Column construction

Abstract

This column structure provides cost savings by forming a notch on the lower side of the column into which the veranda of the floor fits, and then reinforcing this lower side to form the column base. [Solution] The column structure 1 comprises a column P made of lip channel steel 2, with an insertion hole 21a for a fastening member B1 formed at the lower side of the opposing surface portion 21, and a base plate BP joined to the lower end surface of the column P. On the indoor side of the lower part of the column P, a recessed area Pa is formed by cutting out the lip portion 23 of the column P and a part of each opposing surface portion 21 below the insertion hole 21a, so that the end of the floor portion 6 placed on the H-shaped steel beam 8 fits into it, and a reinforcing plate 3 is welded and fixed to the inner surface of each opposing surface portion 21, having a plate-side insertion hole 3a on the upper side that communicates with the insertion hole 21a and having a width that does not protrude into the recessed area Pa.

Description

Technical Field

[0001] This invention relates to a column structure in which the edge side of the floor part enters a location on the indoor side at the lower part of the column.

Background Art

[0002] For example, in a lightweight steel house composed of a lip channel steel column and an H-shaped steel beam, it has a column structure in which the edge side of the floor part enters a location on the indoor side of the second-floor column. As shown in FIGS. 7(A) and 7(B), the column part 9, separately from the lip channel steel 91 that serves as the column main body, uses a channel steel with a smaller depth dimension and a thicker plate thickness than the lip channel steel 91 to fabricate a column leg member 92, and this column leg member 92 is welded and fixed to the lip channel steel 91 via a clamping plate 93.

[0003] Patent Document 1 discloses a steel column plate that is installed at the column head and column foot of a steel column and is used when attaching the steel column to a building frame structure. This steel column plate is configured to have a steel flat plate-shaped main body part and at least one protruding part that extends outward from the main body part, and the column head and column foot of the steel column are configured to be placed and fixed on the protruding part.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above column structure, there is a drawback that the manufacturing cost of the column leg member 92 becomes high and the column structure becomes expensive. Further, the technology described in Patent Document 1 cannot solve the problems of a column structure in which a concave portion is formed in the indoor side portion at the lower part of the column.

[0006] The objective of this invention is to provide a column structure that can suppress cost increases by forming a recessed area on the lower side of the column body through a notch into which the edge of the floor fits, while reinforcing the lower side to form a column base. [Means for solving the problem]

[0007] The column structure according to this invention, in order to solve the above problems, comprises a column body made of steel material having a pair of opposing surfaces and a connecting surface connecting these opposing surfaces, with through holes for fastening members formed at the lower side of each of the opposing surfaces, and a base plate joined to the lower end surface of the column body and fixed to the upper flange of the beam, The lower part of the column is cut out below the insertion hole on the indoor side so that the end of the floor section placed on the beam fits into it, forming a recess. The inner surface of each of the opposing surfaces is welded and fixed with a reinforcing plate that has a plate-side insertion hole on the upper side that communicates with the insertion hole and has a width that does not protrude into the recess.

[0008] With the above configuration, the recessed portion into which the end of the floor section placed on the beam fits is formed by a cut in the steel material itself, and a reinforcing plate having a plate-side insertion hole is welded and fixed to the inner surface of each opposing surface, thereby reinforcing the lower side of the steel material. By using the lower side of the steel material thus reinforced as a column base, the cost increase of the column structure can be suppressed.

[0009] A binding plate may be provided that is welded and fixed to the recessed portion side of each reinforcing plate, spanning across the reinforcing plates. This would allow reinforcement to be provided at intermediate points in the height direction of the recessed portion.

[0010] The above-mentioned binding plate has bent portions at both ends, and each of these bent portions may be welded and fixed to each of the above-mentioned reinforcing plates. This allows the binding plate to be firmly fixed to each of the reinforcing plates.

[0011] The edge of the base plate is located below the lower end surfaces of the pair of opposing surfaces, and the reinforcing plate is positioned with its lower end surface spaced apart from the base plate. The lower end surface of the reinforcing plate, the edge portion of the base plate located below the lower end surface, and the inner surface of the lower part of each of the opposing surfaces may be fixed by groove welding. This allows the lower end surface of the reinforcing plate, the edge portion of the base plate, and the inner surface of the lower part of each of the opposing surfaces to be joined together, thereby increasing the strength of the lower end of the column. Furthermore, the space between the reinforcing plate and the base plate can function as an adjustment gap for aligning the through hole with the plate-side through hole.

[0012] The reinforcing plate may have a bent edge portion at least on the edge on the side of the recessed portion. This further increases the strength of the opposing surface portion.

[0013] In the configuration in which the reinforcing plate has the bent edge portion, a binding plate may be provided that is welded and fixed to the bent edge portion of each reinforcing plate across the reinforcing plates. Alternatively, the reinforcing plate may have a connecting surface side bent edge portion on the edge opposite to the recessed portion, which bends along the corner between the opposing surface portion and the connecting surface portion of the steel material. [Effects of the Invention]

[0014] With this invention, the lower part of the steel material that will form the column is notched and this lower part is reinforced and used as a column base, which has the effect of suppressing the increase in the cost of the column structure. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view diagram illustrating the column structure of the embodiment. [Figure 2] This is a longitudinal section diagram illustrating the column structure of the embodiment. [Figure 3] Figure (A) is an oblique view illustrating the lower part of the column used in the column structure shown in Figure 1, and Figure (B) is an explanatory diagram showing the lower part of the same column from a front view. [Figure 4]It is an explanatory drawing showing a modified example of the column body that can be used for the column structure of the embodiment. [Figure 5] FIG. (A) is a perspective explanatory drawing showing another modified example of the column body that can be used for the column structure of the embodiment, and FIG. (B) is a horizontal cross-sectional view of the column body. [Figure 6] FIG. (A) is a perspective explanatory drawing showing another modified example of the column body that can be used for the column structure of the embodiment, and FIG. (B) is a horizontal cross-sectional view of the column body. [Figure 7] It is a figure showing a structure provided with a separate column leg portion without cutting the lower side of the lip channel steel, FIG. (A) is a side view, and FIG. (B) is a front view.

Mode for Carrying Out the Invention

[0016] Hereinafter, an embodiment according to one aspect of the present invention will be described based on the accompanying drawings. As shown in FIGS. 1 and 2, the column structure 1 of this embodiment includes a column body P made of a lip channel steel 2 (steel material), and a base plate BP that is joined to the lower end surface of the column body P and fixed to the upper flange 8H of the H-shaped steel beam 8. The lip channel steel 2 has a pair of opposing surfaces 21, 21, a connecting surface 22 that connects these opposing surfaces 21, 21, and lip portions 23, 23 located at the edges of the opposing surfaces 21, 21 (for example, C-80×80×20×2.3 mm). Insertion holes 21a for bolts B1 of, for example, M12, which are fastening members, are formed at the lower side positions of each opposing surface 21.

[0017] The column body P is fixed to the outdoor half side of the upper flange 8H of the H-shaped steel beam 8 by bolts B2. Further, wall panels 7, 7 are installed on both sides of the column body P, and the ends of the lower horizontal frames 71 of each wall panel 7 are fixed to the upper flange 8H by bolts B2. One of the wall panels 7A is a shear wall panel having a brace 72. The lower side of the brace 72 is joined to the lower side of the vertical frame 73 on the column body P side, which is one side of the wall panel 7, and the upper side is joined to the upper side of the vertical frame 73 on the other side of the wall panel 7.

[0018] Further, as shown in FIGS. 3(A) and 3(B), bolt insertion holes for bolt B1 are formed in the lower side of the vertical frame 73 on the column P side of each wall panel 7. The height position of the insertion hole 21a of the opposing surface portion 21 coincides with the height position of the bolt insertion hole for bolt B1. Bolt B1 is passed horizontally through the bolt insertion hole of the vertical frame 73 and the insertion hole 21a of the opposing surface portion 21 for the one wall panel 7A.

[0019] On the indoor side of the lower part of the column P, a recessed portion Pa is formed in which the end of the floor portion 6 disposed on the indoor half surface side of the upper flange 8H of the H-shaped steel beam 8 enters, with the lip portion 23 of the column P and a part of each opposing surface portion 21 being cut out below the insertion hole 21a. And on the inner surface of each opposing surface portion 21, a reinforcing plate 3 having a plate-side insertion hole 3a communicating with the insertion hole 21a at the upper side and having a width that does not protrude into the recessed portion Pa is welded and fixed. The reinforcing plate 3 is made of, for example, a steel plate having a plate thickness such as 3.2 mm, 4.5 mm, etc. The diameter of the plate-side insertion hole 3a is the same as the diameter of the insertion hole 21a or about 1 mm larger.

[0020] The reinforcing plate 3 is fillet welded at the vertical side portion on the recessed portion Pa side to the opposing surface portion 21 and at the vertical side portion on the side opposite to the recessed portion Pa side to the connecting surface portion 22 at the manufacturing factory of the column P. When performing this welding, pins (not shown) are passed through the insertion hole 21a and the plate-side insertion hole 3a so that bolt B1 passes through the insertion hole 21a and the plate-side insertion hole 3a.

[0021] Furthermore, during the welding of the reinforcing plate 3, the edge of the base plate BP is brought into contact with the lower end surfaces of the pair of opposing surfaces 21, 21, while the lower end surface of the reinforcing plate 3 is spaced apart from the base plate BP. This space is, for example, approximately the thickness of the reinforcing plate 3. Then, I-groove welding is performed between the lower end surface of the reinforcing plate 3, the edge portion of the base plate BP located below the lower end surface, and the lower inner surface of each of the opposing surfaces. As a result, the edge of the base plate BP is positioned below the lower end surface of the opposing surfaces 21, the reinforcing plate 3 is positioned with its lower end surface spaced apart from the base plate BP, and the lower end surface of the reinforcing plate 3, the edge portion of the base plate BP located below the lower end surface, and the lower inner surface of the opposing surfaces 21 are fixed together. Of course, the welding method is not limited to this type of groove welding.

[0022] Furthermore, the column structure 1 of this embodiment includes, for example, a bridging plate 31 made of a steel plate with a thickness of 2.3 mm. The bridging plate 31 is welded and fixed to the recessed portion Pa side of each reinforcing plate 3 across the reinforcing plates 3. In this example, the bridging plate 31 has bent portions 31a at both ends, and each bent portion 31a is welded and fixed to each reinforcing plate 3. The welding configuration is not limited to this form, and a flat bridging plate 31 may be used, with both ends welded to the vertical edges on the recessed portion Pa side of the opposing surface portion 21.

[0023] With the above configuration, a recess Pa into which the end of the floor section 6, which is positioned on the upper flange 8H of the H-shaped steel beam 8, fits is formed by a cut in the lip channel steel 2 itself. In addition, the lower side of the lip channel steel 2 (column P) is reinforced by welding and fixing a reinforcing plate 3 having a plate-side insertion hole 3a to the inner surface of each opposing surface section 21. By using the lower side of the reinforced lip channel steel 2 as a column base, the cost increase of the column structure can be suppressed.

[0024] By providing a binding plate 31 across the reinforcing plates 3, 3, reinforcement can be provided at intermediate points in the height direction of the recessed area Pa. Furthermore, if the binding plate 31 has bent portions 31a at both ends, these bent portions 31a can firmly fix the binding plate 31 to each reinforcing plate 3.

[0025] Furthermore, when the lower end surface of the reinforcing plate 3, the edge portion of the base plate BP located below the lower end surface, and the lower inner surface of each opposing surface portion 21 are fixed by groove welding, the lower end surface of the reinforcing plate 3, the edge portion of the base plate BP, and the lower inner surface of each opposing surface portion 21 are joined to each other, thereby increasing the strength of the lower end side of the column P. In addition, the gap between the reinforcing plate 3 and the base plate BP can function as an adjustment gap for aligning the insertion hole 21a of the opposing surface portion 21 and the plate-side insertion hole 3a of the reinforcing plate 3.

[0026] Figure 4 shows a modified form of column structure 1, called column structure 1A. In addition to the configuration of column structure 1, column structure 1A further includes a flat lip-side binding plate 32 that is welded to each lip portion 23, 23 located above the recessed area Pa. By including the lip-side binding plate 32, the area above the recessed area Pa is reinforced by the lip-side binding plate 32, making it easy to set areas where welding between the reinforcing plate 3 and the opposing surface portion 21 is not performed, thus speeding up the welding work. Furthermore, welding with the opposing surface portion 21 is performed continuously from the upper side of the reinforcing plate 3 to the vicinity of the binding plate 31, and the areas where welding is not performed are set in the middle of the height direction of the recessed area Pa. This makes it easier for bending deformation to occur at the recessed area Pa during a strong earthquake, and prevents buckling near the insertion hole 21a of the opposing surface portion 21.

[0027] Furthermore, for the welding and fixing of the lip-side binding plate 32, the welding position is determined so that the tip of a power fastener (not shown) for fastening bolt B2 can be inserted.

[0028] Figures 5(A) and 5(B) show a modified form of column structure 1, which is column structure 1B. This column structure 1B is equipped with a reinforcing plate 3A in place of the reinforcing plate 3 in column structure 1. The reinforcing plate 3A has a bent edge portion 3b on the edge on the recessed portion Pa side, and the flat portion of the reinforcing plate 3A is spaced apart from the opposing surface portion 21 by the width of this bent edge portion 3b. As an example of welding, the vertical edge portion of the bent edge portion 3b is welded to the opposing surface portion 21, the straight portion of the reinforcing plate 3A is welded to the base plate BP, and the vertical edge portion of the reinforcing plate 3A on the side opposite to the recessed portion Pa side is welded to the connecting surface portion 22.

[0029] The base plate BP is welded to the lower end surfaces of each opposing surface portion 21 and the lower end surface portion 22 of the connecting surface portion 22, for example, before welding the reinforcing plate 3A. Furthermore, a sash plate 31 is welded to each reinforcing plate 3A, spanning between them. This sash plate 31 has a flat shape, and its end is welded to the bent edge portion 3b on the outer side. In this modified example, the lip-side sash plate 32 can also be welded in place.

[0030] Figures 6(A) and 6(B) show a modified column structure 1C of column structure 1B. This column structure 1C is equipped with a reinforcing plate 3B instead of the reinforcing plate 3A in column structure 1B. The reinforcing plate 3B has a bent edge portion 3b on the edge on the recessed portion Pa side and a connecting surface side bent edge portion 3c on the edge opposite to the recessed portion Pa side, and its horizontal cross section is approximately U-shaped. The connecting surface side bent edge portion 3c has a shape that bends along the inner angle between the opposing surface portion 21 and the connecting surface portion 22 of the lip channel steel 2. As an example of welding, the bending start R portion of the bent edge portion 3b is welded to the opposing surface portion 21, the lower side of the reinforcing plate 3B is welded to the base plate BP, and the connecting surface side bent edge portion 3c is welded to the connecting surface portion 22. In addition, a bridging plate 31 is welded to each reinforcing plate 3B across the reinforcing plates 3B, 3B. This binding plate 31 has a flat shape, and its end is welded and fixed to the outer surface of the bent edge portion 3b. In this modified example, the lip-side binding plate 32 may also be welded and fixed.

[0031] In these examples, lip channel steel 2 was used as the steel material for the column body, but channel steel or square pipe (having two connecting surfaces arranged opposite each other) can be used as the steel material for the column body. In the column structure using the square pipe described above, the lip-side bridging plate 32 is not required. Also, in the column structure using the channel steel described above, instead of the lip-side bridging plate 32, a bridging plate that straddles the edges of the opposing surfaces of the channel steel is welded and fixed to the edges of the opposing surfaces.

[0032] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the equivalent scope. [Explanation of Symbols]

[0033] 1: Column structure 2: Lip channel steel (steel material) 3: Reinforcement plate 3A: Reinforcement plate 3B: Reinforcement plate 3a: Through hole on the plate side 3b: Bent edge 3c: Bent edge on the connecting surface side 6: Floor part 7: Wall panels 7A: Wall panel 8:H-shaped steel beam (beam) 8H: Upper flange 21: Opposing surface part 21a: Through hole 22: Connecting surface 23: Lip part 31: Scripting board 31a: Bent section 32: Lip-side binding plate 71: Horizontal frame 72: Brace 73: Vertical frame B1: Bolt (fastening component) B2: Bolt BP: Base plate P: Column Pa: recessed area

Claims

1. A column structure comprising a column body made of steel having a pair of opposing surfaces and a connecting surface connecting these opposing surfaces, with through holes for fastening members formed at the lower side of each of the opposing surfaces, and a base plate joined to the lower end surface of the column body and fixed to the upper flange of a beam, The column structure is characterized in that, on the indoor side of the lower part of the column, a recess is formed by cutting out the lower part of the column below the insertion hole so that the end of the floor part placed on the beam fits into it, and a reinforcing plate is welded and fixed to the inner surface of each of the opposing surfaces, having a plate-side insertion hole on the upper side that communicates with the insertion hole and having a width that does not protrude into the recess.

2. The column structure according to claim 1, characterized in that it comprises a binding plate that is welded and fixed to the recessed portion side of each reinforcing plate across the reinforcing plates.

3. The column structure according to claim 2, wherein the binding plate has bent portions at both ends, and each of the bent portions is welded and fixed to each of the reinforcing plates.

4. The column structure according to claim 1, wherein the edge of the base plate is located below the lower end surfaces of the pair of opposing surfaces, the reinforcing plate is positioned with its lower end surface spaced apart from the base plate, and the lower end surface of the reinforcing plate, the edge portion of the base plate located below the lower end surface, and the inner surface of the lower part of each of the opposing surfaces are fixed by groove welding.

5. The column structure according to claim 1, characterized in that the reinforcing plate has a bent edge portion at least on the edge on the side of the recessed portion.

6. The column structure according to claim 5, characterized in that it comprises a binding plate that is welded and fixed to the bent edge of each reinforcing plate across the reinforcing plates.

7. The column structure according to claim 5, wherein the reinforcing plate has a connecting surface side bent edge portion on the edge opposite to the recessed portion, which bends along the corner between the opposing surface portion and the connecting surface portion of the steel material.

Images