JP2003082613A - Vibration and noise reduction structure of bridge structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the vibration and noise reduction structure of a bridge structure capable of reducing the vibrations and noises of a bridge with the webs of a corrugated steel plate and capable of being executed even to the bridge with the webs of the corrugated steel plate in service. SOLUTION: In the bridge with the corrugated steel plate 3 in which crest sections and bottom sections are formed alternately in the bridge axial direction, viscoelastic resin layers are formed to the external surfaces of the crest sections and bottom sections of the steel plate, and a fixed plate 12 having a shape corresponding to the shapes of the crest sections and the bottom sections is bonded on the surfaces of the viscoelastic resin layers. The viscoelastic resin layers are formed intermittently or partially to the crest sections and the bottom sections in the bridge axial direction of the steel plate 3 or either one of them, and the fixed plate 12 is bonded on their surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration / noise reduction structure for a bridge structure.

[0002]

2. Description of the Related Art Recently, due to an increase in traffic volume and deregulation of the weight of large vehicles passing through the bridge, vibration and noise of the bridge have become a problem. Even in a bridge using a corrugated steel plate for the web of the main girder (hereinafter referred to as a corrugated steel plate web bridge), since steel is used for the web, problems of vibration and noise generated by passage of a vehicle are unavoidable.

In order to solve such a problem, conventionally, a sandwich steel plate in which a viscoelastic resin is sandwiched between two thin steel plates is used for a bridge web (prior art 1), or a ferromagnetic material. A damping alloy such as a die, composite, or transition type was used (prior art 2).

[0004]

When a corrugated steel plate is used for the main girder web, it is necessary to bend the steel plate to form a corrugated plate. However, in the prior art 1, when the sandwich steel plate is bent, the steel plate is bent. Problems such as misalignment of the ends, peeling of the resin, or seagull deformation may occur.
Further, the corrugated web portion is usually joined by welding the upper and lower end portions to the upper and lower steel flanges, but during welding, there is a risk that the resin inside will burn and cause welding defects.

Further, the damping alloy of the prior art 2 includes ferromagnetic type, composite type and transition type as mentioned above. In any type, the damping performance, strength and low temperature toughness are traded off. It has been pointed out that there are problems in these points when used as a structural member of a bridge.

The present invention has been made in order to solve the above problems, and is easy to manufacture and can reduce the vibration and noise of a bridge having corrugated steel plates, and can be applied to bridges having corrugated steel plates in service. Vibration of bridge structures that can be implemented
The purpose is to provide a noise reduction structure.

[0007]

A structure for reducing vibration and noise of a bridge structure according to the present invention is a bridge having a web made of corrugated steel plate in which peaks and valleys are alternately provided in a bridge axis direction. A viscoelastic resin layer is formed on the outer surfaces of the peaks and valleys of a corrugated steel sheet, and a fixing plate having a shape corresponding to the shapes of the peaks and valleys is bonded to the surface of the viscoelastic resin layer.

Further, a viscoelastic resin layer is intermittently or partially formed on a peak portion and / or a trough portion in the bridge axis direction of the above corrugated steel sheet, and a fixing plate is bonded to the surface thereof.

[0009]

1 is a perspective view showing an embodiment of a bridge structure according to the present invention. In the figure, 1a,
1b is composed of upper and lower steel flanges 2a and 2b, and a corrugated steel plate 3 having upper and lower end portions joined to the steel flanges 2a and 2b,
A pair of corrugated steel plate web girders (hereinafter referred to as main girders) is installed on the lower floor slab 15, and 16 is an upper floor slab provided on the main girders 1a and 1b.

Main girders 1a, 1b (in the following description, main girder 1
a and 1b are sometimes referred to as 1) Corrugated steel plate 3 constituting
As shown in FIGS. 2 and 3, the peaks 5 and the valleys 6 are alternately provided via the common inclined portion 7, and the upper and lower ends thereof are joined to the steel flanges 2a and 2b by welding. The viscoelastic resin 10 is adhered to the outer surfaces of the ridges 5 and the valleys 6 including the ridges 7, and the fixing plates 12 are respectively adhered thereon. Hereinafter, these will be described in detail.

As shown in FIG. 4, the corrugated steel plate 3 has, for example, a plate thickness of about 9 to 10 mm, and is formed by bending a steel plate having a width (height) corresponding to the web of the main girder 1 to form a flat top and The ridge 5 having a trapezoidal cross section formed by the sloping portion 7 shared with the valley 6 and the sloping portion 7 shared with the flat bottom and the ridge 5.
The peaks 5 and the valleys 6 having the same shape are alternately provided.

The viscoelastic resin 10 (which may be referred to as the viscoelastic resin layer 10 in the following description) converts vibration energy into heat energy when shear deformation occurs due to the vibration of the bridge, and a vibration damping effect. What has the performance which can obtain is used.

The fixed plate 12 is a thin steel plate, an FRP plate,
As shown in FIG. 3, a CFRP plate or a fiber reinforced sheet cured with a curable resin is used, and as shown in FIG. 3, a sloped portion reaching the bottom of the valley portion 6 or the vicinity of the top of the mountain portion 5 on both sides. Is provided, and the inner surface side thereof is configured in a trapezoidal shape corresponding to the outer surface shapes of the crests 5 and the valleys 6 including the inclined portions 7 of the corrugated steel sheet 3, and the length thereof is the height of the corrugated steel sheet 3. It is formed slightly shorter than (width). Note that the fixing plate 12 needs to have rigidity enough to induce relative deformation with the corrugated steel plate 3 when vibration occurs in the bridge structure and induce shear deformation in the viscoelastic resin 10.

Next, an example of a manufacturing procedure of the vibration / noise reduction structure configured as described above will be described. First, as shown in FIG. 5, with respect to the main girder 1 manufactured in a factory or the like, an adhesive such as a room temperature curable resin is attached to the outer surfaces of the ridges 5 and the valleys 6 including the inclined portions 7 of the corrugated steel plate 3. 11 is applied and the viscoelastic resin 10 is adhered thereon. In this case, a primer as a pretreatment may be applied to the surface of the corrugated steel sheet 3 if necessary. Then, an adhesive 11 similar to the above is applied on it.
Is applied, and the fixing plate 12 is pressure-bonded and joined.

In this way, the fixing plate 12 is provided with the viscoelastic resin layer 10 in between, and the peak portion 5 and the valley portion 6 including the inclined portion 7 are formed.
Since they are installed alternately, the fixed plate 12 is a corrugated steel plate 3
Does not impede the structural feature (accordion effect) of expansion and contraction in the bridge axis direction. In this case, it is desirable that the upper and lower ends of the fixed plate 12 are not in contact with the upper and lower steel flanges 2a and 2b and are in a non-contact state.

Next, the operation of the present invention will be described with reference to FIG. FIG. 6A shows a state before vibration and noise are generated in the corrugated steel web bridge, and FIG. 6B shows a state when vibration and noise are generated. When vibration and noise occur in the bridge having the corrugated steel plate 3, the corrugated steel plate 3 of the main girder 1 is subjected to the accordion effect as shown in FIG.
It vibrates and deforms so that it opens and closes.

In the present invention, the viscoelastic resin layers 10 are alternately provided on the outer surfaces of the peaks 5 and the valleys 6 of the corrugated steel plate 3,
Since the fixing plate 12 is adhered so as to wrap the outer surface thereof, when the bridge vibrates, relative deformation occurs between the corrugated steel plate 3 and the fixing plate 12, and as a result, as shown in FIG.
As indicated by reference numeral 13 in (b), the viscoelastic resin layer 10 is sheared and deformed, and the vibration energy is converted into heat energy.
It is possible to obtain a vibration damping effect and a noise reduction effect, and it is possible to reduce the vibration and noise generated by the passage of a vehicle. Although FIG. 6 shows the action of the crests 5, the action of the troughs 6 is exactly the same as that of the crests 5.

In the above description, the case of manufacturing the main girder 1 provided with the corrugated steel plate 3, the viscoelastic resin layer 10 and the fixing plate 12 according to the present invention in a factory or the like has been described, but it is in the field or in service. The viscous resin layer 10 may be formed on the web of the corrugated steel plate 3 of the bridge by the above-described procedure, and the fixing plate 12 may be bonded thereto.

Further, in the above description, the corrugated steel plate 3 in which the peaks 5 and the valleys 6 having a trapezoidal cross section are alternately formed, and the peaks 5 are formed.
The case where the fixing plate 12 having an inner surface shape corresponding to the outer surface shape of the valley portion 6 is used is shown, but the present invention is not limited to this. The cross-sectional shapes of the peaks and valleys and the shape of the inner surface-shaped fixing plate corresponding to the peaks and valleys can be appropriately changed by, for example, alternately forming.

Further, in the above description, the peak portion 5 is provided over the entire length of the corrugated steel plate 3 forming the web of the main girder 1 in the bridge axis direction.
Although the viscoelastic resin layers 10 are alternately formed on the and troughs 6 and the fixing plate 12 is adhered and fixed thereon, the peaks 5 or the troughs 6 or intermittently or partially depending on the situation. The viscoelastic resin layer 10 may be formed on both of them, and the fixing plate 12 may be bonded thereon.

[0021]

The structure for reducing vibration and noise of a bridge structure according to claim 1 is a bridge having a web of corrugated steel plates in which peaks and troughs are alternately provided in the bridge axis direction. Since a viscoelastic resin layer is formed on the outer surface of the trough and the trough, and a fixing plate with a shape corresponding to the shape of the peak and trough is adhered and fixed to the surface of this viscoelastic resin layer, when vibration occurs on the bridge The viscoelastic resin is sheared and the vibration energy is converted into heat energy, and a vibration damping effect and a noise reduction effect are obtained, whereby vibration and noise generated by passage of a vehicle can be reduced. Further, since the present invention can be carried out in a form of being added to a bridge provided with a general corrugated steel plate, it can be carried out not only on a newly constructed bridge but also on a corrugated steel plate forming a web of a bridge in service. it can.

In a vibration / noise reduction structure for a bridge structure according to a second aspect of the present invention, a viscoelastic resin layer is intermittently or partially formed on a corrugated steel plate in a peak portion and / or a trough portion in the bridge axis direction, Since the fixing plate is adhered to the surface, the fixing plate can be concentrated on the place where the vibration or noise is generated, whereby the same effect as in the case of claim 1 can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a bridge structure according to the present invention.

FIG. 2 is a front view of a main girder portion of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view of a corrugated steel plate.

FIG. 5 is an explanatory diagram of an example of a manufacturing procedure of the vibration / noise reduction structure according to the present invention.

FIG. 6 is an operation explanatory view of a web made of a corrugated steel sheet according to the present invention.

[Explanation of symbols]

1a, 1b main girder 2a, 2b Steel flange 3 corrugated steel sheet 5 Yamabe 6 Tanibe 7 Inclined part 10 Viscoelastic resin (layer) 12 Fixed plate

Claims (2)

[Claims] 1. A bridge having a web of corrugated steel plates having peaks and troughs alternately provided in the bridge axis direction, wherein a viscoelastic resin layer is formed on the outer surface of the peaks and troughs of the corrugated steel plate. A vibration / noise reduction structure for a bridge structure, wherein a fixing plate having a shape corresponding to the shape of the peaks and valleys is bonded to the surface of the viscoelastic resin layer. 2. A viscoelastic resin layer is intermittently or partially formed on a peak portion and / or a valley portion of a corrugated steel sheet in the bridge axis direction, and a fixing plate is bonded to the surface thereof. A vibration / noise reduction structure for a bridge structure according to Item 1.