JP3650097B2 - Foundation for steel columns in buildings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the foundation of the steel columns of the building, such as buildings and condominiums.
[0002]
[Prior art]
FIG. 6 is a sectional view of a foundation of a steel column of a conventional building. 1 is a concrete foundation, which is formed by placing concrete in the ground. GL is the ground. A reinforcing bar 2 is arranged in the concrete foundation 1.
[0003]
An H-shaped steel 3 is disposed on the upper surface of the concrete foundation 1. A lower member (lower flange) 3 a of the H-shaped steel 3 is fixed on the concrete foundation 1 with bolts 4. Reference numeral 5 denotes a steel column (hereinafter referred to as “column”). The lower end 6 protruding in a flange shape is grounded on the horizontal upper member (upper flange) 3b of the H-shaped steel 3, and the lower end 6 and the upper member 3b are grounded. Are connected by bolts 7 and nuts 8 and are erected on the H-shaped steel 3. Column 5 is a pillar of a building such as a building or a condominium.
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned conventional basic structure, the column 5 has its lower end 6 connected to the upper member 3b of the H-shaped steel 3 by bolts 7 and nuts 8, thereby supporting and fixing the column 5. The strength of the connecting portion of the upper member 3b is weak, and in the event of an earthquake or the like, especially when an external force in the horizontal direction is applied, the bolt 7 and the flange 6 are easily broken and broken.
[0005]
Accordingly, the present invention aims at providing a basis for steel columns of buildings steel columns (the column) can be firmly supported.
[0008]
[Means for Solving the Problems]
The foundation of the steel column of the building of the present invention is a horizontal steel frame, a first steel column that is erected and connected to an end of the horizontal steel frame, and a first steel column that is erected on the horizontal steel frame. A steel column foundation of a building comprising two steel columns, wherein a lower end portion of the first steel column extends to a position below the horizontal steel frame and extends laterally to the lower end portion the member for binding to said horizontal steel the lower end of the first steel columns and the second steel columns were set embedded in the concrete foundation.
[0009]
According to the present invention, the horizontal steel and the first steel column (column) and the lower end of the second steel column are embedded in the concrete foundation, so that the column can be supported firmly, especially during an earthquake. It is possible to sufficiently counter the external force in the horizontal direction.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
FIG. 1 is a perspective view of a column and H-shaped steel in Embodiment 1 of the present invention, and FIG. 2 is a sectional view of the foundation of a steel column of the same building.
[0011]
In FIG. 1, a column 10 is a hollow quadrangular column, and a plate-like extending member 11 protruding in the horizontal direction is coupled to the lower end portion thereof by welding means or the like. A plurality of holes 12 are formed in the extending member 11. The H-shaped steel 13 as a steel frame is composed of a lower member (lower flange) 13a, an upper member (upper flange) 13b, and an intermediate member 13c. A plurality of holes 14 and 15 are formed in the lower member 13a and the upper member 13b. ing.
[0012]
The extending member 11 is installed on the upper member 13 b with the hole portion 12 aligned with the hole portion 15, the bolt 16 is inserted into the hole portions 12, 15, and the nut 17 is screwed from the lower end portion of the bolt 16. Thus, the extending member 11 and the upper member 13b are coupled. That is, the bolt 16 and the nut 17 serve as a coupling means for the column 10 and the H-shaped steel 13. As the coupling means, welding means or the like can also be applied. A rod-shaped anchor 18 is vertically inserted into the hole 14 of the lower member 13a.
[0013]
FIG. 2 shows a foundation constructed by standing the column 10 on the H-shaped steel 13. In this foundation, the H-shaped steel 13 is horizontally arranged in the ground, the anchor 18 is inserted and attached to the hole 14 of the lower member 13a, and the column 10 is erected on the upper member 13b as described above. The extending member 11 and the upper member 13 b are coupled by a bolt 16 and a nut 17. Then, the reinforcing bars 20 are arranged in the ground, and the concrete foundation 21 is constructed by placing concrete in an area including the steel frame 13, the lower end of the column 10, the anchors 18, and the reinforcing bars 20.
[0014]
In FIG. 2, since the lower end of the column 10 is embedded in the concrete foundation 21 together with the H-shaped steel 13 and the anchor 18, the coupling strength between the extending member 11 and the upper member 13b is extremely high, and an external force such as an earthquake acts. Even so, the column 10 is maintained in a strong support state.
[0015]
(Embodiment 2)
FIG. 3 is a cross-sectional view of the foundation of a steel column of a building according to Embodiment 2 of the present invention. The steel frame 25 according to the second embodiment is formed by connecting a lower member (lower flange) 27 and an upper member (upper flange) 28 to a hollow rectangular column 26. In the second embodiment, the lower member 27 and the upper member 28 are coupled to the lower surface and the upper surface of the hollow rectangular column 26 by welding, but may be coupled by a coupling means such as a bolt or a nut.
[0016]
The anchor 18 is vertically inserted and attached to the hole 29 of the lower member 27. Further, the column 10 is erected on the upper member 28, and both are coupled by bolts 16, nuts 17 and the like as in the first embodiment. Other configurations other than the above are the same as those in the first embodiment. Also in the second embodiment, since the lower end portion of the column 10, the steel frame 25, the anchor 18 and the like are embedded in the concrete foundation 21, the coupling strength between the lower end portion of the column 10 and the upper member 28 is extremely high, and an earthquake, etc. Even if an external force is applied, the column 10 is maintained in a strong support state.
[0017]
(Embodiment 3)
FIG. 4 is a perspective view of a steel structure built in a concrete foundation according to Embodiment 3 of the present invention, and FIG. 5 is a cross-sectional view of the foundation of the steel column of the structure.
[0018]
Reference numeral 30 denotes a horizontal steel frame made of H-shaped steel, and a first column 31 is erected vertically at an end portion thereof. The first column 31 is a hollow rectangular column, and is coupled to the end of the horizontal steel frame 30 by bolts, nuts, welding means, or the like. The lower end portion of the first column 31 extends to the lower side of the horizontal steel frame 30, and a plate-like member 32 made of an iron plate or the like and extending sideways is coupled to the lower end portion by welding means or the like. ing. The member 32 extends in a flange shape to the side of the first column 31, and a plurality of holes 33 are opened in the extended portion. An anchor 34 is inserted vertically into each hole 33.
[0019]
A second column 35 is erected vertically on the upper surface of the intermediate portion of the horizontal steel frame 30. The second column 35 is also a hollow quadrangular column, and a flange 36 is coupled to the lower end portion thereof. The flange 36 is coupled to the horizontal steel frame 30 by coupling means such as bolts 37 and nuts 38 or welding means. A reinforcing member 39 made of an iron plate or the like is provided between an upper member and a lower member of the horizontal steel frame 30 immediately below the second column 35. Reference numeral 40 denotes a triangular plate-like reinforcing member, which is coupled to the side surfaces of the first column 31 and the second column 35 and the upper surface of the horizontal steel frame 30 by a coupling means such as a welding joint or a bolt and nut.
[0020]
As shown in FIG. 5, since the horizontal steel frame 30 and the lower ends of the first column 31 and the second column 35, the anchor 34, etc. are embedded in the concrete foundation 41, even against an external force such as an earthquake, Sufficient strength and a supporting state of the columns 31 and 35 can be secured. In FIG. 5, the reinforcing bars in the concrete foundation 41 are omitted.
[0021]
【The invention's effect】
As described above, according to the present invention, the horizontal steel frame and the first steel column (column) and the lower end of the second steel column are embedded in the concrete foundation, so that the column is firmly supported. In particular, it can sufficiently resist the external force in the horizontal direction during an earthquake. Moreover, the steel column can be more firmly fixed by providing the anchor.
[Brief description of the drawings]
FIG. 1 is a perspective view of a column and an H-shaped steel in Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the foundation of a steel column of a building in Embodiment 1 of the present invention. FIG. 4 is a perspective view of a steel structure built in a concrete foundation according to a third embodiment of the present invention. FIG. 5 is a construction according to a third embodiment of the present invention. Sectional view of the foundation of a steel column of the object [Fig. 6] Sectional view of the foundation of the steel column of a conventional building [Explanation of symbols]
10 Column (steel column)
11 Extension members 13, 25 Steel frame (H-shaped steel)
13a, 27 Lower member 13b, 28 Upper member 18, 34 Anchor 21, 41 Concrete foundation 30 Horizontal steel frame 31 First column 32 Member 35 extending sideways Second column

Claims (2)

A steel frame of a building comprising a horizontal steel frame, a first steel column erected and coupled to an end of the horizontal steel frame, and a second steel column erected on the horizontal steel frame A first steel column that is a foundation of a column , wherein a lower end portion of the first steel column is extended to below the horizontal steel frame, and a member that extends laterally is coupled to the lower end portion; And the lower end part of the said 2nd steel column and the said horizontal steel frame were embed | buried in a concrete foundation, The foundation of the steel column of the structure characterized by the above-mentioned. Basis for steel column of claim 1 building, wherein the provision of the anchor to be embedded is attached to a member extending into the side towards in the concrete foundation.

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