JP2008184847A - Reinforcement joining tool and reinforced concrete structure using this joining tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely joint mutual reinforcements without reducing workability, even when mutual these joining end parts are positionally dislocated when joining the mutual reinforcements. <P>SOLUTION: This reinforcement joining tool 1 is composed of two end parts 5 and 5 respectively joined to the joining end parts of the two reinforcements 3 and 3 projecting from a joining edge part of PC floorboards 2 and 2 via sleeves 4 and 4, and a positional dislocation absorbing part 6 extended between the end parts. The positional dislocation absorbing part 6 is constituted by being formed in a hoop shape, and is constituted so that large positional dislocation can be absorbed as a whole, even if a strain caused in a material is the same, by lengthening the material length participating in absorption of positional dislocation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a reinforcing bar joint applied when reinforcing bars are joined together, and a reinforced concrete structure using the same.

  Reinforcing bars, which are the main components of reinforced concrete structures (RC structures) and steel-framed reinforced concrete structures (SRC structures), are processed to a predetermined length in consideration of workability when placing the reinforcing bars, so the reinforcing bars are joined together on site. The work to do becomes indispensable.

  There are various types of methods for joining the reinforcing bars, such as lap joints, mechanical joints, gas pressure welding joints, and the like.

  Here, in the case of joining two reinforcing bars to be joined, these reinforcing bars may already be embedded in the concrete during the joining work. For example, when precast concrete (hereinafter referred to as PC) floor boards are joined together, after the PC boards are installed at predetermined positions, the concrete is placed between the joining edges and joined together. It is necessary to join the reinforcing bars protruding from the joining edge.

JP 54-84306 A Japanese Patent No. 3197079

  However, since these rebars are embedded in the concrete at their base ends, if the positions of the protruding joint ends deviate by, for example, about 5 mm, they are called on-site rebar repairs. Where it is necessary to perform bending, such a reworking not only takes time for itself, but also during bending, there is a concern that stress will concentrate on the PC floor plate where the reinforcing bar protrudes and the concrete will be damaged. .

  Here, in order to prevent misalignment, it is only necessary to improve the bar arrangement accuracy during the production of precast concrete or to improve the installation accuracy of the PC floor board. However, the manufacturing cost of the PC floor board increases accordingly. Or other problems such as high cost of PC installation work.

  In addition, with respect to the reinforcing bar of such a PC floor plate, a technique of joining by welding (Patent Document 1) or joining using a hollow pipe and a wedge body (Patent Document 2) is known. It was inherently difficult to cope with the displacement of the joining end.

  The present invention has been made in consideration of the above-described circumstances. Even when the joining ends of the reinforcing bars are misaligned with each other, the working efficiency is reliably reduced without lowering the working efficiency. It is an object of the present invention to provide a reinforcing bar joint that can join reinforcing bars to each other and a reinforced concrete structure using the same.

  In order to achieve the above object, a reinforcing bar joint according to the present invention is a reinforcing bar joint for joining two reinforcing bars whose joint end portions are opposed to each other, as described in claim 1, It is composed of two end portions that are respectively joined to the joining end portions of the two reinforcing bars, and a misalignment absorbing portion that extends between the end portions. The misalignment absorbing portion absorbs the misalignment of the joining end portion that occurs along the direction orthogonal to the material axis.

  In the reinforcing bar joint according to the present invention, the misalignment absorbing portion is configured such that the bending rigidity of the misalignment absorbing portion is smaller than the bending rigidity of the reinforcing bar.

  In the reinforcing bar joint according to the present invention, the misalignment absorbing portion is formed by bending a steel bar or forming a hoop.

  Moreover, the reinforced concrete structure using the reinforcing bar joint according to the present invention is the vicinity of the misalignment absorbing portion constituting the joint according to any one of claims 1 to 3, as described in claim 4. A reinforcing material is disposed on the reinforcing material and the displacement-absorbing portion is constrained with concrete.

  The reinforcing bar joint and the reinforced concrete structure using the same according to the present invention include two end portions respectively joined to the joining end portions of the two reinforcing bars, and misalignment absorption extended between the end portions. The misalignment absorbing portion absorbs misalignment in the material axis direction generated at the joining end portion of the reinforcing bar or in the material axis orthogonal direction perpendicular to the material axis direction.

  Therefore, even if the joining end portions of the reinforcing bars are misaligned, the reinforcing bars can be easily joined by the joining tool according to the present invention.

  In addition, after joining the reinforcing bars, the joining tool according to the present invention forms a reinforced concrete structure together with the reinforcing material arranged in the vicinity of the misalignment absorbing portion and the concrete placed around the reinforcing material.

  Accordingly, the tensile force acting on the reinforcing bars is transmitted to each other via the reinforced concrete structure, and thus the position displacement of the reinforcing bars is absorbed without impairing the transmission function of the tensile force acting on the reinforcing bars. Reinforcing bars can be easily joined.

  For example, the misalignment absorbing portion may be configured such that its bending rigidity is smaller than the bending rigidity of a reinforcing bar, or a steel rod is bent or formed into a hoop shape. In such a configuration, the former increases the misalignment absorbing capability by reducing the rigidity of the material itself constituting the misalignment absorbing portion, and the latter increases the length of the material involved in misalignment absorption. Increases the ability to absorb misalignment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a reinforcing bar connector and a reinforced concrete structure using the same according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

  FIG. 1 is a view showing a reinforcing bar joint according to the present embodiment. As can be seen in the figure, the reinforcing bar joint 1 according to the present embodiment is a joint edge of the PC floor plates 2 and 2 via sleeves 4 and 4 and a wedge (not shown) which are a kind of mechanical joint. It is comprised from the two edge parts 5 and 5 each joined to the joining edge part of the two rebars 3 and 3 which protrude from A, and the position shift absorption part 6 extended between this edge part.

  Here, the connector 1 is formed by processing the center of the deformed reinforcing bar having the same diameter as that of the reinforcing bars 3 and 3 into a hoop shape so that the center portion becomes the misalignment absorbing portion 6 and ends 5 extending on both sides thereof. 5 are end portions 5 and 5 which are joined to the reinforcing bars 3 and 3 via the sleeves 4 and 4, respectively.

  As described above, the misalignment absorbing portion 6 is formed in the shape of a hoop, and by increasing the length of the material involved in misalignment absorption, even if the degree of distortion generated in the material is the same, As described above, a large misalignment can be absorbed.

  The connector 1 according to the present embodiment forms a reinforced concrete structure 9 together with a reinforcing material 7 made of deformed reinforcing bars arranged in the vicinity of the misalignment absorbing portion 6 and concrete 8 placed around the reinforcing material 7.

  In this case, the reinforcing member 7 is formed in a U shape, and is provided and bound so as to straddle between the adjacent loop-shaped misalignment absorbing portions 6 and 6.

  The reinforcing bar joint 1 and the reinforced concrete structure 9 using the same according to the present embodiment include two end parts 5 and 5 respectively joined to the joining end parts of the two reinforcing bars 3 and 3, The misalignment absorbing portion 6 extends between the misalignment absorbing portion 6, and the misalignment absorbing portion deforms the misalignment in the direction perpendicular to the material axis generated at the joining end of the reinforcing bars 3 and 3. To absorb as shown in FIG.

  The figure (a) shows a state where the position deviation ΔH along the in-plane direction of the PC floor board 2 is absorbed, and the figure (b) shows a state where the position deviation ΔV along the thickness direction is absorbed. is there.

  As described above, according to the reinforcing bar joint 1 according to the present embodiment and the reinforced concrete structure 9 using the same, even if the joint ends of the reinforcing bars 3 and 3 are misaligned, the reinforcing bars are connected to each other. Can be easily joined by the joining tool 1.

  In addition, after joining the reinforcing bars 3, 3, the connector 1 forms the reinforced concrete structure 9 together with the reinforcing material 7 arranged in the vicinity of the misalignment absorbing portion 6 and the concrete 8 placed around the reinforcing material 7. Become.

  Accordingly, the tensile forces acting on the reinforcing bars 3 and 3 are transmitted to each other via the reinforced concrete structure 9, and thus, the transmission function of the tensile forces acting on the reinforcing bars 3 and 3 is not impaired. It is possible to easily join the reinforcing bars in a state in which the position shift of 3 is absorbed.

  In this embodiment, for convenience of explanation, the end portions 5 and 5 of the connector 1 are joined to the two rebars 3 and 3 protruding from the PC floor plates 2 and 2 via sleeves 4 and 4 which are mechanical joints. Although it joined to each edge part, the joining means of the edge parts 5 and 5 of the connector 1 and the joining edge part of the reinforcing bars 3 and 3 is arbitrary, for example, other than a mechanical joint, for example, grout They may be joined with a type joint or a welded joint.

  Moreover, in this embodiment, although the reinforcement was illustrated as the reinforcing material 7, it does not specifically limit to it, For example, when floor boards are mounted on the flange of H-shaped steel, the stud was welded to the flange upper surface. It may be a thing.

  In the present embodiment, the misalignment absorbing portion 6 is formed by processing the center of the deformed reinforcing bar, which is a steel rod, into a hoop shape. However, the misalignment absorbing portion according to the present invention has any shape. Processing is optional. Furthermore, it is possible to cope with the case where the misalignment is caused such that the ends of the two reinforcing bars 3 and 3 protruding from the joint edge of the PC floor plates 2 and 2 overlap each other.

  FIG. 3 shows a modification of the misalignment absorbing portion according to the present invention, and the misalignment absorbing portion 6a shown in FIG. 3 (a) is configured such that a plurality of hoops similar to the misalignment absorbing portion 6 are stacked. Formed.

  Further, the misalignment absorbing portion according to the present invention does not necessarily have to be formed in a hoop shape as in the above-described embodiments and modifications, and instead of this, a steel rod may be bent.

  The misregistration absorbing portions 6b, 6c, and 6d shown in FIGS. 3C to 3D are formed in a semicircular shape, a saw blade shape, and an S shape, respectively. Even in such a modified example, since the material length becomes long, the entire absorbable dimension can be increased with the same strain without particularly reducing the material rigidity. In addition, about the S-shaped thing illustrated, it uses when the positions of the reinforcing bars to be joined are largely shifted in the direction perpendicular to the material axes.

  Moreover, in this embodiment and the modification mentioned above, although the steel rod was formed in the non-linear form, it was made to absorb the position shift of the reinforcing bars joined, but it replaces with this and bending rigidity has the reinforcing bar 3 , 3 may be formed to be smaller than the bending rigidity. As a method for reducing the bending rigidity, a method of reducing the cross section, plastically deforming, or softening by thermal processing can be employed.

  FIG. 4 is a view showing a reinforcing bar joint according to another embodiment. In this case, a plurality of hoop-like reinforcing members 10 are arranged in the vicinity of the misalignment absorbing portion 6, but the other configurations are the same as those in the above embodiment.

  Further, in this embodiment, the reinforcing bars 3 and 3 embedded in the PC floor board are set as objects to be joined, so that the PC floor board placement error and the PC floor board manufacturing accuracy error are absorbed. The tool 1 is not intended to use only such a PC member, but can also be applied when joining reinforcing bars arranged on site.

  In such a case, it is possible to absorb the reinforcing bar arrangement error in the field.

BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed the joint tool of the reinforcing bar concerning this embodiment, and the reinforced concrete structure using the same, (a) is a top view, (b) is a side view. The figure explaining the effect | action of the coupling tool of the reinforcing bar which concerns on this embodiment. The figure which showed the reinforcing-bar joint tool which concerns on a modification. It is the figure which showed the jointer of the reinforcing bar which concerns on other embodiment, and the reinforced concrete structure using the same, (a) is a top view, (b) is a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rebar connector 3, 3 Rebar 5, 5 End part 66a, 6b, 6c, 6d Misalignment absorption part 7 Reinforcement material 8 Concrete 9 Reinforced concrete structure

Claims (4)

A rebar jointer for joining two rebars whose joint end portions are opposed to each other, extending between the two end portions respectively joined to the joint end portions of the two rebars The misalignment absorbing portion is a misalignment of the joining end portion that is formed along the material axis direction of the reinforcing bar or the material axis orthogonal direction perpendicular to the material axis direction. Reinforcing bar joint, characterized in that it is absorbed by the part. The reinforcing bar joint according to claim 1, wherein the misalignment absorbing portion is configured such that a bending rigidity of the misalignment absorbing portion is smaller than a bending stiffness of the reinforcing bar. The reinforcing bar joint according to claim 1, wherein the misalignment absorbing portion is formed by bending a steel bar or forming a hoop shape. A reinforcing material is disposed in the vicinity of the misalignment absorbing portion constituting the connector according to any one of claims 1 to 3, and the reinforcing material and the misalignment absorbing portion are constrained by concrete. Reinforced concrete structure.

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