JPH07571Y2 - Multi-directional X type assembly rebar - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a multi-directional X-shaped assembled reinforcing bar incorporated in an RC column or the like.

[Conventional technology]

An X-shaped bar arrangement structure for improving the toughness and shear strength of RC columns has already been known from JP-A-61-21269.

As shown in FIG. 8, this X-shaped reinforcing structure has an inner height H of the upper and lower floor beams so that four reinforcing bars a intersect at the column center height.
The space is arranged diagonally and diagonally with respect to the cross section of the column, and is assembled in the shape of a quadrangular pyramid-shaped three-dimensional truss. b is an assembled rebar truss, c is an annular steel plate having small holes at the four corners, and the vertical end of each rebar a is inserted into the small hole and is paired with the threaded part of the rebar a. The annular steel plates c are fixed to each other by tightly connecting the annular steel plates c from both sides with the nut d. “E” represents a columnar main muscle arranged in parallel, and “f” represents a hoop muscle.

[Problems to be solved by the invention]

 The above conventional example has the following problems.

(1) A reinforcing bar truss is constructed by arranging four reinforcing bars a diagonally between the inner heights H of the upper and lower floor beams so as to intersect at the central height of the pillar and diagonally to the cross section of the pillar. Therefore, when the number of the reinforcing bars a is increased so that the reinforcing bars a can be uniformly resisted in any direction, the reinforcing bars are densely packed in the central part of the column, and the filling property of the concrete in the central part of the column is deteriorated.

(2) Even if the number of reinforcing bars a is increased, a circular void that is inscribed in the reinforcing bar group a in a plan view is formed in the central part of the pillar so that the central part of the pillar can be filled with concrete. When reinforced, the reinforcing bar group a has a twisted shape in one direction (clockwise direction or counterclockwise direction) in a plan view, and there is no node (reinforcing bar crossing the X shape) of the reinforcing bar truss b. Therefore, the mechanical characteristics inherent to the X-shaped bar arrangement are impaired.

(3) As the reinforcing bar a, not only those having both ends threaded and threaded reinforcing bars are required, but also the annular steel plate c.
It was very troublesome to insert the reinforcing bar into the small hole that was formed in.

(4) At the upper and lower ends of the reinforcing bar truss, the vertical ends of the reinforcing bar a are connected to each other by the annular steel plate c, so that when concrete is poured, the concrete does not flow well below the annular steel plate c. However, there was a fear that concrete placement would be bad under the annular steel plate c.

The present invention is to provide a multi-directional X-shaped assembly rebar that can eliminate the above-mentioned conventional drawbacks.

[Means for solving problems]

The technical means taken by the present invention to achieve the above object are as follows.

That is, the multi-directional X-shaped assembled rebar according to the present invention comprises two rebars pre-bent so that the upper and lower ends are vertical bars and the middle part is a diagonal bar. A pair of X-shaped rebars that are made up of are arranged point-symmetrically to form a unidirectional X-shaped bar consisting of a set of four rebars, and a plurality of unidirectional X-shaped bars are arranged around the center line. And a vertical bar group at both upper and lower ends of an oblique bar group inclined clockwise in a plan view in each of the one-direction X type bar arrangements and a counterclockwise oblique line. The vertical muscle groups at the upper and lower ends of the diagonal muscle group are arranged with the tubular strip or the ring hoop muscle separated from each other, and are fixed to both side surfaces of the tubular strip or the ring hoop muscle. It has a feature.

[Action]

According to the above configuration, a pair of X-shaped rebars formed by intersecting two pre-bent rebars in an X shape are arranged point-symmetrically, and a unidirectional X-shaped bar consisting of a set of four rebars is arranged. Configure the bar arrangement,
Since a plurality of sets of the one-direction X-shaped reinforcements are arranged around the center line to form a multi-directional X-shaped reinforcement, a pair of Xs arranged in point symmetry so as to ensure the filling of the central portion with concrete.
Even if the distance between the shape reinforcements is set to be long and a circular void that is inscribed in the reinforcements is formed in the center of the reinforcements, the mechanical characteristics inherent to the X-shape reinforcement method are uniform in all directions. It will be demonstrated.

The connection between the reinforcing bars at the upper and lower ends of the multi-directional X-shaped assembled reinforcing bar is made up of the vertical reinforcing bar groups at the upper and lower ends of the diagonal reinforcing bar group tilted clockwise in plan view and the diagonal reinforcing bar groups counterclockwise tilted. The vertical strips at the upper and lower ends are arranged by separating the tubular strip or the ring hoop from each other, and are fixed by fixing to both side faces of the tubular strip or the ring hoop. The streaks do not collide with each other at the X-shaped intersection and are not bent, and the troublesome work of inserting the reinforcing bar into the small hole formed in the annular steel plate is also unnecessary.

Since the members that connect the reinforcing bars are tubular strips or ring hoop reinforcements, the width in the direction perpendicular to the centerline is narrow, and when placing concrete, the concrete below the tubular strips or ring hoop reinforcements Fillability is good and there is no risk of defective concrete placement.

〔Example〕

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

1 to 3 show an example of a multi-directional X-shaped assembled rebar according to the present invention, and FIG. 4 shows a rebar used for assembling the multi-directional X-shaped assembled rebar.

The multi-directional X-shaped assembled rebar is configured as follows.

That is, as shown in FIG. 4, the rebar is preliminarily bent so that the required number of bars are vertical bars 1a, 1a at the upper and lower ends and the oblique bar 1b at the middle. Multi-directional X built into RC columns
In the case of shaped rebar, the distance h between the vertical bars 1a and 1a is
It is set approximately equal to the inner height of the upper and lower beams.

A pair of X-shaped rebars formed by intersecting the above-mentioned two rebars and the diagonal bar 1b in an X-shape, and arranged in point symmetry to form a unidirectional X-shaped rebar A consisting of a set of four rebars. Constitute.

A plurality of sets (three sets in the illustrated embodiment, 12 rebars in total are used) of the one-direction X-shaped bar arrangement A are arranged around the center line, and planes are formed at both upper and lower ends. Oblique muscles 1b that are tilted clockwise in the visual direction ... Vertical muscles 1a at both upper and lower ends of the group, and diagonal muscles 1b that are tilted counterclockwise ...
Vertical strips 1a at the upper and lower ends of the group are arranged with the steel tubular strips B and B separated from each other, and welded W or adhesive is applied to both side surfaces of the tubular strips B and B. It is firmly fixed to form a multi-directional X-shaped rebar.

In FIG. 2, solid line arrows indicate diagonal stripes 1b ... Group tilted clockwise in plan view, and broken line arrows indicate diagonal stripes 1b ... Group tilted counterclockwise in plan view. There is. In other words, the direction of the arrow indicated by the solid line or the broken line indicates that the diagonal line 1b rises from the bottom to the top. In FIG. 2, the → rebar and the → rebar intersect in an X shape to form an X-shaped bar. Also, →
The X-shaped bar is formed by intersecting the X-shaped rebar with the rebar of → and the rebar of →, and a pair of four rebars (→
And →, → and →) constitute a unidirectional X-shaped bar arrangement A. Similarly, the → rebars and → rebars, → rebars and → rebars each form an X-shaped rebar, and a pair of four rebars (→ and →, → and →) The unidirectional X-shaped bar arrangement A is formed. Furthermore, → rebar and → rebar,
The → rebars and → rebars each form an X-shaped bar, and a pair of them constitutes a unidirectional X-shaped bar A consisting of a set of four rebars (→ and, → and →). is doing.

According to the above configuration, a pair of X-shaped rebars formed by intersecting two pre-bent rebars in an X-shape at the diagonal bar 1b ... A unidirectional X-shaped bar composed of the rebar of
Since multiple sets are arranged around the center line to form multi-direction X-shaped reinforcements, the distance between a pair of X-shaped reinforcements arranged point-symmetrically is set long in order to ensure the filling of concrete in the center. Then, even if the circular void C inscribed in the reinforcing bar group is formed in the central portion of the reinforcing bar group, the mechanical characteristics inherent to the X-shaped bar arrangement method are uniformly exerted in any direction.

The connection between the reinforcing bars at the upper and lower ends of the multi-direction X-shaped assembly reinforcing bar is counterclockwise with the diagonal reinforcing bars 1b ... group vertically slanting clockwise in plan view and the vertical bars 1a ... group at the upper and lower ends of the group. The diagonal strips 1b ... Vertical strips 1a at both upper and lower end portions of the group are arranged with the tubular strips B, B respectively, and the tubular strips B, B are arranged.
Since it is carried out by fixing it to both side surfaces, the diagonal bars 1b ... do not collide with each other at the X-shaped intersection and bend, and it is troublesome to insert the reinforcing bar into the small hole formed in the annular steel plate. Unnecessary work becomes unnecessary.

Further, since the member for connecting the reinforcing bars is the tubular strip plate B, the width in the direction perpendicular to the center line is narrow even if the vertical width of the tubular strip plate B is wide. The filling of the bottom of the strip B with concrete is good, and there is no risk of defective concrete placement.

In the drawing, diagonal lines 1b inclined in the clockwise direction in a plan view ... Vertical lines 1a in the upper and lower ends of the group are inclined in the counterclockwise direction on the outer side surfaces of the tubular strips B, B. The diagonal stripes 1b ... Vertical stripes 1a at the upper and lower end portions of the group are fixed to the inner side surfaces of the tubular strips B, B by welding W or an adhesive, respectively, but the relationship between the inside and the outside is reversed, that is, the clock. Diagonal stripes 1b inclined in the direction of rotation ... Vertical stripes 1a at the upper and lower ends of the group ... Group on the inner surface of the tubular strips B, B,
It is needless to say that the vertical stripes 1a ... Group at the upper and lower ends of the diagonal stripes 1b ... Group inclined in the counterclockwise direction may be fixed to the outer surface of the tubular strips B, B. The rebar may be any of round steel, deformed bar, threaded bar, and the like. The tubular strip B may be formed by cutting a steel pipe into rings, or may be obtained by bending a strip-shaped steel plate into a tubular shape and fixing the edges by welding or the like.

FIG. 5 shows another embodiment of the present invention. This embodiment is characterized in that ring hoop muscles B'and B'are used in place of the tubular strips B and B. Other configurations and operations are the same as those of the previous embodiment, and therefore description thereof will be omitted. In the embodiment shown in FIG. 5, one ring hoop reinforcement B'is provided at each of the upper and lower ends of the multi-directional X-shaped assembly rebar, but as shown in FIG. Two may be provided each.

FIG. 7 shows another embodiment of the present invention. This embodiment is the fourth
Using 16 rebars pre-bent to the shape as shown in the figure, in other words, using 4 sets of unidirectional X-shaped bar A consisting of 4 sets of rebars, and A characteristic is that a multi-directional X-shaped assembled rebar is constructed such that two rebars intersect in an X shape in the same vertical plane.

In FIG. 7, 2, 4, 6, 8,
, 10, 12, 12, 14, 16 indicate the inclined lower end side of each diagonal line 1b ...
Reference numerals 2'to 16 'denote the upper end sides of the slanting lines 1b.
→ ', →', → ', →', → ',
→ ', →', → ', →' are rebars having diagonal bars 1b ...
2 ', 4 → 4', 6 → 6 ', 8 → 8', 10 → 10 ', 12 →
Reference numerals 12 ', 14 → 14', 16 → 16 'denote reinforcing bars having diagonal bars 1b ... Inclined counterclockwise in plan view. The → 'reinforcing bar and the 2 → 2'reinforcing bar intersect in an X shape in substantially the same vertical plane. In other words, the X-shaped arrangement is such that the X-shaped groove surface is vertical. It constitutes the muscle. →
The'reinforcing bar and the 4 → 4 'reinforcing bar also intersect in an X-shape. The pair of X-shaped reinforcing bars are arranged in positions symmetrical with respect to each other, and a set of four reinforcing bars (→ ′ and 2 → 2 ′,
A unidirectional X-shaped bar arrangement A composed of → 'and 4 → 4'). → 'reinforcing bar and 6 → 6'reinforcing bar, →' reinforcing bar and 8 → 8'reinforcing bar are crossed in the same manner as the X shape.
A pair of X-shaped reinforcing bars are arranged symmetrically with respect to each other, and four pairs of reinforcing bars (→ ′ and 6 → 6 ′, →
′ And 8 → 8 ′) constitutes a unidirectional X-shaped bar arrangement A. → 'reinforcing bar and 10 → 10'reinforcing bar, →' reinforcing bar and 12 → 12'reinforcing bar can also have similar X-shaped rebars, and
A pair of the X-shaped reinforcements are arranged point-symmetrically to form a unidirectional X-shaped reinforcement A composed of a set of four rebars (→ ′ and 10 → 10 ′, → ′ and 12 → 12 ′). ing. → 'reinforcing bar and 14 → 14'reinforcing bar, →' reinforcing bar and 16 → 16'reinforcing bar have the same X-shaped bar arrangement, and a pair of the X-shaped bar is arranged point-symmetrically. A set of four rebars (→ 'and 14
→ 14 ', →' and 16 → 16 ') form a unidirectional X-shaped bar arrangement A. Oblique stripes 1b inclined clockwise in a plan view ... Vertical stripes 1a at the upper and lower ends of the group ... The groups are tubular strips B, B
Or the outer surface (or inner surface) of the ring hoop muscles B ', B'
In addition, the diagonal muscles 1b inclined in the counterclockwise direction ... The vertical muscles 1a at the upper and lower ends of the group are formed on the inner surface (or outer surface) of the tubular strips B, B or the ring hoop muscles B ', B'. The fact that they are fixed by welding or adhesive is the same as in the previous embodiments.

Although not shown, in the multi-directional X-shaped assembled reinforcing bar shown in each of the above-described embodiments, a concrete restraint reinforcing bar (for example, a piano wire having a diameter of 1 to 3 mm or the like is used on the outer periphery of the multi-directional X-shaped assembled reinforcing bar. It is also possible to wrap (.) In a spiral or ring shape. By incorporating the multi-directional X-shaped assembly rebar having such a bar arrangement structure in the center of the pillar or pile, so-called confined concrete is formed in the center of the pillar or pile, and the concrete cracks. However, the compressive strength of concrete is not lost, and the toughness of columns and piles is significantly improved.

[Effect of device]

Since the present invention is configured as described above, the following effects can be obtained.

(1) One direction consisting of a pair of four rebars arranged in point symmetry with a pair of X-shaped rebars formed by intersecting two pre-bent rebars in an X-shape at the diagonal bar portion To configure the X-shaped bar and arrange a plurality of sets of the one-direction X-shaped bar around the center line to form a multi-directional X-shaped bar, so that the filling of concrete in the central part can be ensured, Even if you set a long distance between a pair of X-shaped rebars that are arranged point-symmetrically and form a circular void inscribed in the rebar group in the center of the rebar group, the X-shape will be uniform in all directions. The original mechanical characteristics of the bar arrangement method are exhibited.

(2) The reinforcing bars at the upper and lower end portions of the multi-directional X-shaped assembled rebar are connected to each other by the vertical bar groups at the upper and lower end portions of the diagonal bar group that is inclined clockwise in plan view and the diagonal bar that is counterclockwise inclined. The vertical muscle groups at the upper and lower ends of the muscle group are respectively arranged by separating the tubular strip plate or the ring hoop muscle from each other, and are fixed to both side surfaces of the tubular strip plate or the ring hoop muscle. Therefore, the diagonal stripes do not collide with each other at the X-shaped intersection and bend, and the troublesome work of inserting the reinforcing bar into the small hole formed in the annular steel plate is not required unlike the conventional example described at the beginning. become.

(3) Since the member connecting the reinforcing bars is a tubular strip or a ring hoop, the width in the direction perpendicular to the center line is narrow,
At the time of concrete pouring, the filling of concrete to the lower side of the tubular strip or the ring hoop bar is good, and there is no fear of concrete pouring failure.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a perspective view of a multi-directional X-shaped assembled rebar, FIG. 2 is a schematic plan view of the multi-directional X-shaped assembled rebar, and FIG. FIG. 4 is a side view of a main part, and FIG. 4 is a side view showing a reinforcing bar used in a multi-directional X-shaped assembly reinforcing bar. FIG. 5 is a perspective view of a multi-directional X-shaped assembly rebar showing another embodiment of the present invention. FIG. 6 is a vertical cross-sectional side view of an essential part showing another embodiment of the present invention. FIG. 7 is a partially cutaway schematic plan view of a multi-directional X-shaped assembly rebar showing another embodiment of the present invention. FIG. 8 is a perspective view showing a conventional example. 1a ... Vertical line, 1b ... Diagonal line, A ... Unidirectional X-shaped bar arrangement, B ... Cylindrical strip, B '... Ring hoop line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Wakabayashi Minoru Wakabayashi 14 518 Mandaim Kamogawa, Yoshida Kawaramachi, Sakyo-ku, Kyoto (72) Creator Takayuki Fukushima 5-12 Miyatsuka-cho, Ashiya-shi, Hyogo (56) References Special Kai 61-270446 (JP, A)

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An X-shaped bar composed of two reinforcing bars pre-bent so that the upper and lower ends are vertical bars and the middle part is a diagonal bar, and the diagonal bars cross each other in an X shape. pair,
A multi-directional X-shaped assembly rebar composed of unidirectional X-shaped rebars composed of four rebars arranged in point symmetry and arranging a plurality of the unidirectional X-shaped rebars around the center line. There is a vertical muscle group at the upper and lower ends of the diagonal muscle group inclined in the clockwise direction in a plan view and a vertical muscle group at the upper and lower ends of the diagonal muscle group inclined in the counterclockwise direction in each of the one-direction X-shaped bar arrangements. The muscle groups and the tubular band plate or the ring hoop muscle are arranged separately from each other,
A multi-directional X-shaped assembled rebar, which is fixed to both side surfaces of the tubular strip or the ring hoop bar.