JP7456894B2 - beam joint structure - Google Patents

Description

The present invention relates to a beam joint structure.

A joint structure between a steel pipe pile and a reinforced concrete foundation beam is known (see, for example, Patent Documents 1 and 2).

Japanese Patent Application Publication No. 2013-256849 JP2013-256848A

For example, four concrete beams made of reinforced concrete are connected to the column along the X direction and the Y direction, which are perpendicular to each other in plan view. In this case, the levels of the main beam reinforcements of the four concrete beams are adjusted so that they do not interfere with each other.

By the way, for example, there is a desire to join another concrete beam to a column, which is neither perpendicular nor parallel to one concrete beam in plan view.

However, in this case, level adjustment of the main beam reinforcement of multiple concrete beams may become complicated.

In consideration of the above facts, the present invention facilitates the level adjustment of the beam main reinforcements of the plurality of concrete beams when connecting the plurality of concrete beams that are not orthogonal to each other and are not parallel to each other to a column. The purpose is to make it unnecessary.

The beam joint structure according to claim 1 includes a columnar member, a concrete capital extending from the columnar member, and a plurality of capital main reinforcing bars arranged in a grid shape in a plan view and buried in the upper part of the concrete capital. A plurality of concrete beams are arranged around the columnar member so as not to be perpendicular to each other and not parallel to each other in a plan view, and are joined to the side peripheral surface of the concrete capital, and a plurality of concrete beams are embedded in the concrete beam, and , a beam main reinforcement extending into the concrete capital so as not to reach the columnar member and disposed below the capital main reinforcement.

According to the beam joint structure according to the first aspect, the concrete capital protrudes from the columnar member. A plurality of capital main reinforcing bars arranged in a grid pattern when viewed from above are buried in the upper part of this concrete capital.

In addition, multiple concrete beams are arranged around the columnar member so that they are not perpendicular to each other and are not parallel to each other in a plan view. These concrete beams are joined to the side peripheral surface of the concrete capital. Main beam reinforcement is embedded in each concrete beam.

The main beam reinforcement of each concrete beam extends into the concrete capital so as not to reach the columnar member, and is arranged below the capital main reinforcement. Thereby, the plurality of concrete beams are joined to the columnar member via the concrete capital.

Here, when stress occurs, the stress (tensile force) acting on the main beam reinforcement of one concrete beam is transmitted to the columnar member via the capital main reinforcement, and is transmitted to the beam main reinforcement of other concrete beams via the capital main reinforcement. communicated. Thereby, in the present invention, for example, the beam main reinforcements of a plurality of concrete beams can be made to be at the same level. Therefore, it is possible to easily adjust the level of the beam main reinforcements of a plurality of concrete beams, or to eliminate the need for level adjustment.

A beam joining structure according to a second aspect of the present invention is the beam joining structure according to the first aspect, wherein the thickness of the concrete capital is thicker than the beam thickness of the concrete beam.

According to the beam joint structure according to the second aspect, the thickness of the concrete capital is thicker than the beam thickness of the concrete beam. Thereby, the beam main reinforcement can be easily placed under the capital main reinforcement of the concrete capital.

A beam joint structure according to a third aspect of the present invention is the beam joint structure according to a second aspect, in which the concrete capital projects upwardly from the upper surface of the concrete beam.

According to the beam joint structure according to claim 3, the concrete capital projects upward from the upper surface of the concrete beam.

Here, if the concrete capital is made to protrude below the lower surface of the concrete beam, the design may deteriorate unless the concrete capital is covered from below with a ceiling material or the like.

In contrast, in the present invention, as described above, by making the concrete capital protrude above the upper surface of the concrete beam, the amount of protrusion of the concrete capital that protrudes downward from the lower surface of the concrete beam is reduced, or the concrete capital The lower surface of the concrete beam can be made flush with the lower surface of the concrete beam. Therefore, the design of the concrete capital can be enhanced without covering the concrete capital from below with a ceiling material or the like.

Furthermore, the upper part (protruding part) of the concrete capital that protrudes upward from the upper surface of the concrete beam can be easily covered from above with flooring material, such as an OA floor. Therefore, the design quality of the concrete capital can be ensured.

The beam joining structure according to claim 4 is the beam joining structure according to any one of claims 1 to 3, in which five or more concrete beams are joined to the concrete capital, and at least two The concrete beams of the book are arranged so as not to be orthogonal to each other and not parallel to each other in plan view.

According to the beam joining structure according to claim 4, five or more concrete beams are joined to the concrete capital. At least two concrete beams are arranged so as not to be orthogonal to each other and not parallel to each other in plan view.

The present invention is particularly effective when five or more concrete beams are joined to a columnar member in this way, and by joining the beam main reinforcements of a plurality of concrete beams to a columnar member via capital main reinforcements, for example, The main beam reinforcement of multiple concrete beams can be placed at the same level. Therefore, it is possible to easily adjust the level of the beam main reinforcements of a plurality of concrete beams, or to eliminate the need for level adjustment.

As explained above, according to the present invention, when a plurality of concrete beams that are not orthogonal to each other and are not parallel to each other are connected to a column, it is possible to easily adjust the level of the main beam reinforcement of the plurality of concrete beams, or to adjust the level of the beam main reinforcement of the plurality of concrete beams. can be made unnecessary.

FIG. 4 is a sectional view taken along the line 1-1 in FIG. 3 showing a concrete column, a concrete capital, and a plurality of concrete beams to which a beam joint structure according to an embodiment is applied. FIG. 4 is a sectional view taken along the line 2-2 in FIG. 3 showing a concrete column, a concrete capital, and a plurality of concrete beams to which a beam joint structure according to an embodiment is applied. FIG. 2 is an elevational sectional view showing the concrete capital shown in FIG. 1. FIG. FIG. 2 is a cross-sectional view corresponding to FIG. 1 showing a transmission region where a bending moment in the direction of arrow X is transmitted from a concrete beam to a concrete capital. FIG. 2 is a cross-sectional view corresponding to FIG. 1 showing a transmission region in which a bending moment in the direction of arrow Y is transmitted from a concrete beam to a concrete capital.

Hereinafter, a beam joint structure according to an embodiment will be described with reference to the drawings.

(Beam joint structure)
1 and 2 show a concrete column 10, a concrete capital 20, and a plurality of (in this embodiment, five) concrete beams 30 to which the beam joint structure according to the present embodiment is applied. Note that the arrow X direction and the arrow Y direction shown in each figure indicate two horizontal directions orthogonal to each other.

(concrete pillar)
The concrete pillar 10 is made of reinforced concrete. Further, the concrete pillar 10 is formed to have a circular cross section. This concrete column 10 has a plurality of column main reinforcements 12 and a plurality of shear reinforcing bars 14 buried therein. Note that the concrete column 10 is an example of a columnar member.

The plurality of column main reinforcements 12 extend in the axial direction of the concrete column 10 and are arranged at intervals in the circumferential direction of the concrete column 10. A plurality of shear reinforcing bars 14 are arranged around these column main bars 12. A plurality of concrete beams 30 are connected to the joint portion of the concrete pillar 10 via concrete capitals 20.

Note that the cross-sectional shape of the concrete column 10 is not limited to a circular shape, but may be a rectangular shape.

(Concrete Capital)
Concrete Capital 20 is said to be constructed of reinforced concrete. Moreover, the concrete capital 20 is formed into a rectangular shape in plan view, as shown by the dotted line. At the center of this concrete capital 20, the above-mentioned concrete pillar 10 is provided. Therefore, the concrete capital 20 protrudes from the joint part of the concrete pillar 10 in four directions.

In addition, in FIG. 1 and FIG. 2, the outer shape of the concrete capital 20 is shown by a dotted line. Further, the concrete capital 20 is made of, for example, ordinary concrete and is not reinforced with fibers.

As shown in FIG. 3, a plurality of upper end capital main reinforcements 22, a plurality of lower end capital main reinforcements 24, and a plurality of capital shear reinforcing bars 26 are embedded in the concrete capital 20. Note that the upper end capital main reinforcement 22 is an example of a capital main reinforcement.

The plurality of upper capital main reinforcing bars 22 are helical bars bent in a C-shape (U-shape) when the concrete capital 20 is viewed from the side. These upper end capital main reinforcing bars 22 are buried in the upper part of the concrete capital 20 with the C-shaped opening facing downward. Further, the plurality of upper end capital main reinforcements 22 are arranged in a lattice shape in a plan view, and constitute cage reinforcements.

Note that the upper end capital main reinforcing bars 22 are arranged in a lattice shape along the arrow X direction and the arrow Y direction in plan view.

The upper end capital main reinforcement 22 has a horizontal reinforcement 22A buried on the upper surface 20U side of the concrete capital 20 and a pair of vertical reinforcement 22B buried on the side peripheral surface 20S side of the concrete capital 20.

The horizontal reinforcements 22A are arranged along the upper surface 20U of the concrete capital 20, and as described above, are arranged in a lattice shape when viewed from above. Further, the horizontal reinforcement 22A arranged in the center of the concrete capital 20 is arranged between the adjacent column main reinforcements 12, and crosses the concrete column 10.

A pair of vertical bars 22B extend downward from both ends of the horizontal bars 22A. Further, the pair of vertical reinforcements 22B are arranged along the side peripheral surfaces 20S on both sides of the concrete capital 20, respectively. These vertical bars 22B suppress cracks and the like on the side peripheral surface 20S of the concrete capital 20 (concrete capital 20).

The plurality of lower end capital main reinforcing bars 24 are formed by straight reinforcing bars. These lower end capital main reinforcing bars 24 are buried in the lower part of the concrete capital 20 in a grid pattern when viewed from above.

The lower end capital main reinforcing bars 24 are arranged in a grid pattern along the arrow X direction and the arrow Y direction in plan view. Further, the number of lower end capital main reinforcing bars 24 is smaller than the number of upper end capital main reinforcing bars 22.

(concrete beam)
The plurality of concrete beams 30 are made of reinforced concrete. Further, the plurality of concrete beams 30 are formed to have a rectangular cross section. These concrete beams 30 are arranged around the concrete pillar 10 and are joined to the side peripheral surface 20S (see FIG. 3) of the concrete capital 20.

The plurality of concrete beams 30 are centered on the concrete column 10 in plan view and extend radially from the concrete capital 20. More specifically, the plurality of concrete beams 30 are arranged such that their respective material axes are neither perpendicular nor parallel to each other in plan view.

As shown in FIG. 1, an additional pour section 40 is provided between adjacent concrete beams 30. The additional pour sections 40 are formed by pouring additional concrete capital 20. Each additional pour section 40 has a curved surface 40A that is convex toward the concrete column 10 in plan view. The curved surface 40A connects the side surfaces 30S of adjacent concrete beams 30 in an arc shape. These additional pour sections 40 enhance the design of the concrete capital 20. Note that multiple additional pour sections 40 can be omitted.

As shown in FIG. 3, the beam depth H of each concrete beam 30 is lower than the thickness T of the concrete capital 20. In other words, the thickness T of the concrete capital 20 is thicker than the beam depth H of each concrete beam 30 (T>H).

Further, the lower surface 30L of each concrete beam 30 and the lower surface 20L of the concrete capital 20 are flush with each other. This enhances the design quality when looking up the concrete capital 20 from below.

The upper part of the concrete capital 20 projects upward from the upper surface 30U of each concrete beam 30. A step is formed between the upper surface 20U of the concrete capital 20 and the upper surface 30U of each concrete beam 30.

Each concrete beam 30 has multiple upper end beam main bars 32, multiple lower end beam main bars 34, and multiple shear reinforcement bars 36 embedded in it. The multiple upper end beam main bars 32 and multiple lower end beam main bars 34 are arranged along the material axis direction of the concrete beam 30. The upper end beam main bars 32 are an example of beam main bars.

The plurality of upper end beam main reinforcements 32 are arranged on the upper end side of the concrete beam 30 at intervals in the beam width direction. Moreover, the plurality of upper end beam main reinforcements 32 are arranged in two stages, upper and lower. On the other hand, the plurality of lower end beam main reinforcements 34 are arranged on the lower end side of the concrete beam 30 at intervals in the beam width direction.

The upper end beam main reinforcements 32 of each concrete beam 30 are arranged at the same level (same height). Similarly, the lower end beam main reinforcements 34 of each concrete beam 30 are arranged at the same level (same height). Note that the same level as used herein is not limited to strictly the same level, but is a concept that also includes slight deviations due to construction errors and the like.

The multiple shear reinforcement bars 36 are arranged at intervals in the material axis direction of the concrete beam 30. The multiple shear reinforcement bars 36 are also arranged on the outer periphery of the concrete beam 30, surrounding the multiple upper end beam main reinforcements 32 and the lower end beam main reinforcements 34.

As shown in FIG. 1, the plurality of upper end beam main reinforcements 32 extend from the concrete beam 30 to the upper part of the concrete capital 20 so as not to reach the concrete column 10. Further, as shown in FIG. 2, the plurality of lower end beam main reinforcements 34 extend from the concrete beam 30 to the lower part of the concrete capital 20 so as not to reach the concrete column 10.

As shown in FIG. 3, the plurality of upper-end beam main reinforcements 32 and lower-end beam main reinforcements 34 are arranged between the upper-end capital main reinforcements 22 and the lower-end capital main reinforcements 24 in a side view of the concrete capital 20. That is, in a side view of the concrete capital 20, the plurality of upper end beam main reinforcing bars 32 are arranged below the upper end capital main reinforcing bars 22, and the plurality of lower end beam main reinforcing bars 34 are arranged above the lower end capital main reinforcing bars 24. Note that a plurality of shear reinforcing bars 36 are also buried in the concrete capital 20.

As shown in FIG. 2, the fixing lengths of the plurality of lower end beam main reinforcements 34 to the concrete capital 20 are the same. On the other hand, as shown in FIG. 1, the fixation length of the plurality of upper end beam main reinforcements 32 to the concrete capital 20 is longer for the upper end beam main reinforcements 32 on the center side in the beam width direction than for the upper end beam main reinforcements 32 at both ends in the beam width direction. is getting longer. Thereby, the stress transmission efficiency between the plurality of upper end beam main reinforcements 32 and the concrete capital 20 is enhanced.

Note that the fixing lengths of the plurality of upper end beam main reinforcements 32 to the concrete capital 20 may be the same, similarly to the lower end beam main reinforcements 34.

Furthermore, mechanical fixing devices 50 such as fixing hardware are provided at the ends of the upper end beam main reinforcing bars 32 and the lower end beam main reinforcing bars 34 . These mechanical fixings 50 increase the fixing strength of the upper end beam main reinforcing bars 32 and the lower end beam main reinforcing bars 34 to the concrete capital 20.

The shape and size of the concrete capital 20 are such that the upper end beam main reinforcements 32 and the lower end beam main reinforcements 34 of the adjacent concrete beams 30 do not interfere with each other, and the upper end beam main reinforcements 32 and the lower end beam main reinforcements 32 with respect to the concrete capital 20 do not interfere with each other. It is set appropriately so that the required fixation length of 34 can be secured. Furthermore, the mechanical fixing device 50 (see FIG. 3) may be provided as necessary and can be omitted as appropriate.

(Reinforcement amount of upper capital main reinforcement)
Next, the amount of reinforcement of the upper end capital main reinforcing bars 22 and the lower end capital main reinforcing bars 24 arranged in the concrete capital 20 will be explained.

A plurality of concrete beams 30 are joined to a concrete column 10 via concrete capitals 20. Here, in this embodiment, the connection type between the plurality of concrete beams 30 and the concrete capitals 20 is treated as a pin connection in terms of calculation (structural calculation). In this case, the bending moment is transmitted between the concrete capital 20 and the plurality of concrete beams 30 mainly through the upper end capital main reinforcing bars 22 and the upper end capital main reinforcing bars 22 . Therefore, below, the amount of reinforcement of the upper capital main reinforcement 22 will be explained.

In addition, when the connection type between the plurality of concrete beams 30 and the concrete capital 20 is treated as a rigid connection for calculation purposes, the reinforcement amount of the lower end capital main reinforcing bars 24 is set, for example, in the same manner as the upper end capital main reinforcing bars 22. .

The amount of reinforcement of the upper end capital main reinforcing bars 22 is appropriately set in consideration of the overlapping region of transmission regions of bending moments transmitted from the plurality of concrete beams 30 to the concrete capital 20.

Specifically, as shown in FIGS. 4 and 5, the transmission area of the bending moment transmitted from the plurality of concrete beams 30 to the concrete capital 20 is divided into two horizontal directions (arrow X direction and arrow Y direction) ) will be considered separately.

In addition, below, for convenience of explanation, the plurality of concrete beams 30 will be referred to as concrete beams 30A, 30B, 30C, 30D, and 30E. Further, in FIGS. 4 and 5, illustration of the upper end capital main reinforcing bars 22 and the lower end capital main reinforcing bars 24 is omitted.

First, the bending moment transmission region in the direction of arrow X will be considered. The bending moment in the direction of the arrow X is transmitted from the concrete beams 30A, 30D to the transmission regions _RA , _RD of the concrete capital 20. The transmission regions R _A and R _D extend from the concrete beams 30A and 30D toward the concrete column 10 in plan view. The amount of reinforcement (hereinafter referred to as "required amount of reinforcement in the X direction") of the upper end capital main reinforcement 22 (see FIG. 1) required for the overlapping region _LX of these transmission regions R _A and _RD is calculated.

Next, the bending moment transmission region in the direction of arrow Y will be considered. The bending moment in the direction of arrow Y is transmitted from the concrete beams 30B, 30C, and 30E to the transmission regions _RB , _RC , and _RE of the concrete capital 20. The transmission regions R _B , R _C , and R _E extend from the concrete beams 30B, 30C, and 30E toward the concrete column 10 in plan view. Calculate the necessary amount of reinforcement for the upper end capital main reinforcement 22 (see Figure 1) (hereinafter referred to as "required amount of reinforcement in the Y direction") in the overlapping region _LY of these transmission regions _RB , _RC , and _RE . .

In the direction of the arrow X of the concrete capital 20, the upper end capital main reinforcements 22 are arranged in an amount greater than the required amount of reinforcement in the 22 is reinforced.

Note that the spread of each transmission region R _A , R _B , R _C , R _D , and _RE is determined by, for example, stress analysis.

(effect)
Next, the operation of this embodiment will be explained.

As shown in FIGS. 1 and 2, according to the beam joint structure according to the present embodiment, a concrete capital 20 overhangs from a concrete column 10. A plurality of upper end capital main reinforcing bars 22 are buried in the upper part of the concrete capital 20, which are arranged in a grid pattern when viewed from above.

Further, around the concrete pillar 10, a plurality of concrete beams 30 are arranged so as not to be orthogonal to each other and not parallel to each other in plan view. These concrete beams 30 are joined to the side peripheral surface 20S of the concrete capital 20. A plurality of upper end beam main reinforcements 32 and a plurality of lower end beam main reinforcements 34 are embedded in each concrete beam 30.

The upper end beam main reinforcement 32 and the lower end beam main reinforcement 34 of each concrete beam 30 extend into the concrete capital 20 so as not to reach the concrete column 10, and are arranged between the horizontal reinforcement 22A of the upper end capital main reinforcement 22 and the lower end beam main reinforcement 34. ing.

More specifically, the upper end beam main reinforcement 32 of each concrete beam 30 is arranged below the horizontal reinforcement 22A of the upper end capital main reinforcement 22, and the lower end beam main reinforcement 34 of each concrete beam 30 is arranged above the lower end capital main reinforcement 24. ing. Thereby, the plurality of concrete beams 30 are joined to the concrete column 10 via the concrete capital 20.

Here, when stress is generated, for example, stress (tensile force) acting on the upper end beam main reinforcement 32 of one concrete beam 30 is transmitted to the concrete column 10 via the upper end capital main reinforcement 22, and the upper end capital main reinforcement 22 is transmitted to the concrete column 10 via the upper end capital main reinforcement 22. It is transmitted to the upper end beam main reinforcement 32 of the other concrete beam 30 via the concrete beam. Further, for example, stress acting on the lower end beam main reinforcement 34 of one concrete beam 30 is transmitted to the concrete column 10 via the lower end capital main reinforcement 24, and is transmitted to the lower end of the other concrete beam 30 via the lower end capital main reinforcement 24. It is transmitted to the beam main reinforcement 34.

Thereby, in this embodiment, for example, the upper end beam main reinforcements 32 of the plurality of concrete beams 30 can be made to be at the same level, and the lower end beam main reinforcements 34 can be made to be at the same level. Therefore, the level adjustment of the upper end beam main reinforcing bars 32 and the lower end beam main reinforcing bars 34 of the plurality of concrete beams 30 can be easily adjusted, or level adjustment can be made unnecessary.

Further, for example, when five concrete beams 30 are joined to the joint part of the concrete pillar 10 without using the concrete capital 20, the level adjustment of the upper end beam main reinforcement 32 and the lower end beam main reinforcement 34 of the plurality of concrete beams 30 is necessary. Make it complicated.

This embodiment is particularly effective when five or more concrete beams 30 are connected to the concrete column 10 in this way, and five concrete beams 30 are connected to the joint part of the concrete column 10 via the concrete capital 20. By doing so, the level adjustment of the upper end beam main reinforcement 32 and the lower end beam main reinforcement 34 of the plurality of concrete beams 30 can be facilitated or the level adjustment can be made unnecessary.

Moreover, as shown in FIG. 3, the thickness T of the concrete capital 20 is thicker than the beam thickness H of the plurality of concrete beams 30 (T>H). Thereby, the upper end beam main reinforcing bars 32 of the plurality of concrete beams 30 can be easily arranged under the upper end capital main reinforcing bars 22 of the concrete capital 20.

Furthermore, the upper part of the concrete capital 20 projects upward from the upper surface 30U of the concrete beam 30.

Here, if the lower part of the concrete capital 20 is made to protrude below the lower surface 30L of the concrete beam 30, the design may deteriorate unless the lower part of the concrete capital 20 is covered from below with a ceiling material etc. be.

In contrast, in this embodiment, as described above, the upper part of the concrete capital 20 protrudes upward from the upper surface 30U of the concrete beam 30, thereby reducing the amount of protrusion of the concrete capital 20 downward from the lower surface 30L of the concrete beam 30, or making the lower surface 20L of the concrete capital 20 flush with the lower surface 30L of the concrete beam 30. Therefore, the design of the concrete capital 20 can be improved without covering the concrete capital 20 from below with a ceiling material or the like.

Further, the upper part of the concrete capital 20 that protrudes upward from the upper surface 30U of the concrete beam 30 can be easily covered from above with a flooring material such as an OA floor, for example. Therefore, the design quality of the concrete capital 20 can be ensured.

(Modified example)
Next, a modification of the above embodiment will be described.

In the embodiment described above, the upper end capital main reinforcing bars 22 and the lower end capital main reinforcing bars 24 are embedded in the concrete capital 20. However, at least the upper end capital main reinforcing bars 22 can be buried in the concrete capital 20. In this case, it is sufficient that at least the upper end beam main reinforcement 32 is disposed below the upper end capital main reinforcement 22.

Further, in the above embodiment, the upper end capital main reinforcing bars 22 of the concrete capital 20 include a horizontal reinforcement 22A and a pair of vertical reinforcements 22B. However, the pair of vertical stripes 22B can be omitted as appropriate. That is, the upper end capital main reinforcing bars may be a plurality of linear reinforcing bars arranged in a lattice shape when viewed from above.

Further, in the embodiment described above, the lower end capital main reinforcing bars 24 of the concrete capital 20 are linear reinforcing bars. However, the lower end capital main reinforcing bars may be bent into a C-shape (U-shape) with an open top when viewed from the side of the concrete capital 20.

Further, in the above embodiment, the lower surface 20L of the concrete capital 20 and the lower surface 30L of the plurality of concrete beams 30 are flush with each other. However, a step may be formed between the lower surface 20L of the concrete capital 20 and the lower surface 30L of the plurality of concrete beams 30.

Further, in the embodiment described above, the upper part of the concrete capital 20 projects upward from the upper surface 30U of the plurality of concrete beams 30. However, the lower part of the concrete capital 20 may be made to protrude below the lower surface 30L of the plurality of concrete beams 30.

Further, in the embodiment described above, the thickness T of the concrete capital 20 is made thicker than the beam thickness H of the plurality of concrete beams 30. However, the thickness T of the concrete capital 20 may be the same as the beam thickness H of the plurality of concrete beams 30. That is, the thickness T of the concrete capital 20 can be set to be greater than or equal to the beam thickness H of the plurality of concrete beams 30.

Further, in the above embodiment, the five concrete beams 30 are arranged so as not to be orthogonal to each other and not parallel to each other in plan view. However, it is sufficient that at least two concrete beams 30 among the five concrete beams 30 are arranged so as not to be orthogonal to each other and not parallel to each other in plan view.

In addition, in the above embodiment, five concrete beams 30 are joined to the concrete column 10. However, at least two concrete beams 30 can be joined to the concrete column 10. The shape of the concrete capital 20 can be changed as appropriate depending on the number of concrete beams 30 to be joined to the concrete column 10.

Further, in the above embodiment, the concrete pillar 10 is cast in place. However, the concrete column 10 may be formed of precast concrete (precast concrete column).

Further, the columnar member is not limited to the concrete column 10, but may be a column such as a steel column or a CFT column. Furthermore, the columnar member is not limited to a column, and may be a pile such as a concrete pile or a steel pile.

In addition, the concrete capital in the above embodiment means a concrete member that overhangs from a columnar member and to which a concrete beam is connected, such as a column base of a column as a columnar member or a pile head of a pile as a columnar member. This concept also includes footings that overhang from the ground.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and the embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention may be It goes without saying that the invention can be implemented in various ways without departing from the scope.

10 Concrete column (column member)
20 Concrete capital 22 Upper capital main reinforcement (capital main reinforcement)
30 Concrete beam 30A Concrete beam 30B Concrete beam 30C Concrete beam 30D Concrete beam 30E Concrete beam 32 Top end beam main reinforcement (beam main reinforcement)
T Thickness of concrete capital H Beam thickness of concrete beam

Claims (4)

a columnar member;
a concrete capital extending from the columnar member;
a plurality of capital main reinforcing bars arranged in a lattice shape in plan view and buried in the upper part of the concrete capital;
A plurality of concrete beams arranged around the columnar member so as not to be orthogonal to each other and not parallel to each other in a plan view, and to be joined to the side peripheral surface of the concrete capital;
A beam main reinforcement that is embedded in the concrete beam, extends into the concrete capital so as not to reach the columnar member, and is arranged below the capital main reinforcement;
Beam joint structure with. The thickness of the concrete capital is thicker than the beam thickness of the concrete beam,
The beam joint structure according to claim 1. The concrete capital projects upward from the top surface of the concrete beam.
The beam joint structure according to claim 2. Five or more of the concrete beams are connected to the concrete capital,
At least two of the concrete beams are arranged so as not to be orthogonal to each other and not parallel to each other in plan view;
The beam joint structure according to any one of claims 1 to 3.