JP2805669B2 - Precast reinforced concrete beam-column jointing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for joining precast reinforced concrete columns and beams.

[0002]

2. Description of the Related Art Conventionally, the reinforcement of a precast reinforced concrete beam-column joint is formed by passing through the main reinforcement at the upper end of the beam and bending the main reinforcement at the lower end of the beam in the panel zone.

[0003]

However, if the main bar at the lower end of the beam is bent up and arranged in the panel zone under high stress, the fixing force is insufficient, the beam bar comes off from the panel zone, and the hysteresis curve becomes a slip type. If the input shear stress level of the panel zone is high, it is difficult to precede the bending yield of the beam.

[0004] In some cases, it is difficult to arrange two-step reinforcing bars at the lower end of the beam. Further, when the main reinforcement at the lower end of the beam is fed to be bent up and fixed, the width of the beam may be increased due to the restrictions on the reinforcing bar and restrictions on the design. The present invention has been proposed in view of the problems of the prior art described above, and an object of the present invention is to provide a precast reinforced concrete beam-column joining device that is excellent in workability and is structurally reasonable. .

[0005]

In order to achieve the above object, a precast reinforced concrete column-to-beam joining apparatus according to the present invention is provided for a precast reinforced concrete column in which concrete is cast to below a beam and a column main bar is projected. The opposite precast reinforced concrete beams with steel plates welded to the ends of the main bars at the lower ends of the beams are bridged over the column capitals, and the end steel plates of each beam and the diaphragm-type steel plates arranged in the panel zone are welded. In addition, hoop reinforcing bars are arranged on the column reinforcing bars in the panel zone, and concrete is cast together with the slab in the panel zone.

[0006]

According to the present invention, as described above, the diaphragm-type steel plate set in the panel zone is welded to the steel plate attached to the end of the lower main bar of the precast reinforced concrete beam, thereby forming the precast reinforced concrete beam. And the column, the tensile force and the compressive force of the lower beam main reinforcing bar of the one beam are transmitted to the lower main bar of the other beam via the diaphragm type steel plate set in the panel zone.

In the prior art, since the ends of the main bars of the lower beam are bent up in the panel zone, the bars are converged. However, according to the present invention, the bars are simplified and the concrete can be cast. Workability is improved. Further, according to the present invention, the outer periphery of the precast reinforced concrete column is covered with the steel plate, and the mechanical properties of the panel zone and the column member are improved.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Reference numeral 1 denotes a precast reinforced concrete column in which concrete is cast to below the beam, and a column main bar 2 is protruded from the capital. Reference numeral 3 denotes a precast reinforced concrete beam to which a steel plate 5 is previously welded to the end of the main bar 4 at the lower end of the beam in a factory or the like.

After the precast reinforced concrete beam 3 with the ribs 6 arranged thereon is set on an L-shaped receiving bracket 7 or receiving concrete fixed to the column 1, the outer periphery of the column main bar 2 is covered. A diamond-shaped diaphragm-shaped steel plate 8 of about the size is inserted from above the panel zone to below the beam, a backing metal 9 is temporarily attached to the diaphragm-shaped steel plate 8, and the steel plate 5 at the end of the beam 3 and the diaphragm-shaped steel plate 8 And welded.

With respect to the precast reinforced concrete column 1, a precast reinforced concrete beam 3 in the X and Y directions is provided.
Are joined by the above-described method, the hoop bars 10 in the panel zone are arranged, concrete is poured into the panel zone together with the slab, and the columns and beams are integrated. In the drawing, reference numeral 11 denotes a main bar at the upper end of the beam.

[0011]

According to the present invention, since the present invention is constructed as described above, the beam reinforcement does not come out of the panel zone, a stable hysteresis can be secured, and the beam can be maintained even in the panel zone under high stress. Bending yield design can be facilitated. Further, since there is no bending of the main bar at the lower end of the beam in the panel zone, two-step reinforcement is possible, and the reinforcement in the panel zone is simplified.

Further, by covering the outer periphery of the main column with a diaphragm type steel plate, the mechanical properties of the panel zone and the column member are improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a precast reinforced concrete column-beam joining apparatus according to the present invention.

FIG. 2 is a plan view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast reinforced concrete column 2 Column main reinforcing bar 3 Precast reinforced concrete beam 4 Beam lower main bar 5 Steel plate 6 Rib 7 Receptacle 8 Diaphragm type steel plate 9 Backing metal 10 Panel zone hoop reinforcing bar 11 Beam upper main bar

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Matsubara 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Co., Ltd. (56) References JP-A-60-233248 (JP, A) (58) Investigated Field (Int.Cl. ⁶ , DB name) E04B 1/20 E04B 1/21

Claims (1)

(57) [Claims] 1. An opposing precast reinforced concrete beam in which a steel plate is welded to the end of the main bar at the lower end of the beam, and concrete is cast under the beam and the steel bar is welded to the end of the main bar at the lower end of the beam. Welding the end steel plate of each beam and the diaphragm-type steel plate arranged in the panel zone, arranging the hoop reinforcement on the column reinforcement in the panel zone, and putting concrete together with the slab in the panel zone. A precast reinforced concrete beam-column joining device characterized by being cast.