Reinforcement structure of steel pipe column

Abstract

To suppress local buckling of a steel pipe column when heat is input from a horizontal joint of a surface material that constitutes a wall body.SOLUTION: A reinforcement structure of a steel pipe column 2 comprises a reinforcing member (4) and a fixing member (8). The reinforcing member (4) extends in the vertical direction across a horizontal joint position (Lj) of at least one of face materials that constitute a wall body and abuts against side face portions (23, 24) of the steel pipe column. The reinforcing member (4) includes, for example, a first member (41) fixed to one side face portion (23) of the steel pipe column and a second member (42) fixed to the other side face portion (24) of the steel pipe column. The fixing member (8) is a member for fixing the reinforcing member (4) to the steel pipe column (2).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a reinforcement structure for a steel pipe column, and more particularly to a reinforcement structure for a steel pipe column erected within a wall body such as an exterior wall. [Background technology]

[0002] When a fire occurs around or inside a building and the walls are heated, the joints in the surfaces (exterior and interior surfaces) are more likely to transmit the heat of the fire than other parts (general parts).

[0003] Conventionally, heat input from joints has been suppressed by placing fireproof material in the joints. For example, in JP 2017-066680 A (Patent Document 1), a crosspiece is provided in the joints of gypsum boards (interior facing materials) and a heat-expandable fireproof material is sandwiched between the crosspiece and the gypsum board joints to suppress heat input from the joints. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-066680 A Summary of the Invention [Problem to be solved by the invention]

[0005] Since the joint width that can be applied with thermally expandable fire-resistant materials is relatively narrow, they are suitable for sealing joints in interior facing materials such as gypsum boards, but are not suitable for sealing joints in exterior facing materials, which have a relatively large joint width (for example, 10 mm or more).

[0006] In addition, heating experiments on walls have confirmed that sealing the joints with cross bars and heat-expandable fire-resistant material is effective in reducing heat input from the joints. However, there is a possibility that heat input from the joints (horizontal joints) may cause the columns to partially buckle, and this may be insufficient to meet the required fire resistance.

[0007] The present invention has been made to solve the above-mentioned problems, and its object is to provide a reinforcing structure for a steel pipe column that can suppress local buckling of the steel pipe column when heat is input through the horizontal joints of the surface materials that make up the wall. [Means for solving the problem]

[0008] A reinforcement structure for a steel pipe column according to an aspect of the present invention is a reinforcement structure for a steel pipe column erected in a wall body, and includes a reinforcing member and a fixing member. The reinforcing member extends in the vertical direction across a horizontal joint position of at least one of the face materials constituting the wall body, and abuts against a side portion of the steel pipe column. The fixing member is a member for fixing the reinforcing member to the steel pipe column.

[0009] Preferably, the reinforcing member includes a first member fixed to one side surface of the steel pipe pole and a second member fixed to the other side surface of the steel pipe pole. It is preferable that the first member and the second member each include a plate having an abutment surface that abuts against the side surface and a rib perpendicular to the plate.

[0010] In a configuration in which the steel pipe column has an open cross section with an opening on one side, it is desirable that the first member and the second member are arranged in the internal space of the steel pipe column.

[0011] The reinforcing member may further include a third member fixed to the closing surface portion facing the opening portion of the steel pipe column.

[0012] The first and second members may be formed of T-shaped metal fittings or L-shaped metal fittings. In the latter case, it is preferable that the rib is disposed on the opening side.

[0013] In a configuration in which the steel pipe column has an open cross-section with an opening on one side, it is also desirable that the reinforcing member includes a first plate fixed to one side portion of the steel pipe column, a second plate fixed to the other side portion of the steel pipe column, and a connecting portion that is arranged within a predetermined height range including the horizontal joint position and extends laterally between the first plate and the second plate.

[0014] The fixing member may include a bolt and also serve as a frame fixing means for fixing the wall frame material to the side portion of the steel pipe column. Effect of the Invention

[0015] According to the present invention, since the reinforcing member is fixed to the horizontal joint corresponding portion (the portion spanning the horizontal joint position) of (at least) the side portion of the steel pipe column, local buckling of the steel pipe column can be suppressed when heat is input from the horizontal joint of the facing material. As a result, the fire resistance of the wall body can be improved. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a cross-sectional view showing a schematic basic structure of an exterior wall according to each embodiment of the present invention. [Diagram 2] FIG. 1 is a cross-sectional view showing a reinforcing structure of a steel pipe column according to embodiment 1 of the present invention. [Diagram 3] FIG. 1 is a vertical cross-sectional view showing a reinforcement structure for a steel pipe column according to embodiment 1 of the present invention. [Figure 4] FIG. 2 is a perspective view of a metal fitting that constitutes a reinforcing member in accordance with the first embodiment of the present invention. [Diagram 5] 5(A) and (B) are a front view and a side view, respectively, of the metal fitting shown in FIG. [Figure 6] FIG. 4 is a cross-sectional view showing another reinforcing structure of the steel pipe column according to embodiment 1 of the present invention. [Figure 7] FIG. 2 is a cross-sectional view showing a reinforcing structure of a steel pipe column in a modified example of the first embodiment of the present invention. [Figure 8] FIG. 13 is a perspective view of a metal fitting that constitutes a reinforcing member in a modified example of the first embodiment of the present invention. [Figure 9] FIG. 11 is a cross-sectional view showing a reinforcing structure of a steel pipe column according to embodiment 2 of the present invention. [Figure 10] FIG. 11 is a perspective view of a metal fitting that constitutes a reinforcing member in accordance with a second embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view showing a reinforcing structure of a steel pipe column in a modified example of embodiment 2 of the present invention. [Figure 12]FIG. 11 is a perspective view of a metal fitting that constitutes a reinforcing member in a modified example of the second embodiment of the present invention. [Figure 13] FIG. 4 is a cross-sectional view showing a reinforcement structure of a steel pipe pole according to another embodiment of the present invention. [Figure 14] FIG. 11 is a cross-sectional view showing another reinforcement structure of a steel pipe column according to another embodiment of the present invention. [Figure 15] 15 is a perspective view showing an example of the shape of the metal fitting shown in FIG. 14. [Figure 16] FIG. 1 is a diagram showing a schematic diagram of the shape change (local buckling) of a steel pipe column to which no heat input countermeasures are applied when heat is input. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and their description will not be repeated.

[0018] <Basic structure> The basic structure of an exterior wall 1 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view that shows a schematic view of the basic structure of an exterior wall 1 according to this embodiment. Arrow A1 indicates the width direction (left-right direction) of the exterior wall 1, and arrow A2 indicates the outdoor side of the exterior wall 1.

[0019] Referring to FIG. 1, an exterior wall 1 includes a steel pipe column 2 extending in the up-down direction (vertical direction), an exterior facing material 12 arranged on the outdoor side of the steel pipe column 2, and an interior facing material 13 arranged on the indoor side of the steel pipe column 2. The exterior facing material 12 typically includes an exterior wall finishing material such as siding. The interior facing material 13 typically includes gypsum board. In the air space between the exterior facing material 12 and the interior facing material 13, a wall frame material 14 that forms the framework of an exterior wall panel, for example, is arranged. In this embodiment, the wall frame material 14 is formed of a plurality of channel steels arranged vertically and horizontally, and a heat insulating material 15 is filled inside.

[0020] The steel pipe column 2 is, for example, a channel steel with a lip having an open cross section, and has an opening 20 on one side. The steel pipe column 2 is arranged so that the opening 20 faces the indoor side. The steel pipe column 2 is composed of a closed surface portion 21 facing the exterior surface material 12, a pair of lip portions 22, 22 facing the interior surface material 13, and a pair of side portions 23, 24 perpendicular (intersecting) to the closed surface portion 21 and the lip portion 22. The closed surface portion 21 and the lip portion 22 do not have to directly face the exterior surface material 12 and the interior surface material 13, and other members (for example, a heat insulating material) may be interposed between them. The side portions 23, 24 do not face the exterior surface material 12 and the interior surface material 13, but are arranged parallel to the direction perpendicular (intersecting) to the exterior surface material 12 and the interior surface material 13 (that is, the depth direction of the exterior wall 1). The steel pipe column 2 may be a channel steel without a lip portion 22.

[0021] In this embodiment, the vertical members 140 of the wall frame material 14 are arranged so as to abut against the outer surfaces of the pair of side portions 23, 24. The vertical members 140 are channel steel and have a substantially U-shaped cross section. The vertical members 140 are fixed to the respective side portions 23, 24 by bolts 31 and nuts 32. The bolts 31 and nuts 32 constitute frame fixing means 30 for fixing the wall frame material 14 to the side portions 23, 24 of the steel pipe column 2. The frame fixing means 30 are provided at a plurality of locations along the height direction of the steel pipe column 2.

[0022] When heat is input from the horizontal joint of the interior surface material 13 into the exterior wall 1, as shown in Figs. 16(A) and (B), a steel pipe column 102 without measures against heat input may buckle at a portion 2j corresponding to the horizontal joint position Lj (hereinafter referred to as "horizontal joint corresponding portion"). Specifically, the horizontal joint corresponding portion 2j may deform so that the side portions 23, 24 stick to each other. The horizontal joint corresponding portion 2j is a portion that overlaps with the horizontal joint position Lj when viewed from the front. Note that the fixing points by the frame fixing means 30 described above are usually both above and below the horizontal joint position Lj.

[0023] Therefore, in this embodiment, the horizontal joint corresponding portion 2j, which is a weak portion of the steel pipe column 2, is reinforced by a "reinforcing member" described later, thereby suppressing local buckling as shown in Fig. 16(B). The reinforcing structure of the steel pipe column 2 will be described in detail below.

[0024] <Reinforcement structure of steel pipe columns> [Embodiment 1] The reinforcement structure of a steel pipe pole 2 according to embodiment 1 will be described with reference to Fig. 2 to Fig. 5. Fig. 2 and Fig. 3 are a cross-sectional view and a longitudinal sectional view, respectively, showing the reinforcement structure of a steel pipe pole 2. Fig. 4 is a perspective view of a metal fitting 50 constituting a reinforcing member 4, and Figs. 5(A) and (B) show a front view and a side view of the metal fitting 50, respectively. Arrow A3 in Fig. 3 indicates the up-down direction (height direction).

[0025] 2 and 3, the reinforcement structure of the steel pipe column 2 includes a reinforcing member 4 and a fixing member 8. The reinforcing member 4 extends in the vertical direction across the horizontal joint position Lj of the interior surface material 13, and is disposed so as to abut against (at least) the side portions 23, 24 of the steel pipe column 2. The fixing member 8 is a member for fixing the reinforcing member 4 to the steel pipe column 2, and includes a bolt 81 and a nut 82.

[0026] The reinforcing member 4 in this embodiment includes a first member 41 fixed to one side surface portion 23 of the steel pipe pole 2, and a second member 42 fixed to the other side surface portion 24 of the steel pipe pole 2. The first member 41 and the second member 42 are both composed of a T-shaped metal fitting 50 shown in Figs. 4 and 5.

[0027] As shown in Figs. 4 and 5, the metal fitting 50 includes a flat, elongated plate 51 and a rib 52 perpendicular to a surface 51a of the plate 51. The rib 52 is formed in a plate shape like the plate 51 and is provided at the center of the width direction (short side direction) of the plate 51. In the attached state, the rib 52 is disposed at the center of the depth direction of the steel pipe column 2. Through holes 510, 510 are provided at both ends of the longitudinal direction (vertical direction) of the plate 51. The rib 52 extends in the vertical direction between the fixing regions (regions where the through holes 510 are provided) at the upper and lower ends of the plate 51. The rib 52 is fixed to the surface 51a of the plate 51 by welding or the like. The metal fitting 50 is formed in a T-shape except for the fixing region.

[0028] In this embodiment, the first member 41 and the second member 42 are arranged in the internal space of the steel pipe column 2. The metal fitting 50 constituting the first member 41 is arranged so that the plate 51 abuts (is in surface contact with) the inner surface of the side portion 23 of the steel pipe column 2. The metal fitting 50 constituting the second member 42 is similarly arranged so that the plate 51 abuts (is in surface contact with) the inner surface of the side portion 24 of the steel pipe column 2. The first member 41 and the second member 42 are fixed at the same position and height so that the ribs 52, 52 face each other.

[0029] As shown in Fig. 3, the interval between the rib 52 of the first member 41 and the rib 52 of the second member 42 is desirably smaller than the opening width of the steel pipe pole 2. The protruding dimension of the rib 52 based on the plate 51 is desirably equal to or greater than the width dimension of the lip portion 22. This makes it possible to compensate for the lack of strength caused by the steel pipe pole 2 having the opening 20. The protruding dimension of the rib 52 is determined taking into consideration the size that allows the metal fitting 50 to be inserted from the opening 20.

[0030] As shown in Fig. 3, in the attached state, the upper through hole 510 of the metal fitting 50 is located above the horizontal joint corresponding portion 2j, and the lower through hole 510 of the metal fitting 50 is located below the horizontal joint corresponding portion 2j. Bolt holes (not shown) are drilled in advance in the side portions 23, 24 of the steel pipe column 2 at positions corresponding to the through holes 510. It is desirable that the upper bolt hole and the lower bolt hole sandwiching the horizontal joint corresponding portion 2j are drilled so as to be at equal distances from the horizontal joint position Lj.

[0031] The bolt 81 of the fixing member 8 is inserted into the through hole 510 of the metal fitting 50 and the bolt hole of the side surface portion 23 (24), and is fixed by the nut 82. As a result, the upper and lower ends of the T-shaped metal fitting 50 which is long in the vertical direction are firmly fixed by the fixing member 8. The bolt 81 is not limited to an example in which it is passed from the inside of the steel pipe column 2, and it may be passed from the outside of the steel pipe column 2, with the nut 82 disposed in the internal space of the steel pipe column 2.

[0032] In this way, the metal fittings 50 (first member 41 and second member 42) in surface contact with the inner surfaces of the side portions 23, 24 are fixed to the horizontal joint corresponding portion 2j of the steel pipe column 2 by the fixing member 8. In other words, the side portions 23, 24 are reinforced (from the inside of the steel pipe column 2) by the reinforcing member 4. In this embodiment, since the width-thickness ratio and slenderness ratio in the horizontal joint corresponding portion 2j of the steel pipe column 2 are small, it is possible to prevent the occurrence of local buckling (buckling of the horizontal joint corresponding portion 2j) as shown in FIG. 16(B) when heat is input from the horizontal joint of the interior surface material 13.

[0033] In addition, since the reinforcing member 4 is provided at pinpoint in the horizontal joint corresponding portion 2j, it is more economical than suppressing buckling by increasing the plate thickness of the steel pipe column 2 itself. It is desirable that the reinforcing member 4 is provided at each joint corresponding portion 2j.

[0034] Moreover, in this embodiment, since the metal fittings 50 constituting the reinforcing member 4 are arranged in the internal space of the steel pipe column 2, the decrease in strength of the metal fittings 50 due to an increase in temperature is smaller than when the metal fittings 50 are arranged on the outer periphery of the steel pipe column 2, and the buckling suppression effect in the event of a fire can be prolonged.

[0035] The fixing member 8 that fixes the reinforcing member 4 may also serve as the frame fixing means 30 (FIG. 1) described above. That is, as shown in FIGS. 2 and 3, both the plate 51 of the metal fitting 50 and the wall frame member 14 (vertical member 140) may be fixed to the side portion 23 (24) of the steel pipe column 2 by a common bolt 81 and nut 82.

[0036] 6, the reinforcing member 4A may further include a third member 43 fixed to the closed surface portion 21 of the steel pipe column 2. The third member 43 may also be constituted by a T-shaped metal fitting 50 similar to the first member 41 and the second member 42. In this case, since three sides of the steel pipe column 2 are reinforced, local buckling of the steel pipe column 2 can be more effectively suppressed.

[0037] Although it is preferable that the reinforcing member 4 includes both the first member 41 and the second member 42, it may include only one of them.

[0038] (Variations in metal fitting shape) The above-mentioned reinforcing member 4 (4A) has been described as an example in which each of the members 41, 42 is composed of a T-shaped metal fitting 50, but the present invention is not limited to such an example. For example, as in the reinforcing member 4B shown in FIG. 7, each of the members 41, 42 may be composed of an L-shaped metal fitting 50A. FIG. 8 is a perspective view of the metal fitting 50A. The metal fitting 50A includes a vertically long plate 51 and a vertically long rib 52 provided at one end of the plate 51 in the width direction, and is formed in an L shape (excluding the fixing areas at the top and bottom ends). The plate 51 and the rib 52 of the metal fitting 50A may be formed by bending a single thin plate.

[0039] Since the opening 20 side (lip portion 22 side) of the steel pipe column 2 is weaker than the closing surface portion 21, it is desirable to fix the metal fitting 50A with the fixing member 8 so that the rib 52 is located on the opening 20 side, as shown in Fig. 7. In the installed state, the rib 52 is positioned shifted from the center in the depth direction of the steel pipe column 2 toward the indoor side. This is expected to have a greater buckling suppression effect.

[0040] In addition, although it is preferable that the rib 52 of the metal fitting 50 (50A) extends in the vertical direction as described above, multiple ribs may be provided continuously with some intervals between them. Alternatively, although it is preferable that the plate 51 of the metal fitting 50 (50A) extends in the vertical direction as described above, it may be divided into upper and lower parts with the rib 52 in between (the end face of the rib 52 may be configured to abut against the steel pipe column 2).

[0041] Furthermore, although it is preferable that the metal fitting 50 (50A) includes both the plate 51 and the rib 52, it may include only the plate 51 extending in the vertical direction.

[0042] [Embodiment 2] The reinforcement structure of a steel pipe column 2 according to embodiment 2 will be described with reference to Fig. 9 and Fig. 10. Fig. 9 is a cross-sectional view showing the reinforcement structure of a steel pipe column 2 according to the present embodiment, and Fig. 10 is a perspective view of a metal fitting 50B constituting a reinforcing member 4C in the present embodiment.

[0043] In the above-mentioned embodiment 1, the reinforcing member 4 (4A, 4B) includes a first member 41 and a second member 42, and the horizontal joint corresponding portion 2j of the steel pipe column 2 is reinforced by a plurality of metal fittings 50, whereas in the present embodiment, the reinforcing member 4C is composed of a single member (metal fitting 50B).

[0044] The metal fitting 50B constituting the reinforcing member 4C includes a first plate 53 fixed to one side surface portion 23 of the steel pipe column 2, a second plate 54 fixed to the other side surface portion 24 of the steel pipe column 2, and a connecting portion 55 extending laterally between the first plate 53 and the second plate 54. The first plate 53 and the second plate 54 extend in the vertical direction and are arranged parallel to each other, similar to the plate 51 of the first embodiment. The connecting portion 55 is formed, for example, in a plate shape, similar to the rib 52 of the first embodiment, and is perpendicular to the first plate 53 and the second plate 54. The connecting portion 55 is provided in the width direction center of the first plate 53 and the second plate 54, and the metal fitting 50B is formed in an H shape. The connecting portion 55 is arranged in the depth direction center of the steel pipe column 2 in the attached state.

[0045] The first plate 53 has through holes 530, 530 at both longitudinal (vertical) ends for inserting the bolt 81, and the second plate 54 has through holes 540, 540 at both longitudinal (vertical) ends for inserting the bolt 81.

[0046] The metal fitting 50B is formed to a size that allows it to be inserted from the opening 20 of the steel pipe column 2. As shown in Fig. 9, if necessary, spacers 56 such as washers may be provided between the first plate 53 and one side portion 23 of the steel pipe column 2, and between the second plate 54 and the other side portion 24 of the steel pipe column 2. In this manner, the reinforcing member 4C may be provided with the spacers 56 that abut against the side portions 23, 24 of the steel pipe column 2.

[0047] In this embodiment, a connecting portion 55 extending in the vertical direction across the horizontal joint position Lj is bridged between a first plate 53 fixed to one side surface portion 23 and a second plate 54 fixed to the other side surface portion 24. Therefore, as shown in Fig. 16(B), when heat is input from the horizontal joint of the interior surface material 13, the connecting portion 55 can resist the deformation force that would cause the side surface portions 23, 24 to stick together. In other words, the connecting portion 55 can brace the pair of side surface portions 23, 24 (both side surfaces of the horizontal joint corresponding portion 2j) located at the horizontal joint position Lj.

[0048] The shape of the metal fitting 50B is not limited to the H-shape, and may be formed, for example, in a substantially U-shape, as in the metal fitting 50C shown in Figures 11 and 12. In this case as well, it is desirable to fix the connecting portion 55 with the fixing member 8 so that it is positioned on the opening 20 side. In other words, it is desirable that the connecting portion 55 is positioned in the attached state, shifted from the center in the depth direction of the steel pipe column 2 toward the indoor side.

[0049] [Other embodiments] In the above-mentioned embodiments 1 and 2, the open cross-section steel pipe column 2 is targeted, but it is also possible to reinforce a closed cross-section steel pipe column by using, for example, a T-shaped metal fitting 50 as shown in FIG. 4. FIG. 13 shows a square steel pipe column 2A reinforced with a T-shaped metal fitting 50. In the example of FIG. 13, two metal fittings 50 are fixed to the outer surfaces of the side portions 23, 24 of the steel pipe column 2A by a fixing member 8A. The fixing member 8A includes, for example, a through bolt 83 that penetrates the two metal fittings 50 and the pair of side portions 23, 24.

[0050] Also, as shown in Fig. 14, it is possible to reinforce all four sides of the steel pipe column 2A using metal fittings 50. In this case, by slightly shifting the position of the metal fittings 50 fixed to the side surface portions 23, 24 from the position of the metal fittings 50 fixed to the other two surfaces (the surface corresponding to the above-mentioned closed surface portion 21 and the surface on the lip portion 22 side) in the vertical direction, it is possible to avoid interference between the through bolts 83 that intersect with each other. Alternatively, as in the case of a metal fitting 50D shown in Fig. 15, it is also possible to reinforce the four sides of the steel pipe column 2A without shifting the position of the metal fittings 50 by providing two through holes 510 at each of the upper and lower ends of the plate 51.

[0051] In addition, the reinforcement structure in each embodiment is designed to accommodate heat input from the horizontal joints of the interior facing material 13 of the exterior wall 1, but it can also be used to accommodate heat input from the horizontal joints of the exterior facing material 12. Alternatively, the above technology can be applied to reinforce steel pipe columns of walls other than the exterior wall 1 (such as partition walls).

[0052] The above-described embodiments and modifications may be combined as appropriate.

[0053] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0054] 1 exterior wall, 2,2A,102 steel pipe column, 2j horizontal joint corresponding part, 4,4A,4B,4C reinforcing member, 8,8A fixing member, 12 exterior surface material, 13 interior surface material, 14 wall frame material, 20 opening, 21 closing surface part, 22 lip part, 23,24 side part, 30 frame fixing means, 31,81 bolt, 32,82 nut, 41 first member, 42 second member, 43 third member, 50,50A,50B,50C,50D metal fittings, 51 plate, 52 rib, 53 first plate, 54 second plate, 55 connecting part, 56 spacer, 83 through bolt, 510,530,540 through hole, Lj horizontal joint position.

Claims

1. A reinforcing structure for a steel pipe column erected inside a wall body, A reinforcing member extending in the vertical direction across the horizontal joint position of at least one of the face materials constituting the wall body and abutting against the side portion of the steel pipe column; A reinforcing structure for a steel pipe column comprising a fixing member for fixing the reinforcing member to the steel pipe column.

2. The reinforcing member includes a first member fixed to one side portion of the steel pipe pole and a second member fixed to the other side portion of the steel pipe pole, The steel pipe column reinforcement structure according to claim 1 , wherein the first member and the second member each include a plate having a contact surface that contacts the side portion and a rib perpendicular to the plate.

3. The steel pipe column has an open cross section with an opening on one side, The steel pipe column reinforcement structure according to claim 2 , wherein the first member and the second member are arranged in an internal space of the steel pipe column.

4. The reinforcing structure for a steel pipe column according to claim 3, wherein the reinforcing member further includes a third member fixed to a closing surface portion facing the opening portion of the steel pipe column.

5. The steel pipe column reinforcement structure according to claim 3, wherein the first member and the second member are formed in an L-shape, and the rib is arranged on the opening side.

6. The steel pipe column has an open cross section with an opening on one side, The reinforcing member includes a first plate fixed to one side portion of the steel pipe column, a second plate fixed to the other side portion of the steel pipe column, and a connecting portion arranged within a predetermined height range including the horizontal joint position and extending laterally between the first plate and the second plate. The reinforcing structure of the steel pipe column according to claim 1.

7. The steel pipe column reinforcement structure according to claim 1, wherein the fixing member includes a bolt and also serves as a frame fixing means for fixing a wall frame material to the side portion of the steel pipe column.

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