JP2002332691A - Joint construction between column and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint construction between a column and a beam with which the main reinforcement can be arranged even to a position of a column joint of the steel frame. SOLUTION: A steel frame 2 at a joint portion where a second joint reinforcing bar 5b is welded to a lower flange 7 is placed to a coaxial shape at the top end of a steel pipe 4 erected on a pile footing 11, and the same work is performed for other adjacent columns. A steel beam 8 is elected on a bracket 2a opposite to the neighboring joint of the steel frame 8, after welding an end portion of the second joint reinforcing bar 5a to the upper flange 6 of the joint steel frame 2, the unit of the first joint reinforcing bar 3a is inserted from the above to the joint 10, and concrete 9 is filled up to the top of the upper flange 6. A stop formwork 15 is provided around the position of placing an upper steel pipe 13 at the upper portion of the steel beam 8, and a floor slab 18 is formed. Upon completion of one floor, a new steel pipe 4 is placed at the upper portion of the joint of the steel frame in a coaxial shape with the steel pipe 4, and an air gap 17 between the lower end portion and the stop formwork 15 is adhered with concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a building, and more particularly to a connection structure of a joint between a column and a steel beam.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional column and beam connection structure. Reference numeral 51 denotes a filled concrete steel pipe column, reference numeral 52 denotes a connection portion steel frame, reference numeral 53 denotes a joint reinforcing bar, and reference numeral 54 denotes a steel pipe. Concrete 55 is filled in steel pipes 54 provided vertically above and below the connection part steel frame 52 to form a filled concrete steel pipe column 51, and a plurality of connecting reinforcing bars 53 are inserted through the connection part steel frame 52. And the steel pipes 5 connected vertically
4 so as to be inserted into the inside of the steel pipe 54 in the vertical direction along the inner periphery of the steel pipe 54.

[0003]

However, the connection 5
6 is provided with the connection part steel frame 52, so that a part of the horizontal cross section of the connection part 56 is closed, so that the connection capable of inserting the connection part 56 is provided. Reinforcing bar 53
The arrangement position of the reinforcing bars is limited, and the arrangement interval of the reinforcing bars is generally limited. Therefore, the joining reinforcing bars 53 that can be arranged in the steel pipes 54 constituting the filled concrete steel pipe columns 51 are provided. Will also be limited. Therefore, in order to increase the joint strength between the connection portion steel frame 52 and the filled concrete steel pipe column 51, the joint rebar 5
When it is desired to increase the number of the steel pipe columns 3, the filled concrete steel pipe columns 51
Take measures such as increasing the diameter of

In view of the above circumstances, the present invention provides a connection structure between a column and a beam, in which joint rebars can be arranged at all positions of the cross section of the connection portion of the column. The purpose is.

[0005]

According to a first aspect of the present invention, there is provided a column and beam connection structure comprising: a connection portion steel frame having a beam joining bracket disposed in the connection portion; And a plurality of first joining rebars, both ends of which are inserted into the upper and lower steel pipes by penetrating the connection part, and filled inside the steel pipe and the connection part. In the joint structure of a column and a beam, the ends of a plurality of second joint reinforcing bars are joined to an upper flange and a lower flange of the joint portion, thereby forming a vertical joint in the upper and lower steel pipes. It is characterized by being inserted in the axial direction.

According to a second aspect of the invention, there is provided a connection structure between a column and a beam, wherein the second joint reinforcing bar is provided with holes provided in an upper flange and a lower flange instead of being joined to the upper flange and the lower flange. It is characterized by being provided so as to penetrate and extend in the vertical axis direction in a steel pipe connected vertically above and below the connection portion steel frame.

[0007] A third aspect of the present invention is characterized in that the column is a column made of reinforced concrete.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows details of a column and beam connection structure according to the present invention. Reference numeral 1 denotes a filled concrete steel pipe column, reference numeral 2 denotes a connection portion steel frame, reference numeral 3a denotes a first joint reinforcing bar, reference numeral 4 denotes a steel pipe, and reference numerals 5a and 5b denote second joint reinforcing bars. As is clear from FIG. 1, inside the steel pipe 4 constituting the filled concrete steel pipe column 1, there are provided first joining reinforcing bars 3a extending in the vertical axis direction and arranged at intervals along the inner periphery. Steel pipes 4 inserted vertically through the gap of the steel frame 2
The second joint rebars 5a and 5b, each of which protrudes inward and whose one end is welded to the joint steel frame 2, have the other end connected vertically above and below the joint steel frame 2. Projecting into the steel pipes 4 which are located.

The filled concrete steel pipe column 1 is a filled concrete column made by placing concrete 9 in the hollow portion of the steel pipe 4. A mouth steel frame 2 and a plurality of first joint reinforcing bars 3a are provided.

The connection part steel frame 2 is formed in a cross shape, and a bracket 2a for joining steel beams to four ends thereof, and a center portion of the cross shape of the bracket 2a having substantially the same diameter as the steel pipe 4 are formed. And a steel pipe portion 2b provided so as to cover (see FIG. 1B). At the position on the upper flange 6 of the bracket 2a and coaxial with the web, the lower end of the second joint reinforcing bar 5a and the lower flange 7 on the second flange 5a
The second joint reinforcing bar 5b is positioned coaxially with the joint reinforcing bar 5a.
The upper ends of the steel pipes 4a and 5b are coaxially formed in the vertical axis direction.
Are provided to communicate with the inside upward or downward. In this way, the second joint reinforcing bars 5a and 5b are positioned above and below the connection portion steel frame 2, respectively, and secure a coaxial and continuous shape through the web of the bracket 2a. Become.

Although the second joint reinforcing bars 5a and 5b are arranged on the upper flange 6 and the lower flange 7 in terms of the arrangement of the reinforcing bars on the steel pipe 4, the web of the bracket 2a is provided. When the upper flange 6 is not coaxial with the second joint reinforcing bars 5a and 5b,
The continuity of the second joint reinforcing bars 5a and 5b is secured by fixing a reinforcing bar, a steel plate or the like between the lower flange 7 and the lower flange 7 by welding. Alternatively, a hole is provided in the upper flange 6 and the lower flange 7 at a position where the second joint reinforcing bars 5a and 5b are installed, and a first joint reinforcing bar provided with a projection having functions of positioning in the height direction and preventing falling off. By devising, for example, inserting 3a, continuity of the joint reinforcing bars arranged in the connection part 10 is ensured.

On the other hand, the plurality of first joint reinforcing bars 3a
It is arranged in the connection part 10 in a state where it is unitized into a cylindrical shape having a diameter enough to fit inside the steel pipe 4 by the auxiliary muscle 3b. As shown in FIG. 1B, the first joint reinforcing bars 3a and the second joint reinforcing bars 5a and 5b are arranged at equal intervals in the circumferential direction.

At this time, when one of the auxiliary reinforcing bars 3b attached to the first connecting reinforcing bar 3a is to be built into the connection portion 10 when the unitized first connecting reinforcing bar 3a is installed, The auxiliary bar 3b is connected to the upper flange 6 of the connection part steel frame 2.
Is mounted at a position where the height position of the first joint reinforcing bar 3a can be secured. As described above, two auxiliary reinforcing bars 3b are provided for the purpose of having two functions of securing the unit shape of the first joining reinforcing bar 3a and securing the position in the height direction at the time of erection. Things.

When the first joint reinforcing bar 3a is unitized, a part of the horizontal section of the steel pipe 4 is closed so that the first joint reinforcing bar 3a can pass through the connection portion steel frame 2. The first joint reinforcing bar 3a is unitized after the bracket 2a of the connection portion steel frame 2 is disposed at a position where it is to be avoided in advance. Thereby, one end of the first joint reinforcing bar 3a is connected to the connection portion steel frame 2.
And the other end of the first joint reinforcing bar 3a is inserted into a steel pipe 4 newly provided on the upper part of the connection portion steel frame 2. Becomes

Next, an example of the construction method of the present invention will be described. After the steel pipe 4 is built on the pile foundation 11 (FIG. 2 (a)
2), the second connection reinforcing bar 5b is welded to the lower flange 7 of the connection portion steel frame 2 which is arranged upside down in advance and welded (see FIG. 2 (b)). The top and the bottom are placed back so that they are coaxial with the upper end of the steel pipe 4 (see FIG. 2C). In addition, the steel pipe 4 and the connection part steel frame 2 are similarly installed at the position where the other filled concrete steel pipe column 1 is to be constructed. Thereafter, the steel beams 8 are erected on the brackets 2a of the joints 2 adjacent to each other by fastening bolts and nuts using splice plates (see FIG. 2D).

Thereafter, the end of the second joint reinforcing bar 5a is coaxial with the upper flange 6 of the connection portion steel frame 2 so as to be coaxial with the second joint reinforcing bar 5b welded to the lower flange 7. After welding (see FIG. 2 (f)), the auxiliary muscle 3b
The unit (see FIG. 2 (e)) of the first joint reinforcing bar 3a temporarily assembled by using the auxiliary reinforcing bar 3b of the unit is mounted on the upper flange 6 of the connection portion steel frame 2. Then, it is inserted into the connection part 10 from above the connection part steel frame 2 (see FIG. 2 (g)). In this state, concrete 9 is poured from above the connection part steel frame 2 and the steel pipe 4
Is filled to form the filled concrete steel pipe column 1. Further, the concrete 9 is filled up to the top end of the upper flange 6 of the connection portion steel frame 2, so that the lower half of the first joint reinforcing bar 3 a, the connection portion steel frame 2, and the filled concrete steel pipe The column 1 is integrally fixed (see FIG. 2 (h)).

On the other hand, a floor form (not shown) is installed on the upper part of the steel beam 8 which has been temporarily provided, slab reinforcements 14 are provided, and future work is performed on the upper part of the connection part steel frame 2. In FIG. 1, after a stop formwork 15 is provided around the position where the new steel pipe 4 is placed, cast-in-place concrete 16 is cast to form a floor slab 18 (see FIG. 1A).

As described above, after one floor is completed, the first projecting portion projecting from the upper flange 6 of the connection portion steel frame 2 is obtained.
And the upper part of the connection part steel frame 2 so as to be coaxial with the steel pipe 4 provided at the lower part of the connection part steel frame 2. A new steel pipe 4 is placed. Thereafter, after sufficient positioning with respect to the steel pipe 4, a gap 17 between the lower end portion thereof and the stop form 15 used for forming the floor slab 18 is fixed by concrete. Thereafter, the next floor is constructed by repeating the same operations as those described above.

In this embodiment, the filled concrete steel column 1 is used as the column, but a reinforced concrete column 19 may be used. In this case, the first joint reinforcing bar 3
a and the second joint reinforcing bars 5a and 5b need to be continuous over the entire length of the column. Therefore, the basics 11
It is necessary to form a lap joint between the reinforcing bar 12 provided to connect the reinforced concrete columns 19, the lower end of the first connecting reinforcing bar 3a, and the second connecting reinforcing bar 5b (see FIG. 3). .

Further, the upper end of the first joint reinforcing bar 3a and the second joint reinforcing bar 5a provided on the steel pipe 4 located below the joint steel frame 2, and the upper part of the joint steel frame 2 Between the lower end of the first joint reinforcing bar 3a provided in the steel pipe 4 and the second joint reinforcing bar 5b.
It is necessary to form a lap joint.

Further, in the construction stage, a column form 20 for placing concrete 9 on the reinforced concrete column 19 is used.
There is also a method of temporarily supporting the connection part steel frame 2 using
In a reinforced concrete column 19, a discarded steel pipe having a member length capable of temporarily supporting the connection part steel frame 2 is previously provided,
This may be performed by a method such as temporary support.

According to the above-described structure, the second joint reinforcing bars 5a and 5 can be disposed in the joint 10 at the position where the joint steel 2 is erected. It is not necessary to increase the number of the first joint reinforcing bars 3a through which the second concrete bar 2 is inserted, and it is not necessary to increase the diameter of the filled concrete steel tubular column 1 for the purpose of increasing the first joint reinforcing bars 3a. High can be avoided.

The upper and lower flanges 6 and 7 of the connection part steel frame 2 are directly connected to second joint reinforcing bars 5a and 5b.
, The bending strength of the filled concrete steel tubular column 1 can be increased by a simple structure and simple work that can be performed on site, and an effective external force is also effective in shear transmission with the connection portion 10. The structure of the connection part can be made strong against the action of

[0024]

According to the first aspect of the present invention, there is provided a joint between a column and a beam, and a joint having a beam-joining bracket disposed at the joint, and a vertically extending joint above and below the joint. Steel pipe, a plurality of first joining rebars whose both ends are inserted into the upper and lower steel pipes through the connection part, and concrete filled into the steel pipe and the connection part. In the joint structure of a column and a beam, the ends of a plurality of second joint reinforcing bars are joined to the upper flange and the lower flange of the joint steel frame, and the ends are connected in the vertical axis direction in the upper and lower steel pipes. Since each is inserted, not only can the bending strength of the column be increased with simple equipment, but also the joint structure that is strong against the effect of external force even in the shear transfer of the joint can be made. In addition, it is possible to dispose a reinforcing bar also at the position where the steel beam is erected. , There is no need to increase the number of first reinforcing bars penetrating the Joint portion, first to further penetrate the Joint portion
Since it is not necessary to increase the diameter of the column for the purpose of increasing the reinforcing bar, cost can be avoided.

According to the joint structure of the pillar and the beam of the second aspect,
Instead of joining the second joint reinforcing bar to the upper flange and the lower flange, the second joint reinforcing bar passes through holes provided in the upper flange and the lower flange, and is formed in a steel pipe connected vertically above and below the connection portion steel frame. Since the connection is provided in the vertical axis direction, the bending resistance of the column can be increased with the simple equipment as described above, and the connection is strong against the effect of external force even in the shear transmission of the connection. Can be part structure

According to a third aspect of the present invention, there is provided a connection structure between a pillar and a beam.
Since the pillar is a pillar made of reinforced concrete,
Similar to the above, it has a simple and rational structure and is excellent in workability, and simplification of work, labor saving, and reduction of construction cost can be achieved.

[Brief description of the drawings]

FIG. 1 shows details of a connection structure between a pillar and a beam according to the present invention.

FIG. 2 is a view showing a construction procedure of a connection structure between a pillar and a beam according to the present invention.

FIG. 3 shows details of a reinforced concrete column / beam connection structure according to the present invention.

FIG. 4 shows details of a conventional column and beam connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filled concrete steel pipe column 2 Steel part of connection part 2a Bracket 2b Steel pipe part 3a 1st joint reinforcement 3b Auxiliary reinforcement 4 Steel pipe 5a 2nd joint reinforcement 5b 2nd joint reinforcement 6 Upper flange 7 Lower flange 8 Steel beam 9 Concrete 10 Connection part 11 Pile foundation 12 Reinforcement 13 Upper steel pipe 14 Slab reinforcement 15 Stopping form 16 Cast-in-place concrete 17 Air gap 18 Floor slab 19 Reinforced concrete column 20 Column formwork 51 Column 52 Connection part steel frame 53 Reinforcing steel 54 Steel pipe 55 Concrete 56 Mouth

Continued on the front page F term (reference) 2E125 AA04 AA14 AA45 AA57 AA72 AB01 AB11 AB17 AC04 AC07 AC16 AE04 AE07 AF03 AG10 AG12 AG28 BB01 BB22 BD01 BE05 BE08 BF01 CA05

Claims (3)

[Claims] 1. A steel joint having a beam-joining bracket disposed at a joint, a steel pipe connected vertically above and below the steel joint, and both ends of the steel pipe inserted through the joint. In a column and beam connection structure comprising: a plurality of first joint reinforcing bars inserted into the upper and lower steel pipes; and concrete filled into the connection between the steel pipe and the connection, Ends of a plurality of second joint reinforcing bars are joined to the upper flange and the lower flange of the steel frame, and the second joint reinforcing bars are provided in the upper and lower steel pipes so as to extend upward or downward in the vertical axis direction, respectively. The structure of the connection between the pillar and the beam, characterized in that 2. The column and beam connection structure according to claim 1, wherein the second reinforcing bar is provided on the upper flange and the lower flange instead of being bonded to the upper flange and the lower flange. A joint structure of a column and a beam, wherein the joint structure is provided in a steel pipe vertically penetrating through a hole and connected vertically to the joint steel frame. 3. The joint structure between a column and a beam according to claim 1, wherein the column is a column made of reinforced concrete.