JPS6044459B2 - How to join precast reinforced concrete columns and beams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is disclosed in Japanese Patent Application No. 53-13444 (Japanese Unexamined Patent Publication No. 55-1989).
16163), the ends of a plurality of precast reinforced concrete beams are mounted on the capital of a precast reinforced concrete column, and the exposed part of the beam main reinforcement at the lower end of each beam is curved at a right angle to face above the column head. We proposed a method in which column-beam joint concrete is placed surrounding the curved portions of the main reinforcement at each lower end, surrounding closed-type reinforcement or spiral reinforcement.

However, when the diameter of the lower end beam main reinforcements increases and the number of them increases, the anchoring performance of the beam main reinforcements in the panel zone of the column head where a large number of reinforcing bars are intertwined deteriorates significantly.

The present invention has been proposed in order to eliminate such defects, and the present invention has been proposed in which the ends of a plurality of precast reinforced concrete beams are mounted on the capital of a precast reinforced concrete column, and the lower end of each high beam has an exposed end of the beam main reinforcement. is curved at a right angle to face above the column head, and a closed loop reinforcement made of reinforcing steel or wire rope is fitted between the curved parts of the lower end beam main reinforcement of each opposing wing, and at the same time, a closed loop reinforcement made of reinforcing bars or wire rope is fitted around the outer periphery of the entire lower end beam main reinforcement curved part. The present invention relates to a method for joining precast reinforced concrete columns and beams, which is characterized by surrounding a closed-type beam reinforcement anchorage and pouring concrete between the column head and each beam end.

In the present invention, as described above, in the upper panel zone of the column head of a precast reinforced concrete column, the exposed end of the main reinforcement of each lower end beam of a plurality of precast reinforced concrete beams whose ends are mounted on the same column head is bent upward at right angles. By enclosing the outer periphery of the curved part of each lower end beam main reinforcement with a closed type beam reinforcement anchor, it not only restrains the concrete in the panel zone, but also strengthens the curved part of each lower end beam main reinforcement of each opposing wing. Alternatively, by fitting closed loop reinforcements made of wire rope, the concrete near the curved part of the beam main reinforcement can be locally reinforced by the hoop effect. This can significantly improve anchoring properties.

The present invention will be described below with reference to the illustrated embodiments.

A is a precast reinforced concrete column, and the ends of precast reinforced concrete beams B on the front, rear, left and right sides are mounted on the column head. The exposed ends of the lower end main beam reinforcements 1 of each beam B are curved upward by 90 degrees at the column capital, and the curved portions 1a of the main beam reinforcements 1 of the beams B facing each other in the front and back and left and right directions are arranged so that they are close to each other and parallel to each other. In addition to the column-beam joint reinforcing bars 2, surrounding the reinforcing bars 3 for beam reinforcement anchors over the outer periphery of each curved portion, the curves 1a of the lower end beam main bars 1, 1 of each pair of opposing 1a
Closed loop reinforcing bars 4 made of reinforcing bars or wire lobes are fitted in between, and concrete C is cast between the column head of column A and the end face of each of the beams B to anchor each of the lower end beam main reinforcing bars 1. Pillar A. , beam B are joined together.

In addition, the reinforcing bars 5 of each beam B protrude from the upper end of the beam, and the reinforcing bars 5
The beam upper end reinforcement 6 is passed through between the protruding parts of the beam B, and at the same time as the column-beam joint concrete C is placed, the joint concrete C'' of the deck slab D is placed on the top of the beam B. It's summery.

In the figure, 7 is the main column reinforcement, and 8 is the joint of the main column reinforcement 7. Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a joint of a precast reinforced concrete column and beam constructed by the method of the present invention, FIG. 2 is a cross-sectional plan view thereof, and FIG. 3 is a longitudinal cross-sectional view of a beam portion. A... Precast reinforced concrete column, B...
...Precast reinforced concrete beam, C...
... Concrete, 1 ... Lower end beam main reinforcement, 1a
...Curved part, 3...Reinforcement strap for beam reinforcement, 4...Loop reinforcement.

Claims (1)

[Claims] 1. The ends of a plurality of precast reinforced concrete beams are mounted on the capitals of precast reinforced concrete columns, and the exposed ends of the lower beam main reinforcements of each of the beams are curved at right angles to face above the column heads. A closed-type loop reinforcement made of reinforcing bars or wire rope is fitted between the curved parts of the main bar at the lower end of the beam, and closed-type reinforcing bars for anchoring the beam are surrounded around the entire outer periphery of the curved part of the main bar at the lower end of the beam. A method for joining precast reinforced concrete columns and beams, characterized by pouring concrete between the ends of each beam.