JPH11210077A - CFT column-RC beam joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively transmit a tensile force applied to a beam to a column as a shaft member, end joints are formed at both ends of upper and lower main bars of an RC beam to form a CFT column. CFT to be combined with the connection
It is intended to provide a column-RC beam joint structure. SOLUTION: The present invention integrally joins a CFT column having a connection by a diaphragm and a web and an RC beam having an end connection in which beam main reinforcements are arranged in a predetermined shape and both ends are fixed to a steel frame. CFT column-RC beam joint structure
As a C beam, fix the upper and lower beam main reinforcement of the beam to steel plate by welding,
The upper and lower beam main bars of the beam are butt-welded to a vertical steel plate or welded with screws and the flange plate is welded to the opposite side of the steel plate in a state parallel to the beam main bar. The upper and lower beam main reinforcements of the beam are fixed to one end by two steel plates, and the other end is used as a joint with the CFT column. An H-shaped steel frame is formed by a web between the sleeves to form an end connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated construction method of RC structures in a high-rise house, and more particularly, to a CFT column in a high-rise house using CFT columns as columns and RC beams as beams.
The present invention relates to a joint structure of RC beams.

[0002]

2. Description of the Related Art As a construction method for a high-rise house, a laminated construction method of RC structure is mainly used. As the height of a high-rise house made of RC increases, designing columns with RC requires an increase in the cross-section of the columns, and there is a problem in that shear reinforcement and high density are limited. On the other hand, in order to give each dwelling unit flexibility in the future in terms of livability, it is feasible to extend the span between the pillars, but this imposes a greater burden on the pillars. growing.

[0003] In order to solve the above-mentioned problems, concrete-filled steel pipe columns (hereinafter referred to as CFT columns) used in high-rise office buildings are adopted as columns, so that the cross-sectional dimensions of the column cross section can be reduced. It has been considered to hold it down. Also, when trying to increase the span between columns, use high-strength rebar as a beam,
It is desirable to deal with this by using reinforced concrete beams (hereinafter referred to as RC beams) to be concrete. It has been found that in terms of comfort, it is better to use RC beams for the beams supporting the floor in terms of sound and vibration than to use steel beams.

[0004]

However, CFT columns, R
Even if the advantages of the C-beams are utilized while taking advantage of each of them, there is a structural difficulty in designing a column / beam joint that joins the two together. The present invention provides a method for effectively transmitting a tensile force applied to a beam to a pillar as a shaft member.
An object of the present invention is to provide a CFT column-RC beam joint structure in which end joints are formed at both ends of upper and lower main bars of a C beam and are connected to the joints of a CFT column.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an RFT having an end connection in which a CFT column having a connection made of a diaphragm and a web and main beams are arranged in a predetermined shape and both ends are fixed to a steel frame.
It is a joint structure of CFT column and RC beam that joins C beam and joint at the joint part. The concrete structure is as follows. Forming an H-shaped steel frame with a web to make an end connection, similarly RC
The upper and lower beam main bars of the beam are butt-welded to a vertical steel plate, and a flange plate is welded to the opposite side of the steel plate in a state parallel to the beam main bar, and the upper and lower steel plates are formed into an H-shaped steel frame with a web to end the steel. The upper and lower beam main reinforcements of the RC beam are fitted and connected to a sleeve having a shape arranged in a predetermined shape and fixed, and a space between both sleeves is formed into an H-shaped steel frame with a web to form an end connection, RC
The upper and lower beam main bars of the beam are sandwiched and fixed to one end with two steel plates, and the other end is joined to a CFT column to form an H-shaped steel frame between the upper and lower steel plates with a web to form an end connection. Doing and R
The upper and lower beam reinforcements of the C beam are passed through a vertical steel plate and screwed together. A flange plate is welded to the opposite side of the steel plate in a state parallel to the beam reinforcement, and the upper and lower steel plates are formed into an H-shaped steel frame with a web. It is characterized in that it is an end connection.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A CFT column-RC beam joint structure according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of a CFT column-RC beam joint structure according to the present invention. In the figure, 1 is a CFT column, and 2 is a long span RC beam joined to the CFT column. The CFT column 2 is of a normal form, a concrete 4 is filled in a square steel pipe 3 constituting the column, and a diaphragm 5 and a web 6 are arranged at predetermined positions for connecting RC beams. And the end connection 7 of the RC beam 2 by a high tension bolt or the like. Although the construction state of the subsequent RC beam 2 is not particularly disclosed, it is a normal RC construction method in which concrete is poured after surrounding the side and bottom of the beam main reinforcement reinforced with stirrup using a formwork. Will be formed. As described above, the final structure of the RC beam is the same as that of a normal RC beam. Therefore, the PC method in which concrete is cast in advance may be used, or prestressed concrete may be used. Is natural.

The details of the RC beam 2 are shown in a perspective view (A) and an arrow view (B) in FIG. RC beam 2
Is a normal RC as shown in the overall view of FIG.
Desired beam main reinforcement 1 required for upper part 8 and lower part 9 as well as beams
0 and 11 are arranged, and both ends thereof are supported by H-shaped steels 12 and 12 in a predetermined shape to form an end port 7. In the case of the present embodiment, the beam main reinforcing bars 10 and 11 are arranged on the surface of the flange 14 of the H-shaped steels 12 and 12 and are firmly integrated by welding, and the periphery of the beam reinforcing bar is reinforced by a stirrup 13. . FIG. 2B shows the arrangement of the beam main reinforcements 10 and 11. The upper beam main reinforcement 10 is H
Five rebars are arranged outside the flange 14 of the section steel 12 at regular intervals, and two and one rebar are arranged inside the flange 13. The lower beam main reinforcement 11 arranges each rebar symmetrically with the upper one, and the entire rebar is a stirrup 1
3 reinforced the periphery. In the above description, the end connection is formed by using a commercially available H-shaped steel, but it is naturally possible to form an H-shaped steel frame by replacing the H-shaped steel with a flange portion made of a steel plate and connecting it with a web. It is about to be considered.

Another embodiment of the RC beam 2 illustrated in FIG. 3 is a case where the beam main reinforcing bars 10 and 11 are arranged in one step. As shown in the overall view of FIG. 3 (A), the RC beam 2 is a one-stage reinforcing bar, and the beam main reinforcing bars 10 and 11 are not disposed on the surfaces of the upper and lower flanges 14 of the H-section steel 12 but end portions of the flanges. And is firmly integrated by welding, and the periphery of the beam rebar is stirrup 1
3 reinforced. FIG. 3B shows the arrangement of the beam main reinforcements 10 and 11. Upper beam reinforcement 1
No. 0 has four rebars arranged at regular intervals flush with the flange 14 of the H-shaped steel 12. In the lower beam main reinforcing bar 11, the respective reinforcing bars are arranged symmetrically with respect to the upper reinforcing bar.

Referring to FIG. 4, another embodiment of the RC beam 2 will be described with reference to a perspective view (A) and an arrow view (B) thereof. As shown in the overall view of FIG. 4A, the RC beam 2 of the present embodiment also has desired beam main reinforcing bars 10 and 11 required for the upper portion 8 and the lower portion 9 as in a normal RC beam. This is the same as the embodiment shown in FIG. But,
Both ends of the beam main reinforcement are enclosed and welded to a vertical steel plate 15, and a flange plate 1 is provided on the opposite side of the steel plate 15 from the beam reinforcement.
6 is fixed by welding and reinforced by ribs. The upper and lower flange plates 16, 16 are integrally connected by a web 17 to form an H-shaped steel frame 18, and the RC beam 2 serves as an end connection 7 with this. In the case of this embodiment, the beam main reinforcements 10 and 11 are firmly integrated with the steel plate 15 by butt welding. Referring to FIG. 4 (B), the arrangement of the beam main reinforcements 10 and 11 is such that a plurality of rebars are arranged at regular intervals outside the steel plate 15 in the upper beam main reinforcement 10, and a predetermined rebar is provided inside thereof. Is arranged. The lower beam main reinforcing bar 11 arranges each reinforcing bar symmetrically to the upper reinforcing bar, and the entire reinforcing bar is reinforced around by a stirrup 13. In the above-described structure, the reinforcing ribs are used at right angles to the flange plate in consideration of the case where the strength of the joining between the steel plate and the flange plate remains unreliable, but this is not necessary when the strength is sufficient. Further, the steel plate and the flange portion may be integrally formed of cast steel in advance.

Referring to FIG. 5, another embodiment of the RC beam 2 will be described with reference to a perspective view (A) and an arrow view (B) thereof. As shown in the overall view of FIG. 5A, the RC beams 2 are provided with desired beam main reinforcements 10 and 11 required for the upper part 8 and the lower part 9 in the same manner as a normal RC beam, and the both ends thereof are sleeved. At 19, the end connection 7 is formed by supporting in a predetermined shape.
The sleeve 19 is made of cast steel and is provided with a plurality of rebar insertion holes 20 in accordance with the arrangement requirements of the main beam reinforcement.
The rebar insertion hole 20 is provided with a plurality of inlets 21 for filling the mortar for fixing the rebar into the insertion hole as shown in the figure, and a predetermined beam main reinforcing bar is attached to the rebar insertion hole 20 of the sleeve 19. From above, the mortar is press-fitted to securely integrate the sleeve 19 and the beam main reinforcements 10 and 11. The upper and lower sleeves 19 are integrally connected by a web 22 to form an H-shaped steel frame 23, and the RC beam 2 serves as the end connection 7. FIG. 5B shows the arrangement of the beam main reinforcements 10 and 11. The upper beam main reinforcing bar 10 is inserted into a reinforcing bar insertion hole 20 so that a plurality of reinforcing bars can be arranged at regular intervals outside the sleeve 19, and a predetermined reinforcing bar is inserted and arranged inside the reinforcing bar insertion hole 20. Lower beam main reinforcement 1
Reference numeral 1 denotes each reinforcing bar arranged symmetrically to the upper one, and the entire reinforcing bar is reinforced by a stirrup 13 in the same manner as in the above examples.

Referring to FIG. 6, another embodiment of the RC beam 2 will be described. The RC beam 2 of the present embodiment has a normal R
Desired beam main reinforcing bars 10 and 11 required for the upper part 8 and the lower part 9 are arranged in the same manner as the other embodiments shown above, similarly to the C beam. In the case of the present embodiment, the main beams of the beam are arranged in one row, and both ends thereof are sandwiched between two steel plates 24 and 25. Each steel plate has a reinforcing bar connecting portion 26 formed at one end thereof, and the beam main reinforcing bar is housed in a semicircular groove formed in the reinforcing bar connecting portion 26 and is firmly fixed by a high tension bolt 27. I have. The other ends of the steel plates 24 and 25 are connected to a steel plate connection portion 28.
It is formed with a bolt hole so that it can be joined to a flange from the diaphragm of the CFT column with a high tension bolt or the like. The upper and lower steel plate bodies 29 sandwiching the beam reinforcement,
Reference numeral 29 designates an H-shaped steel frame 3 which is integrally connected by a web 30 therebetween.
1 is formed, and the RC beam 2 is used as an end connection 7 with this.

Referring to FIG. 7, another embodiment of the RC beam 2 will be described with reference to a perspective view (A) of the beam end portion and an arrow diagram (B) thereof. However, this embodiment is different from the case of the butt welding described with reference to FIG. 4 only in the connection state of the beam main reinforcement to the steel plate. In the RC beam 2 of the present embodiment, as shown in the overall view of FIG. 7A, desired beam main reinforcements 10 and 11 required for the upper part 8 and the lower part 9 are arranged similarly to the ordinary RC beam. This is the same as the embodiment shown in each of the above-described drawings, except that both ends of the beam main bar are screw connections 33 for fastening nuts through screw holes provided in the vertical steel plate 15 as shown. Is the feature. A flange plate 16 is fixed to the opposite side of the steel plate 15 from the main beam by welding, and is reinforced by ribs. The upper and lower flange plates 16, 16 are integrally connected by a web 17 to form an H-shaped steel frame 18, and the RC beam 2 serves as an end connection 7 with this. Referring to FIG. 4 (B), the arrangement of the beam main reinforcements 10 and 11 is such that a plurality of rebars are arranged at regular intervals on the outer side of the steel plate 15 in the upper beam main reinforcement 10, and a predetermined rebar is provided on the inner side. Is arranged. The lower beam main reinforcement 11 arranges each rebar symmetrically with the upper one, and the entire rebar is a stirrup 1
3 reinforced the periphery. In the above-described structure, the reinforcing ribs are used at right angles to the flange plate in consideration of the case where the strength of the joining between the steel plate and the flange plate remains unreliable, but this is not necessary when the strength is sufficient. Further, the steel plate and the flange portion may be integrally formed of cast steel in advance. With respect to the form of the screw connection 33, various types such as a method of cutting the end of the beam main bar into a normal nut and a method of using a screw rebar and screwing can be adopted, and there is no limitation. Not something.

According to the present invention, as described in detail in the above embodiments, a CFT column having a connection made of a diaphragm and a web and a beam main reinforcement are arranged in a predetermined shape, and an end connection in which both ends are fixed to a steel frame. Since the joint structure of the CFT column and the RC beam that joins the RC beam with the joint at the joint part, the tensile force applied to the long span RC beam can be effectively applied to the CFT column which is a shaft member with a small cross section. It can be transmitted. As a result, it is possible to establish the RC construction method in a high-rise house utilizing the respective advantages of the existing CFT columns and RC beams.
It should be noted that the present invention is not limited to the above-described embodiment at all, and is included in the scope of the present invention without departing from the spirit of the present invention.

[0014]

According to the present invention, a CFT column having a connection made of a diaphragm and a web and an RC beam having an end connection in which beam main reinforcements are arranged in a predetermined shape and both ends are fixed to a steel frame are integrally formed at the connection. Because of the joint structure of CFT columns and RC beams to be joined, as a construction method for high-rise houses, the tensile force that the beams need to bear even if the span between each column is increased should be Through the connection of the column, it can be reliably transmitted to the column having a small cross section and strong shearing force. Also, according to the present invention, structurally,
Since a mechanical joint at the site is possible, the construction efficiency is improved, the reliability is high in terms of quality, and the effect of reducing the cost by being able to cope with the conversion of the beam to a PC can be exhibited.

Further, in the present invention, as a specific configuration, the upper and lower beam main reinforcements of the RC beam are fixed to the steel plate by welding, and the upper and lower steel plates are formed into an H-shaped steel frame with a web to form an end connection. Therefore, the stress applied to the column main reinforcement can be reliably transmitted to the column with a simple structure in which the column main reinforcement is welded and fixed to the steel plate. Similarly, the upper and lower beam reinforcements of the RC beam are butt-welded to a vertical steel plate, and a flange plate is welded to the opposite side of the steel plate in a state parallel to the beam reinforcement, and the upper and lower steel plates are formed into an H-shaped steel frame with a web. Since the upper end and the lower end are used as joints, the stress of the upper and lower two-step beam main reinforcement can be equally received by the flange plate located at the middle on the opposite side of the steel plate, ensuring the transmission of stress. I have to.

Also, the upper and lower beam main reinforcements of the RC beam are fitted and connected to a sleeve having a shape arranged in a predetermined shape and fixed, and an H-shaped steel frame is formed between both sleeves by a web to form an end connection. It is also possible to join the end connection with the beam main reinforcing bar without welding, and furthermore, fix the upper and lower beam main reinforcing bars of the RC beam to one end thereof with two steel plates and fix the other end to the CFT. By forming an H-shaped steel frame between the upper and lower steel plates with a web at the joint with the column and using it as an end joint, it is possible to achieve the joint of the end joint with only the steel plate and high tension bolts, The upper and lower main beams of the RC beam are passed through the screw holes provided in the vertical steel plate and screwed. A flange plate is welded to the opposite side of the steel plate in a state parallel to the main beam, and the H-shaped steel frame is used between the upper and lower steel plates with a web. Formed at the top and bottom, making beam processing simple and cost effective, and at the top and bottom Stress of the upper and lower two stages of beam main reinforcement can be uniformly received by the flange plate which is located in the middle on the opposite side of the steel plate disposed Re respectively, it is possible to achieve the effect that ensures the transmission of stresses.

[Brief description of the drawings]

FIG. 1 is a perspective view of a joint structure between a CFT column and an RC beam according to the present invention.

FIG. 2 is an overall perspective view and a side view of an RC beam according to the present invention.

FIG. 3 is an end perspective view and a sectional view of another RC beam according to the present invention.

FIG. 4 is an overall perspective view and a side view of another RC beam according to the present invention.

FIG. 5 is an overall perspective view and a side view of another RC beam according to the present invention.

FIG. 6 is an overall perspective view and a side view of another RC beam according to the present invention.

FIG. 7 is an end perspective view and a side view of another RC beam according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CFT column 2 RC beam 3 Steel pipe 4 Filled concrete 5 Diaphragm 6, 17, 22, 30 Web 7 End connection 10, Beam main bar 12 H-shaped steel 13 Stirrup 14 Flange 15 Steel plate 16 Flange plate 18, 23, 31 H-shaped steel frame 19 Sleeve 20 Rebar insertion hole 21 Injection port 24, 25 Steel plate 26 Reinforcement connection part 28 Steel plate connection part 29 Steel plate body 32 Cut groove 33 Screw connection

Claims (6)

[Claims] 1. A CFT column having a diaphragm and a web connection, an RC beam having an end connection in which beam main reinforcements are arranged in a predetermined shape and both ends fixed to a steel frame, and a CFT column and an RC beam connected by a connection portion. CFT pillar-RC beam joint structure to be joined together. 2. The CFT column according to claim 1, wherein the upper and lower beam main reinforcements are fixed to the steel plate by welding, and a space between the upper and lower steel plates is formed into an H-shaped steel frame by a web to form an end connection. RC beam joint structure. 3. An upper and lower beam main bar is butt-welded to a vertical steel plate, a flange plate is welded to the opposite side of the steel plate in a state parallel to the beam main bar, and an H-shaped steel frame is formed between both flanges by a web. The CFT according to claim 1, wherein the CFT is used as a connection.
Column-RC beam joint structure. 4. An upper and lower beam main bar is fitted and fixed to a sleeve having a shape arranged in a predetermined shape and fixed, and an H-shaped steel frame is formed between both sleeves by a web to form an end connection. The joint structure of a CFT column-RC beam according to claim 1. 5. The upper and lower beam main reinforcements are sandwiched and fixed to one end of two steel plates, and the other end is joined to a CFT column to form an H-shaped steel frame between the two steel plates with a web to form an end joint. The joint structure between a CFT column and an RC beam according to claim 1, wherein the joint is a mouth. 6. The upper and lower beam main bars are screwed together by passing through a vertical steel plate, a flange plate is welded to the opposite side of the steel plate in a state parallel to the beam main bar, and an H-shaped steel frame is formed between both flanges by a web. The CF according to claim 1, wherein the CF is a part connection.
T column-RC beam joint structure.