JPH0451602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a blow-off snow fence used in snowy regions to protect traffic routes such as roads and railways from snow accumulation.

[Background of the invention]

In areas with heavy snowfall, securing transportation routes during the winter is the most important issue from all social perspectives.
There is a need for inexpensive and effective snow prevention measures.

Conventionally, snow fences used on roads, railways, etc. are installed upwind of roads, railways, etc., and there are two types of snow fences: a blow-off type and a blow-off type. The snowdrift method reduces the amount of snow on the road by reducing the wind speed and depositing snow on the road and in front or behind the snow fence. In the blow-off type, the cross-sectional shape of the fence is set so that snow is blown toward the ground surface, thereby changing the amount of snow on roads or facilities adjacent to the lee of the snow protection fence.

The present invention relates to the latter, that is, the blow-off type.

In order to maintain an effective blow-off effect in a blow-off snow fence, it is necessary to change the angle of the snow-protection board and the main column for holding the snow-protection board depending on the wind speed, snow quality, etc.

In addition, such snow fences are ineffective unless they are installed at a certain distance from roads, railways, etc., so the installation of snow fences and the above-mentioned angle conversion are limited due to site and topographical issues. In many cases, it is necessary to do so within the specified width.

Conventionally, in response to such requests, the following snow prevention fences have been tried. That is, the snow protection board is inclined upward toward the windward side, and the blowing elevation angle of the upper snow protection board is set to become smaller in sequence with respect to the blowing elevation angle of the lower snow protection board.

However, in conventional snow protection fences of this kind, the blowing elevation angle of the upper snow protection board is set to become smaller sequentially with respect to the blowing elevation angle of the lower snow protection board, so first, the blowing elevation angle of the upper snow protection board is The induced wind does not blow towards the ground surface, but instead passes above the ground surface. In other words, the wind induced by the upper snow prevention board hardly contributes to the blowing effect. Furthermore, the wind guided by the lower snow protection plate blows at an angle close to perpendicular to the ground surface, which not only does not contribute to the blowing effect, but also causes snow to accumulate. In addition, it is not possible to take in the collective wind and send strong winds to the blow-off section at the bottom. That is,
Conventional snow fences of this type have extremely low blow-off efficiency.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a snow prevention fence in which the angle of the snow prevention plate can be easily adjusted and the snow can be blown away efficiently.

[Summary of the invention]

The above purpose is to construct a large number of struts arranged at appropriate intervals along roads, railways, etc., sub-struts to support the struts, and multi-stage construction between adjacent struts. In a snow prevention fence consisting of a large number of snow prevention boards: the support pillar is rotatably pivoted to the ground at its lower end; the sub-support pillar is pivotally connected to the ground at its lower end, and its upper end slides on the support support. Installation possible;
A large number of snow protection boards are constructed in such a way that the blowing angle of the upper row is made larger than the blowing angle of the lower row, and the lower end of the snow protection board is brought close to or in contact with the surface of the snow protection board below. This is achieved by a snow fence with special features.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the present invention.

In this example, the support 2 is placed on the ground 4 at its lower end.
The lower end of the secondary support 6 is pivotally connected to the ground 4, and the upper end is slidably attached to the support 2; A large number of snow protection plates 8a to 8f are arranged such that the corners are successively enlarged and the lower ends of the snow protection plates 8a to 8f are brought close to or in contact with the surface of the snow protection plate 8 below.
has been erected.

This makes it possible to obtain an excellent blow-off effect.

This example will be explained in more detail below.

In FIG. 2, 2 is a support. The support column 2 is rotatably pivoted to the ground 4. For pivot mounting, concrete 10 is placed on the ground 4, a fixture 12 is buried in the concrete 10, and the lower end of the support column 2 is attached to the fixture 12 with bolts 14. When the bolt 14 is tightened, the strut body 2 becomes fixed, and when the bolt 14 is loosened, the strut body 2 becomes rotatable.

In this example, as shown in FIG. 3, the support 2 is a hollow square rod with one side cut out. However, the material is not limited to this, and a round bar may also be used. It may be selected appropriately taking into consideration the load strength applied to the support column 2, economical efficiency, etc.

Through holes 16 are formed in the side surface of the support column 2 at appropriate intervals in the longitudinal direction.

6 is an auxiliary strut body. The lower end of the sub-support column 6 is rotatably pivoted to a fixture 18 buried in concrete 10 cast in the ground 4 at a position slightly away from the installation position of the column 2 to the concrete on the windward side. be. Then, it is tightened with bolts 20. As in the case of strut body 2, bolt 2
When the bolt 20 is tightened, the sub-strut body 6 becomes fixed, and when the bolt 20 is loosened, the sub-strut body 6 becomes rotatable.

The sub-strut body 6 is a means for receiving the load applied to the strut body 2. The upper end of the auxiliary strut body 6 is connected to the strut body 2
It is slidably attached to. In this example, as shown in FIG.
The slider 22 is provided at the upper end of the sub-support column 6 via
is slidably fitted to the support column 2. Of course, other methods may be used as long as they can be slidably attached. The slider 22 and the hinge 24 are tightened with bolts 26.

Snow protection plates 8a to 8f are attached to the support column 2.

In this example, a screw hole 28 is provided near the upper end of the side surface of the snow protection plate 8. The snow protection plate 8 is attached to the support column 2 by passing bolts 30 through the through hole 16 and screw hole 28 of the support column 2. However, it may be attached by providing a protrusion on the side surface of the snow protection plate 8, inserting the protrusion into a through hole of the support column 2, and tightening it with a nut or the like. Further, holes 29 are provided at appropriate intervals in the side surface of the snow protection plate 8 from the upper end to the lower end. In this example, a flat plate is used as the snow protection plate, but a plate with ridges may also be used. In the case of a board with ridges, the ridges may be fine.

The snow protection plates 8a to 8f have blowoff angles at the upper level that are sequentially larger than blowoff angles at the lower level. That is, the blowing angle of the snow protection board 8b is larger than that of the snow protection board 8a, and the blowing angle of the snow protection board 8c is larger than that of the snow protection board 8. Snow protection board 8d, 8
The same applies to e and 8f. In addition, snow protection board 8
The lower end of a is in contact with the surface of the snow protection plate 8b. That is, no gap is created between the lower end of the snow protection plate 8a and the surface of the snow protection plate 8b. Further, the lower end of the snow protection plate 8b is brought into contact with the surface of the snow protection plate 8c. The same applies to the snow protection plates 8c to 8f.

Reference numeral 34 is an angle adjustment stay, in which a large number of holes 36 are opened at equal intervals. It is fastened to the main column body 2.

Reference numeral 40 is a connecting rod, which has a large number of through holes 42.
is opened, and is pivotally connected to the angle adjustment stay 34 so as to be rotatable.

Further, the connecting rod 40 and each of the snow protection plates 8a to 8f are pivotally connected by pins 44.

In this example, the distance between the attachment point of the snow protection plate 8 to the column body and the attachment point of the snow protection plate 8b to the column body 2 is the distance between the attachment point of the snow protection plate 8b to the column body 2 and the attachment point of the snow prevention plate 8b to the column body 2. The distance is made larger than the distance between the attachment point to the support column 2.

Next, a method of adjusting the blowing angle of the snow fence according to this example will be explained.

The initial state is shown in FIG. The state shown in FIG. 4 is the state when snow protection is not necessary (summer, etc.), and the snow protection boards are spaced apart so that the windward side can be seen from the road.

To change from the state shown in FIG. 4 to the state shown in FIG. 7, remove the pin 44, rotate the snow protection plates 8a to 8f, and move the snow protection plates 8a to 8f as shown in FIG.
Let the blow-off angle of f be the desired angle.

Next, the bolts 14 and 20 of the fixtures 12 and 18
, and rotate the support 2 as shown in FIG. At this time, the slider 22 slides on the support column 2, and the sub-support column 6 also rotates. After rotating the support column 2 by a desired angle, the connecting rod 40 is attached to the snow protection plate at an appropriate position using a pin 44.

When adjusting the angle in this way, it is preferable to make the line connecting the lower ends of the snow protection plate as straight as possible. Thereby, the occurrence of turbulent flow such as Karman vortex flow on the leeward surface of the snow protection plate can be suppressed as much as possible. Moreover, it is preferable that the extension of the line be at the rear of the leeward side of the road, railway, etc.

〔Effect of the invention〕

Since the present invention is configured as described above, all of the wind induced by the snow prevention board contributes to blowing away, so a superior blowing effect can be obtained compared to conventional snow prevention fences, and it can be used on roads, railways, etc. It is possible to sufficiently prevent the accumulation of snow. .

Further, the angle of the snow protection board can be adjusted within a limited width range.

[Brief explanation of drawings]

Figures 1 to 7 relate to one embodiment of the present invention, with Figure 1 being a conceptual diagram, Figures 2 and 4 to 7 being a side view, and Figure 3 being a partial plan view. be. 2... Support column, 4... Ground, 6... Sub-support column, 8, 8
a~8f...Snow protection board, 10...Concrete, 12...
Mounting tool, 14... Bolt, 16... Through hole, 18... Fixing tool, 20... Bolt, 22... Slider, 24... Hinge, 26... Bolt, 28... Threaded hole, 29... Hole, 30
...Bolt, 34...Angle adjustment stay, 36...Hole, 3
8... Bolt, 40... Connecting rod, 44... Pin.

Claims (1)

[Claims] 1. A large number of support pillars arranged at appropriate intervals along roads, railways, etc., sub-support pillars to support the support pillars, and a large number of support pillars installed in multiple stages between adjacent support pillars. In a snow prevention fence consisting of a snow prevention plate: a support body is rotatably pivoted to the ground at its lower end; a secondary support body is pivoted to the ground at its lower end;
Its upper end is slidably attached to the support; the blow-off angle of the upper stage is made larger in sequence than the blow-off angle of the lower stage, and the lower end of the snow protection board is brought close to the surface of the snow protection board below it, or A snow prevention fence characterized by a large number of snow prevention boards installed in contact with each other.