JPH05255973A - Fixture for column base - Google Patents

Abstract

PURPOSE:To eliminate the necessity of securing a steel frame column to a fixture for the base of the column by welding, forming recesses at predetermined positions at each side surfaces of a protrusion of the fixture, and by forming a bolt hole in each of the recesses so as to fasten the protrusion and the steel frame column together by bolts. CONSTITUTION:A fixture 1 for the base of a steel column, is composed of a bottom plate part 2, and a protrusion 3 having a receiving seat 3c which is set on the bottom plate part 2 through the intermediary of a taper part. The bottom plate part 2 is formed therethrough with bolt holes 2a into which anchor bolts are screwed. Further, four of recesses the total number of which is sixteen, are formed in each of the side surfaces of the protrusion 3, and a bolt hole 3a is formed piercing through the center part of each of the recesses 3b. After the base of the steel column is fitted on the protrusion 3 of the fixture 1, they are joined together by fastening bolts into the bolt holes 3a, and accordingly, the steel frame column is deformed in parts around the bolt holes 3a so that these parts are fitted and fixed in the recesses 3b. Thereby it is possible to eliminate the necessity of the welding between the steel frame column and the fixture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base metal member for joining a steel frame column and a foundation concrete.

[0002]

2. Description of the Related Art In order to erect steel columns used in steel-framed or steel-framed reinforced concrete buildings on foundation concrete, first, a column pedestal is fixed to the steel column, and the steel pedestal to which the column pedestal is attached is installed. Although the technique of standing is used,
The conventional means for joining a column pedestal and a steel frame column is such that the lower end of the steel column and the upper end of the projecting portion of the column pedestal are welded together, or the lower side face of the steel column and the projecting side face of the column pedestal are simply opposed to each other. It was arranged and bolted.

[0003]

Among the above-mentioned conventional techniques, the one in which the lower end of the steel frame column and the upper end of the projecting portion of the column pedestal are welded and joined may delay the construction period due to the shortage of welding workers in recent years. However, there is a risk that the quality may become unstable due to welding. Further, in the case where the lower side surface of the steel column and the side surface of the protruding portion of the column pedestal are simply arranged so as to be joined by bolts, the tightening force per bolt is comparatively small, so that between the steel column and the column pedestal. In order to secure the necessary frictional force, it is necessary to arrange a large number of bolts, which causes a problem that the length of the projecting portion of the column pedestal becomes long and the cost of the column pedestal increases. Therefore, an object of the present invention is to provide a column pedestal which does not require welding work with a steel column and has a short protruding portion.

[0004]

According to the present invention, there is provided a bottom plate portion fastened to a foundation concrete, and a projection portion standing on the bottom plate portion and projecting in a shape corresponding to a cross section of a steel frame column. In a column pedestal in which a bolt hole for fastening a steel column to a protrusion is horizontally drilled, a recess is formed in the protrusion, and the bolt hole is opened in the recess to achieve the above object. It is a thing.

[0005]

The lower side surface of the steel column is oppositely disposed to the side surface of the projecting portion on the side where the recess is provided, or the side surfaces of an appropriate joining member to be joined to the steel column are oppositely disposed, and then bolt joining is performed
The circumference of the bolt hole of the steel column or the joining member is deformed by bolting and fits into the recess of the protruding portion, so that the necessary frictional force between the steel column and the column pedestal can be secured by a few bolts. .. Alternatively, a convex portion that fits the concave portion is provided around the bolt hole of the steel column or an appropriate joining member that is joined to the steel column, and the steel column or the joining member is arranged so that the convex portion fits into the concave portion of the projecting portion. When tightened with bolts, the necessary frictional force between the steel column and the column pedestal can be secured with a small number of bolts.

[0006]

Embodiments of the present invention will be described with reference to the drawings. 1, 2 and 7 show a first embodiment of the present invention, in which a column pedestal 1 comprises a bottom plate portion 2 and a projecting portion 3, and the bottom plate portion 2 is an anchor bolt raised from a foundation concrete 4. 5
A bolt hole 2a for fastening is formed, and the projecting portion 3 projects upward from the bottom plate portion 2 in a shape facing the lower inner surface of the rectangular tubular steel frame column 6. Bolt holes 3a for fastening to the steel column 6 are provided on each of the four sides of the protruding portion 3 on each side.
16 bolts are provided in the horizontal direction, and in the present embodiment, the bolt holes 3a are threaded bolt holes that pass through each side of the protruding portion 3. Further, the outer surface of the protruding portion 3 is provided with four recessed portions 3b on each side, for a convenience of sixteen,
The opening on the outside of the bolt hole 3a opens into this recess 3b. A receiving seat 3c for supporting the lower end surface of the steel frame column 6 is provided on the entire circumference of the outer surface of the base of the projecting portion 3, and a drain hole 2b is provided at the center of the bottom plate portion 2.

This embodiment is constructed as described above,
The steel column 6 is inserted into the projecting portion 3 of the column pedestal, and the inner surface of the lower portion of the steel column 6 and the outer surface of the projecting portion 3 are arranged so as to face each other. 3 and 3 are joined, the periphery of the bolt hole 6a of the steel frame column 6 is deformed by bolting and fits into the concave portion 3b of the projecting portion. Therefore, welding work is not performed, and the required frictional force of 16 bolts 7 at most is required. It is possible to join the steel column 6 and the column pedestal 1 by securing. Further, in this embodiment, since the column base 1 is provided with the receiving seat 3c for supporting the lower end surface of the steel column 6, the steel column 6 can be easily positioned in the axial direction. As the material of the column base metal 1, cast steel, forged steel, or spheroidal graphite cast iron can be used.

For the bolt hole 3a of the protruding portion, a nut can be used as a bolt hole without a screw, and in that case, the drain hole 2b needs to be formed larger to be a working hole. Further, the bolt hole 3a may be a bottomed bolt hole, and at that time, it is necessary to use a screwed bolt hole. On the other hand, with respect to the bolt 7, generally, in tightening the bolt, it is possible to use a stud bolt 7a and a nut 7b as shown in FIGS.

In the above embodiment, the outer surface of the protruding portion 3 and the inner surface of the lower portion of the steel frame column 6 are directly brought into contact with each other. However, as shown in FIGS. 5 and 6, the outer diameter of the protruding portion 3 is made slightly smaller. ,
It is also possible to clamp and fix the steel column 6 and the column leg metal fitting 1 by interposing a gap adjusting plate 8 on two adjacent sides of the four sides of the steel column 6. Further, with respect to the steel frame pillar 6, in the above embodiment, the periphery of the bolt hole 6a of the steel frame pillar was fitted into the concave portion 3b of the projecting portion by bolting, but the convex portion that fits into the concave portion 3b of the projecting portion is preliminarily pressed by the steel frame or the like. It is also possible to form the steel column 6 around the bolt hole 3a of the column 6 so that the convex portion fits into the concave portion 3b of the projecting portion. At that time, the surface of the steel column 6 on the side opposite to the side where the convex portion is provided is
It can also be formed flat. When the plate thickness of the steel column 6 becomes thick and the bolt hole 6a of the steel column does not fit into the concave portion 3b of the projecting portion by bolting, it is necessary to previously provide the convex portion on the steel column 6. The convex portion may be provided when the plate thickness of the steel column 6 is thin.

Next, FIG. 8 shows a second embodiment in which the shape of the recess of the protrusion 3 is a recess 3d which is continuous in the horizontal direction. That is, in the first embodiment described above, as the shape of the concave portion 3b of the projecting portion, the circular concave portion 3b is provided for each opening of each bolt hole 3a as shown in FIG.
Since the frictional force required between and is in the vertical direction within the plane orthogonal to the bolt axis, the concave portion 3 as in the second embodiment is used.
Even if d is continued in the horizontal direction, the frictional force in the vertical direction can be secured.

Next, FIGS. 9 and 10 show a third embodiment,
The vicinity of the opening on the inner surface side of the threaded bolt hole 3a of the projecting portion is projected inward to form the overhanging portion 3e to secure a necessary length for screwing, and the other portion is formed thin. As a result, the weight and cost of the pedestal metal fitting 1 can be reduced.

Next, FIGS. 11 and 12 show a fourth embodiment in which bolt holes 3a are formed so as to form bolt holes without screws, and recesses 3b are formed in the respective openings of the bolt holes 3a. A work hole 2c is provided at the center of the bottom plate portion 2. In order to use the pillar base metal fitting 1, for example, the first joint member 9a is arranged on the inner surface of the steel frame pillar 6 so that the lower end surfaces of the steel frame pillar 6 and the first joint member 9a are located above the protrusion 3 of the pillar base metal fitting. The second joint member 9b is arranged on the outer surface of the steel column 6 and the third joint member 9c is arranged on the inner surface of the first joint member 9a, and the steel column 6 and the respective joint members 9a, 9b, 9c are bolted. Then, the second joint member 9b and the third joint member 9c and the protrusion 3 are bolted together by the high-strength bolt 7 to fix the steel column 6 and the column base metal piece 1. That is, the above first to third
In the embodiment, the vertical force is supported by the one-sided friction in which the lower inner surface of the steel column and the outer surface of the projecting portion of the column pedestal directly or indirectly contact each other, but in this fourth embodiment, the joining member is supported. By using the two-sided friction in which the inner and outer surfaces of the projecting portion of the pillar pedestal are brought into contact with each other, the supporting force in the vertical direction is improved. In addition, the arrangement position of the steel column 6 is the first,
It can be replaced with any of the second and third joining members 9a, 9b, 9c.

Next, FIGS. 13 and 14 show a fifth embodiment. In this embodiment, the column base metal fitting 1 when the steel frame column 6 is H-section steel is shown.
The projecting portion 3 of the column base metal is formed so that the portion contacting the lower end surface of the web portion of the H-section steel projects low and the portion facing the outer surface of the flange portion projects high. That is, in the above-mentioned first to fourth embodiments, the steel column 6 has a rectangular tubular shape, that is, a closed cross-sectional shape. Therefore, it is preferable from the standpoint of workability to dispose the inner surface of the steel column 6 and the outer surface of the protrusion 3 so as to face each other. However, when the steel column 6 has an open cross section like H-section steel,
It is better to bring the outer surface of the flange portion and the inner surface of the protruding portion 3 into contact with each other as shown in FIGS. 13 and 14.

Next, FIGS. 15 and 16 show a sixth embodiment, and this embodiment also shows a column base metal article when the steel frame column 6 is an H-shaped steel, but this column base metal article is divided into two. Ie 1
The steel column 6 of the book is fixed by the two column bases 1 and 1. Since the shape of the column bases 1 and 1 is simple, it is easy to manufacture, and therefore the manufacturing cost can be reduced.

[0015]

As described above, according to the present invention, it is not necessary to perform welding work with a steel column, and the necessary frictional force between the steel column and the column pedestal can be secured with a small number of bolts. A column pedestal having a short projection and a low manufacturing cost was obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

[Figure 2] Same cross-section

FIG. 3 is a vertical sectional view showing another aspect of the bolt.

FIG. 4 is a sectional view of the same plane.

FIG. 5 is a vertical cross-sectional view showing a mode in which a gap adjusting plate is interposed.

FIG. 6 is a sectional view of the same plane

FIG. 7 is a perspective view of the first embodiment.

FIG. 8 is a perspective view of a second embodiment.

FIG. 9 is a vertical sectional view of a third embodiment.

FIG. 10 is a sectional view of the same plane.

FIG. 11 is a vertical sectional view of a fourth embodiment.

FIG. 12 is a sectional view of the same plane.

FIG. 13 is a vertical sectional view of a fifth embodiment.

FIG. 14 is a sectional view of the same plane.

FIG. 15 is a vertical sectional view of a sixth embodiment.

FIG. 16 is a sectional view of the same plane

[Explanation of symbols]

1 ... Pillar pedestal 2 ... Bottom plate 2
a ... Bolt hole 2b ... Drain drain hole 2c ... Working hole 3
... protruding portion 3a ... bolt hole 3b, 3d ... recessed portion 3
c ... Catch 3e ... Overhang 4 ... Basic concrete 5
… Anchor bolts 6… Steel columns 7… Bolts 7
a ... Implanting bolt 7b ... Nut 8 ... Gap adjusting plate 9a, 9b, 9c ... Joining member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidefumi Kunabe 1-9-1, Kitahama, Wakamatsu-ku, Kitakyushu City, Fukuoka Prefecture Hitachi Metals Co., Ltd. Wakamatsu Factory (72) Takashi Kitano, Kitahama-ku, Wakamatsu-ku, Kitakyushu, Fukuoka No. 9-1 Hitachi Metals Co., Ltd. Wakamatsu Plant (72) Inventor Tadao Takagi 4-1-1, Toyo, Koto-ku, Tokyo Hitachi Machinery Co., Ltd. (72) Inventor Hisa Funayama 4-Toyo, Koto-ku, Tokyo 1-13 No. 13 Hitachi Machinery Co., Ltd. (72) Inventor Jun Yamada No. 1-12 Toyo, Koto-ku, Tokyo 13 In Hitachi Machinery Co., Ltd. (72) Yoshimasa Mizuguchi 4-1-1 Toyo, Koto-ku, Tokyo No. 13 within Hitachi Koki Co., Ltd.

Claims (5)

[Claims] 1. A bottom plate portion fastened to foundation concrete,
A column pedestal having a protrusion that stands upright on the bottom plate and protrudes in a shape corresponding to the cross section of the steel column, and a bolt hole for fastening the steel column to the protrusion is horizontally formed in the protrusion. A column base metal article, wherein a recess is formed in the protrusion, and the bolt hole is opened in the recess. 2. A column pedestal according to claim 1, wherein the bolt hole is formed so as to penetrate therethrough, and the recess is formed in each of both openings of the bolt hole. 3. The column base metal article according to claim 1, wherein the projecting portion is projectingly formed in a shape corresponding to a part of a cross section of the steel frame column. 4. The column base metal fitting according to claim 1, 2 or 3, wherein a seat for supporting the lower end surface of said steel frame column is provided. 5. The column base metal article according to claim 1, 2, 3 or 4, which is formed of cast steel, forged steel, or spheroidal graphite cast iron.