JP4134053B2 - Snow fence for slant wind - Google Patents

Description

  The present invention relates to a snow fence, and more particularly, to a snow wind fence compatible with oblique wind.

  As measures to prevent snow on roads, etc., blow-off type snow fences with multiple-level snow-prevention boards suspended between struts standing at intervals, and multiple-stage snow-prevention boards between the columns Blow-off type snow fences that are installed in such a manner that each snow protection board is inclined at an appropriate interval in winter, and the snow blowing and strong wind are guided and distributed diagonally downward in the gaps of each snow protection board are known. .

These snow fences have a certain effect when the main wind direction at the time of snowstorm is almost 45 degrees or more from the right angle to the fence, but the main wind direction is 45 degrees from the parallel to the road as shown in FIG. When the inflow wind direction angle is small, such as below, the effective range as a snow fence becomes narrow, and there is a problem that visibility disturbance occurs in the roadway portion other than the vicinity of the snow fence.
Conventionally, as a countermeasure, only the height of the fence block is raised, and even if such measures are taken, it is effective for the slant wind direction with a small inflow wind direction angle such that the main wind direction is about 45 degrees or less from parallel to the road. It was scarce.
Japanese Patent Laid-Open No. 10-18233

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to ensure visibility against a snowstorm with a slant wind direction with a small inflow wind direction angle with respect to the road, and a short section. It is an object of the present invention to provide a novel snow-break fence that can carry a snowstorm outside the road and can also handle a snowstorm that blows down from the sky by forming a barrier on the road.

In order to achieve the above-mentioned object, the present invention provides a plurality of snow protection plates in a multi-stage and foldable between the support columns on both sides, and changes the wind direction and blows up and blows on the top snow protection plate. Several stages of raising plates are arranged, and the torsional wind blowing plate is twisted on the upper surface so that one end in the width direction is higher than the other end and one end in the width direction is lower than the other end. It is characterized by being.

According to the present invention, even when snow blows from an oblique direction of about 45 degrees or less from parallel, the snowstorm can be carried out of the roadway in a short section to ensure visibility, and the accumulation of wind can be improved, and the inflow wind direction angle is 45 degrees. Therefore, it can be applied to snowstorms at right angles, so it can be applied to places with significant wind direction changes.
In addition, it is possible to form a barrier that crosses the road by blowing up the wind at the time of snowstorm while changing the direction of the wind, so it can cope with snowstorms blowing down from the sky and without hitting pedestrians and vehicles directly It is safe.
Furthermore, since it has both wind direction conversion and blowing performance, it can also be applied to wide roads, hardly causing snow accumulation on the road, and the wind direction blowing plate has a width on the upper surface of the wind direction blowing plate. Since the twist is applied so that one end in the direction is higher than the other end and one end in the width direction is lower than the other end, the wind direction can be effectively changed and blown up with a simple configuration It can have the performance of flying.

Preferably, the upper surface of the wind blowing plate has a straight slope in the width direction or a concave curved surface in the width direction. In particular, since the latter has a concave cross section, the wind induction effect is better due to the bank action and the passage action, and the wind direction conversion characteristics and the blowing characteristics can be improved. The twist of the airflow direction blowing plate includes both a case where it is symmetric with respect to the diagonal line and a case where it is asymmetrical with respect to the diagonal line.

Preferably, there are two or more wind direction blowing plates, and each wind direction blowing plate has a projecting shaft guided by a longitudinal groove of a column on each end slope in the longitudinal direction. The raising plate is connected to the projecting shaft of the uppermost snow protection plate by an angle-regulated link, and the upper wind-direction blowing plate is connected by an angle-regulated link connected to the projecting shaft of the lower wind-direction blowing plate. The upper wind direction blowing plate is connected with a suspension rope, and by pulling it, the upper and lower wind direction blowing plates are inclined upward at a predetermined angle to the road side, and change between the upper and lower wind direction blowing plates. A wind direction flow path is formed.
According to this, when not in use, it can be folded compactly by refraction of the link, and when used, the wind direction conversion characteristics and the blowing characteristics can be exhibited by the upper and lower wind direction blowing plates.

Preferably, the plurality of snow-preventing plates are made of a perforated plate having a large number of small holes arranged through the plate surface.
According to this, since a large number of small holes are arranged on the plate surface, good transparency can be obtained by the small hole group, not only reducing the feeling of pressure and closing, but also providing light running performance, Ventilation can prevent a sudden drop in wind speed to prevent visibility, and turbulence can be prevented to improve the function of the upper airflow direction blowing plate. Therefore, the airless plate stops the snowfall, the perforated plate prevents the wind speed and the turbulent flow, the visibility is ensured, and the effect of blowing the snowstorm out of the roadway by the upper wind blowing plate is obtained.
It is preferable to have a perforated trapezoidal unevenness in the cross section. According to this, since the strength is increased and a large number of small holes are arranged on the surface forming the unevenness, that is, the up and down inclined surface and the top surface of the trapezoidal cross section, the wind from the outside of the road is horizontally, upward and It can be distributed downward and flow to the road side, and the snow on the road can be reliably blown away without tilting the snow barrier.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 3 show an embodiment of a blow-up type snow fence according to the present invention. Reference numerals 1 and 1 denote H-shaped steel and square steel pipes, etc., which are erected on a concrete foundation with anchors or the like at predetermined intervals. The guide has vertical grooves 10 and 10 on the side surface. A headboard 11 is installed on the upper part between the columns.
Reference numeral 2 denotes a plurality of (six in the drawing) snowproof plates disposed between the support columns 1 and 1, and includes a perforated plate 2A provided with a large number of holes and a non-perforated plate 2B provided with no holes. Yes. In this example, a plurality of upper plates (4 in the drawing) are perforated plates, and several lower plates (2 in the drawing) are non-porous plates.

Reference numerals 3 and 3 ′ denote a plurality of (two in the drawing) variable wind direction blowing plates arranged on the snow-preventing plate 2 in order to drain snow from the sky to the outside of the road. The airflow direction blowing plates 3 and 3 'and the perforated plate 2A and the non-perforated plate 2B are connected to each other in a foldable or refractable manner by a link mechanism, and have projecting shafts 300 and 200 at both longitudinal ends, respectively. 300 and 200 are fitted in the vertical grooves 10 and 10 of the support columns 1 and 1 so as to be slidable in the vertical direction.

  Each strut 1 has ladders 4 and 4 fixed on the road side, abutments are projected on the side road side, and a rope 6 is extended from a winch 5 mounted on the abutment. The end of the rope via the pulley 7 attached to the top is connected to the uppermost wind blowing plate 3 or the lower snow plate 2, and when the rope 6 is pulled up, the wind blowing plate 3 and the snow plate 2 are suspended. In use, as shown in FIG. 1 and FIG. 2, each wind direction blowing plate 3, 3 ′ is on the road side within a required inclination angle of, for example, 30 to 60 degrees, in this example 45 degrees. In this way, a guide passage Z for changing wind direction and blowing is formed between the upper and lower parallel blowing direction blowing plates 3 and 3 ′. 2 is suspended in a straight line in the height direction and functions as a blow-off fence It has become the jar. The said inclination | tilt angle is an angle which the bottom face and horizontal of a baffle direction blowing plate make.

The parts of the first embodiment will be described in detail. As shown in FIG. 4 and FIG. 6, the airflow direction blowing plates 3 and 3 ′ are right-angled triangles at both ends in the longitudinal direction or an end plate 30 having a similar shape. 30 and a face plate (upper surface plate) 31 made of a smooth and corrosion-resistant material such as a galvanized steel plate, stainless steel, and engineering resin in a strip shape and stretched between the end plates 30 and 30.
The end plates 30, 30 are arranged in opposite directions, and side plates 33, 33 whose angle gradually changes from one end in the longitudinal direction to the other end are arranged on the end surface in the width direction. , 30 and the side plates 33, 33 are twisted to fit the inclined surfaces, and in this example, the twist is symmetrical with respect to the diagonal line of the plate, that is, has a similar shape at both ends in the plate longitudinal direction. This means that the cross-sectional shapes at points equidistant from the center in the longitudinal direction of the plate are similar.
Specifically, in FIG. 4, the rear end (back) in the width direction is high at the left end, and is inclined downward toward the other end (front) in the width direction, and is continuous in the longitudinal direction so that the back side is low and the front side is high. In contrast, at the right end, the rear end (back) in the width direction is low and is inclined upward toward the other end (front) in the width direction. 31A is a left part in the drawing with a diagonal line as a boundary, and 31B is a right part. In this example, a flat bottom plate 32 is stretched on the lower surface to form a hollow cross-sectional structure as a whole.
The torsion angle acts as the wind direction turning angle. Although the angle is arbitrary, it may be selected from a range of about 10 to 60 degrees on average.

A protruding shaft 300 is provided at the center in the width direction of each of the end plates 30, 30, and a protrusion 301 is provided at one end in the width direction. The different wind direction blowing plates 3, 3 'can be interlocked.
Further, an inclined stopper 302 is fixed on the opposite side to the protrusion in the width direction. When the link abuts against this stopper, the upper and lower airflow direction blowing plates 3 and 3 'become vertical as shown in FIG. Instead, it is held at a predetermined angle.

  As shown in FIG. 3, the base end of the link 9 is pivotally attached to the projecting shaft 300 on the end plate 30 of the lower wind direction blowing plate 3 '. The link 9A has a length for adjusting the distance between fulcrums. A hole 90 is provided, and this is fitted into a protrusion 303 provided in a portion near the stopper 302 of the end plate 30 in the upper airflow direction blowing plate 3, so that it can be used as shown in FIGS. 3 and 10B. And the state change at the time of storage can be obtained.

The perforated plate 2A and the non-perforated plate 2B as the snowproof plate 2 are not flat plates, but have a plurality of trapezoidal uneven portions 21 in the cross section as shown in FIGS. 7 and 8, and these uneven portions are in the longitudinal direction. It is continuous. End plates 20 and 20 are fixed to both ends in the longitudinal direction, and a reinforcing plate 22 is fixed to the middle.
In the perforated plate 2A, as shown in a partially enlarged view in FIG. 9, a large number of small holes 210 are closely arranged on the entire concave and convex portion 21 including the top, bottom, and inclined surface. The hole 210 is inclined according to the angle of the slope.

In the middle of each end plate 20 in the width direction, a projecting shaft 200 that fits in the vertical groove 10 of the support column is provided, and a link 9B is pivotally attached to the projecting shaft 200 with a ring portion at the base end.
The link 9B from the perforated plate 2A as the uppermost snow-preventing plate 2 extends obliquely upward and fits into a protrusion 303 provided at a portion near the stopper 302 of the end plate 30 of the lower wind-direction blowing plate 3 '. It is connected with.

  Similarly, the perforated plate 2A and the non-perforated plate 2B below the same are also provided with a link 9B pivotally attached to the projecting shaft with a base end ring portion, and a protrusion 202 provided at the end in the width direction of the end plate 20. Are connected by fitting the tip of the link 9B from the lower side.

  The usage and action of the first embodiment will be described. In installation, the wind direction blowing plates 3, 3 'are connected to each other by a link 9A, and the lower wind direction blowing plate 3' and the uppermost snow protection plate 2 are connected. The perforated plate 2A is connected by a link 9B, and the lower perforated plates 2A, the lowest perforated plate 2A and the non-perforated plate 2B are connected by a link. Thereby, as shown in FIG. 10 and FIG. 11, the snow protection plate 2 is folded in a multi-stage shape, and the airflow direction blowing plates 3 and 3 ′ overlap each other. One end of the connecting plate 8 is connected to one of the wind blowing plates 3, 3 ', and the other end is left free. The variable wind direction blowing plates 3 and 3 ′ depend on the wind direction, but when viewed from the side road side, as shown in FIG. 1 and FIG. 4, the high surface is in the back (road side) in the left end area on the inflow side. Yes, in the right end area on the outflow side, arrange so that the high surface is in front (side road side).

  Next, the assembly is arranged between the columns 1 and 1, and the projecting shafts 300, 300, 200, 200 at both ends are fitted into the longitudinal grooves 10 and 10 of the columns 1, 1, and the projection of the uppermost wind direction blowing plate 3 is projected. The ends of the ropes 6 and 6 descending from the pulley are connected to the shaft portion. Now that the set is complete, if the winches 5 and 5 are actuated to pull the ropes 6 and 6, the wind direction blowing plates 3 and 3 'and the snow plate 2 below them are connected via the links 9A and 9B. Since it is connected, it rises as a series, and the snow protection plate 2 tilts from the horizontal state to become vertical, and the upper and lower sides interfere with each other and are fixed.

  When the airflow direction blowing plate 3 is lifted, the tip side portion of the link 9A comes into contact with the stopper 302, so that it does not become vertical but is inclined at a predetermined angle. The lower airflow direction blowing plate 3 ′ is not vertical because the link 9 </ b> B extending from the uppermost perforated plate 2 </ b> A contacts the stopper 302, and is inclined at a predetermined angle. Therefore, the other end of the connecting plate 8 is connected to the other wind blowing plate 3 (or 3 ') to fix the angle. Then, the stop shaft 12 is inserted into the column flange portion at a position corresponding to the lower portion of the projecting shaft 300 of the uppermost airflow direction blowing plate 3 so as not to fall inadvertently so as to be orthogonal to the axis of the projecting shaft. . Thus, the state shown in FIGS. 1 to 3 and FIG. 12 is obtained. In addition, you may set so that the baffle direction blowing plates 3 and 3 'may not become the whole, but may become high toward a leeward side. This is more effective by blowing up.

  Instead of this, a suspension type may be used. That is, in the state shown in FIGS. 10 and 11, that is, in a state where the lower part is folded up in a multi-stage, the whole is horizontally lifted up to the upper end position of the column, and the rope end is connected to the lowermost snow protection plate 2. The stop shaft 12 is inserted through a column flange portion at a position corresponding to the bottom of the projecting shaft 300 of the airflow direction blowing plate 3 so as to be orthogonal to the axis of the projecting shaft. Since it will be in a lifting state by this, the winches 5 and 5 will be operated and a rope will be let out. Thereby, the snow-prevention board 2 descends vertically from the lower one in order, and finally becomes the state shown in FIG. 1 to FIG. 3 and FIG.

In this state, since the required number of steps below the snow barrier plate 2 is the non-porous plate 2B, snowfall to the leeward side (road side) of the fence is prevented, and this can particularly alleviate visibility problems on the lower side of the fence. . In addition, it is possible to prevent the accumulation of “low ground snowstorm” that flies low on the snow surface from flowing into the road and generating inside the fence (on the road side) and retaining the accumulation on the outside of the fence.
Since the required number of steps of the snow protection plate 2 (four steps in the drawing) is the perforated plate 2A, the scenery outside the road is seen through the small hole group 210, and the scenery is improved. When a snowstorm occurs, the wind from the side road passes through the small hole group 210 of each perforated plate 2A and flows to the road side. However, the perforated plate 2A has a trapezoidal cross section, and the uneven surface Since the small holes are respectively disposed in the wind, the wind is distributed in the horizontal direction, the diagonally upward direction, and the diagonally downward direction, flows to the road side, and discharges the snow accumulated on the road surface. Moreover, since the perforated plate 2A has a trapezoidal cross-sectional irregularity, the strength is increased and it can withstand strong winds. In addition, if snow from the windward is prevented with airless holes, a rapid wind speed drop occurs on the leeward side of the fence, and visibility is disturbed due to turbulence, but a sudden drop in wind speed can be prevented by ventilation and visibility is prevented. it can. Further, by preventing the generation of turbulent airflow, the effect of the airflow direction blowing plates 3 and 3 ′ can be further ensured.

Furthermore, in the present invention, there are at least two wind-direction blowing plates 3, 3 ′ above the snow protection plate 2, which are inclined upward toward the road, and the wind-direction blowing plates 3, 3 ′. Are not simply inclined in the plate width direction, but are surfaces 31A and 31B which are symmetrically twisted with a diagonal line as a boundary like a propeller blade. At the end of the surface 31A, the depth is high and this is the inflow portion, and at the end of the surface 31B, the front is high and is low toward the road side.
For this reason, the wind that flows toward the snow fence is applied to the wind blowing plates 3 and 3 ', so that the wind direction is changed as shown by the solid lines in FIGS. 14 and 15 (b) by the torsion guide action. As shown in Fig. 13 and Fig. 15 (a), the snowstorm is blown over the road side, and the snowstorm is carried away from the road in a short section in the opposite direction of the fence (shoulder on the opposite road) while drawing a parabola. It is. Moreover, since the wind on the road becomes a barrier, as shown by the dotted line in FIG. 15 (b), the snowstorm that blows down from the sky is carried away, making it difficult to pour onto the road.
Therefore, as shown in FIG. 26 (b), the visibility is ensured better against the slant wind as compared with the conventional fence of FIG. 26 (a), and an extremely wide range of effects can be obtained.
In addition, even when a snowstorm in the reverse direction occurs from the road side, the airflow is divided into a snowstorm that exceeds the upper part of the upper wind-up plate 3 and a snowstorm that flows parallel to the road surface. Since the amount is divided into those carried to the top of the snow fence and those carried in the direction of the fence, visibility near the inside of the snow fence is improved.

The result of having produced the snow fence of 1st Example, installing in the field, and performing the field experiment is shown. The airflow direction blowing plate has a length of 3800 mm and a width of 500 mm, and the face plate is twisted symmetrically with respect to the diagonal so that the angle is approximately 30 degrees with respect to the horizontal (the torsion angles of the inflow part and the discharge part are the same). Tensioned.
Such a wind blowing plate is set on the 6-level snow protection plate so that the bottom plate is at an angle of 45 degrees with respect to the horizontal, and the snow-prevention fence of the present invention has a spacing of 4 m between columns and a height of 4 m. This was installed in an experimental field with a width of 20 m and an extension direction of 50 m for 32 m in the extension direction, and the effect of providing a blow-up plate for changing wind direction was measured. FIG. 16 (a) shows an outline of the twist angle. The upwind (inflow side) angle is plus 15 degrees (and therefore 60 degrees) and the downwind (outflow side) angle is minus with respect to the basic average angle of 45 degrees. 15 degrees (and hence 30 degrees).
1) Wind direction conversion performance: According to the wind speed and wind direction measurement, the wind direction conversion angle for the fence (in the vicinity of the roadside from the snow fence position) in the slant wind whose inflow wind direction angle θ is parallel to 45 degrees or less shown in Fig. 16 (b) The angle when connecting up to a straight line) was 30 to 45 degrees.
2) Blow-up performance: As a result of the smoke method, it was blown up at about 32 degrees at the blow-out exit and carried outside the width of the road.

When the winter season has passed, the connecting plate 8 is removed and the rope is extended to lower the whole, and the link can be made into a compact folded state as shown in FIGS.
In addition, this invention is good also as three or more sheets of a baffle direction blowing plate in order to further strengthen a blowing effect.

17 to 25 show a second embodiment of the present invention.
Since the basic configuration of this embodiment is the same as that of the first embodiment, the same reference numerals are given to the same portions, and the description is incorporated.
The feature of this embodiment is the structure of the wind blowing plates 3 and 3 ', and in particular, the face plate 31 is not linearly inclined but curved in a concave shape.
In other words, the draft direction blowing plates 3 and 3 'are shown in FIG. 20 and FIG. 22, and end plates 30 and 30 having a right triangle or similar shape at both ends in the longitudinal direction, a galvanized steel plate, stainless steel, and the like. And a face plate (upper surface plate) 31 that is made of a smooth and corrosion-resistant material such as engineering resin in a strip shape and is stretched between the end plates 30 and 30. 31A and 31B are surfaces having a diagonal line as a boundary.

The end plates 30, 30 are arranged in opposite directions, and side plates 33, 33 whose angle gradually changes from one end in the longitudinal direction to the other end are arranged on the end surface in the width direction. , 30 and the side plates 33, 33 are twisted so as to conform to the inclined surfaces, and are recessed surfaces 31A, 31B which are symmetrical with respect to the diagonal line. The torsion angle acts as the wind direction turning angle. Although the angle is arbitrary, it may be selected from a range of about 10 to 50 degrees on average.
That is, as shown in FIG. 21, the rear end (back) in the width direction is high at the left end portion and is curved downward toward the other end (front) in the width direction, so that the rear side is low and the front side is high in the longitudinal direction. In the right end, on the contrary, the rear end (back) in the width direction is low and is curved upward toward the other end (front) in the width direction.

In this example, a flat bottom plate 32 is stretched on the lower surface to form a hollow cross-sectional structure as a whole, and a vertical frame member 35 that runs in the longitudinal direction and a horizontal frame member 36 that runs in the width direction are inside. As a result, the face plate 31 and the end plates 30 and 30, the side plates 33 and 33, and the bottom plate 32 are assembled so as to come into contact with each other, thereby realizing sufficient strength and weight reduction.

  The operation of the second embodiment is basically the same as the operation of the first embodiment, but the airflow direction blowing plates 3, 3 'are not linearly inclined, but are concave curved surfaces. Due to the bank action and the passage action due to the recess, the wind induction effect is better, and both the wind direction conversion characteristics and the blowing characteristics can be improved. 23 and 24 schematically show the flow of wind. The description uses the first embodiment.

The result of having produced the snow fence of 2nd Example, installing in the field, and performing the field experiment is shown. The wind blowing plate has a length of 3800 mm and a width of 513 mm, and a galvanized face plate having a thickness of 1.6 mm is twisted symmetrically with respect to the diagonal so as to be R900 at the center in the longitudinal direction and R2400 at both ends. .
This variable wind direction blowing plate is set on 6 levels of snow protection plate, 2 levels, and the bottom plate is set at an angle of 45 degrees with respect to the horizontal (windward angle 60 degrees, leeward angle 30 degrees, average 45 degrees) In the same manner as in the first embodiment, the snow fences of the present invention having a spacing of 4 m between columns and a height of 4 m were installed in the experiment field over 32 m, and the effect of providing a wind blowing plate was measured. FIG. 25 schematically shows the torsion angle of the variable wind direction blowing plate. The windward (inflow side) angle is 60 degrees, the leeward (outflow side) angle is 30 degrees, and the average is 45 degrees.

1) Wind direction conversion performance: According to the wind speed and wind direction measurement, as shown in FIG. 16 (b), the wind direction conversion angle with respect to the fence (snowproof fence point) in the oblique wind whose inflow wind direction angle θ is parallel to 45 degrees or less. The angle when connecting the straight line from the road to the vicinity of the road shoulder) β was 35 to 50 degrees.
2) Blow-up performance: As a result of the smoke method, it was blown up at about 40 degrees at the blow-out exit and carried outside the width of the road.
3) Wind reduction effect: As a result of measuring the wind speed and direction, it was confirmed that the range in which the wind speed ratio was 0.5 (50% wind reduction) was 6 to 8 times the fence height.
4) Visibility of road: As a result of visual observation of the visibility plate, it was confirmed that a visibility of 130 m or more was secured.
From the above results, it can be seen that the second example has better performance than the first example.

The present invention is not limited to the examples.
1) The variable wind direction blowing plate is not limited to a flat bottom surface, and may be twisted in the same manner as the top surface 31.
2) The airflow direction blowing plate is not limited to the case where the twist is similar at both ends in the plate longitudinal direction, and may be non-similar at both ends in the plate longitudinal direction. This includes the case where a twist is imparted only partially.
For example, only the outflow portion may be twisted, and according to experiments, the average angle (angle at the center in the longitudinal direction of the plate; the same applies hereinafter) is 41.5 degrees, the windward angle is 45 degrees, and the windward angle is 38 degrees. In this case, the wind direction conversion was about 22 degrees with respect to the snow fence and the blowing angle was about 40 degrees.
Moreover, although the inflow part and the outflow part are twisted, you may make a twist angle different. According to the experiment, when the windward (inflow side) angle is plus 10 degrees (55 degrees) and the leeward (outflow side) angle is minus 25 degrees (20 degrees) with respect to the average angle of 45 degrees, the wind direction is changed. Was about 25 degrees with respect to the snow fence and the blowing angle was about 23 degrees. These aspects can also have wind direction conversion performance.
3) The concave curved surface of the torsion surface includes not only a complete arc but also a straight line whose angle is changed stepwise as shown in FIG.

1 is a front view showing a first embodiment of a snowstorm fence according to the present invention. It is sectional drawing which follows the II-II line | wire of FIG. FIG. 3 is a partially enlarged view of FIG. 2. It is a perspective view which shows an example of the baffle direction blowing plate in this invention. (a) is one side view of a wind draft blowing plate, (b) is another side view. It is a top view of a baffle direction blowing plate. It is a partial lack front view of a snow-protection board. (a) is sectional drawing which follows the VII-VII line of FIG. 7, (b) is sectional drawing which follows the VIII-VIII line. It is a partial enlarged front view of a perforated plate. (a) is a perspective view which shows the state at the time of storage of the blowing-type snow fence according to this invention, (b) is the side view. It is a perspective view of the state which looked at the storage state from the road side. It is the perspective view made into the use condition by lifting. It is a vertical side view which shows the effect | action of this invention. It is a top view which shows the effect | action of this invention. (A) is a side view which shows the effect | action of this invention typically, (b) is a top view from the sky. (A) is a torsion angle outline perspective view of the baffle direction blowing plate used for the experiment of 1st Example, (b) is a top view which shows a wind direction conversion performance. It is a perspective view which shows 2nd Example of this invention. It is a side view of 2nd Example. It is the elements on larger scale of FIG. It is a perspective view of the baffle direction blowing plate in 2nd Example. (A) is a right end view of the draft blowing plate, (b) is a cross-sectional view of the center portion, and (c) is a left end view. (A) is a cross-sectional view of a wind draft blowing plate, (b) is a longitudinal side view. It is a vertical side view which shows the effect | action of 2nd Example. It is a top view which shows the effect | action of 2nd Example. It is a torsion angle outline perspective view of a baffle direction blowing board used for the experiment of the 2nd example. (A) is explanatory drawing which shows the effect range of the conventional snow fence, (b) is explanatory drawing which shows the effect range of the snow fence by this invention.

Explanation of symbols

1 support 2 snow protection plate 2A perforated plate 2B non-perforated plate
3, 3 ', 3 "Baffle plate
5 Winch 6 Rope 9A, 9B Link 10 Vertical groove 21 Concavity and convexity 31 Face plate 200,300 Projection shaft 210 Small hole

Claims (7)

A plurality of snow protection plates are provided between the support columns on both sides so as to be foldable and foldable, and on the uppermost snow protection plate, several steps are provided for changing the wind direction and blowing up and blowing away the wind direction . The slanted wind blowing plate is provided with a twist on the upper surface so that one end in the width direction is higher than the other end and one end in the width direction is lower than the other end. Wind-resistant snow fence.   2. A snowstorm fence according to claim 1, wherein the twisting of the airflow direction blowing plate is similar at both ends in the longitudinal direction of the plate.   The twisted wind-resistant snow fence according to claim 1, wherein twisting of the airflow direction blowing plate is dissimilar at both ends in the longitudinal direction of the plate. 4. A snow storm fence according to any one of claims 1 to 3, wherein the upper surface of the wind blowing plate has a straight slope in the width direction. 4. A snowstorm fence corresponding to a slant wind according to any one of claims 1 to 3, wherein the upper surface of the airflow direction blowing plate has a concave curved surface in the width direction. There are two wind direction blowing plates, each wind direction blowing plate has a projecting shaft guided by the longitudinal groove of the column on the end slopes at both ends in the longitudinal direction, and the lower wind direction blowing plate is an angle It is connected to the projecting shaft of the uppermost snow protection plate by the restricted link, and the upper wind direction blowing plate is connected by the angle-restricted link connected to the projecting shaft of the lower wind direction blowing plate. The lifting plate is connected with a rope for suspension, and by pulling it, the upper and lower wind direction blowing plates are inclined upward at a predetermined angle toward the road side, and the wind direction blowing air flow between the upper and lower wind direction blowing plates. The snow fence according to claim 1, wherein a road is formed. The snow-break fence according to claim 1 or 6, wherein a plurality of snow-preventing plates are perforated plates penetrating through the plate surface and provided with a large number of small holes.

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