Flying swallow type arch bridge rigid tie bar for improving force transmission path

Abstract

The invention relates to the technical field of bridges, in particular to a flying swallow type arch bridge rigid tie bar for improving a force transmission path, which comprises a cut-off cross beam, a common cross beam, a transition longitudinal beam and a boundary beam, the transition longitudinal beams penetrate through the cut-off cross beams in the longitudinal bridge direction. The two ends of each transition longitudinal beam are connected with edge beams respectively, penetrate through the common cross beams at the corresponding ends respectively and extend in the direction away from the arched beam intersection area, and the ends, penetrating out of the common cross beams, of the transition longitudinal beams are used for being connected with longitudinal ribs of a bridge deck slab. At least one longitudinal beam support is arranged at the bottom of the transition longitudinal beam, the position of the longitudinal beam support in the longitudinal bridge direction is located within the range of the arched beam intersection area, and the longitudinal beam support is used for being connected with an arch rib. The technical problem that driving smoothness and safety are reduced due to the fact that a rigid tie bar of an existing arch bridge is unreasonable in force transmission path in an arched girder crossing area, insufficient in local rigidity and overlarge in stress can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a rigid tie rod of a swallow-type arch bridge with an improved force transmission path. Background Art

[0002] The existing thrust-free and tie-rod-free mid-through arch bridge relies on the side beams as tie beams to provide the function of offsetting the thrust of the arch bottom. The main beam structure itself is equivalent to the tie rod of the arch bridge, so it is also called a steel tie rod or a rigid tie rod. In order to ensure that the tie beam is not eccentric when balancing the thrust of the arch rib, it is necessary to make the side beams of the rigid tie rod coincide with the center line of the corresponding side arch rib. Therefore, the designers will set an arch beam intersection area on the rigid tie rod and let the arch rib pass directly through the arch beam intersection area. In order to avoid interference between the arch rib and the bridge deck and the cross beams in the rigid tie rod, the bridge deck is connected to the arch rib by the cross beams. The corresponding part of the beam intersection area needs to be opened, and the part where the cross beam connects to the side beam in the arch-beam intersection area also needs to be cut off. In order to maintain the longitudinal connection between the cut cross beam and other uncut ordinary cross beams, a transition longitudinal beam is also provided in the arch-beam intersection area. The transition longitudinal beam passes through each cut cross beam along the longitudinal bridge direction and its two ends are connected to the two ordinary cross beams closest to the arch rib intersection area. In this way, the load on the cut cross beam can be transferred to the ordinary cross beam through the transition beam, and then to the side beam through the ordinary cross beam. However, this structure will lead to the following problems: (1) The force on the end ordinary crossbeam connected to the transition longitudinal beam will be much greater than that on the other ordinary crossbeams not connected to the transition longitudinal beam, making the design of the ordinary crossbeam more difficult.

[0003] (2) In the existing technology, the ordinary cross beams that intersect the transition longitudinal beams are all I-shaped cross sections, and their out-of-plane torsional stiffness is relatively small. It is difficult to ensure the stiffness of the bridge deck in the intersection area of the transition longitudinal beam and the ordinary cross beam, which will cause the driving smoothness in the arch-beam intersection area to decrease.

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

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

[0006] In order to solve the above problems, it is necessary to propose a new type of rigid tie rod structure suitable for thrust-free and tie-rod-free half-through arch bridges. Summary of the Invention

[0007] The purpose of the present invention is to overcome the technical problems of the existing arch bridge's rigid tie rods in the arch-beam intersection area, such as unreasonable force transmission path, insufficient local stiffness and excessive stress, which lead to reduced driving smoothness and safety, and to provide a swallow-type arch bridge rigid tie rod with an improved force transmission path.

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

[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 the action of bridge deck load: (1) This scheme has a clear and definite force transmission path in the arch-beam intersection area: the bridge deck and train loads are first transmitted to the truncated crossbeam through the bridge deck, and the truncated crossbeam then transmits the load to the transition longitudinal beam along the transverse direction of the bridge. 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 crossbeams then transmit the load to the side beams in the form of shear force and torque.

[0010] (2) By arranging 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 greatly reduced (for example, if a longitudinal beam support is arranged in the middle of the transition longitudinal beam, the span of the transition longitudinal beam can be halved). This can not only greatly 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 ends of the transition longitudinal beams pass through the ordinary cross beams and are connected to the longitudinal reinforcement of the bridge deck. This can provide sufficient torsional strength for locations where the stiffness of the bridge deck varies greatly, thereby preventing the bridge deck from being subjected to excessive out-of-plane forces. This can not only further improve the safety of the bridge structure, but also improve the smoothness and safety of vehicles traveling in the arch-beam intersection area.

[0012] Preferably, an end portion of the transition longitudinal beam passes through at least two common cross beams, and at least one of the common cross beams passed through by the transition longitudinal beam is a box beam.

[0013] This solution 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 solution in which all ordinary crossbeams are made of I-beams, the higher strength and stiffness of the box beams are also conducive to reducing the number of ordinary crossbeams, thereby simplifying the connection design between ordinary crossbeams and transition longitudinal beams.

[0014] Preferably, an arc transition is provided at the connection between the common cross beam and the side beam.

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

[0016] Preferably, the arc transition diameter between the common cross beam and the side beam of the box beam is larger than the arc transition diameter between the other common cross beams and the side beams.

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

[0018] Preferably, the portion of the transition longitudinal beam passing through the ordinary cross beam is a heightened section, and the cross-sectional height of the heightened section decreases in a direction away from the arch-beam intersection area.

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

[0020] Preferably, the longitudinal beam support is arranged at the intersection area of the transition longitudinal beam and the truncated cross beam.

[0021] This solution sets the longitudinal beam support in the intersection area, so that the longitudinal beam support can more directly bear and transmit the vertical load of the transition longitudinal beam and the truncated crossbeam, thereby making the force transmission path shorter and clearer; at the same time, the stiffness of the intersection area of the transition longitudinal beam and the truncated crossbeam is relatively large, and setting the longitudinal beam support here is also beneficial to improving the stability of the structure.

[0022] Preferably, the longitudinal beam support is arranged along the longitudinal bridge direction near the middle of the arch-beam intersection area.

[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 close to the middle of the arch-beam intersection area along the longitudinal direction of the bridge. This can more effectively reduce the bending moment of the transition longitudinal beam, thereby improving the safety and bearing capacity of the structure.

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

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

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

[0027] In a second aspect, the present invention provides an arch bridge comprising arch ribs and a bridge deck, and also comprising a rigid tie rod of a swallow-type arch bridge for improving a force transmission path according to the present invention.

[0028] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a rigid tie rod for a flying swallow-type arch bridge with an improved force transmission path. By arranging a longitudinal beam support at the bottom of the transition longitudinal beam and allowing the two ends of the transition longitudinal beam to pass through the side of the ordinary cross beam, the bridge has a clear and definite force transmission path in the arch-beam intersection area, which can greatly 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 rigid tie rod of the flying swallow-type arch bridge with improved force transmission path of the present invention can further set the two ends of the transition longitudinal beam as variable height sections, thereby realizing a uniform transition of the bridge deck stiffness along the longitudinal direction of the bridge, and improving the smoothness and safety of vehicles driving in the arch-beam intersection area.

[0030] 3. The present invention provides an arch bridge that adopts the swallow-type arch bridge rigid tie rod of the present invention to improve the force transmission path, which can greatly 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the top view of the rigid tie rod of a flying swallow arch bridge with improved force transmission path according to the present invention Figure 1 ; Figure 2 This is a schematic diagram of the top view of the rigid tie rod of a flying swallow arch bridge with improved force transmission path according to the present invention. Figure 2 ; Figure 3 It is a partially enlarged top view of the rigid tie rod of a flying swallow-type arch bridge with improved force transmission path according to the present invention; Figure 4 This is a side structural diagram of a rigid tie rod of a swallow-type arch bridge with improved force transmission path according to the present invention; Figure 5 is a schematic diagram of the full-bridge finite element model in Example 1; Figure 6 The calculation results of the full-bridge finite element model in Example 1 are shown as follows: Figure 1 ; Figure 7 The calculation results of the full-bridge finite element model in Example 1 are shown as follows: Figure 2 ; Figure 8 The calculation results of the full-bridge finite element model in Example 1 are shown as follows: Figure 3 ; Figure 9The calculation results of the full-bridge finite element model in Example 1 are shown as follows: Figure 4 ; Figure 10 is a schematic diagram of a local refined finite element model in Example 1; Figure 11 is a schematic diagram of the calculation results of the local fine finite element model in Example 1; icon: 1- truncated beam; 2- ordinary beam; 21- arc transition; 3-transition longitudinal beam; 31-longitudinal beam support; 32-height change section; 4-side beam; 5-arch rib; 6-bridge deck. DETAILED DESCRIPTION

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

[0033] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or positional relationship, such as "upper", "lower", "left", "right", "center", "inside", and "outside", are based on the expressions of the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the invented product / device / apparatus is placed when it is conventionally used. These terms of orientation or positional relationship are merely for the purpose of facilitating the description of the scheme of the present invention or simplifying the description of the specific embodiments to facilitate the rapid understanding of the scheme by technicians, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship, and therefore should not be understood as limiting the present invention.

[0034] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simply understood that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", and "parallel", and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the present invention.

[0035] In addition, the expressions “first”, “second”, “third”, etc. in the terms are merely used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0036] In addition, in the description of the embodiments of the present invention, "several," "plurality," and "a number" represent at least two. It can also be any number such as two, three, four, five, six, seven, eight, nine, or even more than nine.

[0037] Furthermore, in the description of the technical solution of the present invention, unless otherwise expressly specified, defined, or limited, the terms "disposed," "installed," "connected," "connected," "provided with," "laid," and "arranged" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be welded, riveted, bolted, threaded, or other commonly used connection methods in the art. Such connections may be mechanical, electrical, or communicative; they may be direct, indirect via an intermediate medium, or internally connected between two components.

[0038] Example 1 like Figures 1 to 4 As shown, a rigid tie rod of a swallow-type arch bridge for improving the force transmission path includes a truncated crossbeam 1, a common 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 two side beams 4 are spaced apart along the transverse direction of the bridge.

[0040] The length of the truncated cross beam 1 is continuously set along the transverse direction of the bridge, so that its force transmission is more uniform and reasonable; multiple truncated cross beams 1 are distributed at intervals in the arch-beam intersection area along the longitudinal direction of the bridge, and their two ends are truncated 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 its force transmission is more uniform and reasonable; multiple ordinary crossbeams 2 are distributed at intervals on both sides of the arch-beam intersection area along the longitudinal direction of the bridge. Compared with the truncated crossbeam 1, the two ends of the ordinary crossbeam 2 are not truncated, but are respectively connected to the side beams 4 at the corresponding ends.

[0042] The length of the transition longitudinal beam 3 is set along the longitudinal bridge direction. The transition longitudinal beam 3 passes through each truncated cross beam 1 along the longitudinal bridge direction, and its two ends respectively pass through at least one common cross beam 2 at the corresponding end, and extend in the direction away from the arch beam intersection area, for example Figures 2 to 4 As shown, the two ends of the transition longitudinal beam 3 pass through four ordinary cross beams 2 respectively, and the transition longitudinal beam 3 passes through the end of the ordinary cross beam 2 and continues to extend a distance away from the arch beam intersection area. The end of the transition longitudinal beam 3 passes through the ordinary cross beam 2 and is connected to the longitudinal ribs 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 within the arch-beam intersection region along the longitudinal bridge direction. The longitudinal beam support 31 is used to connect with the arch rib 5 .

[0044] exist Figures 1 to 4 In the figure, the spatial rectangular coordinate system is used to mark each direction, where the X axis represents the longitudinal direction of the bridge, the Y axis represents the transverse direction of the bridge, and the Z axis represents the height direction. Since the bridge deck 6 will block the truncated beam 1, ordinary beam 2 and transition beam 3 below it, Figure 2 The bridge deck 6 is hidden in the figure so that the truncated cross beam 1, the ordinary cross beam 2 and the transition longitudinal beam 3 can be clearly observed.

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

[0046] In an optional embodiment, if Figure 3 As shown, an arc transition 21 is provided at the connection between the ordinary cross beam 2 and the side beam 4 .

[0047] In the above embodiment, the diameter of the arc transition 21 between the ordinary cross beam 2 and the side beam 4 of the box beam is larger than the diameter of the arc transition 21 between the other ordinary cross beams 2 and the side beams 4; for example, the diameter of the arc transition 21 between the ordinary cross beam 2 and the lower flange of the side beam 4 of the I-beam can be set to 200 mm, while the diameter of the arc transition 21 between the ordinary cross beam 2 and the lower flange of the side beam 4 of the box beam can be set to 400 mm In an optional embodiment, the portion of the transition longitudinal beam 3 passing through the ordinary cross beam 2 is a heightened section 32, and the cross-sectional height of the heightened section 32 decreases in a direction away from the arch beam intersection area; specifically, as Figure 4 As shown, the top surface elevation of the height-changing section 32 remains unchanged along the longitudinal direction of the bridge, but the bottom surface elevation of the height-changing section 32 increases as it moves away from the arch-beam intersection area along the longitudinal direction of the bridge, thereby gradually reducing the cross-sectional height of the height-changing section 32; specific methods of reduction include but are not limited to linear reduction, sinusoidal reduction, exponential reduction, logarithmic reduction or step-by-step reduction along the longitudinal direction of the bridge.

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

[0049] In an optional embodiment, for example Figure 2 and Figure 4 As shown, the longitudinal beam support 31 is arranged at the intersection area of the transition longitudinal beam 3 and the truncation cross beam 1.

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

[0051] In an optional embodiment, one or more of the transition longitudinal beam 3, the truncated cross beam 1 and the ordinary cross beam 2 is an I-beam; for example, Figure 4 In the structure shown, the five truncated cross beams 1 are all made of I-beams, and except for two of the eight ordinary cross beams 2 which are box beams, the remaining six are all 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 region decreases in the direction away from the arch beam intersection region; for example Figure 3 As shown, the transition longitudinal beam 3 passes through Figure 3 After the second common cross beam 2 from bottom to top, the width of its upper flange along the transverse direction of the bridge gradually decreases, and Figure 3 From bottom to top, it decreases to zero before the first common crossbeam 2 , that is, only the web of the transition longitudinal beam 3 passes through the last common crossbeam 2 .

[0053] In the above embodiment, the transition longitudinal beam 3 is connected to the common cross beam 2 and the truncated cross beam 1 by bolts, and the web of the transition longitudinal beam 3 is welded to the web of the common cross beam 2 and the web of the truncated cross beam 1 .

[0054] In an optional embodiment, 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 for 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, and the internal forces of each component were calculated using a beam unit model. The dimensions and other parameters of the truncated crossbeam 1, ordinary crossbeam 2, and transition longitudinal beam 3 were preliminarily determined. After the overall scheme was stabilized, the following four sub-schemes were established and compared through finite element model calculations: A. Similar to the prior art, the transition longitudinal beam 3 is designed with equal height, and the end thereof ends at the ordinary cross beam 2 (does not pass through the ordinary cross beam 2); the ordinary cross beam 2 is an I-beam.

[0056] B. Based on Plan A, change the two ordinary beams 2 into box beams.

[0057] C. Based on solution B, the two ends of the transition longitudinal beam 3 are changed into height-changing sections 32.

[0058] D. Based on solution C, the two ends of the transition longitudinal beam 3 are passed through the ordinary cross beams at the two ends by 2680mm.

[0059] The finite element analysis results of 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. It can be proved that this embodiment can significantly reduce the stress level of the bridge in the arch-beam intersection area.

[0060] like Figure 10 As shown in the figure, a local fine finite element model is established. Based on the fine finite element model analysis of the full bridge, the boundary force of the fine finite element model is obtained. The detailed stress distribution of the transition longitudinal beam 3, the truncated cross beam 1, the ordinary cross beam 2, the bridge deck 6 and the edge beam 4 is analyzed in detail. The structure and size of the main components are further determined and the stress analysis is carried out. The analysis results show that, except for the transition connection between the lower flange of the ordinary cross beam 2 and the edge beam 4 using a box beam, the stress levels of the remaining ordinary cross beams 2 and the truncated cross beam 1 meet the requirements of the specification. The diameter of the arc transition 21 at the connection between the lower flange of the ordinary cross beam 2 using a box beam and the edge beam 4 is increased and the calculation is repeated. The calculation results are shown in the figure below. Figure 11 As shown, it can be seen that the stress level at the connection between the ordinary cross beam 2 and the edge beam 4 is significantly reduced, which can meet the requirements of the specification.

[0061] Example 2 An arch bridge, specifically a thrust-free, tie-rod-free, mid-through arch bridge, comprises an arch rib 5 and a bridge deck 6, wherein a rigid tie rod of a swallow-type arch bridge for improving a force transmission path according to embodiment 1 is arranged between the arch rib 5 and the bridge deck 6; Figures 1 to 4 As shown, four arch ribs 5 are respectively 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 provided at the intersection of the arch rib 5, the bridge deck 6 and the rigid tie rod of the flying swallow-type arch bridge for improving the force transmission path, and the bridge deck 6 has a hole in the arch-beam intersection area. The rigid tie rod of the flying swallow-type arch bridge for improving the force transmission path does not have an ordinary crossbeam 2 in the arch-beam intersection area, but a truncated crossbeam 1 is provided, so that the arch rib 5 can pass through the bridge deck 6 and the rigid tie rod of the flying swallow-type arch bridge for improving 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 optional embodiment, the bridge deck 6 may adopt an existing orthotropic bridge deck 6, for example, a bridge deck 6 including a running deck, U-ribs, plate ribs and small longitudinal beams.

[0063] The above contents are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection 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), an ordinary 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 an arch-beam intersection, at least two of the ordinary crossbeams (2) are spaced apart along the longitudinal direction of the bridge at both sides of the arch-beam intersection, and both ends of the ordinary crossbeams (2) are respectively connected to the side beams (4); the transition longitudinal beam (3) passes through each of the truncated crossbeams (1) along the longitudinal direction of the bridge, and both ends of the transition longitudinal beam (3) are respectively connected to the ordinary crossbeams (2) at the corresponding ends; characterized in that: The two ends of the transition longitudinal beam (3) respectively pass through at least one corresponding end of the common cross beam (2) and extend in a direction away from the arch beam intersection area, and the end of the transition longitudinal beam (3) passing through the common cross beam (2) is used to connect with the longitudinal ribs of the bridge deck (6); At least one longitudinal beam support (31) is provided at the bottom of the transition longitudinal beam (3), and the longitudinal beam support (31) is located within the range of the arch beam intersection area along the longitudinal bridge direction. The longitudinal beam support (31) is used to connect with the arch rib (5).

2. The rigid tie rod of a swallow-type arch bridge with improved force transmission path according to claim 1, characterized in that: The end of the transition longitudinal beam (3) passes through at least two common cross beams (2), and at least one of the common cross beams (2) passed through by the transition longitudinal beam (3) is a box beam.

3. The rigid tie rod of a swallow-type 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 common cross beam (2) and the side beam (4).

4. The rigid tie rod of a swallow-type arch bridge with improved force transmission path according to claim 3, characterized in that: The diameter of the circular arc transition (21) between the common cross beam (2) and the side beam (4) of the box beam is larger than the diameter of the circular arc transition (21) between the other common cross beams (2) and the side beams (4).

5. The rigid tie rod of a swallow-type arch bridge with improved force transmission path according to claim 1, characterized in that: The portion of the transition longitudinal beam (3) passing through the common cross beam (2) is a heightened section (32), and the cross-sectional height of the heightened section (32) decreases in a direction away from the arch-beam intersection area.

6. A rigid tie rod for a flying swallow arch bridge with improved force transmission path according to any one of claims 1 to 5, characterized in that: The longitudinal beam support (31) is arranged at the intersection area of the transition longitudinal beam (3) and the truncated cross beam (1).

7. A rigid tie rod for a flying swallow arch bridge with improved force transmission path according to any one of claims 1 to 5, characterized in that: The longitudinal beam support (31) is arranged along the longitudinal bridge in the middle of the arch-beam intersection area.

8. A rigid tie rod for a flying swallow arch bridge with improved force transmission path according to any one of claims 1 to 5, characterized in that: One or more of the transition longitudinal beam (3), the truncated cross beam (1) and the ordinary cross beam (2) is an I-beam.

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

10. An arch bridge comprising an arch rib (5) and a bridge deck (6), characterized in that: It also includes a rigid tie rod of a swallow-type arch bridge with an improved force transmission path as described in any one of claims 1 to 9.

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