JP2023153552A - Net protective device - Google Patents

Abstract

To provide a net protective device that can protect a stone fall protective net from a corner part of a support pillar of a stone fall guard fence.SOLUTION: A net protective device of the present disclosure comprises an umbrella part 2 and a fitting part 3 detachably mounting the umbrella part 2 to a support pillar 53 of a stone fall guard fence 52. The umbrella part 2 has a body part 23 and a shank 21 tiltably supporting the body part 23. The fitting part 3 has a bearing part 33 receiving the shank 21. The net protective device 1 is constituted so that the umbrella part 2 covers at least one portion of an upper end part of the support pillar 53 in the state where the fitting part 3 mounts to the support pillar 53.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a net protection device for protecting a rockfall protection net stretched over a slope from the corners of pillars of a rockfall protection fence.

BACKGROUND ART Conventionally, technologies such as rockfall protection nets and rockfall protection fences that are installed on cut slopes or mountain sides where there is a risk of rockfall to prevent rocks from falling onto roads are known. For example, Patent Document 1 discloses an invention of a scaffold used when installing a rockfall protection net. Further, Patent Document 2 discloses an invention of a rockfall protection fence that can suppress the opening and tearing of wire mesh due to falling rocks.

JP2021-008761A Japanese Patent Application Publication No. 2018-199934

By the way, in general, a pocket-type rockfall protection net is used for steep slopes, and a rockfall protection fence is often used for gentle slopes, and the rockfall protection net and rockfall protection fence are often placed adjacent to each other. In some cases, it may be installed. In such cases, a protective net is installed over the protective fence to prevent falling rocks from falling through the gap between the rockfall protective net and the rockfall protective fence. However, when installed in this way, as shown in FIG. There was a risk that the rows of wire that make up the wire mesh would be bent and deformed, or that damage such as lacerations would occur due to rubbing, or that holes would open.

Therefore, an object of the present disclosure is to provide a net protection device that can protect the rockfall protection net from the corners of the pillars of the rockfall protection fence when the rockfall protection net is installed to cover the rockfall protection fence.

In order to solve the above problems, a net protection device of the present disclosure includes an umbrella part and a mounting part that removably attaches the umbrella part to the pillar of a rockfall protection fence, and in a state where the mounting part is attached to the pillar, The umbrella portion is characterized in that it covers at least a portion of the upper end portion of the support column.

According to the net protection device of the present disclosure, since at least a portion of the upper end of the support column is covered by the umbrella portion, it is possible to protect the rockfall protection net 51 from the corner of the support support.

1 is a schematic diagram illustrating an embodiment of a network protection device of the present disclosure; FIG. FIG. 2 is an exploded perspective view of the net protection device of FIG. 1 viewed from the back side. They are (a) a top view of an umbrella part, and (b) a bottom view. They are (a) a front view of an umbrella part, (b) a side view, and (c) an AA line end view. They are (a) a rear view and (b) a right side view of the attachment part. They are (a) a BB sectional view, (b) a CC sectional view, and (c) a DD sectional view of the attachment portion. Broken lines indicate the arrangement of other members (umbrella, support). It is an explanatory view showing movement of an umbrella part. It is a schematic diagram which shows the modification of an umbrella part. FIG. 2 is a schematic diagram illustrating conventional problems.

Embodiments of the present disclosure will be described below based on the drawings. The size notation in the description is an example of a preferable numerical value, and the size can be changed as appropriate depending on the situation. In the following description, the side of the net protection device 1 facing the road (valley side) will be referred to as the front side, and the opposite side (mountain side) will be referred to as the back side. Further, the side of the umbrella section 2 that comes into contact with the rockfall protection net 51 is the front surface, and the opposite surface is the back surface. The net protection device 1 is made of metal, and the rockfall protection net 51 is formed of metal wires into a net shape.

As shown in FIGS. 1 and 2, the net protection device 1 of the present disclosure includes an umbrella section 2 and a mounting section 3 that detachably attaches the umbrella section 2 to a support 53 of a rockfall protection fence 52. The pillars 53 of the rockfall protection fence 52 are made of H steel with an H-shaped cross section. The support column 53 is installed so that the H-steel flange 54 faces the road side. In a state where the attachment part 3 is attached to the support column 53, the umbrella part 2 covers at least a part of the upper end of the support column 53.

As shown in FIGS. 3 and 4, the umbrella part 2 includes a main body part 23 formed in a spherical crown shape, a shaft part 21 that pivotally supports the main body part 23 in a tiltable manner, and a shaft part 21 for attaching the shaft part 21 to the main body part 2. A bracket 24 is provided. Both ends of the shaft portion 21 are welded to a bracket 24, and the bracket 24 is welded to the main body portion 23. The surface of the main body portion 23 is finished into a smooth spherical surface. The main body portion 23 is preferably provided with a diameter of about 20 cm, but depending on the cross-sectional shape of the support column 53, the main body portion 23 can be provided with a size that can sufficiently cover at least a portion of the upper end portion of the support column 53.

As shown in FIGS. 5 and 6, the mounting portion 3 is formed from a square piece with a hollow interior. A pair of first slits 31 that engage with the flanges 54 of the support columns 53 are provided on both left and right side surfaces of the attachment section 3, and a second slit 32 that engages with the webs 55 of the support columns 53 is provided on the back surface of the attachment section 3. is formed. The first and second slits 31 and 32 are open toward the lower end of the attachment portion 3.

The first and second slits 31 and 32 are all formed to have the same length, and are provided so as to suppress rattling when the net protection device 1 is attached to the support column 53. Aligning the first slit 31 with the flange 54 of the strut 53, aligning the second slit 32 with the web 55 of the strut 53, and inserting the first and second slits 31 and 32 into the flange 54 and web 55 of the strut 53. Accordingly, the net protection device 1 can be easily attached to the support column 53. Moreover, by extracting the first and second slits 31 and 32 from the flange 54 and web 55 of the support column 53, the net protection device 1 can be easily removed from the support column 53.

Bearing portions 33 for receiving the shaft portion 21 of the umbrella portion 2 are formed on both left and right side surfaces of the upper end side of the mounting portion 3 . The bearing portion 33 supports the shaft portion 21 rotatably around the axis. Furthermore, a pair of bolt holes 34 are formed at the upper end of the mounting portion 3 on the back and front sides. When the bolt 11 is inserted into the bolt hole 34, the shaft portion 21 disposed in the bearing portion 33 is prevented from coming off.

As shown in FIG. 7, the umbrella portion 2 is provided so as to be tiltable around the axis of the shaft portion 21. As shown in FIG. Therefore, the umbrella section 2 freely tilts in accordance with the movement of the rockfall protection net 51, and the friction between the surface of the umbrella section 2 and the rockfall protection net 51 can be reduced. Generally, the rockfall protection net 51 is pulled toward the mountain side or the valley side by wind force, the weight of snow, etc., so friction can be reduced by tilting it toward the mountain side or the valley side.

FIG. 8 shows a modification of the umbrella section 2. In FIG. 8, the mounting portion 3 is omitted from illustration. As shown in FIG. 8(a), the main body portion 23 of the umbrella portion 2 can be formed into a semi-cylindrical shape. The rockfall protection net 51 can be protected by the curved surface formed on the surface of the main body part 23. Further, as shown in FIG. 8(b), the main body portion 23 can be formed into a box shape with the side surfaces 23b inclined at about 95 degrees to 150 degrees with respect to the bottom surface 23a. By making the box-shaped fold (the slope of the side surface 23b with respect to the bottom surface 23a) less than 90 degrees, the friction with the rockfall protection net 51 can be reduced and the rockfall protection net 51 can be protected.

In FIG. 8(c), the main body portion 23 is formed into a spherical crown shape, and the umbrella portion 2 is directly placed over the support column 53. It is also possible to form an engagement groove (not shown) on the outer peripheral edge of the main body part 23 to engage with the flange 54 or the web 55, or to bond the umbrella part 2 to the support column 53 with an adhesive (not shown) or the like. . At this time, the engagement groove and the adhesive function as a fixing part that directly fixes the umbrella part 2 to the support column 53. In FIG. 8C, since the network protection device 1 has a simpler configuration, it is possible to reduce the manufacturing cost.

According to the net protection device 1 having the above configuration, the umbrella portion 2 is disposed between the rockfall protection net 51 and the pillars 53 and covers at least a part of the upper end, so that rockfall protection is provided from the corners 53a of the pillars 53. The network 51 can be protected. At this time, since it can be detachably attached to the support column 53 using the attachment part 3, it can be installed on the existing support column 53 as an afterthought. Moreover, since the umbrella part 2 is provided so as to be tiltable toward the mountain side or the valley side using the shaft part 21 as a tilting axis, even if the rock fall protection net 51 sways due to the influence of wind and snow, the friction with the surface of the umbrella part 2 is reduced. be able to. Furthermore, by making the umbrella part 2 into a spherical crown shape, a semi-cylindrical shape, and a box shape with a fold less than 90 degrees, for example, even if the rock fall protection net 51 is subjected to wind force or snow weight, falling rocks can be prevented. The degree of contact between the protective net 51 and the umbrella section 2 can be reduced.

The present disclosure is not limited to the embodiments described above, and the shapes and configurations of the lower parts can be changed as appropriate without departing from the spirit of the invention. For example, the main body part 23 of the umbrella part 2 shown in FIG. 8(c) may be shaped like a semi-cylindrical shape as shown in FIG. It is also possible to form it into a box shape.

1 Net protection device 2 Umbrella part 3 Mounting part 11 Bolt 21 Shaft part 23 Main body part (a: bottom surface, b: side surface)
31 First slit 32 Second slit 33 Bearing part 34 Bolt hole 51 Rockfall protection net 52 Rockfall protection fence 53 Post (a: corner)
54 Flange 55 Web

Claims (4)

comprising an umbrella part and a mounting part for detachably attaching the umbrella part to a support of a rockfall protection fence,
The net protection device is characterized in that, in a state in which the attachment portion is attached to the support column, the umbrella portion covers at least a portion of an upper end portion of the support support. The umbrella portion includes a main body portion formed in a spherical crown shape and a shaft portion arranged in a radial direction of the main body portion,
The net protection device according to claim 1, wherein the attachment portion includes a bearing portion that receives the shaft portion. The support column is made of H steel,
The net protection device according to claim 1 or 2, wherein the attachment portion includes a first slit that engages with a flange of the H steel, and a second slit that engages with a web portion of the H steel. Equipped with an umbrella section,
The umbrella part includes a fixing part that fixes the umbrella part to a support of a rockfall protection fence,
A net protection device characterized in that, in a state where the umbrella section is fixed to the support column, the umbrella section covers at least a part of the upper end of the support column.

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