Grounding electrode

Abstract

To provide a grounding pole pile capable of connecting an electric conductor to a pile body before driving the pointed end and the pile body into the ground. [Solution] The pile comprises a pile body 1, a pointed end 2 fixed to one end face of the pile body 1, a terminal plate 3 having a main body plate 15 and a protruding plate piece 16 protruding from the outer surface of the main body plate 15, a head 4 having a large-diameter cylindrical portion 25 and a small-diameter cylindrical portion, and an electrical conductor 5. The terminal plate 3 is fixed to the pile body 1 by abutting the back surface of the main body plate 15 against the other end face of the pile body 1. The head 4 is fixed to the main body plate 15 by abutting one end face 25 of the large-diameter cylindrical portion 25 against the surface of the main body plate 15. The electrical conductor 5 is inserted into a conductor insertion hole 18 in the protruding plate piece 16 and fixed to the protruding plate piece 16 by crimping a portion of the protruding plate piece 16 between the crimping groove 19 and the conductor insertion hole 18.

Description

[Technical Field]

[0001] This invention relates to a grounding pole pile for grounding electrical systems such as electrical equipment. [Background technology]

[0002] Patent Document 1 discloses a grounding electrode as a technology for grounding electrical equipment, etc. The grounding electrode includes a round bar grounding pole, a lead terminal, and a lead wire. The grounding pole has a connection hole. The connection hole is formed at the rear end of the grounding pole and opens at the rear end face of the grounding pole. The lead terminal is fixed to the tip side of the lead wire. The grounding pole is driven into the ground by striking the rear end face. After the grounding pole is driven into the ground, the lead terminal is inserted into the connection hole from the rear end face of the grounding pole to connect the lead wire to the grounding pole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-48023 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, after the grounding electrode pile is driven into the ground, the lead terminal must be inserted into the connection hole of the grounding electrode pile to connect the lead wire to the grounding electrode pile.

[0005] The present invention provides a grounding pole pile in which an electrical conductor can be connected to the pile body before the point and pile body are driven into the ground. [Means for solving the problem]

[0006] Claim 1 of the present invention relates to a pile body comprising: a cylindrical pile body made of conductive metal; a pointed end portion made of conductive metal that abuts against one pile end surface of the pile body and is fixed to the pile body; a terminal plate body made of conductive metal in a flat plate shape and having a main body plate and a protruding plate piece protruding from the outer surface of the main body plate; a cylindrical head portion made of conductive metal that has a large-diameter cylindrical portion and a small-diameter cylindrical portion protruding from one column end of the large-diameter cylindrical portion; and an electric conductor made of conductive metal, wherein the main body plate has a circular hole that penetrates the main body plate in the plate thickness direction of the terminal plate body and opens on the plate front and back surface of the main body plate, and the protruding plate piece has a conductor insertion hole that penetrates the protruding plate piece in the plate thickness direction of the terminal plate body and opens on the plate front and back surface of the protruding plate piece, the body is fixed to the pile body by having the main body plate and the protruding plate piece protruding from the outer peripheral surface of the pile body in the radial direction of the pile body, the back surface of the main body plate abutting against the other end surface of the pile body, the head portion having the small-diameter cylindrical portion penetrating from the surface of the main body plate into the circular hole and protruding into the inner peripheral hole of the pile body on the other end surface side of the pile body, and one column end face of the large-diameter cylindrical portion abutting against the surface of the main body plate to be fixed to the main plate, the electrical conductor being inserted into the wire insertion hole and one end side of the electrical conductor protruding from the wire insertion hole toward the large-diameter cylindrical portion and being placed on the protruding plate piece, and being fixed to the protruding plate piece by crimping a part of the protruding plate piece.

[0007] Claim 2 of the present invention is the grounding electrode pile described in claim 1, characterized in that the protruding plate piece has a crimping groove, which is formed in the protruding plate piece between the protruding end face of the protruding plate piece and the conductor insertion hole, and which has a groove depth from the protruding end face toward the conductor insertion hole, opens on the protruding end face, penetrates the protruding plate piece in the plate thickness direction of the terminal plate body, and opens on the front and back surfaces of the protruding plate piece, and the electrical conductor is fixed to the protruding plate piece by crimping the protruding plate piece between the crimping groove and the conductor insertion hole into which the electrical conductor is inserted. [Effects of the Invention]

[0008] In this device, the electrical conductor is inserted into the conductor insertion hole of the protruding plate and fixed to the protruding plate by crimping part of the protruding plate, and the electrical conductor is electrically connected to the pile body through the protruding plate and the main plate. After the electrical conductor is fixed to the protruding plate, the large-diameter cylindrical part is struck to drive the tip and the pile body into the ground. According to the present invention, before the tip and the pile body are driven into the ground, the electrical conductor can be fixed to the protruding plate piece, and the electrical conductor can be electrically connected to the pile body through the protruding plate piece and the main plate. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a front perspective view of a grounding pole according to the present invention; FIG. [Figure 2] FIG. 2 is a left side view showing the grounding pole pile according to the present invention. [Figure 3] 1 is an enlarged plan view showing a grounding pole pile according to the present invention; [Figure 4] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 5] FIG. 2 is an enlarged view of a portion of FIG. [Figure 6] FIG. 3 is a partially enlarged view of FIG. 2. [Figure 7] FIG. 5 is an enlarged view of part B in FIG. [Figure 8] FIG. 5 is an enlarged view of part C in FIG. [Figure 9] 10 is an enlarged plan view of the protruding plate piece after the crimping groove of the protruding plate piece has been struck to crimp a portion of the protruding plate piece and fix the electrical conductor to the protruding plate piece. FIG. [Figure 10] This is a left side view of the grounding pole and the earth wire connected together. [Figure 11] This is a diagram showing the tip and pile body being driven into the soil layer below the concave bottom of the hole. [Figure 12] This is a diagram showing the recessed hole being backfilled and the tip, pile body, terminal plate body, head, and one end of the electrical conductor being buried in the ground. DETAILED DESCRIPTION OF THE INVENTION

[0010] The grounding pole pile according to the present invention will be described with reference to FIGS. 1 to 12. FIG.

[0011] 1 to 12, the grounding electrode pile X is made of a conductive metal, such as carbon steel, iron, etc. The grounding electrode pile X includes a pile body 1, a tip 2, a terminal plate body 3, a head 4, and an electrical conductor 5.

[0012] As shown in Figures 1, 2, and 4 to 8, the pile body 1 is formed into a cylindrical shape from a conductive metal. The pile body 1 is formed into a cylindrical shape from, for example, carbon steel, iron, or the like. The pile body 1 has a pile length L1 between the pile end faces 1A, 1B of the pile body 1 in the direction A of the cylindrical center line a of the pile body 1 (pile length direction A). The pile body 1 has a cylindrical portion 11 (cylindrical pipe) and hollow truncated cone portions 12A, 12B (frustum cone pipes).

[0013] As shown in Figures 1, 2, and 4 to 7, the cylindrical portion 11 is formed as a circular pipe (cylindrical pipe) with an outer diameter D1 (outer diameter) and an inner diameter d1 (inner diameter). The cylindrical portion 11 is arranged (formed) on the pile end face 1B side of the pile main body 1 (the other pile end face 1B side of the pile main body 1) in the direction A (pile length direction A) of the cylinder center line a of the pile main body 1. As shown in Figure 4, the cylindrical portion 11 has a cylindrical pipe length L2 between the cylinder end faces 11A, 11B of the cylindrical portion 11, which is shorter than the pile length L1 of the pile main body 1. The cylinder end face 11B (the other cylinder end face 11B) of the cylindrical portion 11 is the pile end face 1B of the pile main body 1 (the other pile end face 1B).

[0014] The truncated cone portion 12A (one of the truncated cone portions) is arranged concentrically with the cylindrical portion 11, as shown in Figures 1, 2, 4, and 8. The truncated cone portion 12A is arranged (formed) between one of the cylindrical end surfaces 11A of the cylindrical portion 11 and one of the pile end surfaces 1A of the pile main body 1, while gradually reducing in diameter from one of the cylindrical end surfaces 11A of the cylindrical portion 11 toward the pile end surface 1A of the pile main body 1 (one of the pile end surfaces 1A) in the direction A of the cylindrical center line a of the pile main body 1 (the pile length direction A).

[0015] The truncated cone portion 12B (the other truncated cone portion) is arranged concentrically with the cylindrical portion 11, as shown in Figures 1, 4, and 7. The truncated cone portion 12B is arranged (formed) between the other cylindrical end surface 11B of the cylindrical portion 11 and the other pile end surface 1B of the pile main body 1, while gradually reducing in diameter from the other cylindrical end surface 11B of the cylindrical portion 11 toward the pile end surface 1B of the pile main body 1 (the other pile end surface 1B) in the direction A of the cylindrical center line of the pile main body 1.

[0016] The tip 2 is made of a conductive metal. The tip 2 is made of, for example, carbon steel, iron, or the like. As shown in Figures 1, 2, 4, and 8, the tip 2 abuts against one pile end surface 1A (the tip surface of the truncated cone portion 12A) of the pile main body 1 and is fixed to the pile main body 1. As shown in Figure 8, the tip 2 has a conical portion 13 and a shank 14 (cylindrical shank). As shown in Figure 8, the shank 14 is arranged concentrically with the conical portion 13. The shank 14 has a diameter reduced from the bottom surface 13A of the conical portion 13 and protrudes from the bottom surface 13A of the conical portion 13.

[0017] As shown in Figures 4 and 8, the tip 2 is arranged on the pile body 1 (one pile end face 1A of the pile body 1) by inserting the shank 14 into the pile body 1 (into the truncated cone portion 12A) from one pile end face 1A of the pile body 1. The tip 2 is fixed to the pile body 1 (one pile end face 1A side of the pile body 1) by inserting the shank 14 into the pile body 1 (into the truncated cone portion 12A) and abutting the bottom surface 13A of the conical portion 13 against the one pile end face 1A of the pile body 1. The tip 2 is fixed to the pile body 1 (one pile end face 1A side of the pile body 1) by, for example, welding (metal welding). The tip 2 is electrically fixed to the pile body 1 by welding the conical portion 13 abutting against the one pile end face 1A of the pile body 1 and the one pile end face 1A side of the pile body 1 around the entire circumference of the pile body 1.

[0018] The terminal plate body 3 is formed in a flat plate shape from a conductive metal. The terminal plate body 3 is formed in a flat plate shape from carbon steel, iron, or the like. As shown in Figures 1 to 7, the terminal plate body 3 has a main body plate 15 (terminal plate) and a protruding plate piece 16 (protruding terminal plate piece). The terminal plate body 3 (main body plate 15 and protruding plate piece 16) is formed in a flat plate shape with a plate thickness T1. The tip 2 is electrically connected to the pile body 1.

[0019] 1 to 7, the main body plate 15 is formed, for example, in a circular shape (circular flat plate). The main body plate 15 has an outer circumferential diameter D2 that is larger than the maximum outer circumferential diameter D1 (the outer circumferential diameter D1 of the cylindrical portion 11) of the pile main body 1. The main body plate 15 has a plate front surface 15A and a plate back surface 15B in the plate thickness direction T of the terminal plate body 3 (main body plate 15).

[0020] As shown in FIG. 7, the main body plate 15 has a circular hole 17 (post insertion hole). The circular hole 17 has a hole diameter d3 smaller than the outer diameter D2 of the main body plate 15. The hole diameter d3 (inner diameter) of the circular hole 17 is smaller than the minimum outer diameter Dα of the truncated cone portion 12B (the outer diameter of the other pile end face 1B of the pile main body 1) and larger than the minimum inner diameter dα of the truncated cone portion 12B (the inner diameter d1 of the other pile end face 1B of the pile main body 1). The circular hole 17 has a hole diameter d3 that is approximately the same as the inner diameter dα of the truncated cone portion 12B. The circular hole 17 is arranged concentrically with the main body plate 15 (circular main body plate). The circular hole 17 penetrates the main body plate 15 in the plate thickness direction T of the terminal plate 3 (main body plate 15) and opens to the plate surface 15A and the plate back surface 15B of the main body plate 15.

[0021] As shown in Figures 1 to 3, 5 and 6, the protruding plate piece 16 has the same plate thickness T1 as the main plate 15 in the plate thickness direction T of the terminal plate 3, and is formed on the main plate 15. The protruding plate piece 16 has a plate surface 16A and a plate back surface 16B in the plate thickness direction T of the terminal plate 3 (protruding plate piece 16). The protruding plate piece 16 protrudes from an outer surface 15C of the main plate 15 (protrudes outward from the outer surface 15C) and is fixed to the main plate 15. As shown in Figure 3, the protruding plate piece 16 has a protruding length LA (plate length) in the radial direction of the main plate 15 (circular hole 17), and protrudes from the outer surface 15C (outer peripheral surface) of the main plate 15 (protrudes outward from the main plate 15). The protruding plate piece 16 protrudes from the outer surface 15C of the main body plate 15, with the plate surface 16A positioned flush with the plate surface 15A of the main body plate 15 and the plate back surface 16B positioned flush with the plate back surface 15B of the main body plate 15. As shown in Figure 3, the protruding plate piece 16 has a plate width HA in the circumferential direction of the main body plate 15 and protrudes from the outer surface 15C of the main body plate 15.

[0022] As shown in Figures 1, 3, 5 and 6, the protruding plate piece 16 has a conductor insertion hole 18 and a crimping groove 19. As shown in Figure 3, the conductor insertion hole 18 is disposed on the protruding end face 16C side of the protruding plate piece 16, spaced apart from the outer surface 15C of the main plate 15 in the radial direction of the terminal plate 3 (protruding plate piece 15), and spaced apart from the protruding end face 16C of the protruding plate piece 16 that protrudes from the outer surface 15C of the main plate 15. The conductor insertion hole 18 is disposed at the center of the plate width of the protruding plate piece 16. The conductor insertion hole 18 penetrates the protruding plate piece 16 in the plate thickness direction T of the terminal plate 3 (protruding plate piece 16) and opens to the plate surface 16A and the plate back surface 16B of the protruding plate piece 16.

[0023] As shown in Figures 1, 3 and 5, the crimping groove 19 is formed on the protruding end face 16C side of the protruding plate piece 16. The crimping groove 19 is formed in the protruding plate piece 16 between the protruding end face 16C of the protruding plate piece 16 and the conductor insertion hole 18. The crimping groove 19 is arranged at the center of the plate width of the protruding plate piece 16. As shown in Figure 3, the crimping groove 19 has a groove depth dA from the protruding end face 16C of the protruding plate piece 16 toward the conductor insertion hole 18, and is opened in the protruding end face 16C of the protruding plate piece 16. The crimping groove 19 penetrates the protruding plate piece 16 in the plate thickness direction T of the terminal plate 3 (protruding plate piece 16) and opens in the plate surface 16A and the plate back surface 15B of the protruding plate piece 16.

[0024] The head 4 is formed into a cylindrical shape from a conductive metal. The head 4 is formed into a cylindrical shape from carbon steel, iron, etc. As shown in Figures 1 to 7, the head 4 has a large-diameter cylindrical portion 25 and a small-diameter cylindrical portion 26.

[0025] As shown in Fig. 7, the large-diameter cylindrical portion 25 has an outer peripheral diameter D4 that is smaller than the outer peripheral diameter D2 of the main body plate 15. The outer peripheral diameter D4 is equal to or smaller than the minimum outer peripheral diameter Dα of the truncated cone portion 12B (the outer peripheral diameter of the other pile end face 1B of the pile main body 1). The large-diameter cylindrical portion 25 has an outer peripheral diameter D4 (cylinder diameter) that exceeds the minimum inner peripheral diameter dα of the truncated cone portion 12B (the inner peripheral diameter of the other pile end face 1B of the pile main body 1).

[0026] The small-diameter cylindrical portion 26 protrudes from one columnar end face 25A of the large-diameter cylindrical portion 25. As shown in FIG. 7, the small-diameter cylindrical portion 26 is arranged concentrically with the large-diameter cylindrical portion 25. The small-diameter cylindrical portion 26 has a diameter reduced from one columnar end face 25A of the large-diameter cylindrical portion 25 and protrudes from the large-diameter cylindrical portion 25 (one columnar end face 25A). The small-diameter cylindrical portion 26 has a column diameter D5 that is approximately the same as the hole diameter d3 (inner peripheral diameter) of the circular hole 17 and the smallest inner peripheral diameter dα of the truncated cone portion 12B, or a column diameter D5 (small-diameter column diameter) that is smaller than the hole diameter d3 (inner peripheral diameter) of the circular hole 17 and the smallest inner peripheral diameter d1α of the truncated cone portion 12B.

[0027] As shown in Fig. 7, the terminal plate 3 is arranged so that the circular hole 17 (main body plate 15) of the main body plate 15 is concentric with the inner peripheral hole 1C (inner peripheral hole 1C of the truncated cone portion 12B) of the pile main body 1. As shown in Figs. 1 to 7, the terminal plate 3 is arranged on the other pile end face 1B of the pile main body 1 (frustum cone portion 12B) with the main body plate 15 (on the outer surface 15C side of the main body plate 15) and the protruding plate piece 16 protruding from the outer peripheral surface 1a of the pile main body 1 [the outer peripheral surface 1a of the cylindrical portion 11 (frustum cone portion 12B)] in the radial direction of the pile main body 1. The terminal plate 3 is fixed to the pile main body 1 by abutting the back surface 15B of the main body plate 15 against the other pile end face 1B of the pile main body 1 (frustum cone portion 12B). The terminal plate body 3 is fixed to the pile body 1 by facing the back surface 16B of the protruding plate piece 16 toward one pile end surface 1A of the pile body 1 and abutting the back surface 15B of the main body plate 15 against the other pile end surface 1B of the pile body 1 (conical truncated portion 12B).

[0028] As shown in Figure 7, the head 4 is arranged so that the small-diameter cylindrical portion 26 penetrates from the plate surface 15A of the main body plate 15 into the circular hole 17, and the small-diameter cylindrical portion 26 protrudes into the inner hole 1C of the pile main body 1 (the inner hole 1C of the truncated cone portion 12B) on the other pile end face 1B side of the pile main body 1. The head 4 is fixed to the main body plate 15 by abutting one column end face 25A of the large-diameter cylindrical portion 25 against the plate surface 15A of the main body plate 15. The head 4 is fixed to the main body plate 15 by abutting one column end face 25A of the large-diameter cylindrical portion 25 against the plate surface 15A of the main body plate 15 while inserting the small-diameter cylindrical portion 26 into the circular hole 17 and the inner hole 1C of the pile main body 1.

[0029] The terminal plate 3 (main body plate 15) is fixed to the pile main body 1 by, for example, welding (metal welding). With the small-diameter cylindrical portion 26 (head portion 4) inserted into the circular hole 17 and the inner peripheral hole 1C, the terminal plate 3 (main body plate 15) is electrically fixed to the pile main body 1 by welding the main body plate 15 (plate back surface 15B) that abuts against the other pile end face 1B of the pile main body 1 and the other pile end face 1B side of the pile main body 1 around the entire circumference of the pile main body 1. By forming a bead (weld bead) between the outer surface 15C of the main body plate 15 and the outer peripheral surface 1a of the pile main body 1 (frustum conical portion 12B) by welding around the entire circumference of the pile main body 1, the main body plate 15 can be fixed to the pile main body 1 (frustum conical portion 12B), thereby preventing the bead (weld bead) from blocking the conductor insertion hole 18.

[0030] The head portion 4 (large diameter cylindrical portion 25) is fixed to the main body plate 15 (terminal plate 3) by, for example, welding (metal welding). With the small diameter cylindrical portion 26 inserted into the circular hole 17 and the inner peripheral hole 1C, the head portion 4 (large diameter cylindrical portion 25) is electrically fixed to the main body plate 15 (terminal plate 3) by welding the large diameter cylindrical portion 25 (one column end face 25A side of the large diameter cylindrical portion 25) that abuts against the plate surface 15A of the main body plate 15 and the main body plate 15 (plate surface 15A) around the entire circumference of the pile main body 1 (large diameter cylindrical portion 25). The head 4 (large diameter cylindrical portion 25) is fixed to the terminal plate 3 (main body plate 15) by welding a bead (weld bead) between the outer surface 25a of the large diameter cylindrical portion 25 and the outer surface 15C of the main body plate 15 around the entire circumference of the pile main body 1 (large diameter cylindrical portion 25), thereby preventing the bead (weld bead) from blocking the wire insertion hole 18.

[0031] The electrical conductor 5 is made of a conductive metal. For example, the electrical conductor 5 is a bare copper twisted wire formed by twisting multiple copper wires. As shown in Figures 1, 3, 5, and 6, the electrical conductor 5 is inserted into the conductor insertion hole 18, and one wire end 5A of the electrical conductor 5 protrudes from the conductor insertion hole 18 toward the large-diameter cylindrical portion 25 and is disposed in the protruding plate piece 16 (terminal plate 3).

[0032] 1 to 3, 5, 6 and 9, the electrical conductor 5 is fixed to the protruding plate piece 16. The electrical conductor 5 is fixed to the protruding plate piece 16 by crimping a portion of the protruding plate piece 16. The electrical conductor 5 is fixed to the protruding plate piece 16 by crimping the protruding plate piece 16 (a portion of the protruding plate piece 16) between the crimping groove 19 and the conductor insertion hole 18 into which the electrical conductor 5 is inserted. 9, the electrical conductor 5 is fixed to the protruding plate piece 16 by striking the groove inner surface 19A of the crimping groove 19 and applying a striking force f (pressing force f) from the groove inner surface 19A of the crimping groove 19 toward the center line a of the pile main body 1 (cylindrical portion 11) [hole center line a of the circular hole 17, plate center line a of the main body plate 15] to crimp a part of the protruding plate piece 16 (the protruding plate piece 16 between the crimping groove 19 and the conductor insertion hole 18 into which the electrical conductor 5 is inserted). The electrical conductor 5 is electrically connected to the pile main body 1 via the terminal plate 3 (main body plate 15 and protruding plate piece 16).

[0033] 9, the electrical conductor 5 may be fixed to the protruding plate piece 16 by, for example, crimping the protruding plate piece 16 (a part of the protruding plate piece 16) between one widthwise side surface 16D of the protruding plate piece 16 in the plate width direction and the conductor insertion hole 18 into which the electrical conductor 5 is inserted. The electrical conductor 5 is fixed to the protruding plate piece 16 by striking one widthwise side surface 16D of the protruding plate piece 16 and applying a striking force f (pressing force f) from one widthwise side surface 16D toward the other widthwise side surface 16E of the protruding plate piece 16 in the plate width direction, thereby crimping the protruding plate piece 16 (a part of the protruding plate piece 16) between one widthwise side surface 16D and the conductor insertion hole 18 into which the electrical conductor 5 is inserted.

[0034] As shown in Figures 1 to 3, 5, 6, and 9, the electrical conductor 5 is fixed to the protruding plate piece 16 by plastically deforming a portion of the protruding plate piece 16. The electrical conductor 5 is fixed to the protruding plate piece 16 by plastically deforming the protruding plate piece 16 (a portion of the protruding plate piece 16) between the crimping groove 19 and the conductor insertion hole 18 into which the electrical conductor 5 is inserted. The electrical conductor 5 is fixed to the protruding plate piece 16 by striking the inner groove surface 19A of the crimping groove 19 and applying a striking force f (pressing force f) from the inner groove surface 19A of the crimping groove 19 toward the center line a of the pile main body 1 (cylindrical portion 11) [the hole center line a of the circular hole 17, the plate center line a of the main body plate 15], thereby plastically deforming a portion of the protruding plate piece 16 (the protruding plate piece 16 between the crimping groove 19 and the conductor insertion hole 18 into which the electrical conductor 5 is inserted).

[0035] 9, the electrical conductor 5 may be fixed to the protruding plate piece 16 by, for example, plastically deforming the protruding plate piece 16 (a part of the protruding plate piece 16) between one widthwise side surface 16D of the protruding plate piece 16 in the plate width direction and the conductor insertion hole 18 into which the electrical conductor 5 is inserted. The electrical conductor 5 is fixed to the protruding plate piece 16 by striking one widthwise side surface 16D of the protruding plate piece 16 and applying a striking force f (pressing force f) from one widthwise side surface 16D toward the other widthwise side surface 16E of the protruding plate piece 16, thereby plastically deforming the protruding plate piece 16 (a part of the protruding plate piece 16) between one widthwise side surface 16D and the conductor insertion hole 18 into which the electrical conductor 5 is inserted.

[0036] 10, the grounding pole X includes a crimping ring 71 and an earth wire 72. The grounding pole X connects (electrically connects) the other wire end 5B of the electrical conductor 5 to the earth wire 72.

[0037] As shown in FIG. 10, the crimping ring 71 is made of a conductive metal and has a tubular shape (metallic tube).

[0038] As shown in Fig. 10, the earth wire 72 is, for example, a vinyl-insulated wire. The earth wire 72 includes an earth conductor 73, an insulating tube 74 (vinyl tube), and an earth terminal 75 (earth terminal plate). The earth conductor 73 is, for example, a copper twisted wire formed by twisting together multiple copper wires. The earth conductor 73 is inserted into the insulating tube 74 and is insulated by the insulating tube 74 (vinyl tube). In the earth wire 72, one wire end 73A and the other wire end 73B of each earth conductor 73 are positioned so as to protrude from the respective tube ends of the insulating tube 74. The earth terminal 75 is fixed (electrically fixed) to the other wire end 73B of the earth conductor 73.

[0039] As shown in Fig. 10 , the grounding pole pile X is connected (electrically connected) to the grounding electric wire 72 by connecting (electrically connecting) the other line end 5B of the electrical conductor 5 to one line end 73A of the grounding conductive wire 73 of the grounding electric wire 72. In the grounding pole pile X, the other line end 5B of the electrical conductor 5 is inserted into a crimping ring 71 (metal pipe). In the grounding electric wire 72, one line end 73A of the grounding conductive wire 73 is inserted into the crimping ring 71 while contacting the other line end 5B of the electrical conductor 5 inserted into the crimping ring 71.

[0040] The electrical conductor 5 and the earth conductor 73 (earth wire 72) are connected (electrically connected) by inserting the electrical conductor 5 and the earth conductor 73 into the crimping ring 71 and then crimping the crimping ring 71 toward the wire ends 5B, 73B (inside the crimping ring 71).The electrical conductor 5 and the earth conductor 73 are connected (electrically connected) by inserting the other wire end 5B of the electrical conductor 5 and one wire end 73A of the earth conductor 73 into the crimping ring 71 and then plastically deforming the crimping ring 71 toward the wire ends 5B, 73B (inside the crimping ring 71).

[0041] 11 , the grounding electrode pile X connected to the earth wire 72 is driven from the tip 2 into the soil layer R below the concave bottom surface 50A of a hole 50 dug in the ground E by striking the other column end surface 25B of the large-diameter cylindrical portion 25. The tip 2 and the pile body 1 (frustum cone portion 12A and cylindrical portion 11) connected to the tip 2 are driven into the soil layer R below the concave bottom surface 50A of the hole 50 by striking the other column end surface 25B of the large-diameter cylindrical portion 25. The head portion 4 (large-diameter cylindrical portion 25), terminal plate 3 (main body plate 15 and protruding plate piece 16), electrical conductor 5, and one wire end 73A side of the earth wire 72 (the crimping ring 71 and one wire end 73A side of the earth conductor 73) are positioned within the recessed hole 50 by driving the tip 2 and the pile body 1. When the tip 2 and the pile body 1 of the earth wire 72 are driven into the soil layer R below the concave bottom surface 50A, the other wire end 73B of the earth wire 72 is drawn out from the recessed hole 50 to the ground E. When the tip 2 and the pile body 1 are driven into the soil layer R below the concave bottom surface 50A, the other wire end 73B of the earth conductive wire 73 of the earth wire 72 and the earth terminal 75 are drawn out from the recessed hole 50 to the ground E.

[0042] As shown in Fig. 12, the grounding electrode pile X is buried in the ground by pulling out the other wire end 73B of the earth wire 72 (the other wire end 73B of the earth conductive wire 73 and the earth terminal 75) from the recessed hole 50 and backfilling the recessed hole 50 with soil. The pile body 1 (cylindrical portion 11 and each truncated cone portion 12A, 12B), tip portion 2, terminal plate body 3 (main body plate 15 and protruding plate piece 16), head portion 4 (large diameter cylindrical portion 25 and small diameter cylindrical portion 26), electric conductor 5 and one wire end 73A of the earth wire 72 (the crimping ring 71 and one wire end 73A of the earth conductive wire 73) are buried in the ground by backfilling the recessed hole 50 with soil.

[0043] When the earthing pole pile X has the pile body 1, tip 2, terminal plate body 3, head 4, electrical conductor 5 and one wire end 73A side of the earthing wire 72 buried in the ground, the earthing pole pile X can be used as an earthing pole by connecting the earth terminal 75 connected to the other wire end 73B side of the earthing wire 72 (the other wire end 73B side of the earthing conductor wire 73) pulled out from the recessed hole 50 to the electrical system of an electrical device or the like. [Industrial Applicability]

[0044] This device is ideal for use as a grounding electrode for electrical systems such as electrical equipment. [Explanation of symbols]

[0045] X Ground pole stake 1 Pile body 1a Outer surface of pile body 1A One end face of the pile body 1B The other end face of the pile body 1C Inner hole 2 Tip 3 Terminal board 4 head 5 Electrical Conductors 5A One end of an electrical conductor 15 Main board 15A plate surface 15B Back side of board 16 Projecting plate piece 16A Plate surface 16B Back side of plate piece 16C Projecting end surface

Claims

1. A pile body formed into a cylindrical shape from a conductive metal; A tip portion formed of a conductive metal and abutting one end surface of the pile body and fixed to the pile body; a terminal plate body formed of a conductive metal in a flat plate shape, the terminal plate body having a main body plate and a protruding plate piece protruding from an outer surface of the main body plate; a head portion formed in a cylindrical shape from a conductive metal, the head portion having a large diameter cylindrical portion and a small diameter cylindrical portion protruding from one end surface of the large diameter cylindrical portion; an electrical conductor formed of a conductive metal; The body plate is a circular hole penetrating the main body plate in the plate thickness direction of the terminal plate body and opening on the plate front surface and the plate back surface of the main body plate; The protruding plate piece is The terminal plate has a conductor insertion hole that penetrates the protruding plate piece in the plate thickness direction and opens on the front surface and the back surface of the protruding plate piece, The terminal plate body is In the radial direction of the pile body, the main body plate and the protruding plate piece protrude from the outer peripheral surface of the pile body and are arranged on the other pile end surface of the pile body, The back surface of the main body plate is abutted against the other end surface of the pile body and fixed to the pile body, The head portion The small diameter cylindrical portion penetrates from the plate surface of the main body plate to the circular hole and is arranged to protrude into the inner peripheral hole of the pile main body on the other pile end face side of the pile main body, One end surface of the large-diameter cylindrical portion is abutted against the surface of the main body plate, and the large-diameter cylindrical portion is fixed to the main body plate, The electrical conductor is The electrical conductor is inserted into the conductor insertion hole, and one end of the electrical conductor protrudes from the conductor insertion hole toward the large-diameter cylindrical portion and is disposed on the protruding plate piece. The protruding plate is fixed to the protruding plate by caulking a part of the protruding plate. A grounding pole pile characterized by:

2. The protruding plate piece is It has a caulking groove, The crimping groove is a groove formed on the protruding plate piece between the protruding end surface of the protruding plate piece and the conductor insertion hole, the groove having a depth from the protruding end surface toward the conductor insertion hole and opening on the protruding end surface; The terminal plate has a thickness direction, and the protruding plate piece is penetrated by the protruding plate piece, and the protruding plate piece has an opening on the front surface and the back surface of the protruding plate piece. The electrical conductor is The protruding plate piece is fixed to the protruding plate piece by crimping the protruding plate piece between the crimping groove and the wire insertion hole into which the electric wire is inserted. The grounding pole pile according to claim 1 .

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