A rigid tie bar for a flying saucer arch bridge improves the force transmission path

Abstract

The present application relates to the technical field of bridge, in particular to a rigid tie bar of flying swallow type arch bridge for improving force transmission path, comprising truncated cross beam, common cross beam, transition longitudinal beam and side beam; the transition longitudinal beam passes through each truncated cross beam along the longitudinal direction of the bridge; the two ends of the transition longitudinal beam are respectively connected with side beams, the two ends of the transition longitudinal beam respectively pass through at least one common cross beam corresponding to the end and extend in the direction away from the arch beam intersection area, the end of the transition longitudinal beam passing out of the common cross beam is used for connecting with the longitudinal rib of the bridge deck; at least one longitudinal beam support is arranged at the bottom of the transition longitudinal beam, the position of the longitudinal beam support along the longitudinal direction of the bridge is located within the range of the arch beam intersection area, and the longitudinal beam support is used for connecting with the arch rib. The present application can overcome the technical problems that the force transmission path of the rigid tie bar of the existing arch bridge in the arch beam intersection area is unreasonable, the local rigidity is insufficient and the stress is too large, and the driving smoothness and safety are reduced.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, and in particular to a rigid tie rod for a swallow-shaped arch bridge that improves the force transmission path. Background Technology

[0002] Existing thrust-free, tie-bar-less mid-span arch bridges rely on side beams as tie beams to counteract the thrust at the arch base. The main beam structure itself acts as the tie beam for the arch bridge, hence it is also called a steel tie beam or rigid tie beam. To ensure the tie beams balance the thrust of the arch ribs without eccentricity, the centerline of the side beams of the rigid tie beams needs to coincide with the centerline of the corresponding side arch ribs. Therefore, designers create arch-beam intersection zones on the rigid tie beams, allowing the arch ribs to pass directly through these intersection zones. To avoid interference between the arch ribs and the bridge deck and the crossbeams in the rigid tie beams, the bridge deck and the arch... The sections corresponding to the beam-beam intersections require openings, and the connections between the crossbeams and edge beams within the arch-beam intersection area also need to be cut off. To maintain the longitudinal connection between the cut-off crossbeams and other uncut ordinary crossbeams, transition longitudinal beams are also installed within the arch-beam intersection area. These transition longitudinal beams pass through each cut-off crossbeam along the longitudinal direction of the bridge, with their ends connected to the two ordinary crossbeams closest to the arch rib intersection area. This allows the load on the cut-off crossbeams to be transferred through the transition beams to the ordinary crossbeams, and then through the ordinary crossbeams to the edge beams. However, this construction leads to the following problems: (1) The force on the end ordinary beam connected to the transition longitudinal beam will be much greater than that on the other ordinary beams not connected to the transition longitudinal beam, making the design of the ordinary beam more difficult.

[0003] (2) In the prior art, the ordinary crossbeams that intersect with the transition longitudinal beams are all I-shaped sections, and their out-of-plane torsional stiffness is small. It is difficult to ensure the bridge deck stiffness in the area where the transition longitudinal beams intersect with the ordinary crossbeams, which will cause a decrease in the ride comfort in the arch beam intersection area.

[0004] (3) The longitudinal span of the transition beam in the arch beam intersection area is large, which makes it difficult for the stiffness of the transition beam to meet the design and use requirements.

[0005] (4) Under the action of operational load, stress concentration is likely to occur at the edge of the arch beam intersection area, and the stress in the transition area between the ordinary crossbeam and the edge beam is large, which affects the structural safety of the rigid tie rod.

[0006] To address the aforementioned issues, it is necessary to propose a novel rigid tie rod structure suitable for thrustless, tie rod-less, mid-span arch bridges. Summary of the Invention

[0007] The purpose of this invention is to overcome the technical problems of existing rigid tie rods in arch bridges having unreasonable force transmission paths in the arch-beam intersection area, insufficient local stiffness and excessive stress, which lead to a decrease in driving smoothness and safety, and to provide a swallow-shaped rigid tie rod for arch bridges that improves the force transmission path.

[0008] In a first aspect, the present invention provides a rigid tie rod for a swallow-shaped arch bridge with improved force transmission path, comprising truncated crossbeams, ordinary crossbeams, and transition longitudinal beams; at least two truncated crossbeams are spaced apart along the longitudinal direction of the bridge at the arch-beam intersection area, and at least two ordinary crossbeams are spaced apart along the longitudinal direction on both sides of the arch-beam intersection area, with side beams connected to both ends of the ordinary crossbeams; the transition longitudinal beams pass through each truncated crossbeam along the longitudinal direction of the bridge, with both ends of the transition longitudinal beams connected to the corresponding ordinary crossbeams; both ends of the transition longitudinal beams pass through at least one corresponding ordinary crossbeam and extend in a direction away from the arch-beam intersection area, with the end of the transition longitudinal beam extending out of the ordinary crossbeam for connection with the longitudinal rib of the bridge deck; at least one longitudinal beam support is provided at the bottom of the transition longitudinal beam, the longitudinal beam support being located within the arch-beam intersection area along the longitudinal direction of the bridge, and the longitudinal beam support being used for connection with the arch rib.

[0009] The rigid tie rods of the swallow-shaped arch bridge with improved force transmission path in this scheme have the following stress characteristics under bridge deck loads: (1) This scheme has a clear and specific force transmission path in the arch-beam intersection area: the bridge deck and train load are first transmitted to the cut-off crossbeam through the bridge deck, and the cut-off crossbeam then transmits the load along the transverse direction to the transition longitudinal beam. The transition longitudinal beam further transmits the load to the ordinary crossbeams at both ends in the form of vertical shear force and bending moment, and the ordinary crossbeam then transmits the load to the side beam in the form of shear force and torque.

[0010] (2) By setting a longitudinal beam support at the bottom of the transition longitudinal beam, the vertical load on the transition longitudinal beam can be transferred to the arch rib, and the span of the transition longitudinal beam can be reduced significantly (for example, if a longitudinal beam support is set in the middle of the transition longitudinal beam, the span of the transition longitudinal beam can be halved). This can not only significantly reduce the internal force of the transition longitudinal beam, but also greatly improve the structural stiffness of the bridge in the arch-beam intersection area.

[0011] (3) The end of the transition longitudinal beam passes through the ordinary crossbeam and is connected to the longitudinal reinforcement of the bridge deck. It can provide sufficient torsional strength for the location where the stiffness of the bridge deck changes greatly, thereby preventing excessive external force on the bridge deck. This can further improve the safety of the bridge structure and improve the smoothness and safety of vehicles traveling in the arch-beam intersection area.

[0012] Preferably, the end of the transition longitudinal beam passes through at least two ordinary crossbeams, and at least one of the ordinary crossbeams through which the transition longitudinal beam passes is a box girder.

[0013] This scheme can enhance the torsional resistance of ordinary crossbeams to better resist the bending moment transmitted by the transition longitudinal beams, thereby ensuring the safety of the structure. At the same time, compared with the scheme of using all I-beams for ordinary crossbeams, the higher strength and stiffness of the box girder can also help reduce the number of ordinary crossbeams, thereby simplifying the connection design between ordinary crossbeams and transition longitudinal beams.

[0014] Preferably, a rounded transition is provided at the connection between the ordinary crossbeam and the edge beam.

[0015] This solution can alleviate and improve the stress concentration at the connection between ordinary beams and edge beams, thereby ensuring the safety of the structure.

[0016] Preferably, the arc transition diameter between the ordinary crossbeams and the edge beams of the box girder is larger than the arc transition diameter between the other ordinary crossbeams and the edge beams.

[0017] The inventors of this invention discovered through finite element analysis that when a box girder is used for the ordinary crossbeam, the stress at the connection between it and the edge beam will increase; therefore, this solution further increases the arc transition diameter between the ordinary crossbeam and the edge beam to alleviate and improve the stress concentration phenomenon.

[0018] Preferably, the portion of the transition longitudinal beam that extends beyond the ordinary crossbeam is a variable-height section, and the cross-sectional height of the variable-height section decreases in the direction away from the intersection area of ​​the arch beam.

[0019] This solution helps to achieve a uniform transition of bridge deck stiffness along the longitudinal direction, thereby further improving the ride comfort and safety of vehicles traveling in the arch-beam intersection area.

[0020] Preferably, the longitudinal beam support is located at the intersection of the transition longitudinal beam and the cut-off transverse beam.

[0021] This design places the longitudinal beam supports in the intersection area, enabling the longitudinal beam supports to more directly bear and transmit the vertical loads of the transition longitudinal beam and the cut-off crossbeam, thus making the force transmission path shorter and clearer; at the same time, the stiffness of the intersection area between the transition longitudinal beam and the cut-off crossbeam is relatively large, and placing the longitudinal beam supports here is also conducive to improving the stability of the structure.

[0022] Preferably, the longitudinal beam support is located in the middle of the longitudinal direction of the bridge, near the intersection of the arch and beam.

[0023] When the transition longitudinal beam deflects, the maximum deflection along the longitudinal direction of the bridge tends to occur in the middle of the arch-beam intersection area. Therefore, this scheme recommends that the longitudinal beam support be located near the middle of the arch-beam intersection area along the longitudinal direction of the bridge. This can more effectively reduce the bending moment on the transition longitudinal beam, thereby improving the safety and load-bearing capacity of the structure.

[0024] Preferably, one or more of the transition longitudinal beams, truncated crossbeams, and ordinary crossbeams are made of I-beams.

[0025] Preferably, the width of the upper flange of the end of the transition longitudinal beam away from the arch beam intersection area decreases in the direction away from the arch beam intersection area.

[0026] This solution helps to further improve the uniformity of bridge deck stiffness transition along the longitudinal direction, thereby further improving the ride comfort and safety of vehicles traveling in the arch-beam intersection area.

[0027] In a second aspect, the present invention provides an arch bridge, including arch ribs and bridge deck, and also includes a rigid tie rod for the swallow-shaped arch bridge of the present invention to improve the force transmission path.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a rigid tie rod for a flying swallow arch bridge that improves the force transmission path. By setting longitudinal beam supports at the bottom of the transition longitudinal beam and allowing both ends of the transition longitudinal beam to pass through the side of the ordinary crossbeam, the bridge has a clear and defined force transmission path in the arch-beam intersection area. This can significantly improve the local stiffness of the bridge in the arch-beam intersection area and reduce the stress level of the bridge in the arch-beam intersection area, thereby improving the safety of the bridge structure.

[0029] 2. The improved force transmission path of the swallow-shaped arch bridge rigid tie rod of the present invention can further set the two ends of the transition longitudinal beam as variable height sections, thereby achieving a uniform transition of bridge deck stiffness along the longitudinal direction, which can improve the ride comfort and safety of vehicles traveling in the arch-beam intersection area.

[0030] 3. The present invention provides an arch bridge that adopts the swallow-shaped rigid tie rod of the present invention to improve the force transmission path, which can significantly improve the local stiffness of the bridge in the arch-beam intersection area, reduce the stress level of the bridge in the arch-beam intersection area, and has higher safety. Attached Figure Description

[0031] Figure 1 This is a top view schematic diagram of a rigid tie rod for a swallow-shaped arch bridge, which improves the force transmission path according to the present invention. Figure 1 ; Figure 2 This is a top view schematic diagram of a rigid tie rod for a swallow-shaped arch bridge, which improves the force transmission path according to the present invention. Figure 2 ; Figure 3 This is a partially enlarged top view of the rigid tie rod structure of a swallow-shaped arch bridge according to the present invention, which improves the force transmission path. Figure 4 This is a side view structural schematic diagram of a rigid tie rod for a swallow-shaped arch bridge that improves the force transmission path according to the present invention. Figure 5 This is a schematic diagram of the full-bridge finite element model in Example 1; Figure 6 This is a schematic diagram of the calculation results of the full-bridge finite element model in Example 1. Figure 1 ; Figure 7 This is a schematic diagram of the calculation results of the full-bridge finite element model in Example 1. Figure 2 ; Figure 8 This is a schematic diagram of the calculation results of the full-bridge finite element model in Example 1. Figure 3 ; Figure 9This is a schematic diagram of the calculation results of the full-bridge finite element model in Example 1. Figure 4 ; Figure 10 This is a schematic diagram of a local fine finite element model in Example 1; Figure 11 This is a schematic diagram of the calculation results of the local fine finite element model in Example 1; icon: 1-Cut-off beam; 2-Ordinary beam; 21-Circular transition; 3-Transition longitudinal beam; 31-Longitudinal beam support; 32-Variable height section; 4-Side beam; 5-Arch rib; 6-Bridge deck. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0033] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0034] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0035] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0036] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0037] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0038] Example 1 like Figures 1 to 4 As shown, a rigid tie rod for a swallow-shaped arch bridge with improved force transmission path includes a truncated crossbeam 1, a regular crossbeam 2, a transition longitudinal beam 3, and a side beam 4.

[0039] The length of the side beam 4 is set along the longitudinal direction of the bridge, and the two side beams 4 are distributed at intervals along the transverse direction of the bridge.

[0040] The length of the truncated crossbeam 1 is continuously set along the transverse direction of the bridge to make the force transmission more uniform and reasonable; multiple truncated crossbeams 1 are distributed at intervals along the longitudinal direction of the bridge in the arch beam intersection area, and their two ends are cut off and not directly connected to the side beam 4.

[0041] The length of the ordinary crossbeam 2 is continuously set along the transverse direction of the bridge, so that the force transmission is more uniform and reasonable. Multiple ordinary crossbeams 2 are distributed at intervals along the longitudinal direction of the bridge on both sides of the arch beam intersection area. Compared with the cut-off crossbeam 1, the two ends of the ordinary crossbeam 2 are not cut off, but are connected to the corresponding end side beams 4 respectively.

[0042] The transition longitudinal beam 3 is set along the longitudinal direction of the bridge. The transition longitudinal beam 3 passes through each truncated crossbeam 1 along the longitudinal direction of the bridge, and its two ends each pass through at least one corresponding ordinary crossbeam 2, extending in a direction away from the intersection area of ​​the arch and beam. For example... Figures 2 to 4 As shown, the two ends of the transition longitudinal beam 3 pass through four ordinary crossbeams 2 respectively, and the end of the transition longitudinal beam 3 that passes through the ordinary crossbeams 2 continues to extend a distance away from the arch beam intersection area. The end of the transition longitudinal beam 3 that passes through the ordinary crossbeams 2 is connected to the longitudinal rib of the bridge deck 6.

[0043] At least one longitudinal beam support 31 is provided at the bottom of the transition longitudinal beam 3. The longitudinal beam support 31 is located in the area of ​​the arch beam intersection along the longitudinal direction of the bridge. The longitudinal beam support 31 is used to connect with the arch rib 5.

[0044] exist Figures 1 to 4 The design also uses a spatial rectangular coordinate system to mark each direction, with the X-axis representing the longitudinal direction, the Y-axis representing the transverse direction, and the Z-axis representing the height direction. Since the bridge deck 6 will obstruct the truncated crossbeam 1, the ordinary crossbeam 2, and the transition longitudinal beam 3 below it, therefore... Figure 2 The bridge deck 6 was concealed to allow for a clear view of the truncated crossbeam 1, the ordinary crossbeam 2, and the transition longitudinal beam 3.

[0045] In an optional embodiment, the end of the transition longitudinal beam 3 passes through at least two ordinary crossbeams 2, and at least one of the ordinary crossbeams 2 through which the transition longitudinal beam 3 passes is a box girder; for example... Figures 2 to 4 As shown, the two ends of the transition longitudinal beam 3 pass through four ordinary crossbeams 2 respectively. One of the ordinary crossbeams 2 is a box beam, and the other crossbeams are I-beams.

[0046] In optional implementations, such as Figure 3 As shown, an arc transition 21 is provided at the connection between the ordinary crossbeam 2 and the edge beam 4.

[0047] In the above embodiments, the diameter of the arc transition 21 between the ordinary crossbeam 2 and the edge beam 4 of the box girder is larger than the diameter of the arc transition 21 between the other ordinary crossbeams 2 and the edge beam 4; for example, the diameter of the arc transition 21 between the ordinary crossbeam 2 and the lower flange of the edge beam 4 of the I-beam can be set to 200mm, while the diameter of the arc transition 21 between the ordinary crossbeam 2 and the lower flange of the edge beam 4 of the box girder can be set to 400mm. In an optional embodiment, the portion of the transition longitudinal beam 3 that extends beyond the ordinary transverse beam 2 is a variable-height section 32, and the cross-sectional height of the variable-height section 32 decreases along the direction away from the intersection area of ​​the arch beam; specifically, as shown... Figure 4 As shown, the top elevation of the variable elevation section 32 remains constant along the longitudinal direction of the bridge, but the bottom elevation of the variable elevation section 32 is higher as it moves further away from the arch-beam intersection area along the longitudinal direction of the bridge, thereby gradually reducing the cross-sectional height of the variable elevation section 32. The specific ways of reducing the height include, but are not limited to, linear reduction along the longitudinal direction, sinusoidal reduction, exponential reduction, logarithmic reduction, or step reduction.

[0048] In the above embodiment, the starting point of the variable height section 32 is located close to the box girder, for example... Figure 4 As shown, the cross-sectional height of the transition longitudinal beam 3 remains unchanged before passing through the box girder, and only begins to decrease after passing through the box girder, which helps to simplify the connection design between the box girder and the transition longitudinal beam 3.

[0049] In alternative implementations, for example Figure 2 and Figure 4 As shown, the longitudinal beam support 31 is located at the intersection of the transition longitudinal beam 3 and the cut-off crossbeam 1.

[0050] In an optional embodiment, the longitudinal beam support 31 is provided along the longitudinal direction of the bridge near the center of the arch beam intersection area.

[0051] In an optional embodiment, one or more of the transition longitudinal beam 3, the truncated transverse beam 1, and the ordinary transverse beam 2 are I-beams; for example, in Figure 4 In the structure shown, all five sectional crossbeams 1 are made of I-beams, and of the eight ordinary crossbeams 2, except for two which are box girders, the other six are made of I-beams; the transition longitudinal beams 3 are also made of I-beams.

[0052] In the above embodiment, the width of the upper flange of the end of the transition longitudinal beam 3 away from the arch-beam intersection area decreases in the direction away from the arch-beam intersection area; for example... Figure 3 As shown, the transition longitudinal beam 3 passes through Figure 3 After the second ordinary crossbeam 2 from bottom to top, the width of its upper flange gradually decreases along the transverse direction of the bridge, and... Figure 3 The length of the middle section decreases to zero before the first ordinary crossbeam 2 from bottom to top, meaning that only the web of the transition longitudinal beam 3 passes through the last ordinary crossbeam 2.

[0053] In the above embodiments, the transition longitudinal beam 3 is bolted to the ordinary crossbeam 2 and the cut-off crossbeam 1, and the web of the transition longitudinal beam 3 is welded to the web of the ordinary crossbeam 2 and the web of the cut-off crossbeam 1.

[0054] In an optional implementation, the side beam 4 is a box beam.

[0055] This embodiment also verifies the technical effect of the rigid tie rod of the swallow-shaped arch bridge in improving the force transmission path through finite element analysis: like Figure 5 As shown, a finite element model of the entire bridge was established using Midas software. The internal forces of each component were calculated using beam element models, and the dimensions and other parameters of the truncated crossbeam 1, ordinary crossbeam 2, and transition longitudinal beam 3 were initially determined. After the overall scheme stabilized, the following four sub-schemes were established and compared through finite element model calculations: A. Similar to existing technologies, the transition longitudinal beam 3 adopts a uniform height design and its end terminates at the ordinary crossbeam 2 (without passing through the ordinary crossbeam 2); the ordinary crossbeam 2 is made of I-beam.

[0056] B. Based on scheme A, change the two ordinary crossbeams 2 into box girders.

[0057] C. Based on scheme B, change the two ends of the transition longitudinal beam 3 to variable height sections 32.

[0058] D. Based on scheme C, extend the two ends of the transition longitudinal beam 3 through the ordinary crossbeams located at the two ends by 2680mm.

[0059] The finite element analysis results for schemes A, B, C, and D are as follows: Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the calculation results show that the maximum stress of scheme A is 193.4 MPa, the maximum stress of scheme B is 162.4 MPa, the maximum stress of scheme C is 160.9 MPa, and the maximum stress of scheme D is 150.4 MPa. This proves that this embodiment can significantly reduce the stress level of the bridge in the arch-beam intersection area.

[0060] like Figure 10 A local fine finite element model was established as shown. Based on the analysis of the full bridge finite element model, the boundary forces of the fine finite element model were obtained. The detailed stress distribution of the transition longitudinal beam 3, the truncated crossbeam 1, the ordinary crossbeam 2, the bridge deck 6, and the edge beam 4 was analyzed in detail. The structure and dimensions of the main components were further determined, and stress analysis was performed. The analysis results show that, except for the transition connection between the lower flange of the ordinary crossbeam 2 (which uses a box girder) and the edge beam 4, the stress levels of the other ordinary crossbeams 2 and truncated crossbeam 1 meet the specifications. The diameter of the arc transition 21 at the connection between the lower flange of the ordinary crossbeam 2 (which uses a box girder) and the edge beam 4 was increased, and the calculation was performed again. The calculation results are shown below. Figure 11 As shown, the stress level at the connection between the ordinary beam 2 and the edge beam 4 is significantly reduced, which meets the requirements of the specification.

[0061] Example 2 An arch bridge, specifically a thrustless, tie-bar-less, mid-span arch bridge, includes arch ribs 5 and bridge deck 6, with rigid tie rods (as described in Embodiment 1) used to improve force transmission paths between the arch ribs 5 and the bridge deck 6; Figures 1 to 4 As shown, four arch ribs 5 are provided on both sides of the bridge along the transverse direction, and the side beams 4 on both sides pass through the four arch ribs 5 on the corresponding sides along the longitudinal direction. An arch-beam intersection area is set at the intersection of the arch ribs 5 with the bridge deck 6 and the rigid tie rod of the flying swallow arch bridge that improves the force transmission path. The bridge deck 6 has an opening in the arch-beam intersection area. The rigid tie rod of the flying swallow arch bridge that improves the force transmission path does not set a normal crossbeam 2 in the arch-beam intersection area, but sets a truncated crossbeam 1, so that the arch ribs 5 can pass through the bridge deck 6 and the rigid tie rod of the flying swallow arch bridge that improves the force transmission path from the arch-beam intersection area, without interfering with the bridge deck 6 and the truncated crossbeam 1.

[0062] In an alternative embodiment, the bridge deck 6 may be an existing orthotropic bridge deck 6, such as a bridge deck 6 including a driving deck, U-ribs, plate ribs and small longitudinal beams.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rigid tie rod for a flying swallow arch bridge with improved force transmission path, comprising a truncated crossbeam (1), a common crossbeam (2), a transition longitudinal beam (3), and a side beam (4); at least two of the truncated crossbeams (1) are spaced apart along the longitudinal direction of the bridge at the intersection of the arch and the crossbeam, and at least two of the common crossbeams (2) are spaced apart along the longitudinal direction on both sides of the intersection of the arch and the crossbeam, with the side beams (4) respectively connected to both ends of the common crossbeams (2); the transition longitudinal beam (3) passes through each of the truncated crossbeams (1) along the longitudinal direction of the bridge, and the two ends of the transition longitudinal beam (3) are respectively connected to the common crossbeams (2) at the corresponding ends; characterized in that: The two ends of the transition longitudinal beam (3) pass through at least one corresponding end of the ordinary crossbeam (2) and extend in a direction away from the arch beam intersection area. The end of the transition longitudinal beam (3) that passes through the ordinary crossbeam (2) is used to connect with the longitudinal rib of the bridge deck (6). The bottom of the transition longitudinal beam (3) is provided with at least one longitudinal beam support (31), the longitudinal beam support (31) is located in the area of ​​the arch beam intersection along the longitudinal direction of the bridge, and the longitudinal beam support (31) is used to connect with the arch rib (5).

2. The rigid tie rod for an improved force transmission path in a swallow-shaped arch bridge according to claim 1, characterized in that, The end of the transition longitudinal beam (3) passes through at least two ordinary crossbeams (2), and at least one of the ordinary crossbeams (2) through which the transition longitudinal beam (3) passes is a box beam.

3. A rigid tie rod for a swallow-shaped arch bridge with improved force transmission path according to claim 2, characterized in that, A circular arc transition (21) is provided at the connection between the ordinary crossbeam (2) and the side beam (4).

4. A rigid tie rod for a swallow-shaped arch bridge with improved force transmission path according to claim 3, characterized in that, The diameter of the arc transition (21) between the ordinary crossbeam (2) and the side beam (4) of the box girder is larger than the diameter of the arc transition (21) between the other ordinary crossbeams (2) and the side beams (4).

5. A rigid tie rod for a swallow-shaped arch bridge with improved force transmission path according to claim 1, characterized in that, The portion of the transition longitudinal beam (3) that extends out of the ordinary cross beam (2) is a variable height section (32), and the cross-sectional height of the variable height section (32) decreases in the direction away from the intersection area of ​​the arch beam.

6. A rigid tie rod for improving the force transmission path of a swallow-shaped arch bridge according to any one of claims 1 to 5, characterized in that, The longitudinal beam support (31) is located at the intersection of the transition longitudinal beam (3) and the cut-off crossbeam (1).

7. A rigid tie rod for improving the force transmission path of a swallow-shaped arch bridge according to any one of claims 1 to 5, characterized in that, The longitudinal beam support (31) is set in the middle of the longitudinal direction of the bridge, close to the intersection of the arch beams.

8. A rigid tie rod for improving the force transmission path of a swallow-shaped arch bridge according to any one of claims 1 to 5, characterized in that, One or more of the transition longitudinal beam (3), the truncated crossbeam (1), and the ordinary crossbeam (2) are made of I-beams.

9. A rigid tie rod for a swallow-shaped arch bridge with improved force transmission path according to claim 8, characterized in that, The width of the upper flange of the end of the transition longitudinal beam (3) away from the arch beam intersection area decreases in the direction away from the arch beam intersection area.

10. An arch bridge, comprising an arch rib (5) and a bridge deck (6), characterized in that, It also includes a rigid tie rod for a flying swallow arch bridge as described in any one of claims 1 to 9, which improves the force transmission path.

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