Large-span half-through triple-arch bridge structure

Abstract

The invention discloses a large-span half-through three-continuous arch bridge structure, and belongs to the technical field of bridge engineering. The triple arch bridge structure comprises a main beam and two arch ribs. The main beam comprises a first beam body, a second beam body and at least two tie bars, each arch rib comprises a main arch, two secondary arches and two side arches, one end of the main arch and one end of the corresponding secondary arch are fixedly connected with one end of the corresponding first beam body or one end of the second beam body, and a middle pier arch beam triangular structure is defined by the main beam and the two side arches; the other end of each secondary arch and the top of the corresponding side arch are fixedly connected with the other end of the corresponding first beam body or the other end of the corresponding second beam body, and the first beam body and the second beam body are connected through a bracket structure or a drawer beam. According to the large-span half-through type three-connection arch bridge structure, the temperature force of the midspan main beam can be effectively released, the stress condition of the structure is improved, a stable rigid frame structure is locally formed, and the overall rigidity and bearing capacity of a structural system are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a large-span half-through triple-arch bridge structure. Background Art

[0002] Arch bridges have the characteristics of large span, high load-bearing capacity, and good landscape effects, and they occupy an important position in bridge engineering. The mid-span arch bridge structure has good line adaptability, can effectively reduce the height of the structure, improve the longitudinal line shape of the approach bridges on both sides, reduce the construction scale of the approach bridges, and has beautiful shape and visual appearance, so it is increasingly favored by bridge designers.

[0003] At present, the three-arch bridges in the middle basically adopt the full rigid structure system with arch-beam fixed connection or the continuous support system with arch-beam separation. The full rigid structure system with arch-beam fixed connection has large overall structural rigidity and high stability, and is generally suitable for small and medium span arch bridges. For large span arch bridges, the temperature additional force of the full fixed structure is large, and the arch foot and foundation often cannot meet the design requirements. The structural resistance is improved by adopting a larger scale and more complex structural form, which will undoubtedly increase the project construction cost. If the long span three-arch bridge in the middle adopts the continuous support system with arch-beam separation, the main beam is supported on the arch rib cross beam, and the main beam floats longitudinally. After the bridge is completed, the temperature secondary internal force is small, but the overall structural rigidity is poor and the stability is low. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a large-span mid-span triple-arch bridge structure, the purpose of which is: on the one hand, it can effectively release the temperature force of the main beam corresponding to the beam-arch structure (main span) between the middle piers, thereby improving the stress on the arch foot and foundation; on the other hand, it retains some constraints of the full rigid frame system, thereby improving the overall stiffness and stability of the structure.

[0005] To achieve the above object, the present invention provides a large-span half-through triple-arch bridge structure, the triple-arch bridge structure comprising a main beam and two arch ribs, the two arch ribs are located on both sides of the main beam, and each arch rib corresponds to two middle piers and two side piers;

[0006] The main beam includes a first beam body, a second beam body and at least two tie rods arranged coaxially, each of the arch ribs includes a main arch, two secondary arches and two side arches, the two secondary arches and the two side arches are symmetrically arranged along the central axis of the main arch, and the tops of the two corresponding main arches and the two corresponding secondary arches are fixedly connected by a cross brace, the two middle piers are located between the two side piers, the two end portions of the main arch are respectively fixed to the corresponding middle piers with one end portion of the corresponding secondary arch, one end of the main arch and one end of the corresponding secondary arch are fixed to one end of the corresponding first beam body or one end of the second beam body, and are respectively surrounded to form a middle A pier-arch-beam triangular structure, the other end of each secondary arch and the bottom of the corresponding side arch are fixed on the corresponding side pier, the other end of each secondary arch and the corresponding side arch are fixed to the other end of the corresponding first beam body or the other end of the second beam body, and are respectively surrounded to form a side pier-arch-beam triangular structure, one end face of the first beam body and one end face of the second beam body are spaced apart, and the first beam body and the second beam body are connected by a corbel structure or a drawer beam, the two ends of the two tie rods are respectively inserted into the first beam body and the second beam body, and the two ends of each tie rod are respectively anchored to the two ends of the corresponding main arch.

[0007] Optionally, the first beam body and the second beam body are steel-concrete composite beams or steel beams.

[0008] Optionally, side box longitudinal beams are provided on both sides of the steel-concrete composite beam and the steel beam.

[0009] Optionally, the main arch and one of the secondary arches are connected to the first beam body via a plurality of suspension rods arranged at intervals, and the other secondary arch is connected to the second beam body via a plurality of suspension rods arranged at intervals.

[0010] Optionally, the spacing space corresponding to the end surface of one end of the first beam body and the end surface of one end of the second beam body is located between the adjacent ends of the hanger rod and the second beam body and the consolidation point of one end of the main arch.

[0011] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0012] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0013] For a large-span mid-through triple-arch bridge structure provided by an embodiment of the present invention, the two ends of the main arch are respectively fixed to the corresponding middle pier with one end of the corresponding secondary arch, one end of the main arch and one end of the corresponding secondary arch are both fixed to one end of the corresponding first beam or one end of the second beam, and are respectively surrounded to form a middle pier arch-beam triangular structure, thereby realizing the consolidation of the first beam (or second beam), the main arch and the secondary arch on each middle pier. In addition, the other end of each secondary arch and the bottom of the corresponding side arch are both fixed to the corresponding side pier, the other end of each secondary arch and the corresponding side arch are both fixed to the other end of the corresponding first beam or the other end of the second beam, and are respectively surrounded to form a side pier arch-beam triangular structure, thereby realizing the consolidation of the first beam (or second beam), the secondary arch and the side arch on each side pier, thereby retaining some constraints of the full rigid frame system, effectively improving the overall rigidity, and forming a stable rigid frame structure with a greater structural redundancy in the triangular area and the side arch and the main beam part, thereby improving the stability and ultimate bearing capacity of the structure.

[0014] Furthermore, one end face of the first beam body is spaced from one end face of the second beam body, and the first beam body and the second beam body are connected by a corbel structure or a drawer beam, so that the main beam is set as two axially spaced (axially non-interactive) first beam bodies and second beam bodies, and the spacing position corresponds to the main arch, so that the main beam corresponding to the main arch is set into two axially spaced sections, which can effectively release the temperature force of the main beam corresponding to the beam-arch structure between the middle piers. In addition, the two ends of the two tie rods are respectively inserted into the first beam body and the second beam body, and the two ends of each tie rod are respectively anchored on the two ends of the corresponding main arch. The two ends of the main arch can be reliably connected through the tie rod, thereby reducing the horizontal force of the main arch on the middle pier, without the need to adopt a larger scale and more complex structural form to improve the structural resistance, thereby reducing the construction cost.

[0015] That is to say, the large-span mid-span triple-arch bridge structure provided by the embodiment of the present invention can effectively release the temperature force of the mid-span main beam, improve the stress condition of the structure, locally form a stable rigid frame structure, and significantly improve the overall stiffness and bearing capacity of the structural system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a large-span half-through triple-arch bridge structure provided by an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 AA section view;

[0018] Figure 3 yes Figure 1 BB section view;

[0019] Figure 4 yes Figure 1 CC section view;

[0020] Figure 5 It is a force diagram of a large-span half-through triple-arch bridge structure provided by an embodiment of the present invention;

[0021] Figure 6 yes Figure 1 A partial enlarged view of the middle D area;

[0022] Figure 7 It is a force diagram of another large-span half-through triple-arch bridge structure provided by an embodiment of the present invention.

[0023] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0024] 1. Main beam; 11. First beam body; 12. Second beam body; 121. Corbel; 13. Tie rod; 2. Arch rib; 21. Main arch; 22. Secondary arch; 23. Side arch; 3. Middle pier; 4. Side pier; 5. Cross brace; 6. Middle pier arch-beam triangular structure; 7. Side pier arch-beam triangular structure; 8. Suspension rod. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] Example:

[0031] Figure 1 is a structural schematic diagram of a large-span half-through triple-arch bridge structure provided by an embodiment of the present invention, Figure 2 yes Figure 1 AA section view, combined with Figure 1 and Figure 2 As shown, the triple arch bridge structure includes a main beam 1 and two arch ribs 2. The two arch ribs 2 are located on both sides of the main beam 1. Each arch rib 2 corresponds to two middle piers 3 and two side piers 4.

[0032] The main beam 1 includes a first beam body 11, a second beam body 12 and at least two tie rods 13 arranged coaxially, each arch rib 2 includes a main arch 21, two secondary arches 22 and two side arches 23, the two secondary arches 22 and the two side arches 23 are symmetrically arranged along the central axis of the main arch 21, and the tops of the corresponding two main arches 21 and the corresponding two secondary arches 22 are fixedly connected by a cross brace 5, the two middle piers 3 are located between the two side piers 4, the two end portions of the main arch 21 are respectively fixed to the corresponding middle pier 3 with one end portion of the corresponding secondary arch 22, one end of the main arch 21 and one end of the corresponding secondary arch 22 are both fixed to one end of the corresponding first beam body 11 or one end of the second beam body 12, and are respectively surrounded to form a The middle pier arch beam triangular structure 6, the other end of each secondary arch 22 and the bottom of the corresponding side arch 23 are fixed on the corresponding side pier 4, the other end of each secondary arch 22 and the corresponding side arch 23 are fixed to the other end of the corresponding first beam body 11 or the other end of the second beam body 12, and are respectively surrounded to form a side pier arch beam triangular structure 7, one end face of the first beam body 11 and one end face of the second beam body 12 are spaced, and the first beam body 11 and the second beam body 12 are connected by a corbel structure or a drawer beam, the two ends of the two tie rods 13 are respectively inserted into the first beam body 11 and the second beam body 12, and the two ends of each tie rod 13 are respectively anchored on the two ends of the corresponding main arch 21 (see Figure 3 and Figure 4 ).

[0033] For a large-span mid-through triple-arch bridge structure provided in an embodiment of the present invention, both end portions of the main arch 21 and one end portion of the corresponding secondary arch 22 are fixed on the corresponding middle pier 3, one end of the main arch 21 and one end of the corresponding secondary arch 22 are both fixed to one end of the corresponding first beam 11 or one end of the second beam 12, and are respectively surrounded to form a middle pier arch-beam triangular structure 6, thereby realizing the consolidation of the first beam 11 (or the second beam 12), the main arch 21 and the secondary arch 22 on each middle pier 3. In addition, the other end of each secondary arch 22 and the bottom of the corresponding side arch 23 are fixed on the corresponding side pier 4, and the other end of each secondary arch 22 and the corresponding side arch 23 are consolidated with the other end of the corresponding first beam 11 or the other end of the second beam 12, and are respectively surrounded to form a side pier-arch-beam triangular structure 7, thereby realizing the consolidation of the first beam 11 (or the second beam 12), the secondary arch 22 and the side arch 23 on each side pier 4, thereby retaining some constraints of the full rigid frame system, and the overall rigidity is effectively improved. The triangular area and the side arch form a stable rigid frame system with the main beam part, which has greater structural redundancy and improves the stability and ultimate bearing capacity of the structure.

[0034] Furthermore, the end face of one end of the first beam body 11 and the end face of one end of the second beam body 12 are spaced apart, and the first beam body and the second beam body are connected by a corbel structure or a drawer beam, so that the main beam 1 is set as two axially spaced (axially non-interactive) first beam bodies 11 and second beam bodies 12, and the spacing position corresponds to the main arch 21, so that the main beam 1 corresponding to the main arch 21 is set into two axially spaced sections, which can effectively release the temperature force of the main beam 1 corresponding to the beam-arch structure between the middle piers. In addition, the two ends of the two tie rods 13 are respectively inserted in the first beam body 11 and the second beam body 12, and the two ends of each tie rod 13 are respectively anchored on the two ends of the corresponding main arch 21. The two ends of the main arch 21 can be reliably connected through the tie rod 13, thereby reducing the horizontal force of the main arch 21 on the middle pier 3, without the need to adopt a larger scale and more complex structural form to improve the structural resistance, thereby reducing the construction cost.

[0035] That is to say, the large-span mid-span triple-arch bridge structure provided by the embodiment of the present invention can effectively release the temperature force of the mid-span main beam, improve the stress condition of the structure, locally form a stable rigid frame structure, and significantly improve the overall stiffness and bearing capacity of the structural system.

[0036] It should be noted that the number of the cross braces 5 can be adjusted according to the stability and bearing capacity requirements of the arch rib 2.

[0037] It is easy to understand that the present invention connects the arch ribs and the main beams by fixed connection, and a corbel or drawer beam is arranged near the main arch-beam connection to disconnect the main beam. The main beam corresponding to the middle span can be equivalent to a multi-point elastic support beam with one end fixed to the arch-beam node and the other end of the main beam corresponding to the middle span being longitudinally movable. The main beam can transmit shear force or bending moment but not axial force at the interval position (i.e., the break), so as to reduce the huge additional internal force of the structure caused by temperature effect, and a tie rod is arranged in the middle span to adjust the horizontal thrust of the arch foot, which can effectively improve the stress on the arch foot and the foundation. At the same time, the structure retains some constraints of the full rigid frame system, which significantly improves the stability and ultimate bearing capacity of the structure.

[0038] Figure 5 is a force diagram of a large-span half-through triple-arch bridge structure provided by an embodiment of the present invention, Figure 6 yes Figure 1 A partial enlarged view of the D area in the middle, combined with Figure 5 and Figure 6 As shown, a corbel 121 is provided on one end surface of the second beam body 12 , and one end of the first beam body 11 is placed on the corbel 121 .

[0039] It is easy to understand that the corbel 121 can not only support the first beam body 11, but also maintain the interval between the first beam body 11 and the second beam body 12 in the axial direction. In addition, the vertical shear force between the first beam body 11 and the second beam body 12 can be transmitted through the corbel 121. At this time, there is no axial force between the first beam body 11 and the second beam body 12, so that the temperature force of the main beam 1 corresponding to the beam arch structure between the middle piers can be effectively released.

[0040] Exemplarily, one end surface of the first beam body 11 has a protrusion, and the protrusion rests on the corbel 121 , so that the surface of the first beam body 11 and the upper surface of the second beam body 12 are coplanar.

[0041] Furthermore, a support is provided on the corbel 121, and one end of the first beam body 11 is placed on the support. The support can support the first beam body 11, ensuring that the first beam body 11 can slide and rotate relative to the second beam body 12.

[0042] It should be noted that, in other embodiments of the present invention, the corbel 121 may also be disposed on the first beam body 11 .

[0043] Figure 7 FIG. 1 is a force diagram of another large-span half-through triple-arch bridge structure provided by an embodiment of the present invention. Figure 7 As shown, the first beam body 11 and the second beam body 12 are connected by the drawer beam, that is, the first beam body 11 and the second beam body 12 are inserted and matched by the drawer beam (specifically: there are rollers between the first beam body and the second beam body and the drawer beam, and the two ends of the drawer beam are respectively inserted in the first beam body and the second beam body, and can slide relatively, which is not shown in the figure, and the drawer beam is also arranged Figure 1 middle D area).

[0044] It is easy to understand that the insertion and fitting between the first beam body 11 and the second beam body 12 can not only support the first beam body 11, but also maintain the interval between the first beam body 11 and the second beam body 12 in the axial direction. In addition, the vertical shear force and bending moment between the first beam body 11 and the second beam body 12 can be transmitted through the drawer beam. At this time, there is no axial force between the first beam body 11 and the second beam body 12, so that the temperature force of the main beam 1 corresponding to the beam arch structure between the middle piers can also be effectively released.

[0045] Continue to see Figure 1 The main arch 21 and one secondary arch 22 are connected to the first beam body 11 through a plurality of spaced-apart suspension rods 8, and the other secondary arch 22 is connected to the second beam body 12 through a plurality of spaced-apart suspension rods 8. The suspension rods 8 can increase the connection strength between the main arch 21 or the secondary arch 22 and the beam body, and provide multi-point elastic support for the first beam body 11 and the second beam body 12.

[0046] In one implementation of the present invention, the spacing space corresponding to one end face of the first beam body 11 and one end face of the second beam body 12 is located at the consolidation point between one end of the adjacent hanger rod 8 and one end of the second beam body 12 and one end of the main arch 21 ( Figure 4 The position corresponding to the middle C area).

[0047] It is easy to understand that the spacing space corresponding to the end face of one end of the first beam body 11 and the end face of one end of the second beam body 12 is located between the adjacent hanger 8 and the consolidation point of the second beam body 12 and one end of another secondary arch 22, so that the spacing is close to the middle pier arch beam triangular structure 6, which can also minimize the impact of the spacing between the first beam body 11 and the second beam body 12 on the structural strength reduction of the entire three-arch bridge structure.

[0048] In this embodiment, the first beam body 11 and the second beam body 12 are steel-concrete composite beams or steel beams. In addition, in order to facilitate the consolidation of the beam body and the main arch 21 or the secondary arch 22, both sides of the steel-concrete composite beam and the steel beam are side box longitudinal beams.

[0049] Specifically, if a composite beam is adopted, the main beam 1 in the suspension area (i.e. the main beam 1 corresponding to the hanger 8) is a composite beam of "double-sided box longitudinal beam + dense cross beam + concrete slab", and the main beam 1 corresponding to the middle pier arch beam triangular structure 6 or the side pier arch beam triangular structure 7 is a composite beam of "closed steel box beam + concrete slab"; if a steel box beam is adopted, the main beam 1 in the suspension area (i.e. the main beam 1 corresponding to the hanger 8) is an open steel box beam of "double-sided box longitudinal beam + dense cross beam + orthogonal anisotropic steel bridge deck", and the main beam 1 corresponding to the middle pier arch beam triangular structure 6 or the side pier arch beam triangular structure 7 is a closed steel box beam of "orthogonal anisotropic steel bridge deck".

[0050] It will be easily understood by those skilled in the art that 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 in the protection scope of the present invention.

Claims

1. A long-span half-through triple-arch bridge structure, characterized in that: The triple-arch bridge structure comprises a main beam (1) and two arch ribs (2), wherein the two arch ribs (2) are located on both sides of the main beam (1), and each arch rib (2) corresponds to two middle piers (3) and two side piers (4); The main beam (1) comprises a first beam body (11), a second beam body (12) and at least two tie rods (13) which are coaxially arranged; each of the arch ribs (2) comprises a main arch (21), two secondary arches (22) and two side arches (23); the two secondary arches (22) and the two side arches (23) are symmetrically arranged along the central axis of the main arch (21); the tops of the two corresponding main arches (21) and the two corresponding secondary arches (22) are fixedly connected by a cross brace (5); the two middle piers (3) are located between the two side piers (4); the two end portions of the main arch (21) and one end portion of the corresponding secondary arch (22) are respectively fixed to the corresponding middle pier (3); one end of the main arch (21) and one end of the corresponding secondary arch (22) are fixed to one end of the corresponding first beam body (11) or one end of the second beam body (12); and A middle pier arch beam triangular structure (6) is respectively formed by enclosing, the other end of each secondary arch (22) and the bottom of the corresponding side arch (23) are fixed on the corresponding side pier (4), the other end of each secondary arch (22) and the corresponding side arch (23) are fixed to the other end of the corresponding first beam body (11) or the other end of the second beam body (12), and a side pier arch beam triangular structure (7) is respectively formed by enclosing, one end face of the first beam body (11) and one end face of the second beam body (12) are spaced, and the first beam body (11) and the second beam body (12) are connected by a corbel structure or a drawer beam, the two ends of the two tie rods (13) are respectively inserted into the first beam body (11) and the second beam body (12), and the two ends of each tie rod (13) are respectively anchored to the two ends of the corresponding main arch (21).

2. A long-span half-through triple-arch bridge structure according to claim 1, characterized in that: The first beam body (11) and the second beam body (12) are steel-concrete composite beams or steel beams.

3. A long-span half-through triple-arch bridge structure according to claim 2, characterized in that: Both side edges of the steel-concrete composite beam and the steel beam are side box longitudinal beams.

4. The large-span half-through triple-arch bridge structure according to claim 1, characterized in that: The main arch (21) and one of the secondary arches (22) are connected to the first beam body (11) via a plurality of suspension rods (8) arranged at intervals, and the other secondary arch (22) is connected to the second beam body (12) via a plurality of suspension rods (8) arranged at intervals.

5. The large-span half-through triple-arch bridge structure according to claim 4, characterized in that: The spacing space corresponding to the end surface of one end of the first beam body (11) and the end surface of one end of the second beam body (12) is located between the adjacent ends of the suspension rod (8) and the second beam body (12) and the consolidation point with one end of the main arch (21).

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