JP4112746B2 - Vehicle protection fence with windbreak device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a windproof device for relaxing a strong crosswind blown to a traveling vehicle on the road from the outside direction of the road on a highway, an automobile exclusive road, etc. so that the vehicle can travel safely. It relates to the vehicle protection fence.
[0002]
[Prior art]
On roads and bridges that pass through strong wind zones, there are often situations where the driving safety of automobiles is impaired by the action of strong crosswinds. As such a windbreak countermeasure, conventionally, a windbreak fence is generally installed outside the vehicle protection fence.
[0003]
In addition, as a windbreak countermeasure other than the windbreak fence, for example, as in Japanese Utility Model Publication No. 45-32346, a wind composed of a curved nozzle plate and a nozzle guide plate arranged on the outer side of the upper end of the guard rail with a gap therebetween. The air flow path is installed in the direction of the outside of the road, and the air blown from the outside of the road is introduced into the suction port at the lower end of the nozzle guide plate. There is known a windproof device that changes the wind direction by blowing it out.
[0004]
[Problems to be Solved by the Invention]
Among these windproof measures, the windbreak fence blocks the strong side wind blowing against the traveling vehicle on the road from the outside direction of the road at the side of the road, so the height of the fence is at least on the ground of the traveling vehicle. As a result, the windshield fence has a problem that visibility and visibility of the vehicle driver are significantly hindered. In addition, the windbreak fence increases the wind receiving area of the fence itself, so a solid support foundation for the windbreak fence is required in addition to the protective fence, and in the case of a bridge, the wind load on the bridge body is required. Has the problem of increasing.
[0005]
On the other hand, in the windbreak device of Japanese Utility Model Publication No. 45-32346, the suction port for introducing the wind blown from the road outer side direction into the guide channel is opened only at a part of the upper end outside the guardrail. Not all the wind blown from the outside of the road toward the guardrail can be introduced into the guide channel from the suction port, but only the wind blown to the suction port part is introduced from the suction port into the guide channel. Therefore, there is a problem that the windproof efficiency is not perfect.
[0006]
Further, in the windproof device described above, the wind introduced into the guide channel from the suction port directly collides with the nozzle plate in the guide channel, and the direction of the flow is suddenly changed in the direction of the blowout nozzle at the upper end. When the wind in the guide channel whose direction of flow has been changed is forcibly pushed toward the blowout nozzle at the upper end, intense turbulence is generated in the suction port and the suction effect at the suction port is hindered. Thus, there is a problem in that the wind cannot be efficiently sucked from the suction port, and therefore, it cannot be ejected as vigorously as the air curtain is formed from the blowout nozzle at the upper end.
[0007]
Further, in the windbreak device described above, since the blowout nozzle at the upper end is provided so as to blow up in the windward direction of the wind blown from the road outer direction, the wind discharged from the blowout nozzle is the wind blown from the road outer direction. It will be pushed back to the road direction again, and there is a problem that an effective windproof effect cannot be expected to change the wind direction. In addition, since the windbreaker basically has a structure that blocks the wind blown from the outside of the road, the windbreaker must have a robust structure that can withstand wind loads and is not economical. Since it protrudes from the upper end of the guardrail, the height is inevitably increased, and the visibility and visibility of the vehicle driver are hindered.
[0008]
As a result of examining the problems of the conventional windbreaking device, as a windbreaking device provided on roads and bridges, a method of changing the wind flow by a shielding structure that directly blocks the wind has a certain effect. However, on the other hand, since it has to be a robust structure, it has the disadvantage of increasing the scale of the facility and hindering the visibility and visibility of the vehicle driver. It was found that the structure should have a resistance value as low as possible against the wind pressure.
[0009]
[Means for Solving the Problems]
In view of the problems of the conventional windproof devices as described above, the present invention blows on the side of the vehicle by rationally guiding the flow of wind rather than directly blocking or attenuating strong crosswinds. While allowing the vehicle to travel safely by allowing the wind to flow above the road that does not interfere with vehicle driving, the height can also be set within the range of the height of the conventional protective fence, and the vehicle driver's visibility, The purpose is to provide a vehicle protection fence with a windproof device that does not hinder the visibility.
[0010]
According to the first aspect of the present invention, as a specific means for that purpose, in a vehicle protection fence comprising a support column erected at intervals on the shoulder of a road and a horizontal beam installed in a plurality of stages between these support columns, At the upper end, the upper end is positioned above the inner surface of the upper horizontal beam and the lower end is positioned below the outer surface of the road. A second flow guide plate that is located above the inner surface of the road spaced apart from the upper end of the flow plate and is inclined at a larger angle than the first flow guide plate so that the lower end is positioned below the road outer surface side, and A blow-through passage is formed between the first flow guide plate and the second flow guide plate to guide the wind from the road outer surface side upward to the road inner surface side.
[0011]
According to a second aspect of the present invention, in the first aspect of the invention, a shield for closing a space formed between the upper horizontal beam and the first flow guide plate attached to the lower slope on the lower surface of the upper horizontal beam on the road outer surface side. It is characterized by having a board.
[0012]
According to a third aspect of the present invention, in the first aspect of the invention, the second flow guide plate is a plate wider than the first flow guide plate, and the upper end of the second flow guide plate is the first flow guide plate. Located at the same height as the upper end of the plate and at the upper side of the road inner surface, which is approximately the same as the upper end width of the first flow guide plate and about the upper end width of the column. It is characterized by being.
[0013]
According to a fourth aspect of the present invention, in the first or third aspect of the present invention, the inclination angle of the first flow guide plate with respect to the column is set in a range of 30 ° to 60 °, and the inclination angle of the second flow guide plate with respect to the column is 50. It is characterized in that it is provided in the range of 80 ° to 80 °.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of the vehicle protection fence with windproof device according to the present invention will be described with reference to the embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing the configuration of the vehicle protection fence with windproof device. A column 2 having a height of about 1 m that is erected at a predetermined interval, an upper horizontal beam 3 installed between the upper ends of these columns 2, and a stopper 5 on the road inner surface A on the middle upper part of the column 2 And a lower horizontal beam 6, which is also installed on a road inner surface A on the middle lower part of the column 2 via a stopper 7.
[0015]
The windbreak device provided in the protection fence includes a first flow guide plate 8 made of a metal plate such as aluminum or stainless steel or a synthetic resin plate such as acrylic, which is attached between the upper end portions of the support column 2 with a predetermined inclination angle, and a support column. It is fundamentally comprised from the 2nd flow guide plate 11 which consists of the same raw material attached so that it might incline at a larger angle than the 1st flow guide plate 8 between two intermediate parts.
[0016]
The first flow guide plate 8 provided between the upper ends of the support columns 2 has a width that is two to three times larger than the upper end width W of the support columns 2, and the upper end 8 a is the road inner surface A on the lower surface of the upper horizontal beam 3. And a fastener 9 so that the lower end 8b holds an inclination angle in the range of 30 ° to 60 °, preferably 45 ° so that the lower end 8b protrudes in the direction of the road outer surface B below the upper horizontal beam 3. It is fixed with.
[0017]
When the first flow guide plate 8 is attached to the lower side of the upper horizontal beam 3 with an inclination angle of 45 °, a triangular space is formed between the lower surface of the upper horizontal beam 3 on the road outer surface side B and the intermediate portion of the first flow guide plate 8. Since the portion C is formed, a wind is blown from the road outer surface side B by providing a shielding plate 10 between the upper horizontal beam 3 and the first flow guide plate 8 on the road outer surface side B in order to close the space portion C. Is preferably guided to the upper part of the front surface of the column 2 by the shielding plate 10 without entering the space C along the first flow guide plate 8.
[0018]
On the other hand, the second baffle plate 11 provided between the intermediate portions of the support columns 2 has a lateral width that is about three times larger than the width of the first baffle plate 8, and the upper end 11 a is the top end of the upper horizontal beam 3. And the first flow guide plate upper end 8a is located above the road inner surface side A which is separated by the upper end width W of the support column 2, and the lower end 11b is located below the road outer surface side B, specifically the first guide plate. The metal plate 12 is fixed by the stopper 12 with an inclination angle in the range of 50 ° to 80 °, preferably an inclination angle of 67.5 ° so as to protrude on the vertical line of the flow plate lower end 8b.
[0019]
As described above, by providing the first flow guide plate 8 and the second flow guide plate 11 that are inclined between the support columns 2, the road on the left side of the drawing is located between the respective flow guide plates 8 and 11. Each flow guide plate 8 having a suction port 14 for introducing the wind blown from the outer surface side B and a blowing port 15 for ejecting the wind introduced from the suction port 14 to the upper side of the road inner surface side A at the upper end. , 11 is formed along the inclined surface 13. The opening width of the suction port 14 at the lower end of the blow-through passage 13 is about five times the opening width of the blow-out port 15 at the upper end.
[0020]
On the other hand, between the lower end of the second flow guide plate 11 and the ground covering portion 16, a ventilation path 17 of about 1/7 of the height of the support column 2 is left.
[0021]
As described above, the windbreak device basically includes the first flow guide plate 8 and the second flow guide plate 11, but before describing the windproof function of the flow guide plate 8 and the flow guide plate 11. Next, the windbreak function by the first flow guide plate 8 will be described with reference to FIG.
[0022]
As shown in FIG. 4, when the cross wind D is blown from the road outer surface side B direction on the left side of the drawing to the guard fence provided with the first flow guide plate 8, in the front portion of the first flow guide plate 8, An upward deflection flow E that flows in the direction of the upper end of the column 2 along the inclined surface of the flow guide plate 8 is generated. At that time, if the shielding plate 10 is provided between the lower surface of the upper horizontal beam 3 on the road outer surface side B and the intermediate portion of the first flow guide plate 8, the first flow guide plate 8 and the shield plate 10 An obtuse corner portion is formed, and an appropriate deflected flow E that smoothly guides the wind striking the front surface of the first flow guide plate 8 to the upper side of the protective fence can be obtained.
[0023]
Further, in the portion of the lower end 8b of the first flow guide plate 8, a separation portion is generated in the flow of the cross wind D, and the first flow guide plate 8 is separated from the deflected flow E guided upward of the protective fence, and has a first direction. A flow that changes toward the back surface of the flow guide plate 8 is generated. Therefore, when only the wind hitting the surface of the first flow guide plate 8 is viewed, the deflected flow guided by the first flow guide plate 8 and the shielding plate 10 toward the road inner surface A direction above the protective fence. A wind-reducing area F1 due to negative pressure is generated in a lower part of E, and the pressure is reduced inside the air-reducing area F1 and the effect of sucking the airflow around the area is brought about.
[0024]
On the other hand, as shown in FIG. 3, when the second flow guide plate 11 is provided below the first flow guide plate 8, the suction port between the first flow guide plate 8 and the second flow guide plate 11. 14 from the blowout port 15 at the upper end of the blow-through passage 13 along the inclined surface between the two flow guide plates 8 and 11 blows out as a flow G toward the road inner surface side A above the protective fence. Is done. At this time, the cross wind entering from the suction port 14 is contracted while reaching the blowout port 15 having an opening area smaller than that of the suction port 14, and when discharged as a blow-up flow G, the flow velocity is further increased.
[0025]
Further, since this blow-up flow G is discharged toward the low-pressure wind-reduction area F1 having a low pressure generated by the airflow flowing along the first flow guide plate 8 shown in FIG. 4, the wind-reduction area shown in FIG. The speed increasing effect is further ensured by the suction action of F1. As a result, the deflection flow E induced by the first flow guide plate 8 and the shielding plate 10 in the direction of the road inner surface A above the protective fence is caused by the blow-up flow G having an increased flow velocity ejected from the blowout port 15. The air is blown further upward on the road inner surface side A, and the range of the wind reduction area F1 is expanded to the area of F2 above.
[0026]
In other words, due to the synergistic effect of the deflection flow E by the first flow guide plate 8 and the shielding plate 10 and the blow-up flow G by the second flow guide plate 11, the cross wind that attempts to blow through the top of the protective fence horizontally In the part beyond the road side, it is greatly deflected above the road inner surface side A, and the cross wind directly acting on the traveling vehicle is greatly reduced.
[0027]
In addition, since the 2nd baffle plate 11 can extend the lower end 11b to the lower part of a protection fence by enlarging an inclination angle, the wind-shielding effect can also be improved.
[0028]
As described above, it is preferable that the first flow guide plate 8 is mounted at an inclination angle of 45 °. However, the inclination angle of the first flow guide plate 8 is set to 15 °, 30 until the optimum mounting angle is determined. As shown in FIG. 5, the wind reduction rate in the wind tunnel experiment was set at 3 degrees of 45 ° and 45 °. As shown in FIG. Whereas the following areas hardly occur, at 30 °, the height is about 1.5 m behind the guard fence, and the area with a wind reduction rate of 0.4 is about 1.5 m from the guard fence to the inner surface A of the road ( The wind speed is reduced by 60%), and at 45 °, an area with a wind reduction rate of 0.4 at the same height can be generated from the protective fence to the road inner surface A up to about 4 m. It was found that the widest wind reduction area can be secured when the angle is 45 °.
[0029]
Further, the second flow guide plate 11 is preferably attached at an inclination angle of 67.5 ° as described above, but 45 °, 67.5 °, and 90 ° are required until the optimum attachment angle is determined. As a result of the experiment with the three types, the blowout port 15 that forms a contracted flow at the upper end cannot be obtained at 45 ° and is parallel to the first flow guide plate 8; It was found that the blowing effect by the flow guide plate 11 could not be obtained, and finally 67.5 ° was preferable.
[0030]
And as a result of having conducted the wind tunnel experiment about the case where the 1st baffle plate 8 is set to 45 degrees, the 2nd baffle plate 11 is set to 67.5 degrees, and the protective fence which does not provide a baffle plate at all, it shows in FIG. Thus, in the guard fence without the flow guide plate, the area of the wind reduction rate of 0.6 (wind speed is reduced by 40%) reaches only about 1.0 m from the ground surface, whereas the first flow guide plate When 8 and the second flow guide plate 11 were provided at a predetermined angle, it was found that the area of the wind reduction rate of 0.6 extends over 2 m from the ground surface.
[0031]
【The invention's effect】
As described above, according to the vehicle protection fence with windproof device of the present invention, the first and second flow guide plates having a predetermined inclination angle are provided on the protective fence. When the cross wind D is blown to the traveling vehicle on the road inner surface side A, a deflection flow E above the protective fence by the first flow guide plate and a blow-up flow G by the second flow guide plate are generated, and these Due to the synergistic effect of the airflow, the crosswind D, which tries to blow through the top of the protective fence horizontally, can be largely deflected above the road inner surface A at the part beyond the protective fence, which acts on vehicles traveling on the road. It is possible to greatly reduce the crosswind.
[0032]
In addition, the first and second flow guide plates are both provided within the height of the protective fence, and the windbreak device itself does not exceed the height of the protective fence. A windbreak function equivalent to a windbreak fence of 2m in height can be demonstrated, so the crosswind can be greatly reduced without impairing the visibility and visibility of the driver to the outside world, and a safe road that does not impair driving stability. Can be provided.
[0033]
In the windbreak device of the present invention, the crosswind is not blocked like the conventional windbreak fence, but is largely deflected above the road inner surface A so that the vehicle traveling on the road is not affected by the crosswind. Therefore, the wind receiving area is small compared to conventional windbreak fences, the horizontal wind load received by the cross wind can be reduced, and it leads to the reduction of the design wind load when installing on the pillar and bridge, It can be an economical configuration.
[0034]
In addition, there is a problem that clogging, dirt, or damage of resin nets used in conventional windbreak fences is concerned, and there is a problem that it takes time and effort for maintenance, but in the windbreak device of the present invention, the flow guide plate is inclined. It is difficult for dust to adhere to it, and there is no problem in strength because it is integrated with the protective fence.
[0035]
Furthermore, since the windbreak device of the present invention has a structure in which the crosswind is deflected upward to generate a wind reduction region, it is difficult to form a wind stagnant region around the protective fence provided with this windbreak device. Even when snowy wind blows, there is no snow accumulation around the protective fence, and it is safe for the vehicle to run and maintenance is easy because it does not require extensive snow removal work. Has an effect.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the structure of a vehicle guard fence with windproof device according to the present invention.
FIG. 2 is a perspective view of a vehicle protection fence with a windproof device as viewed from a road outer surface side direction.
FIG. 3 is a cross-sectional view for explaining a windproof function of the vehicle protective fence with windproof device shown in FIG. 1;
FIG. 4 is a cross-sectional view illustrating a windbreak function using only a first flow guide plate.
FIG. 5 is an explanatory diagram showing a change in wind reduction rate due to a difference in the inclination angle of the first flow guide plate.
FIG. 6 is an explanatory diagram showing a comparison of a wind reduction rate between a vehicle protection fence with a windproof device of the present invention including a first flow guide plate and a second flow guide plate and a protection fence without a windproof device.
[Explanation of symbols]
1: Road 2: Column 3: Upper cross beam 4: Main cross beam 5: Stop bracket 6: Lower cross beam 7: Stop bracket 8: First flow guide plate 8a: First flow guide plate upper end 8b: First flow guide plate lower end 9 : Stop metal fitting 10: Shield plate 11: Second current guide plate 11 a: Second current guide plate upper end 11 b: Second current guide plate lower end 12: Stop metal fitting 13: Blow-through passage 14: Suction port 15: Blowing port 16: Ground cover Part 17: Ventilation part

Claims (3)

In a vehicle protection fence consisting of pillars erected on the shoulders of the road at intervals and transverse beams erected in multiple stages between these pillars, the upper end is below the inner surface of the upper transverse beam at the upper end between the pillars The first flow guide plate is inclined so that the lower end is positioned below the road outer surface, and the middle portion between the columns, and the upper end is positioned above the road inner surface side that is separated from the upper end of the first flow guide plate. And a second baffle plate that is inclined at a larger angle than the first baffle plate so that the lower end is located below the road outer surface side,
A shielding plate that closes the space between the upper transverse beam and the lower first flow guide plate is provided on the lower surface of the upper horizontal beam on the road surface side, and cross wind is protected along the surface of the first flow guide plate and the shielding plate. Form a flow path that leads to the top of the fence,
The upper end of the first flow guide plate and the second flow guide plate is a blowout for further blowing a deflected flow guided along the shielding plate in the direction toward the inner surface of the road above the protection fence. Vehicle protection fence with windbreak device that has a passage .   The second flow guide plate is a plate wider than the first flow guide plate, and the upper end of the second flow guide plate is the same height as the upper end of the first flow guide plate and The vehicle protection fence with windproof device according to claim 1, wherein the vehicle protection fence is provided on the inner surface side of the road which is separated from the upper end by approximately the upper end width of the column, and the lower end is positioned on the vertical line at the lower end of the first flow guide plate. The inclination angle of the first flow guide plate with respect to the support is provided in a range of 30 ° to 60 °, and the inclination angle of the second flow guide plate with respect to the support is provided in a range of 50 ° to 80 °. Vehicle protection fence with windproof device.
(The underlined part above is the part corrected this time)

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