JPH0535924U - Joint structure of column main bar - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a joint structure of a column main bar that is excellent in workability, can obtain a high-quality joint, and can be applied to a large-diameter reinforcing bar. [Structure] The column 1 has a reinforced concrete structure, and is composed of a plurality of column main reinforcements 2 and shear reinforcement reinforcements 3 to form a skeleton, and is embedded in concrete 10. Each pillar main bar 2 constitutes a butt joint. Then, the steel plate member 4 is arranged in a state of surrounding the periphery of this joint portion. A hole 40 is formed on each surface of the steel plate member 4.
Many are provided. The diameter d of the hole 40 is preferably approximately twice the diameter of the aggregate contained in the concrete 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a butt joint structure of column main bars, and more particularly to a joint structure of column main bars in which the periphery of the joint section is surrounded by a steel plate member.

[0002]

[Prior Art]

 As is well known, in the construction of concrete structures, especially in the construction of reinforced concrete columns, it is necessary to appropriately add column reinforcing bars of a prescribed length. The joints include pressure-welded joints, lap joints, and butt joints.In this case, reinforcements such as reinforcing bar cages and steel plate members are used to surround the joints for reinforcement to improve the yield strength. . For example, Japanese Utility Model Laid-Open No. 1-92413 (E04C 5/06) uses a reinforcing bar cage, and Japanese Utility Model Laid-Open No. 61-110713 (E04C 5/06) proposes reinforcing steel plates.

[0003]

[Problems to be solved by the device]

 By the way, as a joint method, there was a problem that the construction of the pressure-welded joint requires special skill and skill, and the quality is easily influenced by the weather, and it is difficult to obtain a high-quality joint. On the other hand, lap joints require extra rebar length for the overlap margin of rebar, which inevitably increases the cost, and because the shape of the lap joint is maintained due to the tight binding of the wire, it is possible to connect with large diameter rebar. It was not applicable because the condition was difficult to maintain.

The present invention has been made in view of the above circumstances, and an object thereof is excellent in workability, a high-quality joint can be obtained, and it can be applied to a large-diameter reinforcing bar. It is to provide a joint structure of a column main bar that can be formed.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is characterized in that a steel plate member having a hole having a diameter approximately twice that of an aggregate is arranged around a butt joint portion of a column main bar.

Further, the present invention is characterized in that a steel plate member having a hole is arranged on the outer peripheral portion of the reinforced concrete column so as to correspond to the position of the butt joint portion of the column main bar.

[0007]

[Action]

 The operation of the present invention will be described. By adopting a butt joint and arranging a steel plate member having a hole around this joint or on the outer periphery of the reinforced concrete column, corresponding to the position of the joint, the space between the columns The axial force to be transmitted to the concrete will be transmitted through the surrounding concrete and steel plate.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view showing a preferred embodiment of a joint structure of a column main bar according to the present invention. The figure shows the concrete structure columns vertically broken.

The pillar 1 has a reinforced concrete structure, and the cross section of the pillar 1 is formed into a substantially rectangular shape by the concrete 10. In the concrete 10, main pillar reinforcements 2 and shear reinforcement reinforcements 3 are appropriately embedded. That is, a plurality of column main reinforcements 2 are arranged in the longitudinal direction of the column 1, and a plurality of shear reinforcement reinforcements 3 are arranged in an annular shape surrounding the periphery of the column main reinforcements 2.

A so-called deformed bar is adopted as the column main bar 2 of this embodiment, and a large number of annular convex portions are formed over the entire length. Each of the column main bars 2 is formed by vertically joining deformed reinforcing bars of a predetermined length, and ends thereof are butted against each other. The steel plate member 4 is disposed in the joint portion so as to surround the periphery.

As shown in FIG. 2, the steel plate member 4 is formed in a tubular shape having a substantially rectangular cross section corresponding to the column 1 having a substantially rectangular cross section, and a large number of holes 40 are provided on each surface thereof. Has been. In the present embodiment, the steel plate member 4 is embedded along the outer periphery of the concrete 10 at the joint position, and the surface thereof is exposed in a flush state. As the arrangement of the steel plate member 4, the steel plate member 4 may be completely embedded in the concrete 10 so as to surround the joint portion.

Each hole 40 has a diameter d that is approximately twice as large as the aggregate included in the concrete 10. Further, the shape of these holes 40 may be arbitrary such as circular, square, elliptical, and long hole-shaped, and the arrangement thereof may be appropriately set such as staggered. For example, if the hole 40 is formed by stamping, burr or curling occurs due to the processing, and as a result, good adhesion and engagement with the concrete 10 can be achieved.

It should be noted that it is not necessary to dispose the shear reinforcing bar 3 at the joint portion inside the steel plate member 4. This is because the steel plate member 4 also functions as shear reinforcement.

By the way, in the present embodiment, the periphery of the joint is surrounded by the steel plate member 4 having the holes 40, and as shown in the enlarged view of FIG. The axial force is transmitted through the concrete 10 and the steel plate member 4. Specifically, the axial force F of the column main bar 2 on the upper side is transmitted to the surrounding concrete 10 by the wedge action of the column main bar 2, and the concrete 10 has shear resistance. Since the steel plate member 4 is transmitted to the hole 40 and the steel plate member 4 is integrated with the concrete 10 at that portion, it is eventually transmitted to the steel plate member 4. Then, the axial force f is similarly transmitted from the steel plate member 4 to the column main bar 2 on the lower side.

Since the large number of holes 40 of the steel plate member 4, that is, the diameter d is approximately twice as large as the aggregate, the concrete 10 can sufficiently enter and adhere well, and both can be firmly integrated. it can. Therefore, the joint portion can be reinforced by the steel plate member 4.

[0016]

[Effect of the device]

 As described in detail above, according to the joint structure of the column main bar according to the present invention, a butt joint is adopted, and the joint position is provided around this joint part or on the outer peripheral part of the reinforced concrete column, corresponding to the joint position. By disposing the steel plate member having the holes, the axial force to be transmitted between the pillar main bars can be transmitted through the surrounding concrete and the steel plate. Therefore, it does not require skill for work unlike the pressure welded joint, and is excellent in workability. Also, since it does not require the overlap margin of the rebar unlike the lap joint, it can be applied to large diameter rebar. Furthermore, the periphery of the joint part or the concrete outer periphery of the joint part is surrounded by a steel plate, and at this time, concrete enters a large number of holes in the steel plate, so that the attachment is good, and both can be firmly integrated, and for shear reinforcement. Can also be contributed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a steel plate member.

FIG. 3 is an enlarged cross-sectional view of an essential part of a joint portion for explaining the transmission of an axial force.

[Explanation of symbols]

 2 Pillar reinforcement 4 Steel plate member 10 Concrete 40 holes

Claims (2)

[Scope of utility model registration request] 1. A joint structure of a column main bar, wherein a steel plate member having a hole having a diameter approximately twice that of an aggregate is arranged around the butt joint of the column main bar. 2. A joint portion structure of a column main bar, wherein a steel plate member having a hole is arranged on an outer peripheral portion of a reinforced concrete column so as to correspond to a position of a butt joint portion of the column main bar.