JP7153359B2 - equipotential bonding fittings - Google Patents

Description

TECHNICAL FIELD The present invention relates to an equipotential bonding metal fitting for suppressing the potential difference that occurs in a building made of reinforced concrete when lightning strikes, and for protecting various electrical equipment in the building.
It is about.

Conventionally well-known equipotential bonding fittings, as also shown in Patent Document 1, include a pair of metal clamps for clamping reinforcing bars, bolts for fastening reinforcing bars for clamping the pair of metal clamps to each other, and one It consists of a lead wire attachment portion provided on a metal clamp, and the lead wire attachment portion has a flat plate portion integrally extending from one of the metal clamps and a crimp terminal plate fixed to the end of the lead wire. It was to be integrated by fastening with bolts and nuts.

Japanese Patent Application Laid-Open No. 2011-155769

In the conventionally known equipotential bonding fittings as described above, it is assumed that the crimp terminal plate is fixed to the end of the lead wire, so the lead wire before the crimp terminal plate is attached is used. I couldn't do it.

The present invention proposes an equipotential bonding fitting that can solve the conventional problems as described above. For the sake of simplicity, the reference numerals used in the description of this embodiment are shown in parentheses: a pair of metal clamps (1, 2) for clamping the reinforcing bars (R); In an equipotential bonding fitting consisting of a reinforcing bar fastening bolt (22) for fastening clamps (1, 2) to each other and a lead wire attachment part (6) provided on one metal clamp (1), the lead wire The mounting portion (6) has a lead wire insertion through hole penetrating one of the metal clamps (1) parallel to the length direction of the reinforcing bars (R) clamped by the pair of metal clamps (1, 2). (7), a metal lead wire retainer (3) inserted into the lead wire insertion through hole (7), and a through screw hole penetrating the peripheral wall of the lead wire insertion through hole (7). It consists of a lead wire fastening bolt (8) which is screwed through (13) and whose inner end abuts on the lead wire retainer (3).

According to the above configuration of the present invention, the equipotential bonding fitting of the present invention is obtained by fastening the pair of metal clamps with the reinforcing bar fastening bolts in a state where the reinforcing bar is sandwiched between the pair of metal clamps. is fixed to the required position of the reinforcing bar, a predetermined length region of the terminal of the lead wire, which is not attached with the crimp terminal plate conventionally used at the terminal, is inserted into the lead wire insert provided on one of the metal clamps. Inside the lead wire retainer in the general through-hole (the side opposite to the lead wire fastening bolt), preferably to such an extent that the end of the lead wire protrudes from the other end of the lead wire insertion through-hole Insert up to After that, by tightening the lead wire fastening bolt and pressing the lead wire retainer with the inner end of the bolt to the side where the lead wire is present, the lead wire inserted in the lead wire insertion through-hole is pulled out from the lead wire. It is sandwiched between the pressing tool and the inner surface of the lead wire insertion through hole.

As described above, a lead wire with no crimp terminal plate attached to the end can be easily fixed to one of the pair of metal clamps holding the reinforcing bar. There is no risk of damage to the lead wire on the tip surface of the bolt, compared to the case where the lead wire is directly pressed and fixed on the tip surface of the bolt. It is possible to sufficiently increase the area of contact conduction with the clamping tool, and to reliably obtain the effect of equipotential bonding, which is the intended purpose.

When carrying out the above-described present invention, by forming bent portions adjacent to both ends of the metal holding member at both ends of the lead wire retainer, the lead wire can be easily inserted into the lead wire insertion hole. This eliminates the possibility that the position of the wire retainer will unexpectedly move in the length direction of the lead wire insertion through hole. However, the lead wire retainer (3) is attached to the main body (10) inserted into the lead wire insertion through-hole (7) and to the outside of the metal clamp (1) from one end of the main body (10). The lead wire fastening bolt (8) is inserted into the through screw hole (13) via a bolt insertion hole (12) provided in the extension (11). ), the lead wire clamp can be temporarily fixed in place by the lead wire fastening bolt, and when the lead wire is inserted into the lead wire insertion through hole, the lead wire It is no longer necessary to set the pressing tool in the lead wire insertion through-hole, and workability is further improved.

When adopting the above configuration, two lead wire fastening bolts (8, 9) are provided so as to be able to fasten two points in the length direction of the main body (10) of the lead wire retainer (3), One of the two lead wire fastening bolts (8, 9) is inserted through the bolt insertion hole (12) provided in the extension (11) of the lead wire retainer (3). With this configuration, the lead wire can be effectively pressed against the inner surface of the lead wire insertion through hole and the inner surface of the lead wire retainer even if the total length of the lead wire insertion through hole and the lead wire retainer is increased. Moreover, the lead wire retainer can be temporarily fixed at a predetermined position with a single lead wire fastening bolt.

The area of the lead wire retainer (3) to be inserted into the lead wire insertion through hole (7) has an arcuate cross section along the inner peripheral surface of the lead wire insertion through hole (7). By forming the lead wire retainer, the bending strength of the region of the lead wire retainer inserted into the lead wire insertion through-hole is increased, and the lead wire retainer holds the lead around the point pressed by the lead wire fastening bolt as a fulcrum. Eliminates the risk of bending away from the line.

The configuration for clamping and fastening the reinforcing bars by the pair of metal clamps is not particularly limited, but the following configuration is desirable as a preferable configuration. That is, one of the metal clamps (1) provided with the lead wire attachment portion (6) has lead wire through-holes on the side opposite to the lead wire fastening bolts (8, 9). Equipped with a reinforcing bar fitting recessed groove (15) provided so as to be continuous over the entire length parallel to the hole (7), the other metal clamp (2) is the length of the one metal clamp (1). A belt-shaped top plate portion (16) in a direction perpendicular to the longitudinal direction, and a pair of belt-shaped top plate portions (16) continuously connected from both sides of the belt-shaped top plate portion (16) to the side where the one metal clamp (1) is located. The pair of side plate portions (17, 18) are provided on one end side in the length direction of the other metal clamp (2). On the other side, there are formed reinforcing bar fitting recesses (19, 20) for sandwiching the reinforcing bar (R) between the reinforcing bar fitting recessed grooves (15) of the one metal clamp (1) and the other metal clamping tool (1). A through hole (21) is provided in the belt-shaped top plate (16) at the other end of the clamp (2) in the length direction, and the reinforcing bar fastening bolt (22) is inserted into the through hole (21). ) is screwed into a threaded hole (23) provided in one of the metal clamps (1). According to this configuration, the metal fitting of the present invention can be firmly, simply, and stably fastened to the reinforcing bar while using a single reinforcing-bar fastening bolt.

FIG. 1 is a longitudinal front view. FIG. 2 is a longitudinal side view. FIG. 3 is a perspective view showing components excluding bolts.

An embodiment of the present invention will be described below with reference to the attached FIGS. 3 is a lead wire clamp made of hot-dip galvanized steel plate (SGCC). The main metal clamp 1 is composed of a prismatic clamp main body 4 and a projecting plate-like portion 5 extending to one side flush with the bottom surface of the clamp main body 4, and is provided with a lead wire attachment portion 6. ing. The lead wire attachment portion 6 includes a lead wire insertion through hole 7 having a circular cross-section extending through the entire length of the center position of the clamp body 4, and a lead wire retainer inserted into the lead wire insertion through hole 7 from one end. 3 and two lead wire fastening bolts 8 and 9 . The lead wire retainer 3 includes a retainer body 10 having a length substantially equal to the total length of the lead wire insertion through-hole 7 and a parallel to the retainer body 10 folded back from one end of the retainer body 10 in a U-shape. A circular bolt insertion hole 12 is provided in the extension portion 11 .

The main metal clamp 1 is provided with through-screw holes 13 and 14 whose inner ends are open to the lead wire insertion through-holes 7 at two locations separated by the same distance from both ends in the lengthwise direction of the upper surface thereof, Two lead wire fastening bolts 8 and 9 are provided which are screwed through these through screw holes 13 and 14 and whose inner ends are in contact with the presser body 10 . The extending portion 11 of the lead wire retainer 3 is such that when the entire retainer main body 10 is inserted into the lead wire insertion through hole 7 , the bolt insertion hole 12 of the extending portion 11 is aligned with the extending portion 11 . The lead wire fastening bolt 8 or 9 is configured to be positioned concentrically just above the through screw hole 13 or 14 on the side with the lead wire holding tool 3 is screwed into the through screw hole 13 or 14 via the bolt insertion hole 12 of the extending portion 11 of 3. As shown in FIG. The retainer main body 10 inserted in the lead wire through-hole 7 is formed to have an arcuate cross section along the inner peripheral surface of the lead wire through-hole 7 .

In the bottom surface of the clamp main body 4 of the main metal clamp 1, a rebar-fitting recessed groove 15 is formed so as to be continuous over the entire length parallel to the lead wire insertion through-hole 7 . The sub metal clip 2 has a belt-shaped top plate portion 16 in a direction perpendicular to the length direction of the clamp main body 4 of the main metal clip 1, and main metal clamps from both sides of the belt-shaped top plate portion 16. It has a U-shaped vertical cross section and has a pair of side plate portions 17 and 18 connected to the side where the clamp 1 is located. The side plate portions 17 and 18 of the sub metal clamp 2 are formed with reinforcing bar fitting recessed portions 19 and 20 for clamping the reinforcing bar R between the reinforcing bar fitting recessed groove portion 15 of the main metal clamp 1 and the sub metal clamp 2. A through hole 21 is provided in the belt-shaped top plate portion 16 at the other end in the length direction, and a reinforcing bar fastening bolt 22 inserted into the through hole 21 is inserted into the projecting plate portion 5 of the main metal clamp 1. It is configured to be screwed into the provided through screw hole 23 .

The equipotential bonding fitting configured as described above is used to electrically connect a reinforcing bar R used in a reinforced concrete building to another reinforcing bar or steel frame with a lead wire L, The reinforcing bar fastening bolt 22 connecting the main metal clamp 1 and the sub metal clamp 2 is loosened, and the reinforcing bar fitting groove 15 of the main metal clamp 1 and the reinforcing bar of the sub metal clamp 2 are loosened. The space between the fitting recesses 19 and 20 is widened, and the main metal clip 1 and the sub metal clip 2 are fitted to the reinforcing bar R from the side so that the reinforcing bar R enters between them. After that, the reinforcing bar fastening bolt 22 is tightened to clamp the reinforcing bar R between the reinforcing bar fitting groove 15 of the main metal clamp 1 and the reinforcing bar fitting recesses 19 and 20 of the sub metal clamp 2. conclude. At this time, of the pair of side plate portions 17 and 18 of the sub metal clamp 2 , the end portions 17 a and 18 a on the side where the reinforcing bar fastening bolt 22 is located are projected from the main metal clamp 1 . It is configured to be close to the bottom surface of the plate-like portion 5 .

After the equipotential bonding fittings of the present invention are attached to the predetermined locations of the reinforcing bars R as described above, the lead wire fastening bolts 8 and 9 of the main metal clamp 1 are unscrewed, and the lead wire retainer 3 is secured. With the presser body 11 separated from the inner surface of the lead wire insertion through hole 7 facing it, the end of the lead wire L to which the crimp terminal plate is not attached is attached to the lead of the main metal clamp 1. The lead wire retainer 3 is inserted into the wire insertion through-hole 7 from the side of the extension 11 between the retainer main body 11 and the inner surface of the lead wire insertion through-hole 7 facing thereto. After the lead wire L is sufficiently inserted into the lead wire insertion through hole 7 to such an extent that the end of the lead wire L protrudes from the other end of the lead wire insertion through hole 7, the main metal clamp 1 can be used for fastening the lead wire. The bolts 8 and 9 are screwed in to press the retainer main body 11 of the lead wire retainer 3 whose inner ends are inserted in the lead wire insertion through hole 7 toward the lead wire L side, thereby connecting the retainer main body 11 and the lead wire retainer body 11 together. The connection of the lead wire L to the reinforcing bar R is completed by clamping and fastening the lead wire L between the inner surface of the lead wire insertion through hole 7 .

The equipotential bonding fitting of the present invention suppresses the potential difference that occurs in a reinforced concrete building during a lightning strike, and connects rebars to each other or to a rebar and a steel frame with lead wires in order to protect various electrical equipment in the building. It can be utilized as a means for connecting the lead wire to the rebar in the case.

1 main metal clamp 2 secondary metal clamp 3 lead wire clamp 4 clamp main body 5 projecting plate-shaped portion 6 lead wire mounting portion 7 lead wire insertion through hole 8, 9 lead wire fastening bolt 10 clamp main body 11 extending portion 12 bolt insertion hole 13, 14 through screw hole 15 concave groove portion for reinforcing bar fitting 16 belt-like top plate portion 17, 18 pair of side plate portions 17a, 18a end portion of side plate portion 19, 20 concave portion for reinforcing bar fitting 21 penetration Hole 22 Reinforcement bar fastening bolt 23 Through screw hole R Reinforcement bar L Lead wire

Claims (5)

An equipotential bonding fixture consisting of a pair of metal clamps for clamping a reinforcing bar, a reinforcing bolt for fastening the pair of metal clamps to each other, and a lead wire attachment portion provided on one of the metal clamps. , the lead wire attachment portion includes a lead wire insertion through-hole passing through one of the metal clamps in parallel with the length direction of the reinforcing bars clamped by the pair of metal clamps, and a lead wire insertion through-hole in the lead wire insertion through-hole. It consists of an inserted metal lead wire retainer and a lead wire fastening bolt that is screwed through a through-screw hole that penetrates the peripheral wall of the lead wire insertion through-hole and whose inner end abuts the lead wire retainer. equipotential bonding fittings. The lead wire retainer has a main body to be inserted into the lead wire insertion through-hole, and an extension portion extending from one end of the main body to the outside of the metal clip. 2. The equipotential bonding fitting according to claim 1, which is configured to be screwed into said through screw hole via a bolt insertion hole provided in said extension. Two lead wire fastening bolts are provided so as to fasten two positions in the length direction of the main body of the lead wire retainer, and one of the two lead wire fastening bolts is connected to the lead wire. 3. The equipotential bonding metal fitting according to claim 2, which is configured to be inserted through a bolt insertion hole provided in the extending portion of the pressing metal fitting. 4. The method according to any one of claims 1 to 3, wherein the region of said lead wire retainer to be inserted into said lead wire insertion through-hole is formed to have an arcuate cross section along the inner peripheral surface of said lead wire insertion through-hole. Equipotential bonding hardware according to any one of claims 1 to 3. One of the metal clamps provided with the lead wire attachment portion is provided on the side opposite to the lead wire fastening bolt so as to be continuous over the entire length parallel to the lead wire insertion through hole. Equipped with a recessed groove portion for fitting a reinforcing bar, the other metal clamp includes a belt-shaped top plate portion in a direction orthogonal to the length direction of the one metal clamp and the above-mentioned belt-shaped top plate portion from both sides of the belt-shaped top plate portion. It has a U-shaped vertical cross-section and a pair of side plate portions connected to one side of the metal clamp, and the pair of side plates are arranged on one end side in the length direction of the other metal clamp. In the side plate portion of the one of the metal clamps, a reinforcing bar fitting concave portion for clamping a reinforcing bar is formed between the reinforcing bar fitting concave groove portion of the one metal clamp, and the other end side of the other metal clamp in the length direction A through hole is provided in the belt-shaped top plate portion, and the reinforcing bar fastening bolt inserted into the through hole is screwed into a screw hole provided in the one metal clamp. An equipotential bonding fitting according to any one of claims 1 to 4.

Images