Column structure

Abstract

To provide a column structure which can be efficiently constructed while maintaining bending cross-sectional performance and shearing cross-sectional performance.SOLUTION: The column structure 1 includes steel tube parts 10 respectively arranged in an upper layer A1 and a lower layer A2, reinforced concrete parts 20 arranged outside the steel tube parts 10, and connection reinforcements 33 joined to the steel tube parts 10 of the upper layer A1 and the steel tube parts 10 of the lower layer A2. The steel pipe part 10 includes a steel pipe 11, a closing part 12, and a first cotter 13 provided on a lower surface of the closing part 12 of a lower end part of the steel pipe 11 of the upper layer A1 and an upper surface of the closing part 12 of an upper end part of the steel pipe 11 of the lower layer A2, respectively, and the reinforced concrete part 20 includes a plurality of column main reinforcements 21, a plurality of column band reinforcements, and a concrete part 22 embedding the connection reinforcements 33, the column main reinforcements 21, the column band reinforcements 22, and the first cotter 13.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, there have been cases where the efficiency of transportation and lifting has been improved by providing a hollow portion inside a precast reinforced concrete column member to reduce its weight.

[0003] A widely applied example is the half-precast construction method, in which the outer shell of the column is precast and concrete is poured into the hollow part after the column is erected on site.

[0004] The following Patent Document 1 discloses a technology in which the outer shell is made thin so that it functions only as a formwork, and a separately reinforced reinforcing cage is installed inside and concrete is poured. The following Patent Document 2 discloses a technology in which main reinforcement and ties are incorporated into precast members, eliminating the need for on-site reinforcement work and allowing concrete to be poured on-site. In both cases, the cross section becomes solid after construction, ensuring the same cross-sectional performance as conventional reinforced concrete members, while also offering the advantage of lighter weight for transporting and lifting the members during construction.

[0005] On the other hand, there is a method for making construction more efficient by omitting the pouring of concrete inside hollow column members.Patent Document 3 listed below discloses a technology in which column members are cut out with a predetermined thickness above and below the steel beams that penetrate the columns, and are placed between the columns as solid precast joints with beam joints, thereby enabling mutual stress transmission between the beam members and hollow column members. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 3225446 [Patent Document 2] Patent Publication No. 2022-89083 [Patent Document 3] Patent No. 7018712 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in Patent Documents 1 and 2, filling the hollow space with concrete after construction is necessary to prevent performance degradation due to cross-sectional loss, but this increases the number of on-site construction steps, which is inefficient. Patent Document 3 allows for connection to beam members while the column remains hollow, but it cannot compensate for the fundamental decline in cross-sectional performance due to cross-sectional loss of the column.

[0008] Therefore, the present invention has been made in consideration of the above circumstances, and provides a column structure that can be constructed efficiently while maintaining bending cross-sectional performance and shear cross-sectional performance. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention employs the following means. That is, the column structure according to the present invention comprises steel pipe sections arranged in the upper and lower stories, respectively, reinforced concrete sections arranged outside the steel pipe sections, and connecting reinforcing bars joined to the steel pipe section in the upper story and the steel pipe section in the lower story, wherein the steel pipe sections have steel pipes extending in the vertical direction, closing sections that close the upper and lower ends of the steel pipes, respectively, and first cotters provided on the lower surface of the closing section at the lower end of the steel pipe in the upper story and on the upper surface of the closing section at the upper end of the steel pipe in the lower story, respectively, and the reinforced concrete sections are arranged outside the steel pipes and include a plurality of column main reinforcements extending in the vertical direction, a plurality of column ties arranged at intervals in the vertical direction so as to surround the plurality of column main reinforcements, and a concrete section in which the connecting reinforcing bars, the column main reinforcements, the column ties, and the first cotters are embedded.

[0010] In a column structure constructed in this manner, the upper and lower ends of the steel pipes are closed with closed sections, and the steel pipes are not filled with concrete. This makes them lighter than solid-core columns, allowing for more efficient transportation and lifting. Furthermore, the process of pouring concrete into the steel pipes at the construction site is omitted, allowing for more efficient construction. Furthermore, because the column structure is a two-story structure consisting of upper and lower sections, columns for two stories can be constructed at once, shortening the column construction process. Furthermore, because the upper and lower steel pipes are joined by connecting rebars, and the connecting rebars and cotters are integrated by the concrete section, bending and shear cross-sectional performance can be maintained.

[0011] Furthermore, the column structure according to the present invention may include a first anchoring rebar that is joined to the steel pipe portion of the upper layer and protrudes upward from the top surface of the concrete portion.

[0012] In a column structure configured in this manner, the column structure can be structurally joined to the upper column by joining the anchoring rebar provided on the column installed above the column structure to the first anchoring rebar.

[0013] Furthermore, in the column structure according to the present invention, at least a portion of the first anchored reinforcing bar may be embedded in the concrete portion.

[0014] In the column structure configured in this manner, at least a portion of the first anchoring rebar is embedded in the concrete portion, so that the first anchoring rebar can be integrated with the concrete portion.

[0015] Furthermore, the column structure according to the present invention may include a second anchoring rebar that is joined to the steel pipe portion of the lower layer and protrudes downward from the underside of the concrete portion.

[0016] In a column structure configured in this manner, the column structure can be structurally joined to the lower column by joining the anchoring rebar provided on the column installed below the column structure to the second anchoring rebar.

[0017] Furthermore, in the column structure according to the present invention, at least a portion of the second anchoring reinforcing bar may be embedded in the concrete portion.

[0018] In the column structure configured in this manner, at least a portion of the second anchoring rebar is embedded in the concrete portion, so that the second anchoring rebar can be integrated with the concrete portion.

[0019] In addition, in the column structure of the present invention, the steel pipe section of the upper layer may be provided on the upper surface of the blocking section at the upper end of the steel pipe and may be provided with a second cotter protruding upward from the upper surface of the concrete section.

[0020] In a column structure configured in this way, the second cotter can be embedded in the concrete of the column installed above the column structure or in the filler material filled between the column, thereby improving the integration of the column structure with the upper column or filler material.

[0021] In addition, in the column structure of the present invention, the steel pipe section of the lower layer may be provided on the underside of the blocking portion of the lower end of the steel pipe and may be provided with a third cotter protruding downward from the underside of the concrete section.

[0022] In a column structure configured in this way, the third cotter can be embedded in the concrete of the column installed below the column structure or in the filler material filled between the column, thereby improving the integration of the column structure with the column or filler material below.

[0023] In addition, in the pillar structure according to the present invention, the cotter may be a steel plate joined to the closing portion.

[0024] In the column structure configured in this way, the cotter is a steel plate joined to the closure portion, which makes it easy to manufacture the cotter.

[0025] In addition, in the column structure according to the present invention, the connecting reinforcing bars may be joined to the outside of the steel pipes.

[0026] In the column structure constructed in this way, the connecting rebars are joined to the outside of the steel pipes, which makes it easy to fabricate the connecting rebars.

[0027] Furthermore, the column structure according to the present invention comprises a steel pipe section, a reinforced concrete section arranged on the outside of the steel pipe section, and anchoring steel bars joined so as to extend on both the top and bottom sides from the steel pipe section, wherein the steel pipe section has a steel pipe extending in the vertical direction and closing sections that close the top and bottom ends of the steel pipe, and the reinforced concrete section is arranged on the outside of the steel pipe and has a plurality of column main reinforcements extending in the vertical direction, a plurality of column tie reinforcements arranged at intervals in the vertical direction so as to surround the plurality of column main reinforcements, and a concrete section in which the column main reinforcements and the column tie reinforcements are embedded.

[0028] In a column structure constructed in this way, the upper and lower ends of the steel pipes are closed with closed sections, and the steel pipes are not filled with concrete. This makes them lighter than solid columns, allowing for more efficient transportation and lifting, and omitting the process of pouring concrete into the steel pipes at the construction site, allowing for more efficient construction. [Effects of the Invention]

[0029] The column structure according to the present invention can be constructed efficiently while maintaining bending cross-sectional performance and shear cross-sectional performance. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a vertical cross-sectional view showing a pillar structure according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5]1 is a vertical cross-sectional view showing an upper portion of a pillar structure according to a first embodiment of the present invention. FIG. [Figure 6] FIG. 4 is a diagram showing a joint structure according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] (First embodiment) Hereinafter, a pillar structure according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a pillar structure according to a first embodiment of the present invention. As shown in FIG. 1, the pillar structure 1 of this embodiment is composed of a single pillar member spanning two floors, an upper floor A1 and a lower floor A2, and a height portion B of the beam 5 between the upper floor A1 and the lower floor A2.

[0032] Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 1. The column structure 1 includes two steel pipe sections 10, a reinforced concrete section 20, anchoring rebars 31 and 32, and a connecting rebar 33. As shown in Figs. 2 to 4, the steel pipe section 10 is disposed in the center of the column structure 1 in a plan view. The reinforced concrete section 20 is disposed mainly outside the steel pipe section 10 in a plan view.

[0033] As shown in Fig. 1, the steel pipe sections 10 are arranged on the upper floor A1 and the lower floor A2, respectively. The two steel pipe sections 10 are arranged with a space S1 between them. The space S1 is at a position corresponding to the height B of the beam 5.

[0034] The steel pipe portion 10 has a steel pipe 11 , a closing portion 12 , and a cotter 13 .

[0035] The steel pipes 11 are arranged with their axes oriented in the vertical direction. The steel pipes 11 extend in the vertical direction. The length of the steel pipes 11 is shorter than the height of the upper layer A1 and the height of the lower layer A2. The length of the steel pipes 11 may be longer than the height of the upper layer A1 and the height of the lower layer A2. As shown in FIG. 3, the steel pipes 11 are approximately rectangular in plan view.

[0036] As shown in Figure 1, the closing portion 12 is provided at the upper and lower ends of the steel pipe 11. The closing portion 12 closes the upper and lower ends of the steel pipe 11. The closing portion 12 is formed in a plate shape. The plate surface of the closing portion 12 faces the vertical direction. As shown in Figure 2, the closing portion 12 has a substantially rectangular shape in a plan view. The closing portion 12 has a rectangular shape that is substantially the same as the outer edge shape of the steel pipe 11. The closing portion 12 is formed, for example, from a steel plate. The closing portion 12 is joined to the upper and lower ends of the steel pipe 11 by welding or the like. Note that the closing portion 12 may protrude laterally beyond the outer edge shape of the steel pipe 11.

[0037] The upper and lower ends of the steel pipe 11 are closed with the closed portions 12, thereby forming a hollow portion S2 inside the steel pipe 11. The hollow portion S2 is not filled with a filler material such as concrete.

[0038] The cotter 13 is provided on the upper surface of the closed portion 12 at the upper end of the steel pipe 11 and on the lower surface of the closed portion 12 at the lower end of the steel pipe 11.

[0039] FIG. 2 shows a cotter 13 provided on the upper surface 12u of the closure portion 12 at the upper end of the steel pipe 11. As shown in FIG. 2, the cotter 13 is formed in a plate shape. The plate surface of the cotter 13 faces the vertical direction. The cotter 13 is formed from, for example, a steel plate. The cotter 13 is joined to the upper surface 12u of the closure portion 12 by welding or the like. The cotter 13 protrudes upward from the upper surface 12u of the closure portion 12.

[0040] In the illustrated example, the cotter 13 has a substantially rectangular shape in plan view. The cotters 13 are provided at four locations spaced apart vertically and horizontally in plan view relative to the rectangular closure portion 12. The shape and number of the cotters 13 can be set as appropriate.

[0041] As shown in Fig. 1, cotters 13 are similarly provided at four locations on the underside of the closed portion 12 at the lower end of the steel pipe 11. In the closed portion 12 at the lower end of the steel pipe 11, the cotters 13 protrude downward from the underside of the closed portion 12.

[0042] The cotter 13 provided on the underside of the closed portion 12 at the lower end of the steel pipe 11 in the upper layer A1 corresponds to the first cotter in the claims. The cotter 13 provided on the upper surface of the closed portion 12 at the upper end of the steel pipe 11 in the lower layer A2 corresponds to the first cotter in the claims. The cotter 13 provided on the upper surface of the closed portion 12 at the upper end of the steel pipe 11 in the upper layer A1 corresponds to the second cotter in the claims. The cotter 13 provided on the underside of the closed portion 12 at the lower end of the steel pipe 11 in the lower layer A2 corresponds to the third cotter in the claims.

[0043] The reinforced concrete portion 20 has a plurality of column main reinforcements 21, a plurality of column tie reinforcements 22 (see FIG. 2), and a concrete portion 23.

[0044] The column main reinforcement 21 extends in the vertical direction. The column main reinforcement 21 is arranged over approximately the entire length of the column structure 1 in the vertical direction. The column main reinforcement 21 is composed of a single member over the vertical length of the column structure 1. Note that the column main reinforcement 21 may be joined midway through the column structure 1 in the vertical direction.

[0045] As shown in Fig. 3, the column main reinforcements 21 are arranged outside the steel pipes 11 in a plan view, with a gap between them. The column main reinforcements 21 are arranged along the outer edge of the column structure 1. In the illustrated example, 16 column main reinforcements 21 are arranged, but the number and arrangement positions can be set appropriately.

[0046] The column tie reinforcement 22 surrounds a plurality of column main reinforcements 21 in a plan view. The column tie reinforcement 22 is arranged on the outside of the steel pipe section 10 in a plan view. The column tie reinforcement 22 is arranged at intervals in the vertical direction. The column tie reinforcement 22 is arranged over substantially the entire length of the column structure 1 in the vertical direction. In Fig. 1, the column tie reinforcement 22 is not shown. Note that the column tie reinforcement 22 may be partially joined to the steel pipe 11.

[0047] The concrete portion 23 has a plurality of column main reinforcements 21 and a plurality of column tie reinforcements 22 embedded therein. The concrete portion 23 forms the outer surface of the column structure 1, which is substantially rectangular in plan view. The concrete portion 23 is not filled inside the steel pipe portion 10, but is filled outside the steel pipe portion 10.

[0048] As shown in Figure 1, the concrete portion 23 is also filled in the space S1. The cotters 13 provided in the closed portions 12 at the lower ends of the steel pipes 11 in the upper layer A1 and the cotters 13 provided in the closed portions 12 at the upper ends of the steel pipes 11 in the lower layer A2 are embedded in the concrete portion 23. By integrating the cotters 13 with the concrete portion 23, bending moments and shear forces can be transmitted.

[0049] The anchoring rebars 31 are provided so as to extend upward from the top of the steel pipes 11 arranged on the upper layer A1. As shown in FIG. 2, the anchoring rebars 31 are provided on the outside of the steel pipes 11. The lower parts of the anchoring rebars 31 are joined to the outer surface of the steel pipes 11 by welding or the like. The anchoring rebars 31 are provided at a total of eight locations, at the four corners and in the middle of each side of the steel pipes 11, which are approximately rectangular in plan view. The number and placement positions of the anchoring rebars 31 can be set as appropriate. The anchoring rebars 31 correspond to the first anchoring rebar in the claims.

[0050] As shown in FIG. 1 , the anchoring rebars 32 are arranged to extend downward from the lower part of the steel pipes 11 arranged on the lower layer A2. The anchoring rebars 32 are arranged on the outside of the steel pipes 11. The upper parts of the anchoring rebars 32 are joined to the outer surface of the steel pipes 11 by welding or the like. The anchoring rebars 32 are arranged at a total of eight locations, at the four corners and in the middle of each side of the steel pipes 11, which are approximately rectangular in plan view. The number and placement positions of the anchoring rebars 32 can be set as appropriate. The anchoring rebars 32 correspond to the second anchoring rebar in the claims.

[0051] The connecting rebars 33 are provided across the lower part of the steel pipes 11 arranged in the upper layer A1 and the upper part of the steel pipes 11 arranged in the lower layer A2. The connecting rebars 33 are provided on the outside of the steel pipes 11. The upper part of the connecting rebars 33 is joined by welding or the like to the outer peripheral surface of the steel pipes 11 arranged in the upper layer A1. The lower part of the connecting rebars 33 is joined by welding or the like to the outer peripheral surface of the steel pipes 11 arranged in the lower layer A2. The connecting rebars 33 are embedded in the concrete section 23. The connecting rebars 33 are provided at a total of eight locations, at the four corners and midpoints of each side of the steel pipe 11, which is approximately rectangular in plan view. The number and placement positions of the connecting rebars 33 can be set as appropriate. By joining the upper and lower steel pipe sections 10 with the connecting rebars 33, bending moments can be transmitted.

[0052] FIG. 5 is a vertical cross-sectional view showing the upper part of the pillar structure 1. 5, at the upper part of the column structure 1, the lower part of the anchoring reinforcing bars 31 is embedded in the concrete part 23. The upper end parts 21u of the column main reinforcement bars 21, the upper end parts 31u of the anchoring reinforcing bars 31, and the cotter 13 protrude upward from the upper surface 23u of the concrete part 23.

[0053] As shown in Fig. 1, in the lower part of the column structure 1, the upper part of the anchoring rebar 32 is embedded in the concrete part 23. The lower end part 21d of the column main reinforcement 21, the lower end part 32d of the anchoring rebar 32, and the cotter 13 protrude downward from the lower surface 23d of the concrete part 23.

[0054] The column main reinforcements 21 and anchoring rebars 31 protruding upward from the upper surface 23u of the concrete section 23 are joined via joint members 41 to the column main reinforcements 21 and anchoring rebars 32 protruding downward from the lower surface 23d of the concrete section 23 of the column structure 1 arranged above. The joint members 41 can be used in any of a variety of ways, including pouring concrete after connecting the joints, or grouting the joints in sheath pipes and mechanical joints built into the precast members.

[0055] The cotters 13 provided at the closed portions 12 at the upper ends of the steel pipes 11 in the upper layer A1 are embedded in the filler material 42 filled between the steel pipes 11 and the beams 5. The cotters 13 provided at the closed portions 12 at the lower ends of the steel pipes 11 in the lower layer A2 are embedded in the filler material 42 filled between the steel pipes 11 and the beams 5.

[0056] At a height portion B of the beam 5 of the column structure 1, the beam main reinforcement 51 protrudes from the side surface of the concrete portion 23. The beam main reinforcement 51 is joined to the main reinforcement of the beam 5 via a joint member 52.

[0057] Next, we will show the estimated weight of the components. Assume a standard high-rise RC building (60 stories) that uses precast construction. With a floor height of 3.2 m and a beam depth of 0.8 m, the total length of the member is 5.6 (= 3.2 x 2 - 0.8) m. The cross section is 1.0 m x 1.0 m, and the unit weight is 2.5 ton / m 3 Let's say.

[0058] If a conventional solid structure is used, the component weight will be 14t (=5.6m x 1.0m x 1.0m x 2.5t / m 3 ) In addition, the weight of the main reinforcement that protrudes to secure the components to other components and the weight of accessories such as fixing jigs for transport are added. As the maximum load capacity of a large 15-ton vehicle typically used for transportation is about 14.3 tons, it is difficult to transport the above components by ordinary vehicle.

[0059] On the other hand, in the column structure 1 according to this embodiment, the internal steel pipe portion 10 (steel column) has a cross section of H×B=550 mm×550 mm and a plate thickness of t=16 mm. By making it hollow, the weight of the RC portion is reduced by 3.6 t (=0.55 m×0.55 m×2.4 m×2.5 t / m 3 × 2). The weight of the steel column is 1.3 t (= length 2.4 m × unit weight 0.26 t / m 3 x 2 places), and even when taking into account the blocking portion 12 (blocking steel plate) etc., it is less than 1.6t. As mentioned above, the weight if it were solid would be 14t, so the weight of the components after weight reduction will be less than 12t (=14t-3.6t+1.6t). Even taking into account various additional weights, it is expected to be less than the maximum load capacity of a 15-ton vehicle, which is 14.3t.

[0060] Next, we will estimate the axial force retention performance of the column member. The cross-sectional area of ​​concrete reduced by using a hollow cross section is 302,500 mm 2 (=550mm x 550mm). On the other hand, the cross-sectional area of ​​the steel column is 32860mm according to the catalogue value. 2 If the concrete strength of the lower floors of a high-rise RC building is assumed to be Fc60, the elastic modulus ratio of the steel material is 9 (according to the RC standard), so the cross-sectional area of ​​the steel column can be converted to the cross-sectional area of ​​concrete to be 32,860 mm 2 x9=295740mm 2 Comparing the two, 295740 / 302500 = 0.98, it can be said that the cross-sectional performance is almost the same before and after hollowing.

[0061] In the column structure 1 configured in this manner, the upper and lower ends of the steel pipe 11 are closed with closed sections 12, and the steel pipe 11 is not filled with concrete 23. Therefore, it is lighter than a column with a solid structure, allowing for efficient transportation and lifting, and construction can be carried out efficiently by omitting the process of pouring concrete into the steel pipe at the construction site. Furthermore, because the column structure 1 is a member spanning two layers, the upper layer A1 and the lower layer A2, columns for two layers can be constructed at once, thereby shortening the column construction process.

[0062] Furthermore, the upper and lower steel pipes 11 are joined by the connecting reinforcing bars 33, and the connecting reinforcing bars 33 and the cotters 13 are integrated by the concrete portion 23, thereby maintaining bending cross-sectional performance and shear cross-sectional performance.

[0063] Furthermore, by joining the anchoring rebar 31 of the column structure 1 to the anchoring rebar 32 of the column structure 1 installed above, the upper and lower column structures 1 can be structurally joined.

[0064] In addition, the lower part of the anchoring reinforcing bar 31 of the column structure 1 is buried in the concrete portion 23. Therefore, the anchoring reinforcing bar 31 can be integrated with the concrete portion 23.

[0065] Furthermore, by joining the anchoring rebar 32 of the column structure 1 to the anchoring rebar 31 of the column structure 1 arranged below, the upper and lower column structures 1 can be structurally joined.

[0066] Furthermore, the upper part of the anchoring reinforcing bar 32 of the column structure 1 is embedded in the concrete portion 23. Therefore, the anchoring reinforcing bar 32 can be integrated with the concrete portion 23.

[0067] In addition, the cotters 13 provided on the upper side and the cotters 13 provided on the lower side of the pillar structure 1 are embedded in the filler material 42 on site. Therefore, the integration between the pillar structure 1 and the filler material 42 can be improved.

[0068] Furthermore, the cotter 13 is a steel plate joined to the closing portion 12. Therefore, the cotter 13 can be easily manufactured.

[0069] Additionally, the anchoring reinforcing bars 31, 32 and the connecting reinforcing bars 33 are joined to the outside of the steel pipe 11. Therefore, the anchoring reinforcing bars 31, 32 and the connecting reinforcing bars 33 can be easily manufactured.

[0070] Furthermore, by not filling the inside of the steel pipe 11 of the column structure 1 with concrete 23, the weight of the column structure 1 and therefore the building frame can be reduced, thereby reducing external forces acting during an earthquake.

[0071] Furthermore, by constructing two stories of the column structure 1 at once, the number of times components are transported and lifted can be reduced, thereby reducing the environmental impact.

[0072] (Second embodiment) Next, a pillar structure according to a second embodiment of the present invention will be described mainly with reference to Fig. 6. In the following description of the embodiment, the same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and their description will be omitted, and only configurations different from the embodiment will be described.

[0073] FIG. 6 is a diagram showing a joint structure according to a second embodiment of the present invention. As shown in Fig. 6, the column structure 1A according to this embodiment is installed only on one layer of story A. The column structure 1A includes one steel pipe section 10, a reinforced concrete section 20, and anchoring reinforcing bars 31 and 32.

[0074] The anchoring rebar 31 is provided so as to extend upward from the upper part of the steel pipe 11. The anchoring rebar 31 is provided on the outside of the steel pipe 11. The lower part of the anchoring rebar 31 is joined to the outer peripheral surface of the steel pipe 11 by welding or the like.

[0075] The anchoring rebar 32 is provided so as to extend downward from the lower part of the steel pipe 11. The anchoring rebar 32 is provided on the outside of the steel pipe 11. The upper part of the anchoring rebar 32 is joined to the outer peripheral surface of the steel pipe 11 by welding or the like.

[0076] In the column structure 1 configured in this manner, the upper and lower ends of the steel pipe 11 are closed with the closing sections 12, and the inside of the steel pipe 11 is not filled with concrete 23. Therefore, it is lighter than a column with a solid structure, allowing for efficient transportation and lifting, and also omitting the step of pouring concrete into the steel pipe at the construction site, allowing for efficient construction.

[0077] Furthermore, the upper and lower steel pipes 11 are joined by anchoring reinforcing bars 31, 32, and the cotter 13 is integrated with the concrete portion 23, so that bending cross-sectional performance and shear cross-sectional performance can be maintained.

[0078] 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.

[0079] For example, in the embodiment shown above, the anchoring rebars 31, 32 and the connecting rebar 33 are joined to the outer circumferential surface of the steel pipe 11, but this is not limited thereto. They may be joined to the closing section 12 provided at the upper and lower ends of the steel pipe 11 and configured to extend upward and downward from the closing section 12. Also, the anchoring rebars 31, 32 and the connecting rebar 33 may be provided on the inner circumferential surface of the steel pipe 11 and configured to extend upward and downward from a through hole formed in the closing section 12.

[0080] In the first embodiment, the anchoring rebars 31, 32 and the connecting rebar 33 are divided into three in the longitudinal direction of the column structure 1, but this is not limited to this. It may be composed of a single connecting rebar that is continuous in the longitudinal direction of the column structure 1. The connecting rebar may be configured so that its upper end protrudes from the upper surface 23u of the concrete portion 23, its middle part in the vertical direction joins the steel pipe 11 in the upper story A1 and the steel pipe 11 in the lower story A2, and its lower end protrudes from the lower surface 23d of the concrete portion 23.

[0081] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The pillar structure 1 according to this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 9, "Build resilient infrastructure, promote inclusive and sustainable industrialization, and foster innovation." [Explanation of symbols]

[0082] 1,1A pillar structure 10 Steel pipe section 11 Steel pipe 12 Occlusion 13 Cotter 20 Reinforced concrete section 21 Column main reinforcement 22 Column reinforcement 23 Concrete Section 31 Anchorage rebar (first anchorage rebar) 32 Anchorage rebar (second anchorage rebar) 33 Connecting rebar A1 upper layer A2 lower layer S1 space

Claims

1. Steel pipe portions disposed on the upper and lower layers, respectively; a reinforced concrete portion arranged outside the steel pipe portion; a connecting reinforcing bar joined to the steel pipe portion of the upper layer and the steel pipe portion of the lower layer, The steel pipe portion is A steel pipe extending in the vertical direction; Closure portions that close the upper and lower ends of the steel pipe, respectively; a first cotter provided on a lower surface of the closed portion at the lower end of the steel pipe in the upper layer and on an upper surface of the closed portion at the upper end of the steel pipe in the lower layer, The reinforced concrete portion is A plurality of column main reinforcements arranged outside the steel pipe and extending in the vertical direction; A plurality of column tie reinforcements are provided at intervals in the vertical direction so as to surround the plurality of column main reinforcements; A column structure having a concrete section in which the connecting steel bars, the column main reinforcement bars, the column tie bars, and the first cotter are embedded.

2. 2. A column structure as described in claim 1, further comprising a first anchoring reinforcing bar joined to the steel pipe section of the upper layer and protruding upward from the top surface of the concrete section.

3. The column structure according to claim 2 , wherein at least a portion of the first anchoring rebar is embedded in the concrete portion.

4. 3. A column structure as described in claim 1 or 2, further comprising a second anchoring rebar joined to the steel pipe section of the lower layer and protruding downward from the underside of the concrete section.

5. The column structure according to claim 4 , wherein at least a portion of the second anchoring rebar is embedded in the concrete portion.

6. A column structure as described in claim 1 or 2, wherein the steel pipe section of the upper layer is provided on the upper surface of the closing section at the upper end of the steel pipe and is provided with a second cotter protruding upward from the upper surface of the concrete section.

7. A column structure as described in claim 1 or 2, wherein the steel pipe section of the lower layer is provided on the underside of the closing portion of the lower end of the steel pipe and is provided with a third cotter protruding downward from the underside of the concrete section.

8. The column structure according to claim 1 or 2, wherein the cotter is a steel plate joined to the closing portion.

9. The column structure according to claim 1 or 2, wherein the connecting reinforcing bars are joined to the outside of the steel pipes.

10. A steel pipe section, a reinforced concrete portion arranged outside the steel pipe portion; and an anchoring reinforcing bar joined so as to extend from the steel pipe portion on both the upper and lower sides, The steel pipe portion is A steel pipe extending in the vertical direction; and closing portions that close the upper and lower ends of the steel pipe, The reinforced concrete portion is A plurality of column main reinforcements arranged outside the steel pipe and extending in the vertical direction; A plurality of column tie reinforcements are provided at intervals in the vertical direction so as to surround the plurality of column main reinforcements; A column structure having a concrete section in which the column main reinforcement and the column tie reinforcement are embedded.

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