JP2010216095A - Protective fence against wind and snow - Google Patents

Protective fence against wind and snow Download PDF

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Publication number
JP2010216095A
JP2010216095A JP2009061018A JP2009061018A JP2010216095A JP 2010216095 A JP2010216095 A JP 2010216095A JP 2009061018 A JP2009061018 A JP 2009061018A JP 2009061018 A JP2009061018 A JP 2009061018A JP 2010216095 A JP2010216095 A JP 2010216095A
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shielding curtain
wind
snow
ventilation opening
curtain
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Naohiro Maeda
尚宏 前田
Takayuki Amano
隆幸 天野
Kenji Uehara
健嗣 上原
Yasushi Hashimoto
泰志 橋本
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Sekisui Jushi Corp
Maeda Kosen Co Ltd
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Sekisui Jushi Corp
Maeda Kosen Co Ltd
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Priority to JP2009061018A priority Critical patent/JP2010216095A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective fence against wind and snow allowing wind and snow carried by the wind to blow through the protective fence quickly in a scope where wind velocity is reduced on a leeward side from the protective fence while reducing load to be applied on a shielding curtain used for the protective fence against wind and snow. <P>SOLUTION: This protective fence P against wind and snow is constituted by providing the shielding curtain 2 having many vent holes 21 between support columns 1 and allowing wind to blow through the vent holes 21 in the shielding curtain 2 to reduce wind velocity. Each vent hole 21 has area of 144 mm<SP>2</SP>or less, and rate of opening of the vent hole 21 to the whole shielding curtain 2 is 40% or more to prevent the wind blowing through the vent holes 21 in the shielding curtain 2 from causing back flow and turbulent flow in a scope where velocity of wind blowing from a position of the shielding curtain 2 to a position being four times longitudinal width of the shielding curtain 2 is reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、一般道路や高速道路等の路側に沿って設置され、強風や雪害を防止するための防風雪柵に関するものである。   The present invention relates to a windproof snow fence that is installed along roadsides such as general roads and highways, and prevents strong winds and snow damage.

高速道路や一般道路などにおいて横風防止や雪害防止を目的とした防風雪柵が設置されている。防風雪柵としては、網状体、ネット、シートに透孔を形成したもの等の遮蔽幕を用いるものや、金属板等を上下に間隔をおいて設置したもの等がある。例えば、特許文献１には、直径が２〜１０ｍｍの透孔がシート全体に均一に分布し、且つ開口率が２０〜５０％である防雪用透孔シートが提案されている。   Windbreak snow fences are installed on expressways and ordinary roads to prevent crosswinds and snow damage. Examples of the windproof snow fence include a screen using a shielding curtain such as a net, a net, or a sheet formed with a through hole, or a metal plate or the like installed at intervals in the vertical direction. For example, Patent Document 1 proposes a snowproof through-hole sheet in which through-holes having a diameter of 2 to 10 mm are uniformly distributed throughout the sheet and the opening ratio is 20 to 50%.

この防雪用透孔シートは、該シートが取付けられる防雪装置の風上側で小さな乱流を発生させ、風下直下で瞬間的に大きな乱流を発生させ、更により風下側でこの乱流を消失させて風下側の道路上で風速を上げることにより、道路上への堆積を防止しようとするものである。   This snowproof perforated sheet generates a small turbulent flow on the windward side of the snow protection device to which the sheet is attached, generates a large turbulent flow instantaneously directly under the leeward, and further eliminates this turbulent flow on the leeward side. Therefore, it is intended to prevent accumulation on the road by increasing the wind speed on the road on the leeward side.

特公昭６３−２１７６１号公報Japanese Patent Publication No. 63-217161

しかしながら、前記の防雪用透孔シートにおいては、風下直下で大きな乱流を意図的に発生させるようになされているため、該シートが取付けられる防雪装置の風下直下で大きな乱流が発生すると、シートには風上側からの風圧と風下側からの不規則な圧力によって大きな負荷がかかることになり、シートの破断や変形等の耐久性が低下する虞れがあった。   However, in the snowproof perforated sheet, since a large turbulent flow is intentionally generated just below the leeward, when a large turbulent flow occurs just below the lee of the snow protection device to which the sheet is attached, In this case, a large load is applied due to the wind pressure from the windward side and the irregular pressure from the leeward side, and there is a possibility that durability such as breakage and deformation of the sheet is lowered.

本発明は、防風雪柵に用いられる遮蔽幕にかかる負荷を低減させ、かつ防風雪柵から風下側において風が減速する範囲で風及び風によって運ばれる雪が速やかに吹き抜けるようになされた防風雪柵を提供せんとするものである。   The present invention relates to a windbreak snow fence that reduces the load applied to a shielding curtain used for the windbreak snow fence and allows the wind and the snow carried by the wind to blow through quickly in a range where the wind decelerates from the windbreak snow fence on the leeward side. Is intended to provide.

上記目的を達成するために、本発明は次のような構成としている。   In order to achieve the above object, the present invention is configured as follows.

すなわちこの発明に係る防風雪柵は、立設された複数の支柱間に、多数の通風口が形成された可とう性を有する遮蔽幕が設けられ、該遮蔽幕の一方の面から他方の面に前記通風口から風が吹き抜けることにより、風が減速されるようになされた防風雪柵であって、前記各通風口は、その１個の面積を１４４ｍｍ２ 以下とし、かつ遮蔽幕全体に対する前記通風口の開口率を４０％以上とすることにより、遮蔽幕の前記通風口を吹き抜ける風に対して、遮蔽幕の位置から遮蔽幕の縦幅の４倍の位置に至るまでの風が減速される範囲において、逆流及び乱流を生じさせないようにしたことを特徴とするものである。 That is, the windproof snow fence according to the present invention is provided with a flexible shielding curtain in which a large number of ventilation openings are formed between a plurality of standing pillars, and from one surface of the shielding curtain to the other surface. The windbreak snow fence is designed so that the wind is decelerated when the wind blows through the ventilation opening, and each ventilation opening has an area of 144 mm 2 or less, and the entire shielding curtain By setting the opening ratio of the ventilation opening to 40% or more, the wind from the position of the shielding curtain to the position four times the vertical width of the shielding curtain is decelerated with respect to the wind blowing through the ventilation opening of the shielding curtain. In such a range, backflow and turbulence are not generated.

本発明に係る防風雪柵において、前記通風口の１個の面積が１４４ｍｍ２ 〜９ｍｍ２であり、かつ遮蔽幕全体に対する前記通風口の開口率が４０％〜６０％であるように構成してもよい。 In wind Yukisaku according to the present invention, the one area of the ventilation opening is 144mm 2 ~9mm 2, and opening ratio of the vent for the entire shielding curtain is configured to be 40% to 60% Also good.

又本発明に係る防風雪柵において、前記遮蔽幕を、繊維で格子状に編成し、縦方向に延びる帯状部と横方向に延びる帯状部とが形成された網状体からなると共に、縦方向に延びる帯状部と横方向に延びる帯状部とで囲まれる各空間を通風口となるように構成してもよい。   Also, in the windbreak snow fence according to the present invention, the shielding curtain is knitted in a lattice shape with fibers, and is formed of a net-like body in which a belt-like portion extending in the vertical direction and a belt-like portion extending in the horizontal direction are formed, and in the vertical direction. You may comprise so that each space enclosed by the strip | belt part extended and the strip | belt part extended in a horizontal direction may become a ventilation opening.

更に本発明に係る防風雪柵において、前記通風口を、一辺が３ｍｍ〜１２ｍｍのほぼ正方形とし、かつ遮蔽幕全体に対する前記通風口の開口率を４０％〜６０％となるように構成してもよい。   Furthermore, in the windbreak snow fence according to the present invention, the ventilation opening may be configured to be a substantially square having a side of 3 mm to 12 mm, and the opening ratio of the ventilation opening with respect to the entire shielding curtain is 40% to 60%. Good.

本発明によれば、遮蔽幕の各通風口は、その１個の面積を１４４ｍｍ２ 以下とし、かつ遮蔽幕全体に対する前記通風口の開口率を４０％以上とすることにより、遮蔽幕の前記通風口を吹き抜ける風に対して、遮蔽幕の位置から遮蔽幕の縦幅の４倍の位置に至るまでの風が減速される範囲において、逆流及び乱流を生じさせないようにしたので、遮蔽幕から風下直近では乱流等が生じず、風は減速された整流状態で遮蔽幕を吹き抜けて風圧による遮蔽幕への負荷を低減させることができ、且つ風が減速される範囲においては整流状態のまま滞留せずに吹き抜け、防風雪柵の風下側に位置する道路上の積雪を防ぎ、運転手に対する視程障害を低減させることができる。 According to the present invention, each ventilation opening of the shielding curtain has an area of 144 mm 2 or less, and an opening ratio of the ventilation opening with respect to the entire shielding curtain is 40% or more. In the range where the wind from the position of the shielding curtain to the position four times the height of the shielding curtain is decelerated with respect to the wind that blows through the mouth, no reverse flow or turbulent flow is generated. No turbulence or the like occurs in the immediate leeward direction, and the wind blows through the shielding curtain in a decelerated rectified state to reduce the load on the shielding curtain due to wind pressure, and remains in the rectified state in the range where the wind is decelerated. It blows through without staying, prevents snow on the road located on the lee side of the windbreak snow fence, and can reduce visibility obstacles to the driver.

本発明に係る防風雪柵において、前記通風口の１個の面積が１４４ｍｍ２ 〜９ｍｍ２であり、かつ遮蔽幕全体に対する前記通風口の開口率が４０％〜６０％であるように構成すれば、遮蔽幕の剛性を保持し、遮蔽幕に付着した雪が遮蔽幕自身の振動で落下しやすくなるので、より好ましい。 In wind Yukisaku according to the present invention, the a single area of 144mm 2 ~9mm 2 ventilation openings, and be constructed so that the opening ratio of the vent for the entire shielding curtain is 40% to 60% It is more preferable because the rigidity of the shielding curtain is maintained, and the snow attached to the shielding curtain easily falls due to the vibration of the shielding curtain itself.

又本発明に係る防風雪柵において、前記遮蔽幕を、繊維で格子状に編成し、縦方向に延びる帯状部と横方向に延びる帯状部とが形成された網状体からなると共に、縦方向に延びる帯状部と横方向に延びる帯状部とで囲まれる各空間を通風口になるように構成すれば、遮蔽幕自身の振動が比較的減衰しやすいので、遮蔽幕自身への負荷が小さくなり、又バタツキ音が生じにくくなるので、より好ましい。   Also, in the windbreak snow fence according to the present invention, the shielding curtain is knitted in a lattice shape with fibers, and is formed of a net-like body in which a belt-like portion extending in the vertical direction and a belt-like portion extending in the horizontal direction are formed, and in the vertical direction. By configuring each space surrounded by the extending strip-shaped portion and the laterally extending strip-shaped portion to be a ventilation opening, the vibration of the shielding curtain itself is relatively damped, so the load on the shielding curtain itself is reduced. Further, it is more preferable because it is difficult for flicker noise to occur.

更に本発明に係る防風雪柵において、前記通風口を、一辺が３ｍｍ〜１２ｍｍのほぼ正方形とし、かつ遮蔽幕全体に対する前記通風口の開口率を４０％〜６０％となるように構成すれば、遮蔽幕の作成が容易であり、縦横の区別なく遮蔽幕を利用することができるので、より好ましい。   Furthermore, in the windproof snow fence according to the present invention, if the ventilation opening is configured to be approximately square with a side of 3 mm to 12 mm, and the opening ratio of the ventilation opening with respect to the entire shielding curtain is 40% to 60%, Since it is easy to create a shielding curtain and the shielding curtain can be used without any distinction between vertical and horizontal directions, it is more preferable.

本発明に係る防風雪柵の実施の一形態を示す正面図である。It is a front view which shows one Embodiment of the windproof snow fence which concerns on this invention. 遮蔽幕の通風口の一片と開口率と関係を示す表である。It is a table | surface which shows a piece and the opening rate of the ventilation opening of a shielding curtain. 遮蔽幕の実施例を示す部分拡大概略図である。It is the partial expansion schematic which shows the Example of a shielding curtain. 遮蔽幕の比較例を示す部分拡大概略図である。It is the partial expansion schematic which shows the comparative example of a shielding curtain. 遮蔽幕の他の比較例を示す部分拡大概略図である。It is the partial expansion schematic which shows the other comparative example of a shielding curtain. 遮蔽幕の試験方法を示す説明図である。It is explanatory drawing which shows the test method of a shielding curtain. 遮蔽幕の試験結果を示すグラフである。It is a graph which shows the test result of a shielding curtain. 遮蔽幕の試験結果を示すグラフである。It is a graph which shows the test result of a shielding curtain. 遮蔽幕を吹き抜ける風の挙動の模式図である。It is a schematic diagram of the behavior of the wind blowing through the shielding curtain.

次に、本発明を実施するための最良の形態について図面を参照し、具体的に説明する。   Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

図１において、１は立設された支柱、２は支柱１の間に設けられた遮蔽幕であり、本発明に係る防風雪柵Ｐは、支柱１及び遮蔽幕２から主に構成され、遮蔽幕２に形成された通風口２１から風が吹き抜けることにより、風が減速されるものである。支柱１は、遮蔽幕２の横幅に応じて適宜間隔で立設されたものであり、一般には、強度的に安定しておりコストの安い丸パイプ、角パイプ等の鋼管や、断面Ｈ字状やＴ字状の鋼材が好適に用いられる。   In FIG. 1, reference numeral 1 is an upright support column, 2 is a shielding screen provided between the support columns 1, and the windproof snow fence P according to the present invention is mainly composed of the support column 1 and the shielding screen 2, and is shielded. The wind is decelerated when the wind blows through the vent 21 formed in the curtain 2. The struts 1 are erected at appropriate intervals according to the width of the screen 2 and are generally steel pipes such as round pipes and square pipes that are stable in strength and low in cost, or have an H-shaped cross section. Or a T-shaped steel material is preferably used.

遮蔽幕２は、多数の通風口２１が形成された可とう性を有するものであり、本実施形態では、繊維を格子状に編成し、縦方向に延びる帯状部２２と横方向に延びる帯状部２３とが形成された網状体からなる。そして、縦方向に延びる帯状部２２と横方向に延びる帯状部２３とで囲まれる各空間が通風口２１となされている。   The shielding curtain 2 has a flexibility in which a large number of ventilation holes 21 are formed. In this embodiment, the strips 22 knitting fibers in a lattice shape and extending in the longitudinal direction and the strip-like portions extending in the lateral direction. And 23 is formed. Each space surrounded by the belt-like portion 22 extending in the vertical direction and the belt-like portion 23 extending in the horizontal direction is a vent hole 21.

遮蔽幕２は、特に網状体に限定されるものではなく、布状のもの、合成樹脂製のシート状のもの、可とう性のシートにパンチング加工を施したもの等、適宜用いてよい。   The shielding curtain 2 is not particularly limited to a net-like body, and may be suitably used such as a cloth-like one, a synthetic resin sheet-like one, a flexible sheet obtained by punching.

遮蔽幕２は、本実施形態では、１個の遮蔽幕２を支柱１の間に設けたものであるが、上下に複数設けたものでもよく、或いは左右に複数連設したものでもよい。   In this embodiment, the shielding curtain 2 is provided with one shielding curtain 2 between the support columns 1, but a plurality of shielding curtains 2 may be provided on the top and bottom, or a plurality of shielding curtains may be provided on the left and right.

遮蔽幕２には、遮蔽幕２を端縁に沿って支持材３が取付けられている。そして、この支持材３により、大きな風圧が加わる遮蔽幕２が支持されると共に、該支持材３を介して、遮蔽幕２が支柱１の間に設けられている。   A supporting material 3 is attached to the shielding curtain 2 along the edge of the shielding curtain 2. The support material 3 supports the shielding curtain 2 to which a large wind pressure is applied, and the shielding curtain 2 is provided between the columns 1 via the support material 3.

支持材３は、大きな風圧が加わる遮蔽幕１を支持することを考慮すると金属製のものを用いるのが好ましく、アルミニウム、ステンレス、鉄鋼等のパイプ、形材や、それらにめっき、塗装を施したもの等を好適に用いることができる。   In consideration of supporting the shielding curtain 1 to which a large wind pressure is applied, it is preferable to use a metal material for the support material 3, such as pipes and shapes such as aluminum, stainless steel, steel, etc., and plating and coating them. A thing etc. can be used conveniently.

かかる支持材３は、遮蔽幕２の上下端縁及び左右端縁に沿って設けられた矩形状の枠体とすれば遮蔽幕２をより強固に支持することができるので好ましいが、遮蔽幕２にかかる大きな風圧を支持できるものであれば、遮蔽幕２の上端端縁或いは左右端縁の一部のみに設けたものでもよい。   Such a support member 3 is preferably a rectangular frame provided along the upper and lower edges and the left and right edges of the shielding curtain 2, since it can support the shielding curtain 2 more firmly, but the shielding curtain 2 is preferable. As long as the large wind pressure can be supported, the shield curtain 2 may be provided only on the upper edge or part of the left and right edges.

以下、実施例により防風雪柵Ｐの遮蔽幕２の具体例及びその効果を説明するが、本発明は下記の実施例に限定されるものではない。   Hereinafter, although the specific example and effect of the shielding curtain 2 of the wind-proof snow fence P are demonstrated by an Example, this invention is not limited to the following Example.

ポリエステル製合成繊維をカラミ織により編成し、縦方向に延びる帯状体と横方向に延びる帯状体とが形成された網状体にして格子状の遮蔽幕を得た。   A synthetic shield fiber made of polyester was knitted by calami weaving to obtain a lattice-shaped shielding curtain in a net-like body in which a belt-like body extending in the vertical direction and a belt-like body extending in the horizontal direction were formed.

図３の（ａ）は遮蔽幕の実施例１の部分拡大図を示すものであり、通風口はほぼ正方形となされ、一辺ｄが３ｍｍで面積が９ｍｍ２、遮蔽幕全体に対する通風口の開口率εは４０％である。尚、図において、繊維の編成状態は省略して記載している。 FIG. 3A shows a partially enlarged view of the first embodiment of the shielding curtain. The ventilation opening is substantially square, the side d is 3 mm, the area is 9 mm 2 , and the opening ratio of the ventilation opening with respect to the entire shielding curtain. ε is 40%. In the figure, the knitted state of the fiber is omitted.

図３の（ｂ）は遮蔽幕の実施例２の部分拡大図を示すものであり、実施例１と同様な方法で得た遮蔽幕である。通風口はほぼ正方形となされ、一辺ｄが１２ｍｍで面積が１４４ｍｍ２、遮蔽幕全体に対する通風口の開口率εは４０％である。 FIG. 3B is a partially enlarged view of the shielding curtain according to the second embodiment, and is a shielding curtain obtained by the same method as that of the first embodiment. The ventilation opening is substantially square, the side d is 12 mm, the area is 144 mm 2 , and the opening ratio ε of the ventilation opening with respect to the entire shielding curtain is 40%.

［比較例１］
図４の（ａ）は遮蔽幕の比較例１の部分拡大図を示すものであり、通風口２１はほぼ正方形となされ、一辺ｄが２ｍｍで面積が４ｍｍ２、遮蔽幕２全体に対する通風口２１の開口率εは３０％であること以外は、実施例１と同様である。 [Comparative Example 1]
FIG. 4A shows a partially enlarged view of Comparative Example 1 of the shielding curtain. The ventilation opening 21 is substantially square, the side d is 2 mm, the area is 4 mm 2 , and the ventilation opening 21 for the entire shielding curtain 2 is shown. The aperture ratio ε is the same as in Example 1 except that the aperture ratio ε is 30%.

［比較例２］
図４の（ｂ）は遮蔽幕の比較例２の部分拡大図を示すものであり、通風口はほぼ正方形となされ、一辺ｄが４ｍｍで面積が１６ｍｍ２、遮蔽幕全体に対する通風口の開口率εは３０％であること以外は、実施例１と同様である。 [Comparative Example 2]
FIG. 4B shows a partially enlarged view of Comparative Example 2 of the shielding curtain. The ventilation opening is substantially square, the side d is 4 mm, the area is 16 mm 2 , and the opening ratio of the ventilation opening with respect to the entire shielding curtain. ε is the same as that of Example 1 except that it is 30%.

［比較例３］
図４の（ｃ）は遮蔽幕の比較例３の部分拡大図を示すものであり、通風口はほぼ正方形となされ、一辺ｄが８ｍｍで面積が６４ｍｍ２、遮蔽幕全体に対する通風口の開口率εは３５％であること以外は、実施例１と同様である。 [Comparative Example 3]
FIG. 4C shows a partially enlarged view of the shielding curtain comparative example 3. The ventilation opening has a substantially square shape, the side d is 8 mm, the area is 64 mm 2 , and the opening ratio of the ventilation opening with respect to the entire shielding curtain is shown. ε is the same as in Example 1 except that it is 35%.

［比較例４］
図５の（ａ）は遮蔽幕の比較例４の部分拡大図を示すものであり、通風口はほぼ正方形となされ、一辺ｄが２４ｍｍで面積が５７６ｍｍ２、遮蔽幕全体に対する通風口の開口率εは４０％であること以外は、実施例１と同様である。 [Comparative Example 4]
FIG. 5A shows a partially enlarged view of Comparative Example 4 of the shielding curtain. The ventilation opening is substantially square, the side d is 24 mm, the area is 576 mm 2 , and the opening ratio of the ventilation opening with respect to the entire shielding curtain is shown. ε is the same as in Example 1 except that it is 40%.

［比較例５］
図５の（ｂ）は遮蔽幕の比較例５の部分拡大図を示すものであり、通風口はほぼ正方形となされ、一辺ｄが２４ｍｍで面積が５７６ｍｍ２、遮蔽幕全体に対する通風口の開口率εは３３％であること以外は、実施例１と同様である。 [Comparative Example 5]
FIG. 5B shows a partial enlarged view of the comparative example 5 of the shielding curtain. The ventilation opening is substantially square, the side d is 24 mm, the area is 576 mm 2 , and the opening ratio of the ventilation opening with respect to the entire shielding curtain is shown. ε is the same as that of Example 1 except that it is 33%.

これら実施例、比較例の通風口の一辺ｄと開口率εとの関係を図２に示し、表1に示された遮蔽幕の実施例の部分拡大概略図を図３、比較例の部分拡大概略図を図４，５に示す。又図１中の符号Ａ〜Ｆ，Ｈは実施例１，２、及び比較例１〜５に対応している。   FIG. 2 shows the relationship between the side d of the vent and the opening ratio ε of these examples and comparative examples. FIG. 3 is a partially enlarged schematic view of the example of the shielding curtain shown in Table 1, and FIG. A schematic diagram is shown in FIGS. Reference numerals A to F and H in FIG. 1 correspond to Examples 1 and 2 and Comparative Examples 1 to 5.

上記のようにして得られた本発明に係る防風雪柵Ｐの遮蔽幕及び比較例に示した遮蔽幕について、図６に示された測定装置を用いて、遮蔽幕の一方の面から他方の面に、通風口から吹き抜けた風の挙動を観測した。尚、遮蔽幕の実際の設置環境を考慮して、遮蔽幕の上方及び下方を通過する風の挙動も併せて観測した。   With respect to the shielding curtain of the windbreak snow fence P according to the present invention obtained as described above and the shielding curtain shown in the comparative example, the measurement device shown in FIG. On the surface, we observed the behavior of the wind blown from the vent. In consideration of the actual installation environment of the shielding curtain, the behavior of the wind passing above and below the shielding curtain was also observed.

図６の測定装置の概要は以下の通りである。
使用装置：レーザードップラー流速計
測定方法：試験機本体において遮蔽幕を空中で保持し、遮蔽幕の風上の粒子発生機から一定速度で粒子を流し、測定器から照射される２本のレーザービームを交差させて交差領域に干渉縞を形成し、該交差領域を移動させながら交差領域を通過する粒子の速度を散乱光の周波数に基づいて検出することにより、主に遮蔽幕の風下側での速度変化を測定する。 The outline of the measuring apparatus of FIG. 6 is as follows.
Equipment used: Laser Doppler velocimeter Measurement method: Two laser beams irradiated from the measuring instrument by holding the shielding curtain in the air in the tester body, flowing particles at a constant speed from the particle generator on the windward side of the shielding curtain By detecting the velocity of particles passing through the crossing region based on the frequency of the scattered light while moving the crossing region, mainly on the leeward side of the shielding curtain. Measure the speed change.

図７，８は、上記試験に基づき、遮蔽幕の一方の面から他方の面に通風口から風が吹き抜けた際、遮蔽幕からの位置ｘを遮蔽幕の縦幅Ｌで除したｘ／Ｌを横軸に、その位置での風の速度Ｕを初速度Ｕ０で除したＵ／Ｕ０を縦軸に表したものを示したグラフである。 FIGS. 7 and 8 are based on the above test, and x / L is obtained by dividing the position x from the shielding curtain by the vertical width L of the shielding curtain when the wind blows from one side of the shielding curtain to the other side. the horizontal axis is a graph showing a representation of U / U 0 obtained by dividing the initial velocity U 0 of the velocity U of the wind at the position on the vertical axis.

図９は、風の挙動の模式図を示すものであり、図７，８の縦軸のＵ／Ｕ０において、正の値は風が風下側へ吹き抜けている順流Ｊであることを示し、逆に負の値は風が反対方向に流れる逆流Ｇを示し、又不規則に乱れ流れているものは乱流Ｒを示す。 FIG. 9 shows a schematic diagram of the behavior of the wind. In U / U 0 on the vertical axis of FIGS. 7 and 8, a positive value indicates that the wind is a forward flow J that blows down to the leeward side. On the contrary, a negative value indicates a reverse flow G in which the wind flows in the opposite direction, and an irregularly turbulent flow indicates a turbulent flow R.

図７に見られるように、遮蔽幕全体に対する通風口の面積が４０％未満の比較例１〜３（Ｃ，Ｄ，Ｅ）は、遮蔽幕の通風口1個の面積に寄らず、遮蔽幕の位置が遮蔽幕の縦幅の１〜３倍の位置において風の速度が負の値となり、逆流Ｇが生じていることが分かる。これにより、一般道路や高速道路等において道路の路側から比較的近接して防風雪柵が設置される場合は、遮蔽幕を通過した風雪が道路上を速やかに吹き抜けず滞留が生じ、道路上に積雪したり、通行する車の運転手に対して視程障害等の悪影響が発生したりする虞れがある。   As can be seen in FIG. 7, Comparative Examples 1 to 3 (C, D, E) in which the area of the ventilation opening with respect to the entire shielding curtain is less than 40% do not depend on the area of one ventilation opening of the shielding curtain. It can be seen that the backflow G is generated when the wind speed is a negative value at a position of 1 to 3 times the vertical width of the shielding curtain. As a result, when windbreaks and snow fences are installed relatively close to the roadside on ordinary roads and expressways, the wind and snow that has passed through the shielding curtain does not blow through the roads quickly and stays on the road. There is a risk of snow accumulation or adverse effects such as visibility problems on the driver of a passing vehicle.

従って、遮蔽幕全体に対する通風口の面積が４０％以上であれば、遮蔽幕の位置から遮蔽幕の縦幅の４倍の位置に至るまでの風が減速される範囲において、風の逆流Ｇは発生しないため、遮蔽幕を通過した風雪が道路上を速やかに吹き抜け、道路を通行する車の運転手に対する視程を確保しやすくなる。   Therefore, if the area of the ventilation opening with respect to the entire shielding curtain is 40% or more, the wind reverse flow G is within the range where the wind is decelerated from the position of the shielding curtain to the position four times the vertical width of the shielding curtain. Since it does not occur, the wind and snow that has passed through the shielding curtain quickly blows through the road, making it easier to ensure visibility for the driver of the car traveling on the road.

又図８に見られるように、遮蔽幕の通風口の一辺ｄが１２ｍｍで面積が１４４ｍｍ２以上の比較例４，５（Ｆ，Ｈ）では、通風口の開口率に寄らず遮蔽幕の風下直下で風の速度の変化が大きく、又不規則となり、乱流Ｒが生じていることが分かる。これにより、遮蔽幕の風上側からの風圧と風下側の乱流Ｒに起因する不規則な圧力により、遮蔽幕に大きな負荷がかかることになり、遮蔽幕の破断や変形等が生じて耐久性が低下する虞れがある。 Further, as seen in FIG. 8, in Comparative Examples 4 and 5 (F, H) in which the side d of the shielding curtain is 12 mm and the area is 144 mm 2 or more, the lee of the shielding curtain is not affected by the aperture ratio of the ventilation opening. It can be seen that there is a large change in wind speed immediately below, and irregularity, and turbulence R is generated. As a result, a large load is applied to the shielding curtain due to an irregular pressure caused by the wind pressure from the windward side of the shielding curtain and the turbulent flow R on the leeward side, and the shielding curtain is broken or deformed, resulting in durability. May decrease.

従って、遮蔽幕全体に対する通風口の開口率が４０％以上であり、且つ遮蔽幕の通風口の一辺が３〜１２ｍｍ、通風口の面積が１４４ｍｍ２〜９ｍｍ２であれば、遮蔽幕の位置から遮蔽幕の縦幅の４倍の位置に至るまでの風が減速される範囲において、逆流Ｇや乱流Ｒは発生しないため、遮蔽幕を通過した風雪が道路上を速やかに吹き抜け、道路を通行する車の運転手に対する視程を確保しやすくなる。 Therefore, it is the opening ratio of the ventilation opening is over 40% for the entire shielding curtain, and the one side of the ventilation opening of the shielding curtain 3 to 12 mm, the area of vents if 144mm 2 ~9mm 2, from the position of the shielding curtain Backflow G and turbulent flow R do not occur in the range where the wind up to 4 times the height of the screen is decelerated, so wind and snow that passes through the screen quickly blows through the road and passes through the road It becomes easy to ensure visibility for the driver of the car.

尚、遮蔽幕の位置から遮蔽幕の縦幅の４倍の位置に至るまでの風が減速される範囲に限定して、逆流・乱流の存在を測定した理由は、それ以上の距離になると遮蔽幕の通風口、開口率の影響が小さくなるため、比較が不明確になることによる。   The reason for measuring the presence of backflow and turbulence is limited to the range where the wind from the position of the shielding curtain to the position four times the vertical width of the shielding curtain is decelerated. This is because the comparison is unclear because the influence of the vent and the aperture ratio of the shielding curtain is reduced.

遮蔽幕２の通風口２１の開口率は６０％を超えると、遮蔽幕２から風下側において風が減速される範囲が狭くなり、又、遮蔽幕２を構成する縦方向及び横方向の帯状体２２、２３の幅が相対的に狭くなって遮蔽幕２の強度が低下する虞れがある。   When the opening ratio of the ventilation opening 21 of the shielding curtain 2 exceeds 60%, the range in which the wind is decelerated from the shielding curtain 2 on the leeward side becomes narrow, and the longitudinal and lateral strips constituting the shielding curtain 2 become narrower. There is a possibility that the strength of the shielding curtain 2 is lowered due to the relatively narrow widths of 22 and 23.

従って、遮蔽幕全体に対する通風口の開口率が４０％〜６０％であり、且つ遮蔽幕の通風口の一辺が３〜１２ｍｍ、通風口の面積が１４４ｍｍ２〜９ｍｍ２であれば、上記の風が減速される範囲をより確実に確保しながら、遮蔽幕を通過した風雪が道路上を速やかに吹き抜け、道路を通行する車の運転手に対する視程を確保しやすくなると共に、遮蔽幕の耐久性をより確実に保持できるので、より好ましい。 Accordingly, an aperture ratio of 40% to 60% of vents for the entire shielding curtain and one side of the ventilation opening of the shielding curtain 3 to 12 mm, the area of the ventilation opening if 144mm 2 ~9mm 2, above the wind The wind and snow that has passed through the screen will blow through the road quickly, ensuring visibility for the driver of the car traveling on the road, and ensuring the durability of the screen. Since it can hold | maintain more reliably, it is more preferable.

１ 支柱
２ 遮蔽幕
２１ 通風口
２２ 帯状体
２３ 帯状体
３ 支持材
Ｇ 逆流
Ｒ 乱流
Ｐ 防風雪柵 DESCRIPTION OF SYMBOLS 1 Support | pillar 2 Shielding curtain 21 Ventilation hole 22 Strip-like body 23 Strip-like body 3 Support material G Backflow R Turbulence P Windproof snow fence

Claims (4)

立設された複数の支柱間に、多数の通風口が形成された可とう性を有する遮蔽幕が設けられ、該遮蔽幕の一方の面から他方の面に前記通風口から風が吹き抜けることにより、風が減速されるようになされた防風雪柵であって、前記各通風口は、その１個の面積を１４４ｍｍ２以下とし、かつ遮蔽幕全体に対する前記通風口の開口率を４０％以上とすることにより、遮蔽幕の前記通風口を吹き抜ける風に対して、遮蔽幕の位置から遮蔽幕の縦幅の４倍の位置に至るまでの風が減速される範囲において、逆流及び乱流を生じさせないようにしたことを特徴とする防風雪柵。 A flexible shielding curtain in which a large number of ventilation openings are formed is provided between a plurality of standing pillars, and wind blows from the ventilation opening to the other surface of the shielding curtain. , a windbreak Yukisaku was made as wind is decelerated, each vent has one area that a 144 mm 2 or less, and the aperture ratio of the vent for the entire shielding curtain 40% and As a result, backflow and turbulence are generated in the range where the wind from the position of the shielding curtain to the position four times the vertical width of the shielding curtain is decelerated with respect to the wind blowing through the ventilation opening of the shielding curtain. A windbreak snow fence characterized by not allowing it to occur. 前記通風口の１個の面積は１４４ｍｍ２〜９ｍｍ２であり、かつ遮蔽幕全体に対する前記通風口の開口率は４０％〜６０％であることを特徴とする請求項１に記載の防風雪柵。 One area of the vent is 144mm 2 ~9mm 2, and windproof Yukisaku according to claim 1, wherein the opening ratio of the vent for the entire shielding curtain is 40% to 60% . 前記遮蔽幕は、繊維が格子状に編成されて、縦方向に延びる帯状部と横方向に延びる帯状部とが形成された網状体からなると共に、縦方向に延びる帯状部と横方向に延びる帯状部とで囲まれる各空間が通風口となされていることを特徴とする請求項１又は２に記載の防風雪柵。   The shielding curtain is formed of a net-like body in which fibers are knitted in a lattice shape and formed with a belt-like portion extending in the vertical direction and a belt-like portion extending in the horizontal direction, and the belt-like portion extending in the vertical direction and the belt-like shape extending in the horizontal direction. Each space enclosed with a part is made into the ventilation opening, The windproof snow fence of Claim 1 or 2 characterized by the above-mentioned. 前記通風口は、一辺が３ｍｍ〜１２ｍｍのほぼ正方形であり、かつ遮蔽幕全体に対する前記通風口の開口率は４０％〜６０％であることを特徴とする請求項３に記載の防風雪柵。   4. The windbreak snow fence according to claim 3, wherein the ventilation port has a substantially square shape with a side of 3 mm to 12 mm, and an opening ratio of the ventilation port with respect to the entire shielding curtain is 40% to 60%.
JP2009061018A 2009-03-13 2009-03-13 Protective fence against wind and snow Pending JP2010216095A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017106284A (en) * 2015-12-11 2017-06-15 三菱ケミカルインフラテック株式会社 Windshield snow prevention net and windshield snow prevention net fence
WO2021169055A1 (en) * 2020-02-28 2021-09-02 山东建筑大学 Quick-assembly windbreak device for preventing storm damage to low-rise wooden dwelling

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JPS5777704A (en) * 1980-10-31 1982-05-15 Dainippon Plastics Permeation pore sheet for preventing snow
JPS5828324A (en) * 1981-07-10 1983-02-19 Hiraoka & Co Ltd Rough sheet capable of high frequency sewing for agriculture, forestry, civil engineering, building and long and wide structure obtained from said sheet by high frequency sewing
JPS5857934A (en) * 1981-10-02 1983-04-06 平岡織染株式会社 Ventilating sheet for agricultural civil engineering construction which can thermally be stitched
JPH087026Y2 (en) * 1988-03-11 1996-02-28 繁雄 小川 Snow net
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JPH11107106A (en) * 1997-10-06 1999-04-20 Teijin Ltd Sheet capable of adjusting passage amount of fluid
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JP3115624U (en) * 2005-08-09 2005-11-10 村上 正幸 Blown snow fence

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017106284A (en) * 2015-12-11 2017-06-15 三菱ケミカルインフラテック株式会社 Windshield snow prevention net and windshield snow prevention net fence
WO2021169055A1 (en) * 2020-02-28 2021-09-02 山东建筑大学 Quick-assembly windbreak device for preventing storm damage to low-rise wooden dwelling

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