Joint structure of column and flat beam

Abstract

To provide a joint structure of a column and a flat beam, capable of suppressing torsional deformation that may occur in an overhanging portion projecting from the column of the flat beam.SOLUTION: There is provided a joint structure 70 of a column and a flat beam in which a reinforced concrete column 10 and a reinforced concrete flat beam 20 wider than a width of the column 10 are joined. The flat beam 20 includes a column width corresponding portion 22E corresponding to the width of the column, and projecting portions 22A and 22B projecting laterally from the column 10. The column width corresponding portion 22E is provided with a first upper end main reinforcement 41 and a first lower end main reinforcement 42. The projecting portions 22A and 22B are provided with a second upper end main reinforcement 43 and a second lower end main reinforcement 44. A first reinforcing bar 51 bridging the first upper end main reinforcement 41 and the second lower end main reinforcement 44, and a second reinforcing bar 55 bridging the first lower end main reinforcement 42 and the second upper end main reinforcement 43 cross each other inside the projecting portions 22A and 22B.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a joint structure between a column and a flat beam.

Background Art

[0002] From the viewpoint of effectively using the indoor space, if one tries to reduce the beam height, the performance of the beam will decrease. Therefore, in order to compensate for this performance decrease, construction may be carried out with the beam width being larger than the column width. A beam with a width larger than the column width in this way is called a flat beam or a wide beam. In apartment houses, etc., by providing a flat beam on the balcony side, an open space can be formed to add value to the building. In areas with height restrictions, by applying flat beams to each floor, the height of the entire building can be reduced and construction of a building with a predetermined number of floors can be made possible. The effects of applying flat beams are extremely high.

[0003] Here, Patent Document 1 has proposed a joint structure between a column and a flat beam. Specifically, regarding the joint structure between a column and a flat beam having a beam width wider than the column width, inside the column height of the column, a plurality of first reinforcing bars, which are divided into two and each has a U-shape, are fixed to the beam main bars inside the column width so as to surround the plurality of beam main bars arranged in the flat beam. Outside the column width of the column in the flat beam, a U-shaped second reinforcing bar composed of a linear base portion and two leg portions is arranged from the outer surface side flush with the inner side of the column width of the flat beam toward the inside of the flat beam, and the two leg portions are fixed to the first reinforcing bars.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the joint structure of the column and the flat beam described in Patent Document 1, the U-shaped reinforcing bars arranged in the overhanging part of the flat beam that protrudes laterally beyond the width of the column are said to enhance the rigidity of the overhanging part of the flat beam.

[0006] By the way, at the joint of the column and the flat beam, when a horizontal force acts on the column during an earthquake, in the flat beam, in the front and rear parts in the direction of action of the horizontal force on the column (front-rear direction), and in the overhanging parts that protrude in the width direction of the column orthogonal to the direction of action of the horizontal force, specific internal forces can be generated respectively. This will be described with reference to FIGS. 1 and 2.

[0007] FIG. 1 is a perspective view for explaining a state in which a horizontal force during an earthquake acts on a column of a conventional joint structure of a column and a flat beam, and FIG. 2 is a view for explaining the internal forces acting on each part by disassembling the column and the flat beam in the joint structure of the column and the flat beam shown in FIG. 1.

[0008] The joint structure 30 of the column and the flat beam shown in FIG. 1 is a joint structure between a reinforced concrete column 10 and a reinforced concrete flat beam 20 wider than the column width. Here, the illustration of the main column bars in the cross-section of the column 10 is omitted.

[0009] When a horizontal force H acts on the column 10 during an earthquake, the flat beam 20 has a front part 21A and a rear part 21B in the X1 direction, which is the direction of action of the horizontal force H (front-rear direction), and overhanging parts 22A and 22B that protrude in the X2 direction, which is the width direction of the column 10 orthogonal to the direction of action of the horizontal force H. Here, when the direction of the horizontal force during an earthquake changes by 90 degrees, the front and rear parts and the overhanging parts in the flat beam 20 also change.

[0010] As shown in Fig. 2, at the interfaces between the column 10, the decomposed flat beam 20 into the front part 21A and the rear part 21B, and the overhanging parts 22A and 22B, a bending moment M1 and a shear force S1 act at the interface between the column 10 and the front part 21A, and a bending moment M2 and a shear force S2 act at the interface between the column 10 and the rear part 21B. And with respect to these bending moments M1 and M2, the upper and lower main reinforcement bars (both not shown) of the flat beam 20 in the X1 direction extending from the front part 21A through the column 10 to the rear part 21B can resist.

[0011] On the other hand, at the interfaces between the column 10 and the overhanging parts 22A and 22B, torsional moments T1 and T2 caused by the bending moments M1 and M2 act, and vertical deformations in the Z direction occur in the overhanging parts 22A and 22B. However, it is difficult to suppress these torsional moments T1 and T2 and the vertical deformations (torsional deformations caused by the torsional moments) in the vertical direction caused by the torsional moments T1 and T2. Further, even if the U-shaped reinforcing bars described in Patent Document 1 are applied, since the reinforcing bars do not extend in the direction of suppressing the vertical deformations caused by the torsional moments T1 and T2, it remains difficult to suppress the torsional deformations.

[0012] The present invention has been made in view of the above problems, and an object thereof is to provide a joint structure between a column and a flat beam that can suppress torsional deformations that may occur in an overhanging part that projects from the column of the flat beam.

Means for Solving the Problems

[0013] To achieve the above object, one aspect of the joint structure between a column and a flat beam according to the present invention is a joint structure between a column made of reinforced concrete and a flat beam made of reinforced concrete that is wider than the width of the column, wherein the flat beam includes a column-width equivalent part corresponding to the width of the column and an overhanging part that projects laterally from the column, a first upper main reinforcement bar and a first lower main reinforcement bar are provided in the column-width equivalent part, and a second upper main reinforcement bar and a second lower main reinforcement bar are provided in the overhanging part. A first reinforcing bar spanning between the first upper main bar and the second lower main bar, and a second reinforcing bar spanning between the first lower main bar and the second upper main bar intersect inside the cantilevered portion.

[0014] According to this aspect, the first reinforcing bar spans between the first upper main bar at the portion corresponding to the column width of the flat beam and the second lower main bar at the cantilevered portion of the flat beam, and the second reinforcing bar spans between the first lower main bar at the portion corresponding to the column width and the second upper main bar at the cantilevered portion of the flat beam. The first reinforcing bar and the second reinforcing bar that intersect each other inside the cantilevered portion and extend in an oblique direction can effectively suppress the vertical torsional deformation caused by the torsional moment acting on the cantilevered portion. For example, for the upward torsional deformation, the second reinforcing bar effectively acts to suppress the deformation, and for the downward torsional deformation, the first reinforcing bar effectively acts to suppress the deformation.

[0015] Here, a plurality of first reinforcing bars can be arranged at a predetermined pitch in the extending direction with respect to the first upper main bar and the second lower main bar, and a plurality of second reinforcing bars can be arranged at a predetermined pitch in the extending direction with respect to the first lower main bar and the second upper main bar so as not to interfere with the first reinforcing bars.

[0016] Also, in another aspect of the joint structure of the column and the flat beam according to the present invention, both the first reinforcing bar and the second reinforcing bar are provided with hooks at both ends thereof, the hook of the first reinforcing bar is engaged with the first upper main bar and the second lower main bar, and the hook of the second reinforcing bar is engaged with the first lower main bar and the second upper main bar.

[0017] According to this aspect, since both the first reinforcing bar and the second reinforcing bar are provided with hooks at both ends thereof and each hook is engaged with the corresponding upper main bar and lower main bar, the first reinforcing bar and the second reinforcing bar can be positioned, and the tensile forces of the first reinforcing bar and the second reinforcing bar can be effectively exerted during the torsional deformation of the cantilevered portion.

[0018] In another aspect of the column and flat beam joint structure according to the present invention, while a plurality of the first reinforcing bars are engaged with different second lower main reinforcing bars while being engaged at engagement locations adjacent to each other in the first upper main reinforcing bar, it is characterized in that a plurality of the second reinforcing bars are engaged with different second upper main reinforcing bars while being engaged at engagement locations adjacent to each other in the first lower main reinforcing bar.

[0019] According to this aspect, when the first reinforcing bar and the second reinforcing bar one by one in one longitudinal section cannot sufficiently suppress torsional deformation, a plurality of first reinforcing bars are engaged with different second lower main reinforcing bars while being engaged at engagement locations adjacent to each other in the first upper main reinforcing bar, and a plurality of second reinforcing bars are engaged with different second upper main reinforcing bars while being engaged at engagement locations adjacent to each other in the first lower main reinforcing bar, whereby it becomes possible to suppress torsional deformation.

[0020] For example, in the cantilever part, when six second upper main reinforcing bars and six second lower main reinforcing bars are respectively arranged, it becomes possible to arrange a maximum of six first reinforcing bars and second reinforcing bars in one longitudinal section.

[0021] In another aspect of the column and flat beam joint structure according to the present invention, the cantilever parts are respectively provided on the left and right sides of the column, a first continuous reinforcing bar is provided, in which two of the first reinforcing bars extending obliquely in the left and right cantilever parts and a first connecting bar connecting the two first reinforcing bars and extending in the width direction of the column width equivalent part are continuous, and it is characterized in that a second continuous reinforcing bar is provided, in which two of the second reinforcing bars extending obliquely in the left and right cantilever parts and a second connecting bar connecting the two second reinforcing bars and extending in the width direction of the column width equivalent part are continuous.

[0022] According to this aspect, when overhanging portions are provided on the left and right sides of the column respectively, two first reinforcing bars extending in an oblique direction for the left and right overhanging portions and a first connecting bar connecting these and extending in the width direction of the portion corresponding to the column width are applied as a first continuous reinforcing bar, and two second reinforcing bars extending in an oblique direction for the left and right overhanging portions and a second connecting bar connecting these and extending in the width direction of the portion corresponding to the column width are applied as a second continuous reinforcing bar. By doing so, it becomes possible to arrange the first continuous reinforcing bar and the second continuous reinforcing bar with excellent workability and effectively suppress the torsional deformation in the left and right overhanging portions. For example, when the first continuous reinforcing bar and the second continuous reinforcing bar are not applied, the first reinforcing bar and the second reinforcing bar described above are arranged for the left and right overhanging portions, but the workability is significantly improved when compared with this construction.

[0023] Also, in another aspect of the joint structure of the column and the flat beam according to the present invention, both the first continuous reinforcing bar and the second continuous reinforcing bar are provided with hooks at both ends, the two hooks of the first continuous reinforcing bar are engaged with the second lower main bars of the left and right overhanging portions, and the two hooks of the second continuous reinforcing bar are engaged with the second upper main bars of the left and right overhanging portions.

[0024] According to this aspect, since both the first continuous reinforcing bar and the second continuous reinforcing bar are provided with hooks at their both ends and each hook is engaged with the corresponding upper main bar and lower main bar, the first continuous reinforcing bar and the second continuous reinforcing bar can be positioned, and it becomes possible to effectively exert the tensile force of the first continuous reinforcing bar and the second continuous reinforcing bar during the torsional deformation of the overhanging portion.

[0025] Also, in another aspect of the joint structure of the column and the flat beam according to the present invention, a plurality of the first continuous reinforcing bars are engaged at adjacent engagement positions on the first upper main bar while being respectively engaged with different second lower main bars in the left and right overhanging portions, A plurality of the second continuous reinforcing bars are respectively engaged with different second upper main reinforcing bars at the overhanging portions on the left and right while being engaged at the engaging portions adjacent to each other on the first lower main reinforcing bar.

[0026] According to this aspect, when the first continuous reinforcing bars and the second continuous reinforcing bars, one by one in one longitudinal section, cannot sufficiently suppress the torsional deformation, a plurality of the first continuous reinforcing bars are engaged at the engaging portions adjacent to each other on the first upper main reinforcing bar while being respectively engaged with different second lower main reinforcing bars at the overhanging portions on the left and right, and a plurality of the second continuous reinforcing bars are engaged at the engaging portions adjacent to each other on the first lower main reinforcing bar while being respectively engaged with different second upper main reinforcing bars at the overhanging portions on the left and right, whereby it becomes possible to suppress the torsional deformation.

Effect of the Invention

[0027] As can be understood from the above description, according to the column and flat beam joint structure of the present invention, it is possible to suppress the torsional deformation that may occur in the overhanging portion protruding from the column of the flat beam.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

[0029] Hereinafter, an example of a joint structure between a column and a flat beam according to an embodiment will be described with reference to the accompanying drawings. In the present specification and the drawings, substantially the same components may be denoted by the same reference numerals to omit redundant descriptions.

[0030] [Joint Structure between Column and Flat Beam According to Embodiment] With reference to FIGS. 3 to 7, an example of a joint structure between a column and a flat beam according to an embodiment will be described. Here, FIG. 3 is a perspective view for explaining a state in which a horizontal force acts on the column of the joint structure between the column and the flat beam according to the embodiment during an earthquake. Further, FIG. 4 is a view taken along the arrow IV-IV of FIG. 3, showing an example of reinforcing bars in a longitudinal section passing through a portion corresponding to the column width of the flat beam and the overhanging portions, and FIGS. 5 to 7 are figures corresponding to FIG. 4, showing other examples of the reinforcing bars.

[0031] The joint structure 70 between the column and the flat beam shown in FIG. 3 is a joint structure between a reinforced concrete column 10 and a reinforced concrete flat beam 20 having a width wider than the column width. Here, illustration of the main column bars in the cross-sectional view of the column 10 is omitted.

[0032] When a horizontal force H acts on the column 10 during an earthquake, the flat beam 20 has a front portion 21A and a rear portion 21B in the X1 direction, which is the acting direction (front-rear direction) of the horizontal force H, and overhanging portions 22A and 22B that project in the X2 direction, which is the width direction of the column 10 orthogonal to the acting direction of the horizontal force H.

[0033] Here, when the horizontal force during an earthquake changes by 90 degrees and acts in the X2 direction, the front and rear parts and the cantilever parts of the flat beam 20 also change, and torsional deformation occurs in the cantilever parts 22C and 22D that project in the X1 direction. Therefore, the cantilever parts 22A, 22B, 22C, and 22D become the parts to be reinforced against torsional deformation. Hereinafter, a plurality of examples of reinforcing bars will be described with reference to FIGS. 4 to 7, which are longitudinal sectional views passing through the cantilever parts 22A and 22B. The same reinforcing bars are also arranged in the cantilever parts 22C and 22D. Further, in FIGS. 4 to 7, for ease of understanding, the reinforcing bars are shown by solid lines and one-dot chain lines.

[0034] In the reinforcement arrangement example shown in FIG. 4, the first upper main reinforcement 41 at the left and right ends in the column width equivalent part 22E and the second lower main reinforcement 44 at both ends of the cantilever parts 22A and 22B straddle the first reinforcing bar 51, and the first lower main reinforcement 42 at the left and right ends in the column width equivalent part 22E and the second upper main reinforcement 43 at both ends of the cantilever parts 22A and 22B straddle the second reinforcing bar 55, and the first reinforcing bar 51 and the second reinforcing bar 55 intersect with each other inside the cantilever parts 22A and 22B.

[0035] Here, both the first reinforcing bar 51 and the second reinforcing bar 55 are provided with hooks 52 and 56 at both ends thereof. And the hooks 52 at both ends of the first reinforcing bar 51 are engaged with both the first upper main reinforcement 41 and the second lower main reinforcement 44, and the hooks 56 at both ends of the second reinforcing bar 55 are engaged with both the first lower main reinforcement 42 and the second upper main reinforcement 43.

[0036] In both the cantilever part 22A and the column width equivalent part 22E and the cantilever part 22B and the column width equivalent part 22E, a plurality of first reinforcing bars 51 are arranged at a predetermined pitch in the extending direction (the X1 direction in FIG. 3) with respect to the first upper main reinforcement 41 and the second lower main reinforcement 44, and a plurality of second reinforcing bars 55 are arranged at a predetermined pitch in the extending direction with respect to the first lower main reinforcement 42 and the second upper main reinforcement 43 so as not to interfere with the first reinforcing bars 51.

[0037] As shown in Fig. 2, when torsional moments T1 and T2 act on the cantilever portions 22A and 22B, causing torsional deformation in the Z direction (vertical direction) due to the torsional moments T1 and T2, the first reinforcing bars 51 and the second reinforcing bars 55 that intersect each other and extend in the upper and lower diagonal directions can effectively suppress this torsional deformation.

[0038] Specifically, as shown in Fig. 4, for torsional deformation in the upward Z1 direction, the second reinforcing bar 55 effectively acts to suppress the deformation, and for torsional deformation in the downward Z2 direction, the first reinforcing bar 51 effectively acts to suppress the deformation.

[0039] Since the amount of torsional deformation is the largest at the end sides of the cantilever portions 22A and 22B (the sides away from the column 10), the first reinforcing bar 51 is engaged with the second lower main bars 44 at both ends of the cantilever portions 22A and 22B, and similarly, the second reinforcing bar 55 is engaged with the second upper main bars 43 at the ends, thereby effectively suppressing the torsional deformation of the cantilever portions 22A and 22B.

[0040] In addition, both the first reinforcing bar 51 and the second reinforcing bar 55 are provided with hooks 52 and 56 at both of their ends, and each hook 52 and 56 is engaged with the corresponding upper main bars 41 and 43 and lower main bars 42 and 44, so that the first reinforcing bar 51 and the second reinforcing bar 55 can be positioned, and the tensile forces of the first reinforcing bar 51 and the second reinforcing bar 55 can be effectively exerted during the torsional deformation of the cantilever portions 22A and 22B.

[0041] On the other hand, the reinforcement arrangement example shown in Fig. 5 is different from the example shown in Fig. 4 in that three first reinforcing bars 51 and three second reinforcing bars 55 are arranged in one longitudinal section. Here, strictly speaking, three first reinforcing bars 51 and three second reinforcing bars 55 are arranged in the extending directions of the first upper main bar 41 and the first lower main bar 42 respectively, but these are shown together in one longitudinal section.

[0042] The hooks 52 at one ends of the three first reinforcing bars 51 with different lengths are engaged at the engaging portions adjacent to each other in the first upper main bar 41, and the hooks 52 at the other ends are respectively engaged with different second lower main bars 44.

[0043] Also, the hooks 56 at one ends of the three second reinforcing bars 55 with different lengths are engaged at the engaging portions adjacent to each other in the first lower main bar 42, and the hooks 56 at the other ends are respectively engaged with different second upper main bars 43.

[0044] According to the reinforcement arrangement form in the illustrated example, when the first reinforcing bar 51 and the second reinforcing bar 55 one by one cannot sufficiently suppress the torsional deformation in one longitudinal section, it becomes possible to suppress this torsional deformation.

[0045] On the other hand, the reinforcement example shown in FIG. 6 applies a first continuous reinforcing bar 61 in which two first reinforcing bars 62 extending obliquely in the left and right cantilever portions 22A and 22B and a first connecting bar 63 connecting them and extending in the width direction of the column width corresponding portion 22E are continuous, and two second reinforcing bars 66 extending obliquely in the left and right cantilever portions 22A and 22B and a second connecting bar 67 connecting them and extending in the width direction of the column width corresponding portion 22E are continuous. The second continuous reinforcing bar 65 is applied, which is different from the examples shown in FIGS. 4 and 5.

[0046] In the reinforcement example of FIG. 4, it is necessary to arrange a total of four first reinforcing bars 51 and second reinforcing bars 55 on both the left and right cantilever portions 22A and 22B. In contrast, in the reinforcement example shown in FIG. 6, only one first continuous reinforcing bar 61 and one second continuous reinforcing bar 65 are arranged, and a torsional deformation suppressing effect substantially equivalent to that of the reinforcement example of FIG. 4 can be expected. Therefore, under excellent workability, it becomes possible to arrange the first continuous reinforcing bar 61 and the second continuous reinforcing bar 65 to effectively suppress the torsional deformation in the left and right cantilever portions 22A and 22B.

[0047] On the other hand, the reinforcement arrangement example shown in FIG. 7 is different from the example shown in FIG. 6 in that three first continuous reinforcement bars 61 and three second continuous reinforcement bars 65 are arranged in one vertical section.

[0048] Each of the three first continuous reinforcement bars 61 has first reinforcement bars 62 with different lengths on the left and right, and the hooks 64 at one end of each are respectively engaged with different second lower main reinforcement bars 44 at the left and right cantilever portions 22A, 22B.

[0049] Also, each of the three second continuous reinforcement bars 65 has second reinforcement bars 66 with different lengths on the left and right, and the hooks 68 at one end of each are respectively engaged with different second upper main reinforcement bars 43 at the left and right cantilever portions 22A, 22B.

[0050] According to the reinforcement form of the illustrated example, when the first continuous reinforcement bar 61 and the second continuous reinforcement bar 65 one by one in one vertical section cannot sufficiently suppress the torsional deformation, it becomes possible to suppress this torsional deformation.

[0051] Other embodiments in which other components are combined with the configurations and the like described in the above embodiments may be possible, and the present invention is not limited to the configurations shown here at all. In this regard, it can be changed without departing from the gist of the present invention, and can be appropriately determined according to the application form.

Explanation of Signs

[0052] 10: Column 20: Flat beam 21A: Front part 21B: Rear part 22A, 22B, 22C, 22D: Cantilever portion 22E: Column width equivalent part 41: First upper main reinforcement bar (upper main reinforcement bar) 42: First lower main reinforcement bar (lower main reinforcement bar) 43: Second upper main reinforcement bar (upper main reinforcement bar) 44: Second lower main reinforcement bar (lower main reinforcement bar) 51: First reinforcement bar 52: Hook 55: Second reinforcing bar 56: Hook 61: First continuous reinforcing bar 62: First reinforcing bar 63: First connecting bar 64: Hook 65: Second continuous reinforcing bar 66: Second reinforcing bar 67: Second connecting bar 68: Hook 70: Joint structure between column and flat beam (joint structure) H: Horizontal force M1, M2: Bending moment S1, S2: Shearing force T1, T2: Torsional moment

Claims

1. A joint structure of a column and a flat beam, wherein a column made of reinforced concrete and a flat beam made of reinforced concrete having a width wider than the width of the column are joined, The flat beam includes a column-width equivalent portion corresponding to the width of the column and an overhanging portion that projects laterally beyond the column, In the column-width equivalent portion, a first upper main reinforcement and a first lower main reinforcement are provided, In the overhanging portion, a second upper main reinforcement and a second lower main reinforcement are provided, A column and flat beam joint structure, characterized in that a first reinforcing bar spanning the first upper main reinforcement and the second lower main reinforcement and a second reinforcing bar spanning the first lower main reinforcement and the second upper main reinforcement intersect inside the overhanging portion.

2. Both the first reinforcing bar and the second reinforcing bar are provided with hooks at both ends thereof, The hook of the first reinforcing bar is engaged with the first upper main reinforcement and the second lower main reinforcement, The column and flat beam joint structure according to claim 1, characterized in that the hook of the second reinforcing bar is engaged with the first lower main reinforcement and the second upper main reinforcement.

3. A plurality of the first reinforcing bars are respectively engaged with different second lower main reinforcements while being engaged at adjacent engagement locations on the first upper main reinforcement, The column and flat beam joint structure according to claim 1 or 2, characterized in that a plurality of the second reinforcing bars are respectively engaged with different second upper main reinforcements while being engaged at adjacent engagement locations on the first lower main reinforcement.

4. The overhanging portions are respectively provided on the left and right sides of the column, A first continuous reinforcing bar is provided, in which two first reinforcing bars extending obliquely in the overhanging portions on the left and right and a first connecting bar connecting the two first reinforcing bars and extending in the width direction of the column-width equivalent portion are continuous, The column and flat beam joint structure according to claim 1, characterized in that a second continuous reinforcing bar is provided, in which two second reinforcing bars extending obliquely in the overhanging portions on the left and right and a second connecting bar connecting the two second reinforcing bars and extending in the width direction of the column-width equivalent portion are continuous.

5. Both the first continuous reinforcing bar and the second continuous reinforcing bar are provided with hooks at both ends thereof, The two hooks of the first continuous reinforcing bar are engaged with the second lower main reinforcements of the overhanging portions on the left and right, The column and flat beam joint structure according to claim 4, characterized in that the two hooks of the second continuous reinforcing bar are engaged with the second upper main reinforcements of the overhanging portions on the left and right.

6. While the plurality of the first continuous reinforcing bars are engaged at the engagement portions adjacent to each other in the first upper end main bar, they are respectively engaged with the different second lower end main bars in the left and right overhanging portions. The column and flat beam joint structure according to claim 4 or 5, characterized in that the plurality of the second continuous reinforcing bars are respectively engaged with the different second upper end main bars in the left and right overhanging portions while being engaged at the engagement portions adjacent to each other in the first lower end main bar.

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