JPS62284844A - Pillar/beam connection structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 3. Detailed description of the invention (industrial application field) This invention is formed from a concrete column and a steel beam.
In particular, it relates to the column-beam joint structure of columns inside buildings.

(Problems to be Solved by the Invention) In recent years, methods of constructing frames from precast concrete columns and steel beams have been proposed for the purpose of rationalizing the construction of reinforced concrete structures, but it is difficult to connect PC columns and steel beams. Since the section is a concrete column, it is necessary to arrange the reinforcement so that it does not interfere with the reinforcement arrangement such as the main reinforcement of the column.

This invention was made primarily for the purpose of making the joint between a PC column and a steel beam into a reinforced concrete structure and simplifying the structure.It is a structure in which opposing steel beams are connected at the top of a PC column using special metal fittings. This is an attempt to solve this problem.

(Means for Solving the Problems) In the present invention, column reinforcement is arranged by connecting opposing steel beams to each other using a joining hardware having a flat plate portion at both ends for joining with flanges of the steel beams. form a simple joint structure that does not interfere with

The columns are mainly made of precast concrete with main reinforcing bars and tie bars embedded in them, and steel beams are installed at their upper ends, facing in two directions and spaced apart from each other.

A joining hardware is installed across the upper and lower flanges of the steel beams facing each other in one direction, and the flat plate portion is joined to the flanges with bolts to connect the steel beams.

(Example) The present invention will be described below with precast concrete column beams 2, 2.
Column-beam joint A (
The structure of joint part A) is shown below.

In the case of precast concrete, column 1 is shown in Figure 1-m,
The main reinforcement 1a and the tie reinforcement 1b are embedded as shown in v, and the main reinforcement 1
a projects upward from the concrete upper surface of column 1.

The steel beams 2, 2 are installed in two directions, either against the side of the column 1 as shown in Figure 1-■, or facing each other on the top surface of the column 1 as shown in V. is flange 2
A and 2a are mutually connected by a joining metal fitting 4 which is installed astride between them.

As shown in the figure, the joining hardware 4 is formed into a battledore bolt shape with flat plate parts 4a, 4a at both ends, and the flat plate part 4a
, 4a at flange 2a.

2a with bolts 5.

When the steel beams 2, 2 are butt-joined to the column 1 as shown in Fig.
A joining plate 6 connecting b and pillar 1 is buried in advance.

On the other hand, when the steel beams 2, 2 are placed facing each other on the column 1 as shown in FIG. Concrete is poured integrally with slab 7 between 2 and 2.

Note that the joining hardware 4 may have protrusions between the flat plate portions 4a to enhance adhesion.

FIG. 1 shows an example in which the joining hardware 4 is joined one step at a time between each of the upper and lower flanges 2a, 2a.
This is an example of joining when the bending stress acting on two ends of the steel beam is relatively small.

In this case, the magnitude of the bending stress can be accommodated by appropriately adjusting the number of joint metal fittings 4 as shown in (2) or (H).

■～■ are examples in which the steel beams 2, 2 are butted against the side of the column 1, and in this case, the steel beams 2, 2 are connected to the column 1.
butt the flat plate portions 4a, 4a of the joining hardware 4 to the flanges 2a, 2a, and connect the joining plates 1-6, 6 to the web 21.
) and 2b, respectively, to form a joint A by simply joining them with bolts 5.

Also, IV and V are examples in which the steel beams 2, 2 are placed on the upper end of the column 1, but in this case, the opposing flanges 2
After connecting the steel beams 2, 2 by connecting the steel beams 2, 2 by installing the joint metal fittings 4 between them a and 2a, and connecting the steel beams 2, 2 together with the slab 7,
Concrete is poured between the two to form the joint A. As shown in the figure, the main reinforcement 1a passes through the joint A and is reinforced there, and the tie reinforcements 3 are arranged around it.

In the embodiment shown in FIG.
This is a case in which two levels are joined to each stage in a, and is an example of joining a part where relatively large bending stress acts, such as the lower floor of a high-rise building. (2) shows an example in which the steel beams 2, 2 are butted against the column 1, and (2) shows an example in which the steel beams are placed on the column 1.

The embodiment shown in FIG. 6 is a case in which the joining hardware 41 is formed by integrally molding the joining hardware 4, 4 in two directions in the embodiment shown in FIG. in,
(2) is the adjacent flat plate portion 4'a.

4"a is integrated. 1 to ■ are steel beams 2,
2 is placed against the pillar 1, and ■ and ■ are the cases where it is placed on the pillar 1.

In this case, since the flat plate parts 4'a and 4'a in the two directions are on the same level, the steel beams 2 and 2 can also be installed on the same level, and a thin PC plate that also serves as the slab formwork can be easily set. It also has the advantage of improving workability and construction accuracy.

Although the present invention has been described above using an embodiment using a column 1 made of precast concrete, the column 1 can also be made of cast-in-place reinforced concrete.

(Effects of the Invention) The present invention is as described above, and by using a specially shaped joint metal fitting, it is possible to form a joint between a concrete column and a steel beam with a simple structure. This simplifies the process and makes it possible to improve workability.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention, and FIG. 1-I, I [, IV and FIG.
IV is a cross-sectional view, Fig. 1-m, v, Fig. 2-■. (2) and FIG. 6-m and v are longitudinal sectional views. A: Column/beam joint, 1: Concrete column, 1a: Main reinforcement,
1b: Stirrup, 2: Steel beam, 2a: Flange, 2b: Web, 3: Stirrup, 4. a': joining hardware, 4a, 4'a: flat plate part, 5: bolt, 6: joining plate, 7: slab. Figure 1 I Figure 1 ■ 1IE1W ■ Δ Shi2 Yoi 1 Figure ■ Figure 2 ■ Figure 2 ■ Figure 3! Fig. 3 I Fig. 3 I 3 Fig. ■ Fig. 3 Procedural amendment February 1q, 1981 1, 19 Ushi no Sushi R 061 Patent Application No. 128757 2 Name of the invention Column-beam joint Structure 3: Relationship with the amendment child case Patent applicant name (137) Kajima Corporation 4, agent address ■107 Shadow Akasaka Denwa, 5-21 Akasaka 6-chome, Minato-ku, Tokyo (586) 8' 741 (Insert the following sentence between lines 17 and 18 on page 4 of the 11 specification. “In the case of (2) Insert the following sentence between lines 10 and 11 on page 6 of the specification. The buried part in the concrete exerts a shear connector effect or a bearing plate effect, and the strength of the joint A is improved.In other words, the joint hardware 4 in two directions
．． If 4 is a separate body, only adhesion strength can be expected, but by integrating it, bearing pressure strength is added, so even if repeated stress is applied, the effect of preventing removal becomes greater.

Claims (1)

[Claims] (1) Connecting metal fittings with flat plate parts at both ends are installed across the flanges of steel beams installed at a distance from each other facing the upper ends of concrete columns, and the flat plate parts are bolted to the flanges. A column-beam joint structure that connects both steel beams.