JPH0768724B2 - Connection structure and connection method for square steel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure of rectangular steel members for connecting rectangular steel members in an axial direction and a connecting method for realizing the structure.

[0002]

2. Description of the Related Art Conventionally, as a structure for connecting square steel materials in an axial direction, the end surfaces of the square steel materials to be connected are brought into contact with each other and the contact portions are welded, and the end portions of the square steel materials to be connected are connected. There is known one in which a connecting member is brought into contact with an inner surface or an outer surface of a side wall, a bolt is passed through the side wall and the connecting member of a square steel material, and is screwed by a nut (for example, Japanese Patent Laid-Open No. 2-27).
No. 256738, No. 2-23611, etc.).

[0003]

In the former one of those described in the prior art, the welding is complicated and time-consuming because each square steel material is simultaneously supported and welded, and the connection strength depends on the welding state. However, there was a problem that it was not stable. On the other hand, in the latter, there is a problem that it takes time to connect with a large number of bolts and nuts, and that the bolts or nuts project to the outside of the square steel material in the connected state and the appearance is impaired. .

The present invention has been made in view of the above problems, and an object of the present invention is to facilitate connection work, shorten the work time, and provide sufficient connection strength. An object of the present invention is to provide a connecting structure of square steel materials that does not impair the appearance and a connecting method for realizing the structure and polishing.

[0005]

In order to achieve the above object, the invention according to claim 1 has a nut insertion hole formed in an end side wall and a male screw part insertion hole formed in the end wall. A square steel material with a fitting groove formed at the end, a connecting member with male threads protruding from both sides of the flat plate, and a nut having a female thread formed on the inner diameter and a wire insertion groove formed on the outer diameter Then, the male screw portion of the connecting member is inserted into the male screw portion insertion hole of the rectangular steel member to fit the flat plate portion into the fitting groove, and the female screw portion of the nut is screwed into the male screw portion of the connecting member. And the square steel materials are connected through a connecting member.

The invention according to claim 2 is a method for realizing this connecting structure, wherein a nut insertion hole is formed in the end side wall and a male screw part insertion hole is formed in the end wall. A square steel material with a fitting groove formed at the end is provided, a connecting member having a male screw portion is provided on both sides of the flat plate portion, and a female screw portion is formed on the inner diameter.
A nut having a wire insertion groove formed on the outer diameter is provided, the male screw portion of the connecting member is inserted into the male screw portion insertion hole of the square steel member, and the flat plate portion is fitted into the fitting groove. Insert the nut into the square steel through the insertion hole, rotate the nut inside the square steel and screw it onto the male thread of the connecting member to connect the connecting member to the end of the rectangular steel, This connecting member is connected to the end portion of another rectangular steel material to connect the rectangular steel materials.

[0007]

The male screw portion of the connecting member is inserted into the male screw portion insertion hole of the end wall of the square steel member, and the flat plate portion of the connecting member is fitted in the fitting groove of the square steel member.

The nut is inserted into the inside of the square steel through a nut insertion hole formed in the side wall of the end of the square steel, and the nut is rotated to screw the nut into the male screw portion of the connecting member. To the end of.

Next, when this connecting member is similarly connected to the end portion of another rectangular steel material, the rectangular steel material is connected through the connecting member.

[0010]

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

As shown in FIGS. 1 and 2, the connecting structure of the rectangular steel material of the present invention connects the rectangular steel material 1 with a connecting member 2 and a nut 3.

The square steel material 1 has a side wall 4 as shown in FIG.
And a wall 5 having an end wall 5 and a rectangular cross section. A nut insertion hole 6 is formed in the end portion of the side wall 4, and a male screw portion insertion hole 7 is formed in the end wall 5. Also, the end wall 5
The outer surface 5a is located inward of the end surface 4a of the side wall 4 by a predetermined distance, that is, the fitting groove 8 having a predetermined depth is formed at the end of the rectangular steel material 1.

As shown in FIG. 1, the connecting member 2 is formed by projecting male screw portions 10 and 11 on both sides of a flat plate portion 9.
Here, the flat plate portion 9 is fitted in the fitting groove 8 of the rectangular steel material 1 so as to fit on each side, and the thickness thereof is twice the depth of the fitting groove 8.

As shown in FIG. 1, the nut 3 is annular and has an internal thread portion 12 formed on the inner diameter and a wire guide groove 13 formed on the outer diameter.

In connecting the square steel materials 1, a nut fastening tool 14 as shown in FIGS. 3 to 6 is used.

The nut fastening tool 14 is a wire 1 made of metal.
5 and the wire guide tube 16, the wire 15 is curved to form an annular portion 15a at the tip portion, and parallel portions 15b and 15c are provided following the tip portion.
5c is inserted into the wire guide tube 16 and is slidable in the axial direction of the wire guide tube 16.

The rear end of the wire 15 is connected to the shaft of a wire driving motor (not shown), and the parallel portions 15b and 15c are moved in different directions by the operation of the wire driving motor. , And moves in the direction A in FIG.

Next, the method of connecting the square steel materials of the present invention will be described.

First, as shown in FIG. 3, the male screw portion 10 of the connecting member 2 is inserted into the male screw portion insertion hole 7 of the end wall 5 of the square steel material 1 to form the flat plate portion 9 on the outer surface 5a of the end wall 5. The lower surface 9a is brought into contact, and the flat plate portion 9 is fitted into the fitting groove 8.

On the other hand, the guide tube 16 of the nut fastening tool 14 is moved rearward, the inner diameter of the annular portion 15a of the wire guide tube 15 is expanded, and the annular portion 1 is inserted into the wire guide groove 13 of the nut 3.
After inserting 5a, the wire guide tube 16 is moved forward and the nut 3 is held by the annular portion 15a as shown in FIG.

Then, as shown in FIG. 4, the nut 3 held in the annular portion 15a of the wire 15 is inserted into the square steel material 1 through the nut insertion hole 6 of the square steel material 1.

Next, as shown in FIG. 5, the annular portion 15a of the wire 15 is rotated by 90 °, and the annular portion 15a is moved upward so that the female screw portion 12 of the nut 3 is connected to the male screw portion of the connecting member 2. Match 10

When the wire driving motor is operated to move the wire 15, the annular portion 15a of the wire 15 is moved.
Rotates the nut 3, and as shown in FIG. 6, the nut 3 is automatically tightened and the connecting member 2 is joined to the end of the square steel material 1.

Similarly, a connecting member 2 is attached to the end of another rectangular steel material 1.
2 is connected, the rectangular steel materials 1 are connected via the connecting member 2 as shown in FIG.

[0025]

According to the connecting structure of square steel materials of the present invention, since the square steel materials are connected by one connecting member having the male screw portions projecting on both sides of the flat plate portion, the connecting work is easy.
Working time is also reduced.

Further, since the fitting groove is formed at the end of the square steel material and the flat plate portion of the connecting member is fitted into this fitting groove, sufficient strength is ensured against external force in the direction perpendicular to the axial direction. Get
The connection strength is practically sufficient.

Further, since the connecting member and the nut are located inside the rectangular steel material, there is nothing protruding outside the rectangular steel material in the connected state, and the appearance is not spoiled.

Further, according to the method for connecting square steel materials of the present invention, the above-described connection structure can be realized easily and in a short time. In the case of automatically tightening the nut by the wire driving motor, the work labor is further reduced and the work time is also shortened.

[0029]

[Brief description of drawings]

FIG. 1 is a perspective view showing a state before connection of a square steel material connection structure of the present invention.

FIG. 2 is a perspective view showing a state after the same and connection.

FIG. 3 is an explanatory view of a method of connecting square steel materials, and is a front view showing a state before a nut is inserted inside the square steel materials.

FIG. 4 is a front view showing a state after the nut is inserted into the same square steel material.

FIG. 5 is a front view showing a state where the nut is rotated by 90 °.

FIG. 6 is a front view showing a state in which a nut is screwed onto a male screw portion of the same connecting member.

[Explanation of symbols]

 1 Rectangular Steel Material 2 Connecting Member 3 Nut 4 Sidewall 5 End Wall 6 Nut Insertion Hole 7 Male Screw Part Insertion Hole 8 Fitting Groove 9 Flat Plate Part 10 Male Screw Part 11 Male Screw Part 12 Female Screw Part

Claims (2)

[Claims] 1. A rectangular steel member having a nut insertion hole formed in an end side wall thereof, a male screw insertion hole formed in the end wall thereof, and a fitting groove formed at an end thereof, and a male screw formed on both sides of a flat plate portion. A connecting member having a protruding portion, and a nut having a female threaded portion formed on the inner diameter and a wire insertion groove formed on the outer diameter.The male threaded portion of the coupling member is inserted into the male threaded portion insertion hole of the square steel material. A rectangular steel connection structure in which the flat plate portion is inserted into the fitting groove, the female screw portion of the nut is screwed into the male screw portion of the connecting member, and the square steel members are connected via the connecting member. . 2. A nut insertion hole is bored in the end side wall, a male screw part insertion hole is bored in the end wall, and a square steel member having a fitting groove is formed in the end part. A connecting member having a threaded portion is provided, a female screw portion is formed on the inner diameter, and a nut having a wire insertion groove is formed on the outer diameter.The male screw portion insertion hole of the square steel material is provided with the male screw portion of the connecting member. The flat plate portion into the fitting groove by inserting the nut into the square steel material through the nut insertion hole of the square steel material, and rotating the nut inside the square steel material to rotate the male screw of the connecting member. A method for connecting a rectangular steel material, comprising connecting a connecting member to an end portion of a rectangular steel material by screwing to a portion, and similarly connecting the connecting member to an end portion of another rectangular steel material to connect the rectangular steel material.