JP4733928B2 - Windbreak fence - Google Patents

Description

  The present invention relates to a windbreak fence that is installed on a side portion of, for example, a road bridge or a railway bridge, and that reduces wind blown into a road or a railroad track.

For example, windbreak fences are provided at places that are easily exposed to strong winds such as road bridges and railway bridges in order to ensure the safety of passing trains and vehicles. Examples of such a windbreak fence include a wire mesh panel as described in Patent Document 1 and a wind guide plate that guides the wind flow upward as described in Patent Document 2. Etc. are known.
JP-A-5-71107 JP 2000-345518 A

  In the windbreak fence made of wire mesh panel described in Patent Document 1, the windbreak performance is improved as the shielding ratio is increased, but the wind load applied to the windbreak fence is increased. And if the wind load applied to a windbreak fence increases, it will be necessary to comprise a fence with a highly rigid member, or to fix with high intensity | strength, and installation cost will increase. In addition, when a windbreak fence is attached to a bridge, it is necessary to consider the influence on bridge girders and piers because the force applied to the bridge increases as the wind load increases. As described above, in the windbreak fence made of wire mesh panel, if the shielding ratio is increased to increase the windproof performance, there is a problem due to the increase of the wind load, so the windproof performance is improved and the wind load is reduced. It is difficult to achieve both.

  Moreover, in the windbreak fence provided with the flow guide plate described in Patent Document 2, the flow guide plate must be attached obliquely at a predetermined angle in order to appropriately change the direction of the wind. This complicates the structure and increases the cost.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a windbreak fence that can achieve both an excellent windbreak performance and a reduction in wind load with a simple configuration.

In order to achieve the above object, the present invention is a windbreak fence for reducing the passing wind, and includes at least two columnar rows in which a plurality of columnar bodies are arranged at intervals, and each columnar row is provided. the column body is shifted a columnar body and the position of the tubular elements of the next so as to overlap the cylindrical body partially next to the tubular elements when viewed the windbreak fence from the front, the interval of the columnar body of the tubular elements Is arranged so as to form an oblique path toward the interval between the columns of the adjacent column row, and the wind is reduced by changing the direction of the wind passing through the windbreak fence and canceling the backward component It is characterized by making it.

According to the present invention, the column body of each column row is displaced from the column body of the next column row so as to partially overlap the column of the next column row when the windbreak fence is viewed from the front , Since it is arranged to form an oblique path from the interval between the columns in each column row to the interval between the columns in the next column row, the wind hitting the windbreak fence is in the process of passing between the columns. The wind direction in a plane perpendicular to the column changes irregularly. For this reason, the wind after passing a windbreak fence has a component of the reverse direction in the said plane, and a wind is reduced because they cancel each other. As described above, in the present invention, since the wind is reduced by changing the direction of the wind passing through the windbreak fence and canceling out the reverse component, the windbreak is reduced as compared with the case where the wind is reduced only by blocking the wind. An excellent windproof effect can be obtained while suppressing the wind load applied to the fence. Such performance can be obtained with a simple configuration in which columns are arranged.

  In this windbreak fence, the column may be configured by arranging the vertically oriented columns in the horizontal direction, or may be configured by arranging the horizontally oriented columns in the vertical direction. Good.

  In addition, when a cylindrical body is employed as the column body, a high Reynolds number is obtained particularly at a high wind speed, and the efficacy coefficient is lowered, so that the wind load applied to the windbreak fence can be further reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the windbreak fence which can make the outstanding windproof performance and reduction of a wind load compatible by simple structure can be provided.

  FIG. 1 is a perspective view of a bridge 1 such as a road bridge or a railway bridge provided with a windbreak fence 10 according to an embodiment of the present invention. As shown in the figure, the windbreak fence 10 is provided along both sides of the bridge 1, and by reducing the wind blown from the outside of the bridge 1 to the roads and tracks, the safety of vehicles and trains passing through the bridge 1 is reduced. It has a role to ensure sex.

  FIG. 2 is an enlarged perspective view showing the windbreak fence 10. As shown in the figure, the windbreak fence 10 is composed of a large number of columns 12 arranged in two rows and support plates 13 that respectively support the upper and lower bottom surfaces of these columns 12. Note that the column body 12 and the support plate 13 are made of reinforced resin such as aluminum, steel, FRP, or other appropriate material.

  FIG. 3 is a plan view showing the arrangement of the pillars 12 and also shows the flow of wind passing through the windbreak fence 10. Note that the right side in FIG. 3 corresponds to the inside of the bridge 1 (on the road or track side). As shown in the figure, a plurality of column bodies 12A and 12B are arranged at substantially equal intervals with intervals 16A and 16B, respectively, to form column rows 14A and 14B, and one (left side in the figure) column row Each column body 12A of 14A and each column body 12B of the other column row 14B (right side in the figure) are staggered (that is, the position of the column body 12A and the position of the column body 12B are shifted from each other). ) Arrange. For this reason, when a rightward wind blows from the outside of the bridge 1 (left side in FIG. 3) as indicated by an arrow A in the same figure, this wind flows from the interval 16A of the first column 12A to the second row. It passes through an oblique path toward the interval 16B of the column 12B. As a result, as indicated by an arrow B in FIG. 3, the wind that has passed through the windbreak fence 10 changes its direction up and down in the figure and blows out from the interval 16B of the columnar bodies 12B. Accordingly, the components in the direction parallel to the windbreak fence 10 (vertical direction in FIG. 3) cancel each other out, and the component in the direction perpendicular to the windbreak fence 10 (rightward in the figure) is It is reduced by the inclination angle of the wind direction. Therefore, the wind that has passed through the windbreak fence 10 is reduced by an amount corresponding to the horizontal component offset as described above.

  As described above, according to the windbreak fence 10 of the present embodiment, the wind direction component is generated in the horizontal direction by changing the wind direction with the two columns 12 (12A, 12B) arranged in a staggered manner. By canceling each other out, it is possible to reduce the wind that passes through the windbreak fence 10 and blows into the road or track. That is, the wind is not blocked by the windbreak fence 10, but is reduced by changing the direction of the wind and canceling, so that an excellent windbreak effect can be obtained while suppressing the wind load applied to the windbreak fence 10. Therefore, according to the windbreak fence 10 of this embodiment, by suppressing the wind load, rigidity and fixing strength required for the windbreak fence 10 can be reduced, and the influence of the wind load on the frame structure and the pier of the bridge 1. Can also be reduced.

  In addition, since the windbreak fence 10 has a simple configuration in which a plurality of column bodies 12 are arranged and supported in the vertical direction, the cost can be reduced, and the appearance can be improved with a simple appearance.

  Furthermore, in this embodiment, by using a cylindrical body as the column 12, the Reynolds number is increased particularly at a high wind speed, and the drag coefficient is decreased. Thereby, the wind load which acts on the windbreak fence 10 can be reduced further. However, in the present invention, the shape of the column is not limited to a cylinder, and may be an elliptical column or a polygonal column such as a rectangle / triangle.

  FIG. 4 is a perspective view of a windbreak fence 100 which is another embodiment of the present invention. As shown in the figure, in the present embodiment, horizontal column bodies 112 are arranged vertically and connected by support plates 113 on both sides. In this embodiment, the vertical cross-section of the windbreak fence 100 has the configuration shown in FIG. 3, and the vertical components of the wind that has passed through the windbreak fence 100 cancel each other, thereby reducing the wind.

  In the embodiments shown in the drawings, the column bodies 12 and 112 are regularly arranged at regular intervals. However, the present invention is not limited to this, and the column bodies are arranged at irregular intervals. May be. In short, the configuration in which the positions of the first and second column columns are shifted so that the wind that has passed through the first column column changes direction when passing through the second column column interval. If it is.

  Moreover, in each said embodiment, although the column bodies 12 and 112 were arrange | positioned in 2 rows, not only this but the column body of 3 or more rows will shift | deviate a position with the column body of the row | line | column to which the column body of each row adjoins. It is good also as a structure arranged in this way.

It is a perspective view of the bridge where the windbreak fence which is one Embodiment of this invention was installed. It is a perspective view of the windbreak fence of this embodiment. It is a top view which shows arrangement | positioning of the column of the windbreak fence of this embodiment. It is a perspective view which shows another embodiment of the windbreak fence of this invention.

Explanation of symbols

10,100 Windbreak fence 12,12A, 12B, 112 Column body 13,113 Support plate 14A, 14B Column row 16A, 16B Interval

Claims (4)

A windbreak fence for reducing the passing wind, comprising at least two columnar rows in which a plurality of columnar bodies are arranged at intervals from each other, and the columnar bodies of each columnar row are viewed from the front. and by shifting the cylindrical body and the position of the columnar body and partially overlapping adjacent pillar column as next to the tubular elements when, from the interval of the columnar body of the tubular elements, the spacing of the pillars of the next tubular elements A windbreak fence which is arranged so as to form an oblique path toward the windbreak and reduces the wind by changing the direction of the wind passing through the windbreak fence and canceling out the reverse component .   The windbreak fence according to claim 1, wherein the column of columns is configured by vertically arranging the column bodies in a horizontal direction.   The windbreak fence according to claim 1, wherein the column of columns is configured by arranging the column bodies horizontally oriented in a vertical direction.   The windbreak fence according to any one of claims 1 to 3, wherein the column body is a cylindrical body.

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