JP2675716B2 - Column base structure of square steel tubular column - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid-joint non-welded column base structure of rectangular steel pipe columns.

[0002]

2. Description of the Related Art Conventionally, when a column base of a rectangular steel pipe column is rigidly joined, for example, a structure shown in FIG. 4 or 5 is adopted.
That is, the base plate 30 is attached to the lower end of the square steel tubular column 32.
Are previously joined at the factory by welding 33,
This is a structure in which the base plate 30 is fastened and fixed to the anchor bolt 35 of the foundation 34. In the example of FIG. 4, the base plate 30 has a thick center, and in the example of FIG. 5, the base plate 30 has a uniform thickness.

[0003]

However, in the above-mentioned conventional structures, all require a welding step of the base plate 30 in the factory, and the rectangular steel pipe columns 32 and the base plate 30 are both heavy members and large members. It takes a lot of time to inspect the temporary assembly during welding and the welding location. In addition, a problem of welding distortion occurs. In addition, pillar 32
Since a large jig like this is welded, a large jig is required for temporary assembly, it takes time to replace the jig when changing the type of pillar, and it is also wide for storing unused jigs. You need a place. These various factors increase the manufacturing cost.

An object of the present invention is to provide a column base structure of a prismatic steel pipe column which can be assembled without welding, which eliminates the need for jigs, eliminates welding distortion, stabilizes quality, and lowers manufacturing costs. That is.

[0005]

The column base structure of the rectangular steel tube column according to the present invention is obtained by connecting a base plate by bolts using four column base hardware instead of welding. That is,
Four standing pieces of inverted T-shaped column base metal fittings are bolted to each of the four side faces at the lower end of the rectangular steel pipe column. Further, a base plate is laid over the bottom surface of the bottom piece of these four column pedestals, and bolted to each bottom piece. This base plate is placed on the foundation and fixed to anchor bolts . Each pillar
The bottom piece of the metal fitting is a trapezoidal planar shape with the top center side of the pillar.
And Inside the prismatic steel pipe pillar, the four pillar base metal fittings
The reinforcement plate that overlaps over the upper surface of the bottom piece of
Reinforcing plate to the bottom piece of each pillar pedestal and the base
Bolt together with the plate. The anchor bolt
Penetrates the base plate and the bottom piece of the column pedestal
You.

[0006]

According to this structure, since the base plate is fixed by using the column base hardware, the base plate can be joined to the square steel tube column without welding. The column pedestal is composed of an inverted T-shaped member, and the standing pieces thereof are bolted to the four side surfaces of the rectangular steel pipe column, so that rigid joining can be performed only by bolting. A bolt head projects from the lower surface of the base plate, and the projecting portion effectively acts on the shearing force of the column base.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The column 1 is made of a rectangular steel pipe, and four column bases 3 having a structure shown in a perspective view in FIG. That is, the column base 3
Is an inverted T-shaped member composed of a bottom piece 4 and a standing piece 5,
The bottom piece 4 is formed in a trapezoidal shape. The standing piece 5 is formed with a plurality of bolt insertion holes 6 aligned with the respective bolt insertion holes 2 on the lower end side surface of the column 1. An anchor bolt insertion hole 7 and a bolt insertion hole 8 are formed on the bottom piece 4 outside the standing piece 5,
A bolt insertion hole 9 is formed inside. Each of these four pillar legs 3 has a standing piece 5 arranged on the four side surfaces at the lower end of the pillar 1, and is joined to the pillar 1 by a high-strength bolt 10 and a nut 11 inserted into the bolt insertion holes 2 and 6. .

In this way, the base plate 12 and the reinforcing plate 13 are bolted to the four column bases 3 which are bolted to the column 1. The base plate 12 is a square plate,
Anchor bolt insertion hole 14 and bolt insertion hole 15 are provided in a portion along each side, and a bolt insertion hole 16 is formed in the central portion. The reinforcing plate 13 is a rectangular plate smaller than the pillar 1, and has bolt insertion holes 19 formed along four sides.

The base plate 12 is superposed on the lower surface of the bottom piece 4 of each column base metal piece 3, and is joined to the bottom piece 4 by a high-strength bolt 17 and a nut 18 inserted into the bolt insertion holes 8 and 15. The reinforcing plate 13 is arranged so as to overlap with the upper surface of the bottom piece 4 of each column base metal fitting 3, and is inserted from the lower surface of the base plate 12 to the respective bolt insertion holes 16, 9 and 19 to penetrate the one side bolt 20.
Thus, the pillar base 4 and the base plate 12 are integrally joined. In addition, the bolt 1 for joining the column base metal piece 3 to the column 1
Since 0 can be inserted into the column 1 from the opening portion formed at the center between the four column base metal members 4, an ordinary torcia bolt can be used.

The base plate 12 is arranged on the foundation 21, and is fixed to the anchor bolt 22 of the foundation 21 with the nut 23 together with the column base metal 3. At this time, a bun-shaped mortar stand 24 is placed on the concrete upper surface 21b of the foundation 21 as shown in FIG. 3C, the pillar 1 is built, the base plate 12 is placed on the mortar stand 24, and the anchor bolts 22 The nut 18 is screwed on. After that, non-shrinkable mortar or the like is poured to form the top mortar portion 21a. Instead of using the mortar base 24, a level nut (not shown) is screwed on the anchor bolt 22, and the base plate 12 is placed on the level nut (not shown).
Concrete upper surface 21 of base plate 12 and foundation 21
You may make it form the clearance gap for forming the mortar part 21a with b.

According to this column base structure, the base plate 12 is fixed by using the column base metal 3 in this manner, so that the base plate 12 can be joined to the rectangular steel pipe column 1 without welding. Moreover, since the column base metal fitting 3 is an inverted T-shaped metal fitting and is joined to the four side surfaces of the pillar 1,
A rigid and rigid connection can be achieved only by bolt connection. Since the column base metal member 3 is composed of an inverted T-shaped member, it can be easily processed by cutting an H-shaped steel.

As described above, since the column base structure can be formed without welding, a large jig for welding is not required, there is no problem of welding distortion, and the quality is stable. Further, the manufacturing time can be shortened and the manufacturing cost can be reduced. The heads of the bolts 17 and 20 project from the lower surface of the base plate 12, and by embedding the heads in the top mortar portion 21a, they effectively act on the shearing force of the column base.

Although the reinforcing plate 13 is provided in the above embodiment, the plate 13 does not necessarily have to be provided.

[0014]

The column base structure of the square steel tubular column according to the present invention has the following structure.
Since each column pedestal metal is bolted to each of the four side faces at the lower end of the rectangular steel pipe column, and the base plate is bolted to these column pedestals, welding work is not required to join the base plates and the manufacturing time is shortened. Cost can be reduced and quality is stable. In addition, a large jig for welding is unnecessary. The column base metal member is an inverted T-shaped member and is joined to each of the four side faces of the column, so that a rigid and rigid joint can be made only by bolting.

[Brief description of the drawings]

FIG. 1A is a plan view of an embodiment of the present invention, and FIG.
FIG. 7A is a sectional view taken along the line II of FIG.

FIG. 2 is an exploded perspective view of the embodiment.

FIG. 3 is an explanatory diagram showing an assembling procedure of the embodiment.

FIG. 4 is a front view showing one conventional example.

FIG. 5 is a front view showing another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Square steel pipe column, 3 ... Column base metal fitting, 4 ... Bottom piece, 5 ... Standing piece, 10, 17 ... Bolt, 12 ... Base plate, 13
... Reinforcement plate, 20 ... One side bolt, 21 ... Foundation, 22 ... Anchor bolt

Claims (1)

(57) [Claims] 1. An inverted T-shape is provided on each of four side surfaces at the lower end of a rectangular steel pipe column.
-Shaped column base metal fittings, by bolting the standing pieces of
The bottom piece of the object has a trapezoidal planar shape with the top center side of the pillar as the top bottom.
And, providing a base plate that overlaps over the lower surface of the bottom piece of these four column base hardware, and bolted the base plate to the respective bottom pieces, within the RHS Column, the four
A reinforcement plate that overlaps the top surface of the bottom piece of
This reinforcement plate is provided with the bottom piece of each of the column pedestals and
Bolt joined integrally with the base plate, Oyo these base plate by placing the base plate on a foundation
Column base structure of RHS Column fixed to A Nkaboruto penetrating the bottom piece of fine said pedestal hardware.