Column head structure

Abstract

To provide a column head structure capable of positioning a joint reinforcement.SOLUTION: The capital part structure 100 includes a joining steel pipe 40 formed in a cylindrical shape with the vertical direction as an axial direction, a plurality of joining reinforcing bars 44 arranged inside the joining steel pipe 40 and extending in the vertical direction, an upper installation portion 41 provided at an upper portion of the joining steel pipe 40, a jig 50 fixed to the upper installation portion 41, and an annular member 60 fixed to the jig 50, and an anchoring portion 45 provided at an upper portion of the joining reinforcing bar 44 is locked to the annular member 60.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a column capital structure. [Background technology]

[0002] Conventionally, composite structures consisting of columns in which concrete is filled in steel pipes and steel-framed beams have been known. Patent Document 1 listed below discloses a configuration in which a cover plate is attached to the column-beam joint, a connecting rebar is embedded that penetrates the column and the column-beam joint, and a concrete slab is provided on top of the beam. An anchoring portion is provided at the upper end of the connecting rebar, and the anchoring portion is anchored to the concrete of the concrete slab. This structure can provide a composite structure with excellent productivity while maintaining excellent bearing strength. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-11675 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the configuration of Patent Document 1 has the problem that it is difficult to position the connecting rebar within the connecting steel pipe, and it is difficult to fix the connecting rebar so that it does not shift when pouring concrete, resulting in poor workability.

[0005] Therefore, the present invention has been made in consideration of the above circumstances, and provides a column capital structure that allows the positioning of joining reinforcing bars. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention employs the following means. In other words, the column capital structure of the present invention comprises a connecting steel pipe formed in a cylindrical shape with the vertical direction as the axial direction, a plurality of connecting reinforcing bars arranged inside the connecting steel pipe and extending in the vertical direction, an upper installation portion provided on the upper part of the connecting steel pipe, a jig fixed to the upper installation portion, and a ring-shaped member fixed to the jig, and the fixing portion provided on the upper part of the connecting reinforcing bars is engaged with the ring-shaped member.

[0007] In the column capital structure configured in this way, the jig is fixed to the upper installation part. The annular member is fixed to the jig. The anchoring part provided at the top of the connecting rebar is engaged with the annular member. Therefore, the connecting rebar can be positioned in a position corresponding to the arrangement position of the annular member.

[0008] In the column capital structure according to the present invention, the annular member may be a hoop reinforcement.

[0009] In the column capital structure configured in this way, the annular members are hoops. Therefore, when the hoops are embedded in the concrete part of the slab, they can suppress cracks in the floor slab.

[0010] In the column capital structure according to the present invention, the annular member may be a pair of hoops arranged side by side above and below.

[0011] In this column capital structure, the annular members are a pair of hoops arranged side by side above and below each other. Therefore, when the pair of hoops is embedded in the concrete part of the slab, it is possible to further suppress cracks in the floor slab.

[0012] In addition, in the column capital structure of the present invention, the jig may have a fixing portion fixed to the upper surface of the upper installation portion, and a regulating portion erected from the fixing portion and regulating radial movement of the annular member.

[0013] In this column capital structure, the fixture is fixed to the upper surface of the upper installation part by the fixing part. The radial movement of the annular member is restricted by the restricting part, so the position of the connecting rebar can also be determined. Furthermore, by providing multiple jigs along the connecting steel pipe, it is possible to restrict the radial movement of the annular member in multiple directions. [Effects of the Invention]

[0014] According to the column capital structure of the present invention, the joining reinforcing bars can be positioned. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a plan view showing a column capital structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a perspective view showing the upper part of a column capital structure according to one embodiment of the present invention. [Figure 4] FIG. 1 is a perspective view showing the configuration of a jig and an annular member of a column capital structure according to an embodiment of the present invention. [Figure 5] FIG. 1 is a perspective view showing a jig for a column capital structure according to an embodiment of the present invention. [Figure 6] FIG. 10 is a plan view showing a column capital structure according to a modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a column capital structure according to one embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a plan view showing a column capital structure according to one embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. As shown in Figure 2, the column capital structure 100 (column capital of column 1) according to this embodiment is a structure in which a beam 2 and a floor slab 3 are joined. The column capital structure 100 is an external diaphragm type in which an upper diaphragm 41 and a lower diaphragm 42, which will be described later, are joined to the upper flange 21 and the lower flange 22 of the beam 2.

[0017] The column 1 is made of concrete-filled steel pipe. The column 1 has a steel pipe 11, a plurality of main reinforcements 12, and a concrete portion (not shown). The steel pipe 11 is formed in a cylindrical shape with the vertical direction as the axial direction. The main reinforcements 12 are arranged along the inner surface of the steel pipe 11. The main reinforcements 12 are arranged at intervals in the circumferential direction. The main reinforcements 12 extend in the vertical direction. In this embodiment, 24 main reinforcements 12 are arranged, but the number of main reinforcements 12 can be set appropriately. The inside of the steel pipe 11 is filled with concrete. The main reinforcements 12 are fixed to the concrete portion.

[0018] Beams 2 extending in two directions perpendicular to each other in a plan view are arranged on the pillars 1. The extending directions and number of beams 2 can be set as appropriate.

[0019] The beam 2 is made of an H-shaped steel and has an upper flange 21, a lower flange 22, and a web 23.

[0020] The upper flange 21 and the lower flange 22 are disposed so as to be spaced apart in the vertical direction. The upper flange 21 and the lower flange 22 are formed in a plate shape. The plate surfaces of the upper flange 21 and the lower flange 22 face in the vertical direction.

[0021] The web 23 connects the upper flange 21 and the lower flange 22. The web 23 is formed in a plate shape. The plate surface of the web 23 faces horizontally. Of the two orthogonal webs 23, 23, one web 23 is long, and the other web 23 is joined so as to be orthogonal to the long web 23.

[0022] The floor slab 3 has floor slab reinforcement 31 and a floor concrete portion (not shown). The floor slab reinforcement 31 is arranged above the beams 2. As shown in FIG. 1, the floor slab reinforcement 31 is arranged in a lattice pattern in plan view. In this embodiment, the extension direction of the floor slab reinforcement 31 is arranged parallel to the extension direction of the beams 2, which are perpendicular to each other. The floor slab reinforcement 31 is buried in the floor concrete portion.

[0023] As shown in FIG. 2, the column capital structure 100 includes a joint steel pipe 40, an upper diaphragm (upper installation portion) 41, a lower diaphragm 42, a joint reinforcing bar 44, a jig 50, and an annular member 60.

[0024] The joining steel pipe 40 is arranged above the steel pipe 11 at the height of the beam 2. The joining steel pipe 40 has four closing plate portions 40a. The closing plate portions 40a join the orthogonal webs 23. The four closing plate portions 40a form the joining steel pipe 40, which is approximately cylindrical and has an axial direction in the vertical direction. The joining steel pipe 40 is arranged coaxially with the steel pipe 11. The inner diameter of the joining steel pipe 40 is approximately the same as the inner diameter of the steel pipe 11.

[0025] The upper diaphragm 41 is provided at the upper end of the joined steel pipe 40. The lower diaphragm 42 is provided at the lower end of the joined steel pipe 40. The upper diaphragm 41 and the lower diaphragm 42 are provided so as to protrude outward from the outer circumferential surface of the joined steel pipe 40. As shown in FIG. 1, the outer circumferential shape of the upper diaphragm 41 and the lower diaphragm 42 is approximately rectangular with the apex facing the beam 2. A through hole is formed in the center of the upper diaphragm 41 and the lower diaphragm 42, penetrating in the vertical direction, and has a shape corresponding to the shape of the joined steel pipe 40. The upper diaphragm 41 and the lower diaphragm 42 are formed in a plate shape. The plate surfaces of the upper diaphragm 41 and the lower diaphragm 42 face in the vertical direction. The upper diaphragm 41 corresponds to the diaphragm in the claims.

[0026] 2, the upper diaphragm 41 is disposed at approximately the same height as the upper flange 21. The upper diaphragm 41 is joined to the upper flange 21. The lower diaphragm 42 is disposed at approximately the same height as the lower flange 22. The lower diaphragm 42 is joined to the lower flange 22.

[0027] The connecting rebars 44 are the upper parts of the main reinforcements 12. The connecting rebars 44 are the parts of the main reinforcements 12 that are placed inside the connecting steel pipes 40 and the parts that protrude above the connecting steel pipes 40.

[0028] FIG. 3 is a perspective view showing the upper part of the capital structure 100. As shown in Fig. 3, an anchoring portion 45 is provided at the upper end of the connecting rebar 44. In plan view, the anchoring portion 45 has a circular shape that is larger than the connecting rebar 44. In plan view, the anchoring portion 45 protrudes over the entire periphery beyond the connecting rebar 44. Note that at least a portion of the anchoring portion 45 may be configured to protrude beyond the connecting rebar 44 in plan view.

[0029] The jigs 50 are fixed to the upper surface 41u of the upper diaphragm 41. The jigs 50 are provided at positions above the outer edge of the joined steel pipe 40 and spaced apart in the circumferential direction. In this embodiment, the jigs 50 are provided at four locations at equal intervals.

[0030] Fig. 4 is a perspective view showing the configuration of the jig 50 and the annular member 60. Fig. 5 is a perspective view showing the jig 50. As shown in Figures 4 and 5, the jig 50 has a fixing portion 51 and a restricting portion 52. The fixing portion 51 is fixed to the upper surface 41u of the upper diaphragm 41 by a fixing means such as welding. The restricting portion 52 stands upright from the radial outside of the joined steel pipes 40 at the fixing portion 51. By arranging the restricting portion 52 radially outside of the joined steel pipes 40 at the fixing portion 51, a large installation area between the fixing portion 51 and the upper surface 41u of the upper diaphragm 41 can be secured, and the jig 50 can be stably installed above the upper surface 41u of the upper diaphragm 41. The fixing portion 51 and the restricting portion 52 form a substantially L-shape.

[0031] The annular member 60 has a pair of hoops 61. The hoops 61 are formed with approximately the same diameter as the joined steel pipes 40. The pair of hoops 61 are arranged side by side, one above the other. The lower hoop 61 is arranged above the fixing portion 51 of the jig 50. The upper hoop 61 is arranged above the lower hoop 61. As shown in FIG. 2, the pair of hoops 61 are engaged with the restricting portions 52 of the jig 50 and are fixed to the jig 50 in a state where their radial movement is restricted. Since four jigs 50 are provided at intervals around the circumferential direction of the joined steel pipes 40, the hoops 61 engaged with the restricting portions 52 are restricted from moving in any direction along the horizontal direction.

[0032] As shown in Figure 3, the anchoring portion 45 of the connecting rebar 44 is engaged with the upper hoop 61. This restricts the outward movement of the connecting rebar 44 in the radial direction. Multiple anchoring portions 45 are arranged in the circumferential direction. The connecting rebar 44 can be arranged in a predetermined position by arranging the anchoring portions 45 without gaps in the circumferential direction or by adjusting the spacing between adjacent anchoring portions 45 in the circumferential direction.

[0033] In the column capital structure 100 configured in this manner, the jig 50 is fixed to the upper diaphragm 41. The annular member 60 is fixed to the jig 50. The anchoring portion 45 provided on the upper part of the connecting rebar 44 is engaged with the annular member 60. Therefore, the connecting rebar 44 can be positioned in a position corresponding to the arrangement position of the annular member 60.

[0034] Moreover, the annular member 60 is a hoop 61. Therefore, when the hoop 61 is embedded in the floor concrete portion of the floor slab 3, cracks in the floor slab 3 can be suppressed.

[0035] The annular member 60 is a pair of hoops 61 arranged vertically. Therefore, when the pair of hoops 61 are embedded in the floor concrete portion of the floor slab 3, cracks in the floor slab 3 can be further suppressed.

[0036] Furthermore, the jig 50 is fixed to the upper surface 41u of the upper diaphragm 41 by the fixing portion 51. The restricting portion 52 restricts radial movement of the annular member 60, so the position of the joining reinforcing bar 44 can also be determined. Furthermore, by providing multiple jigs 50 along the joining steel pipe 40, it is possible to restrict multiple radial movements of the annular member 60.

[0037] Furthermore, when the connecting rebar 44 is positioned toward the center of the connecting steel pipe 40, the length of the fixing portion 51 of the jig 50 can be increased so that the fixing portion 51 protrudes toward the inside of the connecting steel pipe 40. By adjusting the radial position of the restricting portion 52 on the connecting steel pipe 40, the radial position of the connecting rebar 44 can be adjusted.

[0038] Furthermore, by adjusting the height of the annular member 60 where the anchoring portion 45 of the joining reinforcing bar 44 is positioned, the vertical position where the anchoring portion 45 is disposed can be adjusted.

[0039] (Variation) A column capital structure according to a modified example of one embodiment of the present invention will be described mainly with reference to Fig. 6. In the description of the embodiment shown below, the same members as those described above are given the same reference numerals, and their description will be omitted.

[0040] FIG. 6 is a plan view showing a column capital structure according to a modified example of an embodiment of the present invention. As shown in FIG. 6, the column capital structure 100A according to this modification is a beam penetration type in which the upper flange 21, the lower flange 22 and the web 23 of the beam 2 penetrate the inside of the joining steel pipe 40.

[0041] The upper flange 21, the lower flange 22 and the web 23 of the beam 2 extending in two directions perpendicular to each other in a plan view are joined together. The joined upper flange 21 and the web 23 form a cross shape in a plan view.

[0042] The fixing portion 51 of the jig 50 is fixed to the upper surface 21u of the upper flange (upper installation portion) 21. In the illustrated example, the regulating portion 52 of the jig 50 stands upright from the radially outer side of the joined steel pipes 40 at the fixing portion 51. Note that the regulating portion 52 may also stand upright from the radially inner side of the joined steel pipes 40 at the fixing portion 51.

[0043] In the column capital structure 100A configured in this manner, the jig 50 is fixed to the upper flange 21. A ring-shaped member 60 is fixed to the jig 50. An anchoring portion 45 provided on the upper part of the connecting rebar 44 is engaged with the ring-shaped member 60. Therefore, the connecting rebar 44 can be positioned in a position corresponding to the arrangement position of the ring-shaped member 60.

[0044] The installation surface for fixing the jig 50 is the upper surface 21u of the upper flange 21. Because a large installation surface is ensured, the fixing portion 51 of the jig 50 can be installed facing in any direction.

[0045] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0046] For example, in the embodiment described above, the fixing portion 45 protrudes beyond the connecting rebar 44 in a plan view, but is not limited to this. The fixing portion 45 may be formed in a hook shape so as to be able to be engaged with the annular member 60.

[0047] In the above embodiment, the upper flange 21 and the upper diaphragm 41 are used as examples of the upper installation portion, but this is not limited thereto. The upper installation portion may be provided on the upper part of the joined steel pipe and configured to allow the jig to be fixed thereto. The upper installation portion may be provided so as to extend radially from the upper part of the joined steel pipe only at the location where the jig is fixed.

[0048] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The column capital structure 100 according to this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 11, "Sustainable cities and communities." [Explanation of symbols]

[0049] 1 Column head structure 11 Steel pipe 21 Upper flange (upper installation part) 40 Jointed steel pipe 41 Upper diaphragm (upper installation part) 44 Bonded Reinforcement Bars 45 Fixing section 41 Upper diaphragm (diaphragm) 50 Jig 51 Fixed part 52 Regulatory Department 60 Annular member 61 Hoop Muscle 100 Column head structure

Claims

1. a joined steel pipe formed into a cylindrical shape with its axis extending in the vertical direction; A plurality of connecting reinforcing bars arranged inside the connecting steel pipe and extending in the vertical direction; an upper installation portion provided on an upper portion of the joined steel pipe; a jig fixed to the upper installation portion; an annular member fixed to the jig; A column capital structure in which the anchoring portion provided at the top of the connecting steel bar is engaged with the annular member.

2. The column capital structure according to claim 1 , wherein the annular member is a hoop reinforcement.

3. The column capital structure according to claim 1, wherein the annular member is a pair of hoop reinforcements arranged vertically side by side.

4. The jig is a fixing portion fixed to an upper surface of the upper installation portion; 3. The column capital structure according to claim 1, further comprising a restricting portion extending from the fixed portion and restricting radial movement of the annular member.

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