JPH0744651Y2 - Joining structure of X-shaped bar assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a joining structure of an X-shaped reinforcing bar assembly incorporated in a reinforced concrete column or the like. More specifically, it will be described between a pair of upper and lower annular plates. , An X-shaped arrangement in which a main bar group tilted clockwise in a plan view and a main bar group tilted counterclockwise are arranged, and upper and lower ends of the main bar group are fixed to the annular plate, respectively. The present invention relates to a joint structure of a muscle tip assembly.

[Conventional technology]

When joining the X-shaped bar arrangement assembly vertically and concentrically,
Conventionally, as shown in FIG. 8 and FIG. 9, the X-shaped bar arrangement assembly A has the upper and lower end portions 3a, 3b ..., 4a, 4b.
Main rods 3 of the X-shaped bar arrangement assemblies A, A that are configured so that they project above and below the annular plates 1 and 2, and are stacked up and down.
..., 4 ... The protruding ends 3a, 3b ..., 4a, 4b ... of the group were joined together by a mechanical joint B ... such as a crimp joint. Reference numeral 5 indicates pillar concrete, and 6 indicates beam concrete.

[Problems to be solved by the device]

In the above-mentioned conventional example, since the main bars 3 ..., 4 ... of the X-shaped bar arrangement assembly are connected to each other, if the accuracy of the X-shaped bar is low, the connection cannot be made. In manufacturing the pre-assembled product, strict precision was required, and the manufacture was difficult. Further, since a large number of main bars 3 ..., 4 ... are joined one by one with the mechanical joint B ..., the number of members is large and the joining work on site is troublesome.

In view of the above-mentioned conventional drawbacks, the present invention provides a joining structure for an X-shaped reinforcing bar assembly, which does not require much accuracy of the X-shaped reinforcing bar assembly and simplifies the bonding work. It is what

[Means for Solving the Problems]

The technical means taken by the present invention to achieve the above object are as follows. That is, in the joining structure of the X-shaped reinforcing bar assembly according to the present invention, between the pair of upper and lower annular plates, the upper and lower ends are in a vertical or substantially vertical posture, and the other portions are in a slanted posture. A main bar group in which a plurality of main bars formed by bending both ends of a reinforcing bar of the book are tilted in a clockwise direction in a plan view, and the upper and lower ends are in a vertical or substantially vertical posture, and the other portions are in a diagonal posture. To be 1
Arranging a plurality of main bars formed by bending both ends of a reinforcing bar in a counterclockwise direction in plan view and arranging a main bar group, and the vertical or substantially vertical upper and lower end portions of the main bar group, respectively. The present invention is characterized in that X-shaped reinforcing bar preassemblies formed by welding in a state where the annular plate does not protrude vertically are stacked on the side surface of the annular plate, and vertically adjacent annular plates are welded to each other.

As the X-shaped reinforcing bar assembly, a pair of vertical X-shaped structural surfaces formed by two main bars intersecting with the X-shape are symmetrically arranged at equal distances from the center line of the annular plate. One set of four unidirectional X-shaped reinforcements is arranged around the center line of the annular plate at intervals of three or more at appropriate intervals to form X-shaped reinforcements in two directions perpendicular to each other and in an oblique direction between them. It is desirable that the multi-direction X-shaped bar be arranged.

In addition, it is desirable to wrap concrete restraining hoop reinforcement around the X-shaped reinforcement arrangement.

[Action]

According to the above configuration, the upper and lower end portions have a vertical or substantially vertical posture, and the other portions have a diagonal posture.
Vertical or nearly vertical up and down of the main rebar group (main bar group tilted clockwise in plan view and main bar group tilted counterclockwise in plan view) composed of main bars formed by bending both ends of the book Since both ends are welded to the side surfaces of the pair of upper and lower annular plates, the welding margin between the main bar group and the annular plate can be long, and a robust X-shaped bar arrangement assembly can be obtained. Since the annular plates of the pre-assembly are welded together, the X-shaped bar arrangement pre-assembling can be performed regardless of the bar arrangement accuracy of the main bar group, and compared to the case where the main bars are connected one by one with a mechanical joint. Since the number of members is small, the on-site joining work can be simplified.

The X-shaped reinforcing bar assembly is formed by symmetrically arranging a pair of vertical X-shaped structural planes formed by two main bars intersecting with the X-shape and equidistant from the center line of the annular member. This one set of unidirectional X-shaped reinforcements is arranged around the center line of the annular plate at an appropriate interval of 3 or more to form X-shaped reinforcements in two directions perpendicular to each other and in an oblique direction between them. When the direction X-shaped bar is arranged, the X-shaped bar is opposed to the horizontal external force from any of the front-back, left-right, and diagonal directions.

By winding the concrete restraining hoop reinforcement around the X-shaped reinforcing bar assembly, a so-called confined concrete in which the periphery is constrained by the X-shaped reinforcing bar assembly is formed and cracks occur. However, the compressive strength of concrete is not lost, and the toughness is significantly improved.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention. In the figure, A is an X-shaped reinforcing bar assembly, which is inclined between the pair of upper and lower annular plates 1 and 2 in a counterclockwise direction with a group of six main bars 3 ... The main bars 3 ..., 4 ... Group of the main bars 3 ..., 4 ... and the vertical or substantially vertical upper and lower end portions 3a, 3b ..., 4a, 4b ... of the main bars 3 ... It is configured to be fixed to the side surface by welding. More specifically, each of the main bars 3 and 4 has both ends of one rebar (which may be round steel, but is preferably deformed bar or threaded bar) within the same plane. , Which are bent in opposite directions by a predetermined angle, the upper and lower end portions 3a, 3b ..., 4a, 4b ... of the main bars 3, 4 have a vertical or substantially vertical posture, and the other portions have an oblique posture. There is. The main bars 3 ... Group and the main bars 4 ... Group are arranged at regular intervals at positions on concentric circles having different diameters by the thickness of the annular plates 1 and 2, and one main bar 3 ... (or 4 ... ) Vertical or substantially vertical upper and lower end portions 3a, 3b ... (or 4)
a, 4b ...) are welded to the outer surfaces of the annular plates 1 and 2, and the vertical or substantially vertical upper and lower end portions 4a, 4b ... (or 3a, 3b ...) of the other main bar 4 ... (or 3 ...) group are The inner surfaces of the annular plates 1 and 2 are welded so as not to project above and below the annular plates 1 and 2.

The X-shaped reinforcing bar assembly A is joined by welding the vertically adjacent annular plates 2 and 1 to each other, as shown in FIG. That is, after the X-shaped reinforcing bar assembly A is carried into the site, built in the column construction position and the legs are fixed, the same X-shaped reinforcing bar assembly A is placed on the X-shaped reinforcing bar assembly A. When joining the body A, as shown in the drawing, the X-shaped reinforcing bar assemblies A, A are vertically stacked and the vertically adjacent annular plates 2,
Weld one W over the entire circumference.

In FIG. 2, 5 is column concrete, 6 is beam concrete,
Reference numeral 7 indicates a column main bar arranged vertically, and 8 indicates a beam main bar. The hoop muscles on the outer circumference of the column main muscles 7 are omitted in the drawing.

When welding the annular plates 2 and 1 to each other, the upper and lower annular plates 2 and 1 may be butted against each other and welded W. As shown in FIG. The small-diameter cylindrical portion 1a fitted into the annular plate 2 may be provided in series, and the small-diameter cylindrical portion 1a may be used as a backing for welding W.

4 to 6 show another embodiment of the present invention. In this embodiment, the X-shaped bar arrangement tip assembly A includes two main bars 3, which intersect with each other in X-shape.
A pair of vertical X-shaped structure surfaces formed by 4 and symmetrically arranged at equal distances from the center lines of the annular plates 1 and 2 to form a set of one-direction X-shaped reinforcing bars. , 3 sets (4 sets in the drawing) around the center line of 2 and 2 at regular intervals to form a multi-direction X-shaped arrangement that forms X-shaped reinforcement in two directions perpendicular to each other and in the diagonal direction between them. It is characterized by the fact that it is a muscle. The arrows in FIG. 5 indicate that the main bars 3 ..., 4 ... Diagonally rise from the bottom to the top. The bending points p ... of the upper ends of the main bars 3, ..., 4 are matched with the lower ends of the RC beam, and the bending points q of the lower end are matched with the upper ends of the RC beam. Other configurations are the same as those of the previous embodiment, and the welding W between the annular plates 2 and 1 may be the butt welding W similar to that of the previous embodiment, and the small-diameter tubular portion is used as the backing as in FIG. Welding W may be performed.

In the drawing, the main bars 3 ... Group welded to the inner side of the annular plates 1 and 2 incline clockwise in a plan view, and the main bars 4 ... Group welded to the outside incline counterclockwise. However, the inclination directions of the main muscle groups inside and outside the annular plates 1 and 2 may be opposite. In each of the above embodiments, X
Although the hoop muscles are not wound around the shape-reinforcing point assembly A, as shown in FIG.
By winding the concrete restraining hoop bars 9 around the X-shaped reinforcing bar assembly A, a so-called confined concrete in which the periphery is restricted by the X-shaped reinforcing bar assembly A is constructed. The toughness of the column can be further improved.

[Effect of device]

Since the present invention has the above-mentioned configuration, the following effects can be obtained.

Vertical or substantially vertical up and down of the main bar group composed of main bars formed by bending both ends of one rebar so that both upper and lower ends are in a vertical or substantially vertical posture and the other parts are in an oblique posture Since both ends are welded to the side surfaces of the pair of upper and lower annular plates, the upper and lower ends of the main bar group are positioned parallel to the axis of the annular plate, and the welding margin with the annular plate is long, resulting in robustness. A new X-shaped bar arrangement assembly is obtained, and since the upper and lower X-shaped bar arrangement assembly annular plates are welded together, the X-shaped bar arrangement assembly is joined regardless of the reinforcement accuracy of the main bar group. In particular, since the upper and lower ends of the main bar group do not project above and below the annular plate, the upper and lower ends of the main bar group do not get in the way when welding the annular plates, and the main bars are connected one by one. Fewer members compared to joining with mechanical joints , It is possible to simplify the joining operation in the field.

According to claim (2), in addition to the above effect, the multi-direction X-shaped bar arrangement allows the X-shaped bar to resist against horizontal external force from any of the front-back, left-right, and diagonal directions. Therefore, there is an effect that a large proof stress without directionality can be obtained.

According to claim (3), since the hoop reinforcement for concrete restraint is wound around the X-shaped reinforcing bar assembly, a so-called confined concrete whose periphery is restricted by the X-shaped reinforcing bar assembly is constructed. Even if cracks occur, the compressive strength of concrete is not lost and the toughness is significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an X-shaped bar arrangement assembly, FIG. 2 is a schematic side view of a joint structure, and FIG. 3 is a sectional view of the essential part. FIGS. 4 to 6 show another embodiment of the present invention. FIG. 4 is a perspective view of an essential part of an X-shaped bar arrangement assembly, and FIG. 5 is a plan view of an essential part of the X-shaped bar arrangement assembly. , FIG. 6 is a vertical side view of the joint structure. FIG. 7 is a schematic side view of a joining structure showing another embodiment of the present invention. FIG. 8 is a perspective view of a main part of an X-shaped bar arrangement assembly showing a conventional example, and FIG. 9 is a schematic side view of a joining structure showing a conventional example. A: X-shaped rebar tip assembly, W: welded, 1,2: annular plate, 3,4: main bar, 3a, 3b, 4a, 4b ... upper and lower ends.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Fukushima 5-12 Miyatsuka-cho, Ashiya-shi, Hyogo (56) Reference JP-A-1-99734 (JP, A) JP-A-63-75244 (JP, A) ) Actual development Sho 54-182509 (JP, U)

Claims (3)

[Scope of utility model registration request] 1. A main bar formed by bending both ends of a single reinforcing bar between a pair of upper and lower annular plates so that both upper and lower ends are in a vertical or substantially vertical posture and the other parts are in a diagonal posture. Bend both ends of one rebar so that a plurality of main bars are tilted clockwise in a plan view and the upper and lower ends are in a vertical or substantially vertical posture and the other parts are in a diagonal posture. Arranging a plurality of processed main bars and a main bar group that is tilted counterclockwise in plan view,
Vertically or substantially vertically upper and lower end portions of the main bar group are welded to the side surfaces of the annular plate without protruding upward and downward of the annular plate, and the X-shaped bar arrangement assembly is vertically stacked and adjacent to each other vertically. The joining structure of the X-shaped reinforcing bar assembly, wherein the annular plates are welded to each other. 2. An X-shaped reinforcing bar assembly is a pair of vertical X-shaped structural surfaces formed by two main bars intersecting with each other in X-shape, symmetrically spaced apart from the center line of the annular plate. One set of four unidirectional X-shaped bar arrangements are arranged around the center line of the annular plate at appropriate intervals, and X-shaped in two directions at right angles to each other and in an oblique direction between them. The joint structure of the X-shaped bar arrangement assembly according to claim 1, wherein the X-shaped bar is a multi-direction X-shaped bar that is a bar arrangement. 3. The joint structure for an X-shaped reinforcing bar assembly according to claim 1, wherein a hoop bar for restraining concrete is wound around the X-shaped reinforcing bar assembly.