Lower protective fence to prevent intrusion

Abstract

To provide a guard fence for preventing intrusion below a guard fence, the height of which can be adjusted according to the installation location of the guard fence and which can be firmly fixed in the gap between the lower part of the guard fence and the ground. [Solution] The lower protective fence intrusion prevention fence 1 comprises a fence body 2 fixed to the lower part of a protective fence 10 erected on the ground G via posts 12, an upper fixing device 3A for fixing the fence body 2 to the protective fence 10, and a lower fixing device 4 for fixing the fence body 2 to the ground. The fence body 2 has a mesh section 22 made up of wires 21 arranged in a grid pattern.

Description

[Technical Field]

[0001] This invention relates to a lower intrusion prevention fence for preventing people, animals, etc. from entering through the gap between the protective fence and the ground surface. [Background technology]

[0002] Generally, guard fences are installed along the boundaries of industrial sites and adjacent land boundaries such as residential areas in order to prevent intruders and to clarify the boundaries (see, for example, Patent Document 1). Also, in areas where electrical facilities such as substations and transmission towers are located, there is a risk that an intruding animal may come into contact with the high-voltage electrical equipment, causing a power supply disruption, and it is extremely dangerous if a human unknowingly comes into contact with the equipment, so guard fences are essential around such facilities.

[0003] A typical protective fence consists of multiple posts erected on a foundation built in the ground, with a mesh-like fence body erected between these posts. With such a protective fence, gaps are created between the fence body and the ground, but these gaps are usually small enough to prevent people and animals from entering. However, small animals and children can sometimes slip through the bottom of the protective fence and enter the premises, even if the gap is smaller than expected. Therefore, it is considered to attach a protective net to the opening at the bottom of the protective fence to block the gap at the bottom (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-46854 [Patent Document 2] Japanese Patent Application Publication No. 2017-2676 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the gap between the protective fence and the ground varies depending on the installation location. Furthermore, soil and sand between the foundations may be washed away by rainwater or other factors, causing the gap between the fence body and the ground to become larger than it was at the time of construction. However, the protective net shown in Patent Document 2 is intended for use as a road protective fence, and its height cannot be freely adjusted during or after construction depending on the installation location. Furthermore, in the case of a protective fence surrounding a power transmission tower in a mountainous area, if the protective net is not firmly fixed to the ground, there is a risk that wild boars and other animals may dig through the ground underneath and invade the premises.

[0006] The purpose of this invention is to provide a guardrail bottom intrusion prevention fence whose height can be adjusted according to the installation location of the guardrail and which can be firmly fixed in the gap between the bottom of the guardrail and the ground. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a lower intrusion prevention fence that is installed in the gap between the lower part of a protective fence and the ground, and comprises a fence body that is fixed to the lower part of a protective fence that is erected on the ground via supports, an upper fixing device for fixing the fence body to the protective fence, and a lower fixing device for fixing the fence body to the ground, and the fence body has a mesh portion made up of wires arranged in a grid pattern.

[0008] In the above-mentioned protective fence for preventing intrusions below, it is preferable that the fence body has a furring strip in which the lower edge of the mesh section is bent three-dimensionally, and that the lower fixing device has a U-shaped enclosing section that is inserted into the boundary between the furring strip and the mesh section and surrounds the furring strip, a pair of fixing pieces that are provided at both ends of the enclosing section and come into contact with the ground, and a stake-shaped member that is inserted into the ground through a hole provided in the fixing piece.

[0009] It is preferable that the above-mentioned lower protective fence intrusion prevention fence further comprises a sheet body that is laid on the ground, and that the sheet body is fixed to the ground together with the fixing pieces by the stake-shaped members.

[0010] In the above-mentioned lower protective fence to prevent intrusion, the upper fixing device preferably has a band-shaped pressure plate and a screw member for screwing the pressure plate, and the fence body is preferably fixed to the protective fence by screwing in the screw member while the fence body is clamped between the lower part of the protective fence and the pressure plate.

[0011] In the above-mentioned protective fence for preventing intrusion below the protective fence, the upper fixing device has a pair of clamping fittings and a bolt member that bolts the clamping fittings from the outside, and it is preferable that the fence body is fixed to the protective fence by screwing in the bolt member while the lower part of the protective fence and the fence body are clamped between the pair of clamping fittings. [Effects of the Invention]

[0012] The bottom of the protective fence of this invention can be adjusted to any height depending on the installation location by cutting the wire that makes up the mesh of the fence body. In addition, the fence body is fixed not only to the protective fence but also to the ground by the lower fixing device, so it can be firmly fixed in the gap between the bottom of the protective fence and the ground. [Brief explanation of the drawings]

[0013] [Figure 1] 1A is a front view of a protective fence lower intrusion prevention fence according to a first embodiment of the present invention, FIG. 1B is a side view, and FIG. 1C is a plan view. [Figure 2] 1A is a front view of a fence body used in the intrusion prevention fence, and FIG. 1B is a side view. [Figure 3] (a) is an enlarged view of area A in Figure 1(a), (b) is an enlarged view of area B in Figure 1(b), (c) is an enlarged view of area C in Figure 1(c), and (d) is an exploded plan view of (c). [Figure 4] (a) is a front view of a second embodiment of the protective fence lower intrusion prevention fence of the present invention, (b) is a side view, and (c) is a plan view. [Figure 5](a) is an enlarged view of area A in Figure 4(a), (b) is an enlarged view of area B in Figure 4(b), (c) is an enlarged view of area C in Figure 4(c), and (d) is an exploded plan view of (c). DETAILED DESCRIPTION OF THE INVENTION

[0014] A guardrail lower intrusion prevention fence according to a first embodiment of the present invention will be described with reference to Figures 1 to 3. As shown in Figures 1(a) to 1(c), the guardrail lower intrusion prevention fence (hereinafter referred to as the intrusion prevention fence 1) is installed in the gap between the bottom of the guardrail 10 and the ground G. Figure 1(a) is a view of the guardrail 10 equipped with the intrusion prevention fence 1, viewed from outside the site. In Figure 1(b), the left side is outside the site and the right side is inside the site, and in Figure 1(c), the upper side is inside the site and the lower side is inside the site.

[0015] The protective fence 10 is constructed by setting up posts 12 on foundations 11 constructed at regular intervals on the ground G, and erecting a mesh fence 13A between the posts 12. The mesh fence 13A of this embodiment has vertical wires 15a and horizontal wires 15b arranged in a lattice pattern within a rectangular frame member 14. All of the components that make up the protective fence 10 are used in existing protective fences.

[0016] The intrusion prevention fence 1 comprises a fence body 2 fixed to the lower part of the protective fence 10, an upper fixing device 3A for fixing the fence body 2 to the protective fence 10, and a lower fixing device 4 for fixing the fence body 2 to the ground G. It is desirable that the intrusion prevention fence 1 further comprises a sheet body 5 laid on the ground G.

[0017] As shown in Figures 2(a) and 2(b), the fence body 2 has a mesh section 22 made up of wires 21 (vertical wires 21a, horizontal wires 21b) arranged in a grid pattern, and furring strips 23 formed by bending the lower edges of the mesh section 22 in a three-dimensional manner. The fence body 2 is made by molding metal wires such as zinc, aluminum, or stainless steel into a predetermined shape and then coating them with an olefin-based resin such as polyethylene. In the illustration, the furring strips 23 have a circular vertical cross section, but are not limited to this and may be semicircular, triangular, or other polygonal shapes as long as they are mainly made by bending or curving the vertical wires 21a in a three-dimensional manner.

[0018] The fence body 2 can be made from a commercially available mesh fence (for example, Mesh Fence M0 (registered trademark) manufactured by Sekisui Jushi Corporation) that has been cut to the appropriate length. The width of the fence body 2 is preferably approximately the same as the width between the posts 12 (the width of the mesh fence 13A), but it is also possible to line up multiple fence bodies that are smaller than the width between the posts 12. The fence body 2 itself has sufficient surface strength, but the wire material 21 itself can be easily cut with tools such as nippers, so the height of the fence body 2 can be adjusted as desired at the construction site.

[0019] As shown in Figures 3(a) to 3(d), the upper fixing device 3A of this embodiment has a band-shaped pressing plate 31 and a screw member (drill screw 32) that fastens the pressing plate. The pressing plate 31 (see also Figure 1(a)) is a long plate material that is molded from a highly weather-resistant resin material or a metal material such as aluminum. The drill screw 32 is a general-purpose metal screw. The upper fixing device 3A fixes the fence element 2 to the protective fence 10 by screwing in the drill screw 32 while sandwiching the wire 21 at the upper edge of the fence element 2 between the lower part (frame-shaped member 14) of the protective fence 10 and the pressing plate 31 (see Figure 3(d) in particular).

[0020] The lower fixing device 4 includes a clamp 41 formed by bending a strip-shaped metal plate and a stake-like member 42 driven into the ground. The clamp 41 includes a U-shaped enclosure 43 and a pair of fixing pieces 44 provided at both ends of the enclosure 43 and in contact with the ground G. The enclosure 43 is inserted into the boundary between the furring strip 23 and the mesh portion 22. The enclosure 43 is molded so that its length in a plan view is greater than the planar dimensions of the furring strip 23 and its height in a side view is greater than the vertical dimensions of the furring strip 23 so as to surround the furring strip 23. The fixing piece 44 is a member that extends from the lower end of the enclosure 43 and bends outward horizontally, and has a hole 45 formed therein. The stake-like member 42 is a general-purpose bolt with a long shaft that is buried in the ground and is inserted into the ground G through the hole 45 provided in the fixing piece 44.

[0021] A weed control sheet with excellent weather resistance is preferably used for the sheet body 5. An example of this type of weed control sheet is a weed control sheet made of a nonwoven fabric using polyester or polypropylene fibers, with a highly light-reflective white sheet layered on top of a black base fabric with low light transmittance. As shown in FIG. 3(a), the sheet body 5 is fixed to the ground G together with fixing pieces 44 by stake-shaped members 42. The length of one sheet body 5 is set to be equal to the width of the fence body 2. The sheet body 5 is preferably laid within a range of, for example, 500 mm from directly below the intrusion prevention fence 1 to the outside of the site, but it may be more or less than 500 mm.

[0022] 1(c), the edges of the sheet body 5 on the outside and inside of the site are fixed to the ground G by laying a band-like pressure plate 51 on the sheet body 5 and inserting stake-like members 52 into the ground G from above. The pressure plate 51 may be the same as the pressure plate 31 of the upper fixing device 3A or a different one. The stake-like members 52 may also be the same as the stake-like members 42 of the lower fixing device 4.

[0023] With the intrusion prevention fence 1 of this embodiment, a commercially available mesh fence can be used for the fence body 2, and the height can be adjusted as needed depending on the installation location of the protective fence by cutting the wires 21 that make up the mesh section 21. Furthermore, the fence body 2 is fixed not only to the protective fence 10 but also to the ground G by the lower fixing device, so it can be firmly fixed in the gap between the bottom of the protective fence 10 and the ground G.

[0024] Furthermore, because the sheet body 5 is laid on the ground G below the intrusion prevention fence 1 and is fixed integrally with the lower fixing device 3A, it is possible to prevent wild boars and other animals from digging through the ground G and invading the premises. Furthermore, because the lower edge of the fence body 2 is provided with furring strips 23, the structural strength of the fence body 2 itself is increased compared to fences without furring strips 23 or protective netting. As a result, even large animals such as wild boars cannot easily destroy the intrusion prevention fence 1, making it possible to more effectively prevent animals from invading the premises.

[0025] Furthermore, in this embodiment, the upper fixing device 3A has a strip-shaped clamp 41, and the fence body 2 is clamped between this clamp 41 and the frame-shaped member 14 of the protective fence 10, so that even if the pitch width of the vertical wire material 21a of the fence body 2 does not match the pitch width of the vertical wires of the mesh fence 13A of the protective fence 10, the fence body 2 can be stably fixed to the protective fence 10.

[0026] A second embodiment of the intrusion prevention fence for the lower part of a protective fence according to the present invention will be described with reference to Figures 4 and 5. As shown in Figures 4(a) to 4(c), the second embodiment of the intrusion prevention fence for the lower part of a protective fence (hereinafter referred to as intrusion prevention fence 1) differs from the first embodiment in that the protective fence 10 has a modified upper fixing member 3B. In this embodiment, the mesh fence 13B of the protective fence 10 is the same as that used in the fence body 2. The structures of the fence body 2, lower fixing member 4, and sheet body 5 are the same as those in the first embodiment.

[0027] The upper fixing device 3B of this embodiment has a pair of clamping fittings 33a, 33b and bolt members (bolt 34a and nut 34b) that bolt the clamping fittings 33a, 33b together. The clamping fittings 33a, 33b are made of flat metal plates that are slightly longer than the pitch width of the vertical wire members 21a of the mesh section 22, with both ends bent and a hole 35 in the center for inserting the bolt 34a.

[0028] In this embodiment, the vertical wire 21a at the top end of the fence body 2 passes through a gap in the furring strip of the mesh fence 13B of the protective fence 10 and is positioned adjacent to the vertical wire 15a of the mesh fence 13B, and with the lower part of the protective fence 10 (mesh fence 13B) and the fence body 2 clamped between a pair of clamping fittings 33a, 33b, a bolt 34a and a nut 34b are screwed together. In this way, the fence body 2 is fixed to the lower part of the protective fence 10.

[0029] According to this embodiment, the mesh fence 13B of the protective fence 10 and the fence body 2 have the same pitch width, so the fence body 2 can be fixed with clamping fittings 33a, 33b that are smaller than the retaining plate 31 of the first embodiment. Furthermore, because the same material is used for the mesh fence 13B of the protective fence 10 and the fence body 2, the appearance can also be improved in terms of design.

[0030] The intrusion prevention fence 1 according to the present invention is not limited to the above-described embodiment and can be modified in various ways. For example, in all of the above-described embodiments, a configuration in which furring strips 23 are provided on the lower edge of the fence body 2 is shown, but the furring strips 23 may not be provided as long as the configuration allows the fence body 2 to be fixed to the ground G by the lower fixing device 4. Furthermore, if there are no furring strips 23, the clamping members 41 of the lower fixing device 4 may not have the enclosing portion 43. Furthermore, the configuration of the protective fence 10 shown in the above-described embodiment is merely an example, and the intrusion prevention fence 1 can be applied to any fence having a lattice structure. [Explanation of symbols]

[0031] 1. Lower part of protective fence to prevent intrusion 10 Protective fence 12 pillars 2 Fence body 21 Wire rod 22 Mesh section 23 Fuselage 3A, 3B Upper fixture 31 Retaining plate 32 Drill screw (screw component) 33a, 33b Clamping hardware 34a Bolt (bolt component) 34b Nut (bolt component) 4 Lower fixture 42 Pile-like member 43 Frame-shaped part 44 Fixed piece 45 Hole

Claims

1. A protective fence lower intrusion prevention fence installed in the gap between the lower part of the protective fence and the ground, The fence comprises a fence body fixed to the lower part of a protective fence erected on the ground via posts, an upper fixing device for fixing the fence body to the protective fence, and a lower fixing device for fixing the fence body to the ground, The fence body has a mesh portion formed by arranging wires in a grid pattern.

2. The fence body has a furring strip in which the lower edge of the mesh portion is bent three-dimensionally, The protective fence lower intrusion prevention fence described in claim 1, characterized in that the lower fixing device comprises a U-shaped enclosure portion that is inserted into the boundary between the furring strip and the mesh portion and surrounds the furring strip, a pair of fixing pieces that are provided at both ends of the enclosure portion and come into contact with the ground, and a stake-shaped member that is inserted into the ground through a hole provided in the fixing piece.

3. Further provided with a sheet body to be laid on the ground, 3. The protective fence according to claim 2, wherein the sheet body is fixed to the ground together with the fixing pieces by the stake-like members.

4. The upper fixing device has a band-shaped pressing plate and a screw member for screwing the pressing plate, A protective fence under intrusion prevention fence as described in claim 2 or claim 3, characterized in that the fence body is fixed to the protective fence by screwing in the screw member while the fence body is clamped between the lower part of the protective fence and the pressure plate.

5. The upper fixing device has a pair of clamping members and a bolt member that bolts the clamping members from the outside, A protective fence under intrusion prevention fence as described in claim 2 or claim 3, characterized in that the fence body is fixed to the protective fence by screwing in the bolt member while the lower part of the protective fence and the fence body are clamped by a pair of the clamping devices.

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