinforcing plate (8). The cable beam truss external anchorage structure (100) also includes a spherical anchor plate (6), which is located at the bottom opening of the cable guide (7) and is disposed on the lower surface of the cover plate (5); The cable beam truss external anchorage structure (100) also includes a support seat (17), which is perpendicular to both the cantilever top plate (11) and the outer node plate (14) of the upper chord.

2. A construction method based on the cable-stayed girder external anchorage structure according to claim 1, characterized in that, Includes the following steps: The center line (102) of the cable guide is determined based on the set lateral eccentricity distance on the outer side of the truss of the outer node plate (14) of the upper chord. According to the lateral eccentricity distance, a grid-shaped structure is set up. The grid-shaped structure is vertically fixed to the outer node plate (14) of the upper chord, and the top surface of the grid-shaped structure is flush with the top plate (12) of the upper chord. A cover plate (5) is installed perpendicular to the bottom end face of the grid structure and the outer node plate (14) of the upper chord. A cantilever top plate (11) is provided on the outside of the upper chord truss, extending outward and flush with the top plate (12) of the upper chord. The cantilever top plate (11) is fixed to the top surface of the grid structure. The cable guide (7) passes through the elliptical hole in the top plate (11) of the cantilever arm, and is installed and welded to the grid structure.

3. The construction method as described in claim 2, characterized in that: The grid-shaped structure comprises two main bearing plates and two secondary bearing plates; the grid-shaped structure is configured according to the lateral eccentricity distance, comprising: Two main bearing plates are set at an angle, closely attached to the cable guide (7), and two auxiliary bearing plates are set at an angle, closely attached to the cable guide (7), and both main bearing plates are perpendicular to the cover plate (5) and the outer node plate (14) of the upper chord. Both auxiliary pressure plates are vertically arranged between the two main pressure plates.

4. The construction method as described in claim 2, characterized in that: The cable-stayed girder external anchorage structure (100) also includes a reinforcing structure, which includes a vertical diaphragm (13) and a horizontal diaphragm (15). Before setting the grid structure, the following is included: Vertical diaphragms (13) and horizontal diaphragms (15) are arranged perpendicularly and alternately inside the upper chord and in the anchorage area corresponding to the cover plate (5) and the grid structure.

5. The construction method as described in claim 2, characterized in that: The cable-stayed girder external anchorage structure (100) also includes a top plate reinforcing plate (8) and diagonal stiffening ribs; The cable conduit (7) is inserted into and welded to the grid structure, and also includes: The top plate reinforcement plate (8) is closely attached to the top plate (11) of the cantilever arm; Several of the aforementioned diagonal stiffening ribs are simultaneously perpendicular to the side wall of the cable guide (7) above the cantilever top plate (11), and the cantilever top plate (11) and / or the top plate reinforcement plate (8).

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