JP7441118B2 - Nest prevention device - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act 1. Release date: July 11, 12, 2020 2. Venue JR East Research Center 3. Publisher Yuzo Tsukabe, Toru Oyama, Yuta Shibuhama, Mitsuaki Chonan, Ichii Kanno 4. Contents of the disclosed invention A nesting device was disclosed.

The present invention relates to a nesting prevention device using a bird net, and more particularly to a nesting prevention device suitable for installation on a beam of a frame structure such as a beam of a contact line support structure of railway track equipment.

On railway tracks, nesting behavior has been reported in which birds such as crows build nests on the beams of overhead contact line support structures. Nests by birds are sometimes carried out using branches of plants such as ivy and vine, as well as metal objects such as metal hangers and wire, which are brought into the beam. The overhead wires suspended from the beams are bare wires with no insulation coating, so if metal wires are used for the nest material, they may sag and cause ground faults, leading to transportation problems. . Conventionally, therefore, a countermeasure has been taken to attach a roll-shaped bird net inside the beam.

However, in order to install a roll of bird netting, it is necessary to cut the netting material to match the dimensions of each side of the beam, or to install it one by one by working at heights using a ladder or a land rail vehicle with a lift. The problem was that it took a long time to do the work. Inventions related to nest prevention devices using bird nets include those disclosed in Patent Documents 1 and 2, for example.

Among these, the nest prevention device disclosed in Patent Document 1 has a triangular prism-shaped metal net installed inside a beam of a frame structure having a rectangular cross-section. Support bodies extending in the longitudinal direction of the beam are provided at three locations. Furthermore, the invention disclosed in Patent Document 2 supports the ends of the bird net by a support consisting of a pair of elongated plate members attached to the upper inner side of the beam of the frame structure along the direction in which the beam extends. It is designed to be sandwiched and suspended from the top of a beam to support it in an expanded state.

Patent No. 4668078 Japanese Patent Application Publication No. 2012-161197

However, although the nest prevention device of Patent Document 1 has good stability because the bird net is shaped like a triangular prism, the net is made of metal, which makes it heavy and difficult to handle, and it must be assembled in a triangular prism shape at a high place. It takes time to install because it requires a lot of work. In addition, the cross section of the beam is rectangular, whereas the cross section of the bird net is triangular, so there is a gap between the beam and the net, and there remains the risk that nests will nest in that gap. be.

On the other hand, the invention of Patent Document 2 uses a synthetic resin bird net, which is lightweight and easy to handle. This creates a gap between the beam and the net, and there is a risk that nests may be nested in that gap. Furthermore, since the structure is such that the bird net is suspended by supports, there is a problem in that it is not suitable for installation inside a vertical column of a contact line support structure.

The present invention has been made with attention to the above-mentioned problems, and its purpose is to provide a lightweight and easy-to-handle product, and to reduce the risk of nesting by making it difficult for gaps to form between the frame of the structure and the net. An object of the present invention is to provide a nesting prevention device that can lower the nesting rate.
Another object of the present invention is to provide a nest prevention device that can be easily installed not only on the beam portion of the overhead contact line support structure but also on the trapezoidal portions and vertical column portions at both ends of the beam.

In order to achieve the above object, this invention
In a nesting prevention device installed inside a building having an overall prismatic frame structure or truss structure to prevent nesting,
A plurality of synthetic resin nets having a predetermined mesh size are connected by a hinge so that they can be folded and expanded.

According to the nest prevention device having the above structure, it is lightweight because it is made of a synthetic resin net, and it is easy to handle because a plurality of nets are connected by a hinge so that they can be folded and expanded. .

Here, desirably, the hinge includes a plurality of wing members fixed to the edge of the net at predetermined intervals and each having a cylindrical portion, and a plurality of wing members fixed to the edge of the adjacent net. It consists of a core rod inserted across the shaft cylinder part,
The outer diameter of the core rod and the inner diameter of the cylindrical shaft portion are set to such a size that a frictional force capable of preventing rotation due to the weight of the net is obtained between the core rod and the cylindrical shaft portion. Configure it as follows.
Specifically, the outer diameter of the core rod may be set to be approximately the same diameter as the inner diameter of the shaft cylinder portion.

According to this configuration, when the net is expanded, the angle between the nets can be maintained by the frictional force between the axial cylinder part and the core rod that constitute the hinge, so that the angle between the frame of the structure and the net can be maintained. There will be fewer gaps between them, reducing the risk of nesting. Note that if the outer diameter of the core rod is slightly smaller than the inner diameter of the shaft cylinder, the hinge alone will not produce a very large frictional force, but the weight of the net will bend the entire core rod, causing the core rod and shaft to Looseness with the cylindrical portion is eliminated, and an appropriate frictional force can be obtained between the shaft cylindrical portion and the core rod. Moreover, when the outer diameter of the core rod is slightly larger than the inner diameter of the shaft cylinder part, a larger frictional force can be obtained. Therefore, it is desirable to design the outer diameter of the core rod and the inner diameter of the shaft cylinder part so as to provide an appropriate frictional force depending on the size (weight) of the net.

Furthermore, desirably, the core rod is a resin-coated iron wire or a resin-coated steel pipe.
According to this configuration, the frictional force between the shaft cylinder part and the core rod can be increased, the net can be stably maintained in an expanded state, and the gap between the frame of the structure and the net can be increased. Gaps are less likely to form.

Moreover, desirably, the wing member is made of synthetic resin.
According to this configuration, the weight can be reduced and handling can be made easier compared to the case where metal wing members are used.

Preferably, when installed inside a building and expanded, the mesh wires forming each net are tied to members forming the building at multiple locations using string-like members. Configure it as follows.
According to this configuration, it is possible to prevent the expanded net from collapsing inward, making it difficult to create a gap between the frame of the structure and the net, and further reducing the risk of nesting.

According to the nesting prevention device of the present invention, it is lightweight and easy to handle, and a gap is less likely to be formed between the frame of the structure and the net, so that the risk of nesting can be reduced. Further, it has the effect that it can be easily installed not only in the middle part of the beam of the overhead contact line support structure but also in the trapezoidal part or the vertical column part at both ends of the beam.

FIG. 2 is a perspective view showing the structure of a nest prevention net for a beam intermediate portion of a nest prevention device according to an embodiment of the present invention. It is a perspective view showing the composition of the nest prevention net for the trapezoidal part of both ends of the beam of the nest prevention device of an embodiment. An example of a beam suitable for installing the nest prevention device according to the embodiment is shown, in which (A) is a plan view and (B) is a front view. It shows the detailed structure of the nest prevention net of the nest prevention device according to the embodiment of FIG. 1, in which (A) is a plan view and (B) is a side view. Details of the hinges constituting the nest prevention device according to the embodiment are shown. (A) is a perspective view of one hinge, (B) is a plan view of three hinges, and (C) is a net opened 90 degrees. FIG. FIG. 2 is a perspective view showing a state in which the nest prevention device according to the embodiment is installed in a beam for supporting overhead contact lines.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a nest prevention device according to the present invention will be described in detail with reference to the drawings.
1 and 2 are perspective views showing the configuration of a nest prevention device according to an embodiment of the present invention, and FIG. 3 is a beam for supporting overhead contact lines as an example of a frame structure in which the nest prevention device of the embodiment is installed. 1 shows an example of the configuration, in which (A) is a plan view and (B) is a front view. As shown in FIG. 3, the beam 20 on which the nest prevention device of the embodiment is installed is made of angle steel with an L-shaped cross section (angle steel) or steel material with a U-shaped cross section (channel steel). It is a combined frame structure, with an intermediate portion 20A having a quadrangular column shape and trapezoidal portions 20B provided at both ends.

The nest prevention device 10 shown in FIG. 1 is installed in the middle part 20A of the beam 20 shown in FIG. 3, and consists of an upper net 11A, a pair of side nets 11B, and a lower net 11C. The nets are rotatably connected by a hinge 12, and are formed as a whole into a square prism. The upper net 11A, the side net 11B, and the lower net 11C each have a rectangular shape.

On the other hand, the nest prevention device 10 shown in FIG. 2 is installed inside the trapezoidal part 20B of the beam 20 shown in FIG. 3, and is composed of an upper net 11A, a pair of side nets 11B, and a lower net 11C. These nets are rotatably connected by a hinge 12 and are formed to have a rectangular shape when viewed from the side and a trapezoid when viewed from the front. The upper net 11A and the lower net 11C each have a rectangular shape, and the side net 11B has a trapezoidal shape in which the height H1 of one side is larger than the height H2 of the other side.

The upper net 11A, side net 11B, and lower net 11C have square eyes arranged in a matrix, and are made of flexible synthetic resin such as polyethylene or polypropylene. Furthermore, the synthetic resin constituting each net contains weathering agents such as ultraviolet absorbers and antioxidants. The mesh size of each net is set to a size of 20 mm to 60 mm depending on the type of bird whose nesting is to be prevented. For example, if the bird to be prevented from nesting is a large bird such as a crow, 60 mm is selected as the mesh distance.

By increasing the mesh size of each net, it is possible to reduce the weight when the size of the net is the same. When the size (area) and weight of each net are the same, the larger the mesh size, the thicker the wire diameter (thickness) and the higher the strength.
The width W of the upper net 11A and the heights H, H1, and H2 of the side net 11B are set to approximately match the inner dimensions of the beam 20 to be installed. Further, from the viewpoint of workability, it is desirable that the length L of each net 11A, 11B, 11C be 2 m or less, and the total weight be 10 kg or less.

Next, the structure of the hinge 12 that connects each of the nets 11A, 11B, and 11C will be explained using FIGS. 4 and 5. Note that FIG. 4(A) is a plan view of the nest prevention device 10 shown in FIG. 1, and FIG. 4(B) is a front view thereof.
As shown in an enlarged view in FIG. 5(A), each net 11A, 11B, 11C has a pair of mating parts 12a, 12b in the shape of a strip and a shaft having a cylindrical through hole at the edge of the long side of each net 11A, 11B, 11C. A wing member 12A having a cylindrical portion 12c is fixed by sandwiching and fusing the edges of each of the nets 11A, 11B, and 11C between the mating portions 12a and 12b.

A plurality of wing members 12A as described above are provided at predetermined intervals along the long side edges of each net 11A, 11B, 11C. Further, as shown in FIG. 5(B), the wing members 12A of adjacent nets are provided in a staggered relationship with the wing members 12A of the edge of the other net for connection. By inserting a resin-coated iron wire or a resin-coated steel pipe as a core rod 12B into the shaft cylinder portion 12c, a hinge is configured to rotatably connect the nets to each other. The material of the wing member 12A is preferably the same synthetic resin as the material of the nets 11A, 11B, and 11C, but may be made of metal. Furthermore, in either case, the mating portions 12a and 12b can be connected using bolts and nuts or rivets.

Furthermore, in the nest prevention device of this embodiment, the diameter of the core rod 12B is set to be the same diameter as the inner diameter of the shaft cylinder portion 12c of the wing member 12A. Even if they have the same diameter, the weight of the net causes the entire core rod to curve, eliminating any looseness between the core rod and the shaft cylinder. Further, both the core rod 12B and the shaft cylinder portion 12c are made of resin with high friction. Therefore, an appropriate frictional force is generated between the shaft cylinder part 12c and the core rod 12B inserted therein, and as shown in FIG. The angle between the nets can also be maintained. Therefore, when the net is installed in the beam shown in FIG. 3, for example, a gap is less likely to be formed between the beam frame and the net, and the risk of nesting can be reduced.

Next, the handling and installation method of the nest prevention device of this embodiment will be explained.
When the nest prevention device (nest prevention net) of this embodiment is installed in a beam of a frame structure as shown in FIG. 3, the whole device is first folded and made flat, and then rolled up like a kelp roll. Next, use a ladder or the like to carry the nest prevention net up to the beam height and insert it into the beam through the gap in the frame. Next, while deploying the anti-rust net within the beam, the nets are expanded so that the angle between each net is 90 degrees, as shown in FIG. At this time, the surface of the nest prevention net, which has expanded into a quadrangular prism shape, is in a state where it is partially in contact with the frame of the beam.

Thereafter, as shown in Fig. 6, the wires of the nest prevention net are tied to the beam frame (angle material or channel steel) at appropriate intervals using a plurality of cable ties 13 to complete the installation. . If the length of the middle part of the beam is longer than 2 m, a plurality of nest prevention nets are inserted and installed within the beam. In addition, trapezoidal anti-fouling nets shown in FIG. 2 are inserted and installed in the trapezoidal portions at both ends of the beam.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, it has been explained that a resin-coated iron wire or a resin-coated steel pipe is used as the core rod 12B of the hinge 12 that connects the nets, but the core rod 12B has a diameter that is the same as the inner diameter of the shaft cylinder portion 12c, or Iron wires or steel pipes that are not coated with resin may be used as long as they are slightly larger. Further, the core rod 12B may be a round rod or round tube made entirely of resin. In this case, the diameter of the core rod 12B may be slightly smaller than the inner diameter of the shaft cylindrical portion 12c because the resin contacts with the shaft cylindrical portion 12c with high friction.

Furthermore, in the above embodiment, a nest prevention device is described in which four nets are connected to each other so as to be expandable into a rectangular prism shape, but the number of nets is not limited to four, and five or more nets are connected. A nest prevention device may also be configured. Moreover, although both ends of the nest prevention device of the above embodiment are open, a net may be provided to close the openings at both ends or one opening.
Furthermore, in the embodiment described above, the case where the nest prevention device of the present invention is applied to a contact line support structure of railway track equipment has been described. It can be used as a prevention device.

10 Nest prevention device (nest prevention net)
11A Upper net 11B Side net 11C Lower net 12 Hinge 12A Wing member 12B Core rod 12a, 12b Joining portion 12c Shaft tube portion 13 Binding band 20 Beam

Claims (5)

A nesting prevention device installed inside a building having an overall prismatic frame structure or truss structure to prevent nesting,
A nest prevention device characterized in that a plurality of synthetic resin nets having a predetermined mesh size are connected by a hinge so that they can be folded and expanded. The hinge includes a plurality of wing members fixed to the edge of the net at predetermined intervals and each having a shaft cylindrical portion, and straddling the shaft cylindrical portions of the wing members fixed to the edge of the adjacent net. Consists of a core rod inserted through the
The outer diameter of the core rod and the inner diameter of the cylindrical shaft portion are set to a size such that a frictional force capable of preventing rotation due to the weight of the net is obtained between the core rod and the cylindrical shaft portion. The nest prevention device according to claim 1, characterized in that: The nest prevention device according to claim 2, wherein the core rod is a resin-coated iron wire or a resin-coated steel pipe. The nest prevention device according to claim 2 or 3, wherein the wing member is made of synthetic resin. When installed inside a building and expanded, the mesh wires forming each net are tied to members forming the building at multiple locations using string-like members. The nest prevention device according to any one of claims 1 to 4.

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