JP3106881B2 - Mixed structure of reinforced concrete columns and steel beams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed structure of reinforced concrete columns and steel beams in a middle-to-high-rise building.

[0002]

2. Description of the Related Art In the construction of middle- and high-rise buildings, from the viewpoint of rationalization of construction and economic efficiency, a mixed structure using a reinforced concrete structure effective for compressive force as a pillar and a light-weight steel frame structure capable of forming a long span. Has attracted increasing attention in recent years. At the time of construction of this mixed structure, a column rebar assembly with end steel beams integrated into a beam joint of a rebar assembly from a column main bar and a hoop bar is assembled on the factory or on the ground around the site. After this column reinforcing bar assembly with end steel beams is built, a central steel beam is erected between the column reinforcing members with end steel beams, and then column concrete is cast.

[0003] In many cases, an iron plate closing plate which also serves as a column concrete formwork is provided in the column / beam joint to increase the rigidity of the joint.

[0004]

In the conventional mixed structure, the column rebar assembly with end steel beams needs to support the weight of the steel beams and horizontally support the steel beams. For this reason,
(1) From the aspect of supporting the weight of steel beams, the weight of the steel beams imposes restrictions on the diameter, number of columns, connection with hoop bars, etc., and conversely, the weight of the steel beams is limited. become.

(2) With respect to the surface for horizontally supporting the steel beam, the vertical accuracy of the column rebar assembly is lower than that of a steel column or the like due to an error in assembling. The height of the mounting position of the end steel beam to the column rebar assembly becomes uneven, and the horizontal support accuracy of the steel beam is not good. (3) The iron plate closing plate contributes to the rigidity when a horizontal load is applied, but may be separated from the column concrete due to the deformation of the joint portion, and the rigidity of the joint portion is reduced after the separation. However, there is a need for a solution.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a column rebar assembly with an end steel beam is assembled by using an L-shaped steel material instead of a column main bar, and thereby the column rebar assembly with an end steel beam is endured. The present invention is intended to improve the load performance and improve the vertical support accuracy of the column rebar assembly with end steel beams to improve the horizontal support accuracy of the steel beams, thereby solving the problems of the conventional method. Furthermore, when installing a steel plate closing plate at the column / beam joint, use a stud bolt with a head attached inside to prevent peeling from the concrete column and maintain the rigidity of the joint. Things.

That is, according to the present invention, L-shaped steel members arranged in parallel at the four corners of a column are connected to each other by an orthogonal band plate, and hoops are tied around the outer periphery other than the joint portion. The column rebar assembly with the end steel beam constructed by welding the upper and lower flanges of the beam to the upper and lower band plates via the angle steel is built in place, and between the column rebar assembly with the end steel beam. The present invention relates to a mixed structure of a reinforced concrete column and a steel beam, which are constructed by laying a steel beam and then casting column concrete.

The gist of the present invention is that an assembly of four L-shaped steel members, an appropriate number of band plates, and hoop bars is used in place of the conventional assembly of the column main bars and the hoop bars.

[0009] Since the frame composed of the L-shaped steel material and the band plate is assembled in the same manner as the steel frame structure, not only the load-bearing performance is improved but also the assembly accuracy is greatly improved and the vertical accuracy is improved as compared with the conventional steel bar structure. Is improved. As a result, the degree of freedom of the combination of the column rebar and the steel beam is greatly improved, and at the same time, the horizontal support accuracy of the steel beam to be installed is significantly improved.

As the L-shaped steel material used for the column reinforcing bar assembly of the present invention, besides ordinary angle steel, a steel plate obtained by bending a striped steel plate into an L-shape is used. In order to improve the adhesion to concrete, it is preferable to place a stud bolt with a head upright on the surface of the angle steel or the striped steel plate. For striped steel,
Normally, it is preferable to work so that the stripes are on the outside in view of the adhesion performance with concrete, but the reverse is also acceptable. The four L-shaped steel members are connected to each other by orthogonal band plates, and hoops are tied around the outer periphery thereof to form a quadrangular column-shaped column rebar assembly. The band plate is always mounted at predetermined positions above and below the connection portion, but may be mounted at other positions. At this time, naturally, the hoop streak is not bound around the outer periphery of the connection portion. In order to further improve the mechanical strength of the column rebar assembly, a tie plate is welded between diagonal L-shaped steel materials at an appropriate pitch.

Next, the two-direction end steel beam is attached to the column reinforcement assembly so as to penetrate the column reinforcement assembly, and the other two-direction end steel beam abuts on the existing end steel beam. Attached to the rebar assembly, a column rebar assembly with end steel beams is formed. Attachment of the end steel beam is performed by welding the upper and lower flanges of the end steel beam to the band plate attached to the predetermined position above and below the connection part through normal angle steel.
Ensure mounting accuracy. In addition, in the case of further arranging the column main reinforcement in addition to the L-shaped steel material, the column main reinforcement is welded upright to the upper and lower flange surfaces of the attached end steel beam. Also, when the opening of the joint is closed with an iron plate closing plate, an iron plate with a head stud bolt attached to the inside is welded to the side of the end steel beam so as to cover the periphery of the joint with the iron plate closing plate. .

[0012] The above-described column rebar assembly with end steel beams is assembled at a manufacturing factory or on the ground around the site, and the assembled column rebar assembly with end steel beams is built at the site. The central steel beam is erected between the column steel bar assemblies with end steel beams by ordinary high-tension bolt connections.
After that, as usual, installation of small beams, laying of floor iron plates, floor reinforcement, installation of stud bolts with heads on beams, installation of column formwork, casting of columns and floor concrete, The mold is removed from the mold to complete the mixed structure of the reinforced concrete columns and the steel beams of the present invention.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing embodiments of the present invention.

FIGS. 1A and 1B show an example of a mixed structure of a reinforced concrete column and a steel beam according to the present invention, wherein FIG. 1A is a longitudinal sectional view, FIG. (A) is a view as viewed from the arrow C, and (d) is a view as viewed from the arrow D in (a). (However, for easy understanding, (a) is shown as after concrete casting, and (b) to (d) are shown before concrete casting.) FIG. 2 is a cross section showing a corner of a reinforced concrete column of the present invention. FIG.

The construction procedure of the mixed structure of reinforced concrete columns and steel beams according to the present invention will be described with reference to the drawings. Although FIG. 1 shows a reinforced concrete column having a four-way connection, reinforced concrete columns having a two-way connection and a three-way connection are constructed in exactly the same manner.

(1) The L-shaped steel members 1 are arranged at the four corners of the pillar.
As the L-shaped steel material 1, a normal angle steel 1A shown in FIG.
In addition, L obtained by bending a striped steel plate shown in FIG.
A striped steel plate 1B is used. To improve the adhesion to concrete, stud bolts 9 with heads are erected on both the inner and outer surfaces of the angle steel 1A. The headed stud bolt 9 may be provided only on the outer surface, or may not be provided in some cases. It is preferable that the L-shaped striped steel plate 1B is processed so that the streaks are on the outside in view of the adhesion performance with concrete, but may be reversed. Although not shown, a stud bolt with a head may be provided.

(2) The band plate 2 is arranged at a predetermined position orthogonal to the L-shaped steel material 1, and the L-shaped steel material 1 is welded.
Are interconnected. The band plate 2 is always attached to the upper and lower positions of the connection portion, but may be attached to other positions. When it is desired to further improve the mechanical strength of the column rebar assembly, as shown in FIG.
The tie plate 8 is welded between the mold steel materials 1 at an appropriate pitch.

(3) The hoop bars 3 are bound around the outer periphery other than the connection portion to form a column reinforcing bar assembly.

(4) The end steel beam 5A is disposed so as to penetrate the connection part of the column reinforcing bar assembly, and the upper and lower flanges of the end steel beam 5A are welded to the band plate 2 via the angle steel 4. . The cross-end steel beam 5B intersecting with the end steel beam 5A is inserted into the opening of the connection part, and its tip is welded to the end steel beam 5A, and the upper and lower flanges are angled like the end steel beam 5A. 4 and welded to the band plate 2. Thereby, the column rebar assembly with four end steel beams 5A and 5B is formed. In the case of further arranging the column main reinforcing bar in addition to the L-shaped steel material 1, the column main reinforcing bar joint 7 is welded to the upper and lower flange surfaces of the attached end steel beams 5A, 5B to be erected.

(5) In the case where the opening of the joint is closed by the iron plate closing plate 6, the steel plate closing plate 6 on which the stud bolt 9 with the head is mounted on the inside covers the periphery of the end portion with the steel beam 5 at the end.
Weld to the sides of A and 5B.

The above operations (1) to (5) are performed on the ground on the factory or around the site.

(6) A column rebar assembly with end steel beams is erected at the site, and a central steel beam 5C is erected between the built column rebar assemblies with end beams by ordinary high-tension bolt joints. I do. A steel beam is erected between the girders, and a floor steel plate such as a corrugated steel plate is laid on it.

(7) Attach the headed stud bolts 9 to the upper surface of the steel beam, arrange the reinforcement for the floor concrete, and install the column formwork 10.

(8) After placing the column concrete 11 and the floor concrete 12, the column form 10 is removed and
A mixed structure of reinforced concrete columns and steel beams for the floor is completed.

[0025]

According to the present invention, since the L-shaped steel material is used as the column main reinforcing bar instead of the reinforcing bar and connected by a band plate to assemble in the same manner as the steel frame structure, the load bearing performance is improved as compared with the conventional reinforcing bar structure. The assembly accuracy is greatly improved, and the vertical accuracy is improved. As a result, the degree of freedom of the combination of the column rebar and the steel beam is greatly improved, and at the same time, the horizontal support accuracy of the steel beam to be installed is significantly improved. Further, in the case where a steel plate closing plate having a head and a stud bolt attached to the inside thereof is provided in the column / beam connection portion, peeling of the steel plate from the column concrete is prevented, and the rigidity of the connection portion does not decrease.

[Brief description of the drawings]

1 shows an example of a mixed structure of a reinforced concrete column and a steel beam according to the present invention, wherein (a) is a longitudinal sectional view, (b) is a view as viewed from the arrow B of (a), and (c) is (a). ) In the direction of arrow C, (d)
FIG. 3A is a view as viewed from the direction of the arrow D in FIG. (However, for easy understanding, (a) is shown as after concrete casting, and (b)-
(D) is shown as before concrete placement. )

FIG. 2 is a cross-sectional view showing a corner of a reinforced concrete column of the present invention.

[Explanation of symbols]

1 ··· L-shaped steel material, 2 · · · band plate, 3 · · · hoop reinforcement, 4 · · · angle steel, 5A · · · end steel beam, 5B · · · cross-end steel beam, 5C · · · central steel beam 6 ... iron plate closing plate, 7 ... column main reinforcement joint, 8 ... tie plate, 9 ...
Stud bolt with head, 10 ... pillar formwork, 11 ... pillar concrete, 12 ... floor concrete.

Claims (3)

(57) [Claims] 1. An L-shaped steel member arranged in parallel at four corners of a pillar is connected to each other by an orthogonal band plate, and a hoop is bound around an outer periphery other than the joint portion. Is welded to the upper and lower band plates via the angle steel, and the end-to-end steel beam-assisted column rebar assembly is erected at a predetermined position, and a steel beam is erected between the end-beam-assisted column rebar assemblies. After that, a mixed structure of reinforced concrete columns and steel beams made by casting column concrete. 2. A column with an end steel beam having a steel plate closing plate to which a stud bolt with a head is attached inside and welded to the side of the end steel beam at the end of the connection portion, and the periphery of the connection portion is closed by an iron plate closing plate. The mixed structure of a reinforced concrete column and a steel beam according to claim 1, wherein a reinforcing bar assembly is used. 3. A mixed structure of a reinforced concrete column and a steel beam according to claim 1 or 2, wherein a column reinforcing bar assembly with an end steel beam is used in which a column reinforcement is welded upright to the upper and lower flange surfaces of the end steel beam. .