JP6065566B2 - Sound insulation for road bridges - Google Patents

Description

  The present invention relates to a sound insulation member for a road bridge.

For elevated roads and bridges (hereinafter referred to as road bridges), in order to absorb the expansion and contraction of the floor slabs due to temperature changes, etc., the expansion device for road bridges is used between the slabs and between the slabs and the abutments. Connect through.
For this reason, there is a problem in that noise generated when a vehicle traveling on a road bridge passes through the expansion device for the road bridge propagates downward in the above gap and spreads, and causes noise damage to the surrounding residents.
Therefore, below the expansion device for the road bridge, the plate-like foam is moved up and down between the gaps between the opposite end faces of the two main girders or between the end faces of the opposite main girders and the end face of the abutment. Noise is shielded by providing a sound insulation member for road bridges laminated in a direction (see Patent Document 1).

JP 2009-293248 A

However, in the above prior art, since the sound insulation member for road bridges is composed only of the foam, it is necessary to increase the thickness of the foam in order to improve the sound insulation effect. There is a disadvantage that the material cost increases as the value increases.
This invention is made | formed in view of such a situation, and it aims at providing the sound insulation member for road bridges advantageous in aiming at the improvement of the sound insulation effect, aiming at cost reduction.

  In order to achieve the above-mentioned object, the present invention is for a road bridge disposed between a gap between two end faces of two main girders facing each other or between a face face of the opposite main girders and an end face of an abutment. A sound insulating member, which is an elastically deformable plate-like sound absorbing layer having a thickness, width, and length, and a portion attached to both ends in the width direction of the sound absorbing layer and separated in the thickness direction of the sound absorbing layer. An acoustically deformable cylindrical sound insulation layer that wraps around the sound absorption layer, the sound insulation layer being attached to both ends in the width direction of the sound absorption layer with the thickness direction of the sound absorption layer being directed vertically The layer portion is elastically contacted with each of the end faces, and is disposed between the play. In the state of being disposed between the play, the sound absorbing layer is disposed between the upper surface of the sound absorbing layer and a portion of the sound insulating layer positioned above the upper surface. An air layer is formed between the lower surface of the layer and the portion of the sound insulating layer located below the lower surface. Characterized in that it is made.

According to the present invention, between the upper surface of the sound absorbing layer and the portion of the sound insulating layer positioned above the upper surface and between the lower surface of the sound absorbing layer and the portion of the sound insulating layer positioned below the lower surface. An air layer is formed.
Therefore, in addition to the sound insulation effect by the upper and lower sound insulation layers and the sound absorption effect by the sound absorption layer, it is advantageous to improve the sound insulation effect by ensuring a large space between the upper and lower sound insulation layers by the air layer. Moreover, since it is not necessary to increase the thickness of the foam in order to improve the sound insulation effect unlike the prior art, it is advantageous in reducing the cost.

It is sectional drawing which shows the example which installed the sound insulation member 10 for road bridges in embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the road bridge 2 is configured by arranging a large number of main girders 4 supported by piers in the bridge axis direction, and a floor slab 6 constituting a road surface is formed on the main girders 4. Is provided.
A conventionally known road that absorbs expansion and contraction of the floor slab 6 between the gap between the end faces 6A of the opposing floor slab 6 or between the end face 6A of the opposite floor slab 6 and the end face (wall surface) of the abutment. A bridge extension device 8 is installed.
The road bridge telescopic device 8 is configured by combining members such as rubber and iron plate, and impact noise is generated when the vehicle passes through this portion.

The sound insulation member 10 for road bridges is disposed in the gap 5 between the end faces 4A of the two main girders 4 facing each other, and insulates the impact noise when passing through the road bridge telescopic device 8.
The sound insulation member 10 for a road bridge according to the present embodiment includes a sound absorption layer 12 and a sound insulation layer 14.

  The sound absorbing layer 12 has a uniform thickness and a uniform width, and has a plate shape having a length corresponding to the length of the end face 4A of the main girder 4 in the direction orthogonal to the bridge axis direction.

The sound insulation layer 14 has a cylindrical shape, is attached to both ends 1202 in the width direction of the sound absorption layer 12, and wraps the sound absorption layer 12 through portions separated in the thickness direction of the sound absorption layer 12. It has a length corresponding to the length in the direction orthogonal to the bridge axis direction of 4A. Therefore, in the sound insulation member 10 for road bridges, the sound absorption layer 12 and the sound insulation layer 14 are integrally formed.
The sound insulation layer 14 is formed of a material that can be elastically deformed and has excellent sound insulation performance.
As a material constituting the sound insulation layer 14, for example, a rubber sheet formed of chloroprene rubber can be used.
Even if the rubber sheet is a cloth-filled rubber sheet or a rubber sheet that does not contain cloth, the sound insulation performance does not change. However, if a cloth-filled rubber sheet is used for the sound insulation layer 14, durability and strength can be secured. It will be advantageous.
The thickness of the sound insulation layer 14 is, for example, about 2 to 3 mm.

The sound absorbing layer 12 is formed of a material that is elastically deformable and has excellent sound absorbing performance.
As a material constituting the sound absorbing layer 12, for example, a foam such as urethane foam or chloroprene rubber sponge can be used.
The thickness of the sound absorbing layer 12 is, for example, 20 mm or more, but the thickness of the sound absorbing layer 12 is increased as the dimension of the gap 5 is increased, and the area of both ends 1202 in the width direction of the sound absorbing layer 12 is increased. It is preferable in order to stably elastically contact the portions of the sound insulating layer 14 attached to both ends 1202 in the width direction of the sound absorbing layer 12 and the respective end surfaces 4A.
Further, the sum of the width of the sound absorbing layer 12 and the thickness of the two sound insulating layers 14 is the dimension (width) in the bridge axis direction of the sound insulating member 10 for road bridges.
The width of the sound insulation member 10 for the road bridge is set to be equal to or greater than the maximum width of the gap 5 of the main girder 4. When the main girder 4 contracts, the road bridge sound insulation member 10 and the end face 4A of the main girder 4 It is preferable that it can be elastically contacted with no gap.

As a material constituting the sound absorbing layer 12, urethane foam is advantageous in comparison with chloroprene rubber sponge in the following points.
First, since urethane foam is softer than chloropre-rubber sponge, there is an advantage that it does not require labor for construction.
That is, since the main girder 4 expands and contracts due to the temperature change in the season, the dimension of the gap 5 in the bridge axis direction changes. For example, in the summer, the main girder 4 extends and the dimension of the gap 5 in the bridge axis direction becomes narrow. Thus, in winter, the main girder 4 contracts and the size of the clearance 5 becomes wider.
Therefore, in the summer, when the sound insulation member 10 for road bridges is inserted into the narrow gap 5, the urethane fame is easily deformed compared to the chloroprene rubber sponge, so that it does not take time and effort to construct.
Secondly, urethane foam has a lower material cost than chloroprene rubber sponge.

The sound insulation member 10 for road bridges has the sound absorption layer 12 oriented in the vertical direction and the sound insulation layer 14 portions 1402 attached to both ends 1202 in the width direction of the sound absorption layer 12 are connected to the end faces of the main beam 4. 4A is placed in play space 5 in elastic contact.
Then, in a state of being arranged in the gap 5, it is located between the upper surface 1210 of the sound absorbing layer 12 and the portion 1410 of the sound insulating layer 14 located above the upper surface 1210 and below the lower surface 1212 of the sound absorbing layer 12 and the lower surface 1212. An air layer 16 is formed between the portion 1412 and the portion 1412 of the sound insulating layer 14 to be formed.
In the present embodiment, the air layer 16 is formed both between the upper surface 1210 of the sound absorbing layer 12 and the portion 1410 of the sound insulating layer 14 and between the lower surface 1212 of the sound absorbing layer 12 and the portion 1412 of the sound insulating layer 14. Has been.
The air layer 16 has a distance from the lower surface of the portion 1410 of the sound insulating layer 14 positioned above the upper surface 1210 of the sound absorbing layer 12 to the upper surface of the portion 1412 of the sound insulating layer 14 positioned below the lower surface 1212 of the sound absorbing layer 12, for example, 230 mm. It is formed to have the above thickness.
By securing such an air layer 16, it is possible to secure a large space between the portions 1410 and 1412 of the sound insulation layer 14 located above and below the sound absorption layer 12, which is advantageous in improving sound insulation performance. .

Next, the attachment method of the sound insulation member 10 for road bridges is demonstrated.
The sound insulation member 10 for the road bridge is inserted from below the gap 5.
The sound insulating layer is attached to both ends 1202 in the width direction of the sound absorbing layer 12 so that the thickness direction of the sound absorbing layer 12 is directed vertically and the width direction of the sound absorbing layer 12 extends along the bridge axis direction. Fourteen locations 1402 are arranged in elastic contact with the end faces 4A of the main beam 4.
At this time, if a metal fitting 18 for preventing the fall is provided below the sound insulation member 10 for the road bridge, the sound insulation member 10 for the road bridge prevents the downward movement from the gap 5 and the sound insulation member 10 for the road bridge is placed in the gap 5. It is advantageous to keep the
The sound insulation member 10 for a road bridge can be stabilized by attaching the portions 1402 of the sound insulation layer 14 attached to both ends 1202 in the width direction of the sound absorbing layer 12 and the end surface 4A of the main girder 4 using an adhesive. This is advantageous for the arrangement.
This completes the attachment of the sound insulation member 10 for road bridges to the gap 5.

Next, operational effects will be described.
In the present embodiment, between the upper surface 1210 of the sound absorbing layer 12 and the portion 1410 of the sound insulating layer 14 located above the upper surface 1210 and between the lower surface 1212 of the sound absorbing layer 12 and the sound insulating layer 14 located below the lower surface 1212. An air layer 16 is formed between both portions 1412.
Therefore, as compared with the configuration in which the foam is simply laminated as in the prior art, in addition to the sound insulation effect by the portions 1410 and 1412 of the sound insulation layer 14 located above and below the sound absorption layer 12 and the sound absorption effect by the sound absorption layer 12, the air By securing a large distance between the portions 1410 and 1412 of the sound insulating layer 14 located above and below the sound absorbing layer 12 by the layer 16, it is advantageous for significantly enhancing the sound insulating effect.
Therefore, the impact noise generated when the vehicle passes through the road bridge telescopic device 8 is effectively sound-insulated, which is advantageous in reducing noise below the road bridge 2.
In addition, a sound insulation effect can be obtained without increasing the thickness of the foam as compared with the configuration consisting of only the foam as in the prior art, which is advantageous in reducing the cost.
In addition, since the sound insulation layer 12 and the sound insulation layer 14 are integrally formed in the road bridge sound insulation member 10, the road bridge sound insulation member 10 is simply inserted into the play space 5 from below the play space 5. The sound insulating member 10 can be arranged in the play 5.
Therefore, even when the width of the gap 5 is narrow and a space for an operator to enter the gap 5 cannot be ensured, the installation work of the road bridge sound insulation member 10 can be performed easily and reliably.

  In the embodiment, the air layer 16 is positioned between the upper surface 1210 of the sound absorbing layer 12 and the portion 1410 of the sound insulating layer 14 located above the upper surface 1210 and below the lower surface 1212 of the sound absorbing layer 12 and the lower surface 1212. Although the case where it forms in both between the part 1412 of the sound-insulating layer 14 to be demonstrated was demonstrated, even if the air layer 16 is formed in any one, it cannot be overemphasized that the same effect is show | played.

  4 ... main girder, 4A ... end face, 5 ... gap, 10 ... sound insulation member for road bridge, 12 ... sound absorbing layer, 1210 ... upper surface of sound absorbing layer 12, 1212 ... lower surface of sound absorbing layer 12, 14 ... sound insulation layers, 1410, 1412 ... portions of sound insulation layers 14, 16 ... air layers.

Claims (4)

A sound insulation member for a road bridge arranged between the play between two mutually facing end faces of the main girders, or between the play of the main girders facing each other and the end face of the abutment,
An elastically deformable plate-like sound absorbing layer having a thickness, width and length;
An elastically deformable cylindrical sound insulation layer that is attached to both ends in the width direction of the sound absorption layer and wraps the sound absorption layer through locations separated in the thickness direction of the sound absorption layer;
The thickness direction of the sound absorbing layer is directed in the vertical direction, and the portions of the sound insulating layer attached to both ends in the width direction of the sound absorbing layer are arranged in the play by elastic contact with the respective end faces,
Between the upper surface of the sound-absorbing layer and the portion of the sound-insulating layer located above the upper surface, and between the lower surface of the sound-absorbing layer and the portion of the sound-insulating layer located below the lower surface in the state of being arranged between the play An air layer is formed on either one of
A sound insulation member for road bridges. The air layer is formed both between an upper surface of the sound absorbing layer and a portion of the sound insulating layer located above the upper surface, and between a lower surface of the sound absorbing layer and a portion of the sound insulating layer located below the lower surface. Being
The sound insulation member for a road bridge according to claim 1. The sound insulation layer is composed of a rubber sheet,
The sound insulation member for a road bridge according to claim 1 or 2. The sound absorbing layer is made of urethane foam,
The sound insulation member for a road bridge according to any one of claims 1 to 3, wherein

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