JP4478641B2 - Snow fence - Google Patents

Description

    This invention has all fields related to snow protection equipment as its technical field, as well as the field of providing snow protection fences, as well as the fields for providing and selling equipment and equipment necessary for its manufacture and installation. To the materials required for these materials, machinery and equipment, such as wood, stone, various fibers, plastics, various metal materials, etc., electronic components incorporated in them, and control related integration Fields generally referred to as industrial machinery, such as the field of equipment, the field of various measuring instruments, the field of the equipment, the power machine that moves the instrument, the field of electric power and energy as the energy, the field of oil, , Test and research these facilities and instruments, fields related to their display, sale, import and export, generals, the results of their use and the facilities and instruments to build them There are no unrelated technical fields, such as the fields related to the collection and transportation of garbage waste generated by the operation of the system, the recycling field that efficiently recycles the waste refuse, and the new fields that cannot be envisaged at this time. It is about.

(Points of interest)
In Japan, although the latitude is relatively low, seasonal wind blowing from the continent in winter caused a snow cover in a wide area of the country. There is a risk of profits, especially in snowy areas, when the handle is taken by a kite, the field of view is suddenly closed due to the deterioration of the field of view due to a snowstorm, the local snowstorm that occurs locally, or the snow smoke that the front vehicle rolls up As the risk of frequent accidents increases due to various factors, etc., various types such as sump fences, blow-off fences, blow-off fences, blow-off prevention fences, etc., are provided to ensure safety on the road. It is selected and installed according to the weather conditions, roadside environment, road structure, etc. of the installation location.

    As shown in the front view of the road where the conventional snow fence is installed in FIG. 13, the general snow fence F is erected at a predetermined interval along the road side which is the windward side of the snowstorm on the road W. A plurality of pillars 5, 5,..., And spans between these pillars 5, 5,..., Form a vertical wall surface in the range from near the ground to near the middle of the top and bottom, and toward the upper side, It is composed of a plurality of windproof snowboards 4, 4,... Fixed so as to support a posture inclined toward the road W (leeward side), and are indicated by solid line arrows B, B,. As described above, the wind and snow blown from the horizontal direction to the snow fence F is blown onto the vertical wall surface from the vicinity of the ground to the vicinity of the middle of the top and bottom, and is blocked at a stretch and flows out vertically and horizontally along the wall surface. The air pressure increases and the wind pressure component toward the ground loses escape. Since the snow fence F is installed along the road W to some extent, the wind pressure component toward the horizontal direction will lose its escape, and will flow out upwards with the lowest resistance. Windproof snowboards 4, 4,... Increase the wind speed through the upper edge and form a flow over the upper side of the road W.

    However, as shown in FIG. 13, the wind and snow B trying to pass through the upper edge of the snow fence F cannot be smoothly peeled off due to the frictional resistance with the wind snow plates 4, 4. Eddy current is generated, and this eddy current generates negative pressure on the leeward side and winds down the snowstorm B that attempts to pass almost horizontally above the snow fence F. The two lanes in FIG. Even if the windward lane provides a sufficient snow protection effect, snow smoke may fall on the lane located on the leeward side, deteriorating the field of view and causing snow and freezing on the road surface. In addition, the entire width of the road W including the sidewalk along the road may not be sufficiently snow-protected.

(Conventional technology)
Among them, as a measure to overcome the problem, for example, as proposed in Japanese Patent Application Laid-Open No. 2005-232957 “Snow-proof fence for snowstorm”, a plurality of snow-proofs are provided between pillars on both sides. The plate is provided in a multi-stage and foldable manner, and on the uppermost snow protection plate, a wind direction blowing plate that changes the wind direction and blows and blows it is arranged so that it can be tilted by several steps, and the inflow wind angle is 45 ° to right angle It is adaptable to snowstorms, and is formed in a barrier that crosses the road by blowing up while changing the wind direction, and can be applied to wide roads, or disclosed in Japanese Patent Application Laid-Open No. 2004-218393. As in the case of the “rotating type wind-up fence”, a plurality of rectifying plates having a downward inclination angle with respect to the windward side are provided between a plurality of supporting columns, with a link structure that can be expanded and folded. As provided, as having the folding means and the inclination angle holding means of the current plate guides the wind and snow to pass over the fence, and the like are scattered a drift on the road those possible exclusion.

However, the former "snow wind-resistant snow fence" invention is a conventional type when the wind and snow passes through the upper edge, which is the leeward side of the wind draft plate arranged on the top snow guard plate itself. It is inevitable that the same vortex flow as that of snow fences in Japan will be unavoidable. If a wind draft plate is added on top of the conventional snow fence, and the height is not increased, the snow protection area should be expanded. As a result, it has the disadvantage that the snow fence becomes larger and more complicated, and the latter “rotating type wind-up fence” has multiple rectifications from the ground to the top. It is designed to pass a snowstorm over almost the entire surface of the fence and guide it upward, but vortex flow still occurs at the rear end of all the rectifying plates and passes above There is a high risk of causing the phenomenon of wind and snow to fall and the porosity is high. Min was achieved, leaving a disadvantage that occurs the windward side of Yukikemuri hoisting or snow accretion in lanes adjacent to the fence upflow is concerned.
(1) JP 2005-232957 A (2) JP 2004-218393 A

(Awareness of problems)
As described above, in the previously proposed “snow wind-resistant snow fences” and “rotating type wind-up fences”, etc., both the wind draft plate and the rectifying plate with the leeward side inclined upward, If the wind and snow that is blown are guided upward and compared to the wind-proof snow fence, it is possible to fly farther to the leeward side. The problem of generating eddy currents on the leeward side, wrapping down the wind and snow that tries to pass the upper side of the snow fence, and narrowing the snow protection range is not solved, and trying to prevent a wider area by the structure as it is As a result, the vertical dimension of the snow fence must be set higher, resulting in a new problem that the installation, assembly before and after the winter period, and the number of man-hours and expenses for the folding work are greatly increased. There.

(Object of invention)
Therefore, the present invention greatly reduces the phenomenon of wind and snow entanglement at the upper end of the fence even when the installation height is about the same as the conventional type without causing new problems, and extends over a wider range on the leeward side. As a result of judging whether it is possible to develop a new snow protection technology that can demonstrate the snow protection effect, we started its development and research very quickly, and repeated many years of trial and error, many trial productions, and experiments, This time, it finally succeeded in realizing a snow fence with a novel structure, and the configuration thereof will be described in detail below together with an embodiment representing the present invention shown in the drawings.

(Structure of the invention)
As clearly understood from the embodiments representing the present invention shown in the drawings, the snow fence of the present invention basically comprises the following configuration.
That is, each support column erected at a predetermined interval is used as a support portion, and a windbreak snowboard and a guide swash plate located on the upper end side thereof are horizontally placed and spanned between them, and the range extending from near the ground to the upper end thereof. The space between the columns is divided into the leeward side and the leeward side, and the wind is bent or bent to the leeward side at a predetermined vertical width that is higher than the middle position in the vertical direction and lower than the guide swash plate. The reverse rectifying plate whose upper side is concave is laid sideways in a posture in which its upper edge is regulated so as to be shifted slightly leeward than the lower edge, while from the vicinity immediately above the upper edge of the reverse rectifying plate. Above, there is a snow fence with the gist of the structure in which the guide swash plate is provided on the leeward side in an appropriately inclined manner.

    In other words, the snow fence made of this basic structure is each supporting column that is erected at a predetermined interval, and the wind proof snow plate and the guide swash plate located on the upper end side are placed horizontally between them, The struts in the range from near the ground to near the upper end are divided into the windward side and the leeward side, and the upper and lower predetermined width portions that are higher than the middle position in the vertical direction and lower than the guide swash plate The rectifying plate is bent or bent to the leeward side and the leeward side is concave, and the upper end edge of the reverse rectifying plate is set in a posture restricted so as to be shifted slightly to the leeward side from the lower end edge, The induction swash plate should be installed in an angle-tilt posture on the leeward side from right above the upper edge of the reverse rectifying plate, and below the wind and snow blown directly on the reverse rectifying plate. Wind rising along the windbreak snowboard Inverted and raised along the concave surface, and rectified so as to go to the upper side of the induction swash plate, so that the windbreak snow range on the leeward side from the column standing position can be expanded further to the leeward side. It becomes the snow fence which consists of composition.

    If these configurations are shown as more specific, each support column standing at a predetermined interval is used as a support portion, and a windbreak snow plate and a guide swash plate located on the upper end side thereof are horizontally installed, spanned, The struts in the range from near the ground to near the upper end are divided into the windward side and the leeward side, and the upper and lower predetermined width portions that are higher than the middle position in the vertical direction and lower than the guide swash plate Inverted rectifying plate that is bent or bent to the leeward side and has a concave side on the leeward side to a 1/2 to 1/10 cut cylinder type, and its upper edge is regulated so that it is shifted slightly leeward from the lower edge. The guide swash plate is configured so that the guide swash plate is provided in an angle inclined posture on the leeward side from above and above the upper edge of the reverse rectifying plate. It becomes a snow fence.

    Similarly, each strut erected at a predetermined interval is used as a support portion, and a windbreak snowboard and a guide swash plate located on the upper end side are horizontally placed between them, spanned, and the range from the vicinity of the ground to the upper end thereof is set. The space between the columns is divided into the leeward side and the leeward side, and the wind is bent or bent to the leeward side at a predetermined vertical width that is higher than the middle position in the vertical direction and lower than the guide swash plate. An inverted rectifying plate having a concave shape on the upper side and having a roughly ½ to 1/10 cut cylindrical shape is regulated to an angular attitude of 89 ° to 80 ° with its upper edge inclined slightly leeward from the lower edge. On the other hand, it is possible to provide a snow fence in which the guide swash plate is installed in a suitable angle inclined posture on the leeward side from directly above and above the upper edge of the reverse rectifying plate. It is.

    More specifically, each support column erected at a predetermined interval is used as a support part, and a windbreak snowboard and a guide swash plate positioned on the upper end side are horizontally placed between the support slats, and from near the ground to the upper end. The range of struts is divided into the leeward side and the leeward side, and is bent or bent to the leeward side at a predetermined vertical width that is higher than the middle position in the vertical direction and lower than the guide swash plate. Then, the inverted rectifying plate having a substantially roll-over 1/2 to 1/10 chopped cylindrical shape with a concave on the leeward side has an angle attitude of 89 ° to 80 ° with its upper edge inclined slightly leeward from the lower edge. The guide swash plate is inclined at an angle of 45 ° to 80 ° to the leeward side in the range of 400 to 1500 from the vicinity immediately above the upper edge of the reverse rectifying plate. A snow fence with a horizontal structure That.

    As described above, according to the snow fence according to the present invention, it is higher than the windbreak snowboard disposed at the middle position in the vertical direction from the ground between the columns, the guide swash plate located on the upper end side, and the middle position in the vertical direction. By arranging the reversal rectifying plate in the upper and lower predetermined width portions corresponding to the lower part than the induction swash plate and partitioning it on the windward side and leeward side, the snowstorm that blows directly toward the reverse rectifying plate is A wind-snow component whose wind direction is reversed in this way will be reversed and guided in a slanted upward direction with a predetermined angle on the windward side along the curved or bent windward concave rectifying surface of the reverse flow straightening plate. Both wind and snow blown from the windward and wind and snow rising by colliding with the windbreak snowboard are separated to the windward side, reducing the wind pressure and air resistance applied to the induction swashplate located above it, Upper edge of the board It is possible to reliably prevent the occurrence of eddy currents on the leeward side, and the wind and snow that has been redirected upward by the reversal rectifying plate to rise along the windbreak and snow plate. The wind and snow component to be blown directly from the windward to the induction swash plate is directed upwards inclined to the windward side, and the overall wind direction of the wind and snow near the upper edge of the induction swash plate Since the vector will be tilted upward on the leeward side, it is possible to set a virtual snow flaking point at a higher position than the actual height of the snow fence, compared to the conventional snow fence. Since it is possible to blow wind and snow farther to the leeward side at a higher position, it is possible to obtain an excellent feature that the leeward side snow protection range can be expanded without extending the overall height of the snow fence.

    In addition, the inversion rectifying plate is a concave-shaped rough rollover 1/2 to 1/10 cut cylinder type, and its upper end edge is restricted to an angular attitude of 89 ° to 80 °, which is inclined slightly leeward than the lower end edge. Therefore, the wind and snow in the horizontal direction from the windward will be smoothly reversed and guided toward the upper side of the vertical direction or obliquely upward toward the windward side, generating unnecessary turbulence and eddy currents. This makes it possible to realize efficient rectification by suppressing the wind and snow, and it is possible to widen the snow protection range by reliably flying the wind and snow at a higher position.

    Then, the induction swash plate is horizontally installed in a range of 400 to 1500 in the upper part from the vicinity immediately above the upper edge of the reverse rectifying plate so that the upper end is inclined at an angle of 45 ° to 80 ° to the leeward side. According to this, a part of the wind that is reversed and guided substantially vertically upward or obliquely upward toward the windward side by the reverse rectifying plate prevents other winds and snows from blowing strongly against the windward wall surface of the induction swash plate. In the up-and-down range without losing its effectiveness, it is possible to guide in the upward direction on the leeward side, eliminate the entanglement phenomenon on the leeward side of the upper edge of the induction swash plate and make the wind and snow fly higher and far away, and the snow prevention range It can be expanded.

    The induction swash plate is formed from a plurality of bent plates having a substantially "<"-shaped cross section combined with a longitudinal cross-sectional waveform, and the rising inclination angle with respect to the horizontal of the lower rectifying surface toward the windward of each bent plate is 75 When installed in an angle of 85 ° to 85 °, the wind and snow blown to the windward side of the “<”-shaped cross section is guided to turn upward and obliquely upward and slant to the windward side. Compared to the case of a flat plate-shaped induction swash plate, the rectification function of the inverted rectification plate is strengthened. This makes it possible to prevent the air from being entrained and to reduce the frictional resistance with the air flow to achieve smooth guidance.

    Further, the reverse rectifying plate is formed from a plurality of bent plates having a substantially "<"-shaped cross-section combined with a longitudinal cross-sectional waveform, and the rising inclination angle with respect to the horizontal of the upper rectifying surface toward the windward of each bent plate, By incorporating it in an attitude of 30 ° to 70 °, the concave surface facing the windward side of the “く” shaped cross section receives the snowstorm and attenuates the turbulent flow component contained in the airflow. It can be absorbed and guided along the upper rectifying surface and released to function as a reverse rectifying plate, and moreover, a plurality of bent plates can be mounted within a predetermined angular range. By combining the structures so as to fit, there is an advantage that the manufacturing cost can be significantly reduced as compared with the case of manufacturing a part having a circular section with a constant radius.

    Then, a windproof snow plate disposed below the induction swash plate and the reverse rectifying plate is formed from a plurality of bent plates having a generally “<”-shaped cross section combined with a longitudinal waveform, and the wind of each bent plate According to the structure in which the rising inclination angle of the upper rectifying surface toward the horizontal is restricted to a posture of 50 ° to 60 °, as in the above-described induction swash plate and the reverse rectifying plate, Receiving snowstorm in the concave shape toward the windward side of the mold cross-section, attenuates and absorbs turbulent components contained in the airflow, and guides and releases along the upper rectifying surface set within the above angle range, upward The snow blown toward the reversal rectifying plate and the induction swash plate arranged on the side is pressurized from the lower side and guided upward, so that the blown snow can be guided more smoothly toward the upper side of the snow fence. It will be.

    In addition, if the windbreak snowboard arranged below the induction swash plate and the reverse rectifying plate is made of a keystone plate with a corrugated longitudinal section, a bent plate with a generally “<”-shaped cross section as described above is used. Compared to the case of combining multiple sheets, it can absorb some turbulent flow and can be greatly reduced in cost. Furthermore, it is placed below the induction swash plate and the reverse rectifying plate. If the windbreak snowboard is fixed in a posture inclined at 89 ° to 80 ° with respect to the horizontal with its upper end facing leeward, the snowstorm blown on the snowbreak fence is connected to the reverse rectifying plate disposed above and The guide is more reliably and promptly directed toward the induction swash plate side, and in particular, the wind speed when passing near the upper edge of the induction swash plate is further increased, and the effect of further improving the snow prevention effect is achieved.

In implementing the present invention having the above-described configuration, the best or desirable mode will be described.
The support column functions to support the induction swash plate, the reverse rectifying plate, and the windproof snow plate at a predetermined height position at a predetermined posture angle, and two or more of them are plate-shaped. It shall be installed with sufficient strength at a predetermined interval that can support the parts in a spanning manner, and can be installed in the winter period when a snow fence is required. It is desirable to have a structure that can be folded or disassembled during the period.

    The guide swash plate can guide the wind and snow blown directly from the windward and the wind and snow that is inverted by the reverse guide plate arranged below and is directed upwards slightly upward toward the leeward side. And must be placed either directly above the upper edge of the reverse rectifier plate or directly above the leeward side or above the upstream side, and as shown in the examples described later, It is desirable to be fixed at an angle inclined position of 45 ° to 80 ° on the leeward side in the range of 400 · 1500 · above the upper edge of the plate. If the air flow guide action is hardly obtained, and if the dimension is set to exceed 1500, the reversal air flow from the reversal induction plate blows again on the induction swash plate, and the eddy current and the accompanying entrainment occur on the leeward side of the upper edge. In the inclined posture of 45 ° or less, the vortex flow is encouraged to occur, and in the inclined posture of 80 ° or more, the upper end edge is sufficient. Therefore, there is a drawback in that it is difficult to separate the airflow.

    In addition, the induction swash plate is composed of a plurality of substantially “<”-shaped cross-section bent plates combined in a longitudinal cross-sectional waveform, as shown in the embodiments described later, and the lower side toward the windward of each bend plate It is possible to incorporate the rising inclination angle with respect to the horizontal of the rectifying surface into a posture of 75 ° to 85 °, and when the rising inclination angle of the upper rectifying surface of each bent plate is set to less than 75 °, The action of reversing toward the upper side is too strong, and it will return and reduce the blowing speed of the snowstorm. If the inclination angle exceeds 85 °, the turbulence component of wind and snow can be removed sufficiently. In addition, it has the property of causing the disadvantage that the stability of the airflow cannot be secured.

    The reverse rectifying plate reverses and guides the wind and snow blown to an appropriate range that is higher than the middle position in the vertical direction of the snow fence, and is disposed above it. This reduces the pressure of wind and snow on the induction swash plate and prevents the phenomenon of eddy currents and air entrainment on the leeward side of the top edge of the induction swash plate. It must be bent or bent so that the windward side is concave, and the upper edge of the windward side is set so as to be displaced slightly to the leeward side of the lower edge. As shown, it should be roughly roll-over 1/2 to 1/10 cut cylinder type, and if it exceeds 1/2 cut cylinder type, the concave opening area cannot be secured sufficiently and the inflow resistance increases. Such as wind noise and vibration. Can not be obtained performance, also equal to 1/10 cutting off tubular short arc or bent shape than the ones there arises a drawback that can not perform a sufficient reversal effect of the airflow.

    In addition, as shown in the examples described later, the reverse rectifying plate is formed from a plurality of bent plates having a generally “<”-shaped cross section combined with a longitudinal cross-sectional waveform, and the upper side of each bent plate facing upwind. The rising slope angle with respect to the horizontal of the rectifying surface can be incorporated in an attitude of 30 ° to 70 °. When the rising inclination angle with respect to the horizontal of the upper rectifying surface is set to be less than 30 °, the windward of the snowstorm The reversal toward the wind speed is too strong, and the induced wind speed is reduced, and if it exceeds 70 °, sufficient reversal is not obtained, and the wind pressure blown to the induction swash plate is increased, and the induced oblique speed is increased. This will cause a phenomenon in which eddy currents and wind / snow entrainment occurs on the leeward side of the upper edge of the plate.

    The windbreak snowboard divides the area below the reversal rectifying plate between the struts into the windward side and the leeward side, shielding the wind and snow from the windward side and making most of the wind and snow sprayed This function serves to guide the air to escape upward with the reverse rectifier plate and induction swash plate, and can withstand the blowing pressure of wind and snow as well as the reverse rectifier plate and induction swash plate. As shown in the examples to be described later, each of the bending plates is formed of a plurality of substantially “<” shaped cross-section bending plates combined in a longitudinal section waveform. It is possible to incorporate a rising inclination angle with respect to the horizontal of the upper rectifying surface toward the windward into a posture of 50 ° to 60 °, and at this time, a rising inclination angle with respect to the horizontal of the upper rectifying surface. If the degree is set to less than 50 °, the wind and snow that has been blown will be reversed to the windward side, and the rising speed of the wind and snow will be reduced. As a result, the air flow disturbed by the turbulent flow hinders the smooth flow of the snowstorm that passes near the upper end of the induction swash plate, and the stable blowing performance cannot be obtained. It becomes.

    In addition, it is cheaper than a windbreak snowboard, which is arranged below the induction swash plate and the reverse rectifying plate, formed from a plurality of bent plates having a generally "<"-shaped cross section combined with a longitudinal waveform. Yes, it can be made of a keystone plate with a corrugated longitudinal section with sufficient durability, or it is 89 ° to 80 ° with respect to the horizontal with the upper end of the windbreak snowboard facing downwind It can be tilted and fixed in a posture that allows wind and snow to be directed upwards. At posture angles exceeding 89 °, it is difficult to obtain wind and snow blowing guidance by changing posture, and vertical posture In the case of a posture angle of less than 80 °, it is preferable for turning wind and snow upward, but the bottom spreads to the windward side and is wider than the conventional snow fence. Will exit is a possibility that the results in a disadvantage that becomes necessary.

Each of the induction swash plate, the reverse rectifying plate and the windproof snow plate uses a plate-like member having a cross-sectional structure excellent in wind pressure strength, such as various bent plates and keystone plates formed or combined in a corrugated longitudinal section. It is possible to use a perforated plate with a plurality of small-diameter holes penetrating in the direction of blowing wind and snow in the entire or necessary range of each, such as the weather conditions and topography of the installation location. It is possible to secure a porosity determined to be optimal according to conditions.
In the following, the structure of the present invention will be described in detail together with an embodiment representative of the present invention shown in the drawings.

    The side view of the snow fence shown in FIG. 1, the side view of the snow fence showing the dimensions of each part in FIG. 2, the side view of the snow fence enlarged from FIG. 3, the longitudinal section of the bent plate in FIG. The example shown in the front view of the road where the snow fence is installed and the perspective view of the snow fence shown by the arrow in FIG. 12 shows the props 5, 5,. A windbreak snowboard 4 and a guide swash plate 2 positioned on the upper end side are installed and supported between the support columns 5 and 5 between the ground and the upper end. Inverted with the upper side of the intermediate position in the vertical direction and the lower part of the guide swash plate 2 corresponding to the lower part of the vertical swash plate 2 being bent or bent toward the leeward side so that the windward side is concave. The rectifying plate 3 is restricted so that its upper edge is shifted slightly leeward than the lower edge. On the other hand, the induction swash plate 2 is installed in an inclined posture of an appropriate angle α on the leeward side from the vicinity immediately above the upper end edge of the reversal rectifying plate 3. 1 shows a typical example of a snow fence.

    As shown in FIG. 11 and FIG. 12, the snow fence 1 is provided between each of a plurality of support columns 5, 5,... The windproof snowboards 4, 4,... Are laid horizontally and the windward side and the leeward side are defined, and each column 5, 5,... Is reinforced concrete embedded in each standing position. A base plate 51 is coupled to a base portion (not shown) made of a metal, and a folding mechanism 52 is provided at a height of about 780 · from the ground. To the fall, windbreaking snowboards 4,4, ... removed in the vertical range of about 780. near the ground are stacked horizontally and stacked, and the upper part of each support 5,5, ... It can be folded upside down and stored.

    As shown in FIG. 1 and FIG. 2, each support column 5, 5,... Has an upright column part 53 standing on the leeward side above the base plate 51 and an interval of about 470 · on the leeward side. The arcuate column portion 54 is bent in an arc shape with a radius of R2700 from the approximately 2300-point from the ground toward the leeward side, and the upper end side is erected. In addition to being coupled to the upper end of the support column 53, between the arcuate column unit 54 and the upright support column unit 53, connecting reinforcing plates 55, 55,... It is assumed that they are linked together.

    On the wall surface between the upper and lower ends, which is the windward side of each of the pillars 5, 5,... Adjacent snow guards (not shown) are arranged and fixed in a dotted manner. As shown in FIG. 2, the adjacent struts 5, 5 both have a height of about H2280 from the ground. Windproof snowboards 4, 4 ... 4 made of keystone plates with a rectangular flat shape of about 540 to 630, width of about 3900, and thickness of about 1.6. ... is stretched over a total of four tops and bottoms to form a smoothly continuous wall, and the top end side of the windbreak snowboards 4, 4,. It is assumed that it is temporarily fixed in a posture inclined to the side. Depending on the weather conditions and topography, the entire surface can be made into a closed corrugated plate, and the upper two plates are made into corrugated plate. It can consist of a hole plate.

    As shown in FIG. 2, the windbreak snowboards 4, 4,... Are located on the leeward side of the upper and lower edges from the position just above the leeward corner of the upper edge to about 540. And an inversion rectifying plate 3 having a concave shape with a radius R of about 800 · and an approximately roll-over 1 / 8-cut cylindrical shape is disposed between adjacent struts 5, 5. Temporarily fixed in a spanning manner, the leeward angle θ between the horizontal line HL and the imaginary straight line IL passing through the upper and lower ends of the inversion rectifying plate 3 is set to about 88 °, As shown in FIG. 2 and FIG. 3, the reverse rectifying plate 3 is provided with two upper and lower vertical plates “b” -shaped bent plates 31, 31 arranged vertically with the valley-shaped opening facing the windward side. The rising inclination angle Φ1 with respect to the horizontal line HL of the upper rectifying surface 33 of the bent plate 31 located on the lower side is set to 64. ° is fixed in the posture.

    As shown in FIG. 4, the bent plate 31 has a vertical dimension V of about 260 ·, a length dimension (not shown) of about 3900 · The upper and lower rectifying surfaces 33 and 34 having a length L97 · continuous with the bottom portion 32 are each bent into a generally “<” shape with an opening angle γ1 of 142.1 °, and further, the upper rectifying surface 33 and the lower On the lower end side of the side rectifying surface 34, connection edges 35, 35 each having a vertical length S of about 35 are inclined about 3 to the windward side with respect to the vertical line VL indicated by a broken line in each figure. It is made into the attitude | position made into d, and it integrally molded so that the opening angle (gamma) 2 of the leeward side may be set to 147 degrees with respect to the up-and-down side rectifying surfaces 33 and 34, and between the upper-and-lower connection edges 35 and 35 and the bottom part 32 Is set to about 60 ·.

    Further, from the position slightly upwind of the upper end edge of the reversal rectifying plate 3, upwardly in a range of about 970 ·, as shown in FIG. It is continuous and fixed between the columns 5 and 5 so that the upper end side is inclined at an inclination angle α of about 61 ° from the leeward horizontal line HL in FIG. The upper and lower two induction swash plates 2 and 2 are formed in a substantially plate shape having a longitudinal dimension of 540 and a length dimension of about 3900, respectively. The bent plates 21 and 21 having substantially the same shape and dimensions as those used in the reverse rectifying plate 3 are arranged continuously in the vertical direction, and the upwind and leeward sides are reversed from those used in the reverse rectifying plate 3. As shown in FIG. 3, in other words, the bottom 22 is arranged so as to protrude toward the windward side. The bent plates 21 and 21 are fixed in a posture in which the rising inclination angle Φ2 of the lower rectifying surfaces 24 and 24 with respect to the horizontal line HL is 81.6 °.

    As shown in the side view of the main part of the snow fence in FIG. 5, the snow fence 1 includes windproof snow boards 4, 4,... Arranged below the induction swash plates 2, 2 and the reverse rectifying plate 3. Are formed from a plurality of bent plates 41, 41,... Having a substantially "<"-shaped cross section combined with a longitudinal waveform, and the bottoms 42, 42,. It is arranged so as to protrude, and the rising inclination angle Φ3 with respect to the horizontal line HL of the lower rectifying surface 44 facing the windward of each of the bending plates 41, 41,... Is incorporated in a posture of 54.6 °. Is possible.

The example shown in the side view of the snow fence with the inverted rectifying plate extended in FIG. 6 extends the vertical dimension by greatly expanding the curvature of the inverted rectifying plate 3 in the snow fence 1 shown in the first embodiment. Thus, the vertical range of the windproof snowboards 4 and 4 is reduced.
The side view of the snow fence with the reverse rectifying plate extended from near the ground to near the lower end of the induction swash plate in FIG. 7 is provided from the ground to the lower side of the reverse rectifying plate 3 in each of the above-described embodiments. The windbreak snowboard 4 that had been used was abolished, and the reverse rectification plate 3 with an increased curvature was spanned from the vicinity of the ground to the vicinity of the lower end of the induction swashplate 2, in other words, the reverse rectification of the windbreak snowboard 4 It can be said that the plate 3 has a curvature shape and is integrated.

    The side view of the snow fence formed by combining the reverse rectifying plate and the windproof snowboard of FIG. 8 shows the keystone plate windproof snowboard 4 between the support columns 5 and 5 in a substantially vertical position from the ground. The reversal rectifying plate 3 disposed on the upper side of the induction swash plate 2 is extended to the vicinity of the upper end of the induction swash plate 2 in each of the above embodiments to eliminate the induction swash plate 2. In other words, the induction swash plate 2 having the curvature shape of the reversal rectifying plate 3, and the bent plates 31, 31,... These bottom portions 32, 32,... Are fixed in a posture to project toward the windward side. Furthermore, as shown in the side view of the snow fence with the windbreak snowboard in FIG. 9 inclined, the snowbreak fence in FIG. 8 may have the lower end of the windbreak snowboard 4 greatly inclined toward the windward side. Is possible.

(Operation of Example)
About the snow fence 1 of Example 1 which consists of the above structures, the conceptual snowstorm calculation simulation was performed as follows.
1) Selection of calculation simulation program Use a proven two-dimensional snowstorm simulation model, and calculate with an airflow simulation model and a flying snow diffusion simulation model.
A) Airflow simulation model In the equations of motion 1 and 2 of the two-dimensional flow and the equation 3 of continuity, the topographical section is numerically solved as a boundary condition.

[Equation of motion]

u：風速の水平（ｘ）成分（ｍ/ｓ）
ｗ：風速の鉛直（ｚ）成分（ｍ/ｓ）
ｐ：気圧（Ｐa）
ρ：空気密度（・/ｍ^３）
ＫＸ、ＫＺ：渦拡散係数（ｍ^２/ｓ）
ＫＸ＝ＫＺ＝ｋ u* z
ｋ：カルマン定数（≒０．４）
u*：摩擦速度（ｍ） [Continuous expression]

u: Horizontal (x) component of wind speed (m / s)
w: Vertical (z) component of wind speed (m / s)
p: Barometric pressure (Pa)
ρ: Air density (・ / m ³ )
KX, KZ: Vortex diffusion coefficient (m ² / s)
KX = KZ = ku * z
k: Kalman constant (≈0.4)
u *: Friction speed (m)

u（z）：高さzにおける風速（ｍ/ｓ）
z0：粗度長（ｍ）
雪面では１０^−３〜１０^−２ｍとされる。 Boundary condition It is assumed that the following exponential distribution law 4 holds on the windward side.
[Exponential distribution side]

u (z): Wind speed at height z (m / s)
z0: Roughness length (m)
On the snow surface, it is 10 ⁻³ to 10 ⁻² m.

B) Snow-flying simulation model Equations 5, 6, and 7 below are used to determine the snow-flying motion under a given airflow.
[Equation of motion]

Ｑ：雪の鉛直流量（g/ｍ^２ｓ）
ｎ：飛雪密度（g/ｍ^３）
ｗｐ：落下速度（ｍ/ｓ）
ｇ：重力加速度（＝９．８ｍ/ｓ^２）
κ：空気抵抗係数（１/ｓ） [Advection diffusion equation]

Q: Snow vertical flow rate (g / m ² s)
n: Snow density (g / m ³ )
wp: Falling speed (m / s)
g: Gravitational acceleration (= 9.8 m / s ² )
κ: Air resistance coefficient (1 / s)

ｎ０：高さｚＲにおける飛雪密度
ｋ：カルマン定数（≒０．４） Boundary condition Equation 8 below gives the snow density on the windward side as follows [Snow density]

n0: Snow density at height zR k: Kalman constant (≈0.4)

2) Simulation design The initial input data was prepared as follows.
a Road structure
Flat structure
Roadside: 3.2m, sidewalk: 1.5m, roadway: 3.25m (to the center of the road)
b Topographic conditions
Roughness length: Snow surface (0.01m)
c Weather conditions
Wind direction wind speed: 10.0 m / s, snow density: 2.5 g / m ³
d Countermeasure work type
Snow fence high performance type e Fence structure
Fence height: 4.0m, lower part: 0.78m, 4 snow plates (with reverse rectifying plate)
f Fence installation position
Distance from road: 3.2m

3) Simulation calculation / output Using the snow fence as a blow fence, a simulation was performed based on each set value in Table 1.
The air resistance coefficient κ was 30 (1 / s) (final falling speed g / κ≈0.3 m / s, standard snow value). The visibility is based on the following approximate expression 9 obtained from the observation results of the Hokkaido Civil Engineering Laboratory.
[Visibility approximation formula]

    As a result of the simulation calculation as described above, the result of the snowproof action as shown in the analysis diagram of the snow situation in FIG. 10 was obtained. By the arrows indicating the wind direction and wind speed in FIG. 10, the snowstorm blown from the windward side reaches the snow fence 1 and rises, and no vortex or entrainment flow is generated on the leeward side near the upper end of the induction swash plate 2. It is released toward the leeward upper side of the snow fence 1 and rises with the air on the road W, which is the leeward side of the snow fence 1, so that the snow on the road W and the generation of snow smoke associated therewith can be ensured. I was able to confirm how to prevent it.

    More specifically, the result of the simulation is shown in FIG. 11 which is a front view of a two-lane road where a snow fence is installed and a perspective view of wind and snow which is blown on the snow fence shown in FIG. The wind and snow B, B,... Are guided upward along the inclined surfaces of the wind-proof snow plates 4, 4,. The wind and snow B sprayed on the reverse rectifying plate 3 reverses upward along the arcuate wall surface and rises along the windproof snow plates 4, 4,..., B, B,. ... that rises while entraining, and wind and snow blown from the windward side toward the windward wall surface of the induction swash plate 2, along with the wind pressure and wind speed while increasing the wind pressure and wind speed, the windward upper side of the induction swash plate 2 To the top of the snowmelt swash plate 2 Without generating a tree-inclusive wind or the like, and then all at once drifting snow to leeward outside of the road W.

    Further, as indicated by a two-dot chain line arrow in FIG. 12, the wind and snow BG sprayed from the direction inclined with respect to the snow fence 1 also rises along the wind shield snow plate 4, and the cut cylindrical wall surface of the reverse rectifying plate 3 , The wind is swung up by wind and snow B, B,... Which is reversed and raised by the reversal rectifying plate 3, and then rises along the induction swash plate 2 and jumps to the leeward outside of the road W. It will be snowed.

    More specifically, referring to FIG. 2 and FIG. 3, the wind and snow B sprayed on the windbreak snowboard 4 temporarily fixed in a posture inclined to the leeward side by an angle β of about 88 ° with respect to the horizontal surface The wind and snow B sprayed on the reversal rectifying plate 3 enters the valley-shaped openings of the upper and lower two vertical plates “B” -shaped bent plates 31, 31. The turbulence component is rapidly attenuated and guided to the upper rectifying surface 33 in the lower-side bent plate 31 fixed in a posture in which the rising inclination angle Φ1 with respect to the horizontal line HL is 64.5 °, and is directed obliquely upward on the windward side. The upper rectifying surface 33 of the bent plate 31 arranged on the upper side realizes the same guidance.

    The wind and snow B guided to the up-and-down bending plate 31 of the reversal rectifying plate 3 in this way exerts an action of pushing up the wind and snow B that is guided by the wind-proof and snow plate 4 and rises obliquely upward toward the windward side, Ascending with the wind and snow B to be blown onto the induction swash plate 2, the wind and snow B that reaches the induction swash plate 2 by being depressurized by the action of the wind and snow B is caused by the bending plates 21, 21,. It enters into the valley-shaped opening formed between them, and is guided to the lower rectifying surfaces 24, 24,... Having the rising inclination angle Φ2 with respect to the horizontal line HL of each bent plate 21, 21,. Thus, although it is gentle compared with the inversion rectifying plate 3, it acts so as to discharge upward toward the windward side slightly, and the vortex, turbulent flow, or entrainment flow near the upper end of the induction swash plate 2 To prevent the occurrence of The snow will fly away.

    Further, when the bent plate 31 shown in FIG. 4 is used to form the reverse rectifying plate 3, the turbulent flow component of the incoming snowstorm is rapidly attenuated by its generally “<”-shaped vertical cross section, and the upper side As shown in FIG. 3, the rectifying surface 33 can invert and guide the wind and snow B in the angle direction of Φ1 toward the windward side, and the bent plate 21 having the same size and shape with respect to the induction swash plate 2. Then, by mounting the bottom portion 22 in a posture that projects to the windward side, the lower rectifying surface 24 inverts the wind and snow B in the angle direction of Φ2 toward the windward side, as shown in FIG. Induce.

    Further, when the keystone plate of the windbreak snowboard 4 is replaced with the bent plate 41 as shown in FIG. 5 and the bottom portion 42 is mounted so as to face the windward side, the rising inclination angle Φ3 toward the windward with respect to the horizontal line HL is set. , The lower rectifying surface 44 incorporated in the posture of 54.6 ° greatly attenuates the turbulent flow component in the wind and snow B sprayed from the windward, reverses upward obliquely upward, and inverts positioned above It sends out toward the baffle plate 3.

    The snow fence 1 shown in FIG. 6 of Example 2 cuts the upper end side of the windproof snow plate 4 and extends the lower end side of the reverse current plate 3 so that the wind direction reversal function of the reverse current plate 3 is achieved. It is possible to expand the range that can be exhibited. Further, as in the snow fence 1 of FIG. 7, the reversal rectifying plate 3 is substantially extended from the vicinity of the ground to the vicinity of the lower end of the induction swash plate 2, so that the wind and snow sprayed from the vicinity of the ground can be quickly directed upward. It can be reversed and raised.

    The snow fence 1 shown in FIG. 8 is obtained by substantially extending and arranging the reverse rectifying plate 3 up to a range corresponding to the induction swash plate 2, but a plurality of bent plates incorporated in the reverse rectifying plate 3. 31, 31,... Reverses and raises the wind and snow blown from the windward side by the lower rectifying surfaces 34, 34,... It is possible to prevent the occurrence of turbulent flow, vortex, entrained airflow, etc., and further, the lower end side of the windbreak snowboard 4 is moved to the windward side as in the snow fence 1 shown in FIG. By making the inclination angle to the windward side relatively large, it is possible to promptly guide and raise the wind and snow blown from the windward side.

(Effect of Example)
The snow fence 1 according to the first embodiment having the above-described configuration is provided with the support columns 5, 5,... As shown in FIGS. Folding is possible from a predetermined position on the ground, and each windproof snowboard 4, 4, ..., reverse rectifying board 3, 3, ..., and induction swashplate 2, 2, ... are removed and stored in a stack. It is possible to enhance the landscape by ensuring visibility from the road W from spring to autumn, and in the winter period, each column 5, 5, ... is set up and fixed, and each windshield 4 , 4,..., The reverse rectifying plates 3, 3,... And the induction swash plates 2, 2,. The characteristic that it can do is obtained.

    Further, as shown in FIGS. 1 to 3, the upper and lower ends of the reverse rectifying plate 3 are arranged in the vicinity of the leeward side corners of the upper end of the windbreak snowboard 4 and the lower end of the induction swash plate 2, and the reverse rectifying plate 3 is It is possible to improve the function of reversing the blowing snow to be blown, and the bent plates 31, 31,... As shown in FIG. 4, the opening angle γ1 of the upper and lower rectifying surfaces 33 and 34 with respect to the bottom 32 is changed to 142.1 ° from 135.6 ° in the case of the ready-made normal product, and the upper and lower rectifying surfaces 33 and 34 are changed. The angle γ2 formed by the upper and lower connecting ends 35 is changed from 135.6 ° to 147 ° in the normal product, and the windward side when combining a plurality of sheets vertically and circularly in a longitudinal section To ensure smooth continuity of the wall Can, to prevent the occurrence of air resistance and wind noise due to unnecessary seams irregularities or strong stepped portion or the like, an effect of improving the quietness by suppressing generation of vibration throughout the snow fences 1.

    As shown in FIGS. 1 to 3, the windbreak snowboard 4 is made of a keystone plate that is supplied in a relatively large amount to the market, and the existing product is separately post-processed or completely dedicated. Compared to a combination of manufactured bent plates, the price can be significantly reduced and it is possible to provide the market with a sufficient rectifying function, or the windbreak snowboard 4 is shown in FIG. Are formed by a combination of a plurality of bent plates 41, 41,..., And the bottom portions 42, 42,... Of the bent plates 41, 41,. The lower rectifying surfaces 44, 44,..., Which are arranged in a direction to be damped, can attenuate the turbulent flow component of the blowing wind and snow, and have an angle Φ3 with respect to the horizontal plane of 54.6 ° while ensuring sufficient pressure resistance. ... However, it is possible to invert and raise the wind and snow blown from the windward diagonally upward, and to disperse and reduce the wind pressure concentrated on the reversal rectifying plate 3, thereby greatly improving the durability of the snow fence 1 itself. Can be increased.

    The snow fence 1 shown in FIG. 6 of the second embodiment expands the vertical installation range of the reversal rectifying plate 3 and can suppress a sudden change in the air flow, and can reverse and raise more wind and snow at once. Thus, it is possible to further enhance the function of preventing the occurrence of eddy currents and winds on the upper lee side of the induction swash plate 2, and the snow fence 1 shown in FIG. 7 further blows snow near the ground. Can also be effectively reversed and raised, and, like the snow fence 1 shown in FIG. As shown in FIG. 9, the lower end side of the windproof snow plate 4 is inclined to the windward side, so that the wind and snow sprayed on almost the entire surface is efficient. Can be reversed and raised, and the equipment costs There is an advantage that both reduction and improvement of the snow protection function can be achieved.

(Conclusion)
As described above, the snow fence according to the present invention can achieve the intended purpose uniformly by its new configuration, and is easy to manufacture, and is set to the same overall height as that of the conventional snow fence. In addition, the range of snow-proof space that can be formed on the leeward side can be greatly expanded, and the assembly posture of each induction swash plate, reverse rectifying plate and wind-proof snow plate is specified in advance, during assembly and during use, Economical because it is possible to obtain a sufficiently high snow protection effect without changing the mounting angle according to changes in weather conditions, etc., and it is easy to assemble and install and maintenance work after installation, and can suppress rising management costs Because of its excellent snow protection effect, it is greatly welcomed by public organizations and local governments that manage facilities important to urban functions such as road traffic networks. The Widely utilized is highly regarded by passer and a driver or the like various fields utilizing the location road, it is expected to be that continue to spread.

The drawings show some typical embodiments embodying the technical idea of the snow fence according to the present invention.
It is a side view which shows the structure of a snow fence. It is a side view which shows each part dimension of a snow fence. It is a side view which shows the snow fence which expanded the principal part. It is a longitudinal cross-sectional view which shows the shape of a bending plate. It is a side view which shows the snow fence fence waist which changed the windproof snow board. It is a side view which shows the snow fence which expanded the up-down dimension of the inversion rectifying plate. It is a side view which shows the snow fence which extended the lower end of the reverse rectifying plate to near the ground surface. It is a side view which shows the snow fence which extended the reverse rectification | straightening board to the uppermost vicinity of the snow fence. It is a side view which shows the snow fence which inclined the lower end of the windproof snow board to the windward side. It is an analysis figure which shows the snow-flight situation obtained by simulation of the snow fence. It is a front view which shows the 2 lane road which installed the snow fence. It is a perspective view which shows the wind and snow sprayed on a snow fence with an arrow. It is a front view which shows the road which installed the conventional snow guard.

Explanation of symbols

1 Snow fence 2 Guide swash plate
21 Bending plate
22 Same bottom
23 Same upper rectifying surface
24 Same bottom rectifying surface
25 Same connection edge 3 Reverse rectifier
31 Same bent plate
32 Same bottom
33 Same upper rectifying surface
34 Same lower rectifying surface
35 Same connection edge 4 Windproof snowboard (Keystone plate)
41 Same bent plate
42 Same bottom
43 Same upper rectifying surface
44 Same bottom rectifying surface
45 Same connection edge 5 Post
51 Same base plate
52 Folding mechanism
53 Upright pillar
54 Same arcuate pillar
55 Same connecting reinforcing plate F Conventional snow fence F Road B Wind direction BG Wind and snow blown diagonally IL Virtual straight line H Windproof snowboard ground height β Angle of inclination of windproof snowboard to the leeward side h Vertical dimension of reverse rectifying plate HL Horizontal line VL Vertical line V Vertical dimension of bent plate D Depth dimension of bent plate L Length of rectifying surface of bent plate γ1 Opening angle between bent plate upside bottom and rectifying surface γ2 Between bent plate leeward side rectifying surface and connecting edge Opening angle S Length of connecting edge d Inclined dimension of connecting edge Φ1 Angle of rectifying plate bent plate upper rectified surface with respect to horizontal line Φ2 Angle of guiding swash plate bent plate lower rectified surface with respect to horizontal plane Φ3 Windproof snow plate bent plate lower rectified The angle of the face to the horizontal plane

Claims (10)

    Each strut erected at a predetermined interval is used as a support, and a windbreak snowboard and a guide swash plate located on the upper end of the strut are placed between each strut, and between the struts in the range from the ground to the upper end. Is divided into a leeward side and a leeward side, and is bent or bent to the leeward side at a predetermined upper and lower width portion that is higher than the intermediate position in the vertical direction and lower than the guide swash plate. The inverted rectifying plate is formed in a concave shape so that its upper end edge is regulated so as to be shifted slightly leeward than the lower end edge, while on the upper side from directly above the upper end edge of the inverted rectifying plate. The snow proof fence is characterized in that the guide swash plate is installed on the leeward side in an appropriately inclined manner.     Each strut erected at a predetermined interval is used as a support, and a windbreak snowboard and a guide swash plate located on the upper end of the strut are placed between each strut, and between the struts in the range from the ground to the upper end. Is divided into a leeward side and a leeward side, and is bent or bent to the leeward side at a predetermined upper and lower width portion that is higher than the intermediate position in the vertical direction and lower than the guide swash plate. The inversion rectifying plate having a concave shape is laid sideways in a posture in which the upper end edge thereof is regulated so as to be shifted slightly leeward from the lower end edge, while the upper side of the inversion rectifying plate is upward from just above the upper end edge of the inversion rectification plate. The guide swash plate shall be installed on the leeward side in an appropriate angle-inclined posture, and wind and snow that has risen along the windbreak snowboard below it will be caught in the wind and snow that blows directly on the reverse rectifying plate. Inverted and raised along the concave surface Allowed to rectify as toward the higher-level side of the induction swash plate, a windproof snow range downwind from post upright position, snow fences, characterized in that as a possible expansion more downwind side.     Each strut erected at a predetermined interval is used as a support, and a windbreak snowboard and a guide swash plate located on the upper end of the strut are placed between each strut, and between the struts in the range from the ground to the upper end. Is divided into a leeward side and a leeward side, and is bent or bent to the leeward side at a predetermined upper and lower width portion that is higher than the intermediate position in the vertical direction and lower than the guide swash plate. While the reverse rectifying plate having a concave substantially roll-over 1/2 to 1/10 cut cylindrical shape is set in a posture in which its upper end edge is regulated so as to be slightly leeward than the lower end edge, A snow fence, characterized in that the guide swash plate is installed in an angle inclined posture on the leeward side as appropriate from above the upper edge of the reverse rectifying plate.     Each strut erected at a predetermined interval is used as a support, and a windbreak snowboard and a guide swash plate located on the upper end of the strut are placed between each strut, and between the struts in the range from the ground to the upper end. Is divided into a leeward side and a leeward side, and is bent or bent to the leeward side at a predetermined upper and lower width portion that is higher than the intermediate position in the vertical direction and lower than the guide swash plate. Reversing rectifying plate having a concave roll-over 1/2 to 1/10 cut cylindrical shape, the upper end edge of which is regulated to an angular attitude of 89 ° to 80 ° slightly inclined to the leeward side of the lower edge, On the other hand, there is provided a snow fence characterized in that the guide swash plate is provided in an angle-inclined posture on the leeward side from above and directly above the upper edge of the reverse rectifying plate.     Each strut erected at a predetermined interval is used as a support, and a windbreak snowboard and a guide swash plate located on the upper end of the strut are placed between each strut, and between the struts in the range from the ground to the upper end. Is divided into a leeward side and a leeward side, and is bent or bent to the leeward side at a predetermined upper and lower width portion that is higher than the intermediate position in the vertical direction and lower than the guide swash plate. Reversing rectifying plate having a concave roll-over 1/2 to 1/10 cut cylindrical shape, the upper end edge of which is regulated to an angular attitude of 89 ° to 80 ° slightly inclined to the leeward side of the lower edge, On the other hand, the induction swash plate is horizontally installed in an angle inclined position of 45 ° to 80 ° on the leeward side in the range of 400 to 1500 from the vicinity immediately above the upper edge of the reverse rectifying plate. A snow fence characterized by     The induction swash plate is composed of a plurality of bent plates having a generally “<”-shaped cross section combined with a longitudinal cross-sectional waveform, and the rising inclination angle with respect to the horizontal of the lower rectifying surface toward the windward of each bent plate is 75 °. The snow fence according to any one of claims 1 to 5, wherein the snow fence is incorporated into an attitude of 85 to 85 degrees.     The inverted rectifying plate is composed of a plurality of bent plates having a generally “<”-shaped cross section combined with a longitudinal cross-sectional waveform, and the rising inclination angle with respect to the horizontal of the upper rectifying surface toward the windward of each bent plate is 30 ° to The snow fence according to any one of claims 1 to 6, wherein the snow fence is incorporated in an attitude of 70 °.     A windbreak snowboard arranged below the induction swash plate and the reverse rectifying plate is composed of a plurality of bent plates having a generally “<”-shaped cross section combined with a vertical cross-sectional corrugation. The snow fence according to any one of claims 1 to 7, wherein a rising inclination angle with respect to a horizontal direction of the upper rectifying surface that is directed is incorporated in a posture of 50 ° to 60 °.     The snow fence according to any one of claims 3 to 7, wherein the wind-proof snow plate disposed below the induction swash plate and the reverse rectifying plate is made of a keystone plate having a corrugated longitudinal section. The windbreak snowboard arranged below the induction swash plate and the reverse rectifying plate is fixed in a posture inclined at 89 ° to 80 ° with respect to the horizontal, with its upper end facing leeward. The snow fence according to any one of claims 1 to 9.

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