Column-slab joint structure

Abstract

To provide a column-slab joint structure that enables simplification of the structure and improvement of constructability. [Solution] The column slab joint structure according to the present invention comprises a reinforced concrete slab and upper floor columns and lower floor columns separated by the reinforced concrete slab, wherein the reinforced concrete slab is joined to the upper floor columns and lower floor columns by a joint member made of precast reinforced concrete, at least one of the upper floor columns and lower floor columns has a recess on its end face, and the joint member has a protrusion that fits into the recess.

Description

Technical Field

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[0001] The present invention relates to a column-slab joint structure.

Background Art

[0002] Conventionally, a building including a column-beam framework and a concrete slab placed on the beam of this column-beam framework has been known. In such a building, a beam protrudes below the concrete slab. On the other hand, Patent Document 1 describes a column-slab joint structure that joins a column and a slab without providing such a beam. The column-slab joint structure described in Patent Document 1 includes a concrete-filled steel tube column in which concrete is filled in a steel tube, and a concrete slab in which a support plate is formed around the concrete-filled steel tube column.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0005] However, the column-slab joint structure described in Patent Document 1 still has room for improvement in terms of simplifying the structure and improving constructability.

[0006] The present invention aims to provide a column-slab joint structure that can achieve simplified construction and improved workability. [Means for solving the problem]

[0007] A column slab joint structure as a first aspect of the present invention is, (1) Reinforced concrete slab and It comprises upper and lower floor columns separated by the aforementioned reinforced concrete slab, The reinforced concrete slab is equipped with joint members made of precast reinforced concrete that are connected to the upper floor columns and the lower floor columns. At least one of the upper floor columns and the lower floor columns is provided with a recess on its end face. The aforementioned joint member is a column-slab joint structure having a protrusion that fits into the recess.

[0008] One embodiment of the present invention is a column slab joint structure, (2) The aforementioned joint member comprises a joint body portion on which the protrusion is provided, The column slab joint structure described in (1) above is such that at least one of the columns is joined to the joint member such that the protrusion fits into the recess and the edge of the recess abuts against the joint body.

[0009] One embodiment of the present invention is a column slab joint structure, (3) The main body of the joint is a flat plate portion, which is the column slab joint structure described in (2) above.

[0010] One embodiment of the present invention is a column slab joint structure, (4) The column slab joint structure according to any one of (1) to (3) above, comprising grout interposed between the recess and the protrusion.

[0011] One embodiment of the present invention is a column slab joint structure, (5) The column slab joint structure is one of the above (1) to (4), comprising a steel bar member that extends vertically and is connected to at least one of the columns and the joint member.

[0012] One embodiment of the present invention is a column slab joint structure, (6) The joint member has an insertion hole formed in the outer surface of the protrusion into which the steel bar member is inserted. The column slab joint structure described in (5) above, comprising grout interposed between the inner surface of the joint member that partitions the insertion hole and the side surface of the steel bar member.

[0013] One embodiment of the present invention is a column slab joint structure, (7) The aforementioned steel bar member is a column slab joint structure as described in (6) above, having a projection on its side surface.

[0014] One embodiment of the present invention is a column slab joint structure, (8) The aforementioned upper floor column is provided with a first recess on its lower end surface that opens downward, The lower floor column described above has a second recess on its upper end surface that opens upward, The aforementioned joint member is, A first convex portion that protrudes upward and fits into the first recess, The column slab joint structure according to any one of (1) to (7) above, comprising a second protrusion that protrudes downward and fits into the second recess. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a column-slab joint structure capable of realizing simplification of the structure and improvement of the workability.

Brief Description of the Drawings

[0016] [Figure 1] It is a figure which shows the column-slab joint structure as one Embodiment of this invention.

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the column-slab joint structure according to the present invention will be exemplarily described with reference to the drawings. The same components are denoted by the same reference numerals in each figure.

[0018] FIG. 1 is a view showing a column-slab joint structure 100 as an embodiment of the column-slab joint structure according to the present invention. As shown in FIG. 1, the column-slab joint structure 100 includes a reinforced concrete slab 10, an upper floor column 20 and a lower floor column 30 that are divided by the reinforced concrete slab 10.

[0019] As shown in FIG. 1, the reinforced concrete slab 10 includes an opening member 11 made of precast reinforced concrete, which is joined to the upper floor column 20 and the lower floor column 30.

[0020] As shown in FIG. 1, at least one of the upper floor column 20 and the lower floor column 30 has a recess 40 on the end face. Specifically, in the present embodiment, each of the upper floor column 20 and the lower floor column 30 has a recess 40 on the end face. More specifically, the upper floor column 20 of the present embodiment has a first recess 20a1 as a recess 40 that opens downward on the lower end face 20a. Further, the lower floor column 30 of the present embodiment has a second recess 30a1 as a recess 40 that opens upward on the upper end face 30a.

[0021] As shown in Figure 1, the joint member 11 has a protrusion 50 that fits into the recess 40. Specifically, the joint member 11 of this embodiment has a first protrusion 13a that protrudes upward and a second protrusion 13b that protrudes downward.

[0022] As shown in Figure 1, the first protrusion 13a is fitted into the first recess 20a1 of the upper floor column 20. The second protrusion 13b is fitted into the second recess 30a1 of the lower floor column 30.

[0023] In this column-slab joint structure 100, the reinforced concrete slab 10 is equipped with a joint member 11 made of precast reinforced concrete. In the column-slab joint structure 100, a first recess 20a1, which is a recess 40 formed on the lower end surface 20a of the upper floor column 20, and a first protrusion 13a, which is a protrusion 50 of the joint member 11, are fitted together. In such a column-slab joint structure 100, the reinforced concrete slab 10 and the upper floor column 20 transmit vertical loads by punching shear (punching shear force). By constructing the joint member 11 to which the upper floor column 20 is joined from precast reinforced concrete, a joint member 11 with increased punching resistance can be easily realized. Furthermore, constructing the joint member 11 from precast reinforced concrete also improves on-site constructability. Furthermore, the reinforced concrete slab 10 and the upper floor column 20 can transmit horizontal loads through the fitting of the first recess 20a1 and the first protrusion 13a. In other words, the shear force of the upper floor column 20 is transmitted to the reinforced concrete slab 10 through the fitting of the first recess 20a1 and the first protrusion 13a. Thus, in the column-slab joint structure 100, the transmission of vertical and horizontal loads between the reinforced concrete slab 10 and the upper floor column 20 can be achieved through a simplified and highly constructable configuration, a so-called "slab-dominant" design in which the upper floor column 20 and the lower floor column 30 are vertically separated by the reinforced concrete slab 10.

[0024] Furthermore, in the column-slab joint structure 100, a second recess 30a1, which is a recess 40 formed on the upper end surface 30a of the lower floor column 30, and a second protrusion 13b, which is a protrusion 50 of the joint member 11, are fitted together. In such a column-slab joint structure 100, the reinforced concrete slab 10 and the lower floor column 30 transmit vertical loads by punching shear (punching shear force). By constructing the joint member 11 to which the lower floor column 30 is joined from precast reinforced concrete, a joint member 11 with increased punching resistance can be easily realized. In addition, constructing the joint member 11 from precast reinforced concrete improves on-site constructability. Furthermore, the reinforced concrete slab 10 and the lower floor column 30 can transmit horizontal loads through the fitting of the second recess 30a1 and the second protrusion 13b. In other words, the shear force of the lower floor column 30 is transmitted to the reinforced concrete slab 10 by the fitting of the second recess 30a1 and the second protrusion 13b. In this way, the column-slab joint structure 100 enables the transmission of vertical and horizontal loads between the reinforced concrete slab 10 and the lower floor column 30 through a simplified and highly constructable configuration, known as a "slab-dominant" design, in which the upper floor column 20 and the lower floor column 30 are vertically separated by the reinforced concrete slab 10.

[0025] In this embodiment, as described above, both the upper floor column 20 and the lower floor column 30 are joined to the joint member 11 of the reinforced concrete slab 10 by a similar configuration using the recess 40 and the protrusion 50, but the embodiment is not limited to this configuration. Only one of the upper floor column 20 or the lower floor column 30 may be joined to the joint member 11 of the reinforced concrete slab 10 by a configuration using the recess 40 and the protrusion 50. However, it is preferable, as in this embodiment, that both the upper floor column 20 and the lower floor column 30 are joined to the joint member 11 of the reinforced concrete slab 10 by a similar configuration using the recess 40 and the protrusion 50. By doing so, the column-slab joint structure 100 can be made simpler and easier to construct.

[0026] Further details of the column slab joint structure 100 of this embodiment will be described below with reference to Figure 1.

[0027] The reinforced concrete slab 10 of this embodiment comprises a joint member 11 made of precast reinforced concrete and a slab body 14 made of cast-in-place reinforced concrete that is joined to the joint member 11. The joint member 11 and the slab body 14 may be joined using, for example, a mechanical joint. The end face of the joint member 11 that is joined to the slab body 14 may be provided with a recess, for example, a cotter 12a. The joint member 11 is formed with a predetermined strength in order to increase the punching resistance described above. The joint member 11 may be made stronger than the slab body 14, for example. The joint member 11 may be made stronger than the slab body 14 by, for example, increasing the concrete strength.

[0028] The joint member 11 of this embodiment includes a joint body portion 12 on which a protrusion 50 is provided. More specifically, the first protrusion 13a, which is the protrusion 50, protrudes upward from the joint body portion 12. The second protrusion 13b, which is the protrusion 50, protrudes downward from the joint body portion 12.

[0029] The joint body portion 12 in this embodiment is a flat plate portion. In other words, the joint body portion 12 in this embodiment does not have a support plate formed by thickening the upper floor column 20 and the lower floor column 30 to increase punching resistance at the joint location. The joint body portion 12 may be configured to have a support plate, but it is preferable to have a flat plate portion without a support plate, as in this embodiment. This makes the column slab joint structure 100 simpler. In particular, as shown in Figure 1, it is preferable that the thickness T1 of the flat plate portion as the joint body portion 12 is approximately equal to the thickness T2 of the slab body 14 joined to the joint body portion 12. In this way, the reinforced concrete slab 10 in this embodiment can be formed with a uniform thickness except for the location where the above-mentioned protrusions 50 are provided, and the structure of the reinforced concrete slab 10 can be simplified.

[0030] The upper floor column 20 in this embodiment is a steel column. Specifically, the upper floor column 20 in this embodiment comprises a steel pipe section 21 extending in the vertical direction and a steel plate section 22 located inside the steel pipe section 21 at the lower end of the steel pipe section 21. In this embodiment, the steel pipe section 21 and the steel plate section 22 form a first recess 20a1 that opens downward. The cross-sectional outer shape of the steel pipe section 21 is not particularly limited. The steel pipe section 21 may be, for example, a round steel pipe or a square steel pipe.

[0031] However, the upper floor column 20 is not particularly limited as long as it has a configuration in which a first recess 20a1 is provided on its lower end surface 20a that fits with the first protrusion 13a of the joint member 11. In other words, the upper floor column 20 is not limited to a steel column. The upper floor column 20 may be made of, for example, a concrete-filled steel pipe in which concrete is filled in the space above the steel plate portion 22 within the steel pipe portion 21. However, as in this embodiment, it is preferable that the first recess 20a1 is formed by the steel pipe portion 21 and the steel plate portion 22. By doing so, the first recess 20a1 can be easily formed, and the column slab joint structure 100 can be further simplified.

[0032] The lower floor column 30 of this embodiment has the same configuration as the upper floor column 20 described above. Specifically, the lower floor column 30 of this embodiment is a steel column. Specifically, the lower floor column 30 of this embodiment comprises a steel pipe section 31 extending in the vertical direction and a steel plate section 32 located inside the steel pipe section 31 at the upper end of the steel pipe section 31. The lower floor column 30 of this embodiment forms a second recess 30a1 that opens upward by the steel pipe section 31 and the steel plate section 32. The cross-sectional outer shape of the steel pipe section 31 is not particularly limited. The steel pipe section 31 may be, for example, a round steel pipe or a square steel pipe.

[0033] However, the lower floor column 30 is not particularly limited as long as it has a configuration in which a second recess 30a1 is provided on its upper end surface 30a that fits with the second protrusion 13b of the joint member 11. In other words, the lower floor column 30 is not limited to a steel column. The lower floor column 30 may be made of, for example, a concrete-filled steel pipe in which concrete is filled in the space below the steel plate portion 32 inside the steel pipe portion 31. However, as in this embodiment, it is preferable that the second recess 30a1 is formed by the steel pipe portion 31 and the steel plate portion 32. By doing so, the second recess 30a1 can be easily formed, and the column slab joint structure 100 can be further simplified.

[0034] Furthermore, as shown in Figure 1, in this embodiment, the upper floor column 20 and the lower floor column 30 are joined to the joint member 11 with the protrusion 50 fitted into the recess 40 and the edge of the recess 40 abutting against the joint body 12. Specifically, in this embodiment, the upper floor column 20 is joined to the joint member 11 with the first protrusion 13a fitted into the first recess 20a1 and the edge 20a2 of the first recess 20a1 abutting against the joint body 12. In this embodiment, the lower floor column 30 is joined to the joint member 11 with the second protrusion 13b fitted into the second recess 30a1 and the edge 30a2 of the second recess 30a1 abutting against the joint body 12. In this way, the vertical loads acting on the joint member 11 from the upper floor column 20 and the lower floor column 30 can be borne by the joint body portion 12 of the joint member 11.

[0035] As shown in Figure 1, the column-slab joint structure 100 of this embodiment includes grout 60 interposed between a recess 40 and a protrusion 50. More specifically, the column-slab joint structure 100 of this embodiment includes a first grout 60a interposed between a first protrusion 13a of the joint member 11 and a first recess 20a1 of the upper floor column 20, and a second grout 60b interposed between a second protrusion 13b of the joint member 11 and a second recess 30a1 of the lower floor column 30. The interposition of grout 60 between the recess 40 and the protrusion 50 suppresses the relative horizontal movement of the upper floor column 20 and the lower floor column 30 relative to the joint member 11. This enables the transmission of horizontal loads between the joint member 11 and the upper floor column 20 and the lower floor column 30, respectively. The grout 60 may be a cement-based grout material such as non-shrink mortar. The width of the gap X between the recess 40 and the protrusion 50 may be set appropriately from the viewpoint of ease of installation when fitting the recess 40 and the protrusion 50 together, and ease of filling the entire gap X with grout material.

[0036] As shown in Figure 1, the joint member 11 of this embodiment has an insertion hole 11a that opens on the outer surface of the protrusion 50 and into which a steel bar member 70, described later, can be inserted. The insertion hole 11a of this embodiment penetrates the joint member 11 in the vertical direction. The upper end of the insertion hole 11a of this embodiment opens on the upper surface of the first protrusion 13a. The lower end of the insertion hole 11a of this embodiment opens on the lower surface of the second protrusion 13b. In other words, the insertion hole 11a of this embodiment connects the first gap X1 between the first protrusion 13a of the joint member 11 and the first recess 20a1 of the upper floor column 20, and the second gap X2 between the second protrusion 13b of the joint member 11 and the second recess 30a1 of the lower floor column 30. Furthermore, the steel pipe section 31 forming the second recess 30a1 of this embodiment has an injection port 31a into which grout material can be injected into the second gap X2. Furthermore, the steel pipe section 21 forming the first recess 20a1 of this embodiment has an outlet 21a that allows air to be discharged from the first gap X1. Therefore, by injecting grout material from the injection port 31a, the grout material can be filled into the second gap X2, and the grout material can also be filled into the first gap X1 through the insertion hole 11a. At this time, the air in the first gap X1, the second gap X2, and the insertion hole 11a is discharged through the outlet 21a. In other words, with the column slab joint structure 100 of this embodiment, the first grout 60a located in the first gap X1 and the second grout 60b located in the second gap X2 can be installed simultaneously. This further improves workability.

[0037] Furthermore, as shown in Figure 1, the column-slab joint structure 100 of this embodiment includes a steel bar member 70 that extends vertically and is connected to at least one of the upper floor column 20 and the lower floor column 30 and the joint member 11. The steel bar member 70 may be, for example, a threaded reinforcing bar. More specifically, the column-slab joint structure 100 of this embodiment includes a first steel bar member 70a connected to the upper floor column 20 and the joint member 11, and a second steel bar member 70b connected to the lower floor column 30 and the joint member 11. The provision of the first steel bar member 70a suppresses the relative vertical movement of the joint member 11 and the upper floor column 20. In other words, the first steel bar member 70a suppresses the movement of the upper floor column 20 in the pulling direction relative to the joint member 11. Furthermore, the provision of the second steel bar member 70b suppresses the relative vertical movement of the joint member 11 and the lower floor column 30. In other words, the second steel bar member 70b suppresses the movement of the lower floor column 30 in the pulling direction relative to the joint member 11.

[0038] As shown in Figure 1, the steel bar member 70 is inserted into the insertion hole 11a of the joint member 11. Specifically, a portion of the lower side of the first steel bar member 70a in this embodiment is inserted into the insertion hole 11a. A portion of the upper side of the first steel bar member 70a in this embodiment protrudes upward from the insertion hole 11a. Also, a portion of the upper side of the second steel bar member 70b in this embodiment is inserted into the insertion hole 11a. A portion of the lower side of the second steel bar member 70b in this embodiment protrudes downward from the insertion hole 11a.

[0039] In this embodiment, the steel bar member 70 is connected to the joint member 11 while inserted into the insertion hole 11a of the joint member 11. Specifically, in this embodiment, the first steel bar member 70a is connected to the joint member 11 with a portion of its lower side inserted into the insertion hole 11a. Similarly, in this embodiment, the second steel bar member 70b is connected to the joint member 11 with a portion of its upper side inserted into the insertion hole 11a. The column-slab joint structure 100 of this embodiment includes grout 80 interposed between the inner surface that demarcates the insertion hole 11a of the joint member 11 and the side surface of the steel bar member 70. More specifically, in the column-slab joint structure 100 of this embodiment, the grout 80 is located around the entire area surrounding the first steel bar member 70a and the second steel bar member 70b within the insertion hole 11a. In other words, the first steel bar member 70a and the second steel bar member 70b of this embodiment are connected to the joint member 11 via grout 80 in the insertion hole 11a. As described above, in the column slab joint structure 100 of this embodiment, the first grout 60a located in the first gap X1 and the second grout 60b located in the second gap X2 can be installed simultaneously. At this time, the insertion hole 11a of the joint member 11 is also filled with grout material, and this filled grout material becomes grout 80. In other words, in the column slab joint structure 100 of this embodiment, the installation of grout 80 can be performed simultaneously in addition to the installation of the first grout 60a and the second grout 60b. The filling of the insertion hole 11a of the joint member 11 with grout material may be performed while the first steel bar member 70a and the second steel bar member 70b are inserted into the insertion hole 11a.

[0040] As shown in Figure 1, it is preferable that the steel bar member 70 is provided with projections 71 on its side surface. This increases the anchoring strength of the steel bar member 70 to the grout 80. In other words, it is possible to further suppress the pulling out of the steel bar member 70 from the insertion hole 11a. The joint body portion 12 of the joint member 11 in this embodiment is a flat plate portion without a support plate, and has a thin thickness T1. In such cases, it may not be possible to secure a sufficient adhesion length between the steel bar member 70 and the grout 80. Therefore, it is particularly preferable to increase the anchoring strength of the steel bar member 70 to the grout 80 by providing projections 71. The projections 71 may be formed, for example, by nuts screwed onto threaded reinforcing bars.

[0041] In this embodiment, a portion of the first steel bar member 70a that protrudes upward from the insertion hole 11a is connected to the steel plate portion 22 of the upper floor column 20. Also, a portion of the second steel bar member 70b that protrudes downward from the insertion hole 11a is connected to the steel plate portion 32 of the lower floor column 30.

[0042] In the column-slab joint structure 100 of this embodiment, the steel bar member 70 includes the first steel bar member 70a and the second steel bar member 70b described above, but the configuration is not limited to this. The column-slab joint structure 100 may include, for example, a joint member 11, an upper floor column 20 and a lower floor column 30, and a single steel bar member 70 connecting them. Furthermore, in this embodiment, the joint member 11 partitions only one insertion hole 11a into which the steel bar member 70 can be inserted, but the configuration is not limited to this. The joint member 11 may have, for example, multiple insertion holes 11a into which the steel bar member 70 can be inserted.

[0043] The column-slab joint structure according to the present invention is not limited to the specific configuration shown in the embodiments described above, and various modifications, changes, and combinations are possible as long as they do not depart from the scope of the claims. [Explanation of Symbols]

[0044] 10: Reinforced concrete slab 11: Joint members 11a: Insertion hole 12: Joint body 12a: Cotter 13a: First protrusion (an example of a protrusion) 13b: Second convex section (an example of a convex section) 14: Slab body 20: Upper floor pillars 20a: Lower end surface of upper floor column 20a1: First recess (an example of a recess) 20a2:Edge 21: Steel pipe section 21a: Outlet 22: Steel plate part 30:Lower pillar 30a: Upper end surface of the lower floor column 30a1: Second recess (an example of a recess) 30a2:Edge 31: Steel pipe section 31a: Inlet 32: Steel plate part 40: Recess 50: Convex part 60: Grout 60a: First grout 60b: Second Grout 70: Steel bar member 70a: First steel bar member 70b: Second steel bar member 71:Protrusion 80: Grout 100: Column-Slab Joint Structure T1: Thickness of the main body of the joint T2: Thickness of the slab itself X: Gap between the concave and convex parts X1: First gap X2: Second gap

Claims

1. Reinforced concrete slab and It comprises upper and lower floor columns separated by the aforementioned reinforced concrete slab, The reinforced concrete slab is equipped with joint members made of precast reinforced concrete that are connected to the upper floor columns and the lower floor columns. At least one of the upper floor columns and the lower floor columns is provided with a recess on its end face. The aforementioned joint member is a column-slab joint structure having a protrusion that fits into the aforementioned recess.

2. The aforementioned joint member comprises a joint body portion on which the protrusion is provided, The column slab joint structure according to claim 1, wherein at least one of the columns is joined to the joint member such that the protrusion fits into the recess and the edge of the recess abuts against the joint body.

3. The column slab joint structure according to claim 2, wherein the joint body is a flat plate portion.

4. A column slab joint structure according to any one of claims 1 to 3, comprising grout interposed between the recess and the protrusion.

5. A column slab joint structure according to any one of claims 1 to 3, comprising a steel bar member extending in the vertical direction and connected to at least one of the columns and the joint member.

6. The joint member has an insertion hole formed in the outer surface of the protrusion into which the steel bar member is inserted. The column slab joint structure according to claim 5, further comprising grout interposed between the inner surface of the joint member that demarcates the insertion hole and the side surface of the steel bar member.

7. The column slab joint structure according to claim 6, wherein the steel bar member has a projection on its side surface.

8. The aforementioned upper floor column has a first recess on its lower end surface that opens downward, The lower floor column described above has a second recess on its upper end surface that opens upward, The aforementioned joint member is, A first protrusion that protrudes upward and fits into the first recess, A column slab joint structure according to any one of claims 1 to 3, comprising: a second protrusion that protrudes downward and is fitted into the second recess.

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