JPH0826617B2 - Reinforcing bar structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reinforcing bar arrangement structure in a reinforced concrete column constituted by main bars and reinforcing bars.

2. Description of the Related Art As a conventional bar arrangement structure of this type, those shown in FIGS. 6 and 7 are known, and these will be described.

In FIG. 6 (a), a square hoop muscle 31 surrounds the main muscle 3 and is formed into a prismatic shape, and both ends of the square hoop muscle form hook portions 32 and are fastened to the main muscle 3 to form two hoop shapes. Core muscle 3
3, 33 ′ intersect in a cross shape, and are fastened to the main bar 3 by hook portions 34 provided at both ends.

FIG. 7 shows reinforcing bars 41, 4 arranged on the main bar 3 in a grid pattern.
2 is assembled and welded, and the joints of the reinforcing bars 41 and 42 are also welded.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, such a bar arrangement structure as shown in FIG.
In addition to the difficulty of work, the angle hoop muscles 31 and the core muscles 33, 33 'form a three-stage structure such as steps I, II, III as shown in Fig. 2B, and the distance between the muscles. There is a problem in that the flow of concrete is deteriorated by narrowing the space.

Further, in the structure shown in FIG. 7, it is difficult to make the lengths of the reinforcing bars 41 and 42 projecting outward from the main bar 3 the same, and since the lengths of the projecting portions are not the same, In the concrete, the thickness of the concrete, that is, the so-called cover thickness varies, and in other words, as the cover thickness, there is a problem that the effective thickness becomes smaller when the protruding length of the reinforcing bar is large.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional bar arrangement structure, to facilitate the assembling work, to form a three-stage structure, to prevent the flow of concrete from being deteriorated, and to further cover the concrete. The purpose of the present invention is to provide a bar arrangement structure that can keep the thickness constant and has a large proof strength against the force generated at the upper and lower ends of a column during an earthquake.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention is such that two structures, in which main bars are arranged and joined in the bent portions at both ends of a rectangular tubular first spiral reinforcing bar, are orthogonal to each other. Second spiral reinforcement having a main reinforcement connected to the inner periphery of a circular cylindrical second spiral reinforcement that intersects the first spiral reinforcement and is connected to the second spiral reinforcement. The radius of the muscle is
It is smaller than the longitudinal length of the first spiral reinforcing bar, the first spiral reinforcing bar crosses the second spiral reinforcing bar and extends laterally to the outside thereof, and the main bar of the first reinforcing bar is the second spiral reinforcing bar. It is characterized by being located outside the muscle.

Action Rectangular tubular first spiral reinforcement, circular tubular second
Pre-formed spiral reinforcements and transported to the construction site,
A pair of structures, in which main bars are arranged and joined to both end bending members of the first spiral reinforcing bar, are arranged orthogonally to form a first bar, and the second spiral reinforcing crosses the first spiral reinforcing bar. After arranging the muscles, both spiral reinforcements are connected, and the main reinforcement is connected to the inner circumference of the second spiral reinforcement.

Embodiment In the embodiment of the present invention shown in FIGS. 1 to 5, 1 in FIG. 3 shows a first bar arrangement, and this first bar arrangement 1 has a rectangular tubular shape as shown in FIG. 1 spiral reinforcement 2
A structure 5 in which the main bars 3 are arranged and joined in the bent portions 4 at both ends of the
Are arranged so as to be orthogonal to each other.

The second bar arrangement 6 in FIG. 2 is the circular tubular second part shown in FIG.
The spiral reinforcing bar 7 is provided, and the radius of the second spiral reinforcing bar 7 is smaller than one half of the longitudinal length of the first spiral reinforcing bar 2 as shown in FIG.
The second spiral reinforcing bar 7 as described above is connected to the first bar of the first bar arrangement 1.
Inserted while spirally rotating in the spiral reinforcing bar 2, connecting both spiral reinforcing bars 2 and 7, and further connecting the main bar 3 to the inner circumference of the second spiral reinforcing bar 7 to form the main bar 3 and the second spiral. The reinforcing bar 7 constitutes the second reinforcing bar 6.

In Fig. 1 and Fig. 2, 10 indicates the cast concrete, and the concrete column constructed in this way is
The concrete of the part surrounded by the main reinforcement 3 is effectively restrained by the second reinforcements 1 and 6, and as a result, against the force generated at the upper and lower ends of the column during an earthquake, the shear strength of the column is increased to prevent deformation. Ensure performance.

EFFECTS OF THE INVENTION This occurrence is as described above, and the main bar is arranged in the bent portions at both ends of the rectangular tubular first spiral reinforcing bar, and the two structures connected in the longitudinal direction are arranged orthogonally to each other. 1 bar arrangement and the first spiral reinforcing bar,
The main reinforcement is arranged on the inner periphery of the circular cylindrical second spiral reinforcement connected at this intersection, and the second reinforcement connected in the longitudinal direction.
And the diameter of the second spiral reinforcing bar is smaller than the longitudinal length of the first spiral reinforcing bar,
The first spiral reinforcing bar extends laterally to the outside of the second spiral reinforcing bar, and the main bar of the first reinforcing bar is located outside the second spiral reinforcing bar, so that when the concrete is placed, the first and second spiral reinforcing bars are reinforced. Due to the space formed between the streaks, the flow of concrete is good and no voids are generated, and the first and second reinforcements are closely embedded in the concrete with a small density and are buried. The spiral reinforcing bar is longitudinally connected to the main bars of the first bar located at both ends of the spiral reinforcing bar, the second spiral reinforcing bar is connected to the main bar of the second bar, and extends perpendicularly to the outside of the bar. It is connected to the first spiral reinforcing bar in the circumferential direction, and thus the second spiral reinforcing bar is firmly restrained by the main bars of the first spiral reinforcing bar and the second reinforcing bar. The vertical and horizontal cyclic loads are applied to the concrete columns, causing the initial horizontal deformation of the concrete in the second spiral reinforcing bar, and even if cracks occur, the interaction between the first and second reinforcing bars will be affected. Therefore, the shear reinforcement function acts on the entire column to prevent the generation of shear stress that gives a destructive force to the concrete column, and it is possible to prevent the column from having a shear stress in the horizontal direction other than the X and Y directions.
When an oblique force such as a degree is applied,
Due to the action of the spiral reinforcement, the shear reinforcement function acts on the entire column, and it is possible to prevent the shear stress that gives a destructive force to the concrete column due to the diagonal direction force, and thus the shear reinforcement function is prevented. There is an effect that a strong concrete column can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention in which concrete is partially cast, FIG. 2 is an enlarged plan view of the same as above, FIG. 3 is a perspective view of the first reinforcement of the same, and FIG. FIG. 5 is a perspective view of a part of the structure of the first reinforcing bar, FIG. 5 is a perspective view of a second spiral reinforcing bar of the second reinforcing bar, FIG. 6 shows a first conventional example, and (a) is a plan view thereof. FIG. 7 (B) is a cutaway reduced view taken along the line R-R of the above, and FIG. 7 is a plan view of the second conventional example. DESCRIPTION OF SYMBOLS 1 ... 1st reinforcement, 2 ... 1st spiral reinforcement 3 ... Main reinforcement, 5 ... Structure 6 ... 1st reinforcement, 7 ... 2nd spiral reinforcement

Claims (1)

[Claims] 1. A first reinforcing bar in which two structures, in which main reinforcing bars are arranged and connected in the bent portions at both ends of a rectangular cylindrical first spiral reinforcing bar, are arranged orthogonal to each other, and a circular cylindrical second spiral. A second reinforcing bar having a main bar arranged and coupled to the inner circumference of the reinforcing bar, wherein the diameter of the second spiral reinforcing bar is smaller than the longitudinal length of the first spiral reinforcing bar, and the first spiral reinforcing bar The muscle crosses the second spiral reinforcement and joins at this intersection, and extends laterally to the outside of the second spiral reinforcement, and the main reinforcement of the first reinforcement is located outside the second spiral reinforcement. Reinforcing bar structure characterized by.