JP2560907B2 - Joining method of square tubular steel column and steel beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a square tubular steel column (hereinafter simply referred to as "tubular steel column").
There is a case. ) And a steel frame beam such as an H-shaped steel beam.

[Problems to be Solved by Prior Art and Invention]

Conventionally, when joining a steel frame beam such as an H-shaped steel beam to a tubular steel column with a joining bolt, a hand cannot be put inside the tubular steel column, so a screw hole in which the joining bolt is screwed into the tubular steel column in advance. The metal fitting with a screw hole having is inserted and the joining bolt is screwed into the screw hole of the metal fitting with a screw hole.

However, in order to securely tighten the joint bolt by screwing the joint bolt into the screw hole of the metal fitting with the screw hole inserted in the tubular steel column, the metal fitting with the screw hole must be attached to the inner surface of the tubular steel column. Must be in close contact with.

Conventionally, there has been a problem that it is not easy to insert the threaded metal fitting into the tubular steel column while closely contacting the inner surface of the tubular steel column.

The present invention has been made to solve the above problems, and a metal fitting with a screw hole can be inserted into a square tubular steel frame pillar in a state of being in close contact with the inner side surface of the steel frame pillar, and a joining bolt can be securely attached. An object of the present invention is to provide a method of joining a square tubular steel frame column and a steel beam that are fastened to each other.

[Means for solving the problem]

A method of joining a square tubular steel column and a steel beam according to the present invention is (A) a flat plate portion having a plurality of screw holes, and a projecting portion projecting from the flat plate portion so as to form a T-shape in section. A vertical piece having and a side surface protruding from the lower end of the vertical piece in an L shape,
Four L-shaped metal fittings each having a lateral piece having a fitting groove into which the protrusion can be fitted to the bottom of the L-shape are closed by sequentially fitting the projection and the fitting groove. The step of inserting the square assembly metal fitting assembled in to a predetermined position in the square tubular steel column,
(B) Each of the L-shaped metal fittings constituting the quadrangle assembly fitting is screwed into the screw hole of the flat plate portion from the surface of the quadrangular tubular steel pillar through a bolt hole formed in the side surface of the quadrangular tubular steel pillar to form the square tubular steel frame. The steps of pulling to the pillar side to temporarily fix the flat plate part of each L-shaped metal fitting to the inner surface of the square tubular steel frame pillar, and the fitting groove and protrusion of each L-shaped metal fitting constituting the square assembly metal fitting by the steps (C) and (B). A step of electroslag welding through a welding hole formed in the side surface of the square tubular steel column through a gap formed between the split tee and the split tee attached to the end of the steel beam after removing the temporary fixing bolt. Is connected to the flat plate portion of the L-shaped metal fitting by a high-strength bolt.

A first gist of the present invention is that a metal fitting with a screw hole arranged in a square tubular steel frame column can be easily inserted into the steel frame column, and
The second point is that the assembly metal fittings are configured so that they can be closely attached to the inner surface of the steel column. The point is that the assembled metal fittings are firmly integrated by electro-slag welding the respective L-shaped metal fittings.

 The first point will be described.

First, four L-shaped metal fittings having the same shape and size are prepared. This L-shaped metal fitting has a vertical piece having a flat plate portion having a plurality of screw holes, a projection portion protruding from the flat plate portion so as to form a T-shaped cross section, and a side surface at the lower end of the vertical piece. It is projected in L shape,
The L-shaped bottom portion has a lateral piece having a fitting groove into which the protrusion can be fitted. The protrusion groove of the vertical piece of the first L-shaped metal fitting is fitted into the fitting groove of the horizontal piece of the second L-shaped metal fitting to be connected. Similarly, the projection groove of the vertical piece of the second L-shaped metal fitting is fitted into the fitting groove of the horizontal piece of the third L-shaped metal fitting to be connected. Finally, while fitting and connecting the fitting groove of the horizontal piece of the fourth L-shaped fitting to the projection of the vertical piece of the third L-shaped fitting, the projection of the vertical piece of the fourth L-shaped fitting is connected. The portion is fitted into the fitting groove of the lateral piece of the first L-shaped metal fitting to connect the four L-shaped metal fittings of the same shape and the same size in a closed manner. As a result, there is almost no space in the fitting portion, and the square assembly fitting is assembled except for the chamfers at the four corners. The outer diameter of this square assembly metal fitting is designed to be slightly smaller than the inner diameter of the square tubular steel column, and its shape is similar to the cross-sectional shape of the steel column, so insertion work into the steel column can be performed smoothly. Be seen. On the side surface of the square tubular steel column, a bolt hole is pre-drilled at a position opposite to the screw hole of the flat plate portion of the L-shaped metal fitting constituting the inserted assembly metal fitting, and the square tubular steel column surface is temporarily fixed through the bolt hole. Screw the bolt into the screw hole on the flat plate. As the screwing progresses, each L-shaped metal fitting is pulled toward the steel column, and the flat plate portion is brought into close contact with the inner surface of the steel column. Voids will be formed in the grooves.

The second point is to fill the voids formed by the above-mentioned operation with the weld metal by electroslag welding and to weld each L-shaped metal fitting constituting the assembly metal fitting and to weld the end of the assembly metal fitting to the steel column. As a result of this electroslag welding, the assembly metal fittings will not be displaced from the predetermined positions even if the temporary fixing bolts are removed.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an L-shaped metal fitting as a metal fitting with a screw hole used in this embodiment. The L-shaped metal fitting 1 is composed of two orthogonal pieces, and the vertical piece 1a is a flat plate portion 2 and this flat plate portion. 2 and a ridge portion 3 protruding so as to form a T-shaped cross section, the horizontal piece 1b is provided at a right angle to the lower end of the vertical piece 1a, and the ridge portion 3 is provided at the bottom of the horizontal piece. A fitting groove 4 having a size for fitting is formed. Further, four screw holes 5 are formed on both sides of the flat plate portion 2.

Prepare four L-shaped metal fittings 1 formed in this way, and
The fitting groove 4 of the second L-shaped metal fitting 1 is provided on the ridge portion 3 of the L-shaped metal fitting 1.
Fit and connect. Similarly, the projection groove 3 of the second L-shaped metal fitting 1 is fitted into the fitting groove 4 of the third L-shaped metal fitting 1 to be connected.
In the last fourth L-shaped metal fitting 1, the fitting groove 4 is fitted to the projection 3 of the third L-shaped fitting 1, and the projection 3 is fitted to the fitting groove 4 of the first L-shaped fitting. To do. By this operation, a substantially square assembly fitting 6 in which the four L-shaped fittings 1 are connected in a closed shape is assembled.

The mounting of the assembly fitting 6 to the square tubular steel column 7 and the electroslag welding described below are performed by the square tubular steel column 7.
Place it horizontally and rotate it by 90 ° if necessary.

The assembly metal fitting 6 is inserted into the square tubular steel frame pillar 7 as shown in FIG. Since the outer dimension of the assembly member 6 is slightly smaller than the inner dimension of the steel column 7, the assembly member 6 can be easily inserted from one end of the square tubular steel column 7.

As shown in FIG. 3, bolt holes 8 are drilled on the four circumferential side surfaces at the predetermined positions (the same as the positions facing the screw holes 5 of the flat plate portion 2) where the steel beam of the square tubular steel column 7 is joined. ,
A temporary fixing bolt 9 for temporarily fixing the assembly metal fitting 6 in the square tubular steel frame pillar 7 is inserted into the bolt hole 8 and screwed into the screw hole 5 of the flat plate portion 2 to mount the assembly metal fitting 6 in the square tubular steel frame pillar 7. The L-shaped metal fittings 1 of the assembly metal fitting 6 are pulled to the side of the square tubular steel frame pillar 7 by further tightening the temporary fixing bolts 9, and the flat plate portion 2 of each L-shaped metal fitting 1 is square-shaped tubular steel frame pillar. It adheres to the inner surface of 7. In this process, a gap 10 is formed between the bottom of the fitting groove 4 and the protrusion 3.

The temporary fixing bolts 9 do not need to be screwed into all the screw holes 5, and may be screwed in the number necessary for temporary fixing and smooth drawing of each L-shaped metal fitting 1. Usually, as shown in FIG. 3, it is screwed into half of the screw holes 5 with good balance.

A welding hole 11 is drilled on the side surface of the square tubular steel column 7 at a position facing the space 10, and as shown in FIG.
Electroslag welding is performed through this welding hole 11 to fill the gap 10 with the deposited metal 12. The electroslag welding is performed by rotating the square tubular steel column 7 by 90 ° for all four voids 10. By filling the weld metal 12 by the electroslag welding, the L-shaped metal fittings 1 are fixed to each other and also to the square tubular steel frame pillar 7.

In addition, FIG. 4 shows the time when the electroslag welding for one void 10 is completed, and the square tubular steel frame column 7 is rotated 90 ° to perform the electroslag welding for the second void 10. is there.

In this way, the steel beam 13 made of H-shaped steel is joined to the four side surfaces of the square tubular steel column 7 having the assembly fitting 6 attached to the inner surface. A split tee 14 is previously fixed to the end of the steel beam 13. For joining, after removing the temporary fixing bolt 9,
The high strength bolt 15 is passed from the bolt hole of the split stay 14 fixed to the end of 13 to the bolt hole 8 of the square tubular steel column 7 and is strongly screwed into the screw hole 5 of the flat plate portion 2.
The high-strength bolt 15 is screwed into all the screw holes 5. The square tubular steel frame pillar 7 has two sets of upper and lower assembly fittings 6,
6 and attach the steel beam 13 to the position facing the assembly brackets 6, 6.
The upper and lower flanges of the above are bolted to each other by the eight high-strength bolts 15 via the split stays 14.

If necessary, concrete can be filled in the square tubular steel frame pillar 7.

〔The invention's effect〕

The method for joining a square tubular steel frame column and a steel frame beam according to the present invention has the configuration described above, and particularly, each L of the assembly metal fitting.
Tighten the bracket to the side of the square tubular steel column by tightening the temporary fixing bolt to bring the flat plate part into close contact with the inner surface of the square tubular steel column, and fix each L-shaped bracket to the inner surface of the square tubular steel column by electroslag welding. After that, the high-strength bolt is screwed into the screw hole of the flat plate part of each L-shaped fitting through the bolt hole of the split stay, so that the high-strength bolt can be securely tightened and the steel beam to the side surface of the square tubular steel column. There is an effect that can be reliably joined.

Further, since the assembly fitting is fixed to the inside of the square tubular steel column prior to the site loading, the workability of the steel beam joining on the site can be remarkably enhanced.

[Brief description of drawings]

FIG. 1 is a perspective view of an L-shaped metal fitting, and FIGS. 2 (a) and 2 (b) are cross-sectional views and AA of a square tubular steel column in which an assembly metal fitting is inserted.
Sectional views, FIGS. 3 (a) and 3 (b), show each of the L-shaped metal fittings of the assembly metal fittings in a state in which the flat plate portion is brought into close contact with the inner surface of the square tubular steel frame pillar by pulling the L-shaped metal fittings toward the square tubular steel frame pillar side. Sectional drawing and BB sectional view, FIG. 4 is a sectional view of a square tubular steel frame column at the time of electroslag welding, and FIGS. 5 (a) and 5 (b) are sectional views of a rectangular tubular steel frame column joined with a steel beam and It is CC sectional drawing. 1 ... L-shaped metal fittings, 1a ... vertical piece of L-shaped metal fittings, 1b ... horizontal piece of L-shaped metal fittings, 2 ... flat plate part, 3 ... projection part, 4 ... fitting groove, 5 ... Screw hole, 6 ... Assembly metal fitting, 7 ... Square tubular steel column, 8 ... Bolt hole, 9 ... Temporary fixing bolt, 10 ... Void, 11 ... Weld hole, 12 ... Weld metal, 13 ... Steel beam, 14 ……
Split Tee, 15 …… High-strength bolt.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Tomita 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Kansuke Honma 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (1)

(57) [Claims] 1. A vertical piece having a flat plate portion having a plurality of screw holes, a projecting portion projecting from the flat plate portion so as to form a T-shaped cross section, and a lower end of the vertical piece. The four side surfaces of the L-shaped metal fitting are provided with an L-shaped side surface, and a lateral piece having a fitting groove on the bottom of the L-shaped shape to which the protrusion can be fitted. Inserting a rectangular assembly metal fitting, which is assembled into a closed shape by sequentially fitting the grooves, into a predetermined position in the square tubular steel column, (B) a square tubular shape through a bolt hole formed in the side surface of the square tubular steel column Each L that composes a square assembly bracket by screwing a temporary fixing bolt from the surface of the steel column to the screw hole of the flat plate
(C) a step of pulling the brackets toward the square tubular steel column side and temporarily fixing the flat plate portion of each L-shaped bracket to the inner surface of the square tubular steel column
By the process of (B), electroslag welding is performed through a welding hole formed in the side surface of the square tubular steel column through a gap formed between the fitting groove of each L-shaped metal fitting forming the rectangular assembly metal fitting and the protruding portion. Step (D), after removing the temporary fixing bolt, connecting the split tee attached to the end of the steel beam to the flat plate portion of the L-shaped metal fitting with a high-strength bolt, which is a joining method of a square tubular steel column and a steel beam .