CN203393599U - Damping device for large-span laminated cable-stayed footbridges - Google Patents

Abstract

The utility model discloses a vibration damping device for a large-span laminated pedestrian cable-stayed bridge. A set of vertical link assemblies vertically connecting the upper main beam and the lower main beam, a set of horizontal link assemblies horizontally connecting the upper main beam and the lower main beam, and a set of obliquely connecting the upper main beam and the lower main beam Chain link assembly, this long-span laminated pedestrian cable-stayed bridge vibration damping device sets a vertical link assembly, a horizontal link assembly and an oblique link assembly between the upper main girder and the lower main girder, so as not to affect the double Under the premise of the shape of the double-span cable-stayed bridge, the overall structural stiffness of the double-deck cable-stayed bridge is increased, thereby effectively improving the dynamic performance of the pedestrian bridge, and better solving the problem of human-induced vibration of the long-span pedestrian bridge. The method saves engineering cost, and the utility model is used in the technical field of bridge engineering.

Description

Vibration reduction device for long-span laminated pedestrian cable-stayed bridge

technical field

    The utility model relates to the technical field of bridge engineering, in particular to a vibration damping device for large-span and super-long-span pedestrian bridges.

Background technique

In recent years, the shaking of many newly-built pedestrian bridges when crowds are dense has aroused widespread concern about the human-induced vibration of long-span pedestrian bridges. When there are many pedestrians, there must be some people whose step frequency is very close to produce a synchronous effect. When this synchronous frequency is close to a certain order natural frequency of the bridge, the resonance phenomenon of the pedestrian bridge will occur. When this phenomenon occurs, more people will naturally adjust their steps to match the vibration frequency of the bridge, which will further aggravate the resonance of the bridge.

In the prior art, dampers are usually used to improve the problem of human-induced vibration of long-span footbridges, but the structure of the damper is complicated, installation and subsequent maintenance are not easy, and the cost is high; And the beam support method to enhance the vertical stiffness of the beam, but the choice of span size is often limited by objective conditions.

Utility model content

The technical problem to be solved by the utility model is to provide a vibration damping device for a large-span laminated pedestrian cable-stayed bridge with a simple structure and low cost.

The technical solution adopted to solve the above technical problems: a vibration damping device for a long-span laminated pedestrian cable-stayed bridge, including three A set of chain link assemblies, three sets of link assemblies include a set of vertical link assemblies vertically connecting the main girder of the upper pedestrian bridge and the main girder of the lower vehicle bridge, and a set of vertical link assemblies connecting the main beam of the upper pedestrian bridge and the main beam of the lower vehicle bridge horizontally The horizontal chain link assembly, and a group of oblique chain link assemblies obliquely connecting the main girder of the upper pedestrian bridge and the main girder of the lower vehicular bridge.

As a further improvement of the technical solution of the present utility model, each group of chain rod components includes a steel pipe and a cable installed in the steel pipe, and the two ends of the steel pipe are respectively provided with a bridge against the main girder of the upper pedestrian bridge and the main girder of the lower vehicular bridge. The rubber bearing of the cable is tensioned and the two ends are respectively anchored on the main girder of the upper pedestrian bridge and the main girder of the lower vehicular bridge.

As a further improvement of the technical solution of the utility model, the cable includes a galvanized steel wire, an anti-corrosion grease layer on the outside of the galvanized steel wire, and a polyurethane waterproof layer, an inner layer of HDPE, and an outer layer of HDPE sequentially set outside the anti-corrosion grease layer.

As a further improvement of the technical solution of the utility model, the main girder of the pedestrian bridge on the upper floor is made of continuous steel box girders, and the main girder of the vehicle bridge on the lower floor is made of concrete box girders.

Beneficial effects: the large-span laminated pedestrian cable-stayed bridge vibration damping device arranges a vertical link assembly, a horizontal link assembly and an oblique link assembly between the main girder of the upper pedestrian bridge and the main girder of the lower vehicle bridge. Under the premise of not affecting the shape of the double-deck cable-stayed bridge as far as possible, the overall structural stiffness of the double-deck cable-stayed bridge is increased, thereby effectively improving the dynamic performance of the pedestrian bridge, and better solving the problem of human-induced vibration of the long-span pedestrian bridge. Compared with other vibration reduction methods, it saves engineering cost.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further;

Fig. 1 is the side view of using the laminated pedestrian cable-stayed bridge of the present utility model;

Fig. 2 is the top view of using the laminated pedestrian cable-stayed bridge of the present utility model;

Fig. 3 is a schematic diagram of the vertical link assembly in the embodiment of the present invention;

Fig. 4 is a schematic diagram of the transverse link assembly in the embodiment of the present invention;

Fig. 5 is a schematic diagram of the oblique link assembly in the embodiment of the present invention;

Fig. 6 is a cross-sectional schematic view of the cable in the embodiment of the utility model.

Detailed ways

Referring to Fig. 1 to Fig. 6, the vibration damping device of the large-span laminated pedestrian cable-stayed bridge of the present invention includes three groups of three groups arranged between the main girder 10 of the upper pedestrian bridge and the main girder 20 of the lower vehicular bridge in an S-shaped arch. Chain bar assembly 40, three groups of chain bar assemblies 40 include a group of vertical chain bar assemblies that vertically connect the main girder 10 of the upper pedestrian bridge and the main beam 20 of the lower floor vehicle bridge, and a group of vertical link assemblies that connect the main girder 10 of the upper pedestrian bridge and the lower floor vehicle bridge horizontally. The horizontal link assembly of the main beam 20 of the pedestrian bridge, and a set of oblique link assemblies obliquely connecting the main beam 10 of the upper pedestrian bridge and the main beam 20 of the lower vehicle bridge.

This large-span laminated pedestrian cable-stayed bridge damping device is provided with a vertical link assembly, a transverse link assembly and an oblique link assembly between the main girder 10 of the upper floor pedestrian bridge and the main beam 20 of the lower floor vehicle bridge. Under the premise of not affecting the shape of the double-deck cable-stayed bridge, the overall structural stiffness of the double-deck cable-stayed bridge is increased, thereby effectively improving the dynamic performance of the pedestrian bridge formed by the main girder 10 of the upper pedestrian bridge, and better solving the problem of large-span pedestrian bridges. Human-induced vibration problems, but also save engineering costs compared with other vibration reduction methods.

As a preferred embodiment of the present utility model, each group of chain bar assemblies 40 includes a steel pipe 41 and a stay cable 42 located in the steel pipe 41, and two ends of the steel pipe 41 are respectively provided with a bridge against the main girder 10 of the upper pedestrian bridge and the lower floor vehicle. The rubber support 43 on the main girder 20 of the pedestrian bridge is tensioned and the two ends of the cable 42 are respectively anchored on the main girder 10 of the upper pedestrian bridge and the main girder 20 of the lower vehicular bridge.

As a preferred embodiment of the present utility model, the dragline 42 includes a galvanized steel wire 421, an anti-corrosion grease layer 422 located on the outside of the galvanized steel wire 421, and a polyurethane waterproof layer 423, an inner layer HDPE424, Outer HDPE425.

In this embodiment, the long-span double-deck cable-stayed bridge is a three-span double-deck cable-stayed bridge, and the main girder 20 of the vehicle bridge on the lower floor adopts a concrete box girder to form a vehicle bridge. 400 meters, the main girder 10 of the upper pedestrian bridge adopts 7-span continuous steel box girders to form an S-shaped pedestrian bridge, and its straight-line span is 45+45+100+200+100+45+45 meters. , the middle tower column and the lower tower column are reinforced concrete structures, and the stay cables connected by the main girder 10 of the upper pedestrian bridge and the bridge tower 50 are arranged in a fan-shaped single cable plane on the facade, and the cable plane is arranged on the main beam 10 of the upper pedestrian bridge. On the inner side of the curve of the pedestrian bridge formed, 8 pairs of stay cables are arranged on each cable plane, and a total of 32 stay cables are arranged. Arranged in a fan shape, the cable surface is arranged in the center of the section of the vehicle bridge formed by the main girder 20 of the lower layer of the vehicle bridge. Each cable surface is arranged with 13 pairs of stay cables, and a total of 52 stay cables are arranged. The vertical link assembly is set at the corresponding position of the mid-span pedestrian bridge and the vehicle bridge, about 30 meters from the left and right of the mid-span. The pedestrian bridge is arched, and the side-span pedestrian bridge and the vehicle bridge are at the same height The horizontal link assembly is installed horizontally at the middle span, and the oblique link assembly is installed between the pedestrian bridge and the vehicle bridge at about 57 meters in the middle of the middle span. The three sets of link assemblies 40 are the vertical link assembly, the horizontal link The rod assembly and the oblique chain rod assembly have the same structure, and are mainly composed of steel pipes 41 and cables 42. According to the actual construction plan, they are distributed between the main girder 10 of the upper pedestrian bridge and the main girder 20 of the lower vehicular bridge. Tensioning applies prestress so that the steel pipe 41 is always in the two-force rod of the compressed state, so that the main girder 10 of the upper pedestrian bridge and the main girder 20 of the lower deck of the vehicle bridge are tightly connected as a whole, increasing the external restraint of the long-span pedestrian bridge and improving Girder body stiffness of a footbridge.

Setting the anti-corrosion grease layer 422 and polyurethane waterproof layer 423 outside the galvanized steel wire 421 can improve the anti-corrosion and corrosion resistance performance of the galvanized steel wire 421 .

As a preferred embodiment of the present invention, the main girder 10 of the upper pedestrian bridge is composed of a continuous steel box girder, and the main girder 20 of the lower vehicular bridge is composed of a concrete box girder.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments. Various changes are made.

Claims (4)

1. A vibration damping device for a large-span laminated pedestrian cable-stayed bridge, characterized in that: it includes an S-shaped arched upper pedestrian bridge girder (10) and a lower vehicle bridge girder (20). Three sets of link assemblies (40), the three sets of link assemblies (40) include a set of vertical link assemblies vertically connecting the main girder (10) of the upper pedestrian bridge and the main girder (20) of the lower floor bridge , a set of horizontal link assemblies horizontally connecting the main girder (10) of the upper pedestrian bridge and the main girder (20) of the lower vehicle bridge, and a set of horizontal link assemblies connecting the main beam (10) of the upper pedestrian bridge and the lower vehicle bridge The inclined link assembly of the bridge girder (20). 2. The vibration damping device for a long-span laminated pedestrian cable-stayed bridge according to claim 1, characterized in that: each group of said chain rod components (40) includes a steel pipe (41) and a steel pipe (41) The two ends of the steel pipe (41) are respectively provided with rubber bearings (43) against the main girder (10) of the upper pedestrian bridge and the main girder (20) of the lower vehicular bridge. The stay cable (42) is tensioned and its two ends are respectively anchored to the main girder (10) of the upper pedestrian bridge and the main girder (20) of the lower vehicular bridge. 3. The vibration damping device for a long-span laminated pedestrian cable-stayed bridge according to claim 2, characterized in that: the cable (42) includes a galvanized steel wire (421), and is arranged on the galvanized steel wire (421) The outer anti-corrosion grease layer (422), and the polyurethane waterproof layer (423), the inner layer HDPE (424), and the outer layer HDPE (425) are sequentially set outside the anti-corrosion grease layer (422). 4. The vibration damping device for a long-span laminated pedestrian cable-stayed bridge according to claim 1, 2 or 3, characterized in that: the main girder (10) of the upper pedestrian bridge is composed of a continuous steel box girder, and the lower vehicle The main girder (20) of the traveling bridge is made of a concrete box girder.

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