A small-span double-arch bridge structure capable of reducing overall height

Abstract

The present invention relates to a small-span double-arch bridge structure capable of reducing the overall height, comprising two piers and a steel plate beam arranged at intervals, wherein the upper ends of the two piers on one side close to each other are recessed inwards and form a step, and the two ends of the steel plate beam are respectively arranged on the corresponding piers and located between the two piers, and a plurality of I-beams are provided between the steps of the two piers, and the two ends of the I-beams are respectively located on the corresponding steps, the top surface of the I-beams abuts the bottom of the steel plate beam, and the bottom surface of at least one end of the I-beams is connected and fixed to the horizontal surface of the corresponding step, and the surface of the steel plate beam is provided with a bridge deck pavement layer, and both the steel plate beam and the bridge deck pavement layer are arched in the direction of traffic flow, with the middle portion being higher than the two sides. The present invention enables the two-way bridge deck to form a double-arch structure, and supports the steel plate beam and the bridge deck pavement layer through the I-beams, thereby greatly reducing the overall height of the bridge, reducing the difficulty of construction, making driving more comfortable, and the overall structure of the bridge stable, with low subsequent maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a small-span double-arch bridge structure capable of reducing the overall height. Background Art

[0002] As the process of urbanization continues to advance, the demand for road traffic is increasing. Bridges are increasingly used in road traffic as a way to connect different sections of road. Especially when encountering gullies, rivers, lakes and seas, the cost of tunnels is usually relatively high and the construction is difficult. In most cases, bridges are used. In the existing technology, for small span bridges, such as Figure 1 As shown, basically all of them adopt a single arch structure, that is, an inclined bridge deck is formed between the two sides of the bridge. This bridge structure will raise the overall height of the bridge due to the height of the higher side, which makes the construction of the bridge more difficult and the cost will also increase. For example, due to the high overall height of the bridge, the amount of backfill earthwork at both ends of the bridge is large, the land area will also increase, and the bearing capacity of the roadbed will be reduced, which brings great difficulties to the construction of the bridge. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a small-span double-arch bridge structure that can reduce the overall height in response to the deficiencies of the above-mentioned prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a small-span double-arch bridge structure that can reduce the overall height, including two piers and steel plate beams arranged at intervals in the direction of traffic flow, the upper end edges of the two piers close to each other are recessed inward to form steps, and the two ends of the steel plate beam are respectively arranged on the corresponding piers and located between the two piers. A plurality of I-beams are arranged at intervals perpendicular to the direction of traffic flow between the steps of the two piers, and the two ends of the I-beams are respectively located on the corresponding steps, the top surface of the I-beam is in contact with the bottom of the steel plate beam, and the bottom surface of at least one end of the I-beam is connected and fixed to the horizontal surface of the corresponding step. The surface of the steel plate beam is provided with a bridge deck pavement layer, and the steel plate beam and the bridge deck pavement layer are both arched with the middle part higher than the two sides along the direction of traffic flow.

[0005] The beneficial effects of the present invention are as follows: the small-span double-arch bridge structure of the present invention can reduce the overall height, by arranging a steel plate beam between two piers, and then arranging a bridge deck pavement layer on the steel plate beam, the steel plate beam and the bridge deck pavement layer are both arched along the direction of traffic flow, with the middle part higher than the two sides, so that the two-way bridge deck forms a double-arch structure, and the steel plate beam and the bridge deck pavement layer are supported by I-beams, which greatly reduces the overall height of the bridge, reduces the difficulty of construction, makes driving more comfortable, and stabilizes the overall structure of the bridge, with low subsequent maintenance costs.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows:

[0007] Further: A supporting steel plate for supporting the I-beam is provided on the horizontal surface of the step, the bottom surface of at least one end of the I-beam is connected and fixed to the corresponding supporting steel plate, and a gap is left between the end surface of the I-beam and the vertical surface of the corresponding step.

[0008] The beneficial effect of the above further scheme is: by setting the supporting steel plate, on the one hand, a stable connection relationship can be formed between the I-beam and the pier; on the other hand, since the contact area between the supporting steel plate and the pier is larger, the supporting steel plate can provide better support for the I-beam.

[0009] Furthermore: one end of the I-beam is fixedly connected to the corresponding support steel plate, and the other end is movably connected to the corresponding support steel plate, and the other end of the I-beam can slide on the corresponding support steel plate.

[0010] The beneficial effect of the above further scheme is: by fixedly connecting one end of the I-beam with the corresponding supporting steel plate and movably connecting the other end with the corresponding supporting steel plate, when the bridge is deformed due to thermal expansion and contraction, the other end of the I-beam can produce relative displacement with the corresponding pier, which can ensure the stability of the overall structure of the bridge, greatly improve the reliability of the bridge, extend the service life of the bridge, and reduce the maintenance cost of the bridge.

[0011] Furthermore: the I-beams are connected and fixed by a plurality of ribs arranged along both sides of the steel plate beam.

[0012] The beneficial effect of the above further scheme is that by providing a plurality of the ribs, a plurality of I-beams can be connected into a whole, ensuring the support of the I-beams for the steel plate beams and the bridge deck pavement layer, avoiding relative displacement between the I-beams due to force, and further improving the stability of the bridge structure.

[0013] Furthermore: two ends of the steel plate beam extend out of corresponding two ends of the bridge deck pavement layer respectively, and a transition section is provided at the portion of the steel plate beam extending out of the corresponding bridge deck pavement layer.

[0014] The beneficial effect of the above further scheme is: by extending the two ends of the steel plate beam to extend out from the corresponding two ends of the bridge deck pavement layer, and providing a transition section at the extended part, on the one hand, it can make the vehicle more comfortable when passing and reduce the wear on the vehicle tires; on the other hand, the connection between the bridge deck pavement layer and the steel plate beam can be made more stable through the transition section.

[0015] Further: the transition section includes an inclined transition steel plate, one end of the transition steel plate is connected to the corresponding end of the bridge deck pavement layer, and the other end is connected to the corresponding steel plate beam, and concrete is poured in the area formed by the transition steel plate, steel plate beam and bridge deck pavement layer.

[0016] The beneficial effects of the above further scheme are: by arranging the transition steel plates at an angle, transition sections can be formed at both ends of the bridge, which facilitates the smooth passage of vehicles and makes driving more comfortable; and, by pouring concrete in the area formed by the transition steel plates, steel plate beams and bridge deck pavement, the transition steel plates can be better supported, thereby ensuring the strength of the transition steel plates and further improving the structural stability of the transition section.

[0017] Furthermore: arc-shaped chamfers are respectively provided at the connection points between the two ends of the transition steel plate and the bridge deck pavement layer and the steel plate beam.

[0018] The beneficial effect of the above further scheme is that by setting chamfers at the connection between the two ends of the transition steel plate and the bridge deck pavement layer and the steel plate beam, the vehicle can pass through the connection more smoothly, avoiding damage to the vehicle tires or vehicle bumps due to insufficient flatness.

[0019] Furthermore: the thickness of the transition steel plate gradually decreases from one end to the other end.

[0020] The beneficial effect of the above further solution is that by gradually reducing the thickness of the transition steel plate from one end to the other, the corresponding connection between the transition steel plate and the steel plate beam can be more convenient, further reducing the construction difficulty and ensuring the integrity of the transition section structure.

[0021] Furthermore: drainage channels are provided between the two sides of the bridge deck pavement layer perpendicular to the direction of traffic flow and the roadbed sections on the corresponding sides.

[0022] The beneficial effect of the above further scheme is that by providing drainage ditches between the two sides of the bridge deck pavement layer perpendicular to the direction of traffic flow and the roadbed sections on the corresponding sides, rainwater on the bridge deck can be discharged to the corresponding roadbed sections in a timely and smooth manner, avoiding the unavoidable need to drill holes in the bridge deck in the existing technology and also avoiding damage to the entire bridge deck. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a cross-sectional structure of a small-span single-arch bridge structure in the prior art;

[0024] Figure 2 A schematic cross-sectional view of a small-span double-arch bridge structure capable of reducing the overall height according to the present invention;

[0025] Figure 3It is a schematic diagram of an enlarged structure of the middle portion of the longitudinal section of a small-span double-arch bridge structure capable of reducing the overall height of the present invention;

[0026] Figure 4 This is a schematic diagram of the longitudinal cross-section of a small-span double-arch bridge structure capable of reducing the overall height according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the longitudinal section structure of a small-span double-arch bridge structure that can reduce the overall height according to another example of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Pier, 2. Steel plate beam, 3. I-beam, 4. Bridge deck pavement, 5. Support steel plate, 6. Rib plate, 7. Transition steel plate, 8. Concrete, 9. Spillway. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 2 and Figure 3 As shown, a small-span double-arch bridge structure that can reduce the overall height includes two piers 1 and steel plate beams 2 that are spaced apart in the direction of traffic flow. The upper end edges of the two piers 1 on one side close to each other are recessed inward to form steps. The two ends of the steel plate beam 2 are respectively arranged on the corresponding piers 1 and are located between the two piers 1. A plurality of I-beams 3 are spaced apart between the steps of the two piers 1 along the direction of traffic flow, and the two ends of the I-beams 3 are respectively located on the corresponding steps. The top surface of the I-beam 3 is in contact with the bottom of the steel plate beam 2, and the bottom surface of at least one end of the I-beam 3 is connected and fixed to the horizontal surface of the corresponding step. A bridge deck pavement layer 4 is provided on the surface of the steel plate beam 2. Both the steel plate beam 2 and the bridge deck pavement layer 4 are arched with the middle part higher than the two sides along the direction of traffic flow.

[0032] The small-span double-arch bridge structure of the present invention can reduce the overall height. A steel plate beam 2 is arranged between two piers, and a bridge deck pavement layer 4 is arranged on the steel plate beam 2. Both the steel plate beam 2 and the bridge deck pavement layer 4 are arched in the middle along the direction of traffic flow, and are higher than the two sides. This makes the two-way bridge deck form a double-arch structure, and the steel plate beam 2 and the bridge deck pavement layer 4 are supported by the I-beam 3, which greatly reduces the overall height of the bridge, reduces the difficulty of construction, makes driving more comfortable, and stabilizes the overall structure of the bridge, and has low subsequent maintenance costs.

[0033] By making the steel plate beam 2 and the bridge deck pavement layer 4 arched in the middle along the traffic direction and higher than the two sides, the two-way lane of the bridge deck can form a double road arch. In the embodiment of the present invention, the transverse slope of the bridge deck pavement layer 4 is 2%.

[0034] In one or more embodiments of the present invention, a support steel plate 5 for supporting the I-beam 3 is provided on the horizontal surface of the step. The bottom surface of at least one end of the I-beam 3 is connected and fixed to the corresponding support steel plate 5, and a gap is left between the end surface of the I-beam 3 and the vertical surface of the corresponding step. The provision of the support steel plate 5, on the one hand, can form a stable connection between the I-beam 3 and the pier 1, and on the other hand, due to the larger contact area between the support steel plate 5 and the pier 1, the support steel plate 5 can provide better support for the I-beam 3.

[0035] In practice, in order to achieve a better supporting effect, multiple I-beams 3 are evenly spaced between the steps of the two piers 1 along the direction perpendicular to the traffic flow, and since the steel plate beam 2 and the bridge deck pavement layer 4 are both arched with the middle higher than the two sides along the traffic flow direction, the height of each I-beam 3 is not equal. In practice, the height of the I-beam 3 needs to be adjusted according to the placement position of the I-beam 3 so that the top surface of each I-beam 3 abuts against the bottom of the steel plate beam 2 to ensure the supporting effect.

[0036] Optionally, in one or more embodiments of the present invention, one end of the I-beam 3 is fixedly connected to the corresponding support steel plate 5, and the other end is movably connected to the corresponding support steel plate 5, and the other end of the I-beam 3 can slide on the corresponding support steel plate 5. By fixedly connecting one end of the I-beam 3 to the corresponding support steel plate 5 and movably connecting the other end to the corresponding support steel plate 5, when the bridge is deformed due to thermal expansion and contraction, the other end of the I-beam 3 can produce relative displacement with the corresponding pier 1, thereby ensuring the stability of the overall bridge structure, greatly improving the reliability of the bridge, extending the service life of the bridge, and reducing the maintenance cost of the bridge.

[0037] In an embodiment of the present invention, one end of the I-beam 3 is connected and fixed to the corresponding supporting steel plate 5 by means of bolts and nuts, and the other end of the I-beam 3 can be directly placed on the corresponding supporting steel plate 5, or can be movably connected by means of waist-round holes and bolts. In this way, when the steel plate beam 2 and the bridge deck pavement layer 4 are deformed due to thermal expansion and contraction, the other end of the I-beam 3 can slide relative to the corresponding supporting steel plate 5, ensuring that the overall structure of the bridge will not have structural stability defects due to thermal expansion and contraction.

[0038] Optionally, in one or more embodiments of the present invention, the I-beams 3 are connected and fixed by a plurality of ribs 6 provided along the two sides of the steel plate beam 2. By providing a plurality of the ribs 6, the plurality of I-beams 3 can be connected as a whole, ensuring the support of the I-beams for the steel plate beam 2 and the bridge deck pavement 4, avoiding relative displacement between the I-beams due to force, and further improving the stability of the bridge structure. Here, a plurality of the ribs 6 can be provided at intervals perpendicular to the direction of traffic flow between two adjacent I-beams 3, and each rib 6 can be connected to a plurality of I-beams 3 along the direction perpendicular to the direction of traffic flow. In practice, the connection between the ribs 6 and the I-beams 3 can be achieved by welding.

[0039] In one or more embodiments of the present invention, the ends of the steel plate girder 2 extend beyond the corresponding ends of the bridge deck pavement 4, and a transition section is provided at the portion of the steel plate girder 2 extending beyond the corresponding ends of the bridge deck pavement 4. Extending the ends of the steel plate girder 2 beyond the corresponding ends of the bridge deck pavement 4 and providing the transition section at the extending portion not only improves vehicle comfort during passage and reduces wear on vehicle tires, but also provides a more stable connection between the bridge deck pavement 4 and the steel plate girder 2 through the transition section.

[0040] In one or more embodiments of the present invention, the transition section includes an inclined transition steel plate 7, one end of which is connected to the corresponding end of the bridge deck pavement layer 4 and the other end is connected to the corresponding steel plate girder 2. Concrete 8 is poured in the area formed by the transition steel plate 7, the steel plate girder 2, and the bridge deck pavement layer 4. The inclined transition steel plate 7 can form a transition section at both ends of the bridge, facilitating smooth passage of vehicles and making driving more comfortable. In addition, by pouring concrete 8 in the area formed by the transition steel plate 7, the steel plate girder 2, and the bridge deck pavement layer 4, the transition steel plate 7 can be better supported, ensuring the strength of the transition steel plate 7 and further enhancing the structural stability of the transition section.

[0041] In practice, the two ends of the transition steel plate 7 are first connected to one end of the corresponding steel plate beam 2 and one end of the bridge deck pavement layer 4 (usually welded), and then concrete 8 is poured into the steel plate beam 2 and the bridge deck pavement layer 4. After the concrete solidifies, a structurally stable transition section can be formed.

[0042] Optionally, in one or more embodiments of the present invention, cambered corners are provided at the junctions between the two ends of the transition steel plate 7 and the bridge deck pavement layer 4 and the steel plate beam 2. Providing chamfers at the junctions between the two ends of the transition steel plate 7 and the bridge deck pavement layer 4 and the steel plate beam 2 allows vehicles to pass more smoothly through the junctions, avoiding damage to vehicle tires or vehicle jolting due to insufficient flatness.

[0043] Optionally, in one or more embodiments of the present invention, the thickness of the transition steel plate 7 gradually decreases from one end to the other. By gradually decreasing the thickness of the transition steel plate 7 from one end to the other, the corresponding connection between the transition steel plate 7 and the steel plate beam 2 can be more convenient, further reducing the construction difficulty and ensuring the integrity of the transition section structure.

[0044] In one or more embodiments of the present invention, drainage channels 9 are provided between the two sides of the bridge deck pavement 4 perpendicular to the direction of traffic flow and the corresponding roadbed sections. By providing drainage channels 9 between the two sides of the bridge deck pavement 4 perpendicular to the direction of traffic flow and the corresponding roadbed sections, rainwater on the bridge deck can be drained promptly and smoothly to the corresponding roadbed sections, avoiding the need to drill holes in the bridge deck as in the prior art and also preventing damage to the entire bridge deck.

[0045] like Figure 4 As shown in FIG. 1 , in an example application of the present invention, when the bridge deck is designed for a speed of 40 km / h, according to relevant design requirements, the length of the slope in both directions is not less than 120 m, and the radius of the slope is 1200 m. Then, when the longitudinal slope is 3% and the longitudinal slope is 4%, the height difference of the entire bridge deck is 0.78 m. Figure 5 As shown, when the bridge deck is designed for a speed of 60 km / h, according to relevant design requirements, the bidirectional slope length is no less than 150 meters, and the slope radius is 2000 meters. Therefore, when the longitudinal slope is 3% and the longitudinal slope is 4%, the height difference of the entire bridge deck is 0.8 meters. Therefore, by using the double-arch bridge structure of the present invention and properly adjusting the center span, the height of the entire bridge can be significantly reduced.

[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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A short-span double-arch bridge structure capable of reducing overall height, characterized by: The invention comprises two piers (1) and a steel plate beam (2) arranged at intervals in the direction of traffic flow, wherein the upper end edges of the two piers (1) on one side close to each other are recessed inwards and form steps, and the two ends of the steel plate beam (2) are respectively arranged on the corresponding piers (1) and located between the two piers (1). A plurality of I-beams (3) are arranged at intervals perpendicular to the direction of traffic flow between the steps of the two piers (1), and the two ends of the I-beams (3) are respectively located on the corresponding steps, the top surface of the I-beam (3) abuts against the bottom of the steel plate beam (2), and the bottom surface of at least one end of the I-beam (3) is connected and fixed to the horizontal surface of the corresponding step, and a bridge deck pavement layer (4) is provided on the surface of the steel plate beam (2), and the steel plate beam (2) and the bridge deck pavement layer (4) are both arched in the middle along the direction of traffic flow, which is higher than the two sides; A support steel plate (5) for supporting the I-beam (3) is provided on the horizontal surface of the step, the bottom surface of at least one end of the I-beam (3) is connected and fixed to the corresponding support steel plate (5), a gap is left between the end surface of the I-beam (3) and the vertical surface of the corresponding step, one end of the I-beam (3) is connected and fixed to the corresponding support steel plate (5), and the other end is movably connected to the corresponding support steel plate (5), and the other end of the I-beam (3) can slide relative to the corresponding support steel plate (5); The two ends of the steel plate beam (2) extend out of the corresponding two ends of the bridge deck pavement layer (4), and the portion of the steel plate beam (2) extending out of the corresponding bridge deck pavement layer (4) is provided with a transition section.

2. The small-span double-arch bridge structure capable of reducing overall height according to claim 1, characterized in that: The I-beams (3) are connected and fixed via a plurality of ribs (6) arranged between two sides of the steel plate beam (2).

3. The small-span double-arch bridge structure capable of reducing overall height according to claim 1, characterized in that: The transition section comprises an inclined transition steel plate (7), one end of the transition steel plate (7) being connected to one end corresponding to the bridge deck pavement layer (4), and the other end being connected to the steel plate beam (2), and concrete (8) being poured in the area formed by the transition steel plate (7), the steel plate beam (2) and the bridge deck pavement layer (4).

4. The small-span double-arch bridge structure capable of reducing overall height according to claim 3 is characterized in that: Arc-shaped chamfers are respectively provided at the connection points between the two ends of the transition steel plate (7) and the bridge deck pavement layer (4) and the steel plate beam (2).

5. The small-span double-arch bridge structure capable of reducing overall height according to claim 3 is characterized in that: The thickness of the transition steel plate (7) gradually decreases from one end to the other end.

6. The short-span double-arch bridge structure capable of reducing overall height according to any one of claims 1 to 5, characterized in that: Drainage channels (9) are provided between the two sides of the bridge deck pavement layer (4) perpendicular to the traffic flow direction and the roadbed sections on the corresponding sides.

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