JP4121482B2 - Sidewall lightning protection mechanism in buildings - Google Patents

Description

  The present invention relates to a side wall lightning protection mechanism in a building.

  There is JIS A4201: 1992 (lightning protection equipment for buildings, etc.) as a conventional standard for lightning protection equipment for buildings, etc., and this standard does not stipulate protection against side wall lightning. It was revised on the 8th in accordance with IEC61024-1 (Lightning protection for buildings), and revised JIS A4201: 2003 provides protection against side wall lightning. On the other hand, lightning protection equipment according to the Building Standards Law is required to be installed by JIS, but at present, installation by JIS A4201: 1992 is permitted according to the notification of the former Ministry of Construction.

  Since JIS A4201: 1992 does not stipulate protection against side wall lightning, at present, many high-rise buildings exceeding 60m (20m at the highest protection level) do not have side wall lightning protection. However, in a building where the conductor is not exposed on the surface, such as a tiled PC board, damages such as a part of the side wall portion being destroyed and falling due to a lightning strike on the side wall have occurred.

  In order to prevent the occurrence of such damage due to side wall lightning, if JIS A4201: 2003 is applied in the future, the side wall surface will be protected from lightning strikes for buildings exceeding 60m (20m at the highest protection level). Therefore, it is necessary to provide a protection mechanism for promptly flowing a lightning current to the ground when a lightning strike is applied to the side wall.

  On the other hand, as conventional examples of lightning protection equipment in buildings, there are those described in Patent Documents 1 to 4, for example. Patent Documents 1 to 3 disclose a protection mechanism configured to install a lightning conductor on a roof of a building over a predetermined length, and do not mention protection from side wall lightning. On the other hand, Patent Document 4 discloses a mechanism for protecting the side wall portion from side wall lightning, and this protection mechanism is the same as the surface of the surface layer plate on the side surface of the surface layer plate attached to the side wall of the building. A vertical lightning conductor is fixed so that it becomes a surface, and the vertical lightning conductor and an anchor bolt for fixing the surface layer plate to the outer wall are electrically connected by a grounding conductor, and the surface layer plate for a high-rise part of a high-rise building Attach this surface layer plate to the outer wall of the high-rise building with anchor bolts, and connect the end of the grounding conductor that is electrically connected to the reinforcing bars or steel frames of the building in advance to the anchor bolts. Is configured.

JP-A-5-161239 JP 7-264759 A JP-A-10-219938 JP 2001-86631 A

  When constructing a protection mechanism for side wall lightning according to JIS A4201: 2003, for example, at the highest level of protection, a metal mesh must be configured on the side wall with a 5 m pitch or grid. However, it is inevitable to influence the aesthetics of the facade of the building. Therefore, there is a strong demand for a side-wall lightning protection mechanism that does not impair the aesthetics.

  In addition, when installing a lightning conductor on the side wall of a building, of course, it is important how to ground it to the earth. For example, for the purpose of protection against side lightning In the above-mentioned Patent Document 4, as described above, after attaching the surface layer plate fixing the vertical lightning conductor to the outer wall of the high-rise building with the anchor bolt, it is electrically connected to the reinforcing bar or steel frame of the building. The operation | work which connects the edge part of the conducting wire for grounding to an anchor bolt is needed. The connection work between the lightning conductor and the grounding conductor is the same as in other Patent Documents 1 to 3.

  Conventionally, after performing the operation of fixing the side wall portion to the housing in this way, it is necessary to perform the operation of grounding the lightning-receiving portion conductor.

  Therefore, in order to solve such a problem, the applicant has previously proposed a side wall lightning protection mechanism in a building as shown in FIGS. (Japanese Patent Application No. 2003-423727)

  In other words, the side wall lightning protection mechanism includes a lightning-receiving conductor 2 on the outer surface side of the outer wall unit 1 in a building that forms the outer wall by fixing the mounting bracket 3 of the outer wall unit 1 to a steel frame member (not shown). And the mounting bracket 3 are connected to each other by a connecting conductor 4 that passes through the inside of the outer wall unit 1. With this configuration, a lightning-receiving conductor on the outer surface side of the outer wall unit 1 is provided. 2 is grounded through the connecting conductor 4, the mounting bracket 3, and the steel frame member.

  The lightning-receiving portion conductor 2 can have a linear configuration as shown in FIGS. 6 and 7 or a dot configuration as shown in FIG.

In the side wall lightning protection mechanism described above, the outer wall finishing member 5 such as a tile attached to the outer surface side of the outer wall unit 1 by adhesion or the like, or the waterproof seal 6 provided at the joint between the outer wall units 1 as shown in FIG. when located in the vicinity of the lightning section conductor 2, due to stream-mer generated from rapid temperature rise and lightning receptor conductor when lightning strikes to the lightning receptor conductor 2, the outer wall finishing member 5 There are cases in which inconveniences such as deformation, discoloration, destruction, burning of the waterproof seal 6 and generation of wrinkles and contamination of the outer wall finishing member 5 may occur.

  The object of the present invention is to provide a side wall lightning protection mechanism that can effectively prevent the occurrence of such inconveniences.

  In order to solve the above-described problem, in the present invention, in a side lightning protection mechanism in which a lightning conductor is installed on an outer wall of a building and the lightning conductor is connected to a conductive housing member. Then, it is proposed to dispose a conductive protection plate between the lightning conductor and the outer wall finishing member.

  According to the present invention, in the above configuration, it is proposed that the lightning conductor is configured in a linear shape, and a strip-shaped conductive protection plate is disposed on both sides thereof.

  Further, in the present invention, in the above configuration, it is proposed that the lightning conductor is configured in a dot shape, and a conductive protection plate is disposed around the conductor.

  It is proposed that the conductive protection plate has a smooth surface.

In the present invention, when a lightning strikes on the lightning conductor, a conductive protection plate exists in the vicinity of the lightning conductor, so that a rapid temperature rise due to lightning current or a stream generated from the lightning conductor. mer, is relaxed by the conductive protection plate, thus it is possible to prevent discoloration of the outer wall finishing member spaced apart by a conductive protective plate from the lightning receptor conductor dropouts etc. associated with deformation and destruction or deterioration of the adhesive strength At the same time, it is possible to prevent the waterproof seal from burning and to prevent the occurrence of dirt due to the generated wrinkles.

  If the surface of the conductive protection plate is formed smoothly, even if the waterproof seal burns and generates soot at the time of a lightning strike, and it adheres to the conductive protection plate, it can be easily wiped off.

Next, embodiments of the side wall lightning protection outer wall unit and the side wall lightning protection mechanism of the present invention will be described with reference to the accompanying drawings.
First, FIG. 1 and FIG. 2 show the first embodiment of the main part constituting the side wall lightning protection mechanism of the present invention, FIG. 1 (b) is a front view of the outer wall of the building as seen from the outer surface side, (A) is the sectional view on the AA line of (b), FIG. 2 is a perspective view of the main elements. In these drawings, elements corresponding to the elements in FIGS. 6 to 8 described above are denoted by the same reference numerals.
In other words, reference numeral 1 denotes an outer wall unit 1, and a lightning striker conductor 2 is linearly provided on the outer surface side of the outer wall unit 1. The connecting conductor 4 is connected to the mounting bracket 3 of the outer wall unit 1.

  And the outer wall finishing member 5 such as tiles is attached to the outer wall unit 1 by bonding or the like as in the configuration of FIG. 7, but the outer wall finishing member 5 is different from the configuration of FIG. The conductive protection plate 7 (7a, 7b) is disposed between the lightning receiving portion conductor 2 and the outer wall finishing member 5 without being attached in the vicinity of 2. Further, a waterproof seal 6 is provided at the joint between adjacent outer wall units 1 as in the configuration of FIG.

  The conductive protection plate 7 is made of a metal plate such as aluminum or stainless steel, and has a smooth surface. In this case, the conductive protection plate 7 b adjacent to the lightning conductor 2 can be formed integrally with the lightning conductor 2.

Next, FIGS. 3 and 4 show a second embodiment of the main part constituting the side wall lightning protection mechanism of the present invention. FIG. 3B is a front view of the outer wall of the building as seen from the outer surface side. (A) is the sectional view on the AA line of (b), FIG. 2 is a perspective view of the main elements. In these drawings, elements corresponding to the elements in FIGS. 6 to 8 described above are denoted by the same reference numerals.
That is, reference numeral 1 denotes an outer wall unit 1, and a lightning striker conductor 2 is provided in a dot shape on the outer surface side of the outer wall unit 1. The connecting conductor 4 is connected to the mounting bracket 3 of the outer wall unit 1.

  And the outer wall finishing member 5 such as tiles is attached to the outer wall unit 1 by bonding or the like as in the configuration of FIG. 7, but the outer wall finishing member 5 is different from the configuration of FIG. The conductive protection plate 7c is arranged and separated between the lightning-receiving portion conductor 2 and the outer wall finishing member 5 without being attached in the vicinity of 2. The conductive protection plate 7c is made of a metal plate such as aluminum or stainless steel in the same manner as described above, has a smooth surface, and is formed integrally with the lightning receiving portion conductor 2.

  Next, FIG. 5 shows a third embodiment of the main part constituting the side wall lightning protection mechanism of the present invention. In this embodiment, the lightning receiving conductor 2 is provided at the corner of the concrete wall 8 of the building. The lightning-receiving conductor 2 protrudes from an L-shaped conductive protective plate 7d and is connected to the connecting part 9 provided on the inner surface side of the concrete wall 8. Is connected. The connecting portion 9 is configured to be grounded by connecting a grounding lead wire (not shown) to a frame member (not shown) such as a main reinforcing bar constituting the nearest column or beam, for example. Also in this embodiment, the outer wall finishing member 5 is not attached in the vicinity of the lightning-receiving conductor 2, unlike the configuration of FIG. 7, and the conductive protection is provided between the lightning-receiving conductor 2 and the outer wall finishing member 5. Plate 7d is arranged and separated.

  In the configurations of the first to third embodiments described above, when a lightning strike is applied to the lightning receiving conductor 2, the lightning current flows from the lightning receiving conductor 2 through the connecting conductor 4 to the mounting bracket 3 or the connecting portion 9. From these, it is possible to flow through the conductive casing member of the building and flow to the ground by the ground contact portion.

  At this time, since the conductive protection plate 7 is disposed around the lightning receiving portion conductor 2 and is separated from the outer wall finishing member 5, the rapid temperature rise due to the lightning current is mitigated, and therefore the conductive protection plate. 7 can prevent the outer wall finishing member 5 adjacent to 7 from being deformed, discolored, broken or broken, or dropped due to deterioration of adhesive strength. Furthermore, the conductive protection plate 7 can prevent the waterproof seal 6 at the joint from burning by mitigating the rapid temperature rise caused by the lightning current.

  Further, even if the waterproof seal 6 burns and generates soot and adheres to the surface of the conductive protection plate 7, it can be easily wiped off if the surface of the conductive protection plate 7 is formed smoothly. .

  The separation distance between the lightning conductor 2 and the outer wall finishing member 5 by the conductive protection plate 7 and the projection distance of the lightning conductor 2 from the surface of the conductive protection plate 7 are appropriately set by experiments or the like. For example, as an example, the lightning-receiving portion conductor 2 projecting distance from the surface of the conductive protection plate 7 is 30 mm or more, and the lightning-receiving portion conductor 2 and the outer wall finish by the conductive protection plate 7 If the separation distance from the member 5 is set to 45 mm or more, a sufficient protective function can be exhibited. The protruding distance of the lightning conductor 2 from the surface of the conductive protection plate 7 and the separation distance between the lightning conductor 2 and the outer wall finishing member 5 by the conductive protection plate 7 are in an inversely proportional relationship. Yes, the larger the protrusion distance, the smaller the separation distance.

  Next, Table 1 shows the results of measuring the protective function of the outer wall finishing member 5 by the conductive protective plate 7. That is, Table 1 shows the result of an adhesion strength test that is a measure of the adhesive strength of the ceramic tile that is the outer wall finishing member 5.

According to Table 1, the adhesion stress, which is a measure of the adhesive strength of the tile, is 1.96 (N / mm2) in a healthy state, whereas the lightning conductor is shown in FIGS. For tiles in the immediate vicinity of, it will drop to 0.28 (N / mm2). JASS-19
The necessary adhesion stress specified in the explanation of ceramic tile construction is 0.4 (N / mm2), so it can be seen that the value of the tile closest to the lightning conductor is far below that value.

  On the other hand, according to Table 1, the adhesion stress of the tile located 45mm away from the lightning conductor is 1.20 (N / mm2) by the conductive protection plate, and the tile attached 90mm away from the lightning conductor. Although the stress is 1.40 (N / mm2), it can be seen that although the adhesion stress is lower than that of the tile at the healthy site as described above, all of them greatly exceed the above required adhesion stress.

  In addition, the decrease in the adhesion stress of the tile at a position 90 mm away from the lightning conductor is smaller than the decrease in the adhesion stress of the tile at a position 45 mm apart. However, the larger the separation distance, the smaller the adhesion stress. Since the influence on the facade of the building becomes large, this separation distance may be determined as appropriate according to the trade-off of these conditions. As described above, the protruding distance of the lightning conductor 2 from the surface of the conductive protection plate 7 and the separation distance between the lightning conductor 2 and the outer wall finishing member 5 by the conductive protection plate 7 are: The relationship is inversely proportional, and the separation distance decreases as the protrusion distance increases.

  As described above, the present invention is revised as described above by installing a lightning conductor on the outer wall of a building and connecting the lightning conductor to a conductive housing member to form a side lightning protection mechanism. It is possible to protect against side wall lightning specified in JIS A4201-2003, and adapt it even if the lightning protection equipment according to the Building Standards Act is to be installed by this revised JIS and will be revised in the future. be able to.

  In particular, the present invention has the following advantages by disposing and separating the conductive protection plate between the lightning conductor and the outer wall finishing member.

  1. When lightning strikes the lightning conductor, there is a conductive protection plate in the vicinity of the lightning conductor, so a sudden temperature rise due to lightning current is mitigated by this conductive protection plate, and therefore the conductivity It can prevent discoloration, deformation and destruction of the outer wall finishing member separated from the lightning conductor by the protective plate, dropout due to deterioration of adhesive strength, etc. Can be prevented.

  2. If the surface of the conductive protection plate is formed smoothly, even if the waterproof seal burns and generates soot at the time of a lightning strike, and it adheres to the conductive protection plate, it can be easily wiped off.

  In addition, the present invention can be applied to a reinforced concrete structure in which the outer wall is constructed on the concrete site, in addition to being applied to a building constituting the outer wall by fixing the mounting bracket of the outer wall unit to the steel frame member. is there.

The 1st Example of the principal part which comprises the side wall lightning protection mechanism of this invention is shown, (a) is the sectional view on the AA line of (b), (b) is the principal of the building seen from the outer surface side. Part. FIG. 2 is a perspective view of main elements of FIG. 1. The 2nd Example of the principal part which comprises the side wall lightning protection mechanism of this invention is shown, (a) is BB sectional drawing of (b), (b) is the principal of the building seen from the outer surface side. Part. FIG. 4 is a perspective view of the main elements of FIG. 3. The 3rd Example of the principal part which comprises the side wall lightning protection mechanism of this invention is shown. It is a perspective view which shows the external appearance of the building which applies the side wall lightning protection mechanism of this invention. It shows an example of a side wall lightning protection mechanism when the present invention is not applied, (a) is a cross-sectional view taken along the line CC of (b), and (b) shows the main part of the building as seen from the outer surface side. is there. It shows an example of a side wall lightning protection mechanism when the present invention is not applied, (a) is a sectional view taken along the line DD of (b), and (b) shows a main part of the building as viewed from the outer surface side. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exterior wall unit 2 Lightning-receiving part conductor 3 Mounting bracket 4 Connection conductor 5 Outer wall finishing member 6 Waterproof seal 7 (7a, 7b, 7c, 7d) Conductive protection plate 8 Concrete wall 9 Connection part

Claims (4)

In the lightning protection mechanism on the side wall where a lightning conductor is installed on the outer wall of a building and this lightning conductor is connected to a conductive housing member, between the lightning conductor and the outer wall finishing member. Sidewall lightning protection mechanism in buildings, characterized in that a conductive protection plate is placed at a distance from each other 2. The side wall lightning protection mechanism in a building according to claim 1, wherein the lightning-receiving portion conductor is formed in a linear shape, and band-shaped conductive protection plates are arranged on both sides thereof. The side lightning protection mechanism in a building according to claim 1, wherein the lightning conductor is configured in a dot shape, and a conductive protection plate is arranged around the conductor. The side wall lightning protection system according to claim 1, wherein the conductive protection plate has a smooth surface.