JPH0735669B2 - Joining method of reinforced concrete columns and precast reinforced concrete beams - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for joining a reinforced concrete column and a precast reinforced concrete beam.

[Prior Art] Conventionally, as a method for joining precast reinforced concrete columns and beams, those described in JP-A-55-61632 and JP-B-62-32299 are known.

[Problems to be Solved by the Invention] The conventional joining method described above uses The exposed end portion of the main reinforcement of the lower beam is curved, and the curved portion is surrounded by a reinforcing strip (Japanese Patent Laid-Open No. 55-61).
No. 632), or the curved portions facing each other are fitted by loops for each set, and the entire curved portion is further surrounded by reinforcing strips (Japanese Patent Publication No. 62-32299).

However, according to the above method, since all the exposed ends of the lower beam main bar are curved, a large number of reinforcing bars are complicated in the curved part when the curved part is surrounded by the reinforcing strips. However, there is a drawback in that the anchoring performance of the main beam of the beam is deteriorated, and consequently the strength of the beam joint is deteriorated.

Further, if the diameter of the main beam of the beam becomes large or the number of main beams becomes large, the fixing performance further deteriorates.

[Object of the Invention] Therefore, an object of the present invention is to provide a method for joining precast reinforced concrete column beams capable of obtaining high anchorage performance of the main beam reinforcement at the column heads which are beam joints.

[Means for Solving the Problems] The inventors of the present invention have reached the present invention as a result of extensive studies to achieve the above object.

That is, the joining method of the reinforced concrete column and the precast reinforced concrete beam according to the present invention is a method of joining the precast reinforced concrete column or the cast-in-place concrete column and the precast reinforced concrete beam, and at the end of the first precast reinforced concrete beam to be joined. The beam main bar is exposed, and the end of the beam main bar is bent in a substantially vertical direction, and the beam main bar is exposed at the end of the second precast reinforced concrete beam to be joined, and , The end of the beam main bar is formed in a loop shape that bends in the horizontal direction, and the exposed end of the main bar of the first beam is placed on the beam-column joint where the column reinforcing bar is in an exposed state, Next, the exposed ends of the main bars of the second beam are placed with the ends of the main bars facing each other with the loops being horizontal. Engage the main bars of the first beam in a state in which they are located within the loops of the main bars of the second beam, and further surround the main bar bending portion of the first beam in the horizontal direction with a reinforcing band, It is characterized in that concrete is placed in the above-mentioned beam-column joint.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a joint portion of a precast reinforced concrete column beam constructed by the method of the present invention. FIG. 1 is a transverse sectional view and FIG. 2 is a longitudinal sectional view.

In the figure, 1 is a precast reinforced concrete or cast-in-place reinforced concrete column, and precast reinforced concrete beams 2 and 3 are mounted on the head of the column.

When mounting the beams 2 and 3, first, the beams 2 and 2 having the curved portion 4A on the exposed end of the lower beam main bar 4 are mounted.

Next, the beams 3 and 3 each having the loop portion 5A engageable with the curved portion 4A are mounted on the exposed end portion of the main beam 5 of the lower end beam, and the curved portion 4A and the loop portion 5A are engaged as illustrated. . The loop portion 5A may be formed so as to be engageable with the curved portion 4A and have sufficient strength at the time of engagement. It is preferable in terms of strength of the part.

After the engagement, the curved portions 4A, 4A are surrounded by the reinforcing strips 6. The surroundings of the reinforcing strips 6 are, as shown in FIG.
Although it may be spirally surrounded by the outer periphery of 4A, it may be surrounded by fitting a closed loop muscle or the like.

Then, concrete 7 is placed on the head of the pillar. In the figure, 8 is a column main reinforcement and 9 is a column reinforcement band of the column main reinforcement 8.

When the beams 2, 2 and the beams 3, 3 whose upper surfaces are lacking by the slab thickness are used, as shown in JP-A-55-61632 and JP-B-62-32299, Before placing concrete, the upper beam main bars are laid between the beams respectively, and then concrete is placed on the beam top surface and column head,
The beam and the slab are integrally joined.

Although one embodiment of the present invention has been described above, in the present embodiment, the case where four beams are mounted in a cross shape on the head of the pillar 1 (joined to the pillar 1) has been described. The present invention is not limited to this, and can be applied even when the number of beams to be mounted and the mounting position are different from those in this embodiment.

Further, in the present embodiment, the lower beam main bar is used as the beam main bar having the curved portion and the loop portion, but the present invention is not limited to this, and other beam main bars (for example, upper beam main bar) may be used.

[Effects of the Invention] According to the present invention, since the number of reinforcing bars in the curved portion is smaller than that of the conventional one (half in the above-mentioned embodiment), the diameter of the beam main bar becomes thicker, and the concrete is easy even if the number increases. The fixing performance is high. Therefore, there is an effect that the strength of the beam joint is high.

Further, when the beam is mounted on the pillar head, the beam main bar having the loop part and the beam main bar having the curved part are engaged with each other, and therefore, the bonding strength between the beam and the beam is increased to some extent before surrounding the curved part. Therefore, it is possible to obtain the stability of the beam at the column head, and further, the strength after enclosing the curved portion is extremely high.

According to the method for joining a reinforced concrete column and a precast reinforced concrete beam according to the present invention, the main bar is exposed at the end of the first beam to be joined and curved upward, and the main bar is exposed at the end of the second beam. A horizontal loop is formed in the horizontal direction. When joining, make sure that the loops do not overlap each other but face each other, and position the main bar of the first beam in this loop, and arrange the band in the horizontal direction. Since it is configured, compared with the configuration in which the loops are stacked vertically, it is possible to arrange the stirrups as they are without dividing the stirrups, and there is no need for delicate adjustment of the overlap of the loops. There is an advantage that the construction efficiency can be remarkably improved.

[Brief description of drawings]

1 and 2 show a joint portion of a precast reinforced concrete column beam constructed by the method of the present invention. FIG. 1 is a transverse sectional view and FIG. 2 is a longitudinal sectional view. 1: Pillars 2, 3: Beams 4: Bottom beam main bar 4A: Curved part 5: Bottom beam main bar 5A: Loop part 6: Reinforcing band reinforcement 7: Concrete 8: Column main bar 9: Column reinforcing bar bar

Claims (1)

[Claims] 1. A method for joining a precast reinforced concrete column or a cast-in-place reinforced concrete column and a precast reinforced concrete beam, wherein a beam main bar is exposed at an end of the first precast reinforced concrete beam to be joined, The end of the main bar is curved in a substantially vertical direction, and the main bar of the beam is exposed at the end of the second precast reinforced concrete beam to be joined, and
The end portion of the main beam of the beam is formed in a loop shape that bends in the horizontal direction, and the exposed end portion of the main bar of the first beam is placed on the beam-column joint where the column reinforcing bar is in an exposed state. The exposed ends of the main bars of the second beam are placed with the ends of the main bars facing each other in a state where the loops are horizontal, and the main bars of the first beam are of the second beam. Engage both in the state of being located in the loop of the main bar, and further, enclosing the curved part of the main bar of the first beam in the horizontal direction with a reinforcing strip, and placing concrete in the above-mentioned beam-column joint. A method for joining reinforced concrete columns and precast reinforced concrete beams, which is characterized in that