JP2004278177A - Structure and method for joining reinforced concrete column and steel-frame beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and surely rigidly join a reinforced concrete column and a steel-frame beam. <P>SOLUTION: An anchorage bar is welded to the end of the steel-frame beam 2, and the end of the steel-frame beam is directly embedded in a joint part along with the anchorage bar. A three-side frame-shaped bent bar 7 or an anchor bar with an anchor head is used as the anchorage bar. Otherwise, an end plate is welded to the beam end of the steel-frame beam, and the end of the steel-frame beam is directly buried in the joint part. A cotter plate is prewelded to the top surface and undersurface of the end of the steel-frame beam. In the execution of work for joining the reinforced concrete column and the steel-frame beam, the steel-frame beam is temporarily supported by a temporary support 9 so that the end of the steel-frame beam can be arranged in the joint part, and the reinforced concrete column 1 is formed, including the joint part, by placing concrete in a column form in that state, so that the end of the steel-frame beam can be directly embedded in the joint part concurrently with the formation of the reinforced concrete column. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joining structure and a joining method for rigidly joining a reinforced concrete column and a steel beam.
[0002]
[Prior art]
As is well known, a pure ramen structure of a reinforced concrete structure (RC structure), a steel frame reinforced concrete structure (SRC structure), and a steel frame structure (S structure) is the most common. RC construction is the most advantageous in terms of cost, but the economic span is about 6 m, so the columns must be densely provided, which is a constraint, making it difficult to secure a large space, and free design. The degree is not always high. Large spans are possible in S-buildings and SRC-buildings, but they are disadvantageous in terms of cost compared to RC-buildings and the construction period is long depending on the scale.
[0003]
Therefore, as a rational structure that can realize a large span economically while being based on RC structure, for example, as shown in Patent Literature 1 and Patent Literature 2, all or a part of the beam is formed by using RC columns as the RC structure. A composite structure has been proposed.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 4-7416 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-303558
In this type of composite structure, it is necessary to join reinforced concrete columns (RC columns) and steel beams (S beams), which are different types of structural members. There is also a disclosure about the structure. In Patent Literature 1, the main bar of the column is penetrated through the flange of the S beam and fastened and fixed with a fixing nut. In Patent Literature 2, a special connecting body is driven into the connection portion to connect the same. The S beam is bolted to the body.
[0006]
[Problems to be solved by the invention]
However, the joining structure disclosed in Patent Literature 1 is difficult in terms of workability because the joining operation is very laborious and troublesome. In addition, the joint structure disclosed in Patent Document 2 requires not only a special connection body but also a pre-construction of the RC column in a state where the connection body is attached to the connection portion. The construction is difficult and the construction period is long, and such a joining form is substantially a pin joint and cannot be regarded as a rigid joint.
[0007]
In view of the above, there has been a demand for the development of an effective and appropriate joining structure and a joining method capable of easily and surely rigidly joining an RC column and an S beam.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a structure for rigidly connecting a reinforced concrete column and a steel beam, wherein a fixing bar is welded to an end of the steel beam, and an end of the steel beam together with the fixing bar is connected to a connection portion. It is directly buried.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, a three-sided frame-shaped bending streak having an open side is employed as the fixing streak, and the plurality of bending streaks are arranged in the width direction of the steel beam. In the installed state, one side thereof is welded to the upper end and the lower end of the steel beam, respectively.
[0010]
According to a third aspect of the present invention, in the first aspect of the present invention, an anchor muscle having an anchor head at a distal end portion is adopted as the anchoring muscle, and a plurality of the anchor muscles are arranged side by side in the width direction of the steel beam. The ends are welded to the upper end surface and the lower end surface of the steel beam, respectively.
[0011]
The invention according to claim 4 is a structure for rigidly connecting a reinforced concrete column and a steel beam, wherein an end plate is welded to a beam end of the steel beam, and an end of the steel beam is directly buried in a connection portion. It is characterized by having.
[0012]
The invention of claim 5 is characterized in that, in the invention of claim 4, a cotter plate along the width direction of the steel beam is welded to the upper surface and the lower surface of the end of the steel beam.
[0013]
According to a sixth aspect of the present invention, when a reinforced concrete column and a steel beam are joined by the joining structure according to any one of the first to fifth aspects, the column rebar and the column formwork are constructed, and the steel beam is temporarily provided by a temporary support. By supporting and arranging the ends at the joints, placing concrete in the column form in that state and forming the reinforced concrete columns including the joints, the steel beams are formed simultaneously with the formation of the reinforced concrete columns. Is directly buried in the connection part.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a first embodiment of the present invention. (A) is an elevation view of a connection part, (b) is a plan view thereof, and reference numeral 1 is a reinforced concrete column (RC column), and 2 is a steel beam (S beam) made of H-section steel. Reference numeral 3 is a slab, 4 is an RC column on an upper floor to be installed later, 5 is a column reinforcing bar, and 6 is a reinforced concrete beam (RC beam) provided in a direction orthogonal to the S beam 2.
[0015]
In the present embodiment, the bending beam 7 as a fixing bar is welded to the end of the S beam 2, and the end of the S beam 2 and the bending bar 7 are directly embedded in the joint to form the S beam. 2 and the RC column 1 are directly and rigidly connected. The bending streaks 7 as fixing streaks in the first embodiment are formed in a three-sided frame shape (sideways U-shape) with one side opened, and the bending streaks 7 are arranged in plural in the width direction of the S beam 2. In the state of juxtaposition (three in the illustrated example), one side thereof is welded to the upper surface of the end of the S beam 2 and the lower surface of the end, respectively. As shown in the figure, a rib plate 8 may be welded to the end of the S beam 2 at a position to be the surface of the RC column 1 as necessary.
[0016]
In order to join the RC column 1 and the S beam 2 by the above-described structure, a bending bar 7 is welded to the end of the S beam 2 when the S beam 2 is manufactured, and the column reinforcing bar 5 of the RC column 1 and the RC beam are used. After arranging the reinforcing bars of the beam 6 and assembling the column formwork of the RC column 1 and the beam formwork of the RC beam 6, the S beam 2 is temporarily supported by the temporary support 9 and the ends thereof are connected. And a floor form is laid on the S beam 2. Then, concrete is poured into the column formwork, the beam formwork, and the floor formwork to form the RC columns 1 and the RC beams 6 including the joints, and the slab 3 is also integrally formed. As a result, at the same time that all of the RC columns 1, the RC beams 6, and the slabs 3 are formed, the ends of the S beams 2 are directly buried in the connection portions, and the S beams 2 are surely attached to the RC columns 1 by themselves. Will be rigidly joined to
[0017]
According to the joining structure and the joining method of the present embodiment described above, a fixing bar consisting of a simple bending bar 7 is welded to the end of the S beam 2, and the end of the S beam 2 is joined together with the bending bar 7. The S beam 2 is securely connected to the RC column 1 by simply burying the section directly in the connection, without requiring any special and complicated members to join them. It can be carried out very efficiently and at low cost in the same procedure as in the case of ordinary RC construction, and is far more compared with the joint structures shown in Patent Documents 1 and 2. Reasonable and effective.
[0018]
It is conceivable to omit the temporary support by the temporary support 9 only by supporting the end of the S beam 2 with respect to the connection, and this is not prevented if possible. If the structure of the joint is complicated, it is not a good idea. It is most reliable and practical to temporarily support the S beam 2 with the temporary support 9 as described above, so it is preferable to do so.
[0019]
FIG. 2 shows a modification of the first embodiment. In this case, anchor bars 10 are employed as fixing bars instead of the bending bars 7 described above. The anchor bar 10 has an anchor head 10a at the distal end, and a plurality of (three in the illustrated example) are arranged side by side in the width direction of the S beam 2 and their base ends are the S beams 2. These are welded to the upper end surface and the lower end surface, respectively. In this case as well, the S beam 2 can be rigidly joined to the RC column 1 very easily and securely, just like the above case.
[0020]
Next, a second embodiment will be described with reference to FIG. This means that the end plate 11 is welded to the beam end of the S beam 2 and, if necessary, the rib plate 12 is welded to a position on the surface of the RC column 1, omitting the fixing streaks in the first embodiment, The S beam 2 is joined to the RC column 1 only by burying the beam end directly in the connection portion, and the S beam 2 is extremely simply and securely attached to the RC column 1 in the same manner as described above. Can be rigidly connected to
[0021]
FIG. 4 shows a modification of the second embodiment, in which, in addition to providing the end plate 11, two cotter plates 13 along the width direction are provided on the upper end and the lower end of the S beam 2, respectively. The joint strength to the RC column 1 is further increased by welding.
[0022]
Although the embodiment of the present invention has been described above, the present invention provides a structure in which a beam end of an S beam to which a fixing streak or an end plate is welded is directly buried in a connection portion to be joined to an RC column, Various modifications and applications are possible without being limited to the above embodiment. For example, in the first embodiment, the anchoring streaks 10 having the three-sided frame-shaped bending streaks 7 and the anchor heads 10a are illustrated as the anchoring streaks, but other various types of anchoring streaks can be adopted. The attachment position and the number of fixing streaks with respect to the beam end may be arbitrarily set so as to secure a desired fixing strength. Also, various fixing streaks as exemplified in the first embodiment may be used in combination with the end plate 11 and the cotter plate 13 as exemplified in the second embodiment.
[0023]
【The invention's effect】
The invention according to claim 1 requires any special and complicated member by welding an anchoring bar to the end of the steel beam and directly burying the end of the steel beam together with the anchoring bar in the connection. The steel beam can be securely and rigidly connected to the reinforced concrete column without any troublesome work. In particular, the inventions of claims 2 to 3 ensure sufficient fixing strength by using a very simple and inexpensive fixing streak by employing a bending streak having a three-sided frame shape or an anchor streak having an anchor head as the fixing streak. Can be.
[0024]
According to the fourth aspect of the invention, the end of a steel beam having an end plate welded to the beam end is directly buried in the connection portion, so that any special and complicated members are required as in the first to third aspects of the invention. The steel beam can be securely and rigidly connected to the reinforced concrete column without requiring any complicated work. In particular, in the invention of claim 5, the joining strength can be further increased by welding the cotter plate to the upper surface and the lower surface of the end of the steel beam.
[0025]
According to the invention of claim 6, the steel beam is temporarily supported by the temporary support, and the end thereof is arranged in the connection part, and concrete is poured into the column formwork in this state to include the reinforced concrete column including the connection part. By forming it at the same time, the end of the steel beam can be buried directly in the joint at the same time as the formation of the reinforced concrete column, and therefore, it is extremely efficient and low cost in the same procedure as in the case of ordinary reinforced concrete construction be able to.
[Brief description of the drawings]
FIG. 1 is a view showing a first embodiment of a joint structure of the present invention.
FIG. 2 is a diagram showing a modified example of the same.
FIG. 3 is a view showing a second embodiment of the joining structure of the present invention.
FIG. 4 is a diagram showing a modified example of the same.
[Explanation of symbols]
1 reinforced concrete columns (RC columns)
2 Steel beams (S beams)
3 slab 4 reinforced concrete column (RC column)
5 Column reinforcement 6 Reinforced concrete beam (RC beam)
7 Bending process muscle (fixing muscle)
8 Rib plate 9 Temporary support 10 Anchor bar (anchoring bar)
10a anchor head 11 end plate 12 rib plate 13 cotter plate

Claims (6)

It is a structure for rigidly connecting a reinforced concrete column and a steel beam, and an anchoring bar is welded to the end of the steel beam, and the end of the steel beam together with the anchoring bar is directly buried in the connection. A distinctive joint structure between reinforced concrete columns and steel beams. Three-sided frame-shaped bending bars with one side open are adopted as anchoring bars, and the bending bars are arranged side by side in the width direction of the steel beam, and one side of the steel beam is The joint structure between a reinforced concrete column and a steel beam according to claim 1, wherein the reinforced concrete column and the steel beam are welded to an end upper surface and an end lower surface, respectively. Anchor bars having an anchor head at the distal end are employed as anchoring bars, and a plurality of such anchor bars are arranged side by side in the width direction of the steel beam. The joint structure between a reinforced concrete column and a steel beam according to claim 1, wherein the joint is welded to the lower surface. A structure for rigidly connecting a reinforced concrete column and a steel beam, wherein an end plate is welded to a beam end of the steel beam, and the end of the steel beam is directly buried in a connection portion. Joint structure between reinforced concrete columns and steel beams. The joint structure between a reinforced concrete column and a steel beam according to claim 4, wherein a cotter plate along a width direction of the steel beam is welded to an upper surface and a lower surface of the end portion of the steel beam. When joining a reinforced concrete column and a steel beam by the joining structure according to any one of claims 1 to 5, while constructing a column reinforcing bar and a column formwork, temporarily supporting the steel beam by a temporary support and fixing the end thereof. By arranging concrete in the column formwork in that state and forming a reinforced concrete column including the joint in that state, the end of the steel beam is formed simultaneously with the formation of the reinforced concrete column. A method for joining a reinforced concrete column and a steel beam, which is directly buried in a building.

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