Highway and railway flat bridge tower through the cantilever steel box girder cable-stayed bridge

Abstract

The invention relates to a steel box girder cable-stayed bridge with a cantilever arm passing through the towers of a road-rail flat bridge. The main girder comprises a plurality of main girder standard sections and at least one tower-penetrating transition section for passing through the towers. The number of the tower-penetrating transition sections is the same as that of the bridge towers and they are arranged in a one-to-one correspondence. The number of the main girder standard sections is the same as that of the bridge spans and they are arranged in a one-to-one correspondence. Each tower-penetrating transition section is connected to an adjacent main girder standard section through a main girder changing section. The main girder standard section adopts a cantilever arm steel box girder, which can improve the bending and torsional rigidity and wind resistance and windmill bridge performance of the main girder and reduce the steel consumption of the main girder. The tower-penetrating transition section adopts a separated steel box girder, and the main girder changing section adopts an integral steel box girder. The main girder changing section of the integral steel box girder structure realizes an organic and smooth connection between the tower-penetrating transition section and the main girder standard section, thereby solving the key technical problem that the cross-section of the traditional cantilever arm steel box girder cannot be applied to the plan of passing through the towers of a road-rail flat bridge.

Description

Technical Field

[0001] The invention belongs to the technical field of bridges, and in particular relates to a cantilever-arm steel box girder cable-stayed bridge with a highway-railway flat-floor bridge tower. Background Art

[0002] At present, in the highway-railway flat-deck cable-stayed bridge, the main beam passing through the bridge tower generally adopts integral steel box beam and separated steel box beam, which faces the following problems during application:

[0003] (1) Integral steel box girder cable-stayed bridges have problems such as large steel consumption in the main beam and poor economic efficiency;

[0004] (2) The separated steel box girder cable-stayed bridge has problems such as low torsional stiffness of the main beam, large amount of steel used, and poor economy. Summary of the invention

[0005] The invention relates to a cantilever-arm steel box girder cable-stayed bridge with a highway-railway flat-level bridge tower, which can at least solve some defects of the prior art.

[0006] The present invention relates to a steel box girder cable-stayed bridge with cantilevered arm passing through the horizontal bridge towers of highway and railway, comprising at least one bridge tower and a main girder passing through the horizontal bridge towers of highway and railway, wherein the main girder passing through the horizontal bridge towers of highway and railway comprises a plurality of main girder standard sections and at least one bridge tower passing through transition section for passing through the bridge towers, the number of the bridge tower passing through transition sections is the same as that of the bridge towers and they are arranged in a one-to-one correspondence, and the number of the main girder standard sections is the same as that of the bridge spans and they are arranged in a one-to-one correspondence; each of the bridge tower passing through transition sections is connected to an adjacent main girder standard section through a main girder variation section, wherein the main girder standard section adopts a cantilevered steel box girder, the bridge tower passing through transition section adopts a separated steel box girder, and the main girder variation section adopts an integral steel box girder.

[0007] As one of the embodiments, the transition section in the bridge tower includes a middle box beam body for being respectively connected to the two side tower limbs of the bridge tower and two sets of side box beam bodies for being respectively installed on the outside of the corresponding side tower limbs, and the side box beam bodies are consistent with the cantilever shape of the standard section of the main beam.

[0008] As one of the implementation modes, the bridge tower includes a tower column and a supporting foundation, and the tower column is a shuttle-shaped structure that is wide in the middle and gradually narrows upwards and downwards.

[0009] As one of the implementation modes, both tower limbs of the tower column have vertical limb segments with limb surfaces parallel to the vertical direction, and the transition section passing through the bridge tower is respectively connected to the vertical limb segments on both sides.

[0010] As one of the implementation modes, a lower cross beam is provided at the lower part of the tower column, and the two ends of the lower cross beam are respectively connected to the two tower limbs of the tower column; the transition section passing through the bridge tower includes a middle box beam body and two groups of side box beam bodies respectively installed on the outer sides of the tower limbs on the corresponding sides, and the middle box beam body is supported on the lower cross beam and is laterally connected to the two tower limbs respectively.

[0011] As one of the implementation modes, the outer edges of the two tower limbs are provided with corbels, and each set of side box beams is supported on the corbels on the corresponding side and is laterally connected to the tower limb on the corresponding side.

[0012] As one of the implementation modes, an upper cross beam is provided on the upper portion of the tower column, and two ends of the upper cross beam are respectively connected to two tower limbs of the tower column.

[0013] As one of the implementation modes, an upper connecting plate is provided at the top of the upper cross beam, and the upper connecting plate is respectively connected to the inner limb surfaces of the two tower limbs; and / or, a lower connecting plate is provided at the bottom of the upper cross beam, and the lower connecting plate is respectively connected to the inner limb surfaces of the two tower limbs.

[0014] As one of the implementation modes, when the upper connecting plate is provided in the cantilever-arm steel box girder cable-stayed bridge in the highway-railway flat-level bridge tower, the upper connecting plate is a groove-shaped structure and is surrounded by two tower limbs to form a shuttle-shaped cavity.

[0015] The present invention has at least the following beneficial effects:

[0016] In the present invention, the cantilever steel box girder is used in the standard section of the main beam, which can improve the bending and torsional rigidity of the main beam and the wind and windmill bridge performance, and effectively reduce the steel consumption of the main beam, ensuring the economy of the main beam through the tower of the road-rail flat bridge. The tower through-through transition section adopts a separated steel box girder, and the organic and smooth connection between the tower through-through transition section and the main beam standard section is achieved through the main beam change section of the integral steel box girder structure, solving the key technical problem that the traditional cantilever steel box girder section cannot be applied to the road-rail flat bridge tower through-through solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a steel box girder cable-stayed bridge with cantilever arms passing through a highway-railway flat-floor bridge tower provided by an embodiment of the present invention;

[0019] Figure 2A schematic diagram of the structure of a through-type main beam for a road-rail flat-floor bridge tower provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the structure of a standard section of a main beam provided by an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the structure of the main beam change section provided by an embodiment of the present invention

[0022] Figure 5 A schematic diagram of the structure of a transition section passing through a bridge tower provided by an embodiment of the present invention;

[0023] Figure 6 and Figure 7 A schematic structural diagram of a bridge tower provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1

[0026] like Figure 1 and Figure 2 The embodiment of the present invention provides a main beam 1 for passing through a flat-floor bridge tower, comprising a plurality of main beam standard sections 11 and at least one bridge tower through-through transition section 12 for passing through a bridge tower 2, each of the bridge tower through-through transition sections 12 is connected to an adjacent main beam standard section 11 through a main beam change section 13, wherein, Figure 3 to Figure 5 The main beam standard section 11 adopts a cantilever steel box beam, the bridge tower intermediate transition section 12 adopts a separated steel box beam, and the main beam change section 13 adopts an integral steel box beam.

[0027] It can be understood that the above-mentioned main beam standard section 11 is the same as the span number of the bridge and is configured in a one-to-one correspondence; the highway-railway flat-deck bridge generally has multiple bridge towers 2, and the above-mentioned bridge towers have multiple corresponding transition sections 12; obviously, there is a main beam standard section 11 on both sides of the transition section 12 in each bridge tower, and each end of the transition section 12 in each bridge tower is connected to a main beam change section 13.

[0028] The cantilever steel box girder, the integral steel box girder and the separated steel box girder are all existing steel box girder structures in the art, and the specific structures are not described in detail here. For the connection between the cantilever steel box girder and the integral steel box girder, and the connection between the integral steel box girder and the separated steel box girder, conventional steel box girder beam section connection methods can be adopted, which are not described in detail here.

[0029] Generally, for a bridge with a bridge tower passing through, the bridge tower 2 is a multi-limb structure, which can be divided into left and right tower limbs 21; in one embodiment, as Figure 5 The above-mentioned bridge tower mid-through transition section 12 includes a middle box girder body 121 for connecting to the tower limbs 21 on both sides of the bridge tower 2, and two sets of side box girder bodies 122 for being installed on the outer sides of the tower limbs 21 on the corresponding sides, that is, the middle box girder body 121 is arranged between the left tower limb 21 and the right tower limb 21 of the bridge tower 2, and the middle box girder body 121 is transversely connected to the left tower limb 21 and the right tower limb 21 respectively. The tower limb 21 is used as the connection node of the separated steel box girder to ensure the reliability of the installation structure of the bridge tower mid-through transition section 12. Further preferably, the side box girder body 122 is consistent with the cantilever shape of the main beam standard section 11, which can improve the appearance of the bridge; it can be understood that the main beam change section 13 is also preferably consistent with the shape of the main beam standard section 11; the use of a beam structure with a consistent shape can not only ensure the aesthetic effect, but also simplify the design and construction difficulty accordingly, and make the stiffness transition between the beam sections smooth.

[0030] The above-mentioned highway-railway level bridge is preferably a cable-stayed bridge, and steel anchor boxes can be correspondingly arranged in the main beam standard section 11 and the main beam variable section 13.

[0031] like Figure 2 and Figure 4 The above-mentioned main beam change section 13 includes a first beam body and two groups of second beam bodies arranged transversely at both ends of the first beam body, wherein the first beam body includes a top plate, a bottom plate and two end longitudinal beams distributed between the top plate and the bottom plate, the upper and lower ends of the end longitudinal beams are respectively connected to the top plate and the bottom plate, and a middle longitudinal beam of the change section can be further arranged as needed; the two end longitudinal beams have inclined sections to facilitate connection with the standard section longitudinal beams on the corresponding side main beam standard section 11, and the two inclined sections are relatively arranged to form a trumpet-shaped structure, and the large opening end of the trumpet-shaped structure faces the main beam standard section 11 on the corresponding side; the other end of the above-mentioned inclined section (that is, the small opening end of the trumpet-shaped structure) can be directly connected to the middle box longitudinal beam on the middle box beam body 121 of the adjacent bridge tower passing through the transition section 12. In another embodiment, the two end longitudinal beams also have a transition connection section parallel to the longitudinal direction of the bridge, and the transition connection section is respectively connected to the middle box longitudinal beam on the adjacent middle box beam body 121 and the corresponding inclined section. The variable section edge longitudinal beam on the above-mentioned second beam body can be designed to be parallel to the longitudinal direction of the bridge, and its two ends are respectively connected to the standard section longitudinal beam on the adjacent main beam standard section 11 and the side box longitudinal beam on the adjacent side box beam body 122.

[0032] The main beam standard section 11 adopts a cantilever steel box beam, which can improve the bending and torsional rigidity of the main beam 1 as well as the wind and windmill resistance performance, while effectively reducing the steel consumption of the main beam 1 and ensuring the economy of the through-type main beam 1 in the road-rail flat bridge tower.

[0033] The transition section 12 passing through the bridge tower adopts a separated steel box girder, and the organic and smooth connection between the transition section 12 passing through the bridge tower and the main beam standard section 11 is achieved through the main beam change section 13 of the integral steel box girder structure, which solves the key technical problem that the traditional cantilever steel box girder section cannot be applied to the mid-penetration scheme of the road-rail flat bridge tower 2.

[0034] Embodiment 2

[0035] An embodiment of the present invention provides a cantilever steel box girder cable-stayed bridge with a road-rail flat-level bridge tower, comprising at least one bridge tower 2 and a main beam 1 with a road-rail flat-level bridge tower provided in the first embodiment. The number of transition sections 12 passing through the bridge tower is the same as the number of the bridge towers 2 and are arranged in a one-to-one correspondence, and the number of main beam standard sections 11 is the same as the number of bridge spans and are arranged in a one-to-one correspondence.

[0036] The above-mentioned bridge tower 2 can adopt conventional bridge tower structural types such as H-type bridge tower, A-type bridge tower, inverted Y-type bridge tower, diamond-type bridge tower, etc. Among them, the H-type bridge tower can meet the design requirements of the bridge tower vertically passing through the main beam, and the cross-sectional width of the main beam is small, but the H-type bridge tower is relatively conventional in shape, the landscape is slightly poor, the lateral stability of the bridge tower and the lateral stiffness of the main beam are small, and the bridge tower foundation scale is large; when using A-shaped, inverted Y-shaped or diamond-shaped bridge towers, the bridge tower 2 passes through the main beam 1 obliquely (that is, it has an angle with the main beam bridge deck). In order to meet the maintenance requirements, the width of the main beam needs to be increased by about 2m compared with the vertical passing bridge tower solution, which is less economical.

[0037] Embodiment 3

[0038] like Figure 6 and Figure 7 An embodiment of the present invention provides a bridge tower 2, which can be applied to the above-mentioned embodiment 2. The bridge tower 2 includes a tower column and a supporting foundation 22. The tower column is a shuttle-shaped structure that is wide in the middle and gradually narrows upward and downward.

[0039] For the above-mentioned shuttle-shaped tower column, the middle area is relatively wide, and the tower column gradually narrows toward the top and the bottom of the tower; that is, the cross section of the tower column (the cross section is parallel to the vertical direction) is shuttle-shaped. The shuttle-shaped tower column is like a fish or a boat, and has good landscape; the cable 3 is a spatial cable (different from the plane cable of the H-type bridge tower), which can make the main beam 1 obtain a higher torsional natural frequency and increase its critical flutter wind speed.

[0040] The supporting foundation 22 can adopt conventional structures such as a cap, which will not be described in detail here. The lower part of the tower column is narrowed at the supporting foundation 22, which can reduce the lateral size of the bridge tower supporting foundation 22, reduce the wave and current force and cofferdam structure size borne by the supporting foundation 22, and reduce the impact on factors such as the surrounding island red line, which is economical and environmentally friendly.

[0041] As for the tower column of the shuttle structure, it can be understood that it has two tower limbs 21. As a preferred solution, the tower column is a vertical transition type within the range of the main beam 1, so as to achieve the design effect of the bridge tower 2 vertically passing through the main beam 1. The tower limb 21 vertically passes through the main beam bridge deck, which can reduce the main beam width of the highway-railway flat-level bridge tower through-type cable-stayed bridge, and has good economy. Specifically, the two tower limbs 21 of the tower column have vertical limb sections with limb surfaces parallel to the vertical direction, and the bridge tower through-through transition section 12 is respectively connected to the vertical limb sections on both sides.

[0042] In one embodiment, if Figure 6 and Figure 7 The lower part of the tower column is provided with a lower cross beam 23, and the two ends of the lower cross beam 23 are respectively connected to the two tower limbs 21 of the tower column; the bridge tower middle transition section 12 includes a middle box beam body 121 and two sets of side box beam bodies 122 respectively installed on the outer sides of the tower limbs 21 on the corresponding sides, and the middle box beam body 121 is supported on the lower cross beam 23 and is respectively connected to the two tower limbs 21 in a transverse direction. The lower cross beam 23 not only plays the role of supporting and installing the main beam 1, but also improves the structural integrity and coordinated force bearing of the two tower limbs 21, and ensures the operational reliability of the tower column.

[0043] More preferably, if Figure 6 The outer edges of the two tower limbs 21 are provided with corbels 24, and each set of side box beams 122 is supported on the corbels 24 on the corresponding side and is laterally connected to the tower limb 21 on the corresponding side. The side box beams 122 passing through the transition section 12 in the bridge tower are supported by the corbels 24, which can ensure the installation structure reliability and operation safety of the separated steel box beam.

[0044] More preferably, if Figure 6 and Figure 7 The upper part of the tower column is provided with an upper crossbeam 25, and the two ends of the upper crossbeam 25 are respectively connected to the two tower limbs 21 of the tower column. The upper parts of the two tower limbs 21 are connected as one by the upper crossbeam 25, which can improve the structural integrity and coordinated force bearing of the two tower limbs 21. In particular, the vicinity of the upper crossbeam 25 is the tensioning area of ​​the inclined cable 3, thereby ensuring the operational reliability of the tower column; and because the tower top is narrow, the length of the upper crossbeam 25 is small, and its lateral connection function is better.

[0045] More preferably, if Figure 6, an upper connecting plate 26 is provided at the top of the upper crossbeam 25, and the upper connecting plate 26 is respectively connected to the inner limb surfaces of the two tower limbs 21; and / or, a lower connecting plate 27 is provided at the bottom of the upper crossbeam 25, and the lower connecting plate 27 is respectively connected to the inner limb surfaces of the two tower limbs 21. By providing the upper connecting plate 26 / lower connecting plate 27, the connection reliability and structural integrity of the upper crossbeam 25 and the two tower limbs 21 can be further improved; at the same time, the appearance design of the connecting plate can further improve the aesthetics of the tower column, for example, the upper connecting plate 26 is a groove structure and is surrounded by the two tower limbs 21 to form a shuttle-shaped cavity.

[0046] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cantilever steel box girder cable-stayed bridge with a road-rail level bridge tower, comprising at least one bridge tower and a main girder with a road-rail level bridge tower, characterized in that: The main beam of the road-rail flat-bridge tower-through type includes multiple main beam standard sections and at least one tower-through transition section for passing through the bridge tower, the number of the tower-through transition sections is the same as the bridge towers and they are arranged in a one-to-one correspondence, and the main beam standard sections are the same as the number of bridge spans and they are arranged in a one-to-one correspondence; each of the tower-through transition sections is connected to the adjacent main beam standard section through a main beam variation section, wherein the main beam standard section adopts a cantilever steel box beam, the tower-through transition section adopts a separated steel box beam, and the main beam variation section adopts an integral steel box beam.

2. The cantilever steel box girder cable-stayed bridge with horizontal bridge towers for highway and railway as claimed in claim 1, characterized in that: The transition section in the bridge tower includes a middle box beam body for connecting to the two side tower limbs of the bridge tower and two sets of side box beam bodies for being installed on the outside of the corresponding side tower limbs. The side box beam bodies are consistent with the cantilever shape of the main beam standard section.

3. The cantilever steel box girder cable-stayed bridge with horizontal bridge towers for highway and railway as claimed in claim 1, characterized in that: The bridge tower comprises a tower column and a supporting foundation, and the tower column is a shuttle-shaped structure which is wide in the middle and gradually narrows upwards and downwards.

4. The cantilever steel box girder cable-stayed bridge with horizontal bridge towers for highway and railway as claimed in claim 3, characterized in that: The two tower limbs of the tower column both have vertical limb sections with limb surfaces parallel to the vertical direction, and the transition section passing through the bridge tower is respectively connected to the vertical limb sections on both sides.

5. The cantilever steel box girder cable-stayed bridge with horizontal bridge towers for highway and railway as claimed in claim 3, characterized in that: A lower cross beam is provided at the lower part of the tower column, and the two ends of the lower cross beam are respectively connected to the two tower limbs of the tower column; the transition section passing through the bridge tower includes a middle box beam body and two groups of side box beam bodies respectively installed on the outer sides of the tower limbs on the corresponding sides, and the middle box beam body is supported on the lower cross beam and is laterally connected to the two tower limbs respectively.

6. The cantilever steel box girder cable-stayed bridge with horizontal bridge towers for highway and railway as claimed in claim 5, characterized in that: The outer edges of the two tower limbs are provided with corbels, and each set of side box beam bodies is supported on the corbels on the corresponding side and is laterally connected to the tower limb on the corresponding side.

7. The cantilever steel box girder cable-stayed bridge with horizontal bridge towers for highway and railway as claimed in claim 3, characterized in that: An upper cross beam is arranged on the upper part of the tower column, and two ends of the upper cross beam are respectively connected to two tower limbs of the tower column.

8. The cantilever steel box girder cable-stayed bridge with horizontal bridge towers for highway and railway as claimed in claim 7, characterized in that: An upper connecting plate is provided at the top of the upper crossbeam, and the upper connecting plate is respectively connected to the inner limb surfaces of the two tower limbs; and / or a lower connecting plate is provided at the bottom of the upper crossbeam, and the lower connecting plate is respectively connected to the inner limb surfaces of the two tower limbs.

9. The cantilever steel box girder cable-stayed bridge for railway and highway level bridge towers as claimed in claim 8, characterized in that: When the upper connecting plate is provided, the upper connecting plate is in a groove-shaped structure and is arranged with the two tower limbs to form a shuttle-shaped cavity.

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