JPH0530316U - Reinforcement end fixing structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an end anchoring structure for reinforcing bars, which has improved reinforcement performance, reliability, as well as reinforcement of reinforcing bars and concrete adhesion due to the diameter-increasing projections integrally formed on the ends of the reinforcing bars is there. [Structure] In the end fixing structure of the reinforcing bars 5, 15, 25 or 27 embedded in the RC or SRC concrete C, the diameter-expanding projections 6, 16, at the ends of the reinforcing bars 5, 15, 25 or 27, The feature is that 26 or 28 is integrally formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an end anchoring structure of a reinforcing bar embedded in concrete in a structure of RC structure (reinforced concrete structure) or SRC structure (steel frame reinforced concrete structure).

[0002]

[Prior Art]

 Conventionally, a structure of RC structure (reinforced concrete structure) or SRC structure (steel frame reinforced concrete structure) has a node (RC member) between each RC structure member (foundation, pillar, beam, floor slab, wall, etc.). The most common structure is a rigid frame structure in which the joints are treated as rigid, and in the rigid frame structure, the bonding performance and reliability at the nodes are extremely important issues. For example, the column-beam joint structure shown in FIG. 4 will be described. In the joint S between the column 31 and the beam 33, a large number of column main bars 32, beam lower end main bars 35, beam upper end main bars 37, and the like are complicatedly intersected. In particular, as shown in the figure, the ends of each beam lower end main bar 35 are arranged in a superposed manner in the joint S and form a bent part 35a so that the concrete adheres, that is, the reinforcing bar end. The fixing performance and reliability of the parts are improved.

[0003]

[Problems to be solved by the device]

 In the conventional structure for fixing the end portion of the rebar as described above, the bent portion is provided at the tip end thereof to improve the adhesion of concrete, that is, the fixing performance of the end portion of the rebar. In the narrow joint between the structural members (SRC structural members), a large number of reinforcing bars are intricately interlaced, so improving the anchoring performance of the reinforcing bar end and its reliability is an issue.

The present invention was developed to address the above-mentioned problems, and its purpose is to improve the bar arrangement performance by the diameter-increasing projections integrally formed at the end of the reinforcing bar. Along with this, there is a need to provide an anchoring structure for reinforcing bar ends that improves concrete adhesion, that is, anchoring performance and reliability of reinforcing bars.

[0005]

[Means for Solving the Problems]

 The present invention, in the structure of fixing the end portion of the reinforcing bar embedded in the RC or SRC concrete, facilitates the rebar arrangement and adheres the concrete by forming the diameter-expanding protrusion integrally at the end of the reinforcing bar. That is, the fixing performance and reliability of the reinforcing bar are improved.

[0006]

[Action]

 The diameter-increasing projections that are integrally formed at the end of the reinforcing bar significantly improve the adhesion of concrete, that is, the anchoring performance of the reinforcing bar, shorten the anchoring length of the reinforcing bar, facilitate the bar arrangement, and improve the construction performance. .

[0007]

【Example】

 FIG. 1 shows a first embodiment of the present invention, FIG. 2 shows a second embodiment of the present invention, and FIG. 3 shows a third embodiment of the present invention. In the first embodiment shown in FIG. 1, C is a RC part (reinforced concrete structure) or SRC structure (steel reinforced concrete structure) pillar or wall 1 which is constructed by casting in situ, and 3 is a pre-manufactured factory or the like. RCa or SRC made PCa (precast) concrete members such as beams, 5 is a reinforcing bar reinforced in PCa concrete member 3, S is a concrete for connecting columns and beams, and at the end of reinforcing bar 5 It has a structure for fixing the end portion of the reinforcing bar in which the enlarged diameter projection 6 is integrally formed.

The diameter-increasing protrusions 6 formed on the ends of the reinforcing bars 5 are integrally formed by expanding the diameter of the ends of the reinforcing bars into a hump shape by means such as forging and pressing. It is preferable that the diameter of the portion is formed to be about 2 to 3 times larger than the diameter of the reinforcing bar 5 as shown in the figure, and the protruding end of the reinforcing bar 5 of the PCa concrete member 3 is arranged on the column 1 as shown in FIG. Then, when concrete S and C are cast, the adhesive force of concretes S1 and C is greatly increased by the diameter-expanding protrusions 6 formed at the end of each rebar 5, and the rebar 5 is embedded in the pillar 1. The length, that is, the fixing length L can be remarkably shortened, and the required joining strength can be secured even in a relatively narrow joint such as RC (or SRC) concrete parts S and C, and excellent joining performance can be obtained. can get.

In the second embodiment shown in FIG. 2, when joining the PCa concrete column 11 and the PCa concrete beam 13, a diameter-expanding protrusion 16 is provided at the end of a reinforcing bar 15 used as a beam lower end main bar of the half PCa concrete beam 13. It is characterized in that it is integrally formed, and in the joint S, a large number of column main bars 12, reinforcing bars 15 (beam bottom main bars), reinforcing bars 17 (beam top main bars), etc. are arranged. The adhesive force of the concrete C is remarkably enhanced by the diameter-expanding projection 16 integrally formed at the end of the end portion, and the required adhesive force is secured even if the bent portion is not provided as shown in the figure, and the fixing length thereof is fixed. La can be remarkably shortened, the reinforcement of the joints S between the columns and the beams is easily performed, and excellent joint performance and reliability are obtained. Furthermore, in the third embodiment shown in FIG. 3, in the joining of the PCa concrete side pillar 21 and the PCa concrete beam 23, the diameter-expanding projection 26 is formed on the end portion of the reinforcing bar 25 used as the beam lower end main bar of the PCa concrete beam 23. Is characterized in that it is integrally formed, and the enlarged diameter projection 28 is integrally formed at the end of the reinforcing bar 27 used as the beam upper end reinforcing bar. The reinforcing bar 25 has a fixing length Lb, and the reinforcing bar 27 has The end portions are bent downward and shortened to the fixing length Lc, and the reinforcing bars are secured to secure the fixing force of each beam lower end main bar and each beam upper end main bar, and the same action and effect as described above can be obtained.

[0010]

[Effect of the device]

 The present invention has the above-described structure, and the diameter-increasing projections integrally formed at the end of the reinforcing bar significantly increase the adhesion of concrete, that is, the fixing force, and shorten the fixing length of the reinforcing bar, thus arranging the reinforcing bar. Facilitates the installation, improves the construction performance, and provides excellent fixing performance and reliability.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a side view mechanism diagram showing a second embodiment of the present invention.

FIG. 3 is a side view mechanism diagram showing a third embodiment of the present invention.

FIG. 4 is a side view mechanism diagram showing a conventional example.

[Explanation of symbols]

 5,15,25,27 Reinforcing bar 6,16,26,28 Expanding protrusion C Concrete

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiko Adachi 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation Ltd. (72) Katsumi Ohata 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo No. Taisei Construction Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An end fixing structure for a reinforcing bar embedded in RC or SRC concrete, wherein an expanding projection is integrally formed at an end of the reinforcing bar. .