Net protection device

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

[Technical Field]

[0001] The present disclosure relates to a net protection device for protecting a rockfall protection net stretched across a slope from corners of the posts of the rockfall protection fence. [Background technology]

[0002] Conventionally, there are known technologies such as rockfall protection nets and rockfall protection fences that are installed on cut slopes or mountainsides that are at risk of rockfall to prevent rocks from falling onto roads. For example, Patent Document 1 discloses an invention of a scaffolding used when installing a rockfall protection net. Furthermore, Patent Document 2 discloses an invention of a rockfall protection fence that can prevent the mesh of the wire mesh from widening or breaking due to falling rocks. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-008761 [Patent Document 2] Japanese Patent Application Publication No. 2018-199934 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, pocket-type rockfall protection nets are used on steep slopes, while rockfall protection fences are often used on gentle slopes. In some cases, rockfall protection nets and rockfall protection fences are installed adjacent to each other. In such cases, the rockfall protection net is installed over the rockfall protection fence to prevent falling rocks from slipping through the gap between the two. However, when installed in this manner, as shown in FIG. 9, the rockfall protection net 51 comes into contact with the sharp corners 53a (the ends of the H-beams facing the road) of the posts of the rockfall protection fence 52, which can cause the wire mesh of the rockfall protection net 51 to bend and deform, or to be damaged by friction, such as torn, or even to develop holes.

[0005] Therefore, an object of the present disclosure is to provide a net protection device that can protect a rockfall protection net from the corners of the support posts of a rockfall protection fence when the rockfall protection net is installed to cover the rockfall protection fence. [Means for solving the problem]

[0006] In order to solve the above problems, the net protection device disclosed herein comprises an umbrella portion and an attachment portion that allows the umbrella portion to be attached and detached freely to a support post of a rockfall protection fence, and is characterized in that when the attachment portion is attached to the support post, the umbrella portion covers at least a portion of the upper end of the support post. [Effects of the Invention]

[0007] According to the net protection device of the present disclosure, the umbrella portion is configured to cover at least a portion of the upper end of the pole, which has the effect of protecting the rockfall protection net 51 from the corners of the pole. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram illustrating one embodiment of a net protection device of the present disclosure. FIG. [Figure 2] 2 is an exploded perspective view of the net protection device of FIG. 1 as seen from the rear side. FIG. [Figure 3] (a) is a plan view of the umbrella portion, and (b) is a bottom view. [Figure 4] (a) is a front view of the umbrella part, (b) is a side view, and (c) is an end view along line AA. [Figure 5] FIG. 1A is a rear view of the mounting portion, and FIG. [Figure 6] (a) Cross-sectional view of the mounting part taken along line BB, (b) Cross-sectional view of line CC, and (c) Cross-sectional view of line DD. The dashed lines indicate the placement of other components (umbrella and support). [Figure 7] 10A and 10B are explanatory diagrams showing the movement of the umbrella portion. [Figure 8] 10A and 10B are schematic diagrams showing modified examples of the umbrella portion. [Figure 9] FIG. 1 is a schematic diagram illustrating a conventional problem. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present disclosure will be described below with reference to the drawings. The size notations in the description are examples of preferred values, 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. Additionally, the side of the umbrella portion 2 that abuts against the rockfall protection net 51 will be referred to as the front side, and the opposite side will be referred to as the back side. The net protection device 1 is made of metal, and the rockfall protection net 51 is made of metal wire formed into a mesh.

[0010] As shown in Figures 1 and 2, a net protection device 1 of the present disclosure comprises an umbrella portion 2 and an attachment portion 3 that detachably attaches the umbrella portion 2 to a support post 53 of a rockfall protection fence 52. The support post 53 of the rockfall protection fence 52 is an H-beam with an H-shaped cross section. The support post 53 is installed so that a flange 54 of the H-beam faces the road. When the attachment portion 3 is attached to the support post 53, the umbrella portion 2 covers at least a portion of the upper end of the support post 53.

[0011] 3 and 4, the umbrella portion 2 includes a main body 23 formed in a spherical crown shape, a shaft 21 that pivotally supports the main body 23 so that it can tilt freely, and a bracket 24 for attaching the shaft 21 to the main body 2. Both ends of the shaft 21 are welded to the bracket 24, and the bracket 24 is welded to the main body 23. The surface of the main body 23 is finished into a smooth spherical surface. The main body 23 is preferably about 20 cm in diameter, but can be large enough to sufficiently cover at least a portion of the upper end of the support 53 depending on the cross-sectional shape of the support 53.

[0012] 5 and 6, the mounting part 3 is formed from a hollow rectangular timber. A pair of first slits 31 that engage with flanges 54 of the support posts 53 are provided on both the left and right side surfaces of the mounting part 3, and a second slit 32 that engages with a web 55 of the support post 53 is formed on the back surface of the mounting part 3. The first and second slits 31 and 32 open toward the lower end of the mounting part 3.

[0013] The first and second slits 31, 32 are all formed to the same length and are provided to suppress rattle when the net protection device 1 is attached to the support 53. The net protection device 1 can be easily attached to the support 53 by aligning the first slit 31 with the flange 54 of the support 53, aligning the second slit 32 with the web 55 of the support 53, and inserting the first and second slits 31, 32 into the flange 54 and web 55 of the support 53. In addition, the net protection device 1 can be easily removed from the support 53 by removing the first and second slits 31, 32 from the flange 54 and web 55 of the support 53.

[0014] Bearings 33 that receive the shaft 21 of the umbrella part 2 are formed on both the left and right side surfaces of the upper end of the mounting part 3. The bearings 33 support the shaft 21 so that it can rotate around its axis. In addition, a pair of bolt holes 34 are formed on the back and front surfaces of the upper end of the mounting part 3. When a bolt 11 is inserted into the bolt holes 34, the shaft 21 arranged in the bearings 33 is prevented from coming out.

[0015] As shown in Figure 7, the umbrella portion 2 is provided so as to be able to tilt freely around the axis of the shaft portion 21. This allows the umbrella portion 2 to tilt freely in response to the movement of the rockfall protection net 51, making it possible to reduce friction between the surface of the umbrella portion 2 and the rockfall protection net 51. 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 by tilting it toward the mountain side or the valley side, friction can be reduced.

[0016] FIG. 8 shows a modified example of the umbrella portion 2. In FIG. 8, the mounting portion 3 is omitted. As shown in FIG. 8(a), the main body 23 of the umbrella portion 2 can be formed in a semi-cylindrical shape. The curved surface formed on the surface of the main body 23 can protect the rockfall protection net 51. Also, as shown in FIG. 8(b), the main body 23 can be formed in a box shape with the inclination of the side surface 23b relative to the bottom surface 23a at approximately 95 to 150 degrees. By making the fold of the box shape (the inclination of the side surface 23b relative to the bottom surface 23a) less than 90 degrees, friction with the rockfall protection net 51 can be reduced, and the rockfall protection net 51 can be protected.

[0017] In Figure 8(c), the main body 23 is formed in a spherical crown shape, and the umbrella portion 2 is placed directly on the support 53. An engagement groove (not shown) that engages with the flange 54 or web 55 can be formed on the outer periphery of the main body 23, or the umbrella portion 2 can be adhered to the support 53 with an adhesive (not shown) or the like. In this case, the engagement groove or adhesive functions as a fixing part that directly fixes the umbrella portion 2 to the support 53. In Figure 8(c), the net protection device 1 has a simpler configuration, which makes it possible to reduce manufacturing costs.

[0018] According to the net protection device 1 configured as described above, the umbrella portion 2 is disposed between the rockfall protection net 51 and the support pole 53 and covers at least a portion of the upper end, thereby protecting the rockfall protection net 51 from the corners 53a of the support pole 53. The attachment portion 3 allows for detachable attachment to the support pole 53, allowing for retrofitting to existing support poles 53. Furthermore, since the umbrella portion 2 is tiltable toward the mountain side or the valley side using the axis 21 as a tilting axis, friction with the surface of the umbrella portion 2 can be reduced even when the rockfall protection net 51 sways due to wind and snow. Furthermore, by forming the umbrella portion 2 into a spherical crown shape, a semi-cylindrical shape, or a box shape with a fold angle less than 90 degrees, the degree of contact between the rockfall protection net 51 and the umbrella portion 2 can be reduced, for example, even when the rockfall protection net 51 is subjected to wind force or the weight of snow.

[0019] The present disclosure is not limited to the above-described embodiment, and the shape and configuration of each part may be appropriately changed without departing from the spirit of the invention. For example, the main body 23 of the umbrella part 2 in Fig. 8(c) may be formed in a semi-cylindrical shape as shown in Fig. 8(a) or a box shape in which the side surface 23b is inclined at an angle of 95 to 150 degrees relative to the bottom surface 23a as shown in Fig. 8(b). [Explanation of symbols]

[0020] 1 Net protection device 2 Umbrella section 3 Mounting part 11 volts 21 Shaft 23 Main body (a: bottom, b: side) 31 First slit 32 Second slit 33 Bearing 34 bolt holes 51 Rockfall protection net 52 Rockfall protection fence 53 Support (a: corner) 54 flange 55 Web

Claims

1. A net protection device that protects a rockfall protection net from a support post of the rockfall protection fence in an area where the rockfall protection fence is covered with the rockfall protection net, a mount portion for mounting the umbrella portion to an upper end portion of the support pole; A net protection device characterized in that when the mounting portion is attached to the support pole, the umbrella portion is positioned between the rockfall protection net and the upper end of the support pole, covering at least a portion of the upper end of the support pole.

2. The net protection device according to claim 1 , wherein the mounting portion detachably mounts the umbrella portion to the support pole.

3. The umbrella portion includes a main body portion formed in a spherical crown shape and a shaft portion disposed in a radial direction of the main body portion, The net protection device according to claim 1 or 2, wherein the mounting portion includes a bearing portion that receives the shaft portion.

4. The support pillar is an H-shaped steel beam, A mesh protection device as described in any one of claims 1 to 3, wherein the mounting portion includes a first slit that engages with the flange of the H-beam and a second slit that engages with the web portion of the H-beam.

5. A net protection device that protects a rockfall protection net from a support post of the rockfall protection fence in an area where the rockfall protection fence is covered with the rockfall protection net, Equipped with an umbrella section, the umbrella portion includes a fixing portion that fixes the umbrella portion to an upper end portion of the support pole, A net protection device characterized in that when the umbrella portion is fixed to the support pole, the umbrella portion is positioned between the rockfall protection net and the upper end of the support pole, covering at least a portion of the upper end of the support pole.

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