JP2581302Y2 - Reinforcement hardware for RC or SRC beam openings - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing metal for openings of RC (reinforced concrete) beams or SRC (steel reinforced concrete) beams.

[0002]

2. Description of the Related Art Conventionally, as a reinforcing metal for an opening of an RC beam or an SRC beam, as shown in FIG. 5, a plurality of ring streaks R are arranged in an inner and outer multiplex, and a plurality of branches are attached to these ring streaks. The bars E are arranged radially and integrally joined, and the reinforcing metal for the opening is attached around the circular opening b of the beam B.

According to the strength test conducted by the present inventors, the above-described conventional reinforcing metal for an opening is in contact with an opening b of a beam B and extends vertically with respect to a longitudinal axis 3b of the beam. Lines C1 and C at an angle of about 45 ° and about 60 °
In the fracture region C surrounded by 2, it was found that the shear cracks easily spread. This is because the ring streaks R restrain the normal fracture line, that is, cracks in the 45 ° direction passing through the center of the opening b, and increase the strength of the opening b. This is because cracks are concentrated in the destruction region C which is reduced. In the destruction area C,
The ring streaks R are no longer perpendicular to the crack direction, making it difficult to exhibit sufficient crack resistance,
In addition, the conventional branch streak E is difficult to directly act on the crack.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to further enhance the reinforcing ability of the above-mentioned conventional reinforcing metal for an opening, and to devise the arrangement of the conventional branch E to the ring R. As a result, the branch streaks effectively act on cracks that are likely to occur in the fracture area C, and as a result, RC beams or SRCs capable of improving the strength of the beam.
An object of the present invention is to provide a reinforcing metal fitting for an opening of a beam.

[0005]

The RC beam or S of the present invention is provided.
The reinforcing metal for an opening of an RC beam is composed of a plurality of ring bars arranged in multiple layers inside and outside, and a plurality of branch bars integrally joined from an inner ring bar to an outer ring bar. In the reinforcing metal for the opening of the beam or SRC beam,
The branch streaks extend from each of about four equal points on the circumference of the inner ring streak to form two sets of crosses that approach each other toward the outer ring streak; Moreover, the two sets of U-shaped branch streaks are arranged so as to be substantially point-symmetric with respect to the center of the inner ring streaks.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a ring bar, which is formed by bending a reinforcing bar such as a hard steel wire into a ring shape and butt-welding both ends 1a thereof. In this embodiment, three ring streaks 1 having different diameters are arranged concentrically at appropriate intervals sequentially from the inside.

It is preferable that the diameter, the interval between the three ring bars 1 and the diameter of the reinforcing bars, and the like of the three ring bars 1 are appropriately determined according to the size of the beam to be laid, the diameter of the opening thereof, and the like. Further, the combination of the ring streaks 1 is not limited to three as in the present embodiment, but may be any combination as long as it is multiplexed, such as double, quadruple, or quintuple. Note that the ring streaks 1 arranged in a multiplex manner may be arranged slightly eccentric to each other.

Reference numeral 2 denotes a branch streak, which is disposed so as to obliquely cross each ring streak 1 from the inner ring streak 1 to the outer ring streak 1, and integrally formed by welding or the like at the intersection. They are joined to form an opening reinforcing metal as a whole.

The four branch streaks 2 are arranged, and their inner ends 2 a are joined to the respective positions of approximately four equal points on the circumference of the inner ring streak 1. When two adjacent branch muscles 2 of the four branch muscles 2 are paired and divided into two pairs, the two branch muscles 2 of each pair approach each other toward the outer ring muscle 1. They are arranged so as to form a square shape. Furthermore, these two sets of C-shaped branch muscles 2 are arranged so as to be point-symmetric with respect to the center of the inner ring muscle 1.

Since the reinforcing metal for an opening in the above embodiment is constructed as described above, it is necessary to arrange the reinforcing metal around the opening of the beam as shown in FIGS. Around the sleeve 4 of the opening 3a, at least the inner ring streaks 1 are arranged concentrically. At this time, two sets of C-shaped branch bars 2 arranged to be point-symmetric with respect to the center of the inner ring bar 1 are line-symmetric with respect to the longitudinal axis 3b of the beam 3. Set as shown.

Therefore, as is apparent from FIG.
The streak 2 has an angle of about 45 with respect to the longitudinal axis 3 b of the beam 3.
Since the reinforcement is arranged in a direction substantially transverse to the narrow-width fracture region C (dashed-line hatched portion) between the two fracture lines C1 and C2 in the directions of ゜ and 60 °, the shearing of the opening 3a is performed. Cracks can be effectively prevented.

FIG. 4 shows another embodiment, in which two V-shaped reinforcing bars 5 and two arc-shaped bars 6 are joined to each other to be substantially the same as the inner ring bar 1 in the above embodiment. And the straight portion 5a of the V-shaped reinforcement 5 constitutes the same structure as the branch 2 of the above embodiment. Accordingly, the ring-shaped portion formed by joining the two V-shaped reinforcing bars 5 and the two arc-shaped bars 6 to each other is included in the concept of the inner ring bar in the present invention, and is also included in the above-described V-shape. The straight portion 5a of the reinforcing bar 5 is included in the concept of the branch bar in the present invention.

[0013]

Advantages of the Invention 1) The reinforcing metal for an opening of the present invention includes a plurality of ring streaks arranged in multiple inside and outside, and a plurality of branch streaks integrally joined from the inner ring streaks to the outer ring streaks. , The reinforcing metal for an opening of an RC beam or an SRC beam, wherein the branch streaks extend from each of approximately four equal points on the circumference of the inner ring streaks to the outer ring streaks. Are arranged so as to form two sets of C-shape approaching each other, and the two sets of C-shaped branch streaks are substantially point-symmetric with respect to the center of the inner ring streaks. Since the two sets of C-shaped branch lines are set so as to be symmetrical with respect to the longitudinal axis of the beam, a fracture region extending in contact with the opening is formed. Effectively prevents shear cracks, which are likely to occur in the opening, and improves the breaking strength of the opening It can be occupied. 2) The structure is simple and can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a reinforcing metal for an opening of the present invention.

FIG. 2 is an explanatory view showing a state where the reinforcing metal for an opening of FIG. 1 is set around an opening of a beam;

FIG. 3 is a sectional view taken along the line II in FIG. 3;

FIG. 4 is a front view of a reinforcing metal for an opening showing another embodiment.

FIG. 5 is an explanatory view of a conventional reinforcing metal for an opening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring streak 1a Both ends 2 Branch streak 2a Inner end 3 Beam 3a Opening 3b Longitudinal axis 4 Sleeve 5 V-shaped reinforcement 5a Straight line 6 Arc streak C Breaking area C1, C2 Breaking line L 45 ° tangent

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) E04C 5/00-5/20 E04C 3/20

Claims (1)

(57) [Scope of request for utility model registration] An RC beam or SRC comprising a plurality of ring streaks arranged in an inner and outer multiplex and a plurality of branch stirs integrally joined from an inner ring streak to an outer ring streak.
In the reinforcing hardware for an opening of a beam, two sets of the branch streaks approaching each other from the positions of about four equal points on the circumference of the inner ring streaks toward the outer ring streaks. It is configured to extend so as to form a C-shape, and to be arranged so that these two sets of C-shaped branch streaks are substantially point-symmetric with respect to the center of the inner ring streaks. RC to do
Reinforcing hardware for openings in trusses or SRC trusses.