JP7563974B2 - Lightning protection device - Google Patents

Description

The technology disclosed in this specification relates to a lightning protection device installed on the exterior of a building.

The Building Standards Act requires that buildings over 20 meters in height be equipped with effective lightning protection equipment. For example, lightning rods are installed on the roofs of such buildings as part of the lightning protection equipment.

In buildings, lightning is not limited to striking the rooftop, and can also strike the exterior of higher floors. For this reason, it is desirable to install lightning protection devices on the exterior of buildings as well. Conventionally, there is known a lightning protection device that ensures grounding by fixing a vertically extending lightning receiving member to the side of the PC board that constitutes the exterior of a building and electrically connecting the lightning receiving member to an anchor bolt for fixing the PC board (see, for example, Patent Document 1).

JP 2001-86631 A

When installing a lightning protection device on the exterior of a building, the lightning receiving member needs to be grounded to the ground surface via a structure such as a steel frame. This requires a penetration in the exterior to ensure an electrical connection path between the lightning receiving member and the structure, which may reduce the airtightness (watertightness) of the exterior. Furthermore, when installing a lightning protection device on the exterior of a building, the lightning protection device may hinder the oscillation of the exterior panel during an earthquake. With the above-mentioned conventional technology, it is difficult to simultaneously prevent the decrease in the airtightness (watertightness) of the exterior and ensure the oscillation of the exterior panel when installing a lightning protection device on the exterior of a building.

This specification discloses a technology that can solve at least some of the problems mentioned above.

The technology disclosed in this specification can be realized, for example, in the following forms:

(1) The lightning protection device disclosed in this specification is a lightning protection device installed on the exterior of a building. The exterior of the building has a plurality of exterior panels arranged vertically and horizontally through horizontal joints and vertical joints, a plurality of conductive base members that support the weight of each of the exterior panels and are grounded through the building frame, and a plurality of fulcrum members installed in the horizontal joints, the plurality of fulcrum members constituting fulcrums for the swinging of the exterior panels located above each of the fulcrum members. The lightning protection device includes a mounting member and a lightning receiving member. The mounting member is a conductive member that is installed below each of the fulcrum members at the horizontal joints, is attached to the base members by being attached to the base members, and is electrically connected to the base members, and has an outer part located outside the outer surface of the exterior panels. The lightning receiving member is a conductive member that is attached to the outer part of each of the mounting members by being attached to the mounting members, and is electrically connected to the mounting members, and is located outside the outer surface of the exterior panels.

In this way, the lightning protection device includes a lightning receiving member located outside the outer surface of the exterior panel, and the lightning receiving member is grounded to the ground surface via the mounting member, base member, and building frame. Therefore, with this lightning protection device, lightning strikes on the exterior of the building are received by the lightning receiving member and can be channeled to the ground surface via the mounting member, etc., thereby protecting the exterior from lightning strikes.

In addition, in this lightning arrester, the mounting member for mounting the lightning receiving member is installed in the horizontal joint. Therefore, according to this lightning arrester, an electrical connection path between the lightning receiving member and the body can be secured in the horizontal joint, and the decrease in the airtightness (watertightness) of the exterior caused by installing the lightning arrester on the exterior can be suppressed. In addition, in this lightning arrester, the lightning receiving member is located outside the outer surface of the exterior panel, so it does not interfere with the exterior panel that swings during an earthquake. In addition, since the mounting member is installed below the fulcrum member in the horizontal joint 22, interference of the mounting member with the exterior panel that swings during an earthquake is also suppressed. Therefore, according to this lightning arrester, it is possible to suppress the lightning arrester installed on the exterior from impeding the swing of the exterior panel during an earthquake.

(2) In the above lightning protection device, the lightning receiving members may be long members extending parallel to the horizontal joints. With this lightning protection device, each lightning receiving member can be installed over a wide range in the width direction of the exterior of the building, and the exterior can be effectively protected from lightning strikes.

(3) In the above lightning protection device, one end of one of the lightning receiving members may be attached to the outer portion of one of the mounting members, and the other end of the one of the lightning receiving members may be attached to the outer portion of another mounting member that is horizontally adjacent to the one of the mounting members. With this lightning protection device, each of the lightning receiving members can be stably supported by two mounting members, and each of the lightning receiving members can be installed over a wider range in the width direction of the exterior of the building, thereby providing extremely effective protection of the exterior from lightning strikes.

(4) In the above lightning protection device, the width of each of the mounting members in a direction parallel to the horizontal joint may be 30% or less of the width of each of the exterior panels in a direction parallel to the horizontal joint. This lightning protection device effectively prevents the mounting members from interfering with the exterior panels that sway during an earthquake, effectively preventing the lightning protection device installed on the exterior from impeding the swaying of the exterior panels during an earthquake.

The technology disclosed in this specification can be realized in various forms, for example, in the form of a lightning protection device, a building equipped with a lightning protection device, etc.

FIG. 1 is an explanatory diagram illustrating a schematic side configuration of a building 100 according to an embodiment of the present invention. FIG. 1 is an explanatory diagram illustrating a schematic side configuration of a portion of a building 100 according to an embodiment of the present invention. FIG. 1 is an explanatory diagram illustrating a schematic cross-sectional configuration of a portion of a building 100 according to an embodiment of the present invention. FIG. 1 is an explanatory diagram showing a detailed configuration of a mounting member 50. FIG. 1 is an explanatory diagram showing a detailed configuration of a lightning receiving member 60. FIG. 1 is an explanatory diagram showing a method for installing a lightning arrester 10. FIG. 1 is an explanatory diagram showing a method for installing a lightning arrester 10. FIG. 1 is an explanatory diagram showing a method for installing a lightning arrester 10.

A. Embodiments:
A-1. Configuration of the building 100:
FIG. 1 is an explanatory diagram that shows a schematic side configuration of a building 100 in this embodiment. FIG. 2 is an explanatory diagram that shows a schematic side configuration of a part of the building 100 in this embodiment. FIG. 2 shows an enlarged view of the side configuration at part X1 in FIG. 1. FIG. 3 is an explanatory diagram that shows a schematic cross-sectional configuration of a part of the building 100 in this embodiment. FIG. 3 shows an enlarged view of the cross-sectional configuration at the position III-III in FIG. 2. In each figure, the Z-axis direction is the vertical direction, the positive Z-axis direction is the upward direction, and the negative Z-axis direction is the downward direction. This also applies to the subsequent figures.

As shown in FIG. 1, the building 100 has an exterior 20. The exterior 20 has a plurality of exterior panels 21. Each exterior panel 21 is a plate-shaped member that is approximately rectangular when viewed in the horizontal direction. The multiple exterior panels 21 are arranged vertically and horizontally (horizontally and vertically) via horizontal joints 22 and vertical joints 23. In this embodiment, the exterior panels 21 are made of extruded cement boards. Also, in this embodiment, the multiple exterior panels 21 are installed by a so-called vertical installation method.

As shown in Figs. 2 and 3, the exterior 20 of the building 100 includes a base member 31, a clip member 32, a nut member 33, a bolt 34, a locking block 35, a sealant 36, a gasket 37, a rain barrier 38, a drip plate 46, and a sealing rubber 44. The base member 31 is a member that supports the weight of each exterior panel 21. In this embodiment, the base member 31 is a member that extends horizontally along each horizontal joint 22, and more specifically, is made of CT steel (CT-100 x 50 x 6 x 8). The base member 31 is installed in an orientation such that the flanges are parallel to the vertical direction and the webs are parallel to the horizontal direction.

As shown in FIG. 3, a first bracket 41 (e.g., angle iron: L-90x90x7) is joined to the base member 31 (flange), a second bracket 42 (e.g., angle iron: L-90x90x7) is joined to the first bracket 41, and the second bracket 42 is joined to the steel frame 40 (e.g., H-shaped steel beam) of the building 100. As a result, the base member 31 is supported by the steel frame 40 and is grounded to the ground surface via the steel frame 40 (see dashed arrow in FIG. 3). The first bracket 41 and the second bracket 42 are arranged at a predetermined pitch (e.g., 500 mm pitch) along the horizontal direction.

As shown in FIG. 3, each exterior panel 21 is supported on the base member 31 via the clip members 32 in a state where it is clamped by the clip members 32 and the nut members 33 which are fastened together by the bolts 34. Two sets of the clip members 32 and the nut members 33 are arranged at the upper end and the lower end of each exterior panel 21.

As shown in Figures 2 and 3, the locking block 35 is positioned in the horizontal joint 22 at approximately the center of the width of each exterior panel 21 (X-axis direction in Figure 2), and constitutes a fulcrum for the swing of the exterior panel 21 located above the locking block 35. That is, as shown in Figure 2, during an earthquake, each exterior panel 21 swings around the position of the locking block 35 as a fulcrum, repeatedly switching between a tilted position as shown by the dashed line and a tilted position in the opposite direction. The locking block 35 is an example of a fulcrum member in the claims.

As shown in FIG. 3, the sealant 36 is a member that seals between the base member 31 (the upper end of the flange) and the indoor surface of the lower end of each exterior panel 21. The gasket 37 is a member that seals between the base member 31 (the lower end of the flange) and the indoor surface of the upper end of each exterior panel 21. The rain barrier 38 is a member that is installed in the horizontal joint 22 and extends parallel to the horizontal joint 22, and prevents rainwater from entering the horizontal joint 22. The rain barrier 38 is provided with an air introduction hole (not shown). A similar rain barrier is also installed in the vertical joint 23. In this way, the horizontal joint 22 and the vertical joint 23 in the exterior 20 of this embodiment are equal pressure joints that ensure airtightness and watertightness on the indoor side of the joints by the sealant 36 and the gasket 37, and prevent rainwater from entering by eliminating the pressure difference between the outside air and the inside of the joints. Note that the rain barrier 38 is not shown in Figure 2.

As shown in FIG. 3, the drain plate 46 is a plate-shaped member with a cross-sectional shape that extends along the outdoor surface of the upper flange of the base member 31 and the upper surface of the web, and further reaches the upper surface of the exterior panel 21. The drain plate 46 is formed, for example, from a steel plate. The sealing rubber 44 is a member with a roughly T-shaped cross section, and is installed so as to press down on the outdoor end of the drain plate 46. The drain plate 46 and sealing rubber 44 prevent rainwater from entering the room.

A-2. Configuration of the lightning protection device 10 installed in the building 100:
The building 100 of this embodiment is a relatively high-rise building with a height exceeding 20 m. Therefore, in accordance with the Building Standards Act, lightning protection equipment is installed in the part of the building 100 that exceeds 20 m in height. Specifically, as shown in Fig. 1, a lightning protection device 10 is installed on the exterior 20 of the part of the building 100 that exceeds 20 m in height. In addition to the lightning protection device 10 installed on the exterior, another lightning protection equipment (e.g., a lightning rod) may be installed on the roof of the building 100.

As shown in Figs. 1 to 3, the lightning arrester 10 includes a mounting member 50 and a lightning receiving member 60. Fig. 4 is an explanatory diagram showing the detailed configuration of the mounting member 50. Fig. 4 shows the planar (top) configuration of the mounting member 50. Fig. 5 is an explanatory diagram showing the detailed configuration of the lightning receiving member 60. Fig. 5 shows the planar (top) configuration of the lightning receiving member 60.

2 to 4, the mounting member 50 is installed below the locking block 35 in the horizontal joint 22. The mounting member 50 has a configuration in which a plate-shaped member of a predetermined thickness (e.g., 2 mm) is bent, and is made of a conductive material (e.g., aluminum). In this embodiment, the shape of the cross section (YZ cross section in FIG. 3) of the mounting member 50 perpendicular to the extension direction of the horizontal joint 22 has a flat plate-shaped portion disposed on the upper surface of the web of the base member 31, a portion extending vertically downward from the outdoor end of the flat plate-shaped portion and bending midway to extend diagonally downward, and a flat plate-shaped portion extending horizontally from the outdoor end of the portion toward the outdoor side to the outside of the outer surface of the exterior panel 21. That is, the mounting member 50 has an outer portion 51 located outside the outer surface of the exterior panel 21. The mounting member 50 has through holes 52 and 54 formed therein. The mounting member 50 is attached to the base member 31 by a screw 58 inserted into the through hole 52, and is thereby electrically connected to the base member 31. The width W1 of the mounting member 50 along the extension direction of the horizontal joint 22 (the X-axis direction in FIG. 2) is preferably 30% or less of the width W2 of the exterior panel 21, and more preferably 20% or less of the width W2 of the exterior panel 21.

3 and 5, the lightning receiving member 60 has a configuration in which a plate-shaped member of a predetermined thickness (e.g., 2 mm) is bent, and is formed of a conductive material (e.g., aluminum). In this embodiment, the shape of the cross section (YZ cross section in FIG. 3) of the lightning receiving member 60 perpendicular to the extension direction of the horizontal joint 22 is approximately L-shaped (a shape composed of a flat plate-shaped part parallel to the Y axis and a flat plate-shaped part extending downward from the outdoor end of the flat plate-shaped part). A through hole 62 is formed in the lightning receiving member 60. As shown in FIGS. 2 and 3, the lightning receiving member 60 is attached to the outer part 51 of the mounting member 50 and is located outside the outer surface of the exterior panel 21. More specifically, the lightning receiving members 60 are elongated members extending horizontally, and one end of a certain lightning receiving member 60 is attached to an outer portion 51 of a certain mounting member 50 by a bolt 68 inserted into a through hole 62 formed in the one end, and the other end of the lightning receiving member 60 is attached to an outer portion 51 of another mounting member 50 horizontally adjacent to the certain mounting member 50 by a bolt 68 inserted into a through hole 62 formed in the other end. That is, each lightning receiving member 60 extends, as viewed in the horizontal direction, along the horizontal joint 22 from a position near the center in the width direction of a certain exterior panel 21 to a position near the center in the width direction of the exterior panel 21 adjacent to the certain exterior panel 21. The lightning receiving member 60 is attached to the mounting member 50, thereby being electrically connected to the mounting member 50. As a result, the lightning receiving member 60 is grounded to the ground surface via the mounting member 50, the base member 31, the first bracket 41, the second bracket 42, and the steel frame 40 (see the dashed arrow in Figure 3).

Figures 6 to 8 are explanatory diagrams showing how to install the lightning arrester 10. First, as shown in section A of Figure 6, the base member 31 is installed, and the drain plate 46 is placed on top of the base member 31. Next, as shown in section B of Figure 6, the sealing rubber 44 is installed on the top surface of the exterior panel 21 so as to press down on the outdoor side end of the drain plate 46 from above, thereby sealing off the water.

Next, as shown in column A of FIG. 7, the mounting member 50 is installed on the drain plate 46. A part (outer part 51) of the installed mounting member 50 is located outside the outer surface of the exterior panel 21. A bolt (stud bolt) 68 for fastening the lightning receiving member 60 is attached to the outer part 51 of the mounting member 50. Next, as shown in column B of FIG. 7, the mounting member 50 is fixed to the base member 31 with a screw 58.

Next, as shown in column A of FIG. 8, the lightning receiving member 60 is installed on the mounting member 50. As shown in FIG. 5, the through hole 62 formed in the lightning receiving member 60 has an expanded portion (loose hole portion), and the lightning receiving member 60 is installed by inserting the bolt 68 into the expanded portion. After the bolt 68 is inserted into the through hole 62 of the lightning receiving member 60, the lightning receiving member 60 is shifted horizontally so that the bolt 68 is inserted into the portion of the through hole 62 other than the expanded portion. Finally, as shown in column B of FIG. 8, the lightning receiving member 60 is fixed to the mounting member 50 by tightening a nut on the bolt 68. The above steps complete the installation of the lightning arrester 10 on the building 100.

A-3. Advantages of this embodiment:
As described above, the lightning arrester 10 of this embodiment is a lightning arrester installed on the exterior 20 of the building 100. The exterior 20 of the building 100 has a plurality of exterior panels 21, a plurality of base members 31, and a plurality of locking blocks 35. The plurality of exterior panels 21 are arranged vertically and horizontally via horizontal joints 22 and vertical joints 23. Each base member 31 supports the weight of each exterior panel 21 and is a conductive member grounded via the steel frame 40. Each locking block 35 is installed in the horizontal joint 22 and constitutes a fulcrum for the swing of the exterior panel 21 located above each locking block 35.

The lightning arrester 10 of this embodiment also includes a mounting member 50 and a lightning receiving member 60. The mounting member 50 is a conductive member, and is installed below each locking block 35 in the horizontal joint 22. The mounting member 50 is attached to the base member 31, thereby electrically connecting it to the base member 31. The mounting member 50 has an outer portion 51 located outside the outer surface of the exterior panel 21. The lightning receiving member 60 is a conductive member, and is attached to the outer portion 51 of each mounting member 50, thereby electrically connecting it to the mounting member 50. The lightning receiving member 60 is also located outside the outer surface of the exterior panel 21.

In this way, the lightning protection device 10 of this embodiment includes a lightning receiving member 60 located outside the outer surface of the exterior panel 21, and the lightning receiving member 60 is grounded to the ground surface via the mounting member 50, the base member 31, the steel frame 40, etc. Therefore, according to the lightning protection device 10 of this embodiment, a lightning strike on the exterior 20 of the building 100 can be received by the lightning receiving member 60 and can be channeled to the ground surface via the mounting member 50, etc., thereby protecting the exterior 20 from lightning strikes.

In addition, in the lightning arrester 10 of this embodiment, the mounting member 50 for mounting the lightning receiving member 60 is installed in the horizontal joint 22. Therefore, according to the lightning arrester 10 of this embodiment, the electrical connection path between the lightning receiving member 60 and the steel frame 40 can be secured in the horizontal joint 22, and the decrease in the airtightness (watertightness) of the exterior 20 caused by installing the lightning arrester 10 on the exterior 20 can be suppressed. In addition, in the lightning arrester 10 of this embodiment, the lightning receiving member 60 is located outside the outer surface of the exterior panel 21, so it does not interfere with the exterior panel 21 that swings during an earthquake. In addition, since the mounting member 50 is installed below the locking block 35, the mounting member 50 is also suppressed from interfering with the exterior panel 21 that swings during an earthquake. Therefore, according to the lightning arrester 10 of this embodiment, it is possible to suppress the lightning arrester 10 installed on the exterior 20 from impeding the swing of the exterior panel 21 during an earthquake.

In addition, in the lightning protection device 10 of this embodiment, the lightning receiving members 60 are long members that extend parallel to the horizontal joints 22. Therefore, according to the lightning protection device 10 of this embodiment, each lightning receiving member 60 can be installed over a wide range in the width direction of the exterior 20 of the building 100, and the exterior 20 can be effectively protected from lightning strikes.

In addition, in the lightning protection device 10 of this embodiment, one end of one lightning receiving member 60 is attached to the outer portion 51 of one mounting member 50, and the other end of the one lightning receiving member 60 is attached to the outer portion 51 of another mounting member 50 that is horizontally adjacent to the one mounting member 50. Therefore, according to the lightning protection device 10 of this embodiment, each lightning receiving member 60 can be stably supported by two mounting members 50, and each lightning receiving member 60 can be installed over a wider range in the width direction of the exterior 20 of the building 100, thereby providing extremely effective protection for the exterior 20 from lightning strikes.

In addition, in the lightning protection device 10 of this embodiment, it is preferable that the width W1 of each mounting member 50 in the direction parallel to the horizontal joint 22 is 30% or less of the width W2 of each exterior panel 21 in the direction parallel to the horizontal joint 22. With this configuration, the mounting member 50 is effectively prevented from interfering with the exterior panel 21 that swings during an earthquake, and therefore the lightning protection device 10 installed on the exterior 20 can be effectively prevented from impeding the swinging of the exterior panel 21 during an earthquake.

In addition, in this embodiment, the lightning protection devices 10 (lightning receiving members 60) are provided along all horizontal joints 22 in the part of the building 100 that exceeds a height of 20 m. Therefore, according to this embodiment, the lightning protection devices 10 (lightning receiving members 60) can be provided at the pitch unit of the horizontal joints 22 in the exterior 20 of the building 100, and the exterior 20 can be effectively protected from lightning strikes.

In addition, the lightning protection device 10 in this embodiment can be installed from the indoor side of the building 100 when the exterior panel 21 is erected (when the horizontal joint 22 is constructed), so no external scaffolding is required, making installation easier and reducing costs.

B. Variations:
The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified in various forms without departing from the spirit of the invention. For example, the following modifications are also possible.

The configurations of the building 100 and the lightning protection device 10 in the above embodiment are merely examples and can be modified in various ways. For example, in the above embodiment, the lightning protection device 10 (lightning receiving member 60) is provided along all horizontal joints 22 in the part of the building 100 that exceeds a height of 20 m, but this configuration is not necessarily required, and it is sufficient that the lightning protection device 10 (lightning receiving member 60) is provided along at least one horizontal joint 22.

In the above embodiment, each lightning receiving member 60 is attached across two horizontally adjacent mounting members 50, but each lightning receiving member 60 may be attached to one mounting member 50. Also, in the above embodiment, each lightning receiving member 60 is an elongated member extending parallel to the horizontal joint 22, but the shape of the lightning receiving member 60 does not necessarily have to be this shape.

In the above embodiment, an extruded cement board is used as the exterior panel 21, but other exterior panels (e.g., PC boards) may also be used as the exterior panel 21.

10: Lightning protection device 20: Exterior 21: Exterior panel 22: Horizontal joint 23: Vertical joint 31: Base material 32: Clip material 33: Nut material 34: Bolt 35: Locking block 36: Sealing material 37: Gasket 38: Rain barrier 40: Steel frame 41: First bracket 42: Second bracket 44: Rubber seal 46: Water drain plate 50: Mounting material 51: Outer part 52: Through hole 58: Screw 60: Lightning protection material 62: Through hole 68: Bolt 100: Building

Claims (3)

A lightning protection device to be installed on the exterior of a building, the lightning protection device having a plurality of exterior panels arranged vertically and horizontally via horizontal joints and vertical joints, a plurality of conductive base members that support the weight of each of the exterior panels and are grounded via a building structure, and a plurality of fulcrum members installed in the horizontal joints, the plurality of fulcrum members constituting fulcrums for the swinging of the exterior panels located above each of the fulcrum members,
a conductive mounting member that is installed below each of the support members in the horizontal joints, is attached to the base member to be electrically connected to the base member, and has an outer portion located outside the outer surface of the exterior panel;
a conductive lightning receiving member that is attached to the outer portion of each of the mounting members and electrically connected to the mounting members, and that is located outside the outer surface of the exterior panel;
Equipped with
A lightning arrester , wherein an end of one of the lightning receiving members and an end of the other of the lightning receiving members are attached to the outer portion of the mounting member below the fulcrum member . 2. The lightning protection device according to claim 1,
A lightning protection device, wherein the lightning receiving member is a long member extending parallel to the horizontal joint. The lightning protection device according to claim 1 or 2 ,
A lightning arrester, wherein the width of each of the mounting members in a direction parallel to the horizontal joint is 30% or less of the width of each of the exterior panels in a direction parallel to the horizontal joint.

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