Connection body for lightning protection

Abstract

To ensure electrical connection between bar steels with a simple structure.SOLUTION: This connection body for lightning protection comprises, in the extending direction of a steel bar R buried in a precast concrete block B: a bypass conduction unit 2 disposed around the steel bar R; an inner end installation member 3 that is brought into contact, so as to be conductive, with the end of the bypass conduction unit 2 near the inside of the precast concrete block B; a fixed member 4 that is engaged with a helical projection R1 included in the steel bar R, to be fixed in the steel bar R in the extending direction, and that conducts the steel bar R to the inner end installation member 3; and an outer end installation member 5 that is brought into contact, so as to be conductive, with the end of the bypass conduction unit 2 near the outside of the precast concrete block B and the steel bar R belonging to the other of the adjacent precast concrete blocks B. The fixed member 4 has a through-hole that allows the steel bar R to pass through and us shaped to correspond to the cross-sectional shape of the steel bar R.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lightning connector that is embedded in a precast concrete block containing a steel bar for lightning protection. [Background technology]

[0002] An example of such a lightning connector is described in Patent Document 1 ("Lightning Connector"). This is used between multiple precast concrete blocks stacked one on top of the other to electrically connect reinforcing bars (steel bars) embedded in the precast concrete blocks, allowing the current caused by a lightning strike on a structure to flow to the ground on which the structure is built.

[0003] The lightning connector described in Patent Document 1 comprises a base attached to a joint, a support member fixed to the base, and a contact member fixed to the support member. The contact member has a pair of clamping parts facing each other, and a tension member is connected to the clamping parts. The connector is configured so that the support member undergoes plastic deformation by pulling the tension member, and the clamping parts come into electrical contact with the reinforcing bar.

[0004] However, in order to ensure the electrical connection between the reinforcing bars and the joints, the structure of the lightning connector was a complex combination of a base, a support member, a contact member, and a tension member, and there was room for improvement in terms of manufacturing costs. However, simply simplifying the structure may make it difficult to achieve electrical connection between the steel bars. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5438562 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a lightning connector that has a simple structure yet can ensure reliable electrical connection between steel bars. [Means for solving the problem]

[0007] The present invention relates to a lightning connector that is embedded in a precast concrete block incorporating a steel bar capable of passing an electric current caused by a lightning strike, together with the steel bar, and is used to electrically connect each of the steel bars belonging to a plurality of the precast concrete blocks adjacent in the extension direction of the steel bar, wherein the steel bar has a spiral projection formed on its outer periphery, and at least one portion in the circumferential direction is formed with a surface extending in the extension direction of the steel bar, and the lightning connector has at least a portion that provides electrical conduction formed of a conductive material, and includes a bypass conductive portion that is disposed around the steel bar along the extension direction, and at least a portion that provides electrical conduction formed of a conductive material, and is arranged so as to be electrically connected to an end of the bypass conductive portion that is closer to the inside of the precast concrete block. the inner end installation member contacting the steel bar in such a manner as to contact the outer end of the precast concrete block, the fixing member having at least a portion which provides electrical conductivity made of a conductive material and which engages with the spiral protrusion of the steel bar to fix it in the extension direction and which contacts the portion of the inner end installation member which is made of a conductive material to provide electrical conductivity between the steel bar and the inner end installation member, and an outer end installation member having at least a portion which provides electrical conductivity made of a conductive material and which contacts the outer end of the precast concrete block in the bypass electrical connection portion and the steel bar belonging to the other adjacent precast concrete block so as to be electrically conductive, the fixing member being a lightning connection having a through hole through which the steel bar can pass and which has a shape corresponding to the cross-sectional shape of the steel bar.

[0008] According to this configuration, the through hole of the fixing member has a shape corresponding to the cross-sectional shape of the steel bar, so that fixing can be completed simply by inserting the fixing member into the steel bar until it hits the inner end installation member and rotating it circumferentially.

[0009] In addition, the bypass conductive portion can have an end face at the end in the extension direction, and the inner end installation member can be plate-shaped and have a main body and a protrusion protruding from the main body in the thickness direction and contacting the end face of the bypass conductive portion so as to be conductive.

[0010] According to this configuration, reliable conduction is possible by physically contacting the detour conductive portion with the protrusion.

[0011] Further, the surface of the steel bar is a plane, and two surfaces are provided at radially opposing positions, and the fixing member is provided with a plane corresponding portion having a portion parallel to the plane at a position facing the through hole and opposing the plane, and the plane corresponding portion located on one side in the radial direction is provided close to one side in the extension direction of the fixing member, and the plane corresponding portion located on the other side in the radial direction is provided close to the other side in the extension direction of the fixing member.

[0012] According to this configuration, the planar corresponding portions on one side and the other side are provided at different positions in the extension direction of the steel bar, so that the fixing member can be fixed to the inner end installation member while aligning it with the spiral protrusion of the steel bar and avoiding inclination.

[0013] In addition, the outer end installation member can have a first claw portion that engages with the bypass conductive portion to fix the outer end installation member to the bypass conductive portion and is conductive to the bypass conductive portion, and a second claw portion that is provided at a position separate from the first claw portion and is conductive to the steel bar by contacting the outer periphery of the steel bar.

[0014] According to this configuration, the combination of the first claw portion and the second claw portion allows electrical conduction between the bypass conductive portion and the steel bar via the outer end installation member.

[0015] Further, the surface of the steel bar is a flat surface and is provided at two radially opposing positions, the bypass conductive portion is cylindrical, multiple first claw portions are provided at even positions in the circumferential direction, multiple second claw portions are provided at unequal positions in the circumferential direction, at least one of the second claw portions contacts the flat surface located on one side in the radial direction and at least one of the second claw portions contacts the flat surface located on the other side in the radial direction, and the second claw portions that do not contact the flat surfaces contact the outer peripheral surface of the steel bar where the flat surfaces are not formed.

[0016] According to this configuration, reliable electrical continuity with the steel bar is possible through the multiple second claw portions. Effect of the Invention

[0017] According to the present invention, since the through hole of the fixing member has a shape corresponding to the cross-sectional shape of the steel bar, the fixing member can be inserted into the steel bar until it contacts the inner end installation member, and then fixed simply by rotating it in the circumferential direction. Therefore, it is possible to provide a lightning connector that can reliably connect the steel bars electrically, despite its simple structure. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2A is a vertical cross-sectional view showing the structure of a lightning connection body according to one embodiment of the present invention, and FIG. 2B is an explanatory diagram showing the electrical continuity state in the structure shown in FIG. [Diagram 2] FIG. 4 is a plan view of an inner end installation member that constitutes the lightning connection body. [Diagram 3] 4 is an enlarged side view (partially in cross section) of an inner end installation member that constitutes the lightning connection body. FIG. [Figure 4] FIG. 2 is a plan view of a fixing member constituting the lightning connection body (the correspondence with the steel bar is indicated by a two-dot chain line). [Diagram 5] FIG. [Figure 6] FIG. 2 is a plan view of an outer end installation member that constitutes the lightning connection body (the corresponding relationship with the steel bar and the bypass conductive portion is indicated by a two-dot chain line). [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] 10 is a plan view of the outer end installation member in a flat state before the first claw portion and the second claw portion are bent. FIG. [Figure 10] 13 is an explanatory side view showing a method of attaching a fixing member to a bypass conductive portion in which an inner end installation member is attached and a steel bar is passed in the lightning connection body. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The present invention will be described below with reference to an embodiment and drawings. The lightning connector 1 of this embodiment is embedded in a precast concrete block B (part of which is shown in Fig. 1 (A) (B)) that has multiple (a large number (several dozens)) steel bars R built in it, together with the steel bars R. Each precast concrete block B is, for example, rectangular. The multiple precast concrete blocks B are arranged in a structure such as a building by stacking them vertically (hereinafter, this arrangement state is referred to as an "arrangement example"). Therefore, each steel bar R is arranged along the vertical direction in the arrangement example. The steel bars R are made of steel and therefore conductive. Some of the multiple steel bars R (those shown in the figure) form part of the electrical conduction path from the lightning rod provided in the structure to the ground, and are configured to pass the current associated with a lightning strike and release it to the ground. The steel bars R that do not form part of the conduction path are used solely for strength. This lightning connector 1 belongs to vertically adjacent precast concrete blocks B and is used to electrically connect each of the steel bars R constituting part of the conductive path. In each precast concrete block B, a plurality of steel bars R protrude from the upper end face B1 in the arrangement example. Although the specific dimensions are not particularly limited, the steel bars R protrude from the upper end face B1 by, for example, about 300 mm. Furthermore, at the lower end face B2 in the arrangement example, the lower part of a cylindrical bypass conductive part 2 described later is exposed. Note that an outer end installation member 5 described later is attached so as to be exposed below the lower end face of each precast concrete block B.

[0020] The steel bar R used in the lightning connection 1 of this embodiment is a type of steel bar generally called a "deformed steel bar," and has a spiral projection R1 inclined with respect to the axial direction formed on its outer periphery, and a surface, specifically a flat surface R2, extending in the extension direction of the steel bar R is formed in at least one portion in the circumferential direction. In this embodiment, two flat surfaces R2 (a pair) are provided at positions opposite each other in the radial direction, and the cross-sectional shape of the steel bar R is approximately oval.

[0021] The lightning connection body 1 includes a detour conductive part 2, an inner end installation member 3, a fixing member 4, and an outer end installation member 5. The detour conductive part 2, the inner end installation member 3, and the fixing member 4 are each embedded in the precast concrete block B together with a steel bar R during the manufacturing process of the precast concrete block B. The fixing member 4 is also fixed to the steel bar R at this time. The outer end installation member 5 can be attached to the detour conductive part 2 at the construction site of the structure, or can be attached to the detour conductive part 2 during the manufacturing process of the precast concrete block B.

[0022] At least the portion of the bypass conductive part 2 that conducts the current is made of a conductive material, and is arranged around the steel bar R along the extension direction. The bypass conductive part 2 is also called a "joint" or a "mortar filling joint", and is a cylindrical body made entirely of metal, specifically, cast iron or other conductive material. As shown in Figs. 1(A) and 1(B), the bypass conductive part 2 is arranged around the entire circumference of the steel bar R embedded in the precast concrete block B and the steel bar R protruding from the upper end surface B1 of another precast concrete block B arranged below in the arrangement example, so as to surround the entire circumference along the axial direction. When the precast concrete blocks B, B are stacked vertically, the upper steel bar R and the lower steel bar R are not in contact with each other, and there is a gap between them. The upper steel bar R and the lower steel bar R are arranged so that the planes R2 face approximately in the same direction. The bypass conductive part 2 can be made of a general-purpose joint. Since the bypass conductive part 2 is a cylindrical body, it has end faces 21 at both ends in the extension direction. The end faces 21 are flat surfaces, and have conductive properties due to the exposed conductive material. In the lightning connector 1 of this embodiment, in the arrangement example, a continuous conductive path is formed from the upper end face 211 (with which the inner end installation member 3 contacts) through the inside of the cylindrical part to the lower inner peripheral surface 22 (with which the first claw portion 51 of the outer end installation member 5 engages). In this conductive path, a current flows when lightning strikes, as shown by the arrow C in FIG. 1(B). Inside the bypass conductive part 2, a protrusion is provided (not shown) for engaging with the end of the steel bar R for positioning. In addition, a resin (rubber, etc.) packing can be provided between the cylindrical body part and the steel bar R to prevent concrete from entering during the manufacture of the precast concrete block B. Incidentally, there is a space between the bypass conductive section 2 inside the precast concrete block B and the steel bar R when the precast concrete block B is manufactured in the factory, but at the construction site of the structure, the space is filled by injecting grout (mortar) into the space.

[0023] At least the portion of the inner end installation member 3 that provides electrical conduction is made of a conductive material. The inner end installation member 3 contacts the end portion of the precast concrete block B in the bypass conductive section 2 that is closer to the inside (closer to the upper side in the arrangement example) so as to provide electrical conduction. The inner end installation member 3 of this embodiment is entirely made of metal (specifically, made of steel material) and has a plate shape, more specifically, a flat hollow disk (ring) shape in a plan view as shown in FIG. 2. The diameter of the circular through hole 34 formed inside is larger than the maximum diameter of the steel bar R so as not to interfere with the steel bar R.

[0024] The inner end installation member 3 has a main body portion 31 (having a circular through hole 34 at the center) which is the flat hollow disk-shaped portion, a plurality of (six in this embodiment) inner protrusions 32 which protrude in the thickness direction from the main body portion 31 and contact the end face 21 (upper end face 211 in the arrangement example) of the detour conductive portion 2 so as to be conductive, and a plurality of (three in this embodiment) outer protrusions 33 which contact the fixed member 4 so as to be conductive. As shown in FIG. 3, the inner protrusions 32 and the outer protrusions 33 protrude in opposite directions in the thickness direction of the inner end installation member 3. Each of the multiple inner protrusions 32 is at the same position in the radial direction and is provided at equal intervals in the circumferential direction. The outer protrusions 33 are similar. By arranging them in this manner, the conductive state in the circumferential direction can be made uniform. By contacting the inner protrusions 32 with the detour conductive portion 2 (end face 21) and the outer protrusions 33 with the fixed member 4, contact is made between surfaces and points, so that more reliable conduction is possible compared to contact between surfaces (where the contact area is unstable). In this embodiment, each protrusion is integral with the main body 31 (formed by press working or the like), but may be formed by attaching a separate part (rivet or the like) made of a conductive material to the main body 31.

[0025] At least the portion of the fixing member 4 that provides electrical conduction is made of a conductive material. The fixing member 4 in this embodiment is entirely made of metal (specifically, steel material) and is a plate-like body composed of a plate-like main body 41 and a folded portion 42 in which a part of the main body 41 is folded back so as to overlap in the thickness direction as shown in Figs. 4 and 5. As shown in Fig. 10, the fixing member 4 is fixed to the steel bar R in the extension direction by engaging with a spiral projection R1 on the steel bar R. At the same time, the fixing member 4 contacts the inner end installation member 3 to provide electrical conduction between the steel bar R and the inner end installation member 3. The fixing member 4 has a through hole 43 that is formed to penetrate the main body 41 and through which the steel bar R can pass. The fixing member 4 is a "nut"-like member in which the helical protrusion R1 formed on the outer periphery of the steel bar R serves as a "thread" and the steel bar R is passed through the through hole 43. When the fixing member 4 is rotated circumferentially as indicated by arrow M in Figure 10, which shows the state during installation, the fixing member 4 is guided by the helical protrusion R1 and screwed in, as indicated by arrow M in Figure 10.

[0026] The through hole 43 has a shape corresponding to the cross-sectional shape of the steel bar R (shown by a two-dot chain line) as shown in FIG. 4. The through hole 43 has a shape similar to the cross-sectional shape of the part of the steel bar R where the protrusion R1 is formed, and is formed slightly larger. The through hole 43 faces a space extending in the thickness direction of the main body 41, and at positions facing a pair of planes R2, R2 provided on the steel bar R, plane corresponding parts 44 having parts parallel to each plane R2 are provided. The plane corresponding parts 44 are provided on one side and the other side facing each other in the radial direction. The inner edge shape of the plane corresponding parts 44 is partially circular as shown in FIG. 4. This is to make it easier to align the plane corresponding portion 44 with the groove-like portion recessed radially inward between the spiral projections R1, R1 aligned along the axial direction of the steel bar R when the fixing member 4 is rotated in the circumferential direction (arrow M in FIG. 10) relative to the steel bar R to bring the fixing member 4 into contact with the inner end installation member 3 during the manufacturing process of the precast concrete block B. As shown in FIG. 5, the plane corresponding portion 441 located on one side in the radial direction is provided close to one side in the extension direction of the fixing member 4 (for example, the lower side in the arrangement example). And the plane corresponding portion 442 located on the other side in the radial direction is provided close to the other side in the extension direction of the fixing member 4 (for example, the upper side in the arrangement example). In this way, the planar corresponding portions 441, 442 on one side and the other side are provided at different positions in the extension direction of the steel bar R (different positions above and below in the arrangement example), so that the fixing member 4 can be fixed to the inner end installation member 3 while avoiding tilting, by aligning it with the spiral protrusion R1 (and the groove-like portion between the protrusions R1, R1) of the steel bar R, which is formed so as to shift sequentially in the vertical direction.

[0027] At least the portion of the outer end installation member 5 that conducts electricity is made of a conductive material. The outer end installation member 5 contacts the end of the bypass conductive portion 2 near the outside of the precast concrete block B (in the arrangement example, near the lower side of the upper precast concrete block B) and the steel bar R belonging to another adjacent precast concrete block B so as to conduct electricity. For each of the above contacts, the outer end installation member 5 has a first claw portion 51 and a second claw portion 52. The outer end installation member 5 of this embodiment is entirely made of metal (specifically, made of steel material) and has a plate shape, more specifically, a flat hollow disk (ring) shape in plan view as shown in FIG. 6, except for the first claw portion 51 and the second claw portion 52. Note that FIG. 6 is a plan view of the arrangement example when viewed from above. The diameter dimension of the circular through hole 53 formed inside is larger than the maximum diameter dimension of the steel bar R, so as not to interfere with the steel bar R. The diameter of the circular through hole 53 is smaller than the diameter of the inner peripheral surface 22 at the lower part in the arrangement example of the detour conductive portion 2. As shown in Figs. 6 to 8, the first claw portion 51 and the second claw portion 52 are provided inside the circular through hole 53. The first claw portion 51 extends from the inner edge of the circular through hole 53 along the penetrating direction of the circular through hole 53. The first claw portion 51 is formed with a conductive protrusion 511 protruding radially outward. The conductive protrusion 511 abuts against the inner peripheral surface 22 (a step portion not shown) of the detour conductive portion 2 to provide electrical continuity between the detour conductive portion 2 and the outer end installation member 5.

[0028] The first claw portion 51 engages with the inner peripheral surface 22 of the detour conductive portion 2 to fix the outer end installation member 5 to the detour conductive portion 2 and to provide electrical conductivity to the detour conductive portion 2. As shown in Figs. 6 and 9, the second claw portion 52 is provided at a different position in the circumferential direction from the first claw portion 51 and is in contact with the outer peripheral portion of the steel bar R to provide electrical conductivity to the steel bar R. The combination of the first claw portion 51 providing electrical conductivity on the detour conductive portion 2 side and the second claw portion 52 providing electrical conductivity on the steel bar R side provides electrical conductivity between the detour conductive portion 2 and the steel bar R via the outer end installation member 5. The first claw portion 51 and the second claw portion 52 are each formed into a substantially rectangular shape when viewed in the thickness direction, and the leading edge is formed into a straight line shape.

[0029] A plurality of first claws 51 (three in this embodiment) are provided at equal positions in the circumferential direction. A plurality of second claws 52 (three in this embodiment) are provided at unequal positions in the circumferential direction, as shown in FIG. 9. FIG. 9 shows the flat shape of each of the claws 51, 52 before being bent. As shown in FIG. 6, at least one of the second claws 52 contacts the plane R2 located on one side in the radial direction of the steel bar R, and at least one of the second claws 52 contacts the plane R2 located on the other side in the radial direction. Since the tip edge of the second claws 52 has a straight shape as described above, a stable electrical connection can be achieved by contacting the plane R2 of the steel bar R. The second claws 52 that do not contact the plane R2 contact the outer circumferential surface of the steel bar R where the plane R2 is not formed. In this manner, the multiple second claw portions 52 contact the steel bar R separately on the flat surface R2 and on the other outer peripheral surface, so that reliable electrical conduction with the steel bar R is possible through the multiple second claw portions 52.

[0030] A substantially semicircular first alignment recess 54 and a substantially triangular second alignment recess 55 are provided on the outer periphery of the outer end installation member 5. The first alignment recess 54 is provided in three locations at 120 degree intervals and is used for alignment when processing the outer end installation member 5. The second alignment recess 55 is provided in two locations at 180 degree intervals and is used for alignment with the bypass conductive portion 2.

[0031] In the lightning connection body 1 configured as above, since the through hole of the fixing member 4 has a shape corresponding to the cross-sectional shape of the steel bar R, the fixing member 4 can be inserted into the steel bar R until it hits the inner end installation member 3, and then simply rotated in the circumferential direction to complete the fixing. Therefore, this lightning connection body 1 can reliably achieve electrical connection (conduction) between the steel bars R, R built into adjacent precast concrete blocks B, B, despite its simple configuration. In addition, in this embodiment, as multiple precast concrete blocks B are stacked vertically at the construction site of the structure, electrical connection between the steel bars R that should be conductive can be performed. Therefore, compared to the conventional case in which the steel bars R are connected to each other by a conductor, this is advantageous in that work by an electrical worker or so-called matching work (the presence of an electrical worker during the work of the construction workers) is not required.

[0032] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the present invention.

[0033] For example, the constituent members of the lightning connection unit 1 only need to be made of a conductive material at least in the portion that provides electrical conduction, and may be, for example, a combination of resin and metal.

[0034] In the above embodiment, the fixing member 4 is formed by bending a plate-like body, but is not limited to this, and may be formed in a block shape with a constant thickness, for example, like a general nut. [Explanation of symbols]

[0035] 1 Lightning connector 2 Detour Conduction Section 21 End face 211 Upper end surface 22 Inner surface 3. Inner end installation member 31 Main body 32 Medial protrusion 33 Lateral process 4 Fixing member 41 Main body 42 Bend part 43 Through hole 44 Flat surface counterpart 441 One side flat corresponding part 442 Other side flat surface corresponding part 5 Outer end installation member 51 1st claw part 511 Conductive protrusion 52 2nd claw part 53 Circular through hole B. Precast concrete block B1 Top surface B2 Lower end surface R steel bar R1 protrusion R2 plane C Continuity M Moving direction of fixed part

Claims

1. A lightning connector is embedded in a precast concrete block containing a steel bar capable of passing an electric current caused by a lightning strike, together with the steel bar, and is used to electrically connect each of the steel bars belonging to a plurality of the precast concrete blocks adjacent in the extension direction of the steel bar, The steel bar has a spiral protrusion formed on an outer periphery, and a surface extending in an extension direction of the steel bar is formed in at least one portion in a circumferential direction, The lightning connector comprises: At least a portion that provides electrical conduction is made of a conductive material, and a bypass conductive portion is disposed around the steel bar along the extension direction; an inner end installation member, at least a portion of which is electrically conductive and which is made of a conductive material and which is in electrically conductive contact with an end portion of the bypass conductive portion that is closer to the inside of the precast concrete block; a fixing member, at least a portion which provides electrical continuity being made of a conductive material, which engages with the spiral protrusion of the steel bar to fix the steel bar in the extension direction, and which contacts a portion of the inner end installation member which is made of a conductive material to provide electrical continuity between the steel bar and the inner end installation member; The concrete block is then fitted with a precast concrete block casing and is then fitted with a precast concrete block casing. The precast concrete block casing is then fitted with a precast concrete block casing. Equipped with The fixing member is a lightning connector having a through hole through which the steel bar can pass and a shape corresponding to the cross-sectional shape of the steel bar.

2. the bypass conductive portion has an end surface at an end in the extension direction, The lightning connection body as described in claim 1, wherein the inner end installation member is plate-shaped and has a main body and a protrusion protruding from the main body in the thickness direction and in contact with the end face of the bypass conductive portion so as to be conductive.

3. The surface of the steel bar is a flat surface, and two surfaces are provided at positions opposite each other in the radial direction, the fixing member is provided with a plane corresponding portion having a portion parallel to the plane at a position facing the through hole and opposite the plane, The flat surface corresponding portion located on one side in the radial direction is provided toward one side in the extension direction of the fixing member, 3. The lightning connection according to claim 1, wherein the flat surface corresponding portion located on the other side in the radial direction is provided closer to the other side in the extension direction of the fixing member.

4. The outer end installation member is a first claw portion that engages with the bypass conductive portion to fix the outer end installation member to the bypass conductive portion and to be electrically connected to the bypass conductive portion; A second claw portion is provided at a position different from the first claw portion and is electrically connected to the steel bar by contacting an outer periphery of the steel bar; The lightning connector according to claim 1 or 2, comprising:

5. The surface of the steel bar is a flat surface, and two surfaces are provided at positions opposite each other in the radial direction, The bypass conductive portion is cylindrical, The first claw portion is provided in a plurality of positions evenly spaced in the circumferential direction, The second claw portion is provided in a plurality of positions that are uneven in the circumferential direction, At least one of the second claw portions contacts the flat surface located on one side in the radial direction, At least one of the second claw portions contacts the flat surface located on the other side in the radial direction, The lightning connection body according to claim 4 , wherein the second claw portions that do not contact the flat surface contact an outer peripheral surface of the steel bar on which the flat surface is not formed.

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