JPH0626098A - Joint structure of square steel tube column - Google Patents

Abstract

PURPOSE:To provide a joint structure which enables weldless joining. CONSTITUTION:Four joint plates 3 partially projected from a lower column 2 upward are joined to four sides of the inside of the upper end of the lower column 2 by bolts 4. Nuts 7 are fixed to the inside surfaces of the parts of the joint plates 3 that are projected from the lower column 2. The lower end of the upper column 1 is put on the outsides of four joint plates 3, and a bolt 12 is passed through a bolt insert hole 11 to be screw-fitted to the nut 7 of the joint plate 3.

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 square steel pipe columns in a steel frame structure having a rigid frame structure.

[0002]

2. Description of the Related Art Conventionally, a structure shown in FIG. 5 has been generally adopted as a joint for a rectangular steel pipe column in a rigid frame structure. That is, the plates 53 and 54 are provided on the four side surfaces of the upper and lower columns 51 and 52, and the upper and lower plates 53 and 54 are sandwiched by the two plates 55 and 55 and fixed by the bolts 56. After this, the abutting portions 57 of the upper and lower columns 51, 52 are welded on site, and after the welding is completed, the plate 5 in the four directions is
Cut 3,54. The four-direction plates 53, 5
4 is welded to the columns 51 and 52 at the factory in advance. The position to be joined by this joint structure 50 is usually 1 m from the floor level in order to facilitate the work of on-site welding.
It is considered as high.

[0003]

However, the conventional joint structure described above has the problems that the on-site welding is required, so that the construction time becomes long and the joint quality is difficult to control. Moreover, advanced welding technicians are required. Further, for the convenience of field welding, the joining position of the upper and lower columns 51, 52 is limited to a height of about 1 m from the floor level as described above.

An object of the present invention is to provide a joint structure for square steel pipe columns that can be joined without welding.

[0005]

The joint structure of the present invention comprises:
It is a structure in which a lower pillar and an upper pillar made of a rectangular steel pipe are bolted to each other, and four joint plates partially projecting upward from the lower pillar are respectively provided on the inner four side surfaces at the upper end of the lower pillar. Bolt them together. To these joint plates, a nut that is aligned with the bolt insertion hole formed in the joint plate is fixed to the inner surface of the portion protruding from the lower column. The lower end of the upper pillar is covered on the outer side of the four joint plates, and a bolt is screwed into a nut of the joint plate through a bolt insertion hole formed in the upper pillar to join the joint plate to the joint plate.

[0006]

With this construction, each joint plate is bolted to the lower column in advance at the factory, and at the site, the portion projecting from the lower column of the joint plate is covered with the upper column and bolted together, so that The pillars of can be joined. In this way, the upper and lower columns can be joined only by bolt joining without the need for welding. Therefore, the joining positions of the upper and lower columns are not limited due to the convenience of field work, and the joining can be performed at any height position. Therefore, the pillars can be joined at a central height position of the floor where the columns are to be joined, that is, a height position where bending stress due to interlayer displacement of the building is minimized, and the number of bolts can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The upper column 1 and the lower column 2 are each made of a rectangular steel pipe. Bolt holes are provided at the upper ends of the lower columns 2, and four joint plates 3 are joined to the inner four side surfaces by bolts 4 and nuts 5, respectively. A part of each joint plate 3 projects upward from the lower column 2, and on the back surface of the projecting part,
A nut 7 which is aligned with the bolt insertion hole 6 formed in the joint plate 3 is fixed. As shown in FIG. 4, the fixing of the nut 7 is performed together with the washer 10 by the fixing metal fitting 9 which covers the nut 7 and is welded 8 to the joint plate 3 by the legs 9a. Further, as shown in FIG. 1, a bolt insertion hole 11 that is aligned with the bolt insertion hole 6 of the joint plate 3 is opened at the lower end of the upper pillar 1. The above processing is performed in advance at the factory.

In the field, after the lower pillar 2 is installed, the upper pillar 1
The lower end of each of the four joint plates 3 to the outside (FIG. 2), and the bolts 12 are screwed into the back nuts 7 from the bolt insertion holes 11 formed in the upper posts 2 to attach the upper posts 1 to each other. Joined to the joint plate 3. As a result, the upper and lower columns 1 and 2 are joined via the joint plate 3. High-strength bolts are used for the bolts 4 and 12, and friction bolts are joined.

As shown in FIG. 3, the height position at which the upper and lower columns 1 and 2 are joined in this joint structure 13 is the center height of any floor 1F to 3F in the building 14. Reference numeral 15 indicates a beam on each floor.

According to this structure, the bolts 4,
The upper and lower columns 1 and 2 can be joined only by joining 12. Therefore, the joining positions of the upper and lower columns 1 and 2 are not limited due to the convenience of field work. Further, as shown in FIG. 3, the joint structure 13 can be joined at a central height on any floor 1F to 3F of the building 14, and the central height position is a height position where bending stress due to interlayer displacement of the building 14 is minimized. Therefore, large joining strength is not required, and the number of bolts 4 and 12 can be reduced.

[0011]

EFFECTS OF THE INVENTION The joint structure for prismatic steel pipe columns according to the present invention has joint plates attached to the inner four side surfaces of the lower column, and nuts are fixed to the rear surface of the upper protruding portion of the lower column, and the upper column is composed of the above four sheets. Since the joint plate is covered and bolted to the nut on the back side, the upper and lower columns can be joined only by bolting, and on-site welding can be eliminated. Further, since the on-site welding is unnecessary in this way, the joining position of the upper and lower columns can be set to the central portion of the floor where the bending stress is small, and thus the number of bolts can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view of the joined state.

FIG. 3 is an explanatory diagram showing a joint portion in the same building.

FIG. 4 is a perspective view showing a fixing structure of a back nut.

FIG. 5 is a side view of a conventional example.

[Explanation of symbols]

1 ... Upper column, 2 ... Lower column, 3 ... Joint plate, 4 ... Bolt, 7
... nuts, 12 ... bolts

Claims (1)

[Claims] 1. A lower pillar made of a rectangular steel pipe is bolted to four inner side surfaces at the upper end of the lower pillar, and four joint plates partially projecting upward from the lower pillar are bolted to each other. On the back surface of the part protruding from the side pillar, a nut that is aligned with the bolt insertion hole formed in this joint plate is fixed, and the lower end of the upper pillar made of rectangular steel pipe is covered on the outside of the four joint plates. A joint structure for a rectangular steel pipe column, wherein the upper column is joined to each of the joint plates with a bolt screwed to the nut through a bolt insertion hole formed in the column.