JPH05272171A - Column-beam mixed structure - Google Patents

Abstract

PURPOSE:To improve the earthquake-proof ness and economic efficiency of a building. CONSTITUTION:A column 10 is formed as a reinforced concrete structure using a PC column framework 12. A general part 12a of a beam 14 is formed as a RC structure using a bent framework 16 having a U-shaped section. A connection unit 22 between the column 10 and the beam 14 is formed in an S-structure, a steel pipe 24 is disposed in the central area, and I-shaped steels 26 are welded and fixed to the outside of the steel pipe 24 radially toward the connecting direction of the beam 14. The lower side and both sides of the I-shaped steel 26 are covered with the bent framework 16. A reinforcing bar 20 is disposed in the interior of the bent framework 16 and concrete is placed therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed structure in which columns and beams are made of reinforced concrete and steel frames.

[0002]

2. Description of the Related Art In recent years, a construction method using columns or beams of a reinforced concrete structure has been widely used. In this case, in order to improve the workability of the reinforced concrete structure,
Many mixed structures have been proposed. In this case, the steel frame structure is often used for a main part of a member such as a pillar or a beam, that is, for a general part, for example, JP-A-61-2331.
47 (E04C 3/293), JP-A-3-2
Japanese Patent No. 75839 (E04B 1/30) discloses a structure in which a pillar is configured as a reinforced concrete (RC) structure and a general portion of a beam is configured as a steel frame structure.

In this case, the column / beam structure shown above is
A connection unit made of steel frame is used for the connection portion between the pillar and the beam, and the steel beam is connected to this connection unit. Further, in the pillar / beam structure shown above, the end of the steel beam is embedded in the reinforced concrete portion integrally projected from the pillar so as to be integrated.

[0004]

However, in such a conventional column-beam mixed structure, a steel frame is used for the main general part of the beam. Therefore, the original features of the reinforced concrete structure, that is, the seismic resistance and the economical efficiency cannot be sufficiently exhibited. In other words, the use of a large amount of steel frame material has the problems that the earthquake resistance of the building is poor and the construction cost is significantly increased.

In view of the conventional problems, the present invention has a column-beam mixed structure capable of simultaneously maintaining the seismic resistance and economical advantages of a reinforced concrete structure while at the same time ensuring the toughness advantages of a steel frame structure. The purpose is to provide.

[0006]

In order to achieve the above object, the present invention provides a reinforced concrete structure in which a general portion of a column has a reinforced concrete structure and a general portion of a beam uses a precast concrete formwork having a U-shaped cross section. age,
In addition, the joint portion of these columns and beams is made of a steel frame structure.

Further, the precast concrete formwork is also used as a skeleton form.

[0008]

With the above structure, in the mixed structure of pillars and beams of the present invention, the general part of the pillar is a reinforced concrete structure, and the general part of the beam is a precast concrete formwork having a U-shaped cross section, or By using a reinforced concrete structure that uses the frame / formwork to be constructed, it is possible to improve the earthquake resistance of the building and reduce the construction cost. In addition, even when the general parts of the columns and beams have a reinforced concrete structure in this way, since the joint parts of the columns and beams have a steel frame structure, the toughness of these joint parts is secured and sufficient reinforced concrete construction is achieved. Seismic performance can be secured.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 show an embodiment of a mixed structure of columns and beams according to the present invention, FIG. 1 is a side sectional view of a main part, and FIG.
1 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a sectional view taken along the line BB in FIG.

That is, in the mixed column / beam structure of this embodiment, the column 10 is a hollow cylindrical PC column form 12 as shown in FIG.
Reinforced concrete using (hereinafter abbreviated as RC)
In addition to being constructed as a structure, the general portion 12a occupying the central portion of the beam 14 is constructed as an RC structure using a precast concrete bending frame 16 having a U-shaped cross section.

As shown in FIG. 2, the RC pillar 10 has a PC pillar formwork 12 having a rectangular cross section which is vertically installed at a position where the pillar 10 is to be constructed. Concrete is poured with the reinforcing bars 18 arranged inside.
On the other hand, in the RC beam 14, as shown in FIG. 3, the bending form 16 is horizontally installed at a position where the beam 14 is to be constructed, and then the reinforcing bar 20 is placed in the bending form 16. It is placed and concrete is poured.

The PC pillar formwork 12 is set to a predetermined height, and a joint portion of the RC beam 14 is provided between the PC pillar formwork 12 arranged in a lower layer and the PC pillar formwork 12 arranged in an upper layer. The connection unit 22 is disposed.

The connecting unit 22 is constructed as a steel frame structure, and a square tube-shaped steel pipe 24 is arranged in the central portion thereof, and the steel pipe 24 is provided with an I-radial shape radially outward in the connecting direction of the beam 14.
The shaped steel 26 is welded and fixed. The I-shaped steel 26 only needs to have a length L required to connect the beam 14, and this length L is set sufficiently short with respect to the entire length of the beam 14.

The outer diameter of both ends of the steel pipe 24 is formed to be substantially the same as the outer diameter of the PC column formwork 12. And the RC
When the pillar 10 is constructed, both ends of the steel pipe 24 are fitted inside the frame 28 fixed to the ends of the upper and lower PC pillar forms 12, and in this state, inside the PC pillar form 12. Concrete is poured. Therefore, the connection unit 22 is integrated with the pillar 10 by the cast concrete. still,
A plurality of stud bolts 30 are provided on the inner side of the steel pipe 24, and the steel pipe 24 and the RC column 10 are reliably coupled to each other through the stud bolts 30.

On the other hand, the I-shaped steel 26 of the connection unit 22
As shown in FIG. 3, the lower side and both sides of the I-shaped steel 26 are covered with the bending form 16 on the outer side of, and concrete is placed in the bending form 16 as described above. To be done.
In addition, stud bolts 32 are provided on both upper and lower sides of the I-shaped steel 26, and the I-shaped steel 2 is inserted through the stud bolts 32.
6 and the RC beam 14 are securely coupled.

In the column / beam mixed structure of the present embodiment having the above-mentioned structure, the general portion of the column 10 has an RC structure using the PC column form 12, and the general portion of the beam has a U-shaped cross section. By adopting the RC structure using the bent form 16
Sufficient seismic performance can be secured and construction costs can be reduced significantly. Also, in this way, the pillar 10 and the beam 1
Since most of 2 has the RC structure, it is possible to significantly reduce the construction cost as compared with the conventional S structure or the RC structure in which the pillar is the RC structure and the beam is in the S structure.

By the way, the general portion of the pillar 10 has an RC structure, and the general portion of the beam 14 is an RC structure using a bending form 16.
Even in the case of the structure, since the pillar 10 and the beam 14 are bonded to each other through the connection unit 22 having the S structure, the toughness of the bonded portion can be secured and sufficient strength can be obtained.

FIG. 4 shows another embodiment, in which the same components as those in the above-mentioned embodiment are designated by the same reference numerals and a duplicate description will be omitted. That is, FIG. 4 is a cross-sectional side view of an essential part corresponding to FIG. 1, in which the connection unit 22 is composed of a steel pipe 24 and an I-shaped steel 26a fixed to the end face of the RC beam 14 via a bolt 34. ..

When the RC beam 14 is joined to the column 10, the I-shaped steel 26a is welded to the steel pipe 24 and the connecting bracket 36 welded to the steel pipe 24 is
It is adapted to be fixed to the web of shaped steel 26a via bolts and nuts (not shown).

Therefore, in this embodiment as well, it is possible to improve the earthquake resistance and reduce the construction cost similarly to the above-mentioned embodiment, and the connection unit 22 is divided by the steel pipe 24 and the I-shaped steel 26a. Therefore, when transporting the pillar 10, the steel pipe 24
Since it is possible to prevent the I-shaped steel 26a from protruding to the outside of the column, the transportability of the column 10 is significantly improved.

In the above embodiment, the case where the RC beam 14 is constructed by using the bending form 16 as shown in FIG. 3 is disclosed. However, instead of the bending form 16, FIG. As shown in Fig. 5, R is formed by using a precast concrete skeleton / framework 38 in which the main beam and the stirrup are embedded in the U-shaped section.
The C-beam 14 may be constructed.

[0022]

As described above, in the column / beam mixed structure of the present invention, the general portion of the column is a reinforced concrete structure, and the general portion of the beam is a precast concrete formwork having a U-shaped cross section, Alternatively, by using a reinforced concrete structure that uses a frame-combined formwork composed of this, and by using a steel frame structure for the joints of columns and beams, it is possible to secure the toughness of these joints and ensure sufficient seismic performance. The excellent effect of being able to achieve a significant reduction in construction costs is achieved.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1 showing an embodiment of the present invention.

FIG. 3 is a sectional view taken along line BB in FIG. 1 showing an embodiment of the present invention.

FIG. 4 is a side sectional view of an essential part corresponding to FIG. 1, showing another embodiment of the present invention.

FIG. 5 is a sectional view corresponding to FIG. 3 showing another embodiment of the present invention.

[Explanation of symbols]

10 pillars 12 PC pillar formwork 14 Beams 16 Bending formwork 22 Connection unit (joint portion) 24 Steel pipe 26, 26a I-shaped steel 38 Body-use formwork

Claims (2)

[Claims] 1. A general portion of a column is a reinforced concrete structure, a general portion of a beam is a reinforced concrete beam using a precast concrete formwork having a U-shaped cross section, and a joint portion of the column and the beam is a steel structure. The mixed structure of pillars and beams characterized by the above. 2. The mixed structure of pillars and beams according to claim 1, wherein the precast concrete formwork is a formwork that also serves as a skeleton.