A V-shaped pier-truss cable-stayed combined bridge structure and a construction method thereof

Abstract

This invention relates to the field of landscape bridge technology, and discloses a V-shaped pier-truss cable-stayed composite bridge structure and its construction method. The V-shaped pier-truss cable-stayed composite bridge structure includes piers, main beams, bridge towers, and cables. The piers include V-shaped main piers. The load of the main beam is transferred to the truss structure via the cables through the cable-stayed towers. The truss structure then transfers the force to the V-shaped main piers. The V-shaped piers provide support and constraint to the main beams through their rigid frame action. Thus, through the interconnection and support between the rigid frame structure, truss structure, and cable-stayed structure, the overall stiffness of the combined bridge structure is greater than the sum of the stiffnesses of the individual structures. This optimizes the stress on the cable-stayed towers and the overall bridge structure, allowing the V-shaped pier-truss cable-stayed composite bridge structure to reduce the tower height compared to existing cable-stayed bridges for the same span, thereby meeting the building height requirements of urban planning or enabling it to be suitable for larger bridge spans.

Description

Technical Field

[0001] This invention relates to the field of landscape bridge technology, and in particular to a V-shaped pier-truss cable-stayed composite bridge structure and its construction method. Background Technology

[0002] Currently, box girder structures are widely used in highway bridges, municipal bridges, and railway bridges due to their visual simplicity and high bending and torsional stiffness. Furthermore, the construction techniques of cast-in-place reinforced concrete continuous box girders and steel box girders are well-suited to different route types, enabling the construction of bridges with varying widths, curved sections, and ramp bridges with small curve radii, making box girder bridges particularly prevalent in bridge engineering, especially in urban areas. However, both cast-in-place reinforced concrete box girders and prestressed reinforced concrete box girders have significant self-weight, with most of their load-bearing capacity used to support their own dead load. To meet the bridge's bending capacity requirements, the cross-sectional height of the box girder is positively correlated with the bridge span, resulting in a relatively large beam height for box girder bridges.

[0003] Cable-stayed bridges, primarily composed of towers, main girders, and cables, are structural systems combining compression-bearing towers, tension-bearing cables, and bending-resistant main girders. They can be viewed as multi-span, elastically supported continuous beams where cables replace piers. This reduces bending moments within the beam, thereby lowering the main girder height, reducing structural weight, and saving materials. Furthermore, the towers and cables form a mechanical balance, resulting in high overall stiffness and stability, and excellent wind and earthquake resistance, making it a preferred option for modern bridge engineering.

[0004] However, in bridge engineering design, especially in urban bridge design, the height of the bridge superstructure is often restricted; cable-stayed bridges often have tall towers, making them difficult to use in areas with limited height. At the same time, their tall cable-stayed towers often affect the city skyline and have a certain impact on the overall urban planning. Summary of the Invention

[0005] The purpose of this invention is to provide a V-shaped pier-truss cable-stayed bridge structure to solve the problem that the high towers of existing cable-stayed bridges affect urban planning.

[0006] To achieve the above objectives, the present invention provides a V-shaped pier-truss cable-stayed composite bridge structure, comprising: The bridge pier includes a main pier and side piers; the main pier is provided with a side pier at intervals on both sides of the first direction; the main pier is a V-shaped pier. The main beam consists of two beams, each fixed to one side of the top of the main pier. Both main beams extend away from the main pier along a first direction. The side piers are located below the main beams and support them one by one. The bridge tower includes cable-stayed towers and a truss structure, both located above the main pier; the two cable-stayed towers are spaced apart and arranged opposite each other; one end of each cable-stayed tower is fixedly connected to the main pier, and the other end is inclined upward in a direction away from the other cable-stayed tower; the truss structure is located between the two cable-stayed towers and is fixedly connected to the main pier and the cable-stayed towers respectively. The cable is a series of cables located between the cable-stayed tower and the adjacent main beam, with one end of the cable anchored to the cable-stayed tower and the other end anchored to the main beam.

[0007] Furthermore, the main pier includes a pier cap, pier arm, and chord beam arranged sequentially from bottom to top; The two pier arms are symmetrically fixed to the top of the pier cap and extend upward at an angle to form a V-shaped structure, so that the main pier is a V-shaped pier. The chord beam is horizontally arranged, and its two ends in the first direction are fixedly connected to the upper ends of the two pier arms one by one.

[0008] Furthermore, the cable-stayed tower comprises a first tower body and a second tower body connected sequentially from bottom to top; The lower end of the first tower body is connected to one end of the chord beam in the first direction; the axis of the first tower body coincides with the axis of its adjacent pier arm.

[0009] Furthermore, the first tower body forms an angle θ1 with its adjacent main beam, and the second tower body forms an angle θ2 with its adjacent main beam; Where θ1≥θ2.

[0010] Furthermore, the truss structure includes an upper chord and a first web member; The upper chord members are spaced apart above the chord beam, and the two ends of the upper chord members are fixedly connected to the upper ends of the two cable-stayed towers one by one. At least two first web members are provided between the upper chord and the chord beam, with the at least two first web members spaced apart; one end of the first web member is fixedly connected to the chord beam, and the other end extends upward and is fixedly connected to the upper chord.

[0011] Furthermore, the first web member extends from bottom to top in a direction away from the other first web member.

[0012] Furthermore, the truss structure also includes a second web member; At least two second web members are provided between the first web member and the adjacent cable-stayed tower; the upper ends of any two second web members are fixedly connected to the upper chord, and the other ends are facing downward and set far apart from each other; the lower end of one second web member is fixedly connected to the middle section of the cable-stayed tower, and the lower end of the other second web member is fixedly connected to the middle section of the first web member.

[0013] Furthermore, the multiple cables between any of the cable-stayed towers and their adjacent main beams are arranged in parallel to each other.

[0014] The present invention also provides a construction method for constructing the above-mentioned V-shaped pier-truss cable-stayed composite bridge structure, which includes the following steps: S1. Construct the main pier and the side piers on both sides at the predetermined construction location; S2. Construct cable-stayed towers and truss structures in sequence above the main pier; S3. Construct the main beam in sections according to the number of cables, and anchor both ends of the cables to the corresponding main beam sections and cable-stayed towers; S4. Join the main beams constructed in sections; S5. The V-shaped pier-truss cable-stayed composite bridge structure described in the completion acceptance.

[0015] Compared with existing technologies, the V-shaped pier-truss cable-stayed composite bridge structure and its construction method provided by this invention have the following advantages: This invention provides a V-shaped pier-truss cable-stayed composite bridge structure, comprising piers, main beams, towers, and cables. Because multiple cables are installed between the cable-stayed towers and the adjacent main beams, with both ends of the cables anchored to the cable-stayed towers and the main beams respectively, a cable-stayed structure can be formed between the cable-stayed towers and cables to bear the dead and live loads of the main beams. By tilting the cable-stayed towers upwards and simultaneously outwards from the main piers, the height of the cable-stayed towers can be reduced while maintaining a large inclination angle for the cables, thus ensuring that the cables have sufficient force to resist the loads of the main beams. Furthermore, the tilted cable-stayed towers maintain the horizontal stability of the cables. The force component is converted into axial pressure transmitted along the axis of the cable-stayed tower, thus being transferred to the main pier. The main pier is connected to the truss structure, and the main pier is a V-shaped pier, so that the main pier and the truss structure are connected to form a stable structure, which jointly bears the tensile force on the cable-stayed towers on both sides of the truss structure in the first direction, thereby improving the spatial stiffness of the bridge tower. In summary, the V-shaped pier-truss cable-stayed composite bridge structure can adapt to larger bridge spans, or, for the same span distance, can reduce the height of the bridge towers compared to existing cable-stayed bridge structures, thereby meeting the building height requirements of urban planning.

[0016] The present invention provides a construction method for building the V-shaped pier-truss cable-stayed composite bridge structure by constructing it in sections and then assembling them together, so that the height of the constructed bridge meets the height requirements of urban planning. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a V-shaped pier-truss cable-stayed bridge structure according to an embodiment of the present invention; Figure 2yes Figure 1 Enlarged view of region A in the middle; Figure 3 This is a construction process of a construction method according to an embodiment of the present invention. Figure 1 ; Figure 4 This is a construction process of a construction method according to an embodiment of the present invention. Figure 2 ; Figure 5 This is a flowchart of a construction method according to an embodiment of the present invention.

[0018] In the diagram, 100 is a V-shaped pier-truss cable-stayed composite bridge structure; 1 is a pier; 11 is a main pier; 110 is the first pile foundation; 111 is a pile cap; 112 is a pier arm; 113 is a chord beam; 12 is a side pier; 120 is the second pile foundation; 2 is a main beam; 21 is the root of the main beam; 3 is a bridge tower; 31 is a cable-stayed tower; 311 is the first tower body; 312 is the second tower body; 32 is a truss structure; 321 is the top chord; 322 is the first web member; 323 is the second web member; and 4 is a cable. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order or hierarchy.

[0021] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0024] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a V-shaped pier-truss cable-stayed composite bridge structure 100, which includes a pier 1, a main beam 2, a bridge tower 3, and a cable 4; The bridge pier 1 includes a main pier 11 and side piers 12; the main pier 11 is provided with a side pier 12 at intervals on both sides of the first direction X; the main pier 11 is a V-shaped pier; It should be noted that the first direction X is the extension direction of the bridge, that is, the driving direction of the bridge.

[0025] The two main beams 2 are respectively fixed on both sides of the top of the main pier 11; the two main beams 2 extend away from the main pier along the first direction, and the side piers 12 are located below the main beams 2 and support the main beams 2 one by one; The bridge tower 3 includes cable-stayed towers 31 and truss structures 32, both located above the main pier 11; the two cable-stayed towers 31 are spaced apart and arranged opposite each other; one end of each cable-stayed tower 31 is fixedly connected to the main pier 11, and the other end is inclined upward in a direction away from the other cable-stayed tower 31; the truss structure 32 is located between the two cable-stayed towers 31 and is fixedly connected to the main pier 11 and the cable-stayed towers 31 respectively. It is understood that the other end of the cable-stayed tower 31 is inclined upward in a direction away from the other cable-stayed tower 31, which means that while the cable-stayed tower 31 extends upward, it also extends in a direction away from the other cable-stayed tower 31; so that the projection of the upper end of the cable-stayed tower 31 in the vertical direction is located outside the main pier 11.

[0026] Multiple cables 4 are provided between the cable-stayed tower 31 and the adjacent main beam 2. One end of the cable 4 is anchored to the cable-stayed tower 31 and the other end is anchored to the main beam 2.

[0027] It should be noted that in conventional cable-stayed bridges, relatively tall towers are typically required to ensure the bridge's span capacity and deflection. This is because the taller the tower, the greater the inclination angle of the cables, resulting in a larger vertical component of the force exerted by the cables—that is, the greater the force required to lift the main girder—and thus higher efficiency. Conversely, the shorter the tower, the smaller the inclination angle of the cables, resulting in a smaller vertical component of the force exerted by the cables—that is, the smaller the force required to lift the main girder—and thus lower efficiency.

[0028] Based on the above technical solution, since multiple cables 4 are provided between the cable-stayed tower 31 and the adjacent main beam 2, and the two ends of the cables 4 are respectively anchored to the cable-stayed tower 31 and the main beam 2, a cable-stayed structure can be formed by the cable-stayed tower 31 and the cables 4 to bear the dead load and live load of the main beam 2; by tilting the cable-stayed tower 31 upward and simultaneously outward towards the main pier 11, the height of the cable-stayed tower 31 can be reduced while the cables 4 still have a large tilt angle, thereby ensuring that the cables 4 have sufficient component force to resist the load of the main beam 2; and the tilted cable-stayed tower 31 converts the horizontal component force of the cables 4 into force transmitted along the axis of the cable-stayed tower 31. The axial pressure is transferred to the main pier 11; the main pier 11 is connected by the truss structure 32, and the main pier 11 is a V-shaped pier, so that the main pier 11 and the truss structure 32 are connected to form a stable structure, which jointly bears the tensile force on the cable-stayed towers 31 on both sides of the truss structure 32 in the first direction X, thereby improving the spatial stiffness of the bridge towers 3; in summary, the V-shaped pier-truss cable-stayed composite bridge structure 100 can adapt to larger bridge spans, or, for the same span distance, can reduce the height of the bridge towers compared with existing cable-stayed bridge structures, thereby meeting the building height requirements of urban planning.

[0029] Furthermore, such as Figure 1 and Figure 2 As shown, the main pier 11 includes a pier cap 111, a pier arm 112, and a chord beam 113 arranged sequentially from bottom to top; The two pier arms 112 are symmetrically fixed to the top of the pier cap 111 and extend upward at an incline to form a V-shaped structure, so that the main pier is a V-shaped pier. The chord beam 113 is horizontally arranged, and its two ends in the first direction X are fixedly connected to the upper ends of the two pier arms 112 respectively.

[0030] Understandably, the two upwardly inclined pier arms 112 are fixedly connected to the horizontally positioned chord beam 113, forming a stable V-shaped structure. This allows the main pier to form the required V-shaped pier, enabling the vertical and horizontal forces from the bridge tower 3 and the main beam 2 to be directly transmitted to the pier cap 111 through the axial force of the pier arms 112. Compared to the force transmission method of a straight pier column under bending stress, this provides better overall stability and higher stiffness. Furthermore, the inherent V-shaped geometry offers excellent resistance to horizontal loads such as wind loads and seismic forces.

[0031] Furthermore, compared to straight piers, the upper surface of the chord beam 113 has a larger area thanks to the V-shaped structure of the two pier arms 112, thus providing a larger support surface for the cable-stayed tower 31 and the main beams 2 on both sides of the first direction X. The inclined pier arms 112 are also advantageous in bearing and transmitting the horizontal thrust from the inclined cable-stayed tower 31.

[0032] Furthermore, such as Figure 1 and Figure 2 As shown, the cable-stayed tower 31 includes a first tower body 311 and a second tower body 312 connected sequentially from bottom to top; The lower end of the first tower body 311 is connected to one end of the chord beam 113 in the first direction X; the axis of the first tower body 311 coincides with the axis of its adjacent pier arm 112.

[0033] It is understandable that the arrangement of the first tower body 311's axis coinciding with the axis of its adjacent pier arm 112 allows the tension transmitted from the cable 4 to the cable-stayed tower 31 to be directly transmitted to the pier arm 112, which is parallel to its axis, through the first tower body 311 in an axial compression manner. The force transmission path is shorter and more direct, which can reduce the bending stress and stress concentration in the connection area of ​​the cable-stayed tower 31, the chord beam 113 and the pier arm 112.

[0034] Preferably, such as Figure 1 and Figure 2 As shown, the extension direction of the first tower body 311 and the extension direction of the second tower body 312 are both straight.

[0035] Understandably, compared to a curved tower of the same height, a straight tower exhibits higher stiffness and stability efficiency under axial compression, which is beneficial for controlling the compressive deformation and lateral displacement of the cable-stayed tower 31 itself, thereby improving the overall stiffness of the entire bridge. Furthermore, compared to a curved tower, a straight-lined tower can shorten the length of the cables 4, saving on bridge construction costs.

[0036] Furthermore, such as Figure 1 and Figure 2 As shown, the first tower body 311 forms an angle θ1 with its adjacent main beam 2, and the second tower body 312 forms an angle θ2 with its adjacent main beam 2. Where θ1≥θ2.

[0037] It is understandable that the angle θ1 between the first tower body 311 and the adjacent main beam 2 is greater than the angle θ2 between the second tower body 312 and the adjacent main beam 2. That is, the angle between the first tower body 311 and the horizontal plane is larger, thus it has greater vertical support stiffness to provide sufficient support for the second tower body 312 above it. By setting the first tower body 311 and 312 at different angles to the main beam 2, the cable-stayed tower 31 can have a certain vertical support strength while reducing its height by tilting outward.

[0038] Furthermore, such as Figure 1 and Figure 2 As shown, the truss structure 32 includes an upper chord 321 and a first web member 322; The upper chord members 321 are spaced apart above the chord beam 113, and the two ends of the upper chord members 321 are fixedly connected to the upper ends of the two cable-stayed towers 31 respectively. At least two first web members 322 are provided between the upper chord 321 and the chord beam 113. The at least two first web members 322 are spaced apart. One end of the first web member 322 is fixedly connected to the chord beam 113, and the other end extends upward and is fixedly connected to the upper chord 321.

[0039] It is understandable that by fixing the two ends of the upper chord 321 to the upper ends of the two cable-stayed towers 31 one by one, and connecting the upper chord 321 and the chord beam 113 through at least two first web members 322, the upper chord 321, the cable-stayed towers 31, the chord beam 113, and the first web members 322 are connected to form a spatial combined force-bearing structure, thereby connecting the rigid frame system of the main pier 11, the cable-stayed system of the cable-stayed towers 31, and the upper chord 321 with the first web members. The spatial truss system of 322 is organically integrated, enabling the cable-stayed tower 31 to transfer the load of the main beam 2 from the cable 4 to the upper chord 321. The upper chord 321 then transfers the load through the first web member 322 to the chord beam 113 of the main pier, and further to the pier cap 111. The main pier 11, through its V-shaped rigid frame, provides constraints and support to the cable-stayed tower 31 and the truss structure 32 above it, thereby enabling the three to depend on each other and work together to form a stable structure with an overall stiffness much greater than the sum of the individual parts.

[0040] Preferably, in this embodiment, two first web members 322 are provided between the upper chord 321 and the chord beam 113. The two first web members 322 are spaced apart and arranged opposite to each other to meet the connection and force transmission requirements between the upper chord 321 and the chord beam 113, and the opposite arrangement ensures uniform force distribution.

[0041] In other embodiments, two sets of first web members 322 may be provided between the upper chord 321 and the chord beam 113. The two sets of first web members 322 are spaced apart and symmetrically arranged. Each set of first web members 322 contains at least two first web members 322, thereby enhancing the support strength of the truss structure 32. This ensures that when the distance between the two cable-stayed towers 31 is large or the tops of the two pier arms 112 of the V-shaped pier are far apart, the truss structure 32 has sufficient strength to connect the cable-stayed towers 31 and the V-shaped pier, thus ensuring the overall reliability.

[0042] Preferably, such as Figure 1 and Figure 2 As shown, the upper chord 321 has an upwardly convex arc shape.

[0043] Understandably, the upper chord 321 is an upward-convex arc shape. This upward-convex arc shape allows space for the upper chord 321 to sag due to its own weight, preventing the upper chord 321 from bending due to sag and being strained at both ends, thus ensuring the structural strength of the upper chord 321.

[0044] Furthermore, such as Figure 1 and Figure 2 As shown, the first web member 322 extends from bottom to top in a direction away from the other first web member 322.

[0045] It is understandable that the two first web members 322 are arranged in an outwardly inclined manner, so that they can form a spatial frame together with the upper chord member 321 above and the lower chord beam 113 below, so as to have high transverse bridge thrust stiffness and torsional stiffness, and can effectively transfer the horizontal force at the upper end of the cable-stayed tower 31 to the chord beam 113 through the axial force of the first web members 322.

[0046] Furthermore, such as Figure 1 and Figure 2 As shown, the truss structure 32 also includes a second web member 323; At least two second web members 323 are provided between the first web member 322 and the adjacent cable-stayed tower 31; the upper ends of any two second web members 323 are fixedly connected to the upper chord 321, and the other ends are downward and far apart from each other; the lower end of one second web member 323 is fixedly connected to the middle section of the cable-stayed tower 31, and the lower end of the other second web member 323 is fixedly connected to the middle section of the first web member 322.

[0047] It is understandable that by setting the second web member 323, multiple triangular structures can be formed between the cable-stayed tower 31, the upper chord 321, and the first web member 322. This spatial triangular structure of the truss system distributes the load to more members and nodes, greatly enhancing the lateral stiffness, torsional performance, and structural redundancy of the truss structure 32 and even the entire bridge tower 3. In this embodiment, two second web members 323 are set between the first web member 322 and its adjacent cable-stayed tower 31, so that the two second web members 323 respectively connect the upper chord 321 and the cable-stayed tower 31, and the two second web members 323 are connected to form multiple triangular structures, thereby achieving the effect of load distribution. In other embodiments, the number of second web members 323 can be comprehensively set according to factors such as the bridge span and the distance between the two cable-stayed towers 31.

[0048] Furthermore, the addition of a second web member 323 significantly increases the static indeterminate order of the structure. Even if some members in the truss structure 32 are damaged, the load can be redistributed through other paths, greatly enhancing the structure's integrity, robustness, and resistance to progressive collapse, and significantly improving the safety reserve.

[0049] Preferably, such as Figure 1 and Figure 2 As shown, the lower end of one of the second web members 323 is fixedly connected to the connection position of the first tower body 311 and the second tower body 312. Furthermore, the upper end of the second abdominal rod 323 is fixedly connected to the upper end of another second abdominal rod 323, and the lower end of the other second abdominal rod 323 is fixedly connected to the middle section of the first abdominal rod 322.

[0050] It is understandable that, since the connection between the first tower body 311 and the second tower body 312 is an important force transmission node, stress concentration and complex bending moments are likely to occur at this location. Fixing the lower end of one of the second web members 323 to this location can add a lateral support to this location, so as to directly share and transfer part of the lateral horizontal force and bending moment borne by this area, and significantly improve its stress state.

[0051] Connecting the lower end of the second web member 323 to the middle section of the first web member 322 is equivalent to adding a reliable intermediate support to the first web member 322, which is an intermediate force transmission member; this greatly improves its stability bearing capacity and resistance to local buckling as an intermediate force transmission member.

[0052] Furthermore, such as Figure 1 and Figure 2 As shown, the multiple cables 4 between any of the cable-stayed towers 31 and the adjacent main beam 2 are arranged in parallel to each other.

[0053] It is understandable that the parallel arrangement of multiple cables 4 not only provides elastic support for the main beam 2, but also improves the visual quality of the V-shaped pier-truss cable-stayed composite bridge structure 100. In some other embodiments, depending on the actual conditions of the bridge, the multiple cables 4 may also be arranged non-parallel to each other, so as to make the load distribution more uniform, thereby improving the load-bearing capacity of the cable-stayed structure.

[0054] like Figures 3-5 As shown, an embodiment of the present invention provides a construction method for constructing the aforementioned V-shaped pier-truss cable-stayed composite bridge structure 100, which includes the following steps: S1. Construct the main pier 11 and the side piers 12 on both sides at the predetermined construction location; S2. Construct a cable-stayed tower 31 and a truss structure 32 in sequence above the main pier 11; S3. Construct the main beam 2 segments according to the number of cables 4, and anchor both ends of the cables 4 to the corresponding main beam 2 segments and cable-stayed towers 31; S4. Close the main beam 2 constructed in sections; S5. The V-shaped pier-truss cable-stayed composite bridge structure 100 as described in the completion acceptance.

[0055] Based on the above technical solution, the V-shaped pier-truss cable-stayed composite bridge structure 100 is constructed by assembling the sections after construction, so that the height of the constructed bridge meets the height requirements of urban planning.

[0056] Preferably, such as Figure 3 As shown, step S1 includes: Step S1-1: Construct the first pile foundation 110 at the designed location of the main pier 11; Construct the second pile foundation 120 at the designed location of the side pier 12; Step S1-2: Construct the pile cap 111 above the first pile foundation 110; A pier is constructed above the second pile foundation 120 to form the side pier 12; Step S1-3: Construct the construction pier arm 112 and the chord beam 113 in sequence above the pier cap 111, and form the main beam root 21 on both sides of the chord beam 113 in the first direction.

[0057] It is understandable that the bridge pier 1 is gradually constructed through the above construction, and the main beam root 21 is set up for the construction of the main beam 2.

[0058] Preferably, such as Figure 4 As shown, step S3 specifically includes: Step S3-1: Divide the main beam 2 into segments according to the number of cables 4; Step S3-2: On both sides of the main pier 11 in the first direction, the main beam 2 is constructed in segments using the cantilever construction technique; and the two ends of the cable 4 are anchored to the corresponding segments of the main beam 2 and the cable-stayed tower 31. Step S3-3: Make the first adjustment of the cable tension and monitor the structural deformation and internal forces of the main beam 2 and cable 4 in real time.

[0059] It is understandable that using cantilever construction technology to construct the main beam 2 in sections facilitates the adjustment of the tension of the cables 4 during construction, thereby improving the reliability of the bridge structure.

[0060] Preferably, the step between step S4 and step S5 further includes: Step S4-1: Construct the bridge deck paving and ancillary works, and then perform a second adjustment of the tension of the four cables.

[0061] It is understandable that after the bridge deck paving and ancillary works are completed and the dead load of the bridge is met, adjusting the tension of cable 4 again is beneficial to improving the reliability of the cable-stayed system.

[0062] Preferably, to meet the requirements of a widened bridge, during construction, the appropriate transverse width of the main beam 2, the number of faces of the cable 4, and the number of transverse sections of the truss structure 32 can be selected according to the needs of the bridge.

[0063] Preferably, to ensure the support strength of the V-shaped pier-truss cable-stayed composite bridge structure 100, the beam height of the main beam 2 in the longitudinal direction and the height of the upper chord 321 in the vertical direction can be set to equal height or variable height as needed.

[0064] Preferably, during construction, the main beam 2 can adopt a solid web structure or a hollow web structure.

[0065] The working process of this invention is as follows: When a motor vehicle or other live load travels on the main beam 2, the force exerted by the live load on the main beam 2 forms a tensile force on the cable 4, which is then transmitted to the cable-stayed tower 31 through the cable 4. The load on the cable-stayed tower 31 is partially transmitted directly to the main pier 11 via the second tower body 312 and the first tower body 311, and then downwards to the pile cap 111 via the pier arm 112, so as to the pile foundation below; the other part acts on the upper chord 321, and then is gradually transmitted downwards to the chord beam 113 via the first web member 322 and the second web member 323, and then downwards to the pile cap 111 via the pier arm 112. The second web member 323, which connects the first tower body 311 and the second tower body 312, can distribute part of the force on the second tower body 312 to the upper chord 321 and the first web member 322, so as to optimize the stress on the cable-stayed tower 31.

[0066] In summary, this invention provides a V-shaped pier-truss cable-stayed composite bridge structure 100, which includes a pier 1, a main beam 2, a tower 3, and cables 4. Since multiple cables 4 are provided between the cable-stayed tower 31 and the adjacent main beam 2, and both ends of the cables 4 are anchored to the cable-stayed tower 31 and the main beam 2 respectively, a cable-stayed structure can be formed between the cable-stayed tower 31 and the cables 4 to bear the dead and live loads of the main beam 2. By tilting the cable-stayed tower 31 upwards and simultaneously outwards from the main pier 11, the height of the cable-stayed tower 31 can be reduced while the cables 4 still have a large inclination angle, thereby ensuring that the cables 4 have sufficient force to resist the load of the main beam 2. Furthermore, the tilted cable-stayed tower 31... The horizontal component of the cable 4 is converted into axial pressure transmitted along the axis of the cable-stayed tower 31, and then transmitted to the main pier 11. The main pier 11 is connected by the truss structure 32, and the main pier 11 is a V-shaped pier, so that the main pier 11 and the truss structure 32 are connected to form a stable structure, which jointly bears the tensile force on the cable-stayed towers 31 on both sides of the truss structure 32 in the first direction X, thereby improving the spatial stiffness of the bridge tower 3. In summary, the V-shaped pier-truss cable-stayed composite bridge structure 100 can adapt to larger bridge spans, or, for the same span distance, can reduce the height of the bridge towers compared to existing cable-stayed bridge structures, thereby meeting the building height requirements of urban planning.

[0067] This invention also provides a construction method for constructing the V-shaped pier-truss cable-stayed composite bridge structure 100 by constructing it in sections and then assembling them together, so that the height of the constructed bridge meets the height requirements of urban planning.

[0068] It should also be noted that 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 limitation, 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.

[0069] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0070] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

[0071] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A V-shaped pier-truss cable-stayed composite bridge structure (100), characterized in that, include: The bridge pier (1) includes a main pier (11) and side piers (12); the main pier (11) is provided with a side pier (12) at intervals on both sides in a first direction; the main pier (11) is a V-shaped pier; The main beams (2) are two beams respectively fixed on both sides of the top of the main pier (11); both main beams (2) extend away from the main pier (11) along the first direction, and the side piers (12) are located below the main beams (2) and support the main beams (2) one by one. The bridge tower (3) includes cable-stayed towers (31) and truss structures (32) both located above the main pier (11); the two cable-stayed towers (31) are spaced apart and arranged opposite each other; one end of each cable-stayed tower (31) is fixedly connected to the main pier (11), and the other end is inclined upward in a direction away from the other cable-stayed tower (31); the truss structure (32) is located between the two cable-stayed towers (31) and is fixedly connected to the main pier (11) and the cable-stayed towers (31) respectively; The cable (4) consists of multiple cables located between the cable-stayed tower (31) and the adjacent main beam (2), with one end of the cable (4) anchored to the cable-stayed tower (31) and the other end anchored to the main beam (2).

2. The V-shaped pier-truss cable-stayed composite bridge structure (100) as described in claim 1, characterized in that, The main pier (11) includes a pier cap (111), a pier arm (112), and a chord beam (113) arranged sequentially from bottom to top. The two pier arms (112) are symmetrically fixed at the top of the pier (111) and extend upward at an incline to form a V-shaped structure, so that the main pier (11) is a V-shaped pier; The chord beam (113) is horizontally arranged, and its two ends in the first direction are fixedly connected to the upper ends of the two pier arms (112) respectively.

3. The V-shaped pier-truss cable-stayed composite bridge structure (100) as described in claim 2, characterized in that, The cable-stayed tower (31) includes a first tower body (311) and a second tower body (312) connected sequentially from bottom to top. The lower end of the first tower body (311) is connected to one end of the chord beam (113) in the first direction; the axis of the first tower body (311) coincides with the axis of its adjacent pier arm (112).

4. The V-shaped pier-truss cable-stayed composite bridge structure (100) as described in claim 3, characterized in that, The first tower body (311) forms an angle θ1 with its adjacent main beam (2), and the second tower body (312) forms an angle θ2 with its adjacent main beam (2); Where θ1≥θ2.

5. The V-shaped pier-truss cable-stayed composite bridge structure (100) as described in claim 2, characterized in that, The truss structure (32) includes an upper chord (321) and a first web member (322). The upper chord (321) is spaced above the chord beam (113), and the two ends of the upper chord (321) are fixedly connected to the upper ends of the two cable-stayed towers (31) respectively. At least two first web members (322) are provided between the upper chord (321) and the chord beam (113), and the at least two first web members (322) are spaced apart; one end of the first web member (322) is fixedly connected to the chord beam (113), and the other end extends upward and is fixedly connected to the upper chord (321).

6. The V-shaped pier-truss cable-stayed composite bridge structure (100) as described in claim 5, characterized in that, The first web member (322) extends from bottom to top in a direction away from the other first web member (322).

7. The V-shaped pier-truss cable-stayed composite bridge structure (100) as described in claim 5, characterized in that, The truss structure (32) also includes a second web member (323); At least two second web members (323) are provided between the first web member (322) and the adjacent cable-stayed tower (31); the upper ends of any two second web members (323) are fixedly connected to the upper chord (321), and the other ends are downward and far apart from each other; the lower end of one second web member (323) is fixedly connected to the middle section of the cable-stayed tower (31), and the lower end of the other second web member (323) is fixedly connected to the middle section of the first web member (322).

8. The V-shaped pier-truss cable-stayed composite bridge structure (100) as described in claim 1, characterized in that, Multiple cables (4) between any of the cable-stayed towers (31) and its adjacent main beam (2) are arranged parallel to each other.

9. A construction method for constructing a V-shaped pier-truss cable-stayed composite bridge structure (100) as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Construct the main pier (11) and the side piers (12) on both sides at the predetermined construction location. S2. A cable-stayed tower (31) and a truss structure (32) are constructed in sequence above the main pier (11). S3. The main beam (2) is constructed in sections according to the number of cables (4), and the two ends of the cables (4) are anchored to the corresponding main beam (2) sections and cable-stayed towers (31). S4. Close the main beam (2) constructed in sections; S5. The V-shaped pier-truss cable-stayed composite bridge structure (100) as described in the completion acceptance.

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