JPH05195539A - Steel-framed column base - Google Patents

Abstract

PURPOSE:To raise the strength of a steel-framed column base by a method in which in constructing a steel-framed column base of box-shaped buried column legs, the box-shaped frame or steel-framed column is formed of a steel plate with ribs. CONSTITUTION:An anchor frame 9 is fixed to leveling concrete anchors 10 buried in a leveling concrete 11, and anchor belts 6 and a formwork base plate 8 are fixed to a formwork 2 of an angular tube form made of a steel plate with ribs 4. The plate 8 is fixed to the frame 9, and concrete for base beam 7 is placed. A steel-framed column 1 with fitting plate 5 is fitted into the formwork 2, the plate 5 is attached to the bolts 6, and a high-strength mortar- based filler 3 is placed into the formwork 2. The formwork 2 may be formed of steel plates with ribs on both sides or the column 1 may be attached with steel plates with ribs or formed of steel plates with ribs. Repeating load resistance including fixing durability can thus be raised and maintained, and the burying length can also be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the proof strength of a steel column base in order to transmit the full plastic moment of the column to the foundation beam in the fixed part of the steel column base of a steel structure such as a building. The present invention relates to a box-type embedded pedestal.

In particular, the present invention is a steel frame that is designed so that a portion for attaching a column of a steel frame building called a column base to a concrete foundation beam is strong and the column base portion is not broken by the force applied to the column. The present invention relates to a steel column base for a building or the like.

[0003]

2. Description of the Related Art In the prior art, the structure of a box-embedded embedded column base is as disclosed in Japanese Patent Laid-Open No. 165626/1988, and a rectangular steel pipe or the like is used as a box-molded form. The main bar or anchor bar of the foundation beam and the square steel pipe of the form are connected by welding or the like so that the total plastic moment of the steel column, etc. can be directly transmitted to the foundation beam via the steel pipe or the like.

FIG. 6 is a vertical sectional view for explaining the above-mentioned proposed technique. FIG. 7 is a plan view for explaining the above proposed technique. In FIGS. 6 and 7, 61 is a steel frame column. 63
Is a post-cast concrete consisting of a filler. Reference numeral 65 is an anchor mounting plate. 66 is an anchor bolt for erection. 67 is a form steel pipe. Reference numeral 68 is a main beam of the foundation beam.
69 is an anchor muscle. When the steel frame column 61 is built, the steel frame column 61 is temporarily fixed to the erection anchor bolt 66 via the anchor mounting plate 65 welded to the steel frame column 61. Since the erection anchor bolt 66 is welded to the form steel pipe 67, the steel column 61 is temporarily fixed to the foundation beam through this.

Next, a construction method based on the above configuration will be described. The main beam 68 of the foundation beam, the anchor bar 69 and the stirrup are arranged in the formwork for forming the base beam, and the box-out formwork made of the formwork steel pipe 67 is arranged at the position where the column base is embedded. The main beam is completed by connecting the beam main bars 68 by welding or by arranging U-shaped bars so as to surround the outer circumference of the form steel pipe 67 and placing concrete. Next, after the foundation beam is completed, the steel pillars 61 are temporarily fixed to the erection anchor bolts 66 by the erection anchor bolts 66 via the anchor attachment plates 65. After this temporary fixing work, that is, after erection, a post-cast concrete 63 made of a filler having a strength higher than that of the concrete for the foundation beam is placed in the space of the form steel pipe 67. In the technique of this proposal, since the steel column 61 is shortly embedded, the joining anchoring force of the required moment of the column is supplemented by the erection anchor bolt 66.

However, JP-A-63-165626
The technology proposed in the publication has the following problems. That is, since the degree of fixation is insufficient, it is necessary to lengthen the embedding length,
Further, there is a problem that the yield strength is low and it is weak against repeated load.

Further, as proposed in Japanese Unexamined Patent Publication No. 63-165626, the conventional work before the work using a square steel pipe or the like as a box-out form is required as shown in FIG. Since the joint bearing strength of the moment is borne only by the erection anchor bolt 81, it is necessary to use a thick bolt with a long embedding length for the erection anchor bolt 81 because the fixing degree is insufficient. The second moment of area of the column 82 also needed to be extremely large.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the column base fitting portion of the main column of the box-embedded embedded column leg portion is more firmly fixed to the column base. It is an object of the present invention to provide a steel column base having a box-making form made of a ribbed steel material that has a high degree of fixation and proof strength, may have a shorter embedded length, and can maintain high performance even under repeated loads. To do.

[0009]

Means for Solving the Problems The steel column base according to the present invention is a box-embedded embedded column base formed by a steel plate with one-sided ribs or a steel plate with both-sided ribs into a tubular shape having ribs on the inner surface or inner and outer surfaces. It is characterized in that it is provided with a box-out frame, and is characterized in that it is formed by fixing a steel plate with ribs to the column base fitting portion of a column having an enclosed cross section, and further, the column base with the box-out die. The fitting portion is formed of a steel plate with an outer rib.

[0010]

In the steel column base having the box-out form made of ribbed steel constructed as described above, the filler made of high-strength non-shrink mortar filled in the form is surrounded by the ribbed steel. Therefore, the stress can be transmitted to the foundation beam in the ground through the formwork.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a steel frame column base having a boxed mold made of ribbed steel according to the present invention will be described in detail with reference to the drawings attached to each claim. FIG. 1 is an explanatory view of a vertical section of a steel column base having a boxed mold made of a ribbed steel material according to claim 1.

In the figure, 1 is a steel frame column. Reference numeral 2 is a mold frame formed in a rectangular steel pipe. 3 is a filler, which is made of high strength non-shrink mortar. Reference numeral 4 is a rib of a steel plate with ribs. The shape of the rib is a checker shape, but may be a stripe shape. 5 is an anchor mounting plate. 6 is an anchor bolt for erection. Reference numeral 7 is a foundation beam. Reference numeral 8 is a form steel pipe base plate. 9 is an anchor frame.
10 is a discarded concrete anchor. 11 is waste concrete.

The method of constructing the steel column base of FIG. 1 is as follows.
First, the discarded concrete 11 is placed together with the discarded concrete anchor 10. The anchor frame 9 is then discarded and fixed to the concrete anchor 10 by welding or bolting. Next, the mold anchor 2 for which the erection anchor bolt 6 and the mold base plate 8 have been welded in advance in the manufacturing factory are fixed to the anchor frame 9 by welding or bolting. Next, the concrete of the foundation beam 7 is poured.
Next, the anchor mounting plate 5 is fitted with the steel frame column 1 which has been welded in advance in the manufacturing factory. Next, the anchor mounting plate 5 is fastened to the erection anchor bolt 6 with a nut. Next, inside the mold 2, a filler 3 mainly composed of high-strength mortar
To place. Since the filler 3 and the mold 2 are strongly fixed to each other by the ribs 4 of the ribbed steel plate, a steel column base with a high degree of fixation and high yield strength can be obtained. When the formwork 2 is made of a steel plate with ribs on both sides, the base beam 7 and the formwork 2 are further strongly fixed by the ribs 4 of the ribbed steel plate, so that the degree of fixing and the yield strength are improved. Furthermore, the floor concrete 14 may then be placed.

FIG. 2 is a perspective view showing a state in which the concrete of the foundation beam 7 is being poured. 7 is a foundation beam in the middle of pouring concrete. 13 is an anchor rebar.

FIG. 3 is an explanatory view of a vertical cross section of the steel column base when the ribbed steel plate according to claim 3 is fixed to the outer surface of the column of the column base fitting portion. In the figure, reference numeral 1 denotes a steel column, which forms a column. Reference numeral 31 denotes a steel plate with ribs around the steel column 1.
It is fixed to the surface by welding or bolting. Figure 3
The construction method of the steel column base is as described above. Filler 3 here
Since the steel frame column 1 is strongly fixed by the ribs 4 of the ribbed steel plate through the ribbed steel plate 31, a steel column column having a high degree of fixation and high yield strength can be obtained. Further then floor concrete 1
In some cases, 4 is set.

FIG. 4 is an explanatory view of a vertical cross section of a steel column base having a column in which the column base fitting portion according to claim 4 is formed of a steel plate with outer ribs. The method of constructing the steel column base of FIG. 4 is as described above. In the present invention, the column base fitting portion of the main column is formed of the steel plate with ribs on the outer surface, and the filler 3 and the steel frame column 1 are strongly fixed to each other by the ribs 4 of the ribbed steel plate. A high steel column base can be obtained. Figure 5
FIG. 3 is a perspective view showing the shape of a main pillar in the present invention. The joint between the ribbed steel plate and the flat steel plate is strongly fixed by welding or bolting. Furthermore, the floor concrete 14 may then be placed.

It is also possible to apply the main column having the shape shown in FIG. 5 to the steel column base having the box-making form made of the ribbed steel material shown in FIG. The improving effect works synergistically.

[0018]

According to the present invention, since the column base fitting portion of the main column is firmly fixed to the column base, a steel column column base having a high degree of fixation and a high yield strength can be obtained, and the embedding length can be made relatively short. It is possible to maintain high performance even under repeated load.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a steel column base having a boxed mold made of ribbed steel according to the present invention.

FIG. 2 is a perspective view showing a state where concrete of the column base beam of the present invention is being poured.

FIG. 3 is an explanatory view of a vertical section of a steel column base having a main column in which the steel plate with ribs of the present invention is fixed to the outer surface of the column base fitting portion.

FIG. 4 is a vertical cross-sectional view of a steel column base having a main column in which the column base fitting portion of the present invention is formed of a steel plate with external ribs.

FIG. 5 is a perspective view showing the shape of a main pillar of the present invention.

FIG. 6 is a vertical cross-sectional view showing the shape of a main pillar of a conventional technique.

FIG. 7 is a plan view showing the shape of a main pillar of a conventional technique.

FIG. 8 is a vertical cross-sectional view showing the shape of a main pillar of a conventional technique.

[Explanation of symbols]

 1 Steel Column 2 Formwork 3 Filler 4 Rib 5 Anchor Mounting Plate 6 Building Anchor Bolt 7 Foundation Beam 8 Formwork Steel Pipe Baseplate 9 Anchor Frame 10 Discarded Concrete Anchor 11 Discarded Concrete 13 Anchor Rebar 14 Floor Concrete 31 Ribbed Steel Plate 61 Steel column 63 Post-cast concrete 65 Anchor mounting plate 66 Building anchor bolt 67 Formwork steel pipe 68 Foundation beam main bar 69 Anchor bar 81 Building anchor bolt 82 Steel frame 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 (3)

[Claims] 1. A box-out embedded pedestal comprising a box-out frame formed by a steel plate with one-sided ribs or a steel plate with both-sided ribs and having a rib on the inner or outer surface. Steel column base to be. 2. A box-type embedded column base, wherein a steel plate with ribs is fixed to a column base fitting portion of a column having an enclosed cross section. 3. The box-type embedded column base, wherein the column-base fitting part of the column with the box-type mold is formed of a steel plate with external ribs.