JP7623640B2 - Rebar holder - Google Patents

Description

The present invention relates to a rebar retainer.

Reinforced concrete structures use reinforcing bars as a core material to reinforce concrete, which is weak in tension. In reinforced concrete structures, the core material is, for example, a lattice of main bars and shear reinforcement bars (hoops, stirrups) or a lattice of reinforcing bars.
If the rebars are significantly displaced from their designated positions during concrete pouring, the designed strength may not be achieved, so the rebars are tied together at the intersections. For example, bundling wire (gauge wire) is used to tie the rebars together, but bundling using wire is time-consuming and requires skill.
In order to simplify the task of bundling reinforcing bars, for example, Patent Document 1 discloses a reinforcing bar spacer that presses a first reinforcing bar and a second reinforcing bar that crosses the first reinforcing bar together. This reinforcing bar spacer includes a spacer body made of concrete or mortar and a mounting bracket that is rotatably attached to the spacer body, and the spacer body has a groove into which the first reinforcing bar is fitted. The mounting bracket is made of steel wire and holds the second reinforcing bar that crosses the first reinforcing bar in the groove while biasing it toward the first reinforcing bar.

WO2019/064404 Brochure

In the reinforcing bar spacer described in Patent Document 1, the second reinforcing bar is held only by a mounting bracket made of steel wire, which makes it easy for excessive load to be placed on the mounting bracket, and there is a risk that the holding force for the second reinforcing bar will be reduced.
The present invention has been made in consideration of the above circumstances, and an object of the present invention is to increase the holding force of the first reinforcing bar and the second reinforcing bar.

In order to solve the above problems, the present invention provides a rebar holder that clamps and holds a first rebar and a second rebar in a crossed state, comprising a first pressure plate and a second pressure plate that are arranged so that their leading edges are close to or in contact with each other and the distance between them gradually increases toward the other end edge opposite the leading edges, an elastic biasing member that elastically biases the first and second pressure plates to maintain a closed position in which the leading edges are close to or in contact with each other and holds the first and second pressure plates to allow them to open from the closed position when an opening force against the elastic biasing force is applied, and a first rebar that is pivotally supported by a pivot support portion provided near the leading edges of the first and second pressure plates so as to be freely rotatable along a trajectory parallel to a plane perpendicular to the plate surface of each pressure plate. The device is equipped with a first locking member and a second locking member for locking the reinforcing bars, and the first and second pressure plates are provided at the center of each leading edge with a first fitting recess and a second fitting recess that are notched toward the other leading edge and can simultaneously fit and support the first reinforcing bar, and the second reinforcing bar can be fitted into the clamping space between the first reinforcing bar, which is fitted and supported by the first and second fitting recesses, and the leading edges of the first and second pressure plates, in a position that crosses the first reinforcing bar and while the first and second pressure plates are being expanded, and when the first reinforcing bar is inserted across the first and second fitting recesses and the second reinforcing bar is held in the clamping space, each locking member locks the first reinforcing bar.

According to the present invention, the holding force of the first reinforcing bar and the second reinforcing bar can be increased.

1 is a perspective view illustrating a state in which first and second reinforcing bars are held by the reinforcing bar holder of this embodiment. FIG. 1 is a cross-sectional view illustrating columns, beams, slabs, and walls in a reinforced concrete building. (a) is a front view of the reinforcing bar holder, (b) is a left side view of the reinforcing bar holder, (c) is a right side view of the reinforcing bar holder, (d) is a rear view of the reinforcing bar holder, (e) is a plan view of the reinforcing bar holder, and (f) is a bottom view of the reinforcing bar holder. 5A and 5B are diagrams illustrating a procedure for installing the reinforcing bar holder, in which FIG. 5A is a left side view showing the state before installation, and FIG. 5B is a front view showing the state before installation. 1A and 1B are diagrams explaining the procedure for installing the reinforcing bar holder, in which (a) is a left side view showing the state in which each pressure plate has been spread open and the reinforcing bar holder has been moved halfway toward the base end, and (b) is a front view showing the state in which each pressure plate has been spread open and the reinforcing bar holder has been moved halfway toward the base end. 1A and 1B are diagrams explaining the procedure for installing the reinforcing bar holder, in which (a) is a left side view showing the state in which each pressure plate has been spread open and the reinforcing bar holder has been moved to the end in the base end direction, and (b) is a front view showing the state in which each pressure plate has been spread open and the reinforcing bar holder has been moved to the end in the base end direction. 1A and 1B are diagrams illustrating the installation procedure for the reinforcing bar holder, in which (a) is a left side view illustrating the state in which the first reinforcing bar is engaged by the tip end of each engaging member, and (b) is a front view illustrating the state in which the first reinforcing bar is engaged by each engaging portion of each engaging member.

The following describes an embodiment of the present invention with reference to the drawings. However, unless otherwise specified, the components, types, combinations, shapes, relative positions, etc. described in the embodiment are merely illustrative examples and do not intend to limit the scope of the present invention.

<Outline of rebar holder 1>
First, an overview of the reinforcing bar holder 1 will be described. Fig. 1 is a perspective view illustrating a state in which first and second reinforcing bars RB1 and RB2 are held by the reinforcing bar holder 1 of this embodiment.
As shown in FIG. 1, the reinforcing bar retainer 1 of this embodiment is used as a core material of a reinforced concrete structure, and is a device that clamps and holds a first reinforcing bar RB1 and a second reinforcing bar RB2 that intersect with each other at their intersection.

This reinforcing bar retainer 1 comprises a first pressure plate 11 and a second pressure plate 12 arranged such that leading edges 11a, 12a are close to or in contact with each other and the distance between them gradually increases toward base edges 11b, 12b (see FIG. 3(b)) opposite the leading edges 11a, 12a, and the pressure plates 11, 12 are elastically biased to maintain the leading edges 11a, 12a in a closed position (see FIG. 3(b)) close to or in contact with each other. Both are equipped with a leaf spring portion 13 (elastically biasing member) that holds the plate so as to allow it to open from the closed position when an opening force is applied against the elastic biasing force, and first and second engaging members 21, 22 for engaging the first rebar, which are respectively supported so as to be freely rotatable along a trajectory parallel to a plane perpendicular to the plate surfaces of each pressure plate 11, 12 by first and second pivot support portions 15, 17 provided at positions near the respective tip edges 11a, 12a of each pressure plate 11, 12.
At the left and right central portions of each leading edge 11a, 12a of each pressure plate 11, 12, first and second mating recesses 14, 16 are provided which are notched toward the other end edges 11b, 12b and can simultaneously fit and support the first reinforcing bar RB1, and the second reinforcing bar RB2 can be fitted into the clamping space SP between the first reinforcing bar RB1 fitted and supported by each mating recess 14, 16 and each leading edge 11a, 12a of each pressure plate 11, 12 in a position intersecting the first reinforcing bar RB1 and by expanding each pressure plate 11, 12.
Furthermore, when the first reinforcing bar RB1 is inserted across each of the mating recesses 14, 16 and the second reinforcing bar RB2 is clamped and held in the clamping space SP, each of the locking members 21, 22 locks the first reinforcing bar RB1.

According to the reinforcing bar retainer 1 of this embodiment, each pressure plate 11, 12 elastically biased by the leaf spring portion 13 clamps and holds the second reinforcing bar RB2 in the clamping space SP and presses it against the first reinforcing bar RB1 in each fitting recess 14, 16, and each locking member 21, 22 locks the first reinforcing bar RB1, so that the cooperation of each pressure plate 11, 12 and each locking member 21, 22 can increase the holding force of the first reinforcing bar RB1 and the second reinforcing bar RB2.

<About the use of rebar holder 1>
Prior to a detailed description of the reinforcing bar holder 1, an explanation will be given of an object for which the reinforcing bar holder 1 is to be used, specifically, a reinforced concrete building 100. Fig. 2 is a cross-sectional view illustrating a column 100, a beam 120, a slab 130, and a wall 140 in the reinforced concrete building 100.
As described above, the reinforcing bar holder 1 is a tool for clamping and holding two reinforcing bars in a crossed state. In the building 100 with a reinforced concrete structure shown in FIG. 2, reinforcing bars are used as core materials 111, 121, 131, and 141 to reinforce concrete that is weak against tension. For example, in the column 100 and the beam 120, a plurality of main bars 112 and 122 are arranged along the longitudinal direction of the column 100 and the beam 120, and shear reinforcement bars (hoops 113 in the column 100 and stirrups 123 in the beam 120) are arranged in a direction intersecting the main bars 112 and 122. In the slab 130 and the wall 140, a plurality of reinforcing bars 132, 133, 142, and 143 arranged in a lattice pattern are used as the core materials 131 and 141.
In this embodiment, the main reinforcements 112, 122 and the reinforcing bars 132, 142 correspond to the first reinforcing bar RB1, and the tie bars 113, the stirrup bars 123 and the reinforcing bars 133, 143 correspond to the second reinforcing bars RB2.
When constructing a building 100 with a reinforced concrete structure, a formwork is set around the core members 111, 121, 131, and 141, unhardened concrete is poured into the formwork, and the formwork is removed after the concrete has hardened. By attaching the rebar holders 1 to the points where the rebars intersect before pouring the concrete, the inconvenience of the rebars becoming misaligned during pouring of the concrete is suppressed.

<Structure of reinforcing bar holder 1>
Next, a description will be given of the structure of the reinforcing bar retainer 1. Fig. 3(a) is a front view of the reinforcing bar retainer 1, Fig. 3(b) is a left side view of the reinforcing bar retainer 1, Fig. 3(c) is a right side view of the reinforcing bar retainer 1, Fig. 3(d) is a rear view of the reinforcing bar retainer 1, Fig. 3(e) is a plan view of the reinforcing bar retainer 1, and Fig. 3(f) is a bottom view of the reinforcing bar retainer 1.
As shown in Figure 3, the reinforcing bar holder 1 comprises a main body 10 which fits and holds the first reinforcing bar RB1 in each of the fitting recesses 14, 16, and which clamps and holds the second reinforcing bar RB2 which intersects with the first reinforcing bar RB1 in the clamping space SP, and locking members 20 (first locking member 21, second locking member 22) which are respectively supported by first and second support portions 15, 17 of the main body 10 and lock the first reinforcing bar RB1 fitted and held in each of the fitting recesses 14, 16.

<Regarding the main body 10>
The main body 10 is made of a thin elastic steel plate, for example, a steel plate having a thickness of 0.5 mm.
The main body 10 comprises a first pressure plate 11 arranged on the front side, a second pressure plate 12 arranged on the rear side, a leaf spring portion 13 arranged between the base edge 11b of the first pressure plate 11 and the base edge 12b of the second pressure plate 12 and elastically biasing each pressure plate 11, 12 so that the tip edge 11a of the first pressure plate 11 and the tip edge 12a of the second pressure plate 12 approach or abut each other, a first axial support portion 15 arranged on the first pressure plate 11 side and axially supporting the base end 21a of the first locking member 21, and a second axial support portion 17 arranged on the second pressure plate 12 side and axially supporting the base end 22a of the second locking member 22.

The first pressure plate 11 has a horizontally elongated rectangular shape with a horizontal (left-right) length of 50 mm and a vertical (tip-base) length of 32 mm, and is provided with a first fitting recess 14 cut out from the left-right center of the tip edge 11a toward the base end with a width equal to or slightly wider than the diameter of the first rebar RB1. The first fitting recess 14 has a width of 10 mm and a length of 25 mm, for example, and the innermost end is semicircular.
Cylindrical first support portions 15 are provided on both the left and right sides of the first fitting recess 14, continuing from the tip edge 11a of the first pressure plate 11. The first support portions 15 in this embodiment are provided by deforming the tip portion of a steel plate into a cylindrical shape, and have an inner diameter of, for example, 3 mm.
The inner diameter of the first pivot support portion 15 is set to a size that allows the base end portion 21 a of the first locking member 21 to be rotatably supported. The first pivot support portion 15 may be provided at a position near the tip end of the first pressure plate 11.

The second pressure plate 12 has a horizontally elongated rectangular shape like the first pressure plate 11, and has a second mating recess 16 provided from the left-right center of the tip edge 12a toward the base end, and a cylindrical second support portion 17 is provided on both the left and right sides of the second mating recess 16.
In this embodiment, the dimensions of the second pressure plate 12 are the same as those of the first pressure plate 11, the shape and dimensions of the second fitting recess 16 are the same as those of the first fitting recess 14, and the shape and dimensions of the second pivot support portion 17 are the same as those of the first pivot support portion 15, so detailed description will be omitted. Note that the shape and dimensions of each part of the second pressure plate 12 may be different from those of the first pressure plate 11.

The leaf spring portion 13 has a horizontal (left-right) length that is the same as the length of each pressure plate 11, 12, and a horizontally elongated rectangular shape whose vertical (front-rear) length is longer than the diameter of the second rebar RB2, and the vertical center 13c is curved in a concave shape toward the tip side compared to both end edges (front end edge 13a, rear end edge 13b). In this embodiment, for example, the horizontal length of the leaf spring portion 13 is 50 mm, the vertical length is 25 mm, and the maximum depth of the concave is 2 mm.
The front edge 13a of the leaf spring portion 13 is formed continuous with the base edge 11b of the first pressure plate 11, and the rear edge 13b is formed continuous with the base edge 12b of the second pressure plate 12. The boundary between the leaf spring portion 13 and the first pressure plate 11 and the boundary between the leaf spring portion 13 and the second pressure plate 12 are each curved, and the pressure plates 11, 12 are arranged so that the separation distance gradually decreases from the base edges 11b, 12b toward the tip edges 11a, 12a (in other words, the separation distance gradually increases from the tip edges 11a, 12a toward the base edges 11b, 12b).

The leaf spring portion 13 elastically biases the pressure plates 11, 12 so as to maintain the closed position in which the tip edges 11a, 12a of the pressure plates 11, 12 abut against each other when no external force is applied.
In the example of Figures 3 (b) and (c), when each pressure plate 11, 12 is in the closed position, the leading edges 11a, 12a of each pressure plate 11, 12 abut against each other, but when each pressure plate 11, 12 is in the closed position, the leading edges 11a, 12a may be spaced apart by a width less than the diameter of the second reinforcing bar RB2.
Although details will be described later, in the reinforcing bar holder 1 of this embodiment, a first reinforcing bar RB1 is inserted across each of the fitting recesses 14, 16, and a second reinforcing bar RB2 is arranged in a clamping space SP (see FIG. 6( a) ) that is located on the tip side of the first reinforcing bar RB1 and is defined by the inner surfaces of each of the pressure plates 11, 12. The second reinforcing bar RB2 in the clamping space SP is clamped and held by each of the pressure plates 11, 12.

<Regarding the Locking Members 21 and 22>
Each of the locking members 21, 22 in this embodiment is made by bending a steel wire into a predetermined shape, and locks the first reinforcing bar RB1 fitted in each of the fitting recesses 14, 16, and applies a force to each of the pressure plates 11, 12 to expand each of the tip edges 11a, 12a from the closed position against the elastic force of the leaf spring portion 13. Each of the locking members 21, 22 in this embodiment is made, for example, from round steel having a diameter of 2 mm, and the total length of each of the locking members 21, 22 is 68 mm.

The first locking member 21 on the first pressure plate 11 side will be described. The first locking member 21 includes a base end 21a rotatably supported by the first pivot support 15, a locking portion 21b provided at the tip end portion opposite the base end 21a and locking the first rebar RB1, and an intermediate portion 21c provided between the base end 21a and the locking portion 21c.
The base end 21a is provided along the left-right direction, and its length is approximately the same as or slightly shorter than the length of the first pivot support portion 15. Since the base end 21a is pivotally supported by the first pivot support portion 15, the first locking member 21 is supported so as to be rotatable along a track parallel to a plane perpendicular to the surface of the first pressure plate 11.
The locking portion 21b is a portion in which the steel wire is folded back into a substantially U-shape, and the first rebar RB1 is placed in the space on the inner circumference side. In this embodiment, the width W21 of the base end of the locking portion 21b (the width at the boundary position with the middle portion 21c) is narrower than the diameter of the first rebar RB1, and when the first rebar RB1 is locked in the locking portion 21b, the base end of the locking portion 21b is pressed against the first rebar RB1, thereby expanding the base end of the locking portion 21b and fitting into the locking portion 21b.
The intermediate portion 21c is a portion that connects the left and right inner ends of the base end portion 21a to the base end of the engagement portion 21b, and has a substantially straight shape when viewed from the front, with the tip portion bent forward at an obtuse angle when viewed from the side.

The first engaging member 21 having the above-described shape has a narrowed portion CS1 formed in the engaging portion 21b, the narrowed portion CS1 having a width narrower than the diameter of the first reinforcing bar RB1.
In this embodiment, the first retaining member 21 is made of a steel wire bent into a predetermined shape, and therefore can be easily manufactured. In addition, the first retaining member 21 is formed with the constricted portion CS1, which can prevent the first reinforcing bar RB1 from falling off the retaining portion 21b.

Next, the second locking member 22 on the second pressure plate 12 side will be described. Like the first locking member 21, the second locking member 22 has a base end 22a rotatably supported by the second pivot support 17, a locking portion 22b provided at the tip side portion opposite the base end 22a and locking the first rebar RB1, and an intermediate portion 22c provided between the base end 22a and the locking portion 22b.
The base end 22a, locking portion 22b, intermediate portion 22c, and constricted portion CS2 of the second locking member 22 have the same configuration as the base end 21a, locking portion 21b, intermediate portion 21c, and constricted portion CS1 of the first locking member 21, so description thereof is omitted.

Each of the locking members 21, 22 locks the first rebar RB1 in each of the locking portions 21b, 22b. The locking members 21, 22 are operated by the user when the leading edges 11a, 12a of the pressure plates 11, 12 are opened against the elastic force of the leaf spring portion 13. As described later in FIG. 4 and FIG. 5, when the locking members 21, 22 are rotated so that the locking portions 21b, 22b are positioned on the base end side of the main body portion 10, and the first locking portion 21b and the second locking portion 22b are brought close to each other, the base end edges 11b, 12b of the pressure plates 11, 12 become the fulcrums and the first shaft support portion 15 and the second shaft support portion 17 are separated, and the leading edge 11a of the first pressure plate 11 and the leading edge 12a of the second pressure plate 12 are opened.

<Installation procedure for rebar holder 1>
Next, a procedure for attaching the reinforcing bar holder 1 will be described. Figures 4(a) and 4(b) show the state before attachment, Figures 5(a) and 5(b) show the state after the pressure plates 11 and 12 have been opened and the reinforcing bar holder 1 has been moved halfway in the base end direction, Figures 6(a) and 6(b) show the state after the pressure plates 11 and 12 have been opened and the reinforcing bar holder 1 has been moved all the way in the base end direction, and Figures 7(a) and 7(b) are diagrams for explaining the state after the first reinforcing bar RB1 has been locked by the locking portions 21b and 22b of the locking members 21 and 22.

4(a) and 4(b), when attaching the reinforcing bar holder 1 to the first reinforcing bar RB1 and the second reinforcing bar RB2, the retaining members 21, 22 are rotated until the intermediate portions 21c, 22c of the retaining members 21, 22 are aligned with the outer surfaces of the pressure plates 11, 12. After that, the orientation of the reinforcing bar holder 1 is adjusted so that the first reinforcing bar RB1 is fitted into the fitting recesses 14, 16, and the reinforcing bar holder 1 is brought close to the reinforcing bars RB1, RB2.
As shown in Figures 5(a) and (b), the first rebar RB1 is fitted halfway into each fitting recess 14, 16, and the locking portions 21b, 22b of the locking members 21, 22 are moved closer together by the operator's fingers to open the gap between the leading edges 11a, 12a of the pressure plates 11, 12 larger than the diameter of the second rebar RB2, and the rebar holder 1 is moved so that the second rebar RB2 is positioned between the leading edges 11a, 12a of the pressure plates 11, 12.

As shown in Figures 6 (a) and (b), when the first reinforcing bar RB1 is inserted deep into each mating recess 14, 16, and the fingers are released from each mating portion 21b, 22b of each mating member 21, 22 to allow the elastic force of the leaf spring portion 13 to act on each pressure plate 11, 12, the second reinforcing bar RB2 in the clamping space SP is clamped by each pressure plate 11, 12 and pressed against the first reinforcing bar RB1 fitted and supported in each mating recess 14, 16.
7(a) and 7(b), the locking portions 21b, 22b of the locking members 21, 22 are rotated toward the first rebar RB1 around the base ends 21a, 22a of the locking members 21, 22. As described above, the widths W21, W22 of the boundaries (the constricted portions CS1, CS2) between the locking portions 21b, 22b and the intermediate portions 21c, 22c are narrower than the diameter of the first rebar RB1, so that the rotation of the locking members 21, 22 stops at the positions where the constricted portions CS1, CS2 rest on the first rebar RB1. When the locking portions 21b, 22b are pressed toward the first rebar RB1 from this stop position, the constrictions CS1, CS2 deform to conform to the outer circumferential surface of the first rebar RB1, and the first rebar RB1 is positioned on the inner circumferential side of the locking portions CS1, CS2. In this state, the constrictions CS1, CS2 return to their original positions due to their elasticity, and the first rebar RB1 is locked so that it does not easily come off the locking portions CS1, CS2.

The above procedure completes the holding of the reinforcing bars RB1, RB2 by the reinforcing bar holder 1. When the reinforcing bars RB1, RB2 are held by the reinforcing bar holder 1, the pressure plates 11, 12 elastically biased by the leaf spring portions 13 clamp and hold the second reinforcing bar RB2 in the clamping space SP and press it against the first reinforcing bar RB1 in each of the fitting recesses 14, 16, and the locking members 21, 22 lock the first reinforcing bar RB1. Therefore, the cooperation of the pressure plates 11, 12 and the locking members 21, 22 can increase the holding force of the first reinforcing bar RB1 and the second reinforcing bar RB2.
When releasing the reinforcing bars RB1 and RB2 from the reinforcing bar holder 1, the above-mentioned installation steps can be carried out in reverse order.

<About Modifications>
In the above embodiment, the reinforcing bar held by the reinforcing bar holder 1 is a reinforcing bar used as a core material in a reinforced concrete structure, but the reinforcing bar is not limited to this type of reinforcing bar. In other words, any reinforcing bar may be used as long as it is two reinforcing bars that are clamped and held in a crossed state.

In the above embodiment, the locking members 21 and 22 are made of steel wire with a tip that is folded back into a shape that allows the first rebar RB1 to be locked in the inner circumferential space, but the shape is not limited to this. In other words, it is sufficient that the locking members 21 and 22 are made into a shape that allows the first rebar RB1 to be locked.

[Summary of the embodiments, functions and effects of the present invention]
First embodiment
This embodiment relates to a reinforcing bar holder 1 that clamps and holds a first reinforcing bar RB1 and a second reinforcing bar RB2 in a crossed state, and includes a first pressure plate 11 and a second pressure plate 12 that are arranged so that their leading edges 11a, 12a are close to or in contact with each other and the distance between them gradually increases toward the other end edges 11b, 12b opposite the leading edges 11a, 12a, a leaf spring portion 13 (elastic biasing member) that elastically biases the pressure plates 11, 12 to maintain a closed position in which the leading edges 11a, 12a are close to or in contact with each other and holds the pressure plates 11, 12 so as to allow them to open from the closed position when an opening force against the elastic biasing force is applied, and a pivot support portion 15, 17 provided near the leading edges 11a, 12a of the pressure plates 11, 12 that pivots freely along a trajectory parallel to a plane perpendicular to the plate surface of the pressure plates 11, 12. The pressure plates 11, 12 each have a first engaging member 21 and a second engaging member 22 for engaging the first reinforcing bar RB1, and the central portion of each of the leading edges 11a, 12a of the pressure plates 11, 12 is provided with a first fitting recess 14 and a second fitting recess 16 that are cut out toward the other end edges 11b, 12b and can simultaneously fit and support the first reinforcing bar RB1. The first reinforcing bar RB1 and the pressure plates 11, 12 each have a first fitting recess 14 and a second fitting recess 16 that can simultaneously fit and support the first reinforcing bar RB1, and the first reinforcing bar RB1 and the pressure plates 11, 12 each have a first fitting recess 14 and a second fitting recess 16 that can simultaneously fit and support the first reinforcing bar RB1. The second reinforcing bar RB2 can be fitted into the clamping space SP between the leading edges 11a, 12a of the pressure plates 11, 12 in a position intersecting the first reinforcing bar RB1 and while the pressure plates 11, 12 are expanded, and when the first reinforcing bar RB1 is inserted across each of the fitting recesses 14, 16 and the second reinforcing bar RB2 is held in the clamping space SP, each of the engaging members 21, 22 engages the first reinforcing bar RB1.
According to the reinforcing bar holder 1 of this embodiment, each pressure plate 11, 12 elastically biased by the leaf spring portion 13 clamps and holds the second reinforcing bar RB2 in the clamping space SP and presses it against the first reinforcing bar RB1 in each mating recess 14, 16, and each locking member 21, 22 locks the first reinforcing bar RB1, so that the holding force of the first reinforcing bar RB1 and the second reinforcing bar RB2 can be increased by cooperation between each pressure plate 11, 12 and each locking member 21, 22.

Second embodiment
In the reinforcing bar retaining device 1 of this embodiment, each locking member 21, 22 is characterized in that each tip portion (each locking portion 21b, 22b) is made of steel wire folded back into a shape that allows the first reinforcing bar RB1 to be locked in the inner void.
According to the reinforcing bar holding portion of this embodiment, each of the locking members 21, 22 can be easily manufactured.

Third embodiment
In the reinforcing bar retainer 1 according to this embodiment, each locking member 21, 22 is characterized in that it has a narrowed portion (each locking portion CS1, CS2) at each tip portion (each locking portion 21b, 22b) whose width is narrower than the diameter of the first reinforcing bar RB1.
According to the reinforcing bar holding portion of this embodiment, the narrowed portion can prevent the first reinforcing bar RB1 from falling off the engaging portion 21b.

1...reinforcing bar holder, 10...main body, 11...first pressure plate, 11a...tip edge of first pressure plate, 11b...base edge of first pressure plate, 12...second pressure plate, 12a...tip edge of second pressure plate, 12b...base edge of second pressure plate, 13...leaf spring portion, 14...first mating recess, 15...first pivot support portion, 16...second mating recess, 17...second pivot support portion, 20...locking member, 21...first locking member, 21a...base end of first locking member, 21b... locking portion of first locking member, 21c... intermediate portion of first locking member, 22... second locking member, 22a... base end of second locking member, 22b... locking portion of second locking member, 22c... intermediate portion of second locking member, 100... reinforced concrete building, 110... column, 120... beam, 130... slab, 140... wall, SP... clamping space, CS1... narrowed portion of first locking member, CS2... narrowed portion of second locking member

Claims (3)

A reinforcing bar holder that clamps and holds a first reinforcing bar and a second reinforcing bar in a crossed state,
a first pressure plate and a second pressure plate arranged such that their leading edges are close to or in contact with each other and the distance between them gradually increases toward the other end edge opposite to the leading edges;
an elastic biasing member that elastically biases the first and second pressure plates so as to maintain a closed position in which the respective leading edges are close to or in contact with each other, and that holds the first and second pressure plates so as to allow them to open from the closed position when an opening force acts against the elastic biasing force;
a first locking member and a second locking member for locking a first reinforcing bar, each of which is pivotally supported by a pivot support provided near the leading edge of each of the first and second pressure plates along a track parallel to a plane perpendicular to the plate surface of each pressure plate;
The first and second pressure plates are provided at the center of each leading edge thereof with a first fitting recess and a second fitting recess, which are cut out toward the other end edge and can simultaneously fit and support the first reinforcing bar, respectively;
The second reinforcing bar can be fitted into a clamping space between the first reinforcing bar, which is fitted and supported by the first and second fitting recesses, and the leading edges of the first and second pressure plates, in a position intersecting the first reinforcing bar and while the first and second pressure plates are being expanded,
A reinforcing bar retainer characterized in that when the first reinforcing bar is inserted across the first and second mating recesses and the second reinforcing bar is clamped and held in the clamping space, each locking member locks the first reinforcing bar. The reinforcing bar retainer according to claim 1, characterized in that the first and second retaining members are made of steel wire whose tip is folded back into a shape that allows the first reinforcing bar to be retained in the inner peripheral space. The reinforcing bar retainer according to claim 2, characterized in that the first and second locking members have a constricted portion at the tip that is narrower than the diameter of the first reinforcing bar.

Images