JPH079921Y2 - Joint structure between reinforced concrete column and steel beam - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a joint structure between a reinforced concrete column and a steel beam, and more specifically, a reinforced concrete column and a steel beam with good concrete filling properties and high strength. Regarding the joint structure with.

[Prior Art] Conventionally, a column-beam joint in which an intersection of steel beams integrated in a crossed state is arranged in a column head which is a beam joint, and the periphery of the intersection is surrounded by a plate serving also as a formwork As the structure, Japanese Patent Laid-Open No. 63
Those described in -14937 are known.

[Problems to be Solved by the Invention] However, in the above technique, since the flange portion of the steel frame beam covers most of the cross section of the joint portion, the gap between the form / plate plate portion and the steel frame beam becomes small, so that the joint portion Not only is it extremely difficult to pour concrete into the concrete, but it is also difficult to perform compaction work with a vibrator after pouring, and the filling properties of concrete are poor.

Therefore, as the concrete to be poured and filled, it is not possible to use high-quality hard-mixed concrete having a small amount of water, and there is a drawback that a high-strength joint cannot be obtained.

In addition, as described above, since the filling property of concrete is poor, even if a reinforcing member such as a stirrup or a reinforcing metal object is arranged to increase the strength of the joint portion, the filling property of concrete is further deteriorated. It has the drawback that the strength cannot be increased.

As means for solving these drawbacks or inconveniences, for example, a structure of cutting off the steel frame beam upper flange portion of the beam-column joint portion surrounded by the frame / plate portion can be considered. It turned out to be a problem.

[Object of the Invention] Therefore, an object of the present invention is to provide a column-beam joint structure in which the strength of the column-beam joint is sufficiently high, the filling property of concrete is good, and higher strength can be obtained. .

[Means for Solving the Problems] The inventors of the present invention have arrived at the present invention as a result of extensive studies to achieve the above object.

That is, in the joint structure between the reinforced concrete column and the steel beam according to the present invention, the H-shaped steel webs to be the steel beam in which the flanges at the ends are cut off at the position where the reinforced concrete column is formed, leaving the taper portion. And a combination of four plates having a L-shaped cross-section and having a L-shaped cross-section, which are attached to each other by a plate fixing member that is fixed to the web of the steel beam around the circumference of the joint. It is characterized in that it is surrounded by a pressure plate attached via a pressure plate fixing member fixed to the outer surface of the flange of the beam, and the column reinforcing bars are laid in the surrounding part, and concrete is placed.

In the present invention, it is preferable to form taper portions on both the upper flange portion and the lower flange portion of the steel frame beam, but they may be formed only on the upper flange portion if necessary.

The portion other than the tapered portion of the present invention may be cut off, or may be bent downward or upward by about 90 degrees. In this case, it may be formed in a tapered shape up to this folded thickness.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway sectional view showing an embodiment of a joint structure between a reinforced concrete column and a steel beam according to the present invention, and FIG. 2 is a partially cutaway side view of the same.

In the figure, 1 is a pillar, and in this embodiment, a main bar 2
Also, the pillar 1 is made of a reinforced concrete structure in which strips (not shown) are arranged and concrete 3 is cast, but the pillar 1 is not limited to a reinforced concrete pillar, and may be a precast concrete pillar or a steel pipe concrete pillar.

An intersection portion 5 of the steel beam 4 integrated in a crossing state is arranged at a column head portion which is a beam joint portion of the column 1. The steel beam 4
Is an H-shaped steel (including I-shaped steel) having a web 6, an upper flange portion 7 and a lower flange portion 8, and is formed in a cross shape as shown by integrally molding or welding a plurality of H-shaped steels.

In the upper flange portion 7 and the lower flange portion 8 of the steel beam 4,
Tapered portions 7A and 8A are formed respectively. The taper part 7
A and 8A have a taper shape as shown in the figure from the position surrounded by the plate / combination plate portion 9 described later to the direction of the center of the pillar which is the crossing portion 5 to a thickness almost equal to that of the web 6. .

Around the intersection 5 of the steel beam 4, a form / plate portion 9 having an L-shaped cross section is arranged. The formwork / plate portion 9 forms a column structure at a beam joint and also serves as a formwork during concrete pouring, and is fixed to the web 6 of the steel beam 4 by welding or bolting. It is fixed to the plate fixing member 10 by welding or bolt fastening. The form / plate portion 9 is not limited to the L-shape, and may be formed in a shape corresponding to the cross-sectional shape of the column 1. For example, when applied to a column, it preferably has an arc shape. Further, it may be one member or multiple members.

A pressure bearing plate 11 is provided above and below the beam joint, that is, at the joint between the joint and the pillar 1. The pressure bearing plate 11 is fixed to the pressure bearing plate fixing member 12 which is fixed to the upper flange portion 7 and the lower flange portion 8 by welding or bolt fastening or the like by welding or bolt fastening. It should be noted that the pillar 1 and the joint portion may be directly joined without using the pressure support plate 11, but it is preferable to use the pillar 1 and the joint portion in terms of integration and reinforcement.

Although one embodiment of the present invention has been described based on a structure in which four beams are joined to a pillar so as to cross each other in a cross shape, the present invention is not limited to this. When three beams are joined in a T shape to the pillar located at,
The present invention can be applied to column-beam joints having various configurations, such as a case where two beams are joined to a column located at a corner in an L-shape.

Further, as shown by the phantom line in FIG. 1, by disposing reinforcing members such as the stirrup 13 and the reinforcing metal member in the joint (only a part of each is shown), the strength of the joint can be further increased.

[Advantage of Invention] According to the present invention, since the taper portion is formed on the flange portion of the steel beam of the joint, the strength of the steel beam of the beam-column joint is maintained and the gap of the cross section of the joint is maintained. It can be made large, which not only facilitates concrete pouring, but also facilitates compaction with a vibrator or the like. Therefore, since it is possible to easily apply high-quality concrete with a small amount of water and a high kneading amount, it is possible to obtain a high-strength beam-column joint having high yield strength.

In addition, it is possible to easily arrange members such as reinforcing members and stirrups in the joint portion, and in this case as well, it is easy to place concrete and the filling property is good. In particular, the joint structure between the reinforced concrete column and the steel beam of the present invention is a structure in which the H-shaped steel webs that are the steel beams are cut away from each other so that the flanges at the end portions are cut off leaving the taper portion, and therefore, they are formed separately. Compared with the structure in which the joint portion is attached, there are fewer joining / welding portions in the structural material, there is less occurrence of insufficient strength due to defective welding, and there is an advantage that a more stable joining portion structure can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an embodiment of a joint structure between a reinforced concrete column and a steel frame beam according to the present invention, and FIG. 2 is a partially cutaway side view of the same. 1: Pillar 2: Main reinforcement 3: Concrete 4: Steel beam 5: Crossing 6: Web 7: Upper flange 7A: Taper 8: Lower flange 8A: Taper 9: Form plate / plate 10: Plate fixing member 11: bearing plate 12: bearing plate fixing member 13: stirrup 14: reinforcing metal

Claims (1)

[Scope of utility model registration request] 1. At the position where a reinforced concrete column is formed, webs of H-shaped steel, which are steel frame beams whose end flanges are cut off leaving a taper portion, are joined, and the circumference of the joined portion is the column diameter. Corresponding to the above, four combinations of the plate and plate having an L-shaped cross section attached via the plate fixing member fixed to the web of the steel frame beam and the bearing plate fixing member fixed to the outer surface of the flange of the steel frame beam. A joint structure between a reinforced concrete column and a steel beam, which is characterized in that it is surrounded by a bearing plate attached through, and that the reinforcing bars of the columns are laid in the surrounding part and concrete is placed.