JP6113473B2 - Protective fence - Google Patents

Description

  The present invention relates to a protective fence installed on a slope, and preferably relates to a protective fence effective for preventing avalanches.

As this type of protective fence, for example, there is an avalanche protective fence 200 provided with a fall prevention member on the slope mountain side of the fence body (see FIG. 4).
The avalanche protection fence includes a fence main body 201 provided at a right angle with respect to the slope S, and installation ropes 202a and 202b that are connected to the upper and lower parts of the fence main body 201 and support the fence main body 201 by suspending it from above the slope. And on the slope mountain side of the fence body 201, a fall prevention member 203 extending obliquely from the fence body 201 toward the nearest ground, and supporting the fence body 201 from the slope mountain side, The fence body 201 is prevented from falling over the mountain side.

  By the way, in the avalanche prevention fence 200 having the above structure, in the structure in which the fall prevention member 203 is provided on the slope mountain side to avoid the fall of the fence body 200, stress concentrates on the fall prevention member 203 due to the weight of snow. Therefore, there is a possibility that cracks and cracks may occur in the welded part in a place with a lot of snow. For this reason, at the time of designing, not only the rigidity of the fall-preventing member itself but also an unnecessarily strong design that takes into account uncertain factors such as the amount of snowfall has been forced.

Further, according to the guard fence 200 having the above structure, the fence main body is held at a right angle to the slope S, so that a snow can easily be formed. That is, as shown in FIG. 5, since the snow (dotted line B portion in FIG. 5) that originally falls on the slope in a gentle and natural shape is dammed by a right-angle protective fence, the dammed snow is (In the direction of arrow A in FIG. 5). Accordingly, the amount of snow accumulation is greater at the border of the fence body than that at a position away from the fence, and as shown in FIG.
Therefore, with conventional protective fences, the height of the fence must be higher than the actual amount of snow in order to avoid the occurrence of avalanches due to the collapse of snowfalls. I could not say.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a protective fence that can be suitably applied even in a place where there is a lot of snow while suppressing the formation of a snow ridge.

In order to solve the above problems, the present invention provides:
A first support fixed to the slope;
A second column provided on the sloped valley side with respect to the first column and extending substantially upward in the vertical direction;
A transverse member disposed along each of the columns to be supported by the first column and the second column;
It is provided with.

In this invention comprised in this way, the horizontal member is arrange | positioned along these each support | pillar so that it may be supported by the 1st support | pillar and the 2nd support | pillar. In addition, the first support column is provided with respect to the slope, and the second support column extends substantially upward in the vertical direction on the slope valley side with respect to the first support column. In other words, the upper side of the protective fence forms a surface that is almost perpendicular to the slope.
The angle between the first support column and the slope is preferably in the range of 90 degrees to 30 degrees in the valley side direction and 20 degrees in the mountain side direction, and from 90 degrees to 20 degrees in the valley side direction. More preferably, the angle is within a range of up to 10 degrees, and most preferably 90 degrees.
Therefore, the whole of the first support column and the second support column is formed in a “shape” in a side view. With such a configuration, during snowfall, the snow accumulates naturally in the fence, the amount of snow in the fence becomes uniform, and the formation of snow canopies is suppressed.

  Further, the first support column and the second support column may be joined to each other, and a structure may be provided that includes a fall prevention member that prevents the fall of each of the columns to the sloped valley side.

According to this structure, since it has the fall prevention member which prevents the fall of each support | pillar to the slope valley side, the fall of this protection fence is prevented also at the time of snow accumulation exceeding a fence height.
In addition, although the installation position of the fall prevention member is not ask | required, Preferably, it is good to install in the slope trough side rather than the 1st support | pillar.

  Moreover, the structure which is an extension part which extends below from the said 2nd support | pillar and can reach the said slope may be sufficient as the said fall prevention member.

  In this configuration, since the fall prevention member is disposed on the extension of the second support column, the second support column and the fall prevention member can be manufactured as a single member, and the structure can be simplified.

  Moreover, the structure which has a connection member which connects the said 1st support | pillar and the said fall prevention member may be sufficient.

  In this structure, since the 1st support | pillar and the said fall prevention member are connected by the connection member, the rigidity of this protection fence with respect to the weight of snow can be improved.

  Moreover, it is preferable that the said connection member is a plate-shaped member laid flat on the said slope.

  According to this configuration, the load applied to the first support column and the fall-preventing member is distributed on the slope, and the snow in the initial stage of snow accumulation is heavily applied to the connecting member, so that the protective fence is attracted downward on the slope. Immediately stabilize the posture.

Further, the lateral member is composed of one or more of a plurality of members arranged side by side at a constant interval, a plate-like member continuous continuously, or a net-like member. It may be configured.
Here, the plurality of members arranged in parallel with a certain interval means that the plurality of members are arranged with a certain interval along the first support column and the second support column. As the plurality of members, a plate-like member (plate-like member), a square member, a rod-like member, and the like are used.

  As described above, according to the present invention, since the amount of snow in the fence is uniform, the formation of snow ridges is suppressed, and the height of the fence can thereby be set to an appropriate height equal to the height of snow. Therefore, it is possible to provide a protective fence that can be suitably applied to places with a large amount of water.

The front view of the protection fence shown to this Embodiment. The top view of the protection fence shown to this Embodiment. The side view of the protection fence shown to this Embodiment. The side view which shows a prior art. The figure which shows the formation principle of a snow crab. The figure which shows the shape of a snowfall.

Hereinafter, an embodiment in which the protective fence according to the present invention is applied to an avalanche-preventing protective fence will be described.
The protective fence 1 has, for example, a first support column 20 fixed at a right angle to the slope S, and a second support column 30 extending upward in the vertical direction on the slope valley side with respect to the first support column 20. Is provided. These first support column 20 and second support column 30 form a “U” shape in a side view. In addition, the protective fence 1 is supported by the first support column 20 and the second support column 30 so that the horizontal member 40 arranged along each support column and the support columns 20 and 30 with respect to the slope valley side. A fall prevention member 50 for preventing the fall is provided.

The first support column 20 and the second support column 30 are made of a member having rigidity such as galvanized H-section steel, for example, and are provided one by one at intervals in the slope width direction.
First, the second support column 30 will be described. The second support column 30 extends in a straight line toward the inclined surface S, and the lower half of the second support column 30 functions as the fall prevention member 50. That is, the fall prevention member is an extending portion that extends vertically downward from the second column and reaches the slope. In the present embodiment, the second column 30 and the fall prevention member 50 are provided as a single unit. It is made of steel material. In the following description, the H-section steel material 30a in FIGS. 2 and 3 that also serves as the fall prevention member 50 is referred to as a second support column 30 unless otherwise specified.

On the other hand, a part of the lower side of the slope S is embedded and fixed, and the upper side of the first support column 20 is exposed on the slope S. Further, the tip portion is welded and fixed to an intermediate portion of the second support column 30 or a position slightly lower than that. That is, in the second support column 30, a position lower than the position where the first support column 20 is fixed by welding functions as the fall prevention member 50.
Preferably, the first support column 20 is connected to the height of the second support column 30 within a range of 30% to 50% from the lower end thereof.

  Further, a plate-like (sled) connection plate 70 as a connection member is provided by welding and fixing from the lower end of the second support column 30 to the ground surface portion of the first support column 20. The connection plate 70 is wider than the first support column 20 and the second support column 30, and both the support columns 20 and 30 are connected together via the connection plate 70 on the slope surface portion.

Further, after the reinforcing brace 43 is assembled on the sloped valley side of the second support column 30, the lateral member 40 is assembled to the first support column 20 and the second support column 30.
The horizontal member 40 is composed of a plurality of steel pipes 41 and is assembled horizontally and in multiple stages from the slope mountain side from the lower side of the first support column 20 to the upper end of the second support column 30. In the figure, reference numeral 42 denotes a mounting bolt such as a U bolt for fixing the steel pipe 41 to the support columns 20 and 30.

  The construction example of the protective fence 1 will be described. First, a sled is attached to a transportation device using a pulley and a rope, and materials are carried into the construction site. Subsequently, after determining the fence position, an earth and sand anchor using an excavator is driven at right angles to the slope S. Moreover, the lower end of the 1st support | pillar 20 is inserted in this earth and sand part anchor, and the 1st support | pillar 20 is fixed using the bolt for fastening. Next, after installing the second support column 30 in the vertical direction, the brace 43 is assembled between the second support columns 30, 30, the steel pipe 41 is used as the transverse member 40, and the first support column 20 and the mounting bolt 42 are used. The assembly work is finished on the second support column 30.

Next, the state of snow accumulation on the protective fence 1 will be described in order from the beginning of snow accumulation.
In the initial stage of snow accumulation, snow accumulates on the lower side of the transverse member 40. Since the lower side of the horizontal member 40 is held at a right angle to the slope S, a large amount of snow accumulated on the slope S is received along the slope S widely and evenly. In addition, the snow at this time eventually becomes a compacted (consolidated) state, and this dense and heavy snow mass is heavily applied to the lower side of the first support column 20, the lower end of the second support column 30 and the connection plate 70. Then, pull this protective fence 1 down the slope and quickly stabilize its posture.

  Further, when the snowfall progresses and the snow cover height reaches the height exceeding the second support column 30, it becomes easy to form a snow trap. However, in the present protective fence 1, the upper side of the lateral member 40 is changed to the slope S by the second support column 30. On the other hand, since it is held vertically, snow accumulates naturally in the fence from the bottom to the top. Therefore, the amount of snow in the fence becomes uniform, and the formation of snow ridges is suppressed.

  Further, as the snow cover height increases, the force to push down the protective fence 1 toward the sloped valley becomes stronger, but this force is received by the fall prevention member 50 provided at the lower end of the second column 30. Therefore, the posture of the protective fence 1 is stably maintained even during snow accumulation exceeding the second support column 30.

  As described above, the protective fence 1 shown in the present embodiment accumulates snow in a natural form from the lower part to the upper part. For this reason, the amount of snow in the fence is uniform, making it difficult for the snow leopard to grow. Therefore, the fence height can be set to the same appropriate height as the snow cover height. Moreover, since the protective fence 1 is stabilized early by positively using the weight of snow in the early stage of snow accumulation, high installation stability can be obtained by these synergistic effects. Therefore, it can be used even in places with a large amount of snow.

  Further, in the present protective fence 1, it is difficult to form a snowfall, and it is difficult to remove the snowfall, or the frequency thereof can be reduced. In addition, it is possible to prevent the occurrence of a secondary disaster due to the collapse of a snow pit, which is advantageous in terms of installation.

The above-described embodiment is merely an example, and details thereof can be changed according to various specifications.
For example, in the above-described embodiment, a plurality of steel pipes 41 are assembled horizontally and in multiple stages as the transverse member 40, but instead of the steel pipe 41, a solid or hollow one may be used. A hollow steel pipe is preferable in terms of reducing the weight of the protective fence. In addition, the continuous plate-like thing is a single plate (plate) or a plurality of plates (plates) joined without a gap, and the net-like thing is a mesh or rhombus A net-like object made of wire mesh or fiber. Further, the transverse member can be H-shaped steel. In addition, preferably, in a plurality of members arranged side by side with a certain interval, which are horizontal members, since the uppermost member is a plate-like member installed vertically, the top area is narrow and snow accumulation is suppressed. can do.

  Further, in this embodiment, a pair of support columns 20 and 30 are provided on the left and right sides of the horizontal member 40. However, the horizontal member may be supported only by the support columns provided on the left and right and the center, or in the center. Good. Also, the number of columns can be changed according to various specifications, such as four or five. Moreover, in this Embodiment, although the 1st support | pillar 20 and the 2nd support | pillar 30 were H-shaped steel materials, it is an example to the last, The shape, material, etc. can be selected.

  In the present embodiment, the second support column 30 and the overturn prevention member 50 are provided integrally, but the overturn prevention member 50 prevents the first support column 20 and the second support column 30 from falling over the sloped valley side. It only has to be provided at the position to obtain, and its shape and installation position can be changed. Moreover, in this Embodiment, although the 1st support | pillar 20 and the fall prevention member 50 were connected with the sled-shaped connection plate 70, it can also connect with a pipe-shaped reinforcement material.

  In the present embodiment, the first support column 20 and the second support column 30 are configured as separate members. For example, the first support column 20 and the second support column 30 are configured as one structure, and the inclined surface thereof. A fall prevention member 50 may be separately provided on the valley side.

  In the present embodiment, the lower side of the first support column 20 is embedded and fixed on the slope S. However, when the slope is made of a hard rock or the like, it may be fixed using an anchor bolt or the like. Specifically, an excavation hole is formed on the slope using a rock drill, and then an anchor bolt is inserted into the excavation hole and a solidifying agent such as mortar or concrete is injected to fix the anchor bolt. In addition, a base plate or the like is separately provided at the lower end of the first support column 20, and the first support column 20 is bolted to the anchor bolt via the base plate. Thus, the fixing method of the 1st support | pillar 20 can employ | adopt an appropriate construction method according to the occasional condition.

  The protective fence 1 can be used not only as an avalanche prevention fence described above but also as a protective fence for earth and sand, gravel, falling rocks and the like.

DESCRIPTION OF SYMBOLS 1 Protective fence 20 1st support | pillar 30 2nd support | pillar 30a H-shaped steel material 40 Horizontal member 41 Steel pipe 42 Mounting bolt 43 Brace 50 Fall prevention member 70 Connection plate 200 Avalanche protection fence 201 Rail main body 202a Upper installation rope 202b Lower part Installation rope 203 Fall prevention member C Snow fence S Slope

Claims (4)

A first support fixed to the slope;
A second column provided on the sloped valley side with respect to the first column and extending substantially upward in the vertical direction;
A transverse member disposed along each of the columns to be supported by the first column and the second column;
The first support column and the second support column are joined to each other, and the fall prevention member prevents the fall of each of the columns to the slope valley side,
A connecting member that connects the first support column and the fall prevention member;
A protective fence characterized by comprising 2. The protective fence according to claim 1 , wherein the fall prevention member is an extending portion that extends downward from the second support column and reaches the slope. The protective fence according to claim 1 or 2 , wherein the connecting member is a plate-like member placed flat on the slope. The lateral member is composed of one or more of a plurality of members arranged side by side at a constant interval, a plate-like member that is continuous continuously, or a net-like member. The type protective fence according to any one of claims 1 to 3 .

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