JP2022139732A - Column base reinforcement structure and column base reinforcement method of existing building - Google Patents

Abstract

To provide a column base reinforcement structure and a column base reinforcement method of an existing building allowing an exposed part of a floor slab concrete at a column base part of a square steel pipe column of the existing building to be easily and adequately reinforced.SOLUTION: A column base reinforcement structure is provided with reinforced buckling bearing plates 3 for bearing buckling toward a direction of outersurface sides of surface parts of a column base part 11 of a square steel pipe column 1, arranged on each of the surface parts with gaps G to each of the surface parts in a state of facing each other. Adjacent buckling bearing plates 3 and 3 are connected to each other at a corner side of an intersection of adjacent surface parts of the square steel pipe column 1.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedestal reinforcing structure capable of suppressing buckling at a pedestal portion of a square steel pipe column of a building and a pedestal reinforcing method for an existing building.

Patent Document 1 discloses a steel frame that constitutes a neck wrap provided to cover the lower part of a steel column erected on a slab of a building, a bottom plate attached to the slab surrounding the steel column, and A cylindrical side plate that is attached to the bottom plate and forms a concrete placing space around the lower part of the steel frame column, and a connecting member that is arranged in the concrete placing space and connects the side plate and the steel frame column. A structure is disclosed comprising:

Further, Patent Document 2 discloses a steel pipe column having upper and lower steel pipe joints to which horizontal members are joined, a steel pipe main body portion extending between the steel pipe joints, and a filler filled in the steel pipe column. concrete; and a buckling suppression member provided on a side wall of the axial end of the steel pipe main body to suppress outward displacement of the side wall in the out-of-plane direction, the buckling suppression member A fireproof reinforcing structure of a concrete-filled steel pipe column opposed to a side wall at an axial end of a steel pipe main body with a gap is disclosed.

JP 2016-216993 A JP 2013-87520 A

However, the reinforcing structure for the column base according to Patent Document 1 is produced by a wet construction method that requires adjustment of the timing of placing concrete and a curing period, so there is a drawback that rapid reinforcement construction cannot be performed.

In addition, although the reinforcing structure of the column base according to Patent Document 2 above does not require timing adjustment of concrete placement and curing period, it is a structure suitable for reinforcement by post-construction construction of the column base of the steel pipe column of the existing building. I can't say In particular, since the substantially U-shaped or substantially L-shaped buckling restraining member is likely to be bulky, transportation of the buckling restraining member to the construction site becomes inefficient. In addition, in the buckling suppressing member having a substantially U-shape or the like as described above, when unevenness (unevenness) exists on the upper surface of the floor slab concrete, even if one surface of the buckling suppressing member can be made vertical, other The surface of the steel pipe column may become oblique with respect to the vertical direction, and the gap between the surface portions of the steel pipe column may not have a constant width in the vertical direction. In order to avoid this, if the unevenness is removed from the floor slab concrete, there is a possibility that the construction work will be increased and the construction cost will be relatively high. In addition, there is also a demand to avoid work involving welding in reinforcement work as much as possible.

The present invention provides a column base reinforcement structure and a column base reinforcement method for an existing building that makes it possible to easily and appropriately reinforce even the exposed portion on the floor slab concrete in the column base of a square steel pipe column of an existing building. I will provide a.

In the column base reinforcing structure of the present invention, a buckling receiving reinforcing plate for receiving buckling of the surface portion to the outside in the out-of-plane direction is formed on each surface portion of the column base portion of the square steel pipe column, forming a gap with respect to the surface portion. adjacent buckling-receiving reinforcing plates are connected to each other at the corner side where the adjacent face portions of the square steel pipe columns intersect.

With the above configuration, the buckling-receiving reinforcing plate can be made flat rather than U-shaped, so that the buckling-receiving reinforcing plate can be efficiently transported to the work site. In addition, if it is possible to form a flat plate in this way, it is easier to adjust the gap between the buckling-receiving reinforcing plates for each surface compared to a shape such as a U-shape. It becomes possible to easily and appropriately reinforce even an exposed portion having an uneven surface on concrete.

A two-side member having two plate portions positioned in a mountain shape is arranged with the two plate portions in contact with the surface portion near the corner portion of the square steel pipe column, and the plate portion is interposed between the two side members. The buckling-receiving reinforcing plate may face the surface portion, and a gap due to the thickness of the plate portion may be formed between the buckling-receiving reinforcing plate and the surface portion of the square steel pipe column. According to this, it is possible to easily form a constant gap between the buckling-receiving reinforcing plate and the face portion of the rectangular steel pipe column by the thickness of the plate portion of the two-side member. Further, the corners of the square steel pipe columns can be reinforced by the two-sided members.

Alternatively, adjacent buckling-receiving reinforcing plates are connected by a hinge in which two plate portions are rotatably connected, and the hinge is attached to the surface portion near the corner portion of the square steel pipe column. The buckling-receiving reinforcing plate faces the surface portion via the plate portion, and the plate is located between the buckling-receiving reinforcing plate and the surface portion of the square steel pipe column A gap may be formed by the thickness of the part. According to this, it is possible to easily form a constant gap between the buckling-receiving reinforcing plate and the surface portion of the square steel pipe column by the thickness of the plate portion of the hinge. Further, the corners of the square steel pipe columns can be reinforced by the hinges. Moreover, since the two buckling-receiving reinforcing plates connected by the hinge are provided as a set, the efficiency of assembling the buckling-receiving reinforcing plates to the rectangular steel pipe columns is improved. On the other hand, since two buckling-receiving reinforcing plates adjacent to each other can be folded and stacked on top of each other, the buckling-receiving reinforcing plates can be efficiently transported to the work site.

The buckling reinforcement plate may be a precast concrete slab. Thus, if the buckling-receiving reinforcing plate is a precast concrete slab, it is possible to reinforce the column base using concrete while avoiding the drawbacks of the wet construction method.

The precast concrete slab, which is the buckling-receiving reinforcing plate, may have a steel plate on the side facing the face portion of the square steel pipe column. According to this, the buckling-receiving reinforcing plate can be made stronger by the steel plate to reinforce the column base.

All or part of the adjacent buckling reinforcement plates may be connected to each other via a connection member disposed between the side surfaces of these buckling reinforcement plates. According to this, the rectangular steel pipe column can be easily and reliably surrounded by the buckling-receiving reinforcing plate using the connecting member.

All or part of the adjacent buckling-receiving reinforcing plates are arranged so that the side surface of one buckling-receiving reinforcing plate faces the edge of the surface of the other buckling-receiving reinforcing plate facing the rectangular steel pipe column. may be interconnected. According to this, the use of the connecting member can be eliminated or reduced.

Further, in the method for reinforcing the column base of an existing building according to the present invention, each surface portion of the exposed portion on the floor slab concrete in the column base portion of the square steel pipe column of the existing building receives the buckling of the surface portion to the outside in the out-of-plane direction. The buckling reinforcement plates are arranged facing each other with a gap formed between them, and the adjacent buckling reinforcement plates are connected to each other at the corners where the adjacent surfaces of the square steel pipe columns intersect. characterized by

According to the above method, the buckling reinforcement plate can be formed in a flat plate shape instead of a U-shape, so that the buckling reinforcement plate can be efficiently transported to the work site. Since it is easy to adjust the gap between the buckling-receiving reinforcing plates for each surface, it is possible to easily and appropriately reinforce the uneven exposed portions on the floor slab concrete at the base of the square steel pipe columns of existing buildings. be possible.

According to the present invention, the buckling reinforcement plate can be efficiently transported to the work site, and the exposed portion on the floor slab concrete at the column base of the square steel pipe column of the existing building can be easily removed. And it is effective in being able to reinforce appropriately.

It is the figure which showed the column base reinforcement structure of embodiment, Comprising: The figure (A) is a cross-sectional view, The figure (B) is a front view which also showed the inside of floor slab concrete. It is the figure which showed the column base reinforcement structure of Embodiment 2, Comprising: The same figure (A) is a cross-sectional view, The same figure (B) is a front view which also showed the inside of floor slab concrete. It is the figure which showed the modification of Embodiment 2, Comprising: The same figure (A) is a cross-sectional view, The same figure (B) is a front view which also showed the inside of floor slab concrete. It is the figure which showed the column base reinforcement structure of Embodiment 3, Comprising: The same figure (A) is a cross-sectional view, The same figure (B) is a front view which also showed the inside of floor slab concrete. It is a figure which showed the modification of Embodiment 3, Comprising: The same figure (A) is a cross-sectional view, The same figure (B) is a front view which also showed the inside of floor slab concrete. It is the figure which showed the other modified example of Embodiment 3, Comprising: The same figure (A) is a cross-sectional view, The same figure (B) is a front view which also showed the inside of floor slab concrete. It is the figure which showed the other modified example of Embodiment 3, Comprising: The same figure (A) is a cross-sectional view, The same figure (B) is a front view which also showed the inside of floor slab concrete. It is the figure which showed the other modified example of Embodiment 3, Comprising: The same figure (A) is a cross-sectional view, The same figure (B) is a front view which also showed the inside of floor slab concrete.

(Embodiment 1)
An embodiment according to one aspect of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the column base reinforcing structure of this embodiment reinforces the exposed portion on the floor slab concrete 2 in the column base portion 11 of the square steel pipe column 1 of the existing building. The floor slab concrete 2 covers the base plate 11a provided at the lower end of the square steel pipe column 1 and the lower portion of the column up to a predetermined height.

Further, in the column base reinforcement structure, flat plate-shaped buckling reinforcements are provided on each face portion (a total of four faces) of the column base portion 11 of the square steel pipe column 1 to receive buckling of each face portion outward in the out-of-plane direction. A plate 3 is arranged to face the surface with a gap G formed therebetween. Adjacent buckling-receiving reinforcing plates 3, 3 are connected to each other on the corner side where the adjacent faces of the square steel pipe column 1 intersect.

In this embodiment, the buckling-receiving reinforcing plate 3 is made of a precast concrete slab on which a plurality of reinforcing bars 31 are arranged vertically and horizontally. In addition, insert nuts are horizontally embedded at predetermined intervals in the height direction in the side surfaces (side surfaces) of the buckling receiving reinforcing plate 3 made of the precast concrete slab.

For example, the lateral length of the buckling receiving reinforcing plate 3 is the sum of the width of the square steel pipe column 1 and twice the length of the gap G, the height is about 1000 mm to 2000 mm, and the thickness is It is about 50 mm to 200 mm. Also, the gap G (on each side) is, for example, about 1 mm to 5 mm. In this buckling reinforcement plate 3, a steel plate having a thickness of about 2 mm to 6 mm may be attached to the surface of the precast concrete slab on the square steel pipe column 1 side.

A connecting member 4 is positioned between the side surfaces of the buckling-receiving reinforcing plates 3 adjacent to each other, and the connecting member 4 is fixed to the side surface by a fastening member 5 . That is, the adjacent buckling-receiving reinforcing plates 3 are connected to each other via the connecting member 4 . As an example, the connecting member 4 is made of a square steel pipe having a square cross section. In this square steel pipe, a plurality of bolt insertion holes are formed in an overpass manner to match the arrangement intervals of the insert nuts. A bolt as the fastening member 5 is passed through the bolt insertion hole and screwed to the insert nut. As a result, the four buckling-receiving reinforcing plates 3 are mutually pulled in the direction perpendicular to each other via the four connecting members 4 and fixed.

With such a column base reinforcing structure, the buckling-receiving reinforcing plate 3 can be formed in a flat plate shape instead of a U-shaped shape, so that the buckling-receiving reinforcing plate 3 can be efficiently transported to the work site. can be done. Further, when the buckling reinforcement plate 3 is flat in this way, it is sufficient to adjust the gap G of the buckling reinforcement plate 3 with respect to each surface of the square steel pipe column 1, and one buckling reinforcement can be achieved. Adjustment of the gap G between the plates 3 does not easily affect the adjustment of the gap G between the buckling-receiving reinforcing plates 3 adjacent thereto, so the adjustment of the gap G on each surface is facilitated. As a result, it becomes possible to easily and appropriately reinforce even the uneven exposed portion on the floor slab concrete 2 at the column base of the square steel pipe column 1 of the existing building.

If the buckling-receiving reinforcing plate 3 is a precast concrete slab, the column base can be reinforced using concrete while avoiding the drawbacks of the wet construction method.

If the precast concrete slab is provided with a steel plate facing the face side of the square steel pipe column 1, the buckling-receiving reinforcing plate 3 can be made stronger to reinforce the column base.

Since the adjacent buckling-receiving reinforcing plates 3 are connected to each other via the connecting member 4, the buckling-receiving reinforcing plate 3 can easily and reliably surround the rectangular steel pipe column 1 using the connecting member 4. be able to.

The connecting member 4 arranged at each corner of the square steel pipe column 1 may be a single piece having a length approximately equal to the height of the buckling-receiving reinforcing plate 3, or the buckling-receiving reinforcing plate 3 A plurality of objects having a length lower than the height may be spaced apart from each other.

(Embodiment 2)
FIG. 2 shows a column base reinforcing structure of another embodiment. In addition, the same code|symbol is attached to the member similar to the said Embodiment 1, and description is abbreviate|omitted.

In the column base reinforcing structure of this embodiment, equal-sided angle steels 6 as two-side members in which two plate portions 6a are positioned in a mountain shape are attached to the surface portions near the four corners of the square steel pipe column 1. , are placed in contact with the two plate portions 6a. Then, the buckling-receiving reinforcing plate 3 surrounds the rectangular steel pipe column 1 so as to face each face portion via the plate portion 6a, and between the buckling-receiving reinforcing plate 3 and the face portion of the rectangular steel pipe column 1, A gap G is formed by the thickness of the plate portion 6a. The length of the two-sided member (equilateral angle steel 6) is not limited to the same length as the height of the buckling receiving reinforcing plate 3.

Adjacent buckling reinforcement plates 3 are fixed to each other by fastening members 5 via connecting members 4A. The connecting member 4A is made of equilateral angle steel. A plurality of bolt insertion holes are formed in each plate portion of the equilateral angle steel at intervals matching the arrangement intervals of the insert nuts of the buckling receiving reinforcing plate 3 . A bolt as the fastening member 5 is passed through the bolt insertion hole and screwed to the insert nut. As a result, the four buckling-receiving reinforcing plates 3 are mutually attracted and fixed in the direction perpendicular to each other via the four connecting members 4A.

According to the above configuration, a constant gap G can be easily formed between the buckling-receiving reinforcing plate 3 and the surface portion of the square steel pipe column 1 by the thickness of the plate portion 6a of the equilateral angle steel 6. can be done. Further, since the equal-leg angle steel 6 is a general-purpose member, the material cost can be reduced. Further, the corners of the square steel pipe columns 1 can be reinforced by the equal-square angle steels 6 . In addition, the use of equilateral angle steel as the connection member 4A can reduce the amount of steel compared to the configuration using the connection member 4, which is a square steel pipe.

The lateral length of each buckling-receiving reinforcing plate 3 is not limited to the sum of the width of the square steel pipe column 1 and twice the length of the gap G. As shown in FIG. It can have a short horizontal length that does not reach 4A.

Further, in the second embodiment, the connecting member 4 may be used instead of the connecting member 4A. In addition, in Embodiment 1, it can replace with the connection member 4 and can use 4 A of connection members.

(Embodiment 3)
FIG. 4 shows a column base reinforcing structure of another embodiment. In addition, the same code|symbol is attached to the member similar to the said Embodiment 1, and description is abbreviate|omitted.

In the column base reinforcing structure of this embodiment, adjacent buckling receiving reinforcing plates 3 are connected by a hinge 7 to which two plate portions 7a are rotatably connected, and the hinge 7 is connected to the square steel pipe column 1. The two plate portions 7a are placed in contact with the surface portions in the vicinity of the corner portions of the . By applying two sets of two adjacent buckling-receiving reinforcing plates 3 connected by hinges 7 to each square steel pipe column 1, the buckling-receiving reinforcing plates 3 are connected via the plate portion 7a. 3 surrounds the rectangular steel pipe column 1 facing the face portion, and a gap G is formed between the buckling receiving reinforcing plate 3 and the face portion of the rectangular steel pipe column 1 by the thickness of the plate portion 7a.

When the buckling receiving reinforcing plate 3 is manufactured, the hinge 7 is temporarily fixed to the concrete portion using screws or the like, so that the hinge 7 can be fixed to the concrete when it hardens. Alternatively, if the buckling-receiving reinforcing plate 3 has the above-described steel plate, the buckling-receiving reinforcing plate 3 can be fixed to the steel plate with screws after it is manufactured. The hinge 7 may be a single piece having a length approximately equal to the height of the buckling reinforcement plate 3, or may have a length lower than the height of the buckling reinforcement plate 3 and spaced apart from each other. It is also possible to employ a configuration in which a plurality of wires are used.

Further, in this embodiment, the horizontal length of one buckling-receiving reinforcing plate 3 connected by the hinge 7 in one set is shorter than the horizontal length of the other buckling-receiving reinforcing plate 3, and this one set of square steel pipes The side surface position of the buckling receiving reinforcing plate 3 on one side is flush with the surface portion of the rectangular steel pipe column 1 when attached to the column 1 . Specifically, the lateral length of one (short side) buckling stiffening plate 3 is approximately the same as the width of the rectangular steel pipe column 1, and the lateral length of the other (long side) buckling stiffening plate 3 is , the width of the square steel pipe column 1, the double thickness of the buckling receiving reinforcing plate 3, and the double width of the gap G are added. Then, the above two sets applied to each square steel pipe column 1 are configured so that the side surface of one (short side) buckling support reinforcing plate 3 in one set is replaced with the other (long side) buckling support in another set. The reinforcing plates 3 are fixed to each other so as to face the edges of the faces of the reinforcing plates 3 facing the rectangular steel pipe columns. Thus, in the above example, two sets of two buckling reinforcement plates 3 connected by hinges 7 have the same configuration. Since these two sets can be fixed to each other without using the connecting member 4 or the like, the number of parts can be reduced.

As an example, insert nuts are provided on the edge side of the side of the buckling reinforcement plate 3 on one side (short side) facing the rectangular steel pipe column 1 and on the side surface of the buckling reinforcement plate 3 on the other side (long side). is embedded. A connecting plate 8 is arranged across the edge of the side of the buckling reinforcing plate 3 on the side facing the square steel pipe column 1 and the side surface of the other buckling reinforcing plate 3 . The connecting plate 8 is formed with bolt insertion holes at intervals corresponding to the arrangement positions of the insert nuts. By screwing the fastening member 5 (bolt) passed through the bolt insertion hole into the insert nut, one buckling-receiving reinforcing plate 3 in one set and the other buckling-receiving reinforcing plate 3 in another set are mutually connected. Fixed.

With the above configuration, a constant gap G can be easily formed between the buckling receiving reinforcing plate 3 and the face portion of the square steel pipe column 1 by the thickness of the plate portion 7a of the hinge 7. Further, the corners of the rectangular steel pipe columns 1 can be reinforced by the hinges 7 . In addition, since the two buckling reinforcement plates 3 connected by the hinge 7 are provided as a set, the efficiency of assembling the buckling reinforcement plates 3 to the rectangular steel pipe column 1 is improved. On the other hand, since two buckling-receiving reinforcing plates 3 adjacent to each other can be folded and stacked, the buckling-receiving reinforcing plates 3 can be efficiently transported to the work site.

The lateral length of the buckling reinforcement plate 3 on the one side (short side) may be shorter than the dimension shown in the figure, and this causes the square steel pipe of the buckling reinforcement plate 3 on the other side (long side). The gap G can also be adjusted by interposing a plate-like spacer in the gap formed between the side facing the pillar and the edge side. It is also possible to embed a double-ended bolt in the buckling receiving reinforcing plate 3 instead of the insert nut, and use a nut as a fastening member instead of the bolt.

Further, as shown in FIG. 5, a pipe 9A through which a fastening member (bolt) 5 can be inserted is embedded in the edge side of the buckling reinforcement plate 3 on the other side, and an insert is inserted into the side surface of the buckling reinforcement plate 3 on the one side. A configuration in which the nut 9B is embedded is also possible. With such a configuration, the fastening member 5 is passed through the pipe 9A and screwed into the insert nut 9B, thereby connecting the side surface of one buckling-receiving reinforcing plate 3 and the edge side of the other buckling-receiving reinforcing plate 3. The connection can be fixed.

In addition, as shown in FIG. 6, the lateral length of the buckling receiving reinforcing plate 3 on one side (short side) is shortened, and a two-sided member (equal-sided angle steel 6 or the like) is attached at the corner where the hinge 7 is not located. ) is also possible. The thickness of the plate portion of the two-side member is the same as the width of the gap G formed by the plate portion 7a of the hinge 7. As shown in FIG.

Alternatively, the configuration shown in FIG. 7 may be used. The configuration shown in FIG. 7 is different from the configuration shown in FIG. buckling stiffeners 3, and another set has a structure in which two buckling stiffeners 3 both consist of the buckling stiffeners 3 on the long side. The two fastening members 5 applied to the two sets are arranged in directions that intersect each other.

The structure shown in FIGS. 4 to 7 is a structure that does not require the connecting member 4A or the like, but the adjacent buckling receiving reinforcing plates 3 connected by the hinge 7 are two-sided members ( Equilateral angle steels 6, etc.) may be arranged at the corners of the square steel pipe columns 1, and the adjacent buckling-receiving reinforcing plates 3 may be connected by the fastening members 5 and the connecting plates 8. That is, for all adjacent buckling reinforcement plates 3, the side surface of one buckling reinforcement plate 3 and the edge side of the other buckling reinforcement plate 3 are connected and fixed by the fastening member 5 or the like.

Alternatively, the configuration shown in FIG. 8 may be used. The configuration shown in FIG. 8 is different from the configuration shown in FIG. It has a structure in which a buckling reinforcement plate 3 and another set of buckling reinforcement plates 3 are connected to each other via a connecting member 4A arranged between their sides. Such a structure can also be said to be a structure in which not all of the adjacent buckling reinforcement plates 3 but some of them are connected via the connecting member 4A or the like.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope.

1 : Square steel pipe column 2 : Floor slab concrete 3 : Buckling reinforcement plate 4 : Connection member 4A : Connection member 5 : Fastening member 6 : Equal angle steel (two-sided member)
6a: plate portion 7: hinge 7a: plate portion 8: connecting plate 9A: pipe 9B: insert nut 11: column base portion 11a: base plate 31: reinforcing bar G: gap

Claims (8)

On each surface of the column base of the square steel pipe column, a buckling reinforcement plate that receives buckling of the surface to the outside in the out-of-plane direction is arranged opposite to the surface with a gap formed therebetween. A pedestal reinforcing structure, wherein the buckling-receiving reinforcing plates are connected to each other at a corner side serving as an intersection of adjacent face portions of the square steel pipe column. In the column base reinforcing structure according to claim 1, the two-side member in which the two plate portions are positioned in a mountain shape contacts the surface portion near the corner portion of the square steel pipe column with the two plate portions. are placed in the
The buckling-receiving reinforcing plate faces the surface portion through the plate portion, and a gap is formed by the thickness of the plate portion between the buckling-receiving reinforcing plate and the surface portion of the square steel pipe column. Characteristic column base reinforcement structure. 2. The column base reinforcing structure according to claim 1, wherein the adjacent buckling-receiving reinforcing plates are connected by a hinge formed by rotatably connecting two plate portions, and the hinge serves as the corner of the square steel pipe column. The two plate portions are placed in contact with the surface portion near the portion,
The buckling-receiving reinforcing plate faces the surface portion through the plate portion, and a gap is formed by the thickness of the plate portion between the buckling-receiving reinforcing plate and the surface portion of the square steel pipe column. Characteristic column base reinforcement structure. The column base reinforcing structure according to any one of claims 1 to 3, wherein the buckling receiving reinforcing plate is a precast concrete slab. The column base reinforcing structure according to claim 4, wherein the precast concrete slab, which is the buckling receiving reinforcing plate, is provided with a steel plate on the side facing the surface portion of the square steel pipe column. . In the column base reinforcing structure according to any one of claims 1 to 5, all or part of the adjacent buckling-receiving reinforcing plates are arranged between side surfaces of the buckling-receiving reinforcing plates. Column base reinforcement structure, characterized in that they are connected to each other via connecting members. In the column base reinforcing structure according to any one of claims 1 to 5, all or part of the adjacent buckling-receiving reinforcing plates have a side surface of one buckling-receiving reinforcing plate and a side surface of the other buckling-receiving reinforcing plate. A column base reinforcement structure characterized in that buckling receiving reinforcing plates are connected to each other so as to face the edges of the faces of the sides facing the rectangular steel pipe columns. On each surface of the exposed part on the floor slab concrete in the column base of the square steel pipe column of the existing building, a buckling reinforcement plate that receives the buckling of the surface in the out-of-plane direction outside is installed with a gap from the surface. A method for reinforcing a column base of an existing building, comprising: forming and arranging the buckling-receiving reinforcing plates facing each other, and connecting the adjacent buckling-receiving reinforcing plates to each other at the corner side serving as the crossing portion of the adjacent face portions of the square steel pipe column.

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