JPH0692673B2 - Joint structure of closed-section column and beam main bar - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a joint structure of a column composed of a closed cross-section material such as a circular steel pipe or a rectangular steel pipe and a main beam of a PC beam, a reinforced concrete beam or a steel reinforced concrete beam. Is.

[Conventional technology]

Generally, closed type cross-section materials such as circular steel pipes and square steel pipes do not have directionality such as weak axis and strong axis when used, so they are widely used as columns for steel concrete and steel reinforced concrete structures as well as for steel structure buildings. There is.

However, when a closed cross-section material such as a square steel pipe is used as a pillar, the anchoring of the main bar end of the beam becomes an important point.

Conventionally, the fixing of the end portion of the main reinforcement in such a case is performed by bending the end portion of the main reinforcement along the column and bending it upward or downward, or by welding to the column.

[Problems to be Solved by the Invention]

However, in such a fixing method, in the former fixing method, it is necessary to bend the end portion of the main bar in advance, so that the processing becomes difficult when the diameter becomes large. In addition, it is unavoidable that the amount of rebar used increases considerably in order to secure a sufficient fixing length of the main bar.

On the other hand, in the latter fixing method, the welding precision is greatly affected by the skill of the welder and the weather, and sometimes a defect in strength may occur.

In addition, since the wall thickness of the column is not so thick, it is not possible to sufficiently secure the rigidity of the beam joint portion of the column by simply welding the ends of the main bars to the column.

The present invention has been proposed in order to solve the above-mentioned conventional problems, and the end portion of the beam main bar can be reliably fixed, and the stress of the beam main bar can be surely transmitted to the column. It is an object of the present invention to provide a joint structure of a closed cross-section column and a reinforced concrete column or a steel-framed reinforced concrete beam, which can omit the bending process of the end portion of the main bar and can largely save the reinforcing bar.

[Means for solving the problem]

The present invention relates to a joint structure of a column composed of a closed cross-section material such as a rectangular steel pipe and a beam main bar of a reinforced concrete beam or a steel-framed reinforced concrete beam. Then, the beam main reinforcing bar joint nut is fixed to the beam main bar connecting metal, the beam main bar connecting nut is screwed through the through hole from the outside of the column, and the beam main bar and the joint bolt are connected by the coupler. At the same time, the above-mentioned object is achieved by adopting a structure in which male screws at both ends of the tie bolt are screwed and fixed to the beam main bar joint nuts fixed to the joint metal fittings on the surfaces of the columns facing each other.

〔Example〕

 The present invention will be described below with reference to an embodiment shown in the drawings.

In FIGS. 1, 2, and 3, reference numeral 1 is a column made of a rectangular steel pipe, 2 is a beam made of reinforced concrete, 3 is a beam-joining metal fitting, and 4 is a main bar of the beam 2.

The beam joining metal member 3 is formed in a laterally long plate shape, and both left and right ends thereof are bent by a predetermined length in an L shape for the purpose of increasing the rigidity of the whole.

Further, the height and the thickness of the beam joint metal 3 are determined according to the sectional size of the beam 2 to be joined.

A plurality of screw holes 5 are formed laterally in the beam joint metal 3 with a predetermined interval, and the diameter and position of the screw holes 5 are determined by the diameter and position of the main bar 4 of the beam 2.

The beam joining hardware 3, 3 formed in this way is the through hole 12 of the pillar 1.
And the pillar 1 to the inside of the pillar 1
It is temporarily fixed from the outside by a mounting screw or blind bed 10.

In this case, the positions of the beam joining hardware 3, 3 are determined by the positions of the upper end main bars 4, 4 and the lower end main bars 4, 4 of the beam 2.

Inside the beam joint metal 3, a plurality of beam main bar joint nuts 6 are attached and fixed.

The beam main bar connecting nut 6 is formed by forming a male screw portion 6a at one end of a long nut.
Is fixed to the inside of the beam-joining metal fitting 3 by being screwed into the screw hole 5.

The beam joint hardware 3, 3 is connected by tie bolts 7, 7. Both ends of the tie bolts 7, 7 are connected and fixed to the beam joint metal parts 3, 3 by being screwed into the beam main bar joint nuts 6, 6.
As a result, the main bars 4 and 4 of the beams 2 and 2 are connected by the tie bolts 7 and 7, so that the stress transmission between the column 1 and the beams 2 and 2 and the stress transmission between the left and right beams 2 and 2 are smoothly performed. It can be done.

Further, joint bolts 8 are provided on the side surface of the beam joint of the pillar 1 so as to project therefrom.

The joint bolt 8 is attached by screwing the base end portion of the joint bolt 8 into the beam main joint nut 6 through the through hole of the column 1.
The main bar 4 of the beam 2 is joined to the tip of the joint bolts 8 by a screw type coupler 9.

FIG. 5 shows that both ends of the tie bolts 7,7 are penetrated through the beam main joint nuts 6,6 to project outward from the side of the column 1, and the projecting portions 7a, 7a are used as joints of the main bar 4, and the beam The two main bars 4, 4 are joined by a screw type car puller 9. With such a configuration, the joint bolts 8 and 8 can be saved.

In addition, the beam joint metal 3,3 beam main bar joint nut 6,6 and tie bolt
7,7 shall be installed in advance at the factory.

6 and 7 show a second embodiment of the present invention, in which the beam-joining metal member 3 is formed in a rectangular ring shape which is slightly smaller than the diameter of the column 1 and the beam main-bar joints are formed inside each side surface portion. The nut 6 is attached.

If the beam-bonding metal 3 is formed in this way, one beam-bonding metal 3 is sufficient when the beam 2 is bonded in two or four directions.
As a result, the number of metal parts is reduced and the work becomes easier. However, the rigidity of the beam joint is further enhanced.

In addition, the thickness and height of the beam joint metal 3 can be appropriately changed according to the cross-sectional size of the beam 2 to be jointed, and the position of the beam joint metal 3,3 is the same as that of the main bars 4,4 of the beam 2. The points that can be changed accordingly are substantially the same as in the first embodiment.

Also, the beam-joining metal 3 need not be limited to a rectangular shape,
It may be circular or polygonal depending on the cross-sectional shape of the pillar 1.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

The end of the beam main bar is fixed by screwing it into the beam main bar connecting nut of the beam connecting metal provided inside the beam connecting part of the column via a joint bolt, etc. It can be reliably fixed.

Further, since it is not necessary to bend the end of the main bar for the purpose of securing the fixing length, not only is it unnecessary to save time, but also the amount of rebar can be saved because the fixing length of the end of the main bar is unnecessary. .

Further, the end of the main beam of the beam is fixed to the column by being screwed into the nut of the main beam connecting nut of the beam connecting metal installed inside the beam connecting part of the column via the joint bolt, etc. Since the columns and the beams and the beams are connected to each other by tie bolts via the etc., there is continuity in transmitting stress, and therefore, there is no structural waste and extremely rational design is possible.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a vertical sectional view of a column / beam joint, FIG. 2 is a transverse sectional view thereof, and FIG. 3 is a beam joint metal fitting. FIG. 4, FIG. 4 is an enlarged view of part A in FIG. 1, FIG. 5 is a cross-sectional view of a column-beam joint,
6 and 7 show a second embodiment of the present invention. FIG. 6 is a longitudinal sectional view of a column-beam joint, FIG. 7 is a perspective view thereof, and FIG. 8 is a steel-framed reinforced concrete column. FIG. 9 is a cross-sectional view of the beam joint portion, and FIG. 9 is a cross-sectional view of the beam joint portion of the steel concrete column. DESCRIPTION OF SYMBOLS 1 ... Pillar, 2 ... Beam, 3 ... Beam joining metal object, 4 ... Main bar, 5 ... Screw hole, 6 ... Beam main bar joining nut, 7 ... Tie bolt, 8 ... Joint bolt, 9 ... Screw type coupler, 10 ... Mounting screw or Blind rivets, 11,12 ... Beam joint hardware mounting holes.

Claims (1)

[Claims] Claim: What is claimed is: 1. A connection member for a beam main bar is fixed to the inside of a beam connection portion of a closed cross-section column, a beam main bar connection nut is fixed to the connection member for the beam main bar, and the beam main bar connection nut is outside the column. Tighten the joint bolt through the through hole, join the beam main bar and the joint bolt with the coupler, and attach the beam main bar connecting nuts fixed to the joint metal fittings on the inner surfaces of the columns to each other at the both ends of the tie bolt. A joint structure between a column having a closed cross-section and a beam main bar, characterized in that a male screw is fixed by screwing.