JP2003120029A - Connecting hardware for reinforcement and separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting hardware for a reinforcement and a separator, compactly manufacturable at low cost while securing sufficient connecting strength. SOLUTION: This connecting hardware is provided with a connecting hardware body 11 of approximately U-shape having a pair of arm parts 14, 15 and a holding part 16 for connecting both arm parts 14, 15, and detachably fittable to the outer periphery of a reinforcement 1 through a rugged part 18 formed on the inner surface of the holding part 16 and fitted to the ruggedness of the reinforcement 1; a threaded hole 22 integrally provided at the connecting hardware body 11 to allow a separator 2 to be screwed with; and a bolt member 13 for drawing both arm members 14, 15 in the mutually approaching direction to reduce the diameter of the holding part 16 and to allow the holding part 16 to clamp the reinforcement 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting for connecting a reinforcing bar and a separator for connecting the reinforcing bar and the separator.

[0002]

2. Description of the Related Art Conventionally, the reinforcing bar and the separator are connected by welding, but the connection strength varies depending on the skill of the operator, the external environment at the time of welding, and the like.
In addition, since reinforcing bars may be cracked by strong cold working, heating, and welding, and the strength may be reduced, welding of reinforcing bars and separators is in the direction of being prohibited, and recently, mechanically using connecting hardware. The method of connection is widely adopted.

As the connection hardware, for example, JP-A-5-84
673, JP-A-9-268708, and JP-A-2
As described in JP-A-000-352194, a method of screwing a separator into a screw hole formed in a connecting metal object is widely adopted for connecting the separator, and a connecting portion of the reinforcing bar is a notch portion or a through hole formed in the connecting metal object. Widely adopted are a method of inserting a rebar into the and then press-contacting the inner surface of the notch or the through hole with the rebar by a bolt member, and a method of press-fitting a wedge into the gap between the notch and the through hole.

[0004]

By the way, in the above-described connecting metal object, since the connecting metal object and the separator are connected by screwing, a sufficient connection strength can be secured, but the connecting metal object and the reinforcing bar are connected. Since it is made by the frictional resistance between the metal and the rebar, in order to secure sufficient connection strength, it is necessary to set the contact area between the metal and the rebar to be large, and to strengthen the tightening force by the bolt and the pressing force by the wedge. Yes,
It was necessary to use a large one as the connecting hardware. In particular, it is easy to obtain a strong pressing force by hammering the wedge, but it may be difficult to shake the hammer effectively in the formwork with a large number of reinforcing bars. There was a problem that the pressing force fluctuated.

An object of the present invention is to provide a connecting metal member for a reinforcing bar and a separator, which can be manufactured in a small size and at a low cost and can secure a sufficient connecting strength.

[0006]

[Means and Solutions for Solving the Problems]

The metal fitting for connecting the reinforcing bar and the separator according to the present invention has a pair of arm portions and a holding portion for connecting the both arm portions, and a concavo-convex portion that fits into the concavo-convex portion of the reinforcing bar on the inner surface of the holding portion. A substantially U-shaped connecting metal body that is detachably fitted to the reinforcing bar, and is integrally provided on the connecting metal body.
A screw hole into which the separator is screwed, and a bolt member that draws the both arm portions toward each other to reduce the diameter of the holding portion and holds the reinforcing bar in the holding portion are provided.

In this connecting hardware, since the separator is screwed into the screw hole integrally provided in the connecting hardware body, the connecting strength of the separator to the connecting hardware body can be sufficiently secured. Also, by fitting the reinforcing bar to the holding part of the connecting hardware body and tightening the bolt member, both arms are drawn toward each other to reduce the diameter of the holding part, and the reinforcing bar is clamped by the connecting hardware body. Then, the connecting hardware main body and the reinforcing bar are connected, but at this time, the uneven part formed on the inner surface of the holding part fits into the unevenness of the reinforcing bar, and the reinforcing bar moves in the axial direction with respect to the connecting hardware main body. Since the rotation around the axis and the rotation about the axis are restricted, it is possible to sufficiently secure the connecting strength of the reinforcing bar to the main body of the connecting metal while making the connecting metal small.

[0009] Here, a nut member may be welded to the connecting metal body to integrally form a screw hole in the connecting metal body. Although it is possible to integrally form the screw hole in the connecting metal body, if the nut member is welded and fixed to the connecting metal body to form the screw hole, the connection strength between the connecting metal body and the separator can be easily improved.

A protrusion projecting inward is formed at least at or near the boundary between the arm portion and the holding portion, and the protrusion can be pressed against the reinforcing bar by a diameter reduction operation of the holding portion by a bolt member. You can In this case, since the projecting portion is pressed against the reinforcing bar by the diameter reduction operation of the retaining part by the bolt member, the contact area between the reinforcing bar and the connecting hardware main body can be set to a large extent, and the protrusion and the concavo-convex portion of the retaining part can be set. By setting the pressure contact force of the reinforcing bar to a large value, it is possible to further improve the connecting strength between the connecting metal body and the reinforcing bar.

As the bolt member, it is possible to use a bolt member in which a taper portion which is pressed against the reinforcing bar is formed in the middle by a diameter reduction operation of the holding portion. In this case, the taper portion is pressed into contact with the reinforcing bar by the diameter reduction operation of the holding portion, so that the contact area between the reinforcing bar and the connecting hardware can be set large, and the pressing force of the reinforcing bar to the uneven portion of the holding portion can be set. By setting a large value, the connection strength between the connecting hardware body and the reinforcing bar can be further improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the connecting hardware 10 includes a substantially U-shaped connecting hardware body 11 that can be detachably fitted onto the reinforcing bar 1 and a connecting hardware body 1.
Nut member 12 screwed with separator 2 fixed to 1
And a bolt member 13 provided between the pair of arm portions 14 and 15 of the connecting hardware body 11.

As the reinforcing bars 1, a pair of vertical ridges 3 extending in the axial direction on the outer surface and a substantially semicircular left and right extending in the circumferential direction, which are provided at regular intervals in the axial direction, are provided in order to enhance the bonding strength to concrete. It is possible to employ a well-known structure in which one set of horizontal ridges 4 is formed, and one set of left and right horizontal ridges 4 whose arrangement pitch is shifted by a half pitch in the axial direction is formed. Further, as the separator 2, it is possible to adopt a well-known structure made of a metal rod having a threaded portion 5 formed at its end. However, it is also possible to employ, as the reinforcing bar 1, one in which square or rectangular recesses are formed at regular intervals. In this case, the concavo-convex portion 18 formed on the inner surface of the holding section 16 described below is a reinforcing bar. 1
Will be formed in a shape that conforms to the irregularities on the outer surface of the.

The connecting hardware body 11 is formed by forming a metal plate into a substantially U shape, and includes a pair of arm portions 14 and 15 and a holding portion 16 having a substantially semi-cylindrical shape for connecting the arm portions 14 and 15. have. On the inner surface of the holding portion 16, the left and right lateral protrusions 4 of the reinforcing bar 1 are provided.
A pair of left and right protrusions 17 is formed by press molding at the same pitch as the above, and the protrusions 17 are formed on the inner surface of the holding portion 16 so as to fit the horizontal protrusions 4 and the vertical protrusions 3 of the reinforcing bar 1. Part 1
8 is formed. In addition, instead of the ridge 17, the holding portion 1
A groove may be formed on the inner surface of 6 to be fitted into the vertical protrusion 3 and the horizontal protrusion 4 of the reinforcing bar 1.

An insertion hole 19 into which the bolt member 13 is inserted is formed in the first arm portion 14, and a screw hole 20 into which the bolt member 13 is screwed is formed in the second arm portion 15 to connect with the second arm portion 15. A projecting portion 21 projecting inward is formed over the entire length at the boundary with the holding portion 16. The insertion hole 19 and the screw hole 20 can be formed at the free ends of the arm portions 14 and 15, but the elastic strength of the arm portions 14 and 15 causes the coupling strength between the coupling hardware body 11 and the reinforcing bar 1. Therefore, it is preferable to form it on the holding portion 16 side as much as possible. The protrusion 21 may be formed on the first arm portion 14 or both arm portions 14 and 15.

As the bolt member 13, it is possible to suitably employ a steel bolt that has been subjected to heat treatment so as to have a high tensile strength so that a sufficient tightening force can be applied. The screw nominal of the bolt member 13 is set according to the diameter of the reinforcing bar 1 and the separator 2. For example, when the separator 2 having a diameter of 8 mm is used, the nominal bolt of M8 or M10 is used. Will be used.

When connecting the reinforcing bar 1 to the connecting hardware 10, as shown in FIG. 4, the reinforcing bar 1 is fitted inside the holding portion 16 and the bolt member 13 is inserted through the insertion hole 19. The end portion is screwed into the screw hole 20 and the bolt member 13 is tightened as shown in FIG. 3, whereby both the arm portions 14 and 15 are pulled toward each other to approach the holding portion 1.
The diameter of 6 is reduced, the reinforcing bar 1 is sandwiched by the holding portion 16, and the connecting metal body 11 and the reinforcing bar 1 are connected. Further, at this time, the ridges 17 formed on the inner surface of the holding portion 16 are engaged with the vertical ridges 3 and the horizontal ridges 4 of the reinforcing bar 1 to move the axial direction of the reinforcing bar 1 relative to the connecting hardware main body 11 and the axis thereof. The rotation around the center is restricted. In addition, a part of the protrusion 21 wraps around the upper side of the reinforcing bar 1 to increase the contact area between the connecting hardware main body 11 and the reinforcing bar 1, and the pressing force of the reinforcing bar 1 to the inner surface of the holding portion 16 increases. The connecting strength of the reinforcing bar 1 to the connecting hardware body 11 is sufficiently secured.

The nut member 12 is fixed to the outer surface of the holding portion 16 by welding, and the separator 2 is screwed into the screw hole 22 of the nut member 12 so as to connect the coupling hardware 10 and the separator 2. Has been done. It should be noted that the nut members 12 can be provided in any number in any position of the coupling hardware body 11 with the screw holes 22 oriented in any direction, depending on the layout of the separator 2 and the like. For example, the nut member 12 may be welded and fixed to the arm portion 15 of the connecting hardware body 11 in a direction orthogonal to the reinforcing bar 1 as in the connecting hardware 10D shown in FIG. Further, the nut member 12 is preferably fixed by welding in order to sufficiently secure the coupling strength to the connecting metal body 11, but it is also possible to fix it to the connecting metal body 11 with a screw or the like. Further, the nut member 12 may be divided into upper and lower halves so that the separator 2 can be detached from the nut member 12 from the side, and the nut member 12 may be coupled with a screw or the like. In this case, loosen the screw to move the nut member to an arbitrary position in the middle of the separator 2, and tighten the screw to screw the separator 2 into the nut member without screwing the separator 2 into the nut member. it can.

According to the connecting metal member 10 of the reinforcing bar and the separator, a simple U-shaped connecting metal member main body 11, a nut member 12 welded and fixed thereto and a bolt member 13 screwed to the connecting metal member main body 11 are used. The connecting strength of the separator 2 to the connecting metal body 11 is sufficiently secured by screwing the separator 2 into the screw hole 22 of the nut member 12 welded and fixed to the connecting metal body 11 while adopting a configuration that can be manufactured at low cost. Also, regarding the connecting strength of the reinforcing bar 1 to the connecting hardware main body 11, the reinforcing bar 1 was fitted to the holding portion 16 in which the concave and convex portion 18 that fits to the horizontal protruding line 4 and the vertical protruding line 3 of the reinforcing bar 1 was formed. In this state, the holding portion 16 can be sufficiently secured by tightening the holding member 16 in the diameter reducing direction with the bolt member 13, so that it is possible to sufficiently secure the connecting strength between the separator 2 and the reinforcing bar 1. .

Next, another embodiment in which the structure of the coupling hardware 10 is partially changed will be described. The same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. 1) A bolt member 1 such as the connecting hardware 10A shown in FIG.
In place of 3, the bolt member 13A having the taper portion 30 formed in the middle thereof is used, and by tightening the bolt member 13A, the taper portion 30 is pressed against the reinforcing bar 1 to push the reinforcing bar 1 toward the inner surface of the holding portion 16. It may be configured to hit. In this case, since the taper portion 30 is pressed against the reinforcing bar 1,
The contact area between the reinforcing bar 1 and the connecting hardware 10 can be set to a large extent, and the reinforcing bar 1 for the protrusion 17 of the holding portion 16 can be set.
The pressure contact force of is set to a large value, and the connecting hardware body 11 and the reinforcing bar 1
The connection strength with can be further improved.

2) The nut member 12 may be omitted, and a screw hole may be directly formed in the connecting hardware body 11, and the separator 2 may be screwed into the screw hole. Specifically, as in the connecting hardware 10B shown in FIG. 6, in place of the connecting hardware body 11, a pair of brackets 31 and 32 extending downward are formed at both ends in the axial direction of the holding portion 16 to form the connecting hardware. Using the main body 11B,
A through hole 33 through which the separator 2 is inserted is formed in the first bracket portion 31, a screw hole 34 that is screwed into the screw portion 5 of the separator 2 is formed in the second bracket portion 32, and an end of the separator 2 is formed in the through hole 33. The threaded portion 5 of the separator 2 is screwed into the screw hole 34,
The separator 2 may be connected to the connecting hardware body 11. In this case, since the nut member 12 can be omitted, the manufacturing cost of the coupling hardware 10 can be further reduced. When the screw portion 5 of the separator 2 is relatively long, a screw hole may be formed in the first bracket portion 31 instead of the through hole 33. Further, only one bracket portion may be provided and a screw hole into which the screw portion 5 of the separator 2 is screwed may be formed therein.

3) Instead of the connecting metal body 11 as in the connecting metal body 10C shown in FIGS. 7 and 8, a substantially U-shaped connecting metal body 11C having no projection 21 may be used.

[0023]

EFFECT OF THE INVENTION According to the connecting metal article of the reinforcing bar and the separator according to the present invention, it comprises a substantially U-shaped connecting metal body, a screw hole integrally formed with the connecting metal body, and a bolt member screwed to the connecting metal body. While adopting a configuration that can be easily and inexpensively manufactured,
The connecting strength of the separator to the connecting metal body is sufficiently secured by screwing the separator into the screw hole integrally provided in the connecting metal body. The strength of the connection between the separator and the reinforcing bar can be sufficiently secured by tightening the holding part in the direction of diameter reduction with a bolt member while the reinforcing bar is fitted to the holding part with the concavo-convex part to be fitted. It becomes possible to secure enough.

Here, when a nut member is welded to the body of the connecting hardware to integrally form a screw hole in the body of the connecting hardware, the connecting metal body is compared with the case where the screw hole is integrally formed in the body of the connecting hardware. The connection strength between the main body and the separator can be easily improved.

A projecting portion projecting inward is formed at least at or near the boundary between the arm portion and the holding portion, and the projecting portion can be pressed against the reinforcing bar by a diameter reduction operation of the holding portion by a bolt member. In this case, the projecting portion is pressed against the rebar by the diameter reduction operation of the holding part by the bolt member, so that the contact area between the rebar and the main body of the connecting hardware can be set large, and the uneven portion of the holding part can be set. It is possible to further improve the connecting strength between the connecting metal body and the reinforcing bar by setting a large pressure contact force of the reinforcing bar against the reinforcing bar.

If the bolt member is formed with a taper portion which is pressed against the rebar by the diameter reduction operation of the holding portion and formed in the middle, the taper portion is pressed against the rebar by the diameter reduction operation of the holding portion. Therefore, the contact area between the reinforcing bar and the connecting metal object can be set to be large, and the pressure contact force of the reinforcing bar to the uneven portion of the holding portion can be set to be large to further improve the connecting strength between the connecting metal body and the reinforcing bar.

[Brief description of drawings]

FIG. 1 is a side view of a connecting metal object in a state where a reinforcing bar and a separator are connected to each other.

FIG. 2 is a plan view of a connected metal piece in a state where a reinforcing bar and a separator are connected to each other.

FIG. 3 is a sectional view taken along line III-III in FIG.

[Fig. 4] Fig. 3 in which the bolt member is removed
Corresponding figure

FIG. 5 is a side view of a connecting metal article having another structure in a state where the reinforcing bar and the separator are connected to each other.

FIG. 6 is a view corresponding to FIG. 3 in the case of using a connecting hardware of another configuration.

FIG. 7 is a side view of the connecting hardware of another configuration.

FIG. 8 is a front view of the same connected hardware.

FIG. 9 is a side view of a connecting metal article having another structure in a state where the reinforcing bars and the separator are connected to each other.

[Explanation of symbols]

1 rebar 2 separator 3 Vertical ridges 4 Horizontal ridges 5 screw part 10 Consolidated Hardware 11 Consolidated Hardware Main Body 12 Nut member 13 Bolt member 14 First Arm 15 Second Arm 16 Holding part 17 Ridge 18 Concavo-convex part 19 Insertion hole 20 screw hole 21 protrusion 22 screw holes 10A Connection hardware 13A Bolt member 30 taper part 10B connected hardware 11B connected hardware body 31 bracket part 32 bracket part 33 through hole 34 screw hole 10C connected hardware 11C connected hardware body 10D connected hardware

Claims (4)

[Claims] 1. A pair of arm portions and a holding portion for connecting the both arm portions, and a concavo-convex portion which fits into the concavo-convex portion of the reinforcing bar is formed on an inner surface of the holding portion, which is attachable to and detachable from the reinforcing bar. U-shaped coupling hardware main body that can be externally fitted to the connector, a screw hole that is integrally provided in the coupling hardware main body, and into which the separator is screwed, and both arm portions are drawn closer to each other and held. A connecting metal member for a reinforcing bar and a separator, comprising: a bolt member that reduces the diameter of the portion and holds the reinforcing bar between the holding portions. 2. A nut member is welded to the connecting hardware body to integrally form a screw hole in the connecting hardware body.
Connected metal parts of the rebar and the separator described. 3. A protrusion projecting inward is formed at least at or near a boundary portion between the arm portion and the holding portion, and the protrusion is made into a reinforcing bar by a diameter reduction operation of the holding portion by a bolt member. The metal fitting for connecting the reinforcing bar and the separator according to claim 1 or 2, which can be pressure-welded. 4. The reinforcing bar according to claim 1, wherein the bolt member is formed with a taper part which is pressed against the reinforcing bar in the middle by a diameter reduction operation of the holding part. Connected hardware of separator.