JPH076228B2 - Fixing structure of column pedestal and steel column - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a column base portion, a column base metal fixture, and a fixing structure for constructing a steel frame column on a concrete foundation in a civil engineering building structure.

[Conventional technology]

Steel columns in civil engineering structures (hereinafter referred to as columns) are generally built on concrete foundations. In this case, the material strength of the column is higher than that of the concrete foundation.
Since it is more than 10 times as large, the stresses generated in the columns are dispersed and transmitted to the concrete foundation, so that the metal fittings fixed to the column base are fixed to the concrete foundation with anchor bolts.

Various types of such column pedestals have been proposed and put to practical use. One example thereof is the invention disclosed in Japanese Patent Publication No. 56-30425. According to the present invention, as shown in FIG. 4, a protrusion 3 slightly larger than the cross-sectional shape of a pillar 5 is provided on the upper surface of a rectangular bottom plate 2, and a pedestal 4 having a hole for fitting an anchor bolt is provided on the bottom plate 2. It is a thing.

The pillar base metal fitting 1 is transported to the site after the pillar 5 is fixed to the projecting portion 3 by butt welding in a factory or the like, and then the hole provided in the pedestal 4 is fitted into the anchor bolt planted in the concrete foundation to be nut. Fix it.

[Problems to be solved by the invention]

As is well known, the pillars of civil engineering structures are compressed in the axial direction,
There are three stresses, bending moment and shearing force,
In particular, the bending moment is more dominant than other stresses.
For this reason, the anchor bolt that resists the bending moment needs to be attached to the outside of the column base 1 as far as possible, that is, at a position distant from the protrusion 3. That is, if the bending moment applied to the steel column is Mo, the fixing force of the anchor bolt is S, and the distance between the anchor bolt and the steel column is L, the anchor column can be fixed to the steel column by Mo.
It is necessary that ≦ 2 SL, and a large bending moment Mo can be endured by increasing the distance L between the anchor bolt and the steel column. However, in order to attach the anchor bolt at a position away from the protrusion 3,
Therefore, the bottom plate 2 must be increased in size, resulting in a problem that not only the overall weight becomes large and the workability is deteriorated, but also the material cost is increased. In addition, there is a problem that this column base metal fitting 1 can be used only for a construction method of fixing the column 5 to the upper end portion of the projecting portion 3, and cannot be used for other construction methods (fitting type excavation method).

[Means for solving problems]

A fixing structure of a column pedestal and a steel frame column according to the present invention, a bottom plate,
The bottom plate has a fitting portion of a steel frame projecting from the center of the upper surface of the bottom plate, and a pedestal provided with holes for fitting anchor bolts at four corners of the bottom plate. A column pedestal having a hole through which the steel frame column is inserted, and the steel frame column is inserted into the hole and the column pedestal and the steel frame column are welded at the upper end side and the lower end rear side of the hole. It was done.

[Action]

According to the present invention, a column is fitted into a hole of a column pedestal, and the column is fixed to the column pedestal by fillet welding on the upper end side and the lower end side of the hole.

〔Example〕

FIG. 1 (a) is a plan view of an embodiment of a column base metal article according to the present invention, and FIG. 1 (b) is a sectional view taken along line AA. In both figures,
Reference numeral 11 denotes a column base metal piece integrally formed by casting or forging, and a fitting portion 13 of a protruding column 17 is provided at the center of the upper surface of the bottom plate 12. 14 is a hole formed through the bottom plate 12 and the fitting portion 13, the hole 14a formed in the fitting portion 13 is substantially equal to the outer diameter of the pillar 17, and the hole 14b formed in the bottom plate 12 is It is chosen small, and both holes 14a, 14b are continuous on the inclined surface 14c. The fitting portion 13 is formed with a thickness that allows the stiffening effect of the bottom plate 12 to be obtained. Denoted at 15 to 15c are pedestals having holes 16 to 16c for fitting with anchor bolts provided at four corners of the bottom plate 12.

Next, the operation of the present invention configured as described above will be described. First, in a factory, etc., the holes 14 provided in the fitting portion 13 of the pillar pedestal 11
Insert the lower part of the pillar 17 into the. At this time, the pillar 17 is positioned at the lower end of the hole 14a, and a groove 18 is formed between the pillar 17 and the inclined surface 14c. Next, the upper end of the fitting part 13 and the outer periphery of the pillar 17 are welded by fillet welding 19, and the groove 18b is formed from the hole 14b of the bottom plate 12.
Weld by butt welding (may be partially melted) 20. Then, the column base metal 11 integrated with the column 17 is transported to the construction site, and the anchor bolts embedded in the concrete foundation are fitted and fixed with the holes 16 to 16c.

FIG. 2 shows another embodiment of the present invention. In the embodiment shown in FIG. 2 (a), the hole 14 provided at the central portion of the column base 11 has the same size from the bottom plate 12 to the fitting portion 13. Pillars formed and fitted into this
Weld the bottom and top of 17 to the column pedestal 11 respectively, and fillet weld 19,2
It was welded at 0a.

Further, in the embodiment shown in FIG. 2B, the hole 14c is formed smaller than the hole 14a, and both are continuously formed on a substantially horizontal surface to form a stepped portion 14d. ,
Both are welded by fillet welding 19,20a.

Further, the embodiment shown in FIG. 7 (c) has holes similar to those shown in FIG.
14 are formed in the same size, and the pillar 17 is inserted into the hole 14 so that the lower part projects, and the top and bottom of the hole 14 and the pillar 17 are fillet welded.
It was welded with 9,20a, and when fixing it to the concrete foundation 21, a larger hole 21a was excavated just below the hole 14, and the protruding part of the pillar 17 was inserted into this hole 21a to anchor it. Fix with bolts and fill the gap with grout mortar.

FIG. 3 is a schematic diagram showing an application example of the present invention.

Since the column base metal shown in FIG. 4 as a conventional example is joined to the concrete foundation only by the anchor bolts, there is a problem that it tends to rotate when the external force in the lateral direction is applied to the column, and the fixing degree tends to be low. there were.

Therefore, as shown in FIG. 3, anchor bolts 23, 23a with a head that are erected from the concrete foundation 21 are inserted from the hole 14 of the column base metal fitting 11 to the inside of the column 17. And the column base 11
Is fastened with anchor bolts 22 to 22C and is filled with grout mortar 24 etc. from the hole 17a provided in the pillar 17
Anchor bolt 22 ~ 22C and headed anchor bolt 23,
It is fixed to the concrete foundation by both 23a.

With this configuration, the bending rigidity of the column base metal 11 can be significantly improved, and the rotation of the column base metal 11 can be suppressed even when an external force in the lateral direction is applied to the column 17. Therefore, the concrete foundation 21 and the pillar 17 can be joined more firmly.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, for example, the column base 11 is a bottom plate,
Other shapes may be used as long as they have a fitting portion and a pedestal, and are provided with a hole that penetrates the bottom plate and the fitting portion and into which a column can be fitted.

[Effects of the Invention] As is clear from the above description, according to the present invention, the following remarkable effects can be obtained.

(1) Since the fitting part is provided on the pillar pedestal and a large hole is provided through the fitting part and the bottom plate, not only the weight is light and the workability is improved, but also the material for the manufacturing can be saved. Therefore, the cost can be reduced.

(2) Since the pillar is fitted into the fitting portion of the pillar pedestal and fixed to the pillar pedestal by fillet welding, the pillar is firmly and surely fixed to the pillar pedestal, and the work is easy. .

(3) When an anchor bolt with a head is provided on a concrete foundation, the anchor bolt with a head can be inserted into the column through the hole provided in the fitting part of the column pedestal, so By filling the grout mortar or the like, the concrete foundation and the column can be joined more firmly.

[Brief description of drawings]

1 (a) is a plan view of an embodiment of the present invention, FIG. 1 (b) is a sectional view taken along the line AA, and FIGS. Explanatory drawing, FIG. 3 is a longitudinal cross-sectional view showing an application example of the present invention, and FIG. 4 is a cross-sectional view showing an example of a conventional column pedestal and a fixing structure for the column. 11: Pillar base metal fittings, 12: bottom plate, 13: fitting part, 14: hole, 14c: inclined surface, 15 to 15c: pedestal, 17: pillar, 18: groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakatsu Sasaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor, Shoji Matsui 390-5-511, Takatsu-ku, Kawasaki-shi, Kanagawa (72) Inventor Yutaka Matsumura 1906-5 Shimotsuruma, Yamato City, Kanagawa Prefecture

Claims (1)

[Claims] 1. A bottom plate 12, a fitting portion 13 of a steel column 17 projecting from the center of the upper surface of the bottom plate 12, and holes 16 to 16C provided at four corners of the bottom plate 12 and fitted with anchor bolts. Equipped pedestal 15
15C, the column base metal fitting 11 is provided with a hole 14 that penetrates the bottom plate 12 from the upper end of the fitting portion 13 to fit the steel frame column 17, and the steel frame column 17 is fitted into the hole 14. Then, the structure for fixing the column base metal member and the steel frame column by welding the column base metal member 11 and the steel frame column 17 on the upper end side and the lower end side of the hole 14.