Sidewall lightning protection structure

Abstract

The objective is to provide a side wall lightning protection structure that can protect the side walls of a building from lightning strikes without compromising the building's aesthetic appearance. [Solution] A side wall lightning protection structure 10 provided on a building 1, comprising a metal part (handrail) 23b, a railing 20 provided on a balcony 4 of the building 1, and a conductive part 30 electrically connected to the metal part 23b and grounding the metal part 23b, wherein at least a part of the metal part 23b protrudes outward from the side wall part 5 of the building 1 and forms a lightning receiving part 40.

Description

Technical Field

[0007] ,

[0001] The present invention relates to a side wall lightning protection structure provided in a building.

Background Art

[0002] For example, in high-rise buildings with a predetermined height or more used as apartment houses, hotels, etc., a side wall lightning protection structure for protecting the side wall portion of the building from lightning strikes is required under the Building Standards Law.

[0003] Conventionally, as such a side wall lightning protection structure, a configuration in which a large number of lightning rods protruding outward from the outer wall of the building are provided and these lightning rods are grounded to the ground by a conductive part such as a guy wire is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above conventional side wall lightning protection structure, since a large number of lightning rods are provided on the side wall portion of the building, there is a problem that the aesthetic appearance of the building is deteriorated.

[0006] The present invention has been made in view of such problems, and an object thereof is to provide a side wall lightning protection structure capable of protecting the side wall portion of a building from lightning strikes without impairing the aesthetic appearance of the building.

Means for Solving the Problems

[0007] [[ID=?]] The present invention relates to a side wall lightning protection structure provided on a building, comprising a metal portion, a railing provided on the balcony of the building, and a conductive portion electrically connected to the metal portion and grounding the metal portion, wherein at least a portion of the metal portion protrudes outward from the side wall portion of the building and serves as a lightning receiving portion.

[0008] In the side wall lightning protection structure of the present invention, it is preferable that the fence body has a handrail that constitutes the metal portion, and a part of the handrail protrudes outward from the side wall portion of the building to form the lightning receiving portion. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a side wall lightning protection structure that can protect the side wall portion of a building from lightning strikes without impairing the aesthetic appearance of the building. [Brief explanation of the drawing]

[0010] [Figure 1] This is a front view of a building equipped with a side wall lightning protection structure according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view of the part of the building shown in Figure 1 where a balcony is provided. [Figure 3] This is a close-up cross-sectional view showing the portion of the balcony railing shown in Figure 2. [Figure 4] This is a cross-sectional view along line AA in Figure 3. [Modes for carrying out the invention]

[0011] The following describes in detail an embodiment of a side wall lightning protection structure, with reference to the drawings.

[0012] The building 1 shown in Figure 1 is equipped with a side wall lightning protection structure 10 according to one embodiment of the present invention. This building 1 is a reinforced concrete high-rise building. This building 1 is used as an apartment building and has a common area 2 on the lower floors and a multi-story residential unit area 3 located above the common area 2. Each residential unit on each floor of the residential unit area 3 is provided with a balcony 4. For convenience, in Figure 1, only one balcony 4 is labeled with a reference numeral.

[0013] The side wall lightning protection structure 10 according to this embodiment is for protecting the side wall portion of building 1 from lightning strikes. As shown in Figure 2, the side wall lightning protection structure 10 has a plurality of fence bodies 20 provided on each balcony 4 of building 1, and a plurality of conductive parts 30 corresponding to each of these fence bodies 20.

[0014] Since the configuration of the railing 20 and the corresponding conductive part 30 provided on the balcony 4 of each floor is basically the same, the following will describe the configuration of one railing 20 and one corresponding conductive part 30 provided on the balcony 4 of a certain floor.

[0015] The railing 20 is provided along the outer side of the balcony 4 of the building 1 to prevent falls from the balcony 4. As shown in Figures 3 and 4, in this embodiment, the railing 20 has a pair of support posts 21 and a railing body 23 fixed between the corresponding pair of support posts 21 using brackets 22.

[0016] A base portion 4a is provided on the outer side of the reinforced concrete balcony 4 of the building 1, and a pair of support columns 21 are supported by the balcony 4 with their lower ends embedded in the base portion 4a. The side of the base portion 4a of the balcony 4 that faces outward from the building 1 constitutes the side wall portion 5 of the building 1, that is, the outermost part of the reinforced concrete structure that makes up the building 1. The pair of support columns 21 are each positioned inward from the side wall portion 5 of the building 1.

[0017] The fence main body 23 is a rectangular frame body having a pair of vertical frame portions 23a arranged adjacent to the corresponding support columns 21 in parallel with the support columns 21, a handrail 23b bridged over the upper ends of the pair of vertical frame portions 23a, and a lower frame portion 23c bridged over the lower ends of the pair of vertical frame portions 23a. A rectangular glass 23d is fitted inside the fence main body 23. The fence main body 23 is arranged offset to the outer side of the building 1 with respect to the pair of support columns 21.

[0018] Note that the fence main body 23 is not limited to the configuration in which the glass 23d is fitted inside it. Instead of the glass 23d, a configuration in which a plurality of bars are fixed in a lattice pattern, or a configuration in which a plate-like member made of another material is fitted in place of the glass 23d, etc., as long as it functions as a fence, other configurations may also be used.

[0019] The pair of support columns 21, brackets 22, vertical frame portions 23a, handrail 23b, and lower frame portion 23c are each made of steel, that is, metal. That is, the fence body 20 includes the pair of support columns 21, brackets 22, vertical frame portions 23a, handrail 23b, and lower frame portion 23c as its metal parts.

[0020] Note that the pair of support columns 21, brackets 22, vertical frame portions 23a, handrail 23b, and lower frame portion 23c are not limited to being made of steel. As long as they can conduct lightning current, they may be made of other metals.

[0021] As shown in FIG. 3, the pair of support columns 21, vertical frame portions 23a, and lower frame portion 23c that form part of the metal parts of the fence body 20 are each arranged inside the building 1 rather than on the side wall portion 5 of the building 1.

[0022] On the other hand, a handrail 23b that forms part of the metal portion of the fence body 20 has a part on the outer side of the building 1 protruding outward beyond the side wall portion 5 of the building 1. And the part of the handrail 23b protruding outward beyond the side wall portion 5 serves as the lightning receiving part 40 of the side wall lightning protection structure 10. That is, the part of the handrail 23b protruding outward beyond the side wall portion 5 serves as the lightning receiving part 40 that receives lightning strikes directed toward the side wall portion 5 of the building 1. In this embodiment, the protruding amount of the lightning receiving part 40 outward from the side wall portion 5 is 10 mm.

[0023] In this embodiment, the protruding amount of the lightning receiving part 40 protruding outward from the side wall portion 5 is set to 10 mm. However, it is not limited to this. Considering the distance between the handrails 23b (lightning receiving parts 40) provided on the balconies 4 adjacent to each other vertically and horizontally, and the application of methods such as the rotating sphere method and the mesh method in various standards such as "JIS Z9290-3:2019", it can be set to an appropriate protruding amount that can effectively protect the building 1 from lightning strikes on the side wall portion 5.

[0024] Also, in this embodiment, the handrail 23b is configured such that a part on the outer side of the building 1 protrudes outward beyond the side wall portion 5 of the building 1 in the entire range from one end on the side of one support column 21 to the other end on the side of the other support column 21. However, it may be configured such that only a part between one end and the other end protrudes outward beyond the side wall portion 5 of the building 1.

[0025] Furthermore, in this embodiment, a part of the handrail 23b that forms part of the metal portion of the fence body 20 is protruded outward beyond the side wall portion 5 of the building 1 to serve as the lightning receiving part 40. However, it is not limited to this. For example, as shown by the two-dot chain line in FIG. 3, a part of the lower frame portion 23c of the fence main body portion 23 of the fence body 20 is protruded outward beyond the side wall portion 5 of the building 1, and the part of the lower frame portion 23c protruding outward beyond the side wall portion 5 is used as the lightning receiving part 40, or both the part of the handrail 23b protruding outward beyond the side wall portion 5 and the part of the lower frame portion 23c protruding outward beyond the side wall portion 5 are used as the lightning receiving part 40. As long as the part constituting the lightning receiving part 40 is at least a part of the metal portion constituting the fence body 20, it can be various parts.

[0026] The conductive part 30 is electrically connected to the handrail 23b, which constitutes the metal part of the fence body 20, i.e., the lightning receiving part 40, and grounds the lightning receiving part 40 to the ground 6. As shown in Figure 2, in this embodiment, the conductive part 30 is embedded inside the balcony 4, column 7 and floor slab 8 of the reinforced concrete building 1, and has a conductive wire 31 that electrically connects the main reinforcement bars 7a arranged in the column 7 to the support column 21. In addition, the support column 21 to which the conductive wire 31 is electrically connected and the bracket 22 that fixes the support column 21 to the handrail 23b each constitute part of the conductive part 30 and electrically connect the lightning receiving part 40 to the conductive wire 31. Furthermore, the main reinforcement bars 7a of the column 7 extend to the ground 6 and constitute part of the conductive part 30, grounding the conductive wire 31 to the ground 6. Note that multiple main reinforcement bars 7a are arranged inside the column 7, and these main reinforcement bars 7a are electrically connected to each other by conductive wires 32. The conductive part 30 having the above configuration can channel the lightning current of the lightning strike received by the lightning receiving part 40 through the bracket 22, support column 21, conductive wire 31, and main reinforcement 7a into the ground 6, i.e., the earth.

[0027] Furthermore, the conductive part 30 is not limited to the above configuration. It may be any other component or configuration that is electrically connected to the handrail 23b (metal part) constituting the lightning receiving part 40 and can ground the lightning receiving part 40 to the ground 6. For example, it may be a twisted wire with one end electrically connected to the support column 21 and the other end grounded to the ground 6. In addition, the conductive part 30 may be configured to be grounded to the ground 6 from the handrail 23b constituting the lightning receiving part 40, passing through a location other than the column 7.

[0028] In the side wall lightning protection structure 10 having the above configuration, lightning strikes directed toward the side wall portion 5 of the building 1 are received by the lightning receiving section 40, which is made up of a part of the handrail 23b that protrudes outward from the side wall portion 5 of the building 1, and the lightning current of the lightning received by the lightning receiving section 40 can be transmitted to the ground 6, i.e., the earth, through the conductive part 30, i.e., the bracket 22, the support column 21, the conductive wire 31 and the main reinforcement 7a. This protects the side wall portion 5 of the building 1 from lightning.

[0029] Thus, in the side wall lightning protection structure 10 according to this embodiment, a portion of the handrail 23b, which constitutes a part of the metal portion of the fence body 20, is made to protrude outward from the side wall portion 5 of the building 1, and the portion of the handrail 23b that protrudes outward from the side wall portion 5 is made into a lightning receiving portion 40, and the lightning receiving portion 40 is grounded by the conductive portion 30, so that the side wall portion 5 of the building 1 can be protected from lightning strikes.

[0030] Furthermore, in the side wall lightning protection structure 10 according to this embodiment, instead of providing multiple lightning rods as lightning receiving parts on the side wall portion 5 of the building 1, a part of the metal portion of the fence body 20 is made to protrude outward from the side wall portion 5 of the building 1, and this protruding portion is made to act as a lightning receiving part 40. Thus, the side wall portion 5 of the building 1 can be protected from lightning strikes without impairing the aesthetic appearance of the building 1.

[0031] In particular, in the side wall lightning protection structure 10 according to this embodiment, the fence body 20 is configured to have a handrail 23b that constitutes a metal part, and a lightning receiving part 40 is provided by making a part of the handrail 23b protrude outward from the side wall portion 5 of the building 1. This makes it possible to protect the side wall portion 5 of the building 1 from lightning strikes without further impairing the aesthetic appearance of the building 1.

[0032] The present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the invention.

[0033] For example, in the above embodiment, the fence body 20 is configured to have a pair of support posts 21 and a fence body portion 23 fixed to the support posts 21 so as to be offset from the pair of support posts 21 toward the outside of the building 1. However, it is not limited to this configuration, and other shapes or configurations are possible as long as it has metal parts and is installed on the balcony 4 of the building 1.

[0034] Furthermore, the building 1 to which the side wall lightning protection structure 10 according to this embodiment is provided is not limited to apartment buildings, but may be a building used for other purposes as long as it has a balcony 4. [Explanation of Symbols]

[0035] 1. Building 2 Common areas 3. Dwelling Units 4 Balcony 5 Side wall part 6 ground 7 pillars 7a Main reinforcement 8 Floor slab 10 Side wall lightning protection structure 20 Fence body 21 Post 22 brackets 23 Fence main body 23a Vertical frame section 23b Handrail (metal part) 23c Lower frame part 23d glass 30 Conductive part 31 Conductive wire 40 Lightning receiver

Claims

1. A lightning protection structure for side walls installed in a building, A railing body provided on the balcony of the building, comprising a metal part, It has a conductive part that is electrically connected to the metal part and grounds the metal part, A side wall lightning protection structure characterized in that at least a portion of the metal part protrudes outward from the side wall portion of the building and serves as a lightning receiving part.

2. The fence body has a handrail which constitutes the metal part, The side wall lightning protection structure according to claim 1, wherein a portion of the handrail protrudes outward from the side wall portion of the building and serves as the lightning receiving portion.

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