JP7191762B2 - Temporary snow fence - Google Patents

Description

TECHNICAL FIELD The present invention relates to a temporary snow fence, and more particularly to a snow trap type temporary snow fence that is effective when installed at a position away from the railroad tracks.

In areas with heavy snowfall in winter, wind-blown snow accumulates on railroad tracks and hinders train operations. Therefore, in order to reduce the occurrence of snowdrifts caused by the wind, snow fences are sometimes installed beside the tracks. Depending on the method of snow protection, snow protection fences are classified into the snow storage type, the blowing off type, and the blowing off type, and there are permanent fences and temporary fences. The blow-stop type is often installed with a permanent fence because it is highly effective in preventing snow when installed near the track. However, in sections where particularly strong winds blow, when installing a permanent fence, it is necessary to install a fence with extremely high strength, which poses the problem of requiring enormous costs.

On the other hand, a drift-type snow fence is installed several tens of meters away from the track, and by creating a drift in the space between the fence and the track, it is possible to reduce the occurrence of drift on the track. It has the function of letting the wind escape rather than blocking it completely, and it does not require a very high strength, so installation costs can be kept down, but it requires a large space that creates drifts on the side of the track. Therefore, land acquisition is required to make it a permanent fence. Therefore, in sections where strong winds blow, temporary snow fences are installed on land that is rented for a limited period only during the winter, such as fields beside the tracks, to reduce the occurrence of snowdrifts on the tracks. .

JP-A-8-205348

Conventional snowdrift-type temporary snow fences, for example, have horizontal bars suspended between main pillars arranged in a straight line to attenuate the wind. A structure in which two piles driven into the front and rear of the main pillar and the upper part of the main pillar are connected to each other by connecting the pillars with strings to support each main pillar from the front and back. There is
The conventional temporary snow fence with the above structure uses lumber (logs) as the main posts and the stay posts, rope is used as the string that connects the main posts and the stay posts, and the drainboard is also made of plant-derived material. was used. Therefore, the useful life of the fence is short, and since the binding string (rope) is disposable, the long-term cost is high. In addition, there is a problem that the work requires skill and a lot of manpower, and the total work time required for construction is long.

In addition, as an invention related to temporary snow fences, multiple snow protection plates are arranged in parallel in the vertical direction and held by the main pillars. There is a structure that facilitates storage after disassembly (Patent Document 1). However, as described in the publication of Patent Document 1, the above-mentioned snow fence relates to a blow-off type snow fence installed on the shoulder of the road, and is installed at a position several tens of meters away from the track. It is unsuitable for use as a drift-type snow fence.

The present invention has been made in view of the above-mentioned problems, and can be constructed in a short time without requiring many manpower and skills, and can shorten the total working time. The purpose is to provide a temporary snow fence.
Another object of the present invention is to provide a drift-type temporary snow fence that can increase the service life of the constituent parts, thereby reducing costs in the long run. do.

In order to solve the above problems, the present invention
A plurality of main pillars erected at predetermined intervals along a single line, a plurality of nets stretched between each of the plurality of main pillars, and the plurality of main pillars. A temporary snow guard fence having a plurality of stay pillars each supporting from diagonally below and a plurality of piles for fixing the lower ends of each of the plurality of stay pillars to the ground,
Each of the plurality of nets has a bag portion formed at least on the upper edge and the lower edge thereof, and has locking metal fittings at both ends thereof, and is inserted through the bag portions formed on the upper edge and the lower edge. stretched in a substantially vertical posture by at least two horizontal bars horizontally placed on the
Fastening screws protruding in the horizontal direction are implanted at predetermined height positions of the plurality of main pillars,
The locking fitting has a circular hole with a size that allows the head of the fastening screw to pass through, and a circular hole with a width that is smaller than the head and greater than the diameter of the shaft of the fastening screw. A daruma hole having an elongated hole provided along the horizontal direction above and a communicating portion connecting the circular hole and the elongated hole is formed, and the locking fitting is the fastening screw. The shaft portion is configured to be coupled to the corresponding main column by the fastening screw while positioned in the elongated hole.

According to the temporary snow fence having the above configuration, horizontal rods (support pipes) having locking fittings at both ends are inserted into the bag portions formed at the upper and lower edges of the net, and the horizontal rods are By lifting it up and engaging the bolt holes in the locking metal fittings at the ends with the fastening screws (pin bolts) provided on the main pillars, the horizontal rods can be easily hung between the main pillars to allow the net to hang down. be able to. In addition, since the horizontal rod can be fixed to the main pillar simply by turning and tightening the fastening screw (pin bolt) engaged with the locking fitting, the temporary snow protection can be completed in a short period of time without the need for a lot of manpower or skill. A fence can be constructed and the total work time can be shortened.

Here, desirably, the long hole of the daruma hole provided in the locking metal fitting is curved so that the center bulges upward.
According to such a configuration, the horizontal rods (support pipes) inserted through the bag portion of the net are locked at the two ends of the main pillars. Even if the pole is supported in an inclined posture with respect to the horizontal plane, the tangential line to the pin bolt becomes horizontal, so that the horizontal bar can be evenly supported and the snow guard fence can be constructed in a stable state.

Preferably, each of the plurality of nets has a third bag portion formed between an upper edge and a lower edge, and each of the third bag portions is provided with the locking fittings at both ends. 3 horizontal rods are respectively inserted, and the locking metal fittings at both ends of the third horizontal rod are coupled to fastening screws provided at corresponding positions of the main pillar.
As a result, a third bag portion is formed between the upper edge and the lower edge of the net, and the third horizontal bar is inserted through this bag portion and coupled to the main pole by locking metal fittings at both ends. Even if the length of the net in the height direction is long, it is possible to prevent the net from greatly expanding due to the wind and lowering the snowproof effect.

Preferably, the plurality of piles are anchor piles each having a helical blade formed at the bottom,
The lower end of the stay pillar and the anchor pile have a U bolt with a chevron-shaped head and two bolt insertion holes into which the two legs of the U bolt are inserted, respectively. It is connected by a plurality of sets of fittings with two nuts screwed onto the legs of the book.
According to the above-described configuration, since the anchor piles each having a helical blade formed at the bottom thereof are used, the piles for fixing the stand-up posts can be easily driven into the ground, and the heads thereof are chevron-shaped. Since a plurality of sets of fittings having U bolts are used to connect the lower part of the brace and the pile, the strength of the connection with the brace can be increased.

Further, desirably, the anchor pile has a circular cross-section at least at the top,
The U-bolt is formed so that the distance between the two legs is 1.5 to 2.5 times the diameter of the anchor pile,
The two bolt insertion holes formed in the base plate are formed as elongated holes along the same direction as the alignment of the two legs of the U-bolt,
The base plate is joined to the lower end of the stay pillar, and the inside of the U-bolt is joined to the upper part of the anchor pile, and the stay pillar and the anchor pile are joined by the joint fitting. .
According to the configuration as described above, even if the inclination (angle) of the pile and the stay pillar is misaligned, the leg of the U bolt moves inside the long hole, thereby absorbing the inclination deviation of the pile and the stay pillar. Both can be strongly combined, thereby increasing the stability of the installed snow fence.

According to the temporary snow fence and the construction method thereof according to the present invention, it can be constructed in a short time without requiring many manpower and skill, and the total work time can be shortened. In addition, it is possible to increase the service life of the parts that constitute the temporary snow fence, which has the effect of reducing costs in the long term.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows one Embodiment of the temporary snow fence which concerns on this invention. Fig. 2 is an enlarged perspective view of a main part showing an example of a connection structure between a main pole and left and right standoff poles that constitute the temporary snow fence of the embodiment; Fig. 3 is an enlarged perspective view of a main part showing the relationship between main posts, support pipes, and nets that constitute the temporary snow fence of the embodiment; It is an enlarged perspective view which shows the relationship between the main pillar of the edge part which comprises the temporary snow fence of embodiment, and a net. (A) is a front view showing an example of a support pipe (horizontal bar) that constitutes the temporary snow guard fence of the embodiment, and (B) is an enlarged perspective view of the end. (A) is a front view showing a configuration example of an anchor pile that constitutes the temporary snow protection fence of the embodiment, and (B) is an enlarged perspective view showing a state in which the anchor pile is installed underground. FIG. 10 shows a configuration example of connecting means (angle U-bolt) of a stand-up post to an anchor pile, (A) is an exploded front view of the connecting means, and (B) is a plan view showing a base plate.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the temporary snow fence which concerns on this invention, and its construction method is described, referring drawings.
FIG. 1 shows a perspective view of one embodiment of a temporary snow fence according to the present invention. As shown in FIG. 1, the temporary snow guard fence of this embodiment has nets 12A to 12E for attenuating the wind between a plurality of main pillars 11A to 11F arranged in a straight line so that they are in a substantially vertical posture. is stretched. Each of the main posts 11A to 11F is provided with two standoff posts 13A and 13B extending obliquely downward from a position slightly above the intermediate portion.

Although not particularly limited, the main pillars 11A to 11F and the standoff pillars 13A and 13B are formed of prismatic pipes. In addition, at the lower ends of the main pillars 11A to 11F, pedestals that form a trapezoid when viewed from the side are provided. there is
On the other hand, the lower ends of the standoff pillars 13A and 13B are connected to anchor piles driven into the ground as will be described later, and are firmly fixed to the ground via the anchor piles to support the main pillars 11A to 11F from the front and rear. is configured as

Further, on the sides of the main posts 11A and 11F located at both ends of the main posts 11A to 11F opposite to the net, there are two side stay posts 13C and 13D extending obliquely downward to the left and right from the upper ends. are provided respectively, and are configured to support the entire fence from the left and right via the main posts 11A and 11F by the side braces 13C and 13D.
The upper ends of the side stay posts 13C and 13D are rotatably connected by pin bolts 15 to brackets 14 fixed to the upper ends of the main posts 11A (11F), as shown in FIG. Although not shown, the upper ends of the front and rear standoff posts 13A and 13B are also rotatably connected to intermediate portions of the main posts 11A to 11F by pin bolts. As a result, the stay posts 13A, 13B and 13C, 13D are configured to be foldable.

As shown in FIGS. 2 and 3, pin bolts 17A and 17B are provided on the front and rear surfaces of each main column 11 for locking metal fittings 61 at the ends of the support pipes 16 from which the net 12 hangs. planted respectively. A pair of nuts are screwed to each of the pin bolts 17A and 17B, and the ends of the support pipe 16 are connected to the main column 11 by holding the locking fitting 61 between the pair of nuts.
On the other hand, the nets 12A to 12E are made of highly durable synthetic resin fibers, and the transmittance is selected according to the assumed wind speed in the installation section. Specifically, in the section where the assumed wind speed is 7 to 13 m/sec, it is preferable to select a material with a transmittance of about 60%, for example.

Each of the nets 12A to 12E is provided with bag portions 21a and 21b having a size through which a pipe having a diameter of about 5 cm can be inserted along the upper end and the lower end, respectively, and a bag of the same size is provided in the intermediate portion. A portion 21c is provided along the horizontal direction. Each of the nets 12A to 12E is suspended by the support pipe 16 inserted through the bag portion 21a, and is configured to be restrained from bending by the pipes inserted through the bag portions 21b and 21c.
Each of the bag portions 21a to 21c is made of strong fabric such as canvas, and is sewn while holding the ends of the net.

Furthermore, as shown in FIG. 3, reinforcing portions 22a and 22b are formed at the left and right ends of each of the nets 12A to 12E. A plurality of holes 23 through which strings are passed are formed in the reinforcing portions 22a and 22b at predetermined intervals. A pair of locking pins 30 are implanted on the main posts 11A to 11F.
Therefore, by passing a string through each of the holes 23 and tying it around the locking pin 30 of the corresponding main pole 11, both ends of each of the nets 12A to 12E can be locked to the main poles 11A to 11F. As a result, when the net is exposed to the wind, it is configured so that both ends are not separated from the main pillars 11A to 11F due to large bending.

As the string to be passed through the holes 23 at both ends of the net, it is preferable to use a string that has a stretch margin and is strong against pulling, such as a rubber string whose surface is covered with fibers. By using such a string, when a strong wind is received, the string stretches, allowing the wind to escape to some extent, thereby avoiding collapse of the fence and damage to the net.
It is also possible to use a strong string that does not have stretchability as the string to be passed through the holes 23 at both ends of the net. and the main pillar. By doing so, it is possible to avoid collapsing of the fence and damage of the net when receiving a strong wind.

Next, the support pipes (horizontal bars) 16 that are inserted through the bag portions 21a to 21c to suspend the nets 12A to 12E and suppress deflection will be described with reference to FIG.
As shown in FIG. 5(A), the support pipe 16 is, for example, an iron pipe having a diameter of about 5 cm and a length of about 2 m. . As shown in FIG. 5(B), the locking fittings 61A and 61B have a circular large-diameter hole 62a slightly below the central portion and on the tip side, and a substantially horizontal hole 62a above the large-diameter hole 62a. A modified daruma hole 62 is formed, which includes an elongated hole 62b formed by a slant and a communicating portion 62c connecting the large diameter hole 62a and the elongated hole 62b.

As shown in FIG. 2, the large-diameter hole 62a is large enough to allow the nut 17C on the head of the pin bolt 17A, which is embedded in the side surface of the main pillars 11A to 11F, to be inserted therethrough. 62c is designed to have a width smaller than the diameter of the nut 17C on the head of the pin bolt 17A and slightly larger than the body.
As a result, after one end of the support pipe 16 is lifted and the nut 17C screwed to the head of the pin bolt 17A is inserted into the large diameter hole 62a of the locking fitting 61A or 61B, the long hole is passed through the communicating portion 62c. By moving the body portion of the pin bolt 17A to 62b, the locking fitting 61A can be locked to the pin bolt 17A while preventing it from coming off.
It is to be noted that the screwed nut 17C is loosened and fitted into the deformed pothole 62, and when the position of the tip of the support pipe 16 is determined, the nut 17C is tightened so that the locking fittings 61A and 61B are attached to the main pillar 11A. It can be firmly fixed to ~11F.

If the long hole 62b is formed in the daruma hole 62 as described above, even if the distance between the upper ends of the two main pillars to which both ends of the support pipe 16 are locked varies, the difference can be absorbed. Both ends of the support pipe 16 can be connected to the two main pillars, and the work time can be shortened.
Further, the elongated hole 62b of the deformed daruma hole 62 is curved so that the center swells slightly upward. As a result, even if the support pipe 16 is tilted with respect to the horizontal plane and supported by the support pipe 16 being installed in a state in which the heights of the upper ends of the two main pillars to which both ends of the support pipe 16 are locked are deviated, , the support pipe 16 can be evenly supported. Therefore, the snow fence can be stabilized.

For example, if the support pipe 16 is supported in an inclined state with respect to the horizontal plane, the long hole 62b will also be inclined. On the other hand, the support pipes 16 are loaded by the weight of the net 12 and the wind pressure. Therefore, if the elongated hole 62b is not curved but flat and inclined, a force component is generated and more force acts on the lower side of the pipe.
However, if the long hole 62b is curved so as to bulge slightly upward, the tangential line to the pin bolts 17A and 17B becomes horizontal, so that no force component is generated and the support pipe 16 can be supported almost evenly on the left and right sides. can be done. In addition, if the elongated hole 62b is curved, there is an effect of suppressing the displacement of the support pipe 16 in the axial direction.

Next, with reference to FIG. 6, the construction of anchor piles for fixing the above-mentioned stay pillars 13A and 13B to the ground and the joint structure between the stay pillars and the anchor piles will be described.
In the temporary snow fence of this embodiment, as shown in FIG. ), it is configured to be cast obliquely to the ground. The anchor pile 18 can be driven by rotating it using an electric tool.

Further, the anchor pile 18 is driven with its end portion exposed by about 30 to 50 cm, and two U-bolts 91 having mountain-shaped heads and a base plate are attached to the exposed portion as shown in FIG. 7(A). As shown in FIG. 6(B), the stay post 13 is connected to the anchor pile 18 by a joint 19 consisting of a joint 92 and a pair of nuts 93A and 93B. The base plate 92 is formed with a notch 92c with which the stay post 13 is engaged.
The distance between the pair of legs 91a and 91b of the U-bolt 91 is wider than that of a normal U-bolt. A female threaded portion is formed on the distal end side of 91a and 91b. Further, as shown in FIG. 7(B), the base plate 92 is formed with long holes 92a and 92b through which the legs 91a and 91b of the U-bolt 91 can be inserted and which are elongated in a direction parallel to the body of the U-bolt 91. It is

By using two sets of fittings 19 configured as described above, as shown in FIG. The anchor pile 18 and the stay post 13 are held between the bolt 91 and the base plate 92, and the legs 91a and 91b of the U-bolt 91 are moved to appropriate positions within the elongated holes 92a and 92b. can be strongly bonded.
In addition, since the U-bolt 91 is mountain-shaped, when the nuts 93A and 93B are turned and tightened, the U-bolt 91 receives a reaction force from the anchor pile 18, and the leg portions 91a and 91b are pushed into the elongated holes 92a and 92b. Move to the appropriate position by sliding. Therefore, manual position adjustment is not required, and work can be carried out efficiently.
If the distance between the pair of legs 91a and 91b of the U-bolt 91 is too large, the fitting 19 will become large. Therefore, it is desirable to set the diameter to 1.5 to 2.5 times the pipe diameter of the anchor pile 18 .

Next, a construction method of the temporary snow fence of the above embodiment will be described.
When constructing a temporary snow fence, first determine the position (installation line) where you want to install the fence, and then place the specified A pair of anchor piles 18 are driven at a pitch (net width + α). In addition, the nets 12 having the support pipes 16 inserted through the bag portions 21a to 21c are prepared.
Next, the main pillar 11 is erected at the center of the pair of anchor piles 18 while the stay pillars 13A and 13B are opened, and the lower ends of the stay pillars 13A and 13B are joined to the anchor pile 18 using the coupling fittings 19 described above. As for the main posts 11 at both ends of the fence having the stay posts 13C or 13D, the lower ends of the stay posts 13C and 13D are connected to the anchor piles 18 driven for the stay posts 13C and 13D.

After that, the end of the support pipe 16 inserted into the upper bag portion 21a of the net 12 is hooked on the hook of a lifting rod having a hook at the tip to lift it, and the locking fitting 61 at the end of the support pipe 16 is lifted. A nut 17C screwed to the head of a pin bolt 17A at the upper end of the main column 11 is inserted into the large-diameter hole 62a. The locking fitting 61 at the opposite end of the support pipe 16 is also fitted to the pin bolt of the other main column 11 in the same manner. Similarly, for the support pipe 16 inserted through the bag portions 21b and 21c in the middle and the lower part of the net 12, the locking metal fittings 61 at the ends are attached to the heads of the pin bolts in the middle and the lower part of the main column 11 ( (including nut).

Next, the ladder is leaned against the erected main post 11, the nuts 17C screwed on the ends of the pin bolts 17A and 17B are turned and tightened, and the locking fittings 61 at the ends of the support pipes 16 are mainly tightened. It is fixed to the upper end of the pillar 11 . Similarly, locking metal fittings 61 at the ends of the support pipes 16 inserted through the bag portions 21b and 21c in the middle and lower portions of the net 12 are also fixed to the main poles 11. As shown in FIG. After that, strings are passed through eyelet holes provided in the side portions of the net 12, respectively, and are tied around the locking pins 30 of the main pillars 11.例文帳に追加The construction of a series of temporary snow fences is completed by the above work.
Moreover, dismantling work of the said temporary snow guard fence can be implemented by a procedure reverse to the above.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications and changes are possible. For example, in the above embodiment, prismatic pipes are used as the main posts 11A to 11F and the standoff posts 13A, 13B, but cylindrical round pipes may be used.
Also, in the above embodiment, anchor piles having spiral blades are used, but as for the piles, hammer-driven piles may be used as in the conventional case.
In addition, the temporary snow fence of the present invention is not limited to the snow fence for railroad tracks, and can be used for the snow fence for roads.

11A-11F Main post 12A-12E Net 21a, 21b Bag portion 13A-13C Standing post 15 Pin bolt 16 Support pipe 17A, 17B Pin bolt 18 Anchor pile 19 Joint fitting 30 Locking pin 61A, 61B Locking fitting 62 Deformed pothole 91U bolt 92 base plate

Claims (5)

A plurality of main pillars erected at predetermined intervals along a single line, a plurality of nets stretched between each of the plurality of main pillars, and the plurality of main pillars. A temporary snow guard fence having a plurality of stay pillars each supporting from diagonally below and a plurality of piles for fixing the lower ends of each of the plurality of stay pillars to the ground,
Each of the plurality of nets has a bag portion formed at least on the upper edge and the lower edge thereof, and has locking metal fittings at both ends thereof, and is inserted through the bag portions formed on the upper edge and the lower edge. stretched in a substantially vertical posture by at least two horizontal bars horizontally placed on the
Fastening screws protruding in the horizontal direction are implanted at predetermined height positions of the plurality of main pillars,
The locking fitting has a circular hole with a size that allows the head of the fastening screw to pass through, and a circular hole with a width that is smaller than the head and greater than the diameter of the shaft of the fastening screw. A daruma hole having an elongated hole provided along the horizontal direction above and a communicating portion connecting the circular hole and the elongated hole is formed, and the locking fitting is the fastening screw. A temporary snow protection fence, wherein a shaft is positioned in the elongated hole and connected to the corresponding main pillar by the fastening screw. 2. The temporary snow guard fence according to claim 1, wherein the elongated hole of the daruma hole provided in the locking metal fitting is curved so that the center bulges upward. Each of the plurality of nets has a third bag portion formed between an upper edge and a lower edge, and the third bag portion has a third horizontal bar having the locking fittings at both ends. 3. The fastener according to claim 1 or 2, wherein said locking metal fittings at both ends of said third horizontal bar are coupled to fastening screws provided at corresponding positions of said main column. Temporary snow fence. The plurality of piles are anchor piles each having a helical blade formed at the bottom,
The lower end of the stay pillar and the anchor pile have a U bolt with a chevron-shaped head and two bolt insertion holes into which the two legs of the U bolt are inserted, respectively. The temporary snow fence according to any one of claims 1 to 3, characterized in that the temporary snow fence is connected by a plurality of sets of fittings having two nuts screwed onto the legs of the book. At least the upper portion of the anchor pile has a circular cross section,
The U-bolt is formed so that the distance between the two legs is 1.5 to 2.5 times the diameter of the anchor pile,
The two bolt insertion holes formed in the base plate are formed as elongated holes along the same direction as the alignment of the two legs of the U-bolt,
The base plate is joined to the lower end of the stay pillar, and the inside of the U-bolt is joined to the upper part of the anchor pile, and the stay pillar and the anchor pile are joined by the joint fitting. The temporary snow fence according to claim 4.

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