JP6546082B2 - Net for windproof and snow protection, and net fence for windproof and snow protection - Google Patents

Description

  The present invention relates to a net for windproof and snow protection, and a net fence for windproof and snow protection.

  On roads and tracks in heavy snow areas, so-called visibility problems occur in which visibility of a driver of a passing vehicle or a pedestrian decreases due to the influence of snow blowing. Since visibility problems cause delays in public transportation, collisions, etc., conventionally, along the upwind side edge of roads, etc., as a method to reduce the amount of snow that blows on roads etc. and alleviate visibility problems. Installation of windbreaks and snow fences. In recent years, a net-like windproof snow protection net is preferably used as a windproof snow protection fence because it has a small effect of blocking the landscape and is excellent in the visibility (hereinafter referred to as "visibility").

  A net made of a synthetic resin may be used for the windproof and snowproof net because it is excellent in the weather resistance and the like. For example, Patent Document 1 describes a snow-preventing through-hole sheet in which through holes having an average diameter of 2 to 10 mm are uniformly distributed throughout the sheet, and the opening ratio is 20 to 50%. Patent Document 2 discloses that a plastic non-woven mesh structure having a grid-like oriented strand (yarn) and a mesh surrounded by a bond formed therebetween is used for a snow fence. Patent Document 3 discloses that the fibers of the net consist of synthetic fibers having a single yarn fineness of 3 denier to 15 denier, a strength of 6.0 to 15.0 g / denier, and an elongation at break of 10 to 35%. A net that is coated and focused with an acrylic or silicone resin in an amount of 70% by weight to prevent the penetration of sand or the like into fibers to prevent abrasion, and the net has a breaking strength of 20 kg or more and an elongation of 30% to It is 60%, and when the net stretches, the processed coating extends following the elongation of the net, and the coating does not crack in the coating, and a civil engineering net is maintained on the inclined surface etc. Is disclosed for use in

Japanese Patent Publication Sho 63-021761 Japanese Examined Patent Publication No. 01-032060 Patent No. 3781222 gazette

According to the net described in Patent Document 1, it is possible to enhance the snow accumulation effect by setting the sheet opening ratio to 20 to 50% in the windbreak type windproof snow fence. The case of using it as a windproof or windproof fence is not considered, and when the aperture ratio is applied as it is to a windproof or windproof fence, a sufficient windproof and snow effective effect There were times when I could not get Moreover, in patent documents 2 and 3, examination about the relation between the aperture ratio of a net and the windproof snow protection effect is not carried out.
Further, in the nets described in Patent Documents 1 to 3, the area of the eyes of the net apparently decreases when viewed from the oblique direction with respect to the plane of the net, and sufficient visibility may not be obtained.
Furthermore, in the case where the nets described in Patent Documents 1 to 3 are installed, if the snow cover extends to the upper side of the fence, the net may break or hold the net due to the settling force of snow at the time of snow melting such as spring The frame of the fence to be

  Therefore, the present invention provides a windproof or windproof snow protection net having an excellent wind resistance, snow protection and visibility, and a strength that can withstand the settling force of snow at the time of snow melting, and the wind protection snow net. An object is to provide a net fence for windproof and snow protection provided with a net.

  As a result of intensive studies, the present inventors made a net having a longitudinal band and a transverse band from a predetermined material, set the opening ratio of the net to a predetermined range, and set the density at the upper end and the lower end of the net. By making it higher than the density of an inner part, it discovers that the said subject is solvable and came to complete this invention.

  That is, according to a first aspect of the present invention, there is provided a net for windproof and snow protection comprising a mesh-like article made of synthetic resin fibers impregnated with a resin and having a vertical band and a horizontal band. And the density of the horizontal band at the upper end and the lower end which are each within 5 cm from the lower end is higher than the density of the horizontal band at the inward part of the windproof and snow protection net and the horizontal band at the upper end and the lower end It is a net for wind and snow protection, characterized in that the vertical distance is narrower than the vertical distance of the horizontal band in the inner part, and the opening ratio of the inner part of the net for wind and snow protection is 40 to 55%.

In the present invention, "longitudinal" or "upper and lower" means a direction which is the vertical direction in the posture in which the windproof and snowproof net of the present invention is installed, and "horizontal" means the direction which is the horizontal direction in the posture. means. Further, the vertical direction and the horizontal direction in the posture in which the windproof and snowproof net of the present invention is installed may be simply referred to as "vertical direction" and "horizontal direction".
In the present invention, the "inward portion" means the upper end portion, the lower end portion, and a portion excluding the belt inserting portion formed at the upper end and the lower end of the upper end portion in the windproof snowproof net of the present invention. Do.
In the present invention, "density" means area density.
In the present invention, "the opening ratio of the inner part" means the ratio of the total area of the opening (in the eye of the net) present in the inner part to the total area of the inner part of the windproof and snowproof net. Do.

  In the first aspect of the present invention, the distance between the vertical bands in the inner portion is 15 to 30 mm, the distance between the horizontal bands is 5 to 20 mm, and the distance between the horizontal bands at the upper end and the lower end is 2 It is preferable that it is -10 mm.

  In the first aspect of the present invention, the fibers may be woven in a zigzag shape between adjacent transverse bands at the upper end and the lower end.

  A second aspect of the present invention is a net fence for windproof and snow protection using the net for windproof and snow protection according to the first aspect of the present invention.

  According to the present invention, a windproof or windproof snow protection net having excellent wind resistance, snow protection and visibility and withstanding strength of snow settling at the time of snow melting, and the wind protection snow net It is possible to provide a net fence for windproof and snow protection provided with a net.

It is a figure which shows a mode that the net fence 20 for windproof snow protection concerning 1st embodiment of this invention is installed along the side edge of a road. It is the figure which looked at the net fence 20 for windproof snow protection concerning 1st embodiment of this invention from the direction (direction shown by II in FIG. 1) perpendicular | vertical with respect to the surface direction of the windproof snow net 10. FIG. It is an enlarged view of the area | region shown by III in FIG. It is an enlarged view of the area | region shown by IV in FIG. It is an enlarged view of the area | region shown by V in FIG. It is the figure which looked at the net fence 30 for windproof snow protection concerning 2nd embodiment of this invention from the same viewpoint as FIG. It is the figure which looked at the net fence 40 for windproof snow protection concerning 3rd embodiment of this invention from the same viewpoint as FIG. It is a figure which shows the measurement result of the windproof effect of the net fence model which concerns on Example 1. FIG. It is a figure which shows the measurement result of the windproof effect of the net fence model which concerns on the comparative example 1. FIG. It is a figure which shows the measurement result of the windproof effect of the net fence model which concerns on the comparative example 2. FIG.

  Hereinafter, a net for windproof and snow protection as an example of an embodiment of the present invention and a net fence for windproof and snow protection will be described. However, the present invention is not limited to the windproof snow protection net and the windproof snow protection net fence. In addition, unless otherwise indicated, the notation "A-B" about numerical value A and B shall mean "A or more and B or less." When a unit is attached only to the numerical value B in this notation, the unit is also applied to the numerical value A. Further, in the drawings shown below, some members may be omitted or exaggerated.

<Net fence 20 for windproof and snow protection>
FIG. 1 is a view showing a state in which a windproof and snow fence net fence 20 according to a first embodiment of the present invention is installed along a side edge 22 of a road 21. As shown in FIG. Further, FIG. 2 is a view of a part of the windproof and snowproof net fence 20 as seen from a direction perpendicular to the surface direction of the windproof and snowproof net 10 (the direction shown by II in FIG. 1). As shown in FIG. 1 and FIG. 2, the windproof and snowfall net fence 20 is a belt 12 and a fixing member 13 (see FIG. 5) in a frame 11 where the windproof and snowfall net 10 has a vertical frame 11a and a horizontal frame 11b. It is the structure fixed via (it abbreviate | omitted in FIG. 1, 2).
In FIG. 1, the side edge 22 is located on the windward side of the road 21, and the side edge 23 is located on the windward side of the road 21. From the viewpoint of preventing blowing of snow blowing into the road 21, the windproof snow net fence 20 is at least at the windward side edge of the road so that the surface direction of the windproof snow net 10 is along the path direction of the road 11. It is preferable to be installed, and you may install in the side edge of the upwind and downwind both sides.
Hereinafter, these components which comprise the net fence 20 for windproofing / snow preventing are demonstrated.

(Windproof snow net 10)
The windproof and snowproof net 10 has a sheet-like and net-like shape, and is a member that inhibits the penetration of snow blowing into the road 21 from the windward side.
As shown in FIG. 2, the windproof and snowproof net 10 includes an inward portion 1, an upper end 2, a lower end 3, and a belt insertion 4.
3 shows an enlarged view of the region indicated by III in FIG. 2, FIG. 4 shows an enlarged view of the region indicated by IV in FIG. 2, and FIG. 5 shows an enlarged view of the region indicated by V in FIG. In FIGS. 3 to 5, the direction indicated by the arrow X is the vertical direction, and the direction indicated by the arrow Y is the horizontal direction.

  The structure of the inward portion 1 will be described with reference to FIG. The inward portion 1 has a longitudinal direction in the vertical direction and a plurality of longitudinal bands 1a juxtaposed at predetermined intervals in the horizontal direction, and a horizontal band 1b having the longitudinal direction in the horizontal direction and juxtaposed in the vertical direction The vertical bands 1a and the horizontal bands 1b are formed in a net shape having uniform eyes 1c by being woven in the direction orthogonal to each other.

The width of the vertical band 1a shown by W ₁ in FIG. 3 is preferably 3.0 to 10 mm, more preferably 4.0 to 9.5 mm, and 5.0 to 9.0 mm. Is more preferred. When the width of the vertical band 1a is within the above range, the required strength can be secured against wind load and snow load.
Moreover, it is preferable that it is 10-30 mm, as for the space | interval of the horizontal direction of the vertical strip 1a shown by D ₁ in FIG. 3, it is more preferable that it is 13-28 mm, and it is more preferable that it is 15-27 mm. Since the horizontal interval of the vertical bands 1a is within the above range, it is possible to suppress the decrease in the aperture ratio when the inward portion 1 is viewed from the oblique direction, and to ensure the wind reduction effect and visibility. .

The width of the horizontal band 1b indicated by W ₂ in FIG. 3 is preferably 3.0 to 10 mm, more preferably 4.0 to 9.5 mm, and 5.0 to 9.0 mm. Is more preferred. When the width of the horizontal band 1b is within the above range, necessary strength can be secured against tension, wind load and snow load during laying of the net.
Further, the vertical spacing of the lateral band 1b shown in FIG. 3 in _{D 2} is preferably 5 to 20 mm, more preferably 7～18Mm, more preferably from 10-15 mm. When the distance between the horizontal bands 1b in the vertical direction is within the above range, it is possible to suppress the decrease in the aperture ratio when the inward portion 1 is viewed from the oblique direction, and to ensure the wind speed damping effect and visibility. .

The width in the vertical direction of the inward portion 1 is not particularly limited, but is preferably 1.6 to 2.2 m from the viewpoints of transportability, workability, and storability after removal, and is preferably 1.7 to 2.1 m. Is more preferably 1.8 to 2.0 m.
In addition, it is also possible to install the net 10 for windproofing / snowing according to the present invention in two or more stages in the vertical direction.

The structures of the upper end portion 2 and the belt insertion portion 4 will be described with reference to FIG. 4. The structure of the lower end portion 3 can be the same as that of the upper end portion 2 except that the upper end portion 2 is inverted in the vertical direction, and the description thereof is omitted here.
In FIG. 4, the upper end portion 2, the belt insertion portion 4 formed in the lower portion of the upper end portion 2, and the inward portion 1 located in the lower portion of the belt insertion portion 4 appear.
The upper end portion 2 has a vertical band 1a, a horizontal band 2b ₁ extending in the horizontal direction at the upper end of the upper end 2, and three horizontal bands 2b ₂ arranged in parallel at predetermined intervals below the horizontal band 2b ₁ by vertical band 1a and horizontal band 2b _1, 2b ₂ and is woven in the directions perpendicular to each other, it is formed in a net shape having a homogenous eyes 2c. As shown in FIG. 4, the vertical band 1 a is the same member as the vertical band 1 a constituting the inward portion 1.

  The upper end portion 2 is a portion within 5 cm in the vertical direction from the upper end of the windproof snow net 10, preferably a portion within 3 to 6 cm, and more preferably a portion within 4 to 5 cm. When the upper end portion 2 has the width, sufficient connection strength can be obtained when the net 10 is fixed to the lateral frame 11 b.

Horizontal band 2b ₁ is thicker than the lateral belt 1b which constitutes the inner part 1, the width of the lateral band 2b ₁ shown in _{W 3} being 4, is preferably 10 to 40 mm, is 15~30mm Is more preferable, and 20 to 25 mm is more preferable.
If lateral belt portion 2b ₁ is 10mm or more, cutting by snow load when precipitated with snow load, it becomes difficult to bend.
Horizontal band 2b ₂ is thinner than the lateral belt 1b which constitutes the inner part 1, the width of the lateral band 2b ₂ shown in _{W 4} in FIG. 4 is preferably 1 to 5 mm, 1.5 to 4 It is more preferable that it is 0.5 mm, and it is more preferable that it is 2 to 4 mm.
Horizontal band 2b ₂ is preferably in a plurality of, there are preferably three or more. If the horizontal band 2b ₂ is 5 mm or less and three or more, the insertion location can be changed according to the length of the fixing member 13, so that the net 10 is tensioned without tension. 10 is preferable because it can be stretched. Further, when the nets 10 are arranged in multiple stages in the vertical direction, since the upper and lower bands can be connected, tension can be applied to the entire surface without providing a gap.
It vertical spacing between the horizontal band 2b ₁ and the lateral band 2b ₂ shown in _{D 3} in FIG. 4 is identical to the spacing between the lateral belt 2b ₂ adjacent, the spacing is 2~6mm Is preferred. The distance D ₃ at 6mm or less, by providing a multi-stage, it is possible to change the delicate fixed position.

At the upper end 2, between the horizontal band 2b ₂ and the adjacent lateral zone 2b _1, and, between the lateral belt 2b ₂ adjacent the fibers are woven in a zigzag, the zigzag portion 2d is formed by being coated with a resin Preferably, it is formed. By forming the zigzag portion 2d between the adjacent horizontal bands of the upper end portion 2, it is possible to prevent the deviation of the vertical and horizontal bands at the position of the fixing member to which the force is applied. In addition, since the zigzag portion may insert the fixing member, it is preferable to be thin so as to be insertable.

In the present invention, the total density of the longitudinal bands 1a and the transverse bands 1b at the upper end 2 and the lower end 3 is the sum of the longitudinal bands 1a and the transverse bands 2b ₁ and 2b ₂ at the inward portion 1 of the windproof snow net 10. It is higher than the density. Thereby, the intersection strength of the upper end portion 2 and the lower end portion 3 is enhanced without deteriorating the windproof and snowproofness and visibility as the whole of the windproof and snowproof net 10 caused by the structure of the inner side 1 and settling of snow at the time of snow melting It is possible to provide strength that can withstand the force.

  The aperture ratio of the inward portion 1 of the windproof and snow protection net 10 of the present invention is 40 to 55%, preferably 40 to 50%. When the opening ratio of the inward portion 1 of the windproof and snowproof net 10 is within the above range, the windproof and snowproof effect can be enhanced. The windproof and snowproof net 10 of the present invention can be particularly preferably used as a windproof or windproof windproof and snow fence.

In the present invention, as described above, as the horizontal distance D ₁ of the vertical band 1a in the inner part 1 is larger than the distance D ₂ in the vertical direction of the transverse strip 1b, the vertical band 1a and the horizontal band 1b By interlacing, a rectangular eye 1c having a long side in the horizontal direction and a short side in the vertical direction is formed. When the eyes of the inward portion 1 are square, when the wind is blown from an oblique direction with respect to the direction perpendicular to the surface direction of the windproof and snowproof net 10, the aperture ratio is apparently smaller than the above range, The windbreak and snow protection effect was sometimes lost. According to the present invention, since the eyes 1c of the inward portion 1 are rectangular with the long side D ₁ and the short side D ₂ , in the horizontal direction with respect to the direction perpendicular to the surface direction of the windproof snow net 10. When blowing snow from the inclined direction, it is possible to suppress the apparent decrease in the opening ratio, and the windproof and snow-breaking effect is less likely to be lost against blowing snow from the front or the rear in the traveling direction of the road. In addition, when the viewer passing the road looks at the windproof and snow protection net 10 located forward or backward in the traveling direction of the road, the visibility is less likely to be impaired.

In the above embodiment, the horizontal band with the upper end, an example is shown comprised of a thin three horizontal bands 2b ₂ Metropolitan than a single horizontal band 2b ₁ and the lateral bands 1b thicker than the lateral zones 1b, the present invention Is limited to the total density of the vertical bands 1a and the horizontal bands 2b ₁ and 2b _{2 at} the upper end 2 if it is higher than the total density of the vertical bands 1a and the horizontal bands 1b in the inner portion 1 not, for example, only horizontal band 2b ₁ may be in the form of multiple parallel vertically above interval D _3.

  Between the inward portion 1 and the upper end portion 2, a belt insertion portion 4 for inserting and holding the belt 12 shown in FIGS. By inserting the belt 12 into the eye 4c of the belt insertion portion 4 and winding it around the lateral frame 11b, the upper portion of the windproof and snowproof net 10 is fixed to the frame 11.

Vertical width of the belt insertion portion 4 shown in _{D 4} in FIG. 4 is preferably 15 to 30 mm, more preferably 17～28Mm, more preferably from 20 to 25 mm. When the width in the vertical direction of the belt insertion portion 4 is within the above range, a space for inserting the belt 12 can be secured without impairing the windproof and snowproof effect.

In the present invention, the longitudinal band 1a, the transverse bands 1b, 2b ₁ and 2b _{2 and} the zigzag portion 2d are made of resin after being woven into a mesh-like fiber made of a synthetic resin to obtain a mesh-like substance. As a member which comprises a windproof snow net, it can be integrally obtained by impregnating.
Examples of the synthetic resin fibers used in the present invention include polyester fibers, nylon fibers, polyolefin fibers, aramid fibers and the like, and polyester fibers are preferably used because they are excellent in strength and durability.
The kind of resin to be impregnated can be appropriately selected according to the required strength and the like, and examples thereof include vinyl chloride resin, urethane resin, ethylene / vinyl acetate copolymer resin and the like. Among them, an acrylic resin is preferable from the viewpoint of improving the weather resistance. Further, in order to enhance the weather resistance, it is preferable that an ultraviolet absorber such as black carbon be further added to the resin.

  The method of weaving the mesh-like material is not particularly limited, but it is preferable to be woven by entanglement or russell knitting from the viewpoint of preventing the strength of the intersection between the longitudinal and lateral bands and the displacement of the intersection. The mesh-like material differs from the windproof and snow-proof net in that it is not impregnated with resin, and the shape of the mesh-like material is substantially the same as the shape of the windproof and snow-proof net. Therefore, by weaving the mesh-like material into a desired shape, it is possible to obtain a windproof / shrouding net of a desired shape that satisfies an aperture ratio etc. described later.

A dip coating method, a roll coating method, a spray coating method etc. may be mentioned as a method of impregnating the resin into the mesh-like material, and among them, the dip coating method is used from the viewpoint of controlling the amount of resin adhesion to secure durability. Is preferred.
When the dip coating method is used, the mesh-like material can be efficiently impregnated with the resin by immersing the mesh-like material in an acrylic resin emulsion at normal temperature and then drying the resin emulsion at 100 ° C.

(Frame 11)
The frame 11 is a member for stretching the windproof and snowproof net 10. The shape and material of the frame 11 can be appropriately selected according to the place where the windproof and snow fence net fence 20 of the present invention is installed and the amount of snow accumulation. For example, when temporarily installing only in the winter season, the frame 11 can be simply formed by combining single-pipes used in a construction site or the like. Moreover, when installing in the area with much snowfall amount, you may use the frame of the foundation type which embedded the lower part of a high-strength support | pillar in the earth. In addition, although the form which the flame | frame 11 has the vertical frame 11a and the horizontal frame 11b was shown in FIG.1, 2, when the intensity | strength which can endure the sedimentation force of the snow at the time of snow melting is obtained only by the vertical frame 11a. The horizontal frame 11b is not necessarily required, and the windproof and snow protection net 10 may be fixed only to the vertical frame 11a by a method described later.

(Belt 12)
The belt 12 is a member which is inserted into the eye 4c of the belt insertion portion 4 of the windproof and snowproof net 10 and is wound around the horizontal frame 11b to fix the upper portion of the windproof and snowproof net 10 to the horizontal frame 11b. . By passing the belt 12 through the lower portion (belt insertion portion 4) of the upper end portion 2 where the strength at the intersection is high due to the density being higher than the inner portion 1, the settling force of snow at the time of snow melting is resisted. It is possible to increase the strength obtained. The belt 12 can be made of, for example, polypropylene. When the frame 11 does not have the lateral frame 11 b, the belt 12 is not an essential component.

(Fixing member 13)
Next, the fixing member 13 will be described with reference to FIG. The fixing member 13 is a member for fixing the horizontal side end of the windproof and snowproof net 10 to the vertical frame 11a.
The fixing member 13 includes an attaching member 13a, a pulling member 13b, and a spiral 13c. The attachment member 13a is a member for attaching the pulling member 13b to the vertical frame 11a. The shape and material of the mounting member 13a are not particularly limited as long as the function and function can be achieved, but it is preferable to have a bolt 13ab for adjusting the horizontal position of the pulling member 13b. Since the mounting member 13a is provided with the bolt 13ab, the windproof / shrouding net 10 is extended with time, and even if it hangs down, the pulling member 13b is pulled toward the vertical frame 11 by tightening the bolt. The tension of the snow protection net 10 can be maintained. The pulling member 13b is a member that is wound integrally with the side end of the windproof snowproof net 10 by the spiral 13c, thereby fixing the side end of the windproof snowfall net 10 to the frame 11a and applying tension. The shape and material of the pulling member 13b are not particularly limited, but it is preferable to be cylindrical from the viewpoint of reducing the gap with the spiral 13c and suppressing the deformation of the spiral 13c. The spiral 13 c has a spiral shape, and the side end of the windproof and snowproof net 10 is fixed to the pulling member 13 b by winding so that the side end of the windproof and snowproof net 10 and the pulling member 13 b are integrated. Member. The material of the spiral 13 c is not particularly limited, but can be made of, for example, a plated iron wire or stainless steel from the viewpoint of strength and processability.

  By combining the above-described members, the windproof and snowproof net fence 20 of the present invention can be manufactured.

As shown in FIGS. 1 and 2, an opening 14 is formed in the lower part of the windproof and snow fence net fence 20, and the windproof and snow fence net 10 has a predetermined distance from the ground (shown by H in FIG. 2). Is attached to the frame 11. By providing the lower part 14 of the windproof snow net fence 20, the air pressure is reduced by increasing the wind speed near the ground, and the leeward snow that has passed through the net is sucked out near the low pressure ground, thus the driver's eyes The effect of reducing the number of snow particles passing through the height can be obtained, and the visibility disturbance at the time of snowing can be significantly improved. On the downwind side of the fence, there are few blow-offs in the range of about the height of the fence, and a blow off effect can be obtained. Therefore, the net fence 20 for windproof and snow protection having an opening at the lower part can be used as a windproof and windproof snow protection fence.
From this point of view, the distance H between the windproof and snowproof net 10 and the ground is preferably 0.3 to 1.3 m, more preferably 0.4 to 1.2 m, and 0.5 to 1. More preferably, it is 1 m.

<Net fence 30 for windproof and snow protection>
Next, a net protection fence 30 for windproof and snow protection according to a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a view of the windproof snow net fence 30 as viewed from the same point as FIG. 2. As shown in FIG. 6, the windproof and snow-proof net fence 30 has a structure in which a windproof and snow-proof net 10 'is stretched between foundation type vertical frames 15, 15 partially embedded in the ground. ing. The windproof and snowproof net 10 'has the same upper end 2 and lower end 3 as the windproof and snowproof net 10, and an inward portion 1' whose width in the vertical direction is wider than the inward portion 1 of the windproof and snowfall net 10. And is stretched over substantially the entire height of the vertical frame 15. Thus, a large windproof effect can be obtained by stretching the windproof and snowproof net 10 'on substantially the entire surface including the lower part of the windproof and snowproof net fence 30. Therefore, compared to the first form, when you want to obtain a windproof effect as large as possible, or when you want to expect a more effective windbreak effect, an area where the amount of snow coverage is not large (a place where the snow fence is not buried with snow) Can be used more preferably.

<Net fence 40 for windproof and snow protection>
Next, a net protection fence 40 for windproof and snow protection according to a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a view of the windproof snow net fence 40 as viewed from the same point as FIG. As shown in FIG. 7, in the windproof and snowfall net fence 40, the same windbreak and snowfall net 10 as the windproof and snowfall net fence 20 is stretched between the vertical frames 15, 15 identical to the windbreak and snowfall net fence 30. The non-porous plate 16 is installed under the windproof and snow-proof net fence 10, and the lower part of the windproof and snow-proof net fence 40 is completely shielded. As described above, the non-perforated plate 16 is installed under the windproof / shrouded net fence 40 and shielded to prevent snow from being captured by the fence as much as possible, or from the sedimentation pressure generated by snow deposited near the fence We can protect the fence. Therefore, compared with the first embodiment and the second embodiment, it can be more preferably used in heavy snowfall areas where the amount of snowfall is large. Although the material of the non-porous plate 16 is not particularly limited, for example, a steel plate can be used.

  EXAMPLES Hereinafter, examples of the present invention will be described, but the scope of the present invention is not limited by the following examples.

[Measurement of windbreak effect]
Example 1
A net corresponding to the inward portion of a windproof and snowproof net having a vertical band (width 6 mm, interval 15 mm) and a horizontal band (width 6 mm, interval 15 mm) coated with acrylic resin on a mesh made of polyester fibers A member (width 500 mm in the vertical direction, width 500 mm in the horizontal direction, aperture ratio 50%) was produced.
The net member was stretched on a frame produced by combining steel, and a net fence model according to Example 1 was produced and disposed on the front of the wind tunnel tester.
Applying wind speeds of 20 m / s, 30 m / s, 40 m / s, 50 m / s from the direction perpendicular to the surface direction of the net member, the wind speed from 250 mm to 2500 mm 250 mm from the center of the net fence model The measurement was made every time, and the wind speed ratio on the downwind side when the wind speed on the windward side was 100% was calculated. If the wind speed ratio is 20% or less, it can be said that the windproof effect is high. The results are shown in FIG.

Comparative Example 1
A net member (vertical width 500 mm, horizontal width 500 mm, aperture ratio) having a net member in a longitudinal band (width 1.8 mm, spacing 1.8 mm) and a transverse band (width 1.8 mm, spacing 2.0 mm) A net fence model according to Comparative Example 1 was produced in the same manner as in Example 1 except that it was changed to 26%, and the wind speed ratio was calculated. The results are shown in FIG.

Comparative Example 2
A net member (vertical width 500 mm, horizontal width 500 mm, aperture ratio 60%) having a longitudinal band (width 4.0 mm, spacing 15 mm) and a transverse band (width 4.0 mm, spacing 15 mm) A net fence model according to Comparative Example 2 was produced in the same manner as in Example 1 except that the change was made, and the wind speed ratio was measured. The results are shown in FIG.

[result]
From FIG. 8, in the net fence model of Example 1 having an aperture ratio of 50%, the wind speed ratio is 20% or less at any distance from 500 mm to 2000 mm from the net, and the windproof effect is particularly important. it was high.
From FIG. 9, in the net fence model of Comparative Example 1 in which the aperture ratio is 26%, the windproof effect decreases as the distance from the net fence increases, and the wind speed ratio is 20% or less when the distance from the net becomes 1000 mm or more Could not keep up.
From FIG. 10, in the net fence model of Comparative Example 2 in which the opening ratio is 60%, the wind speed ratio is 20% or more at all wind speeds in all measurement positions, and a high windproof effect can not be confirmed.

DESCRIPTION OF SYMBOLS 1 inner part 1a vertical band 1b horizontal band 2 upper end 2b ₁ and 2b ₂ horizontal band 3 lower end 4 belt insertion part 10 windproof anti-snow net 11 frame 11a vertical frame 11b horizontal frame 12 belt 13 fixing member 13a attachment bracket 13b tension bracket 13c spiral 14 opening 15 vertical frame 16 no hole plate 20, 30, 40 windproof snow net fence 21 road 22, 23 side edge

Claims (4)

It is a net for windproof and snow protection which is made by impregnating a mesh-like material made of synthetic resin fibers with a resin and having vertical and horizontal bands,
The density of the horizontal band at the upper end and the lower end which are each within 5 cm from the upper end and the lower end of the windproof and snowproof net is higher than the density of the horizontal band at the inner side of the windproof and snowproof net and A vertical spacing of the lateral bands at the upper end and the lower end is smaller than a vertical spacing of the lateral bands at the inward portion;
The aperture ratio of the inner portion of the windbreak snow nets is Ri 40-55% der,
In the inner portion, the vertical band and the horizontal band are interwoven to form a rectangular eye having a long side in the horizontal direction and a short side in the vertical direction.
Windproof snow protection net that is characterized. The horizontal interval of the vertical bands in the inward portion is 15 to 30 mm, and the vertical interval of the horizontal bands is 5 to 20 mm,
And the vertical direction space | interval of the said horizontal band in the said upper end part and the said lower end part is 2-6 mm, The net for windproof snow protection of Claim 1 characterized by the above-mentioned.   Between the adjacent horizontal bands at the upper end portion and the lower end portion, a zigzag portion in which the fibers are woven in a zigzag shape and covered with the resin is formed. Or the net for windproof snow protection as described in 2.   A net fence for windproof and snow protection using the windproof and snow protection net according to any one of claims 1 to 3.