JP3218652U - Rebar coupler - Google Patents

Abstract

The present invention provides a reinforcing bar coupler that can quickly and surely connect ends of two reinforcing bars in a reinforced concrete construction. A reinforcing bar coupler (1) is provided with one end of a reinforcing bar inserted into and fixed to one opening, a sleeve (10) to which a head bolt (14) is screwed into the other opening, and an inside of the sleeve. A plurality of gripping pieces 11a to 11d for gripping one end, a gripping piece holder 12 having a circular upper surface provided inside the sleeve and holding the gripping piece, and disposed between the gripping piece holder and the head bolt. The plurality of gripping pieces are magnetic bodies, and are arranged radially near the outer periphery of the circular upper surface of the gripping piece holder. [Selection] Figure 1

Description

  The present invention relates to a reinforcing bar coupler that can quickly and surely connect the ends of two reinforcing bars in reinforced concrete work.

  Conventionally, lap joints that mainly bind the ends of the reinforcing bars with a bundled wire with a fixed length are mainly used, but this method reduces the distance between the main reinforcing bars in the lap joints, and the length of the lap joints. There are problems such as increasing the amount of reinforcing bars used, making the interval between the reinforcing bars narrower, making concrete placement difficult, and inferior to the tensile and compressive forces in the axial direction. As another method, for example, there is gas pressure welding in which the ends of the reinforcing bars are brought into contact with each other and the reinforcing bars are melted and joined by a high-temperature flame. There are problems such as the need for post-examination. In addition, a steel pipe crimping joint that joins two steel bars to be joined by inserting them into a cylindrical sleeve and then crimping the steel pipe containing the two reinforcing bars with a hydraulic jack or the like does not require specialized technology. There is a drawback that special equipment is required to perform joint work.

  In order to solve the above-described problems, methods for mechanically joining two reinforcing bars have been developed and variously proposed. That is, after compression molding processing such as expansion and contraction of the reinforcing bar end, for example, hot or cold, or after the reinforcing bar end is subjected to cold swaging to smooth the rib of the reinforcing bar, the male thread is used with a screw rolling machine or the like. Processing. Reinforcing bar joints are used in which the male threaded portions of the two reinforcing bars are screwed and joined to a coupler whose inner surface is internally threaded. However, this threaded joint also requires two steps to rotate the coupler and tighten the screw, despite the fact that the rebar ends are easy to bend due to the length of the rebar and its overall material properties. There is an inconvenience in work, such as having to rebar the rebars in a straight line.

  As an invention according to Patent Document 1, a reinforcing bar joint is proposed that enables reliable joining of reinforcing bars by simple operations such as inserting a wedge between the end of a reinforcing bar and a sleeve and hitting the wedge with a hammer. Yes.

Special table 2004-520508 gazette

  However, in the reinforcing bar joint device according to Patent Document 1, there is a problem that it takes time and effort to hit the wedge with a hammer.

  In view of the above problems, an object of the present invention is to provide a reinforcing bar coupler that can quickly and surely connect the ends of two reinforcing bars in reinforced concrete work.

  In the reinforcing bar coupler according to the present invention, one end of a reinforcing bar is inserted and fixed in one opening, a cylindrical sleeve into which a head bolt is screwed and the other opening are provided inside the sleeve. A plurality of gripping pieces for gripping one end of the sleeve, a gripping piece holder provided inside the sleeve and having a circular upper surface for holding the gripping piece, and a compression disposed between the gripping piece holder and the head bolt The plurality of gripping pieces are magnetic bodies, and are arranged radially in the vicinity of the outer periphery of the circular upper surface of the gripping piece holder.

  When the plurality of gripping pieces are radially arranged near the outer periphery of the circular upper surface of the gripping piece holder, they form a reinforcing bar insertion hole into which a reinforcing bar can be inserted. The gripping piece has an inner surface on the side for gripping the reinforcing bar and an outer surface on the side in contact with the inner diameter of the sleeve, and the inner surface is radially arranged near the outer periphery of the circular upper surface of the gripping piece holder. Saw-like irregularities are formed in a side view, and the direction of the peaks of the serrated irregularities is the direction of the holding piece holder. Furthermore, the gripping piece includes a holding portion that is held and fixed in the holding space of the gripping piece holder.

The gripping piece holder has a substantially cylindrical appearance, has a circular upper surface and side surfaces, and gripping piece insertion holes for fitting the holding portions of the plurality of gripping pieces are radially arranged near the outer periphery of the upper surface. Alternatively, it may be configured to have a substantially cylindrical appearance, and on the outer periphery of the side surface, provided with a gripping piece holding portion receiving portion that accommodates the holding portions of the plurality of gripping pieces, the plurality of gripping pieces are arranged radially. You may do it.
In the former case, the gripping piece holder is preferably manufactured using a resin such as plastic, metal, or wood, and in the latter case, it is preferably manufactured using iron.

  The rebar coupler of the present invention can be used to join two rebars in new construction, reconstruction and repair work of various concrete structures such as bridges and buildings, and it is simpler without using a hammering tool. Enables stronger rebar connections. In addition, the cost can be reduced, and an effect superior in bonding strength can be obtained as compared with a general connection method.

It is a perspective view which shows the whole structure of the reinforcing bar coupler 1 which concerns on Example 1 of this invention. It is an exploded view which shows the member (except for the sleeve 10) which comprises the reinforcing bar coupler 1 which concerns on Example 1. FIG. They are the side view (a) of the holding piece 11 which concerns on Example 1, a top view (b), a bottom view (c), a front view (d), and a rear view (e). 1 is a perspective view illustrating an entire gripping piece holder 12 according to Embodiment 1. FIG. It is a figure which shows the gripping piece holding body 12 of the state which hold | maintained holding pieces 11a, 11b, 11c, and 11d among the members which comprise the reinforcing bar coupler 1 which concerns on Example 1. FIG. It is a figure which shows the usage method of the reinforcing bar coupler 1 which concerns on Example 1. FIG. It is the figure which connected the two reinforcing bars X and Y to the reinforcing bar coupler 1 which concerns on Example 1. FIG. It is a perspective view which shows the whole structure of the reinforcing bar coupler 2 which concerns on Example 2 of this invention. It is a perspective view which shows the whole holding piece holding body 22 which concerns on Example 2. FIG. It is a figure which shows the gripping piece holding body 22 of the state which hold | maintained holding piece 21a, 21b, 21c, 21d among the members which comprise the reinforcing bar coupler 2 which concerns on Example 2. FIG. It is a figure which shows the usage method of the reinforcing bar coupler 2 which concerns on Example 2. FIG. It is the figure which connected the two reinforcing bars X and Y to the reinforcing bar coupler 2 which concerns on Example 2. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same number is attached | subjected to the same part, and the overlapping description is abbreviate | omitted. It should be noted that the drawings may be exaggerated to understand the present invention, and are not necessarily shown to scale. In addition, this invention is not restricted to the Example shown below.

  Example 1 will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an overall configuration of a reinforcing bar coupler 1 according to Embodiment 1 of the present invention. FIG. 2 is an exploded view showing members (excluding the sleeve 10) constituting the reinforcing bar coupler 1 according to the first embodiment. FIG. 3 is a side view (a), a plan view (b), a bottom view (c), a front view (d), and a rear view (e) of the gripping piece 11 according to the first embodiment. FIG. 4 is a perspective view illustrating the entire gripping piece holder 12 according to the first embodiment. FIG. 5 is a diagram illustrating the gripping pieces 11 a, 11 b, 11 c, and 11 d and the gripping piece holder 12 that holds these members among the members that constitute the reinforcing bar coupler 1 according to the first embodiment.

As shown in FIG. 1, in the reinforcing bar coupler 1, one end of a reinforcing bar is inserted and fixed in one opening, and a sleeve 10 and a gripping piece 11a, 11b, 11c into which a head bolt 14 is screwed into the other opening. , 11d, and a gripping piece holder 12 holding them, and a compression coil spring 13 disposed between the gripping piece holder 12 and the head bolt 14.
In FIG. 1, below the head bolt 14 screwed into the sleeve 10, it is screwed into one opening of the lower sleeve 10, and as shown in FIG. It will be understood that Y is linked. That is, two sleeves 10 are attached to the upper and lower sides via the head bolt 14, but for convenience of explanation, in FIG. 7, they are referred to as an upper sleeve and a lower sleeve, and the gripping pieces 11a provided inside the two sleeves, It should be noted that 11b, 11c, 11d, the gripping piece holder 12, and the compression coil spring 13 are the same.
In the first embodiment, the upper sleeve 10 in FIG. 1 is a cylindrical body whose outer shape and inner diameter are tapered from the opening into which the head bolt 14 is screwed to the opening on the side where the reinforcing bar is inserted. .

  Please refer to FIG. FIG. 2 is an exploded view showing members in the sleeve 10 constituting the reinforcing bar coupler 1. That is, the sleeve 10 includes gripping pieces 11a, 11b, 11c, and 11d, a gripping piece holder 12, and a compression coil spring 13 therein.

  FIG. 3 is a side view (a), a plan view (b), a bottom view (c), a front view (d), and a rear view (e) showing the gripping piece 11. The grip piece 10 is a member that grips the reinforcing bars on the inner surface. In the first embodiment, the gripping pieces 11 are provided in four pieces. As will be described later, when the gripping piece holders 12 are radially arranged near the outer periphery of the circular upper surface of the gripping piece holder 12, a tapered substantially cylindrical body is formed. When the reinforcing bars are inserted into the gripping pieces, each of the gripping pieces 11a, 11b, 11c, and 11d comes into contact with the reinforcing bars on the inner surface, while the outer surface is caught on the inner diameter of the sleeve 10 and exhibits a wedge action.

Referring to FIGS. 3A to 3E, the gripping piece 11 includes an inner surface 111 on the side for gripping the reinforcing bar and an outer surface 113 on the side in contact with the inner diameter of the sleeve 10, and the inner surface 111 is a gripping piece. A plurality of serrated irregularities 111a, 111b, 111c, 111d, 111e, and 111f are formed in a side view in a state of being radially arranged near the outer periphery of the circular upper surface of the gripping piece holder 12, and the serrated irregularities 111a are formed. , 111b, 111c, 111d, 111e, and 111f are in the direction of the gripping piece holder 12. Here, the sawtooth irregularities of the gripping piece can be formed in an arbitrary number. On the other hand, the outer surface 113 of the gripping piece 10 has a curved surface and an inclination corresponding to the curved surface of the inner diameter of the sleeve 10. The gripping piece 10 includes a holding portion 112 that is held and fixed in the holding hole of the gripping piece holder 12.
Note that the gripping piece 10 is formed of a magnet. Therefore, when the inner surface comes into contact with the reinforcing bar, the gripping piece 10 is attracted to the reinforcing bar by the action of magnetic force. This is a major feature of the present invention.
In the first embodiment, the gripping piece 10 is composed of four pieces (11a, 11b, 11c, 11d), but is not limited, and can be composed of a plurality of two or more pieces.

Please refer to FIG. FIG. 4 is a perspective view illustrating the entire gripping piece holder 12 according to the first embodiment. As shown in FIG. 4, the gripping piece holder 12 has a substantially cylindrical appearance, includes a circular upper surface 120 having an opening 125, and a side surface 122. , 11c, 11d, gripping piece insertion holes 121a, 121b, 121c, 121d are arranged radially. In addition, a plurality of spring holding legs 123 are radially arranged on the opening edge of the bottom of the gripping piece holder 12 at the bottom of the side surface 122. In the first embodiment, four spring holding legs 123 are provided, but any number can be selected. In some cases, the spring holding legs 123 may not be provided.
The gripping piece holder 12 may be manufactured using a resin such as plastic, metal, or wood as a material.

  Please refer to FIG. FIG. 5 is a diagram showing the gripping pieces 11a, 11b, 11c, 11d and the gripping piece holding body 12 in a state in which they are held among the members constituting the reinforcing bar coupler 1. As described above, the gripping piece insertion holes 121a, 121b, 121c, and 121d into which the gripping pieces 11a, 11b, 11c, and 11d are fitted are radially arranged near the outer periphery of the upper surface 120 of the gripping piece holder 12. The size and depth of the gripping piece insertion holes 121a, 121b, 121c, and 121d are preferably slightly larger than the dimensions of the holding portions 112a, 112b, 112c, and 112d of the gripping pieces 11a, 11b, 11c, and 11d. This is because, as will be described later, when the reinforcing bar is inserted into the sleeve 10 and the inner surface of the gripping piece 11 is attracted to the reinforcing bar, it is preferable that each holding portion 112 of the gripping piece 11 is easily detached from each gripping piece insertion hole 121.

  Please refer to FIG. FIG. 6 is a diagram illustrating a method of using the reinforcing bar coupler 1 according to the first embodiment. First, the compression coil spring 13 is inserted into the sleeve 10 under the gripping piece holder 12 holding the gripping pieces 11 a, 11 b, 11 c, and 11 d, and the spring holding leg 123 of the gripping piece holder 12. A head bolt 14 is screwed into the lower opening (see FIG. 1). Then, a single reinforcing bar X to be joined is inserted into the sleeve 10 through the opening of the sleeve 10 (in the direction of the arrow) (FIG. 6A). Further, the end of the reinforcing bar X is connected to the upper surface of the gripping piece holder 12 through an opening formed by radially arranging the gripping pieces 11 a, 11 b, 11 c, and 11 d on the outer periphery of the upper surface 120 of the gripping piece holder 12. 120 is inserted so as to press (in the direction of the arrow) (FIGS. 6B and 6C). Then, the compression coil spring 13 is pressed against the upper surface of the head bolt 14 and compressed (FIG. 6C). At this time, the gripping piece holder 12 may be damaged by pressing of the reinforcing bar X. Thereafter, the reinforcing bar X is pulled out in the direction of the arrow from the state of FIG. Then, while the gripping piece 11 is attracted to the reinforcing bar X by a magnetic force, the sleeve 10 moves toward the upper opening direction of the sleeve 10, thereby applying a strong lateral pressure between the inner diameter of the sleeve 10 and the reinforcing bar X and exerting a wedge action. And fixed (FIG. 6D). That is, a strong joined state can be maintained by this wedge action. Moreover, since it is joined to the reinforcing bar X by the magnetic force of the gripping piece 11 and the sawtooth 111 formed on the inner surface thereof, it does not come out of the sleeve 10 due to vibration or external force.

  Please refer to FIG. FIG. 7 is a diagram illustrating two reinforcing bars X and Y connected to the reinforcing bar coupler 1 according to the first embodiment. As shown in FIG. 7, it will be understood that two sleeves 10 are attached up and down via a head bolt 14 and the two rebars X and Y are sequentially connected.

  Example 2 will be described in detail with reference to the drawings. The reinforcing bar coupler 2 according to the second embodiment has substantially the same configuration and functions as the reinforcing bar coupler 1 shown in the first embodiment, but the structure of the gripping piece holder 22 is the same as that of the gripping piece holder 12. to differ greatly. Portions overlapping with the first embodiment are omitted, and particularly the points that are greatly different from the first embodiment will be described in detail.

  FIG. 8 is a perspective view showing the overall configuration of the reinforcing bar coupler 2 according to Embodiment 2 of the present invention. FIG. 9 is a perspective view illustrating the entire gripping piece holder 22 according to the second embodiment. FIG. 10 is a diagram illustrating the gripping pieces 21a, 21b, 21c, and 21d and the gripping piece holding body 22 in a state in which the gripping pieces 21a, 21b, 21c, and 21d are held among the members constituting the reinforcing bar coupler 2 according to the second embodiment.

As shown in FIG. 8, in the reinforcing bar coupler 2 according to the second embodiment, similarly to the reinforcing bar coupler 1 according to the first embodiment, one end of the reinforcing bar is inserted and fixed in one opening, and the other opening is The sleeve 20 to which the head bolt 24 is screwed, the gripping pieces 21a, 21b, 21c and 21d, the gripping piece holder 22 holding these, and the gripping piece holder 22 and the head bolt 24 are disposed. The compression coil spring 23 is made of.
In the second embodiment, the upper sleeve 20 in FIG. 8 is a cylindrical body whose outer shape and inner diameter are tapered from the opening into which the head bolt 24 is screwed to the opening on the side where the reinforcing bar is inserted. .

The grip piece 20 is a member that grips the reinforcing bars on the inner surface. In Example 2, four grip pieces are provided. As will be described later, when radially disposed on the outer periphery of the circular side surface of the grip piece holder 22, a tapered substantially cylindrical body is formed, and a reinforcing bar is formed on the sleeve 20. When inserted, each of the gripping pieces 21a, 21b, 21c, and 21d comes into contact with the reinforcing bar on the inner surface, while the outer surface is caught by the inner diameter of the sleeve 20 and exhibits a wedge action.
As in the first embodiment, the inner surface of the gripping piece 20 includes a protruding portion with a protruding end facing downward. On the other hand, the outer surface of the gripping piece 20 has a curved surface and an inclination corresponding to the curved surface of the inner diameter of the sleeve 20. The grip piece 20 includes a holding portion 212 that is held and fixed to the holding wall of the grip piece holding body 22.
Note that the gripping piece 20 is formed of a magnet. Therefore, when the inner surface 213 comes into contact with the reinforcing bar, the gripping piece 20 is attracted to the reinforcing bar by the action of magnetic force.
Also in the second embodiment, the gripping piece 20 is constituted by four pieces, but is not limited, and can be constituted by a plurality of quantities of two pieces or more.

  Please refer to FIG. FIG. 9 is a perspective view illustrating the entire gripping piece holder 22 according to the second embodiment. As shown in FIG. 9, the gripping piece holder 22 has a substantially cylindrical appearance, and includes a circular upper surface 220 and a side surface 222, and holding portions for the gripping pieces 21 a, 21 b, 21 c, and 21 d on the outer periphery of the side surface 222. The gripping piece holding part receiving parts 221a, 221b, 221c, and 221d that accommodate 212a, 212b, 212c, and 212d are arranged radially. The gripping piece holder 22 is made of iron. Accordingly, the inner surfaces of the gripping piece holding portion receiving portions 221a, 221b, 221c, and 221d are attracted to the gripping piece holding portion receiving portions 221a, 221b, 221c, and 221d by the action of magnetic force.

  Please refer to FIG. FIG. 10 is a diagram illustrating the gripping pieces 21a, 21b, 21c, and 21d and the gripping piece holding body 22 in a state in which the gripping pieces 21a, 21b, 21c, and 21d are held among the members constituting the reinforcing bar coupler 2 according to the second embodiment. As described above, the grip piece holding body 22 has the grip piece holding portion receiving portions 221a, 221b, 221c, and 221d that accommodate the holding portions 212a, 212b, 212c, and 212d of the grip pieces 21a, 21b, 21c, and 21d in a radial manner. Has been placed. Note that the width and height of the gripping piece holding portion receiving portions 221a, 221b, 221c, and 221d need only be substantially the same as the dimensions of the holding portions 212a, 212b, 212c, and 212d of the gripping pieces 21a, 21b, 21c, and 21d. . The gripping piece holder 22 does not form a concave surface on its side surface, and the holding pieces 212a, 212b, 212c, and 212d of the gripping pieces 21a, 21b, 21c, and 21d are magnetically moved to hold the gripping piece holding part receiving portion 221 arbitrarily. You may make it adsorb | suck to a space.

  Please refer to FIG. FIG. 11 is a diagram illustrating a method of using the reinforcing bar coupler 2 according to the second embodiment. As in the first embodiment, first, the gripping piece holder 22 holding the gripping pieces 21 a, 21 b, 21 c, and 21 d in the sleeve 20, and the compression coil spring 23 is inserted below the bottom surface of the gripping piece holder 22. The head bolt 24 is screwed into the lower opening of the sleeve 20 (see FIG. 8). Then, one reinforcing bar X to be joined is inserted into the sleeve 20 from the opening of the sleeve 20 (in the direction of the arrow) (FIG. 11A). Further, the end of the reinforcing bar X is connected to the end of the gripping piece holder 22 through an opening formed by radially arranging the gripping pieces 21 a, 21 b, 21 c, 21 d on the outer periphery of the side surface of the upper surface 220 of the gripping piece holder 22. It inserts so that the upper surface 220 may be pressed (in the direction of the arrow) (FIGS. 11B and 11C). Then, the compression coil spring 23 is pressed against the upper surface of the head bolt 24 and compressed (FIG. 11C). Thereafter, the reinforcing bar X is pulled out in the direction of the arrow from the state of FIG. Then, while the gripping piece 21 is attracted to the reinforcing bar X by a magnetic force, the sleeve 21 moves toward the upper opening direction of the sleeve 20, thereby exerting a strong lateral pressure between the inner diameter of the sleeve 20 and the reinforcing bar X and exerting a wedge action. And fixed (FIG. 11D). That is, a strong joined state can be maintained by this wedge action. Moreover, since it is joined to the rebar X by the magnetic force of the gripping piece 21 and the sawtooth 211 formed on the inner surface thereof, it does not come out of the sleeve 20 due to vibration or external force.

  Please refer to FIG. FIG. 12 is a diagram illustrating two reinforcing bars X and Y connected to the reinforcing bar coupler 2 according to the second embodiment. As shown in FIG. 12, it can be understood that two sleeves 20 are attached to the upper and lower sides via the head bolt 24, and the two reinforcing bars X and Y are sequentially connected.

  As mentioned above, although preferred embodiment in the reinforcing bar coupler concerning this invention was illustrated and demonstrated, it will be understood that various changes are possible without deviating from the technical scope of this invention.

  The reinforcing bar coupler according to the present invention enables a stronger reinforcing bar connection despite the simple structure, and thus can be widely used in various construction sites.

1 2 Reinforcing bar coupler 10 20 Sleeve 11 21 Holding piece 111 211 Serrated irregularities 112 212 Holding section 113 213 Sleeve inner surface 12 22 Holding piece holding body 120 220 Upper surface 121 Holding piece holding section insertion hole 221 Holding piece holding section receiving section 122 222 Side surface 123 Spring holding leg 13 23 Compression coil spring 14 24 Head bolt X, Y Rebar

Claims (8)

One end of a reinforcing bar is inserted and fixed in one opening, and a cylindrical sleeve to which a head bolt is screwed in the other opening,
A plurality of gripping pieces provided inside the sleeve and gripping one end of the reinforcing bar;
A gripping piece holder having a circular upper surface provided inside the sleeve and holding the gripping piece;
A compression coil spring disposed between the gripping piece holder and the head bolt;
The reinforcing bar coupler according to claim 1, wherein the plurality of gripping pieces are magnetic bodies and are arranged radially in the vicinity of the outer periphery of the circular upper surface of the gripping piece holder.   The reinforcing bar insertion hole into which the reinforcing bar can be inserted is formed when the plurality of gripping pieces are radially arranged near the outer periphery of the circular upper surface of the gripping piece holder. Rebar coupler.   The grip piece includes an inner surface on the side for gripping the reinforcing bar and an outer surface on a side in contact with the inner diameter of the sleeve, and the inner surface is near the outer periphery of the circular upper surface of the grip piece holding body. The sawtooth-shaped unevenness is formed in a side view in a state of being radially arranged on the surface, and the direction of the peak of the sawtooth-shaped unevenness is the direction of the gripping piece holder. Rebar coupler.   The reinforcing bar coupler according to claim 1, wherein the grip piece includes a holding portion that is held and fixed in a holding space of the grip piece holding body.   The gripping piece holder has a substantially cylindrical appearance, and includes the circular upper surface and side surfaces, and gripping piece insertion holes into which the holding portions of the plurality of gripping pieces are fitted in the vicinity of the outer periphery of the upper surface. The reinforcing bar coupler according to claim 4, wherein the reinforcing bar coupler is arranged radially.   The gripping piece holder has a substantially cylindrical appearance, and includes the circular upper surface and side surfaces, and gripping piece holding portion receiving portions that receive the holding portions of the plurality of gripping pieces radially on the outer periphery of the side surface. The reinforcing bar coupler according to claim 4, wherein the reinforcing bar coupler is arranged.   The reinforcing bar coupler according to claim 5, wherein the holding piece holder is made of resin, metal, or wood. The reinforcing bar coupler according to claim 6, wherein the holding piece holding body is manufactured using iron as a material.

Images