JPH0711202Y2 - Joint structure of columns and beams in precast reinforced concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a joint structure of columns and beams in a precast reinforced concrete structure.

[Prior art]

Conventionally, as a method of connecting columns and beams in a precast reinforced concrete structure, as shown in FIG. 4 and FIG.
The end of the beam 2 made of precast reinforced concrete is placed on the edge of the upper end surface of the column 1 made of precast reinforced concrete, and the main bar 3 projecting at the upper end of the column 1 is positioned in the joint space 4 and the end of the beam 2 is placed. After arranging the main bar 5 protruding in the inside of the joint space 4 on the pillar 1 and arranging the stirrups 6, concrete is cast in-situ in the joint space 4 to cure and cure the concrete. It is common to connect columns and beams.

[Problems to be solved by the device]

According to the above-mentioned conventional joining method, since a relatively large amount of cast-in-place concrete that influences the strength is required in the joining space portion 4, a relatively strong concrete formwork is required and the hardening time of the concrete is required, which leads to a construction period. Has the problem of becoming longer. Further, since the column main bars and the beam main bars intersect in the joint space 4, it is necessary to consider the arrangement of the column main bars and the beam main bars. For example, as shown in FIG. 4, four beams are joined on the pillar. In this case, the positions of the beams must be shifted from each other so that the beam main bars of the beams facing each other do not interfere with each other, and it is necessary to prepare various types of beams.

An object of the present invention is to solve the above problems by making it possible to join columns and beams made of precast reinforced concrete by welding.

[Means for Solving the Problems]

In order to solve the above problems, the present invention is as follows.
The pillar (7) made of precast reinforced concrete is integrally molded up to the joint with the beam, and the steel plate (8) for joining is fixed to the side of the joint with the beam, the surface of which is exposed to the outer surface of the pillar, and fixed. In addition, a steel plate (13) for connection is fixed to the end of the beam (12) made of precast reinforced concrete, which is connected to the column (7), with its end face exposed at the connection end face of the beam (12). The two steel plates (8) and (13) are joined to each other and the joints are joined by welding (w). A second invention is to connect the beam (12) to the beam (12) on the side of the pillar (7) which is connected to the beam (12).
Is formed with a hook step (7a) for supporting the lower surface of the tip of the.

〔Example〕

Next, a first embodiment of the present invention shown in FIGS. 1 and 2 will be described.

A column 7 made of precast reinforced concrete has a steel plate 8 exposed vertically along the upper side surface to which the beam is connected and fixed vertically. A fixing streak 9 embedded in the pillar 7 is welded and fixed to the back surface of the steel plate 8, and the steel plate 8 is firmly fixed to the pillar 7. 10 is the main pillar muscle, and 11 is the stirrups. Reference numeral 12 is a precast reinforced concrete beam, and a steel plate 13 is provided at the end connected to the column so as to be perpendicular to the steel plate 8 and one end thereof is exposed. The embedded portion of the steel plate 13 is welded and fixed to the main beam 14 of the beam, and the steel plate 13 is firmly fixed to the beam 12.

In order to join the pillar 7 and the beam 12 in the field, the beam 12 is installed between the pillars 7 standing upright at a predetermined position by abutting the steel plate 13 thereof orthogonally to the steel plate 8 on the pillar 7 side, Both steel plates 8 and 13 are joined by welding w. This welding operation is performed through the gap D between the column 7 and the beam 12. Further, since the steel plate 13 on the beam 12 side is vertically arranged and welded to the steel plate 8 on both sides of the vertical end portion thereof, the transmission force of the vertical load acting on the beam 12 to the column 7 is strengthened. After welding, fill the crevice D with mortar to prevent fire,
Take anti-corrosion treatment.

FIG. 3 shows a second embodiment of the present invention, in which a hooking step portion 7a for supporting the lower surface of the tip end portion of the beam 12 to be joined is formed on the side surface of the pillar 7 where the beam 12 is joined. It is a thing. That is, a square steel pipe 8a having a diameter slightly smaller than the diameter of the main pillar portion is exposed at the beam connecting portion of the pillar 7. The square steel pipe 8a is welded and fixed to the column main bar 10. 9 is a fixed line. According to the present embodiment, when the steel plates 8 and 13 fixed to the pillar 7 and the beam 12 are joined by welding w, the ends of both joints of the beam 12 are connected to the stepped portions 7a of the pillars 7 and 7. Hang it on 7a and place it on the beam 12
Can be temporarily installed.

Although the steel plate 13 for welding the beam 12 is arranged vertically in the above-mentioned embodiment, the steel plate 13 is located above and below the beam 12.
You may arrange | position horizontally. Of course, the horizontal steel plate 13 is welded to the main beam 14 of the beam.

[Effect of device]

Since the present invention has the structure as described above, the strength connection between the column and the beam is performed by welding steel plates, and the mortar or concrete is used for the purpose of filling the space for welding work from the viewpoint of fire protection and rust prevention. You don't have to expect strength. Therefore, it is possible to construct columns and beams of precast reinforced concrete prior to other work as in the case of constructing steel frames, and then collectively fill the welding work space with mortar or concrete. Therefore, the work period can be significantly shortened as compared with the conventional work of waiting for the hardening of a large amount of concrete, and the present invention is suitable for a precast reinforced concrete structure for the purpose of shortening the work period.
In addition, since the amount of mortar or concrete used for connecting columns and beams is extremely small, the formwork may be extremely light, and the work and cost required to install the formwork are the same as those of the conventional ones. Can be reduced compared to. In addition, even when a plurality of beams on the same floor are connected to one pillar, the main bars of the beams do not cross each other, so that,
There is no need to prepare multiple types of beams that are offset so that the main bars do not interfere with each other.

According to the second invention, in addition to the above effects, when welding both the steel plates of the beam and the pillar, the joint end of the beam is placed on the hook step formed on the pillar to temporarily erect the beam. Therefore, the supporting work for temporarily holding the beam is not necessary, and the beam can be accurately positioned with respect to the column.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a first embodiment of the present invention, and FIG. 2 is a sectional side view of the same. FIG. 3 is a side sectional view showing a second embodiment of the present invention. FIG. 4 is a plan view showing a conventional structure, and FIG.
The figure is the same side view. 7 …… Column, 8,13 …… Steel plate, 12 …… Beam, w …… Welding

Claims (2)

[Scope of utility model registration request] 1. A column (7) made of precast reinforced concrete is integrally molded up to the joint with a beam, and a steel plate (8) for coupling is formed on the side of the beam, and the surface of the column is exposed on the outer surface of the column. The steel plate (13) for joining is exposed at the joining end face of the beam (12) at the joining end portion of the beam (12) made of precast reinforced concrete with the pillar (7). And fixed to both steel plates (8),
A joint structure of columns and beams in a precast reinforced concrete structure, characterized in that (13) are joined to each other and the joints are joined by welding (w). 2. A hook step (7a) for supporting the lower surface of the tip of the beam (12) to be connected is formed on the side surface of the column (7) connected to the beam (12). Joint structure of columns and beams in the described precast reinforced concrete structure.