Flat cable-stayed bridge with openwork deck

Abstract

The application discloses a flat cable bridge with a hollow bridge deck, comprising a plurality of steel cables arranged in the same direction and tensioned, the steel cables being paved with the bridge deck, and the bridge deck being formed with hollow holes capable of allowing wind to vertically pass through. The bridge deck paved with the hollow holes on the steel cables can make the airflow above and below the bridge deck intercommunicate, effectively change the flow pattern around the bridge, reduce the pressure difference between the upper and lower surfaces of the bridge, and further achieve the purpose of improving the aerodynamic stability of the bridge.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of flat cable-stayed bridge, and particularly relates to a flat cable-stayed bridge with a hollow bridge deck. BACKGROUND

[0002] The flat cable-stayed bridge is different from rigid structure bridges such as steel bridges and concrete bridges, and belongs to the category of flexible structure bridge system. Compared with other bridge types, the flat cable-stayed bridge has the advantages of fast erection speed, less engineering investment and small construction difficulty. In the mountainous areas of Yunnan, Guizhou and Sichuan, the flat cable-stayed bridge is particularly suitable for solving the problem of traffic travel of residents in the mountainous areas. However, due to the simple structure form, the light and flexible bridge deck, the small rigidity and the poor wind resistance, the wind-induced vibration phenomenon of the flat cable-stayed bridge occurs from time to time. The existing flat cable-stayed bridge only improves the wind resistance of the flat cable-stayed bridge by setting a stabilizing beam, but the effect is very limited and still difficult to achieve the expected effect. Therefore, there is an urgent need for a flat cable-stayed bridge with a hollow bridge deck which can further improve the wind resistance stability. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a flat cable-stayed bridge with a hollow bridge deck.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] A flat cable-stayed bridge with a hollow bridge deck comprises a plurality of steel cables arranged in the same direction and tensioned, a bridge deck is laid flat on the steel cables, and a hollow hole capable of allowing wind flow to pass vertically is formed on the bridge deck.

[0006] As a further improvement of the above technical scheme:

[0007] The bridge deck comprises a bridge deck A in which the hollow hole is formed and a bridge deck B in which the hollow hole is not formed, and the bridge deck A and the bridge deck B are alternately / continuously laid along the longitudinal direction of the bridge.

[0008] The hollow holes formed on the bridge deck A are arranged in an array.

[0009] The bridge deck is fixed with the steel cable through a connecting mechanism, the connecting mechanism comprises a connecting buckle for clamping the steel cable and a fastening bolt penetrating through the connecting buckle and the bridge deck at the same time, and the connecting buckle and the bridge deck are fixed with each other by screwing the fastening bolt.

[0010] The connecting buckle is arranged in a waist type, which can clamp two steel cables at the same time, and the two steel cables are symmetrically distributed on both sides of the fastening bolt.

[0011] The bridge deck panel comprises a vehicle roadway panel for carrying vehicles and a pedestrian panel for carrying pedestrians, the vehicle roadway panel is arranged in the middle of the deck of the deck cable-stayed bridge in the longitudinal direction, and two rows of pedestrian panels are arranged on both sides of the vehicle roadway panel in the longitudinal direction.

[0012] The vehicle roadway panel is arranged as a flat plate, and the pedestrian panel is arranged as a bent plate; the elevation of the vehicle roadway panel is lower than the tread elevation of the pedestrian panel.

[0013] The vehicle roadway panel and the pedestrian panel are fixed with the steel cable through the connecting mechanism.

[0014] The edge of the bridge deck panel is provided with angle steels in the longitudinal direction for connecting adjacent bridge deck panels into a whole, and the angle steels are connected with the bridge deck panel through fastening bolts.

[0015] The joint of the vehicle roadway panel and the pedestrian panel is provided with angle steels, which are connected with the vehicle roadway panel and the pedestrian panel respectively to connect them into a whole.

[0016] Compared with the prior art, the advantages of the present application are that:

[0017] By laying the bridge deck panel with the hollow holes on the steel cable, the airflow above and below the bridge deck can be communicated, so as to effectively change the flow pattern around the bridge, reduce the pressure difference between the upper and lower surfaces of the bridge, and further achieve the purpose of improving the aerodynamic stability of the bridge. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of the deck cable-stayed bridge;

[0019] Figure 2 is an assembly schematic view of the connecting mechanism;

[0020] Figure 3 is a structural schematic view of the vehicle roadway panel;

[0021] Figure 4 is a structural schematic view of the pedestrian panel;

[0022] Figure 5 is a change of the bridge flutter critical wind speed with the area ratio of the hollow holes.

[0023] In the drawings, the reference numbers represent: 1, steel cable; 2, bridge deck panel; 21, bridge deck panel A; 22, bridge deck panel B; 23, vehicle roadway panel; 24, pedestrian panel; 241, tread; 3, hollow hole; 4, connecting mechanism; 41, connecting buckle; 42, fastening bolt; 5, angle steel; 6, balance beam; 7, balance cable. DETAILED DESCRIPTION

[0024] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0025] As Figures 1 to 4 shown, the flat cable bridge with hollow bridge deck panel of the embodiment comprises several steel cables 1 arranged in the same direction and tensioned, and the bridge deck panel 2 is laid on the steel cables 1, and the hollow holes 3 capable of making the wind flow vertically through are formed on the bridge deck panel 2. By laying the bridge deck panel 2 with the hollow holes 3 on the steel cables 1, the airflow above and below the bridge deck can communicate with each other, thereby effectively changing the flow pattern around the bridge, reducing the pressure difference between the upper and lower surfaces of the bridge, and further achieving the purpose of improving the aerodynamic stability of the bridge. Generally, the bridge deck panel 2 can be selected from wooden bridge deck panel or steel bridge deck panel.

[0026] In the embodiment, the bridge deck panel 2 comprises the bridge deck panel A21 with the hollow holes 3 formed thereon and the bridge deck panel B22 without the hollow holes 3 formed thereon, and the bridge deck panel A21 and the bridge deck panel B22 are alternately / continuously laid along the longitudinal bridge direction. The hollow holes 3 formed on the bridge deck panel A21 are arranged in an array. By opening the hollow holes 3 on the bridge deck panel 2, the pressure difference between the upper and lower surfaces of the bridge can be reduced, thereby improving the aerodynamic stability of the flat cable bridge. However, the opening will cause the load-bearing capacity of the bridge deck panel 2 to decrease. By setting the bridge deck panel B22 without the opening and alternately laying it with the bridge deck panel A21 with the opening, the flat cable bridge can not only reduce the pressure difference between the upper and lower surfaces of the bridge, but also have the expected load-bearing capacity. At the same time, the number, shape and arrangement of the hollow holes 3 can be adjusted according to the wind field characteristics at the bridge site and the structural characteristics of the flat cable bridge. Specifically, the area ratio of the hollow holes 3 can be determined according to the wind permeability, i.e. the hollow hole area / total area is generally 0%-40%. The spacing of the bridge deck panel A21 considers the convenience of construction, which is generally in units of panel length, and can be set according to multiples of the panel length or continuously set (spacing is 0); the size of the hollow holes 3 considers the safety features size of driving and walking, which is generally set to 0-5 cm. Figure 5 For the change of the bridge flutter critical wind speed with the area ratio of the hollow holes 3, the hollow ratio can be set according to the design process.

[0027] In the embodiment, the bridge deck panel 2 is fixed with the steel cables 1 through the connecting mechanism 4, the connecting mechanism 4 comprises the connecting buckle 41 for clamping the steel cables 1, and the fastening bolt 42 penetrating through the connecting buckle 41 and the bridge deck panel 2 at the same time; by screwing the fastening bolt 42, the connecting buckle 41 and the bridge deck panel 2 can be fixed with each other. The connecting buckle 41 is set to a waist type, which can clamp two steel cables 1 at the same time, and the two steel cables 1 are symmetrically distributed on both sides of the fastening bolt 42. By setting the fastening bolt 42 penetrating through the connecting buckle 41 and the bridge deck panel 2 at the same time, by screwing the fastening bolt 42, the connecting buckle 41 and the bridge deck panel 2 can be close to and pressed each other, and form a fixed connection. By setting the connecting buckle 41 to a waist type, the two steel cables 1 can be simultaneously arranged in the connecting buckle 41 and distributed on both sides of the fastening bolt 42, so as to ensure that the stress of the bridge deck panel 2 is more uniform.

[0028] In this embodiment, the bridge deck 2 comprises a vehicle lane deck 23 for carrying vehicles and a sidewalk deck 24 for carrying pedestrians, the vehicle lane deck 23 is arranged in the middle of the flat cable-stayed bridge in the longitudinal direction, and the two rows of sidewalk decks 24 are arranged on both sides of the vehicle lane deck 23 in the longitudinal direction. The vehicle lane deck 23 is arranged as a flat plate, and the sidewalk deck 24 is arranged as a bent plate; the elevation of the vehicle lane deck 23 is lower than the elevation of the tread surface 241 of the sidewalk deck 24. The vehicle lane deck 23 and the sidewalk deck 24 are fixed to the steel cable 1 through the connecting mechanism 4. The edges of the bridge deck 2 are provided with angle steels 5 in the longitudinal direction for connecting adjacent bridge decks 2 into a whole, and the angle steels 5 are connected to the bridge deck 2 through fastening bolts 42. The joint of the vehicle lane deck 23 and the sidewalk deck 24 is provided with an angle steel 5, which is connected to the vehicle lane deck 23 and the sidewalk deck 24 respectively, so as to connect them into a whole. The vehicle lane deck 23 is used for carrying vehicles, and the sidewalk deck 24 is used for carrying pedestrians, and the required carrying capacity of the two is quite different. By dividing the bridge deck 2 into the vehicle lane deck 23 and the sidewalk deck 24 which are independent of each other, the structure can be adjusted according to the required carrying capacity of the two. At the same time, by arranging the sidewalk deck 24 as a bent plate and connecting it to the vehicle lane deck 23 through the angle steel 5, the tread surface of the sidewalk deck 24 is higher than that of the vehicle lane deck 23, so that the vehicle lane and the sidewalk can be divided by the step, and the vehicles can be prevented from driving onto the sidewalk deck 24. Furthermore, by arranging the angle steel 5 at the edge of the bridge deck 2 and connecting it to the adjacent bridge deck 2 at the same time, the overall performance of the flat cable-stayed bridge is enhanced.

[0029] Preferably, the flat cable-stayed bridge further comprises a plurality of balance beams 6 which are spaced apart in the longitudinal direction, the balance beams 6 are arranged in the transverse direction and the ends of the balance beams 6 extend out of the bridge deck 2, and the ends of the balance beams 6 are connected in series through a balance steel cable 7 which extends in the longitudinal direction.

[0030] Although the present application has been disclosed in the above preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, shall fall within the scope of protection of the technical solutions of the present application.

Claims

1. A flat-stayed cable-stayed bridge with a perforated bridge deck, characterized in that: It includes several steel cables (1) arranged in the same direction and tensioned, with a bridge deck (2) laid flat on the steel cables (1), and hollow holes (3) formed on the bridge deck (2) to allow airflow to pass through vertically. The bridge deck (2) includes a bridge deck A (21) with hollow holes (3) and a bridge deck B (22) without hollow holes (3). The bridge deck A (21) and the bridge deck B (22) are alternately paved along the longitudinal direction of the bridge, or the bridge deck A (21) is continuously paved along the longitudinal direction of the bridge. The perforated holes (3) formed on the bridge deck A (21) are arranged in an array; The bridge deck (2) is fixed to the steel cable (1) by a connecting mechanism (4). The connecting mechanism (4) includes a connecting buckle (41) for clamping the steel cable (1) and a fastening bolt (42) that passes through both the connecting buckle (41) and the bridge deck (2). By tightening the fastening bolt (42), the connecting buckle (41) and the bridge deck (2) can be fixed to each other. An angle steel (5) is provided along the longitudinal direction of the bridge deck (2) to connect adjacent bridge decks (2) into a whole. The angle steel (5) is connected to the bridge deck (2) by the fastening bolt (42).

2. The cable-stayed bridge with a hollowed-out bridge deck according to claim 1, characterized in that: The connecting buckle (41) is designed in a waist shape, which can simultaneously clamp two steel cables (1), and the two steel cables (1) are symmetrically distributed on both sides of the fastening bolt (42).

3. The cable-stayed bridge with a hollowed-out bridge deck according to claim 1, characterized in that: The bridge deck (2) includes a carriageway (23) for carrying vehicles and a pedestrian walkway (24) for carrying pedestrians. The carriageway (23) is arranged in the middle of the cable-stayed bridge along the longitudinal direction, and two rows of the pedestrian walkway (24) are arranged on both sides of the carriageway (23) along the longitudinal direction.

4. The cable-stayed bridge with a hollowed-out bridge deck according to claim 3, characterized in that: The roadway slab (23) is configured as a flat plate, and the sidewalk slab (24) is configured as a bent plate; the elevation of the roadway slab (23) is lower than the elevation of the tread surface (241) of the sidewalk slab (24).

5. The cable-stayed bridge with a hollowed-out bridge deck according to claim 3, characterized in that: The vehicle road slab (23) and the pedestrian walkway slab (24) are respectively fixed to the steel cable (1) via the connecting mechanism (4).

6. The cable-stayed bridge with a hollowed-out bridge deck according to claim 3, characterized in that: An angle steel (5) is provided at the joint of the roadway slab (23) and the sidewalk slab (24), and the angle steel (5) is connected to the roadway slab (23) and the sidewalk slab (24) respectively to form a whole.

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