Lightning protection facility

Abstract

To provide a lightning protection facility capable of suppressing thermal expansion and contraction of a lightning conductor while solving problems of level difference, scattering, and visibility caused by installation of the lightning conductor.SOLUTION: A lightning conductor 5 is installed on a floor 4 of a rooftop of a building 3, and the lightning conductor 5 is embedded in the floor 4 in a state that only a portion of a surface facing an upper side of the lightning conductor is exposed to outdoors.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to lightning protection equipment in which a lightning conductor is installed on the floor of a building roof.

Background Art

[0002] Patent Document 1 shows lightning protection equipment in which a lightning conductor (lightning protection angle pipe 3) is fitted into a groove 2 installed on the roof floor.

[0003] When directly installing a lightning conductor on the roof floor, there are problems such as a relatively large step being formed on the roof floor, the risk of the lightning conductor being scattered by the wind, and poor appearance. However, in the lightning protection equipment described in Patent Document 1, a rectangular lightning conductor is fitted into a concave groove, and by making the upper surface of the lightning conductor flush with the roof floor surface, the unevenness on the roof floor is eliminated, and problems such as a large step being formed on the roof floor, the risk of the lightning conductor being scattered by the wind, and poor appearance can be solved.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since the entire surface facing the upper side of the lightning conductor is exposed and the area receiving sunlight is large, the thermal expansion and contraction of the lightning conductor due to the influence of solar heat tend to be large, and there is room for improvement in this regard.

[0006] In view of this situation, the main problem of the present invention is to provide lightning protection equipment that can suppress the thermal expansion and contraction of the lightning conductor while solving the problems of steps, scattering, and appearance caused by the installation of the lightning conductor.

Means for Solving the Problems

[0007] In a lightning protection facility where a lightning conductor is installed on the floor of the rooftop of a building, the lightning conductor is embedded in the floor in a state where only a part of the surface facing the upper side thereof is exposed outdoors.

[0008] According to this configuration, by embedding the lightning conductor in the floor in a state where only a part of the surface facing the upper side of the lightning conductor is exposed outdoors, it is possible to solve the problems of steps, scattering, and appearance caused by installing the lightning conductor, and while increasing the cross-sectional area of the lightning conductor to reduce the electrical resistance, the area receiving sunlight can be reduced to suppress the thermal expansion and contraction of the lightning conductor.

[0009] The second characteristic configuration of the present invention is that the lightning conductor is formed in an L shape including a substantially horizontal fixing plate portion fixed to a substantially horizontal fixed portion on the floor side and an exposed plate portion rising from the fixing plate portion so that the upper end portion is exposed upward from the floor.

[0010] According to this configuration, since the fixing plate portion fixed to the fixed portion on the floor side (such as a groove formed in the floor or a beam under the floor) is configured to be substantially horizontal, the lightning conductor can be easily fixed to the fixed portion, and since only the upper end portion of the exposed plate portion rising from the fixing plate portion is exposed from the floor, the exposure of the lightning conductor outdoors can be suppressed as much as possible and the area receiving sunlight can be made as small as possible. Therefore, the thermal expansion and contraction of the lightning conductor can be further suppressed, and while suppressing the exposure outdoors, the cross-sectional area of the lightning conductor can be increased to reduce the electrical resistance.

[0011] The third characteristic configuration of the present invention is that the height position of the upper end portion of the exposed plate portion in a state where the lightning conductor is fixed to the fixed portion is set above the designed height position of the floor.

[0012] According to this configuration, even if there are some irregularities on the rooftop floor due to construction errors or the like, the upper end of the exposed plate portion can be made to protrude above the floor. Therefore, it is possible to prevent all of the lightning conductors from being buried in the floor, and the lightning receiving performance can be ensured well.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0014] 〔First Embodiment〕 The first embodiment of the lightning protection equipment according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, in the lightning protection equipment 1, a lightning conductor 5 is installed on the rooftop floor 4 of the building 3. As shown in FIG. 2, most of the surface of the lightning conductor 5 facing the upper side in plan view is buried in the floor 4, and only a part of the surface of the lightning conductor 5 facing the upper side is buried in the floor 4 in a state of being exposed outdoors.

[0015] To add an explanation, the lightning protection conductor 5 is formed in an L-shape including a substantially horizontal fixing plate portion 8 fixed to a substantially horizontal fixed portion 7 on the floor 4 side, and an exposed plate portion 9 rising from the fixing plate portion 8 such that the upper end portion 9A is exposed from the floor 4. In this way, the lightning protection conductor 5 includes a plate-shaped fixing plate portion 8 extending in a substantially horizontal direction and a plate-shaped exposed plate portion 9 rising upward from an end portion of the fixing plate portion 8, and is formed in an L-shape when viewed in the longitudinal direction of the lightning protection conductor 5. The lightning protection conductor 5 is constituted by, for example, an L-shaped steel angle material. Although not shown in the figure, in FIG. 2, it is provided in a long shape extending in the vertical direction of the drawing sheet, and the lightning protection conductors 5 are continuously arranged in series in the vertical direction of the drawing sheet (the longitudinal direction of the lightning protection conductor 5). Thereby, as shown in FIG. 1, even in a place where the helipad 6 is installed on the roof of the building 3, the lightning protection conductor 5 can be arranged so as to surround the helipad 6, and the function as the lightning protection facility 1 can be sufficiently ensured. In FIG. 1, an example is shown in which the lightning protection conductor 5 is arranged in a square shape so as to surround the helipad 6. However, the arrangement pattern of the lightning protection conductor 5 with respect to the helipad 6 can be appropriately changed. For example, the lightning protection conductors 5 may be arranged so as to sandwich the helipad 6 from the vertical direction or the horizontal direction on the drawing sheet with two parallel lightning protection conductors 5.

[0016] Next, the fixing structure of the lightning protection conductor 5 will be described. As shown in FIG. 2, in this embodiment, the floor 4 is made of concrete or reinforced concrete, and a lightning protection conductor groove 11 recessed downward is formed in the floor 4 for installing the lightning protection conductor 5. The lightning protection conductor groove 11 is formed, for example, in a rectangular shape with a bottom, and its bottom surface portion 12 is formed in a planar shape extending in the horizontal direction, and this bottom surface portion 12 serves as the substantially horizontal fixed portion 7. The lightning protection conductor groove 11 is formed wider than the fixing plate portion 8 of the lightning protection conductor 5 in a plan view, and the entire fixing plate portion 8 of the lightning protection conductor 5 is provided in a buried state in the lightning protection conductor groove 11.

[0017] And the lightning protection conductor 5 has its fixing plate portion 8 fixed to the bottom surface portion 12 of the lightning protection conductor groove 11 which is the fixed portion 7 by using the first fixing member 13. To add an explanation, an anchor 14 is installed on the bottom surface portion 12 of the lightning protection conductor groove 11 in a state of protruding upward from the bottom surface portion 12. With the anchor 14 inserted through the insertion hole 8A formed in the fixing plate portion 8 of the lightning protection conductor 5, a pair of upper and lower nuts 15 are fastened to clamp the fixing plate portion 8 in the vertical direction with the nuts 15, so that the first fixing member 13 (the anchor 14 and the pair of nuts 15) fixes the lightning protection conductor 5 at a desired height with a predetermined interval from the bottom surface portion 12 (fixed portion 7) of the lightning protection conductor groove 11. Since it is possible to adjust at what length (what height) in the length direction of the anchor 14 to fasten and fix, it is possible to appropriately adjust at what interval to fix the lightning protection conductor 5 with respect to the bottom surface portion 12 (fixed portion 7) of the lightning protection conductor groove 11. The lightning protection conductor 5 is electrically connected to the steel frame of the building 3 via connection terminals and lead wires.

[0018] The lightning protection conductor 5 is provided in a state where only the upper end portion 9A of the exposed plate portion 9 protrudes upward from the floor 4 and is exposed outdoors with the lightning protection conductor 5 fixed to the fixed portion 7. Therefore, the height position of the upper end portion 9A of the exposed plate portion 9 in the state of being fixed to the fixed portion 7 is set above the designed height position of the floor 4. Therefore, even if there is some unevenness on the rooftop floor 4 due to construction errors or the like, only the upper end portion 9A of the exposed plate portion 9 can be made to protrude upward from the upper surface of the floor 4 and be exposed outdoors, preventing all of the lightning protection conductor 5 from being buried in the floor 4.

[0019] The lightning protection conductor groove 11 is filled with a filler 16 such as a caulking agent, and this filler 16 is filled in the lightning protection conductor groove 11 so that its upper surface is flush with the upper surface of the floor 4. The lightning protection conductor 5 is buried in the filler 16 with only the upper end portion 9A of the exposed plate portion 9 protruding upward from the filler 16, and only the upper surface and side surface of the upper end portion 9A of the exposed plate portion 9 protrude upward from the filler 16 and are exposed outdoors.

[0020] According to the above configuration, among the lightning protection conductors 5, the upper surface portion of the fixing plate portion 8 is embedded in the floor 4, and only the upper end portion 9A of the exposed plate portion 9 protrudes above the upper surface portion of the floor 4. Therefore, the exposure of the lightning protection conductor 5 to the outdoors above the floor 4 is minimized, and the area receiving sunlight is minimized as much as possible. Therefore, while increasing the cross-sectional area of the lightning protection conductor 5 to reduce the electrical resistance, the exposure above the floor 4 can be reduced to minimize the area receiving sunlight, thereby suppressing the thermal expansion and contraction of the lightning protection conductor 5. Moreover, even when the lightning protection conductor 5 thermally expands and contracts, the thermal expansion and contraction can be absorbed by the filler 16.

[0021] 〔Second Embodiment〕 Next, a second embodiment of the lightning protection equipment according to the present invention will be described with reference to the drawings. In describing the second embodiment of the lightning protection equipment, the configuration different from the first embodiment will be mainly described, and the description of the same configuration as the first embodiment will be omitted.

[0022] As shown in FIG. 3, in this embodiment, the floor 4 on which the lightning protection conductor 5 is installed is configured as a reinforced concrete floor supported upward by a beam 17 made of H-shaped steel on the roof. Therefore, the beam 17 is provided in a state of supporting the floor 4 from below, and the upper flange portion 17A of the beam 17 extends in the horizontal direction. The lightning protection conductor 5 is fixed with the flange portion 17A as a substantially horizontal fixed portion 7.

[0023] The lightning protection conductor 5 has its fixing plate portion 8 fixed to the flange portion 17A of the beam 17 which is the fixed portion 7 using the second fixing member 18. To add an explanation, a high nut 19 is fixed to the upper surface of the upper flange portion 17A of the beam 17 by welding, and a bolt 20 is screwed into the high nut 19. The lightning protection conductor 5 is in a state where the bolt 20 is inserted through the insertion hole 8A formed in the fixing plate portion 8, and by fastening a pair of upper and lower nuts 15 to clamp the fixing plate portion 8 in the vertical direction with the nuts 15, it is fixed at a desired height with a predetermined interval from the upper flange portion 17A of the beam 17 by the second fixing member 18 (high nut 19, bolt 20, and a pair of nuts 15). Since it is possible to adjust at what length (what height) in the length direction of the bolt 20 to fasten and fix, it is possible to appropriately adjust at what interval to fix the lightning protection conductor 5 with respect to the upper flange portion 17A (fixed portion 7) on the upper side. By fixing the lightning protection conductor 5 to the fixed portion 7 in this way, the lightning protection conductor 5 is electrically connected to the beam 17 (steel frame) of the building 3 via the conductive second fixing member 18.

[0024] In the present embodiment, an upper groove 21 that recesses downward is formed at a location where the exposed plate portion 9 of the lightning protection conductor 5 exists on the floor 4. The upper groove 21 is formed wider than the exposed plate portion 9 of the lightning protection conductor 5, but is formed narrower than the lightning protection conductor groove 11 of the first embodiment. Due to the formation of the upper groove 21 on the floor 4, only the upper end portion 9A of the exposed plate portion 9 of the lightning protection conductor 5 protrudes above the upper surface portion of the floor 4. Different from the first embodiment, not the entire lightning protection conductor 5 is provided in the upper groove 21, but only a part of the exposed plate portion 9 of the lightning protection conductor 5 is provided in the upper groove 21. To add an explanation, only the upper end side portion of the exposed plate portion 9 of the lightning protection conductor 5 exists in the upper groove 21, and only the upper end portion 9A of the exposed plate portion 9 protrudes above the upper surface portion of the floor 4.

[0025] The upper groove 21 is filled with a filler 16 such as a caulking agent, and this filler 16 is filled in the upper groove 21 so that its upper surface is flush with the upper surface of the floor 4. Only the upper end portion 9A of the exposed plate portion 9 is embedded in the filler 16 in a state of protruding upward from the filler 16, and only the upper surface and the side surface of the upper end portion 9A in the exposed plate portion 9 are exposed to the outside. Therefore, while increasing the cross-sectional area of the lightning conductor 5, the area receiving sunlight can be reduced to suppress the thermal expansion and contraction of the lightning conductor 5. Moreover, even when the upper part of the exposed plate portion 9 in the lightning conductor 5 undergoes thermal expansion and contraction, the thermal expansion and contraction can be absorbed by the filler 16.

[0026] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of each of the embodiments described below are not limited to being applied alone, and can also be applied in combination with the configurations of other embodiments.

[0027] (1) In the above embodiment, the configuration in which only the upper surface and the side surface of the upper end portion 9A in the lightning conductor 5 are exposed to the outside has been described as an example, but it is not limited to such a configuration. For example, the height of the upper surface of the exposed plate portion 9 and the upper surface of the filler 16 may be made the same, and only the upper surface of the upper end portion 9A of the exposed plate portion 9 in the lightning conductor 5 may be exposed to the outside.

[0028] (2) In the above embodiment, the configuration in which the filler 16 is filled in the lightning conductor groove 11 and the upper groove 21 has been described as an example, but it is not limited to such a configuration. For example, a resin fitting may be installed in the lightning conductor groove 11 and the upper groove 21 to allow thermal expansion and contraction of the lightning conductor 5 while only the upper end portion 9A of the exposed plate portion 9 in the lightning conductor 5 is exposed. When installing such a resin fitting in this way, a slit through which the exposed plate portion 9 is inserted in the vertical direction is formed, so that the resin fitting can be installed in the lightning conductor groove 11 and the upper groove 21 with the upper end portion 9A of the exposed plate portion 9 exposed.

[0029] (3) In the above-described embodiment, the lightning conductor 5 is described by taking as an example a configuration in which it has an L-shape including a plate-shaped fixing plate portion 8 extending in a substantially horizontal direction and a plate-shaped exposed plate portion 9 rising upward from an end portion of the fixing plate portion 8. However, the shape of the lightning conductor 5 may be changed as appropriate. The lightning conductor 5 may have an inverted T-shape including a plate-shaped fixing plate portion 8 extending in a substantially horizontal direction and a plate-shaped exposed plate portion 9 rising upward from a central portion in the width direction of the fixing plate portion 8, or may have an I-shape including only the exposed plate portion 9. Further, in the above-described embodiment, the fixed portion 7 is substantially horizontal. However, when the lightning conductor 5 has an I-shape or the like, the fixed portion 7 may be substantially vertical, such as using a side surface portion of the lightning conductor groove 11 as the fixed portion 7.

Explanation of Signs

[0030] 1 Lightning protection equipment 3 Building 4 Floor 5 Lightning conductor 7 Fixed portion 8 Fixing plate portion 9 Exposed plate portion

Claims

1. In a lightning protection facility where a lightning conductor is installed on the floor of a building rooftop, A lightning protection facility in which the lightning conductor is embedded in the floor in a state where only a part of the surface facing the upper side thereof is exposed to the outside.

2. The lightning protection facility according to claim 1, wherein the lightning conductor is formed in an L shape including a substantially horizontal fixing plate portion fixed to a substantially horizontal fixed portion on the floor side, and an exposed plate portion rising from the fixing plate portion so that the upper end portion is exposed from the floor.

3. The lightning protection facility according to claim 2, wherein the height position of the upper end portion of the exposed plate portion in a state where the lightning conductor is fixed to the fixed portion is set above the designed height position of the floor.

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