JPH0649897A - Joining method for beam and pillar and precast concrete pillar applied to above method - Google Patents

Abstract

PURPOSE:In the case of mutually joining a steel frame beam and a reinforced concrete pillar, to secure their joining accuracy, and to easily join them to improve executing ability. CONSTITUTION:After a pillar 1 is built up by inserting a pillar main reinforcement 7 into a main reinforcement inserting hole 2 and a joining box 3 into a recessed groove 6, a beam 8 is built over between the pillars 1. The steel frames 8b of the joined ends 8d of the beams 8 mounted opposite to each other on the head parts of the pillars 1 are joined to the joining box 3, and the pillar main reinforcement 7 is inserted into the main reinforcement inserting hole 2 at the pillar head part, and concrete 10 is placed in the pillar head part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining a beam and a column and a precast concrete column used for the method.

[0002]

2. Description of the Related Art Generally, when joining a steel beam and a reinforced concrete column, after constructing the reinforced concrete column by the in-situ construction method, the joining end of the steel beam is placed on the column head and the joining end is It was joined to the steel frame for mounting inside the column, and concrete was placed at this joint to join them.

[0003]

However, in the method of joining a steel beam to a cast-in-place concrete column as described above, it is difficult to secure the joining accuracy of the steel beam. In addition, when the steel frame of the steel beam and the steel frame for mounting in the column are joined inside the joint, it is difficult to install because the main bar of the column interferes. There was a problem that the construction process was increased because frame work was required.
The present invention has been made in view of the above problems, the object is to join the reinforced concrete column and the steel frame concrete beam, it is possible to ensure the joining accuracy, and can be easily joined. (EN) A method for joining a beam and a column that can improve workability, and a precast concrete column used for the method.

[0004]

The gist of the method for joining a beam and a column of the present invention to achieve the above-mentioned object is to insert a column main bar of a lower floor into a main bar insertion hole penetrating into the column to make a precast concrete. Build a column, join the joint end of the precast concrete beam placed on the column head, join the box for joining protruding to the column head, and insert the column main bar from the column head to the main bar insertion hole, It consists in placing concrete on the column head and joining it, the precast concrete column used for the joining method has a main bar insertion hole penetrating along the reinforcement bar in the column, and a box for joining to the column head I'm in the project.

[0005]

In such a joining method, when joining a precast concrete beam to a precast concrete column, it is possible to improve the workability because the precast concrete beam can be joined without the column main bar. Moreover, since the joining end of the precast concrete beam is joined to the joining box protruding from the column head, the joining accuracy can be secured. Furthermore, since the main column reinforcement can be connected by inserting the main column reinforcement from the stigma into the main insertion hole, the construction is simple.

[0006]

EXAMPLE An example of the method of joining a beam and a column and the precast concrete column used therefor according to the present invention will be described in detail below. 1 is a sectional view of a precast concrete column, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG.

The pillar 1 of the present invention is a precast concrete pillar, and the reinforcing bar 1b is placed in the precast concrete 1a.
And the stirrup 1c are reinforced, and the reinforcement 1b is reinforced up to the upper end surface of the precast concrete 1a. Then, main bar insertion holes 2 penetrating up and down along the reinforcement bars 1b are penetrated at four corners in the pillar 1, and a box 3 for joining is provided on the pillar head in a protruding manner. The main reinforcement insertion hole 2 is formed by embedding three sheath tubes 4 inside the additional reinforcement 1b at the corner of the column 1.

The joining box 3 is provided with stud bolts 3b at the lower portion of the box 3a and joining plates 3c at the upper portion of the box 3a so as to project in four directions.
The projecting lower part is embedded in the pillar head, and the projecting length of the projecting part is such that the upper end thereof appropriately projects from the upper surface of the floor slab 5 by a height. Further, a concave groove 6 into which the upper end of the joining box 3 is inserted is formed at the lower end of the column 1.

Such a pillar 1 is prefabricated in a factory, transported to a site and assembled to join beams.
The joining method will be described with reference to FIGS. In FIG. 4, the concrete of the lower floor is cast, and the pillar main bars 7 of the pillar 1 and the upper ends of the joining boxes 3 project from the upper surface of the floor slab 5. Then, as shown in FIG. 5, the column main bar 7 is inserted into the main bar insertion hole 2 and the joining box 3 is inserted into the groove 6, and the column 1 is inserted.
When the column is installed, the pillar 1 becomes independent by the joining box 3.
A plurality of pillars 1 are to be built in appropriate places by such a method.

Next, as shown in FIG. 6, a beam 8 is laid across these columns 1, and a steel frame 8b of a joint end 8a placed opposite to the column head is joined to the box 3 for joining. The plate 3c is bolted, and the upper and lower ends of the steel frame 8b are welded to the box 3a. This beam 8 is a precast concrete beam, and a steel frame 8b is embedded in the precast concrete 8d, and the upper part of the stirrup 8c wound around the steel frame 8b is projected from the upper surface of the precast concrete 8d. Further, this joining work can be easily performed because the column main bars 7 are not projected from the column head.

After these beams 8 are joined to the pillar 1 by the joining box 3, as shown in FIG. 7, the pillar main bar 7 is inserted into the main bar insertion hole 2 from the pillar head and the main bar insertion hole 2 is inserted. By filling the grout through the injection hole 2a,
The column main bars 7 on the lower floor and the column main bars 7 on the upper floor are joined in the column 1.

Next, as shown in FIG. 8, a precast concrete floor slab 9 is erected between the beams 8 and concrete 10 is placed on the precast concrete floor slab 9 and at the joints of the pillar heads to construct the floor slab 5 and the pillars. 1 and the beam 8 are joined. In this state, the column main bars 7 and the upper ends of the joining boxes 3 project from the floor slab 5 for joining columns on the next floor. Then, by repeating such work in sequence, the pillar 1 and the beam 8 can be easily
And can be joined to construct a precast concrete structure.

[0013]

Since the joint end of the beam is joined to the connecting box of the column head, the joint accuracy can be improved.

When the joining end portion of the beam is joined to the precast concrete column, since there is no column main bar, the joining work can be easily performed.

The main reinforcement inserted into the main reinforcement insertion hole and the joining box allow the precast concrete column to be self-supporting when it is erected.

Since the joint of the main reinforcement of the column is a joint of reinforcing bars embedded in a precast concrete column, the construction can be easily carried out.

By projecting the connecting box on the column head of the column, it is possible to improve the transmission performance of the stress of the beam to the column.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a column.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a cross-sectional view of a floor slab on a lower floor in which a pillar main bar and a connection box are projected.

FIG. 5 is a cross-sectional view of a pillar installed at a pillar-installed position on a lower floor.

FIG. 6 is a cross-sectional view in which a beam is installed on a column.

FIG. 7 is a cross-sectional view of a column and a beam in which a column main reinforcement is inserted into a main reinforcement insertion hole.

FIG. 8 is a sectional view of a floor slab constructed on a beam.

[Explanation of symbols]

 1 Column 2 Main Reinforcement Insertion Hole 3 Joining Box 5 Floor Slab 6 Recessed Groove 7 Column Main Reinforcement 8 Beam

Claims (2)

[Claims] 1. A precast concrete column is constructed by inserting a column main reinforcement of a lower floor into a main reinforcement insertion hole penetrating into the column, and a joint end portion of a precast concrete beam placed on the column head is projected to the column head. A method for joining a beam and a column, which comprises joining to the provided joining box, inserting a column main bar from a column head into the main bar insertion hole, and placing concrete into the column head to join the columns. 2. A precast concrete column characterized in that a main bar insertion hole is penetrated into the column along the reinforcement bar, and a box for joining is projected on the column head.