JP3410854B2 - Column / beam joint structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of columns and beams which constitute a frame of a building.

[0002]

2. Description of the Related Art The invention disclosed in Japanese Patent Application Laid-Open No. 62-220627 filed by the applicant of the present invention as a prior art of the present invention is one in which a vertical gusset plate is attached to a cylindrical boss at the upper end of a column by welding. The vertical web portion of the beam made of H-shaped steel is fixed to the gusset plate with bolts. Further, the flange ring of this prior art is formed in a flat ring shape having a constant thickness.

[0003]

In the above-mentioned joining structure of the prior art, when the gusset plate welded to the tubular boss is connected to the web of the beam, the shearing force from the end of the beam causes the tubular shape to pass through the gusset plate. It is transmitted to the boss. In this case, an extra stress, that is, an eccentric bending moment, acts in proportion to the eccentric distance from the welding position of the gusset plate to the tubular boss to the joining bolt, which may deform the column.

When a plurality of gusset plates are attached to the side of the tubular boss, the gusset plates are welded to the tubular boss in advance at the factory. Therefore, depending on the number or position of the beams connected to the tubular boss, the gusset plate is welded. It is necessary to prepare a plurality of types of tubular bosses having different numbers or positions of attachment.

Therefore, an object of the present invention is to reduce the stress applied to the joint portion, improve the versatility of the joint column, and further reduce the weight of the flange ring to reduce the material cost. Is to provide the structure.

[0006]

In order to solve the above problems, the present invention provides a stiffener ring for joining a beam lower end to the outer circumference between a column upper end and a joint column attached to a panel zone of the column upper end. And a second flange ring that is externally fitted to the upper end of the column below the stiffener ring, and a second flange ring that is externally fitted to the lower end of the joint column at the upper side.
In a column-beam joint portion in which the stiffener ring or diaphragm is fastened to each other with bolts, the lower end of the gusset plate protruding from the beam tip is placed on the beam receiving portion of the second flange ring. It is a feature.

Further, in the invention of claim 2 of this application, the first and second flange rings have a tubular portion, a large-diameter portion connected to the lower end of the tubular portion, and the tubular portions. And integrally provided so as to project from the large-diameter portion outward in the diameter direction,
It has a plurality of boss portions in which bolt holes are formed, and a plurality of rib-shaped projections formed from the upper surface of the large-diameter portion to the outer peripheral surface of the tubular portion, and the rib-shaped projections project from the tip of the beam. It is characterized in that the lower end of the gusset plate is placed.

[0008]

According to the present invention, the gusset plate is provided on the beam side so as to project from the tip of the beam, and the lower end of the gusset plate is placed on the beam receiving portion of the second flange ring. Therefore, the eccentric bending moment is not generated on the joint column, that is, the column side, and the column can be prevented from being deformed.

Further, according to the invention, the first and second flange rings are provided with a tubular portion, a large diameter portion continuously provided at a lower end of the tubular portion, and a plurality of bolt holes. It is configured to have a boss portion and a plurality of rib-shaped projections for mounting the lower end of the gusset plate, in other words, it is configured to eliminate other extra portions as much as possible. Therefore, the weight can be reduced.

[0010]

FIG. 1 is a perspective view for explaining a joint structure of a second flange ring (1) with columns (7), (15) and a beam (25) according to an embodiment of the present invention. 2 is an exploded perspective view around the joint structure of FIG. 1, and FIG. 3 is a cross-sectional view around the joint structure of FIG. 2 and 3, (2) is a concrete cloth foundation, and (3) is an anchor bolt embedded in the cloth foundation (2). This anchor bolt (3) has a base plate
Insert the insertion hole (5) of (4), screw the long nut (6) to the upper end of the anchor bolt (3) protruding from the insertion hole (5), and attach the base plate (4) to the cloth foundation (2). Fix it.

(7) is a hollow column made of steel pipe.
The outside of (7) is a bolt planted in the base plate (4).
Flange ring (1) fixed by (8) and nut (9)
It is integrated in 0). (14) is a through bolt inserted into the pillar (7), and the lower end of this through bolt (14) is a long nut.
It is screwed into (6).

(15) is a joint column (corresponding to the cylindrical boss of the conventional example) provided in the panel zone of the joint between the upper end of the column (7) and the beam (25), and (16) is the column ( 7) and two annular diaphragms having an outer diameter larger than the outer diameter of the joint column (15), and on both upper and lower surfaces thereof, slightly smaller than the inner diameters of the column (7) and the joint column (15). The protrusions (23) and (24) having an outer diameter are integrally formed. (17) are horizontal stiffener rings each formed in a substantially T shape.
The central part of the diaphragm (16) is fitted and fixed to the center of the (17), and the two are integrated.

(11) (1) is a hollow column (7) and a joint column (15)
First and second flange rings having an inner diameter slightly larger than the above, as shown in FIG. 2, these first and second flange rings (11) (1) and the stiffener ring (17) are Bolt holes (18) for tightening are formed corresponding to each other. Further, the second flange ring (1) is provided with a rib-shaped projection (13) as a beam receiving portion of the present invention for mounting a lower end of a gusset plate provided so as to project from a beam tip described later. Has been done.

Next, the assembling operation of such a structure will be described in the order of construction.

A first flange ring (11) is preliminarily fitted on the upper end of the pillar (7) which is inserted into the through bolt (14) and is erected as described above by press fitting or other means. The lower diaphragm (16) fixed to the stiffener ring (17) is attached to the upper side of the pillar (7) by inserting the protrusion (23). Further, the lower end of the joint column (15) is fitted onto the protrusion (24) on the upper surface of the diaphragm (16) to stack the joint column (15). At this time, the second flange ring (1) is previously integrally attached to the lower end of the joint column (15) by press-fitting or other means so that the rib-shaped projection (13) is on the upper surface side. There is. Thus, on the lower end side of the joint post (15), one first and second flange ring (11) is provided on each of the upper and lower sides of the stiffener ring (17) to which the lower diaphragm (16) is fixed. (1) is fitted onto the upper end of the hollow column (7) or the lower end of the joint column (15), and the first and second flange rings (11) (1) and the stiffener ring (17) are They are fixed to each other by the bolts (22) and nuts (37) inserted into the bolt holes (18).

Numerals (25) ... are three-direction beams made of H-shaped steel, and webs (26) in the vertical direction of these beams (25) ...
The vertical gusset plate (27) is welded and fixed, and this gusset plate (27) is placed and supported on the rib-like projections (13) formed on the second flange ring (1). Further, the lower flange (28) of the beam (25) is joined and fixed to the horizontal stiffener ring (17) to which the lower diaphragm (16) is fixed by bolts (29) (29).

Further, another second flange ring (1) is externally fitted on the upper end side of the joint column (15), and this joint column (15)
The protrusion (24) on the lower surface of the diaphragm (16) fixed to the upper stiffener ring (17) is inserted and attached to the upper part. Then, these diaphragms (16) and joint columns (1
5) Through the inside, the upper end of the through bolt (14) is projected, and the joint post (15) is fastened and fixed by the long nut (19) screwed to the upper end of the through bolt (14). . Also, beams (25)
The upper flange (28) of each bolt is bolted to a horizontal stiffener ring (17) to which the upper diaphragm (16) is secured.
(29) (29) ... are fixed by joining.

A lower end of a through bolt (21) is screwed into an upper half portion of the long nut (19), and the through bolt (21) is fitted with another first flange ring (11). The lower end of this pillar (20) is fitted onto the protrusion (23) on the upper surface of the upper diaphragm (16) so as to be inserted into the hollow pillar (20) for the second floor. Then, the upper stiffener ring (1
On both upper and lower sides of 7), the first and second flange rings (11) (1) and the stiffener ring (17) which are fitted onto the upper end of the joint column (15) and the lower end of the hollow column for the second floor (20) Similarly to the above, the bolts (22) and nuts (37) inserted into the bolt holes (18) are fixed.

At the upper end of the pillar (20), the first flange ring (11), diaphragm (16), and
The stiffener ring (17), the second flange ring (1), and the joint pillar (15) are piled up in this manner, and thus the first floor and the second floor
Floors, 3rd floor ... are formed.

FIG. 4 is an enlarged plan view of the second flange ring (1), and FIG. 5 is a sectional view taken along line AA of FIG. The second flange ring (1) includes a tubular portion (41) and the tubular portion.
A large-diameter portion (42) connected to the lower end of (41) has a substantially two-step shape, and is formed so as to project outward in a diameter direction from the cylindrical portion (41) and the large-diameter portion (42). Four boss parts (4
3) (43) ... are integrally formed, and each boss (43) (43) ...
A bolt hole (18) is formed so as to penetrate vertically. Furthermore,
A large diameter portion (42) is provided at each intermediate portion between these boss portions (43) (43).
Rib-shaped projections (13) (13) extending from the upper surface to the outer peripheral surface of the tubular portion (41) such that the upper surface is flush with the upper surface of the tubular portion (41).
Are formed integrally with each other with a space therebetween. That is, the second
The flange ring (1) has a bolt hole (18)
Bosses (43) (43) ... and gusset plate (27)
The rib-shaped projections (13) (13) on which the slabs are placed are scraped off to form only the necessary portions, and the weight is reduced.

The rib-shaped protrusions (13) are arranged two by two regardless of which side of the web (26) of the beam (25) the gusset plate (27) to be placed is attached to. Because you can.

The first flange ring (11) is constructed by inverting the second flange ring (1) upside down. The difference lies in the first flange ring (11) as shown in FIG.
The flange ring (11) has an inclined portion (30) formed by obliquely cutting off the lower end corner of the inner peripheral surface.

On the upper and lower side surfaces of the diaphragm (16),
An annular groove (34) is formed along the root of the protrusion (23), and between the groove (34) and the inclined portion (30) on the upper side of the first flange ring (11). , Steel balls (35) are provided as a plurality of fasteners. Then, the first flange ring (11), the stiffener ring (17) and the second flange ring (1) are inserted into the respective bolt holes (18) from below with the bolts (22) penetrating. The bolt (2
2) The nuts (37) are screwed into the tips so that they are fastened together. At this time, due to this tightening force, the first
At the same time that the flange ring (11) is pulled upward, the steel ball (35) is moved to the pillar (7) by the action of the inclined portion (30).
It is strongly pressed to the outer peripheral surface side of the diaphragm, whereby the diaphragm (16), the pillar (7), the first flange ring (11), etc. are integrally connected.

On the other hand, on the upper end side of the joint pillar (15),
The diaphragm (16) is attached to the upper end of the joint pillar (15) as described above.
Fitted upside down as shown, and with the same structure as above, the diaphragm (16), column (20), and first flange ring (11)
Etc. are connected together.

Furthermore, a pillar is provided on the upper surface of the base plate (4).
(7) A plurality of steel balls (35) are also formed between the annular groove (40) formed along the outer circumference and the curved portion formed by being depressed on the inner peripheral surface on the lower end side of the flange ring (10). Provided with the base plate
(4), pillar (7), flange ring (10), etc. are integrally connected. The steel balls (35) are not always necessary.

[0026]

As described above, according to the present invention, the gusset plate is provided so as to project from the tip of the beam, and the gusset plate is placed and supported by the rib-like projection provided on the second flange ring. . As a result, an eccentric bending moment does not occur on the joint column, that is, the column side, deformation of the column can be prevented, and stress applied to the column can be smoothly transmitted to the column.

Further, according to the present invention, since the gusset plate is not attached by welding to the joint column side, it is not necessary to prepare different kinds of joint columns depending on the number and positions of the beams connected to the joint columns.

Further, the flange ring is not formed so as to have a constant thickness, but the outer peripheral surface of the flange ring except for the boss portion in which the bolt hole is formed and the rib-shaped projection for mounting the gusset plate are removed. Since it can be scraped off and composed of only the necessary parts, there is no excess meat,
It is possible to reduce the weight of the flange ring and reduce the material cost.

[Brief description of drawings]

FIG. 1 is a second flange ring (1) according to an embodiment of the present invention.
FIG. 9 is a perspective view for explaining the joint structure of the pillars (7), (15) and the beams (25).

FIG. 2 is an exploded perspective view around the joint structure of FIG.

FIG. 3 is a cross-sectional view around the joint structure of FIG.

FIG. 4 is an enlarged plan view of a second flange ring (1).

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 The second flange ring (1) is a gusset plate
It is an enlarged sectional view showing a state where (27) is mounted.

[Explanation of symbols]

(1) Second flange ring (7) Hollow pillar (11) First flange ring (13) Rib-shaped protrusion (14) Through bolt (15) Joint pillar (16) Diaphragm (17) Stiffener ring (25) Beam (27) Gusset plate

Claims (2)

(57) [Claims] 1. A diaphragm provided with a stiffener ring for joining a beam lower end on an outer periphery is provided between the upper end of the column and a joint column attached to the panel zone of the upper end of the column, and below the stiffener ring. At a column-beam joint where the first flange ring fitted on the upper end of the column, the second flange ring fitted on the lower end of the joint column on the upper side, and the stiffener ring or diaphragm are fastened together by bolts. A column-beam joint structure characterized in that the lower end of the gusset plate protruding from the tip of the beam is placed on the beam receiving portion of the second flange ring. 2. The first and second flange rings are
A cylindrical portion, a large-diameter portion that is connected to the lower end of the cylindrical portion, and a plurality of cylindrical portions and a plurality of bolt holes that are integrally provided so as to project outward in the diameter direction from the large-diameter portion. A boss portion and a plurality of rib-shaped projections formed from the upper surface of the large-diameter portion over the outer peripheral surface of the tubular portion, the rib-shaped projections, the lower end of the gusset plate protruding from the beam tip, The column-beam joint structure according to claim 1, wherein the column-beam joint structure is mounted.