JPH05195541A - Steel-framed column base - Google Patents

Abstract

PURPOSE:To prevent the occurrence of dents from the inside of a steel tubular column as well as prevent buckling by strongly fixing the column of steel-framed column base with the column legs. CONSTITUTION:A steel-framed column 1 is inserted into the space between the formwork 2 and the inside formwork 4 in a double box-shaped formwork for a box-shaped buried column base, and a material having high rigidity is packed into the inside formwork 4. The column-burying length in the fitting part of the steel-framed column base can thus be shortened, and high resistance against repeating load can also be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is devised so that a portion of a steel frame building or the like called a column base is attached to a concrete foundation beam so that the column base is not broken by the force applied to the column. The present invention relates to steel column pedestals such as steel structures.

In particular, the present invention is a steel frame construction such as a strong building which can avoid a phenomenon called buckling in which a column locally snaps near the portion where the connection with the foundation is subjected to the most severe load. The present invention relates to steel column bases for objects.

[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 formwork are connected by welding or the like so as to directly transmit the force applied to the column to the foundation beam through 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, the technique proposed in Japanese Patent Laid-Open No. 63-165626 has the following problems. That is, since the degree of fixation is insufficient, it is necessary to increase the embedding length, and further, the yield strength is low and it is weak against repeated load.

Further, the conventional work before the work proposed in Japanese Patent Application Laid-Open No. 63-165626, which uses a square steel pipe or the like as the box-out form, is required for the moment of the column as shown in FIG. The anchoring bolt for erection 8
Since it is a structure to be borne by only one, it is necessary to use a thick bolt having a long embedding length for the erection anchor bolt 81 because the fixing degree is insufficient, and the steel column 82
It was necessary to make the second moment of area extremely large.

[0008]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and the column base fitting portion of the column of the box-embedded embedded column base is further strongly fixed and fixed to the column base. It is an object of the present invention to provide a steel column base having a boxed form made of a steel material with ribs, which has a high degree of strength and proof strength, may have a short embedded length, and can maintain high performance even under repeated loads.

[0009]

A steel column post according to the present invention is a box-embedded embedded column base, and in the box-embedded embedded column base, a tubular outer frame fixed to a base plate and fixed to the base plate. A tubular inner mold, and a tubular column inserted between the outer mold and the inner mold, the middle part of the three members is fixed with a filler made of high-strength mortar grout, Characterized by forming a double box-out formwork, wherein the inner formwork is made of a solid and highly rigid material and is inserted into the tubular column to prevent buckling of the tubular column from the inside. Further, the lower end surface of the column fitted between the outer mold and the inner mold is covered with a ribbed steel plate and covered with the ribbed steel plate.

[0010]

The steel column base having the box-out form constructed as described above forms a double rectangular box-out form in which the lower end of the column is fitted between the outer form and the inner form. As a result, the column base fitting portion of the column is strongly fixed to the column base to have a high degree of fixation and proof strength, the embedded length may be shortened, and high performance can be maintained against repeated loads. Further, the inner mold is made of a solid and high-rigidity material, and is inserted inside the tubular column to support and prevent the buckling of the tubular column from the inside.

[0011]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a double prismatic box-out frame type column base according to one embodiment of the present invention. FIG. 2 is a perspective view of a double prismatic box-out frame type column base which is the same invention as in FIG. In FIG. 1 and FIG. 2, 1 is a steel column. 2 is a formwork. Three
Is a filler composed of high strength mortar grout. Reference numeral 4 is an inner frame. 5 is an anchor mounting plate. 6 is an anchor bolt for erection. Reference numeral 7 is a foundation beam. 8 is a form base plate. 9 is an anchor frame.
10 is a discarded concrete anchor. 11 is waste concrete. Reference numeral 13 is a main beam of the foundation beam.

Next, a method of constructing the double prismatic box-out frame-type column base in the case of the above configuration will be described. First, the discarded concrete anchor 10 is arranged and the discarded concrete 11 is placed. Then, the anchor frame 9 is discarded and fixed to the concrete anchor 10 by welding or bolting. Next, the inner frame 4 and the frame 2 fixed to the frame base plate 8 by welding or the like is manufactured with high precision in a factory and is carried into the construction site. Next, the inner frame 4 and the frame 2 welded to the frame base plate 8 are fixed to the anchor frame 9 by welding or bolting. Although the inner frame 4 is made of a square steel pipe made of steel plate, it is more preferable to use a checker plate, and it is also possible to use expanded metal. The erection anchor bolt 6 is usually welded to the formwork 2 in advance at a factory.

Next, the foundation beam main bars 13 and the like are installed to form the form of the foundation beam 7, and concrete is poured. Form 2 at this time
The inside of is made hollow without placing concrete.
The anchor mounting plate 5 is fixed to the steel column 1 by welding or the like. It is usually installed at the factory with high precision and then brought to the construction site. The steel frame pillar 1 to which the anchor mounting plate 5 is mounted is mounted to the erection anchor bolt 6 via the anchor mounting plate 5. After this, a filler 3 made of high-strength mortar grout is placed in the mold 2 and the inner frame 4. After this, if necessary, floor concrete 1
4 is cast. According to the double prismatic box-out frame type column base having the above-mentioned structure, the inner and outer surfaces of the column base fitting portion of the column are firmly fixed to the column base, and the degree of fixing and the yield strength are high. ,
High performance can be maintained even under repeated load.

FIG. 3 is a vertical sectional view of a double prismatic box-out frame type column base which is another embodiment of the present invention. In the figure 1,
2, 3, 5, 6, 7, 8, 9, 10 and 11 are the same as above. 41 is a core prism made of high-strength reinforced concrete.

Next, a method for constructing the double prismatic box-out frame-type column base having the above-described structure according to the second aspect of the present invention will be described. Construction of the discarded concrete anchor 10, the discarded concrete 11, the anchor frame 9, and the concrete anchor 10 is as described above. Next, the mold base plate 8 to which the core prism 41 and the mold 2 are fixed is manufactured in a factory with high accuracy, and is carried into the construction site. Then, the mold base plate 8 to which the core prism 4 and the mold 2 are attached is fixed to the anchor frame 9 by welding or bolting. The core prism 41 is normally made of high-strength reinforced concrete, but since it is provided to prevent the phenomenon called buckling, where the steel frame column 1 bends sharply near the column pedestal, if it is hard to dent and has high rigidity, other than the above It doesn't matter even if it is a structure. The construction of the erection anchor bolt 6, the foundation beam main reinforcement 13, etc., and the foundation beam 7 is as described above. At this time, the inside of the formwork 2 is made hollow without placing concrete.

The anchor mounting plate 5 is fixed to the steel column 1 by welding or the like. The steel column 1 is attached to the erection anchor bolt 6 via the anchor attachment plate 5. After this, a filler 3 made of high-strength mortar grout is placed in the mold 2. Further, after this, floor concrete 14 is poured in some cases. In the column base described in claim 2 having the above-mentioned structure, since the inner surface of the column base fitting portion of the column is filled with a highly rigid structure which is hard to be dented, the steel column 1 is close to the column base. It is possible to prevent a phenomenon called "buckling and buckling", and the steel column 1 is firmly fixed to the column base to have a high degree of fixation and proof stress, and it is possible to maintain high performance even under repeated load.

FIG. 4 is a vertical sectional view of a double prismatic box-out frame type column base according to still another embodiment of the present invention. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11 are the same as in FIG. 13 is a steel plate with ribs. 42 is a rib. The ribbed steel plates 13 are welded to the four outer surfaces of the steel column 1.

FIG. 5 is a perspective view showing details of the steel frame column 1 of the double prismatic box-out frame type column base, which is still another embodiment of the present invention similar to FIG. In the figure, 1 is a steel column.
13 is a steel plate with ribs. 42 is a rib. The steel column 1 is made of square steel pipe. The steel plate 13 with ribs is firmly attached to the surface portion embedded in the high-strength mortar grout filler 3 below the steel column 1 by welding or the like.

Next, a method of constructing the double prismatic box-out frame-type column base having the above-mentioned structure according to the third aspect of the present invention will be described. Construction of the discarded concrete anchor 10, the discarded concrete 11, the anchor frame 9, and the concrete anchor 10 is as described above. Next, a mold base plate 8 to which the inner formwork 4 and the formwork 2 are fixed is manufactured with high precision in a factory, and is carried into a construction site. Then, the inner formwork 4 and the formwork 2 are attached to the formwork base plate 8. Fixing the attached one to the anchor frame 9 by welding or bolting is as described above. The steel frame pillar 1 to which the anchor mounting plate 5 is mounted is mounted to the erection anchor bolt 6 via the anchor mounting plate 5. After this, a filler 3 made of high-strength mortar grout is placed in the mold 2 and the inner frame 4. Further, after this, floor concrete 14 is poured in some cases.

According to the third aspect of the present invention having the above-mentioned structure, the double prismatic box-out frame type column base has the ribbed steel plate 13 attached to the outer surface of the column base fitting portion of the column. The column base fitting part is firmly fixed to the column base to have a high degree of fixation and proof stress, and high performance can be maintained even under repeated load.

[0021]

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 column base according to an embodiment of the present invention.

2 is a perspective view of the column base of FIG. 1. FIG.

FIG. 3 is a vertical cross-sectional view of a column base which is another embodiment of the present invention.

FIG. 4 is a vertical sectional view of a column base which is still another embodiment of the present invention.

5 is a perspective view showing details of a steel column of the column base of FIG. 4; FIG.

FIG. 6 is a vertical cross-sectional view for explaining a conventional column base.

FIG. 7 is a plan view illustrating a conventional column base.

FIG. 8 is a vertical cross-sectional view illustrating a column base of another conventional technique.

[Explanation of symbols]

 1 Steel Column 2 Formwork 3 Filler 4 Inner Frame 5 Anchor Mounting Plate 6 Building Anchor Bolt 7 Foundation Beam 8 Formwork Base Plate 9 Anchor Frame 10 Discarded Concrete Anchor 11 Discarded Concrete 13 Foundation Beam Main Bar 14 Floor Concrete 41 Core Square Column 42 ribs 61 steel column 63 filler 65 post-cast concrete 66 anchor mounting plate 67 formwork steel pipe 68 foundation beam main bar 69 anchor bar 81 erection anchor bolt 82 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 (3)

[Claims] 1. In a box-out embedded pedestal, a tubular outer form fixed to a base plate, a tubular inner form fixed to a base plate, and inserted between the outer form and the inner form. And a tubular column formed by fixing the middle part of the three members with a filler made of high-strength mortar grout to form a double box-out frame. 2. The inner formwork is made of a solid and highly rigid material, and is inserted into the inside of the tubular column to support the buckling of the tubular column from the inside. Steel column base. 3. The steel frame according to claim 1, wherein the lower end surface of the pillar fitted between the outer mold and the inner mold is fixed with a ribbed steel plate and covered with the ribbed steel plate. Column base.