JPH0711156B2 - Method for joining reinforced concrete columns and steel beams - Google Patents

Description

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

(Prior Art) Construction of the joints between the columns and the beams in a composite structure in which conventional columns are reinforced concrete structures and beams are steel frame structures is carried out by reinforced concrete columns (A) with each other as shown in FIGS. 6 and 7. The main beam (a) and the hoop bar (b) are assembled by penetrating the steel beam (B) so as to intersect with each other in two orthogonal directions, and concrete is placed.

(Problems to be solved by the invention) However, in the above-mentioned conventional construction method, the steel beam is penetrated so as to intersect in two directions orthogonal to each other of the reinforced concrete column, and the column main bar and the hoop bar are assembled to cast concrete. Since the columns and beams are joined, the stress of the steel beam is not sufficiently transmitted to the reinforced concrete columns, and the strength of the joint is weak and the toughness of the concrete is lacking.

The present invention has been proposed in view of the problems of the prior art, and an object thereof is to provide a joining method for joining a reinforced concrete column and a steel beam in which the strength and toughness of the joint are improved. In point.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the joining method for joining a reinforced concrete column and a steel frame beam according to the present invention is one in which the reinforced concrete column and the column are arranged in two directions orthogonal to each other. Above and below the joint with the pair of steel beams, upper and lower joint fittings formed by crossing cross-shaped flat steel plates with horizontal slots at each free end are arranged, and the middle of the joint In the section, an intermediate joint metal fitting, in which joint pieces are provided outside the four circumferences of a vertical strip-shaped main body made of vertical strip steel, is arranged so that the main pillar of the pillar is surrounded by the main body. Engage and weld the horizontal slotted holes at the free ends of the vertical steel plates to the respective flanges of the pair of steel frame beams that face each other, and join the joint pieces of the intermediate joining bracket to the webs of the pair of steel frame beams that face each other. After joining, place concrete at the joint It is characterized by doing.

(Operation) In the present invention, as described above, the vertical flat steel plates arranged above and below the joints between the reinforced concrete columns and the pair of steel beams arranged in the same column in two directions orthogonal to each other are cross-shaped. Since the horizontal slot at the free end of the flat steel plate in the joining metal fittings formed in a cross shape is welded by engaging with the flanges of each pair of steel beams facing each other, the bending stress of each pair of steel beams is reinforced concrete columns. Is transmitted to.

In addition, a pair of joint pieces, which are provided outside the four circumferences of the main character of the U-shaped type having a high strength and rigidity, which are formed of the vertical strip steel plates in the middle joint metal fitting, disposed in the middle portion of the joint portion, are arranged in pairs. Being joined to the web, the vertical shear forces of the steel beam are transmitted to the reinforced concrete columns.

Then, after joining each pair of opposing steel frame beams with each of the above-mentioned joining metal fittings, concrete is placed. At this time, the parts constituting each of the above-mentioned connecting metal fittings are composed of vertical plates. Since the concrete filling property is improved, and because the column main reinforcement is surrounded by the main character of the intermediate joint metal fitting, the restraining force of the concrete in the same part is increased, and the strength and toughness of the column-beam joint are improved. improves.

(Examples) The present invention will be described below with reference to illustrated examples.

FIG. 4 shows the upper and lower joining metal fittings (a), each pair of vertical strip steel plates each having a horizontal slot (2) at each free end and arranged in parallel at predetermined intervals. (1) (1),
(1 ') and (1') are crossed and connected in a cross shape.

In the illustrated embodiment, one of the vertical flat steel plates (1)
(1) extends over the entire length in the X direction, and the other vertical flat steel plates (1 ') (1') are outer pieces (1) extending in the Y direction from the outside of the central portion of the vertical flat steel plates (1) (1). 'A) (1'
a) and inner pieces (1'b) (1'b) arranged between the facing surfaces of the both vertical strip steel plates (1) (1),
The inner and outer pieces are welded (w) to the vertical flat steel plates (1) (1). The upper and lower joint fittings (a) are
It is produced by any method.

FIG. 5 shows an intermediate joining metal fitting (b), which is a square frame (3) composed of vertical strip steel plates, in which cross-shaped vertical vertical strip steel plates (4) and (4 ') are integrally joined. From the outer surface of the rectangular frame (3) of the mold body (5), a joint piece (6) is provided so as to project along the extension of the width-stop vertical strip steel plate (4), and the joint piece (6). A bolt hole (7) is bored in this.

In the illustrated embodiment, the rectangular frame (3) is divided into two on both sides in the Y direction of the widthwise vertical strip steel plate (4) in the X direction in which the joint pieces (6) are integrally formed at both ends. A pair of U-shaped vertical frame steel plates (4 ') are welded (w), and a pair of Y-direction vertical vertical band steel plates (4') is provided between the central portion of the width-stop vertical strip steel plate (4) and the U-shaped frames. Are welded (w), and the joint pieces (6) located on the extension of the width-stop vertical strip steel plates (4 ') are welded (w) to the outer surfaces of the U-shaped frames.

The intermediate joint metal fitting (b) may be manufactured by any other method.

Thus, above and below the joints between the reinforced concrete columns (A) and the pair of steel beams (B) (B ') arranged in both X and Y directions orthogonal to each other with respect to the columns (A), The joining metal fittings (a) are arranged respectively, and the vertical flat steel plates (1), (1), (1 ′) in the X direction and the Y direction of the respective joining metal fittings (a) are arranged.
The horizontal slot (2), which is cut at each tip of (1 '), is
The flanges (8) of the steel beams (B) and (B) facing each other in the Y direction and the Y direction are engaged with each other and welded.

Further, an intermediate joining metal fitting (b) is provided at an intermediate portion of the joining portion.
Is arranged so that the Ta-shaped main body (5) surrounds the column main bar (9), and the joint pieces (6) projecting from the four circumferences of the main body (5) are opposed in the X and Y directions, respectively. Steel beam (B)
(B) The webs (10) of (B ') and (B') are joined together by bolts (11) using the bolt holes (7), and the pillars are provided above and below the intermediate joining metal fitting (b). Attach the stirrups (12) surrounding the main stirrup (9).

After that, the concrete (13) of the pillar is placed and the reinforced concrete pillar (A) and steel beam (B) (B), (B ')
(B ') is joined.

(Effects of the Invention) According to the present invention, as described above, above and below the joint between the reinforced concrete column and each pair of steel beams arranged in two directions orthogonal to the same column, horizontal at each free end. An upper and lower joining metal fitting, which is formed by intersecting vertical flat steel plates lacking groove slots in a cross shape, is provided, and the horizontal slot at the free end of each vertical flat steel plate is engaged with a pair of opposing flanges of a steel beam. By joining and welding, the bending stress is transmitted from the steel beam to the reinforced concrete column, and at the middle part of the joint part, the joint piece protrudes outside the four circumferences of the T-shaped main body made of strip steel plate. A vertical shearing force of the steel beam is obtained by arranging the provided intermediate joining metal fitting so that the main body surrounds the column main bar and joining the joining piece to each web of a pair of steel beams facing each other. Are transmitted to the reinforced concrete columns and thus the steel beams and The purpose of this is to ensure the transmission of stress between the reinforced concrete columns.

Further, since each of the joining metal fittings is configured by vertically installing a flat plate, the filling property of the concrete at the time of placing concrete is improved, and at the same time, the concrete of the joining part surrounds the main pillar of the column The restraint force is increased by the mold body, and as a result, the proof strength and toughness of the joint between the reinforced concrete column and the steel frame beam are improved.

According to a second aspect of the present invention, a pair of vertical flat steel plates arranged in parallel with each other, in which the intermediate joining metal fitting is engaged with a flange of a steel frame beam at each free edge and welded and welded with horizontal groove holes, are formed. Cross-linking in a cross shape makes it possible to transfer bending stress between the steel beam and the reinforced concrete column, and a structurally reliable joint between the reinforced concrete column and the steel beam can be constructed. It is a thing.

According to a third aspect of the present invention, the intermediate joining metal fitting has a large rigidity in which a square frame made of a strip steel plate and a cross-shaped width stop strip steel plate for preventing deformation of the square frame are integrally coupled, In addition, from the outer surface of the rectangular frame in the T-shaped main body that surrounds the main pillar of the pillar, a joint piece having a bolt hole that is joined to the web portion of the opposite steel beam is projected from the outer surface of the rectangular frame in the extension direction of the width-stop steel plate. By constructing and installing the structure, the vertical shearing force of the steel beam can be transmitted, and a structurally rational joint between the steel concrete column and the steel beam can be configured.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a joint between a reinforced concrete column and a steel frame beam constructed by the method of the present invention. FIG. 1 is a view taken along the line II of FIG. 2 and FIG. 3, and FIG. View II-II
3 and FIG. 3 are perspective views of the upper and lower joining fittings, FIG. 5 is a perspective view of the intermediate joining fittings, and FIG.
FIG. 7 and FIG. 7 are respectively a cross-sectional plan view and a vertical cross-sectional view showing a joint between a reinforced concrete column and a steel frame beam constructed by the conventional method. (A) …… Reinforced concrete column (B) (B ′) …… Steel beam, (1) (1 ′) …… Vertical flat steel plate (2) …… Horizontal slot, (3) …… Square frame (4) (4 ') …… Cross-shaped vertical stop steel strip (5) …… Mainly in the shape of a letter, (6) …… Joint piece (7) …… Bolt hole, (8) …… Flange (9) …… Column main bar, (10) …… Web (11) …… Bolt, (13) …… Concrete

Claims (3)

[Claims] 1. A vertical flat steel plate in which horizontal groove holes are cut at each free end above and below a joint between a reinforced concrete column and a pair of steel beams arranged in the column in two directions orthogonal to each other. The upper and lower joint fittings formed by crossing in a cross shape are arranged, and the middle joint of the joint portion is formed by projecting joint piece pieces outside the four circumferences of the T-shaped main body made of vertical strip steel plate. The metal fittings are arranged so as to surround the column main bars around the main body, and the horizontal groove holes of the free ends of the vertical steel plates in the upper and lower joining metal fittings are engaged with and welded to the respective flanges of the pair of steel frame beams facing each other. At the same time, after joining the joint pieces of the intermediate joint metal fitting to the respective webs of the pair of steel beam beams facing each other, concrete is placed in the joint portions, and the joining method of the reinforced concrete column and the steel beam . 2. The upper and lower joint fittings are formed by crossing and connecting in a cross shape a pair of vertical flat steel plates arranged in parallel with each other, each free end edge of which is provided with a horizontal slot. Method for joining reinforced concrete columns and steel beams as described. 3. A rectangular frame composed of vertical strip steel plates, wherein a cross-shaped width stop vertical strip steel plate is integrally joined to form a cross-shaped vertical strip steel plate from the outer surface of the square frame. The method for joining a reinforced concrete column and a steel frame beam according to claim 1, wherein a joining piece having a bolt hole at its tip is provided in a projecting manner in the extension direction.