JP6895618B2 - Avalanche prevention fence cornice formation prevention body and cornice formation prevention method - Google Patents

Description

The present invention relates to a cornice formation prevention body for an avalanche prevention fence that prevents the formation of a cornice on the avalanche prevention fence, and a method for preventing the formation of a cornice.

In snowy areas, avalanche prevention fences are installed on the hillside to prevent avalanches on slopes such as roadsides. As shown in FIG. 15, when the avalanche prevention fence 51 is installed, snowfall accumulates from the ground toward the upper end side of the avalanche prevention fence 51 along the beam member 51A. As the snowfall progresses, a cornice 52 that overtakes the avalanche prevention fence 51 and protrudes outward like an eaves is formed.

When the cornice 52 grows and grows, it breaks due to its own weight and falls as a snow mass, which may induce an avalanche or reach the road and obstruct the passage of pedestrians, passing vehicles, and the like. In order to avoid such a danger, it is necessary to remove the cornice 52 before the formed cornice 52 falls.

However, since this removal work is performed on an inclined surface, the body can be removed by using an aerial work platform, etc. after traffic regulation on the shoulder of the road, or by using an avalanche prevention fence or a rope fixed to a standing tree on the upper side. It is dangerous because the workers do it manually while supporting the rope. In addition, it is not easy to predict when the cornice 52 will fall, it is difficult to determine when the removal work will be carried out efficiently, and in the midwinter, securing personnel and vehicles in consideration of general snow removal work. It is also difficult to remove the cornice 52. Therefore, a technique for preventing the formation of the cornice 52 itself has been proposed (for example, Patent Document 1).

Utility Model Registration No. 3134480

However, no definitive technique has yet been found for the technology to prevent the formation of cornice. The present invention has been made in view of such unsolved problems, and an object of the present invention is to make a cornice formation preventive body for an avalanche prevention fence and a cornice for effectively preventing the formation of a cornice on the avalanche prevention fence. The purpose is to provide a formation prevention method.

(1) The means of the present invention according to claim 1 configured to solve the above-mentioned problems is a cornice formation preventing body provided on the upper end side of the avalanche prevention fence, and is laterally separated from the avalanche prevention fence. A connecting portion made of a plurality of connecting base materials to be erected, a supporting portion made of a supporting material provided upward on the upper end side of each connecting base material, and a plurality of snow caps laid horizontally on the supporting portion. prevention plate and Ri Do from each of the plurality number of sheets of crown snow prevention plate forms a gap by spaced apart vertically, and the lower side of the crown snow preventing plate against the upper side of the crown snow preventing plate It consists of a rearwardly displaced one.
(2) Then, it is preferable that the inclination angle of the snow cover prevention plate can be displaced by an angle adjusting member erected between the support portion and the connecting portion.
(3) Further, the connecting portion may be detachable from the avalanche prevention fence.
(4) Further, the snow cover prevention plate may have slits formed in the vertical direction.
(5) Further, it is preferable that the snow cover prevention plate has a plurality of ventilation holes formed at least in a part thereof.
(6) Further, the snow cover prevention plate may be made of an aluminum plate.
(7) Further, the means of the present invention according to claim 7 , which is configured to solve the above-mentioned problems, is located on the upper end side of the avalanche prevention fence installed on a slope, and a plurality of snow cap prevention plates are moved up and down. A horizontally long gap is formed by arranging the lower snow cap prevention plate so as to be retracted from the upper snow cap prevention plate, and the wind and snow blown down from the mountain side of the slope is allowed to flow through the gap. This is to prevent the formation of a cornice on the upper end side of the avalanche prevention fence.

Since the present invention is configured as described above, it exhibits the following effects.
(1) Since a cornice formation prevention body is erected on the upper end side of the avalanche prevention fence and functions like the roof of the avalanche prevention fence, snow accumulation on the columns and beams of the avalanche prevention fence is suppressed and the cornice is formed. Can be prevented.
(2) Since the tilt angle of the snow cover plate can be displaced by the angle adjusting material erected between the support part and the connecting part, the installation angle of the avalanche prevention fence with respect to the slope, the inclination angle of the slope, and the installation The installation angle of the snow cover plate can be changed according to the snow conditions such as the local climate.
(3) Prevention of cornice formation in which a gap is formed by arranging each of the snow cap prevention plates vertically and vertically, and the lower snow cap prevention plate is displaced rearward with respect to the upper snow cap prevention plate. Since the body is installed on the avalanche prevention fence, the cornice formation prevention body functions like the roof of the avalanche prevention fence, and by guiding the wind and snow to pass through the gap, snow accumulation on the upper end side of the avalanche prevention fence is suppressed. , The formation of cornice can be effectively prevented.
In addition, since a plurality of snow cover plates are arranged one above the other at a distance, snow accretion can be suppressed by dividing the snow cover on the valley side surface of the snow cover plate for each snow cover plate. In addition, the snow accretion is easy to slide, which makes the snow fall work easier.
(4) Since the connecting portion can be attached to and detached from the avalanche prevention fence, a cornice formation prevention body can be installed on the existing avalanche prevention fence.
(5) Since the snow cover plate is configured to form a slit in the vertical direction, a part of the wind and snow can escape from the slit, and the durability of the cornice formation preventive body against the wind pressure is enhanced.
Further, since the snow accretion accumulated on the valley side surface of the cornice formation preventive body is divided at the slit as a boundary, snow accretion on the cornice formation preventive body can be suppressed. Further, even when snow accretion occurs, the snow accretion is small, so that the snow can easily slide and the snow fall work becomes easy.
(6) Since the snow cover plate is configured to form at least a part of the ventilation holes, the durability of the cornice formation prevention body against the wind pressure is enhanced by letting the wind and snow escape from the ventilation holes.
(7) Since the snow cover plate is made of an aluminum plate, it has high thermal conductivity and can use the heat of the sun to melt the snow on the surface of the snow cover plate, which is effective in preventing the formation of cornice. Is the target.

1 to 6 relate to the first embodiment of the present invention, and FIG. 1 is a perspective view showing an overall configuration of an avalanche prevention fence provided with a cornice formation prevention body. It is a front view of the avalanche prevention fence provided with the cornice formation prevention body. It is a rear view of the avalanche prevention fence provided with the cornice formation prevention body. It is a side view of the avalanche prevention fence installed on the slope. It is a partially enlarged view of the cornice formation prevention body shown in FIG. It is a front view of the avalanche prevention fence which shows the deformation example. 7 to 12 relate to the second embodiment of the present invention, and FIG. 7 is a perspective view showing the overall configuration of an avalanche prevention fence provided with a cornice formation prevention body. It is a front view of the avalanche prevention fence provided with the cornice formation prevention body. It is a rear view of the avalanche prevention fence provided with the cornice formation prevention body. It is a side view of the avalanche prevention fence installed on the slope. It is a partially enlarged view of the cornice formation prevention body shown in FIG. It is explanatory drawing which showed the flow of wind and snow schematically. It is a partially enlarged view of the cornice formation prevention body which concerns on 3rd Embodiment. It is a partially enlarged view of the cornice formation prevention body which shows the deformation example. It is explanatory drawing which shows the state which the cornice was formed in the conventional avalanche prevention fence.

Hereinafter, the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6. In the figure, 1 indicates an avalanche prevention fence installed on a slope to prevent an avalanche. Reference numerals 2, 2 and 2 are columns made of H-shaped steel material constituting the avalanche prevention fence 1, and the lower end thereof is embedded in the ground G (FIG. 4). 3, 3, ... Are beam members made of steel pipes laid vertically separated between the columns 2, 2 and 2, and are fastened to the columns 2, 2 and 2 with U bolts and nuts (not shown). There is. The width and height of the avalanche prevention fence 1 may be changed as appropriate according to the slope to be installed and the local conditions.

Reference numeral 4 denotes a cornice formation prevention body erected on the upper end side of the avalanche prevention fence 1. Reference numeral 5 denotes a connecting portion constituting the cornice formation preventing body 4. The connecting portion 5 is a plurality of connecting base materials 5A, 5A, ... Made of an L-shaped steel material having a length of about 620 mm, separated from each other in the lateral direction, and upper 2 It is configured vertically by fastening U bolts 9, 9, ... To the beam members 3 and 3 of the book with nuts (not shown). Reference numeral 6 denotes a support portion constituting the cornice formation preventive body 4, which has a length of about 600 mm and extends upward from the upper end portions of the connecting base materials 5A, 5A, ... Of the connecting portion 5. It is composed of a plurality of support members 6A, 6A, ... Made of L-shaped steel material.

Reference numeral 7 denotes a snow cover plate that constitutes the cornice formation prevention body 4, and the snow cover plate 7 is formed of a horizontally long rectangular aluminum flat plate. The snow cover plate 7 fastens a pair of upper and lower L-shaped ribs 7A, 7A, ... Welded to the back surface to support members 6A, 6A, ... With bolts 7B, 7B .... By doing so, it is horizontally installed on the support portion 6.

8, 8, ... Are reinforcing rods made of round steel that constitute the cornice formation preventing body 4 and are erected between the connecting portion 5 and the supporting portion 6. The upper and lower ends of the reinforcing rods 8, 8, ... Are welded to the connecting base materials 5A, 5A, ..., The support members 6A, 6A, ..., respectively.

The cornice formation preventive body 4 according to the present embodiment has the above-described configuration, and its actions and effects will be described next. As described above, normally, the avalanche prevention fence 1 installed on the sloping ground G has a cornice formed on the upper end side of the avalanche prevention fence 1 due to snow accumulation, but in the present embodiment, a cornice is formed on the upper end side of the avalanche prevention fence 1. Since the prevention body 4 is erected, it functions like the roof of the avalanche prevention fence 1, suppresses the accumulation of snow on the columns 2 and the beam material 3 of the avalanche prevention fence 1, and can prevent the formation of cornice.

Further, since the connecting portion 5 is made detachable from the avalanche prevention fence 1, the cornice formation prevention body 4 can be installed not only on the newly installed avalanche prevention fence but also on the existing avalanche prevention fence.

Further, since the snow cover plate 7 is made of an aluminum plate having high thermal conductivity, the snow attached to the surface of the snow cover plate 7 can be melted by using the solar heat, which is effective in preventing the formation of a cornice. Contribute to

Since the amount of snow accumulated on the mountain side of the avalanche prevention fence 1 differs depending on the conditions such as the installation angle of the avalanche prevention fence 1 with respect to the slope, the inclination angle of the slope, and the climate of the installation area, the support portion 6 with respect to the connecting portion 5 The inclination angle may be set according to these snow conditions. More specifically, it is desirable that the inclination angle is set so that the snow cover plate 7 inclines within a range of about 60 degrees to 70 degrees with respect to the horizontal plane as a guide.

As a modification of the present embodiment, as shown in FIG. 6, the snow cover plate 7 may be provided with vertical slits 7C, 7C, 7C. By letting a part of the wind and snow escape from the slit 7C, the durability of the cornice formation preventing body 4 against the wind pressure is enhanced. Further, since the snow accumulated on the valley side surface of the cornice formation preventive body 4 is divided at the slit 7C as a boundary, snow accretion on the cornice formation preventive body 4 can be suppressed. Further, even when snow accretion occurs, the snow accretion is small, so that the snow can easily slide and the snow fall work becomes easy. The number of slits 7C is not limited to this, and can be appropriately changed according to the conditions of the installation area.

Further, as a modification of the first embodiment, at least a part of the snow cover plate 7 may be formed of a perforated plate. Since a part of the wind and snow can escape from the ventilation holes of the perforated plate, the durability of the cornice formation preventive body 4 against the wind pressure is enhanced. When a plurality of snow cap prevention plates 26 are used as in the second embodiment, it is not always necessary that all the snow cap prevention plates 26 are made of perforated plates, and at least a part of them is made of perforated plates. May be good.

Further, as another modification, in the embodiment, an aluminum plate is used as the snow cover plate, but the same effect can be obtained by using a material having good thermal conductivity without being limited to this. is there. As a matter of course, the present embodiment and the modified examples do not mean that the material of the snow cover plate is limited to such a material having good thermal conductivity, and the snow cover plate is provided with heat. Various materials can be adopted regardless of the conductivity.

Next, a second embodiment of the present invention will be described in detail with reference to FIGS. 7 to 12. In the embodiments and modifications described below, the same components as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, unlike the first embodiment, the connecting portion 22 and the supporting portion 23 of the cornice formation preventing body 21 are formed as separate bodies, and the plurality of supporting members 23A, 23A of the supporting portion 23 are formed separately. , ... Are made of an L-shaped steel material having a length of about 1,220 mm, and are rotatably attached to the upper ends of the connecting base materials 22A, 22A, ... Of the connecting portion 22.

Angle adjusting members 24, 24, ... Made of L-shaped steel constituting the cornice formation preventing body 21 are erected between the connecting portion 22 and the supporting portion 23. Specifically, the connecting base materials 22A, 22A ... And the support members 23A, 23A ... Are provided with a plurality of angle adjusting holes 22B and 23B on the side surfaces thereof, and the angle adjusting members 24, 24, ... Is fastened to the angle adjusting holes 22B and 23B with bolts and nuts (not shown) at the upper and lower ends 24A and 24B, respectively.

Three snow cover plates 26, 26, 26 are horizontally provided on the support portion 23 via ribs 26A, 26A, ..., And by arranging each of them vertically and vertically, about 20 mm. A gap X is formed. Further, the lower bolt 26B is ringed with a plurality of spacers 26C between the support member 23A, and the snow cover plates 26, 26, and 26 are all slightly inclined upward to cover the upper side of the snow. The upper end side of the snow cover plate 26 located on the lower side of the prevention plate 26 is displaced rearward (in the direction closer to the support member 23A), and the lower end portion 26E and the lower portion of the upper snow cover plate 26 are located below. A gap Y of about 20 mm is formed between the upper end portion 26D of the snow cover plate 26 on the side.

The support members 23A, 23A, ... That support the upper and lower snow cover plates 26, 26, 26 are connected to each other using all screw bolts 27, 27, ..., And the cornice formation prevention body 21 due to wind pressure is connected. It prevents twisting. Further, braces 25, 25, ... Are appropriately stretched between the angle adjusting members 24, 24, ... In a bracing manner to give the cornice formation preventive body 21 strength.

The cornice formation preventive body 21 according to the present embodiment has the above-described configuration, and its actions and effects will be described next. In the present embodiment, a plurality of snow cap prevention plates 26, 26, 26 are installed so as to form gaps X and Y, and as shown in FIG. 12, the wind and snow F is guided to pass through the gaps X and Y. Therefore, it is possible to suppress the accumulation of snow on the columns 2 and the beam members 3 of the avalanche prevention fence 1, so that the formation of cornice can be prevented more effectively.

Further, since the plurality of snow cover plates 26, 26, 26 are arranged vertically at intervals to receive the wind, the snow accretion accumulated on the valley side surface of the cornice formation prevention body 21 is the snow cover plate 26. , 26, 26 is divided into each, and snow accretion can be suppressed. Further, even when snow accretion occurs, the snow accretion is small, so that the snow can easily slide and the snow fall work becomes easy.

Further, since a plurality of angle adjusting holes 22B and 23B are bored, by changing the angle adjusting holes 22B and 23B to be used, the support portion 23 with respect to the connecting portion 22 can be provided according to the snow accumulation conditions at the avalanche prevention fence installation location. The tilt angle can be adjusted.

In the second embodiment, the spacer 26C was used to incline the snow cover plates 26, 26, 26, but as a modification, the upper and lower ribs 26A, 26A are inclined by providing a dimensional difference. You may attach it.

In the second embodiment, the angle adjusting member 24 is configured to be able to adjust the inclination angle of the support portion 23 and the connecting portion 22 by making the upper and lower ends displaceable by using the angle adjusting holes 22B and 23B. As a modification, one end of the shaft may be rotatably supported and the other end may be displaceable by using the angle adjusting holes 22B or 23B. Further, the angle adjusting member 24 may be configured to be stretchable and fixed so that the angle can be adjusted.

In the second embodiment, the number of snow cap 26 is set to three, but the number is not limited to this, and can be appropriately changed according to the dimensions of the avalanche prevention fence and the snow conditions such as the climate of the installation area. .. The gaps X and Y between the snow cover plates 26, 26, and 26 are all set to about 20 mm, but this is not limited to this, depending on the dimensions of the avalanche prevention fence and the snow conditions such as the climate of the installation area. It can be changed as appropriate.

Next, a third embodiment of the present invention will be described in detail with reference to FIG.
The structure of the cornice prevention plates 32, 32, ... Is different from that of the second embodiment of the cornice formation preventing body 31 of the present embodiment. Specifically, the upper snow cover plate 32 is welded to the back surface, and a pair of upper and lower L-shaped ribs 32A, 32A having the same height are fastened to the support members 23A, 23A, ... With bolts 26B, 26B and nuts. By wearing it, it is laid horizontally in a state parallel to the support portion 23. Further, the lengths of the ribs 32B and 32B of the middle snow prevention plate 32 are set shorter than the ribs 32A and 32A of the upper snow prevention plate 32, and the ribs 32B and 32B of the middle snow prevention plate 32 are set. On the other hand, the lengths of the ribs 32C and 32C of the lower snow cover plate 32 are set short, and the middle and lower snow cover plates 32 and 32 are horizontally provided on the support portion 23. 32, 32, ... Are displaced rearward (in the direction closer to the support member 23A) as they go downward, and are installed in a staircase pattern.

The cornice formation preventive body 31 according to the present embodiment has the above-described configuration, and its actions and effects will be described next. In the present embodiment, it is not necessary to incline the three snow cover plates 32, 32, 32 when attaching to the support portion 23, and a component such as the spacer 26C of the second embodiment is unnecessary. Since the number of parts is small, construction is easy.

As a modification of the present embodiment, the snow cover plates 36, 36, 36 may be directly fixed to the support portion 23 without using the ribs 32A, 32B, 32C. Specifically, as shown in FIG. 14, the snow-covered prevention plates 36, 36, 36 according to this modified example have upper and lower edge portions 36A, 36B bent inward in a U-shaped cross section, and the upper and lower edges 36, 36, 36 are bent inward. The edges 36A and 36B are fastened to the support member 23A using bolts 36C and nuts. According to this configuration, the snow cover plate 36 can be directly fixed to the support portion 23, so that the strength of the cornice formation prevention body 31 is further increased.

Further, in the present embodiment, the cornice formation preventing body 31 is connected to the avalanche prevention fence 1 by using the U bolt 9, but another connecting method may be used as a modification. That is, one end side of a pair of upper and lower L-shaped brackets 38B provided _{with the reinforcing wall surface 38B 1} is welded to one edge of the pair of connecting base materials 38A constituting the connecting portion 38, and the other end side is connected to the other end side. The base material 38A is detachably fastened with bolts 38C and nuts.

To connect the cornice formation prevention body 31 and the avalanche prevention fence 1, the cornice formation prevention body 31 is placed between the pair of brackets 38B and 38B so that the two beam members 3 and 3 on the upper end side of the avalanche prevention fence 1 fit. This is done by placing and fastening the other connecting base material 38A to the bracket 38B. In the existing avalanche prevention fence 1, the intervals between the horizontally installed beam members 3 and 3 are not unified and there are individual differences. However, according to this connection method, the cornice formation prevention body 31 has various avalanches with different intervals. It can correspond to the preventive fence 1.

Any combination of the above-described embodiments and modifications is also useful as an embodiment of the present invention. The new embodiments resulting from the combination have the effects of the combined embodiments and variants.

1 Avalanche prevention fence 4 Snow cornice formation prevention body 5 Connecting part 5A Connecting base material 6 Supporting part 6A Supporting material 7 Snow capping prevention plate

Claims (7)

A cornice formation preventive body provided on the upper end side of the avalanche prevention fence, the connecting portion composed of a plurality of connecting base materials erected laterally apart from the avalanche prevention fence, and the upper end side of each connecting base material. arranged a supporting portion composed of a support material provided upward, Ri Do and a plurality of crown snow preventing plate to the lateral set to the support portion, each of the plurality number of sheets of crown snow preventing plate spaced vertically in avalanche prevention fence for cornice formation preventing body below the crown snow preventing plate, wherein Rukoto Oh is displaced rearward with respect to form a gap, and upper crown snow preventing plate by. The snow cornice formation prevention body for an avalanche prevention fence according to claim 1, wherein the snow cover plate can be displaced at an inclination angle by an angle adjusting member erected between the support portion and the connection portion. The cornice formation preventive body for an avalanche prevention fence according to claim 1, wherein the connecting portion is removable from the avalanche prevention fence. The snow cornice formation prevention body for an avalanche prevention fence according to claim 1, wherein the snow cover plate has slits formed in the vertical direction. The snow cornice formation prevention body for an avalanche prevention fence according to claim 1, wherein the snow cover plate has a plurality of ventilation holes formed at least in a part thereof. The snow cornice formation prevention body for an avalanche prevention fence according to claim 1, wherein the snow cover plate is made of an aluminum plate. Located on the upper end side of the avalanche prevention fence to be installed on a slope, a plurality of snow cap prevention plates are vertically separated from each other, and the lower snow cap prevention plate is placed retracted from the upper snow cap prevention plate. As a result, a horizontally long gap is formed, and the wind and snow blown down from the mountain side of the slope are allowed to flow through the gap to prevent the formation of a cornice on the upper end side of the avalanche prevention fence. Law.

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