JPH05272145A - Steel column base - Google Patents

Abstract

PURPOSE:To improve rigidity by providing a stiffener fitting whose arms are crossing, an anchor bar whose end is engaged with a bolt hole provided at the tip end of the arm, and a nut screwed into a screw groove provided at the end of the anchor bar. CONSTITUTION:A leveling concrete 11 is placed with a leveling concrete anchor 10. Then, after a center line of a steel column is placed in horst on the upper surface of the concrete 11, an anchor bolt 6 for erection is mounted on the horst center line on the anchor 10. Then, after a mold 2 integral with upper and lower stiffener fittings 8 and 9 are engaged with the bolt 6 and fixed, a base main reinforcement 18 is inserted into a hole of arms of the fittings 8 and 9 and a fixing nut 17 is screwed into its screw groove. Concrete is placed in the base 7 and after solidification, the nut 17 is tightened to give tension. Further, a steel column 1 provided with an anchor mounting plate 5 is inserted into the mold 2, the mounting plate 5 is engaged with the bolt 6 and fixed, and then, after-placing concrete 3 is placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel column for transmitting the force applied to the base of a column of a part of a concrete foundation beam, called a column base of a building, for fixing the steel column of the column to the foundation beam. Regarding the legs.

[0002]

2. Description of the Related Art In the prior art, the structure of an embedded column base with a box is as disclosed in Japanese Patent Laid-Open No. 63-165626, using a square steel pipe or the like as a box with a box.
The main bar or anchor bar of the foundation beam and the square steel pipe of the formwork are connected by welding or the like so that all the forces applied to the steel column are directly transmitted to the foundation beam through the square steel pipe. It was

FIG. 5 is a vertical sectional view for explaining the above proposed technique. FIG. 6 is a plan view for explaining the proposed technique. In FIGS. 5 and 6, reference numeral 51 is a steel column. 53 is a post-cast concrete made of a filler. 55 is an anchor mounting plate. Reference numeral 56 is an erection anchor bolt. Reference numeral 57 is a form steel pipe, and the erection anchor bolt 56 is welded to the upper end of the form steel pipe. Reference numeral 58 is a main beam of the foundation beam. Reference numeral 59 is an anchor muscle. Anchor mounting plate 55 welded to the steel column 51 when the steel column 51 is built
The steel column 51 is temporarily fixed to the erection anchor bolt 56 via the. Since the erection anchor bolt 56 is welded to the form steel pipe 57, the steel column 51 is temporarily fixed to the foundation beam through this.

Next, a construction method based on the above construction will be described. The basic beam main bar 58, the anchor bar 59 and the band bar are arranged in the form for forming the base beam, and the box-out form made of the form steel pipe 57 is arranged at the position where the column base is embedded. The main beam is completed by connecting the beam main bars 58 by welding or by arranging U-shaped bars so as to surround the outer circumference of the form steel pipe 57 and placing concrete. Next, after the foundation beam is completed, the steel pillars 51 are temporarily fixed to the erection anchor bolts 56 by the erection anchor bolts 56 via the anchor attachment plates 55. After this temporary fixing work, that is, after erection, a post-cast concrete 53 made of a filler having a strength higher than that of the concrete for the foundation beam is placed in the space portion of the form steel pipe 57.

However, the above-mentioned Japanese Patent Laid-Open No. 63-1656.
The technique proposed in Japanese Patent No. 26 has a problem in that it is difficult to set the form steel pipe accurately, and the pulling proof strength is low and it is weak against tensile load. Furthermore, since the conventional construction before the construction using the box-out type embedded column base had a structure as shown in FIG. 7, since the joining strength of the moment of the steel column 72 is borne only by the erection anchor bolt 71. However, there is a problem that it is necessary to use a thick bolt having a long embedding length for the erection anchor bolt 71 because the degree of fixation is insufficient, and it is also necessary to make the second moment of area of the steel column 72 extremely large. It was

[0006]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and the column base fitting of the column of the box-embedded embedded column leg portion is more strongly fixed to the column base and the degree of fixing is improved. An object of the present invention is to provide a steel column pedestal having a stiffener metal, which has a high joining strength, may be further shortened in the embedded length, can maintain a high performance even under a tensile load, and has a short construction period.

[0007]

A steel column post according to the present invention is a box-embedded embedded concrete for fixing a steel column of a building. In this case, the arms are orthogonal to each other-a steel plate stiffener hardware and the arms. It is characterized in that it has an anchor bar having an end fitted into a bolt hole provided at the tip part and a nut screwed into a screw groove provided at the end of the anchor bar.

[0008]

The steel column base having the orthogonal type thick steel plate stiffener hardware constructed as described above is such that the main reinforcement of the foundation beam can be tensioned from the steel column base by the stiffener hardware very accurately, and the steel column base is Since it has become possible to make the dimensions of extremely accurately, it is possible to obtain a steel column base with high rigidity, high degree of fixation, and high yield strength.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a steel column base provided with an orthogonal type thick steel plate stiffener hardware of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a vertical sectional view of a steel column base according to the present invention. FIG. 2 is a plan view of a steel column base according to the present invention. The steel column in this example is a side column of a building.

The construction method of the steel column base of FIGS. 1 and 2 is as follows. First, the discarded concrete 11 is placed together with the discarded concrete anchor 10. Then, the center line of the steel column is grounded on the upper surface of the discarded concrete 11. Next, the erection anchor bolt 6 is arranged and attached on the ground ink center line on the discarded concrete anchor 10. The attachment method is tapping the discarded concrete anchor 10 and screwing the erection anchor bolt 6
Alternatively, the discarded concrete anchor 10 and the erection anchor bolt 6 may be welded. The upper stiffener metal piece 8 and the lower stiffener metal piece 9 are attached to the formwork 2 by welding in advance in a manufacturing factory. The mold 2, the upper stiffener metal piece 8, and the lower stiffener metal piece 9 are integrally assembled and fitted into the erection anchor bolt 6 and fixed with a nut.

Next, the main beam 18 of the foundation beam is passed through the holes formed at the tips of the arms of the upper stiffener metal piece 8 and the lower stiffener metal piece 9, and the fixing nut 17 is screwed into the screw groove cut at the tips, whereby the foundation beam is formed. The main muscle 18 is properly focused. Next, the concrete of the foundation beam 7 is poured. At this time, concrete is not placed inside the mold 2 but a high-strength filler is placed later. After that, after the concrete of the foundation beam 7 is completely set, the fixing nut 17 is tightened to give an appropriate tension.

On the other hand, separately from this, the anchor mounting plate 5 is attached to the steel column 1 by welding at the manufacturing factory. This steel frame column 1 with the anchor mounting plate 5 attached is the formwork 2
, And the anchor mounting plate 5 is fitted to the erection anchor bolt 6 and fixed with a nut. At this time, the position of the steel frame pillar 1 can be accurately installed only by fitting. Next, a post-cast concrete 3 made of a high-strength filler is placed inside the formwork 2.

FIG. 3 is a plan view of a steel column base of another embodiment according to the present invention. The steel column in this example is the case of the central column of a building. Reference numerals 1 to 18 in the figure are the same as in the case of FIG. FIG. 4 is a vertical sectional view of a steel column base of another embodiment according to the present invention. The steel column in this example is a side column of a building.
Reference numerals 1 to 18 in the figure are the same as in the case of FIG. Figure 1
The cut surface is deviated by 90 ° from the case. The construction method of both the example of FIG. 3 and the example of FIG. 4 is the same as in the case of FIGS. 1 and 2, and is as described above.

Here, the steel column 1 is strongly fixed to the foundation beam 7 and the tension supported by the foundation beam main bar 18 is very accurately sustained to the steel column base, so that a steel column base having high rigidity, fixation and proof strength can be obtained. Be done. Moreover, the work at the construction site is simplified.

[0015]

Since the stiffener hardware 8 and 9 can accurately apply the accurate tension to the main reinforcement of the foundation beam 18 and the dimension of the steel column base can be made extremely accurately, the rigidity of the steel column base can be improved. And both the degree of fixation and the proof strength became high. In addition, the work on the job site is simplified, which has the effect of reducing the construction period and cost. Further, as a result of these, since a steel frame column base having a high degree of fixation and a high proof stress can be obtained, it is possible to obtain an effect that it can be applied to a building or the like where a large pulling force acts.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a steel column base according to the present invention.

FIG. 2 is a plan view of a steel column base according to the present invention.

FIG. 3 is a plan view of a steel column base according to the present invention.

FIG. 4 is a vertical sectional view of a steel column base according to the present invention.

FIG. 5 is a vertical cross-sectional view of a conventional steel column base.

FIG. 6 is a plan view of a conventional steel column base.

FIG. 7 is a vertical cross-sectional view of a conventional steel column base.

[Explanation of symbols]

 1 Steel Column 2 Formwork 3 Post-concrete Concrete 5 Anchor Mounting Plate 6 Construction Anchor Bolt 7 Foundation Beam 8 Upper Stiffener Hardware 9 Lower Stiffener Hardware 10 Discarded Concrete Anchor 11 Discarded Concrete 14 Floor Concrete 17 Fixing Nut 51 Steel Column 53 Post-cast Concrete 55 Anchor mounting plate 56 Building anchor bolt 57 Form steel pipe 58 Foundation beam main bar 59 Anchor bar 71 Building anchor bolt 72 Steel column

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobufumi Yamamoto No. 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) Noriyori Tsushima 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Inventor Hiromichi Matsumura 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Inventor Shinhachi Sasaki 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Inside the Steel Pipe Co., Ltd. (72) Inventor Haruhito Okamoto 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Inside (72) Inventor Nobuyuki Nakamura 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Within the corporation

Claims (1)

[Claims] 1. A stiffener hardware made of thick steel plate in which arms are orthogonal to each other, and an end portion is fitted into a bolt hole provided at a tip portion of the arm member in a box-out embedded type concrete for fixing steel columns of a building. A steel column post comprising a combined anchor bar and a nut screwed into a screw groove provided at an end of the anchor bar.