JP2020165213A - Column-beam joint structure, and construction of the same - Google Patents

Abstract

To provide a joint structure of a concrete column and a steel beam which has good workability, which can secure sufficient earthquake proof strength and which can reduce manufacturing and constructing cost.SOLUTION: In a joint structure of a concrete column 2 and a steel beam 3, the concrete column 2 includes: a column main body portion 11 comprising RC concrete; a connection portion 12 including a steel pipe assembly 20 disposed at an outer peripheral portion and concrete 6 filled inside. The steel pipe assembly 20 includes: a lower diaphragm 21 and an upper diaphragm 22 horizontally extending respectively at a height of a lower flange 8 and an upper flange 9 of the steel beam 3; a connection portion main body portion 23 comprising a steel pipe connected with to an upper face of the lower diaphragm 21 and a lower face of the upper diaphragm 22; and a lower side extension portion 24 comprising a steel pipe downwardly extending from a lower face of the lower diaphragm 21. Height dimension H2 of the lower side extension portion 24 is larger than a beam height H1 of the steel beam.SELECTED DRAWING: Figure 1

Description

The present disclosure describes a joint structure of a concrete column and a steel beam, more specifically, a concrete column and a steel beam including a column body portion made of RC concrete and a joint portion filled with concrete inside a steel pipe assembly. The joint structure of the concrete and the construction method thereof.

A steel structure is suitable for a building having a long-span beam of about 10 to 12 m and bearing a large load of about 15 kN to 20 kN / m ² , such as a large distribution warehouse. However, the price of steel frames fluctuates sharply. Therefore, in order to stabilize the manufacturing cost, there are cases where a mixed structure (hereinafter referred to as "column RC beam S structure") in which reinforced concrete (RC) with little price fluctuation is used for the column and the steel frame (S) is used for the beam is adopted. There are many.

17 and 18 show examples of such a column RC beam S structure, which was developed by the applicant (Non-Patent Document 1). These are in a form called a beam-penetrating type, in which a steel beam 103 penetrates a reinforced concrete column 102. As shown in FIG. 17, the beams 103 intersect in a cross shape at the joint with the reinforced concrete column 102. The main bars 104 of the reinforced concrete columns 102 are arranged at the four corners separated by the beams 103. Each of the four closing plates 105 is integrated by welding with the beam 103 and is arranged so as to surround the reinforced concrete column 102. FIG. 18 shows a prior art different from that shown in FIG. In this conventional technique, instead of the closing plate 105 of FIG. 17, a shear reinforcing bar 106 arranged in the reinforced concrete column 102 and a bearing plate 107 welded to the beam 103 and abutting on the reinforced concrete column 102 are formed. It is used.

In Patent Document 1, a pair of upper and lower horizontal diaphragms are connected by a steel pipe having a length suitable for the beam formation of the steel beam, and the joint portion between the concrete column and the steel beam in which the steel pipe is integrally connected with the reinforced concrete column. The structure of is proposed. In this structure, a concrete filling hole is formed in the center of each diaphragm, and a through hole for the column main bar is formed in the outer peripheral portion. The steel beam is joined to the column outer peripheral protrusion and the outer surface of the steel pipe in each diaphragm.

JP-A-3-281844

[Online], July 3, 2009, [Search on March 11, 2019], Internet <URL: https://www.smcon.co.jp/topics/2009/0703922/>

In recent years, robot welding by a robot welding machine has been widely used for manufacturing steel frame members. However, in the conventional joint structure as shown in FIGS. 17 and 18, it is difficult to weld H-shaped steels with a robot welding machine because many H-shaped steels are welded to each other in a complicated shape. On the other hand, in the joint structure described in Patent Document 1, since the steel pipe and the diaphragm or H-shaped steel are often welded in a relatively simple shape, welding by a robot welding machine can be frequently used, and the manufacturing cost can be expected to be reduced.

Here, in order to reduce the steel frame manufacturing cost in the column RC beam S structure, it is conceivable to adopt the structure of the joint portion described in Patent Document 1. However, in the joint structure described in Patent Document 1, since the H-shaped steels arranged on both sides of the column are not continuous with each other and are joined to the steel pipes, stress is likely to be generated in the column. Further, since the cross-sectional shape changes at the connecting portion between the joint portion and the pillar portion, stress tends to be concentrated. Therefore, it is necessary to increase the cross-sectional area of the columns in order to secure a predetermined seismic strength. On the other hand, as the cross-sectional area of the column increases, the material cost and construction cost increase.

The present invention has been made in view of such a background, and provides a beam-column joint structure capable of having good workability, ensuring sufficient seismic resistance, and reducing manufacturing and construction costs, and a method for constructing the same. The purpose is.

In order to solve such a problem, the beam-column joint structure according to an embodiment of the present invention includes a concrete column (2) having a plurality of column main bars (4) and concrete (6) joined in the vertical direction. , A joint structure with a steel beam (3) having a web (7), a lower flange (8) and an upper flange (9), and the concrete column is a column body portion (11, 51) made of RC concrete. The steel beam includes a steel pipe assembly (20) arranged on the outer periphery thereof and a joint portion (12) having concrete filled inside the steel pipe assembly and forming a joint with the steel beam. , A beam main body (14) forming an intermediate portion in the material axial direction is integrally formed with the steel pipe assembly by welding, and is joined to the end of the beam main body in the material axial direction via a joint plate (15). The column body portion includes a plurality of the column main bars and a plurality of band bars (5) surrounding the plurality of column main bars, and the steel pipe assembly is the said steel beam. The lower part is made of a steel plate that extends horizontally at the heights of the lower flange and the upper flange, and has a plurality of reinforcing bar insertion holes (27) and concrete filling holes (26) for inserting the beam main bars. A joint main body (23) composed of a diaphragm (21) and an upper diaphragm (22), a steel pipe joined to an upper surface of the lower diaphragm and a lower surface of the upper diaphragm, and a joint body portion (23) extending downward from the lower surface of the lower diaphragm. It has a lower extending portion (24) made of a steel pipe, and the height dimension (H2) of the lower extending portion is larger than that of the beam formation (H1) of the steel beam.

According to this configuration, since the steel pipe assembly has a lower extension portion having a height dimension larger than that of the beam of the steel frame beam, the stress generated in the concrete column is dispersed. Therefore, it is possible to reduce the cross-sectional area of the concrete column while ensuring sufficient seismic resistance. Thereby, the material cost and the construction cost can be reduced. Further, since the steel pipe assembly can be manufactured by welding a relatively simple shape, the steel frame manufacturing cost can be reduced.

In the above configuration, the pillar body portions (11, 51) may be made of PCa concrete.

According to this configuration, since the concrete column is composed of a column body portion made of PCa (precast) concrete and a joint portion, the workability is good and the construction period can be shortened. Further, since the steel pipe assembly has a lower extension portion and an upper extension portion, the length of the column main body portion can be shortened. By reducing the cross-sectional area and shortening the length, the weight of the column main body is reduced, so that the cost of the lifting machine and the transportation cost can be reduced.

In the above configuration, the column main body portions (11, 51) further have a reinforcing bar joint member (17) arranged at the lower end of the column main bar (4), and the column main bar embedded in the column main bar is It is preferable that the column body extends upward from the upper surface of the column body, penetrates the joint (12), and is connected to the reinforcing bar joint member of the column body on the upper floor.

According to this configuration, it is not necessary to provide a joint of the column main bar inside the steel pipe assembly, and the workability can be improved.

In the above configuration, a plurality of lower end reinforcing bar guide holes (37) and lower end concrete filling holes (38) through which the column main bars (4) are inserted are formed on the inner surface of the lower portion of the lower extending portion (24). It is preferable that the reinforcing bar guide plate (36) is joined.

According to this configuration, when the steel pipe assembly is built, a plurality of column main bars are guided by the lower end reinforcing bar guide holes, which facilitates the positioning of the steel pipe assembly and allows the multiple column main bars to be inserted into the reinforcing bar insertion holes of the lower diaphragm. It will be easier to insert.

In the above configuration, a guide member (39) for determining a horizontal position with respect to the upper end of the pillar body portion (11, 51) is provided on the outer surface of the lower end of the lower extension portion (24). It is good to be there.

According to this configuration, when the steel pipe assembly is built, the horizontal positioning of the steel pipe assembly can be easily performed. Further, when concrete is cast inside the steel pipe assembly, it is possible to prevent the steel pipe assembly from shifting to a horizontal position.

In the above configuration, the upper extending portion (25) made of a steel pipe extending upward from the upper surface of the upper diaphragm is further provided, and the height dimension (H3) of the upper extending portion is the beam formation of the steel frame beam (H3). It should be larger than H1).

According to this configuration, the stress generated in the concrete column is further dispersed. Therefore, the cross-sectional area of the concrete column can be made smaller while ensuring sufficient seismic resistance.

In the above configuration, a reinforcing bar having a plurality of upper end reinforcing bar guide holes (32) and upper end concrete filling holes (33) formed on the inner surface of the upper portion of the upper extending portion (25) through which the column main reinforcing bar (4) is inserted. It is preferable that the holding plate (31) is joined.

According to this configuration, even if the steel pipe assembly has an upper extension with a height dimension larger than that of the steel beam, multiple column main bars are placed in appropriate positions above the upper extension. Can be held.

In the above configuration, the steel pipe assembly (20) and the lower brace mounting plate (41) joined to the lower flange (8) of the beam end portion (13) and the lower extending portion (24). It is preferable to further have at least one of the upper flange (9) of the beam end portion and the upper brace mounting plate (42) joined to the upper extending portion (25).

According to this configuration, the brace mounting plate can be mounted on the outside of the concrete column with high mounting rigidity. In addition, the brace can be attached at an effective position where the extension line of the brace passes through the intersection of the concrete column and the steel beam (the intersection of the axes).

The method for constructing the beam-column joint structure having the above configuration includes a step of preparing a plurality of column main bodies (11) made of PCa concrete, the steel pipe assembly (20), and the beam main body (14), and a predetermined method. The step of building the column body at the position (FIG. 10 (A)) and the step of building the steel pipe assembly on the built-in column body (FIG. 10 (B)). The step of joining the beam main body to the beam end (13) of the steel pipe assembly by the joint plate (15) (FIG. 10 (C)) and the inside of the steel pipe assembly to which the beam main body is joined. In the step (FIG. 11 (D)) of placing concrete (6) into the joint to construct the joint (12), and building the pillar main body on the upper floor on the constructed joint. It is preferable to include a step (FIG. 11 (E)) and a step (FIG. 11 (F)) of filling the grout between the joint portion and the pillar main body portion on the upper floor.

According to this configuration, concrete is placed inside the steel pipe assembly for each layer. Therefore, the rigidity of the skeleton is not insufficient when constructing the skeleton on the upper floor, and the construction can be carried out safely.

A method for constructing a column-beam joint structure having the above configuration includes a plurality of the column main bodies (51) made of PCa concrete having hollow holes (52) penetrating in the vertical direction, and a plurality of the steel pipe assemblies (20). , A step of preparing a plurality of the beam main bodies (14), and a first step (FIG. 14 (A)) of building the column main body on the steel pipe assembly arranged at a predetermined position. The second step (FIG. 14 (B)) of building the steel pipe assembly on the built-in column main body, and the joint plate (15) on the beam end (13) of the built-in steel pipe assembly. A third step (FIG. 14 (C)) for joining the beam main body portion and a step (FIG. 15 (D)) for repeating the first step, the second step, and the third step are continuous in the vertical direction. A step (FIG. 15 (E)) of placing concrete (6) inside the hollow holes of the plurality of column main bodies and the plurality of steel pipe assemblies, and a step provided in the column main body on the lower floor. It is preferable to include a step (FIG. 15 (F)) of joining the column main bar (4) to the column main bar provided in the column main body on the upper floor.

According to this configuration, concrete can be placed inside the steel pipe assembly at the same time over a plurality of floors, so that workability can be improved.

As described above, according to the present invention, it is possible to provide a beam-column joint structure capable of improving workability and a method for constructing the same.

Perspective view of the column RC beam S structure according to the first embodiment Front view of the column RC beam S structure shown in FIG. Section III-III sectional view in FIG. IV-IV cross-sectional view in FIG. VV cross-sectional view in FIG. Vertical cross-sectional view of the upper part of the joint shown in FIG. Longitudinal sectional view of the lower part of the joint shown in FIG. Front view of the main part of the column RC beam S structure according to the modified example Schematic front view showing the main part of the building of the pillar RC beam S structure shown in FIG. Schematic diagram showing the construction method of the column RC beam S structure shown in FIG. Schematic diagram showing the construction method of the column RC beam S structure shown in FIG. Front view of column RC beam S structure according to the second embodiment XIII-XIII sectional view in FIG. Schematic diagram showing the construction method of the column RC beam S structure shown in FIG. Schematic diagram showing the construction method of the column RC beam S structure shown in FIG. Front view of column RC beam S structure according to the third embodiment Perspective view of the prior art Perspective view of the prior art

Hereinafter, the joint structure of the concrete column 2 and the steel beam 3 according to the present invention will be described in detail with reference to the drawings.

<First Embodiment>
First, the first embodiment of the present invention will be described with reference to FIGS. 1 to 11. FIG. 1 is a perspective view of a column RC beam S structure 1 according to a first embodiment of the present invention. As shown in FIG. 1, the column RC beam S structure 1 according to the first embodiment includes a concrete column 2 and a plurality of steel frame beams 3 joined to the concrete column 2. The concrete pillar 2 is an RC square pillar-shaped member made of precast concrete or cast-in-place concrete. The concrete column 2 has a plurality of column main bars 4 joined in the vertical direction, a band bar 5 (FIG. 2) surrounding the column main bars 4, and concrete 6 in which these reinforcing bars are embedded. The steel beam 3 is a member made of H-shaped steel having a web 7, a lower flange 8 and an upper flange 9.

The concrete column 2 includes a column main body portion 11 made of RC concrete or PCa concrete, and a joint portion 12 forming a joint portion with the steel frame beam 3, and these are alternately stacked. The column main body portion 11 may be a member made of PCa concrete, or may be constructed by cast-in-place concrete. In the following description, it is assumed that the column main body 11 is made of PCa concrete.

The steel beam 3 has a portion between a pair of beam end portions 13 and a pair of beam end portions 13 integrally formed by welding at the joint portion 12 of the concrete column 2, that is, an intermediate portion in the material axis direction. It includes a beam main body portion 14. The beam body portion 14 is joined to the beam end portion 13 via a joint plate 15 (splice plate) at both ends in the material axial direction. In this example, four steel beams 3 are joined to each side surface of the concrete column 2. In another example, one, two, or three steel beams 3 may be joined to the side surface of the concrete column 2.

FIG. 2 is a front view of the column RC beam S structure 1 shown in FIG. 1, and FIGS. 3 to 5 are a sectional view of III-III, a sectional view of IV-IV, and a sectional view of VV in FIG. .. In FIG. 2, the reinforcing bars arranged in the column main body 11 are shown by solid lines as if the concrete 6 was seen through, and the reinforcing bars arranged in the joint 12 are not shown. A slab 16 is constructed on the steel beam 3 as shown by an imaginary line.

As shown in FIGS. 2 and 3, the column main body portion 11 includes a plurality of column main bars 4 extending in the vertical direction and a band bar 5 surrounding the column main bars 4. The pillar main body portion 11 is formed to have a length (height) slightly smaller than the value obtained by subtracting the height of the joint portion 12 from the floor height. The column main bar 4 embedded in the column body 11 is provided with a reinforcing bar joint member 17 arranged at the lower end of the column body 11 at the lower end, and extends upward from the upper end of the column body 11, and is a joint portion 12 It is connected to the reinforcing bar joint member 17 of the column main body 11 on the upper floor through the above. That is, the column main bars 4 provided in the column body 11 adjacent to each other in the vertical direction are joined in the vertical direction by the reinforcing bar joint member 17 to form continuous reinforcing bars.

As shown in FIGS. 1 and 2, a plurality of joint portions 12 are joined to the outer surface of the steel pipe assembly 20 and the steel pipe assembly 20 arranged on the outer peripheral portion of the concrete column 2 by welding (four in this example). The beam end portion 13 of the above is provided. A plurality of column main bars 4 penetrate inside the steel pipe assembly 20, and no band bars 5 are provided. The joint portion 12 is constructed by filling the inside of the steel pipe assembly 20 with concrete 6 inside the steel pipe assembly 20. That is, the joint portion 12 is a CFT with a built-in reinforcing bar similar to a CFT (Concrete Filled Steel Tube).

As shown in FIG. 9, the pillar main body portion 11 of the upper floor is stacked on the joint portion 12, and the joint portion 12 of the upper floor is further stacked on the joint portion 12. Therefore, the column RC beam S structure 1 has a structure in which an RC structure in which the column main bars 4 are continuous in the vertical direction and a CFT with a built-in reinforcing bar in which the column main bars 4 are built are repeated.

As shown in FIGS. 1, 2, 4 and 5, the steel pipe assembly 20 includes a lower diaphragm 21 in which the lower flanges 8 of the plurality of beam end portions 13 are welded to the outer peripheral surface, and the plurality of beam end portions 13. The upper flange 9 is provided with an upper diaphragm 22 welded to the outer peripheral surface. The lower diaphragm 21 and the upper diaphragm 22 are made of steel plates having the same thickness, have the same shape with a quadrangular outer contour, and extend horizontally in parallel with each other.

Further, the steel pipe assembly 20 includes a joint main body portion 23 welded to the upper surface of the lower diaphragm 21 and the lower surface of the upper diaphragm 22, a welded lower extending portion 24 on the lower surface of the lower diaphragm 21, and the upper diaphragm 22. It is further provided with an upper extending portion 25 welded to the upper surface. The joint main body portion 23, the lower extending portion 24, and the upper extending portion 25 are made of square tubular steel pipes having the same plate thickness and have the same cross-sectional shape. The lower extending portion 24 extends downward from the lower surface of the lower diaphragm 21, and the upper extending portion 25 extends upward from the upper surface of the upper diaphragm 22. The web 7 of the beam end portion 13 is joined to the side surface of the joint main body portion 23 by welding.

The height of the joint body 23 is substantially the same as the height of the web 7 of the steel beam 3, and the height between the lower surface of the lower diaphragm 21 and the upper surface of the upper diaphragm 22 is the beam formation H1 of the steel beam 3 (FIG. 2). ) Is almost the same. The height dimension H2 of the lower extending portion 24 and the height dimension H3 of the upper extending portion 25 are larger than the height of the joint main body 23 and larger than the beam formation H1 of the steel frame beam 3. The lower diaphragm 21 and the upper diaphragm 22 have an outer contour slightly larger than the cross section of the joint main body portion 23, the lower extending portion 24, and the upper extending portion 25. The lower extending portion 24 is joined to the lower surface of the lower diaphragm 21 by welding, and the upper extending portion 25 is joined to the upper surface of the upper diaphragm 22 by welding.

As shown in FIG. 5, a concrete filling hole 26 is formed in the center of the lower diaphragm 21 and the upper diaphragm 22. The concrete filling hole 26 may be circular or square. A plurality of reinforcing bar insertion holes 27 for inserting the column main bars 4 are formed on the outer peripheral portions of the lower diaphragm 21 and the upper diaphragm 22.

FIG. 6 is a vertical cross-sectional view of the upper portion of the joint portion 12 shown in FIG. As shown in FIGS. 1 and 6, a reinforcing bar holding plate 31 is joined to the inner surface of the upper portion of the upper extending portion 25 by welding. The reinforcing bar holding plate 31 is formed with a plurality of upper end reinforcing bar guide holes 32 and upper end concrete filling holes 33 through which the column main bars 4 are inserted. A plurality of support members 34 are welded below the reinforcing bar holding plate 31, and the reinforcing bar holding plate 31 is welded to the upper extending portion 25 in a state of being supported by these support members 34.

FIG. 7 is a vertical cross-sectional view of the lower portion of the joint portion 12 shown in FIG. As shown in FIG. 7, a reinforcing bar guide plate 36 is joined to the inner surface of the lower portion of the lower extending portion 24 by welding. The reinforcing bar guide plate 36 is formed with a plurality of lower end reinforcing bar guide holes 37 and lower end concrete filling holes 38 through which the column main bars 4 are inserted.

At the lower end of the lower extending portion 24, a guide member 39 for determining a position in the horizontal direction with respect to the upper end of the lower pillar main body portion 11 is provided (not shown in FIGS. 1 and 2 and the like). The guide member 39 may be joined to the side surface of the lower extending portion 24 by welding, or may be configured as a removable band. Further, the guide member 39 may be formed on the side surface of the lower extending portion 24 over the entire circumference, or may be composed of a plurality of members partially provided on the side surface. Alternatively, an annular notch corresponding to the lower extending portion 24 may be formed at the upper end of the pillar main body portion 11, and the lower end of the lower extending portion 24 may function as a guide member 39.

A cotter 29 is formed on the upper surface of the pillar body 11. The cotter 29 may be formed in a concave shape that is recessed downward as shown in the figure, or may be formed in a convex shape that protrudes upward. By forming the cotter 29 on the upper surface of the pillar main body 11, the integrity between the pillar main body 11 and the joint 12 is enhanced.

FIG. 8 is a front view of a main part of the column RC beam S structure 1 according to the modified example. In this example, the steel pipe assembly 20 further includes a lower brace mounting plate 41 and an upper brace mounting plate 42. The steel pipe assembly 20 may include only one of the lower brace mounting plate 41 and the upper brace mounting plate 42. The lower brace mounting plate 41 is joined to the lower surface of the lower flange 8 of the beam end portion 13 and the side surface of the lower extending portion 24 by welding. Since the lower surface of the lower flange 8 and the side surface of the lower extending portion 24 are orthogonal to each other, the lower brace mounting plate 41 is mounted with high mounting rigidity. The upper brace mounting plate 42 is joined to the upper surface of the upper flange 9 of the beam end portion 13 and the side surface of the upper extending portion 25 by welding. Since the upper surface of the upper flange 9 and the side surface of the upper extending portion 25 are orthogonal to each other, the upper brace mounting plate 42 is mounted with high mounting rigidity.

One end of the brace 43 provided on the corresponding layer (lower layer) is joined to the lower brace mounting plate 41 by a bolt. One end of the brace 43 provided on the upper floor is joined to the upper brace mounting plate 42 by a bolt. By providing the lower brace mounting plate 41 and the upper brace mounting plate 42, these braces 43 are in an effective position where the extension line passes through the intersection (intersection of the axes) between the concrete column 2 and the steel beam 3. Can be attached to.

The column-beam joint structure of the column RC beam S structure 1 is configured as described above. As shown in FIGS. 2 and 9, the steel pipe assembly 20 has a lower extending portion 24 in addition to the joint main body portion 23, and the height dimension H2 of the lower extending portion 24 is the steel beam 3 It is larger than the beam assembly H1 of. Therefore, the stress generated in the concrete column 2 is dispersed. Therefore, it is possible to reduce the cross-sectional area of the concrete column 2 while ensuring sufficient seismic resistance. This reduces material costs and construction costs. Further, since the steel pipe assembly 20 can be manufactured by welding a relatively simple shape, the steel frame manufacturing cost is reduced.

Further, the steel pipe assembly 20 further has an upper extending portion 25, and the height dimension H3 of the upper extending portion 25 is larger than the beam formation H1 of the steel frame beam 3. Therefore, the stress generated in the concrete column 2 is further dispersed. Therefore, it is possible to make the cross-sectional area of the concrete column 2 smaller while ensuring sufficient seismic resistance.

Further, in the present embodiment, the concrete pillar 2 is composed of a pillar main body portion 11 and a joint portion 12 made of PCa concrete. Therefore, as will be described later, the workability is good and the construction period can be shortened. Further, since the steel pipe assembly 20 has the lower extending portion 24 and the upper extending portion 25, the length of the column main body portion 11 is shortened. By reducing the cross-sectional area and shortening the length, the weight of the column main body 11 is reduced, so that the cost of the lifting machine and the transportation cost are also reduced.

Next, a method of constructing the column RC beam S structure 1 will be described with reference to FIGS. 10 and 11. Here, the construction procedure for one layer above the bottom layer will be described. On the lowest floor, the pillar body 11 is built on the foundation. Therefore, even if the floor height is the same as that of the other floors, the pillar body 11 that is longer than that of the other floors is used. Prior to the on-site construction, a plurality of column main bodies 11, a steel pipe assembly 20, and a beam main body 14 are prepared. The pillar body 11 is manufactured as a precast member at the factory. The steel pipe assembly 20 is manufactured by robot welding at the factory.

Next, as shown in FIG. 10A, the pillar main body portion 11 is built at a predetermined position, that is, on the joint portion 12 on the lower floor. Since the method of fixing the pillar body 11 will be described in detail later, the description thereof is omitted here.

Next, as shown in FIG. 10B, the steel pipe assembly 20 is built on the column body 11. The plurality of column main bars 4 extending upward from the upper surface of the column body 11 include the lower end reinforcing bar guide holes 37 (FIGS. 4 and 7) of the reinforcing bar guide plate 36, and the reinforcing bar insertion holes 27 (reinforcing bar insertion holes 27) of the lower diaphragm 21 and the upper diaphragm 22. FIG. 5) and the upper end reinforcing bar guide hole 32 (FIGS. 6 and 1) of the reinforcing bar holding plate 31 are passed in order. The plurality of column main bars 4 penetrate the steel pipe assembly 20 and extend further upward from the upper end of the steel pipe assembly 20.

As shown in FIGS. 4 and 7, since the reinforcing bar guide plate 36 is provided at the lower part of the lower extending portion 24, when the steel pipe assembly 20 is built, a plurality of column main bars 4 are provided with the lower end reinforcing bar guide holes 37. Guided by. Therefore, the steel pipe assembly 20 can be easily positioned, and a plurality of column main bars 4 can be easily inserted into the reinforcing bar insertion holes 27 of the lower diaphragm 21. Further, as shown in FIGS. 1 and 2, since the reinforcing bar holding plate 31 is provided above the upper extending portion 25, the steel pipe assembly 20 has a height dimension H3 larger than that of the beam forming H1 of the steel frame beam 3. Even if the upper extending portion 25 is provided, a plurality of column main bars 4 are arranged and held at appropriate positions on the upper portion of the upper extending portion 25. Further, as shown in FIG. 7, since the guide member 39 is provided at the lower end of the lower extending portion 24, the steel pipe assembly 20 can be easily positioned in the horizontal direction when the steel pipe assembly 20 is built. it can.

Next, as shown in FIG. 10C, the beam body portion 14 is joined to the beam end portion 13 of the steel pipe assembly 20 by the joint plate 15. Both ends of the beam body 14 are joined to the steel pipe assembly 20 of a pair of concrete columns 2 adjacent to each other.

Next, as shown in FIG. 11 (D), concrete 6 is placed inside the steel pipe assembly 20. As a result, the joint portion 12 is constructed. The concrete 6 includes an upper end concrete filling hole 33 (FIG. 1) of the reinforcing bar holding plate 31, a concrete filling hole 26 (FIG. 5) of the upper diaphragm 22 and the lower diaphragm 21, and a lower end concrete filling hole of the reinforcing bar guide plate 36. It is driven through 38 (FIGS. 4 and 7) (or by a hose passing through them).

As shown in FIG. 7, since the guide member 39 is provided at the lower end of the lower extending portion 24, the steel pipe assembly 20 is positioned in the horizontal direction when the concrete 6 is placed inside the steel pipe assembly 20. Prevents slippage. Further, as shown in FIGS. 1 and 2, since the reinforcing bar holding plate 31 is provided above the upper extending portion 25, when the concrete 6 is cast inside the steel pipe assembly 20, the column main bar It is prevented that 4 is displaced to the horizontal position.

Next, as shown in FIG. 11 (E), the pillar main body portion 11 of the upper floor is built on the constructed joint portion 12. As shown in FIGS. 1 and 2, the plurality of column main bars 4 extending upward from the upper surface of the joint portion 12 are inserted into the reinforcing bar joint member 17 provided at the lower end of the column main body portion 11 on the upper floor. To. A gap 44 for injecting grout is formed by arranging a spacer member or the like between the upper surface of the joint portion 12 and the lower surface of the pillar body portion 11.

Finally, as shown in FIG. 11F, the grout 45 is filled in the gap 44 between the joint portion 12 and the column main body portion 11 on the upper floor and the inside of the reinforcing bar joint member 17. As a result, the pillar main body 11 on the upper floor is fixed to the joint 12. Further, a plurality of column main bars 4 are joined in the vertical direction to form continuous reinforcing bars. With the above, the construction of the column RC beam S structure 1 for one layer is completed. By repeating the above procedure, the column RC beam S structure 1 for a plurality of layers can be constructed.

The column main bar 4 embedded in the column main body 11 on the lower floor as described above extends upward from the upper surface of the column main body 11 and penetrates the joint portion 12 to penetrate the joint 12 and the reinforcing bar joint of the column main body 11 on the upper floor. It is connected to the member 17. Therefore, it is not necessary to provide the joint of the column main bar 4 inside the steel pipe assembly 20, and the workability of the reinforcing bar joint work is improved.

As described above, in the present embodiment, since the concrete is placed inside the steel pipe assembly 20 for each layer, the skeleton rigidity is not insufficient when constructing the skeleton on the upper floor, and safe construction is possible. Further, since the concrete pillar 2 is made of PCa concrete, the workability is good and the construction period can be shortened.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. 12 to 15. The same or similar configurations as those in the first embodiment are designated by the same reference numerals, and redundant description will be omitted.

FIG. 12 is a front view of the column RC beam S structure 1 according to the second embodiment of the present invention. The column RC beam S structure 1 of the present embodiment is different from the first embodiment in the configuration and construction procedure of the column main body 51 made of PCa concrete. In FIG. 12, the reinforcing bars arranged in the column main body 51 are not shown, but are arranged inside the concrete 6 as in FIG. 2. FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. As shown in FIGS. 12 and 13, a hollow hole 52 penetrating in the vertical direction is formed on the axis of the pillar body 51.

Next, a method of constructing the column RC beam S structure 1 will be described with reference to FIGS. 14 and 15. Here, the construction procedure for a plurality of layers above the bottom layer will be described. Prior to the on-site construction, a plurality of column main bodies 51 having hollow holes 52 formed therein, a plurality of steel pipe assemblies 20, and a plurality of beam main bodies 14 are prepared. The pillar body 51 is manufactured as a precast member at the factory.

Next, as shown in FIG. 14 (A), the column main body 51 is built at a predetermined position, that is, on the steel pipe assembly 20 or the joint 12 on the lower floor. Since the method of fixing the column main body 51 will be described in detail later, the description thereof is omitted here. Next, as shown in FIG. 14B, the steel pipe assembly 20 is built on the column main body 51. Next, as shown in FIG. 14C, the beam body portion 14 is joined to the beam end portion 13 of the steel pipe assembly 20 by the joint plate 15.

Next, as shown in FIG. 15 (D), the operations shown in FIGS. 14 (A) to 14 (C) are repeated at least once. As a result, the hollow holes 52 of the plurality of column main bodies 51 and the internal spaces of the plurality of steel pipe assemblies 20 are continuous in the vertical direction.

Next, as shown in FIG. 15 (E), concrete 6 is placed inside the hollow holes 52 of the plurality of column main bodies 51 and the plurality of steel pipe assemblies 20 which are continuous in the vertical direction. As a result, the column main body 51 becomes solid, and the steel pipe assembly 20 is filled with concrete 6 to construct the joint 12. The concrete 6 may be injected from the lower part of the casting area, or the concrete 6 may be poured in order from the lower part while moving the hose inserted from the upper part upward.

Next, as shown in FIG. 15 (F), a plurality of column main bars 4 provided in the column main body 51 on the lower floor are joined to the column main bars 4 provided on the column main body 51 on the upper floor. The splicing method may be performed by injecting grout 45 into the reinforcing bar joint member 17 provided at the lower end of the column main body 51 on the upper floor, as in the first embodiment. As a result, the joint portion 12 is fixed to the pillar main body portion 51, and the pillar main body portion 51 on the upper floor is fixed to the joint portion 12. Further, a plurality of column main bars 4 are joined in the vertical direction to form continuous reinforcing bars.

As described above, in the present embodiment, since the concrete 6 is placed inside the steel pipe assembly 20 at the same time over a plurality of floors, the workability is improved. Further, since the concrete pillar 2 is made of PCa concrete, the workability is good and the construction period can be shortened.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG. The same or similar configurations as those in the first embodiment are designated by the same reference numerals, and redundant description will be omitted.

FIG. 16 is a front view of the column RC beam S structure 1 according to the third embodiment of the present invention. The column RC beam S structure 1 of the present embodiment is different from the first embodiment in the configuration of the steel pipe assembly 20 and the plurality of steel beams 3 joined to the steel pipe assembly 20. Specifically, the concrete column 2 includes a first steel beam 3A having a beam structure smaller than that of the steel beam 3 of the first embodiment, and a first steel beam 3A similar to the steel beam 3 of the first embodiment. It is joined to a second steel beam 3B having a larger beam formation. The first steel beam 3A forms an intermediate portion between a pair of first beam end portions 13A and a pair of beam end portions 13 integrally formed by welding at the joint portion 12 of the concrete column 2. It includes a beam body portion 14A. Similarly, the second steel beam 3B forms an intermediate portion between a pair of second beam end portions 13B and a pair of beam end portions 13 integrally formed by welding at the joint portion 12 of the concrete column 2. The second beam main body portion 14B is included. The first steel beam 3A and the second steel beam 3B are joined to the concrete column 2 so that the heights of the upper flanges 9 of the first steel beam 3A and the second steel beam 3B are aligned with each other.

The steel pipe assembly 20 includes a first lower diaphragm 21A in which the lower flange 8 of the first steel frame beam 3A is welded to the outer peripheral surface, and a second lower diaphragm 21B in which the lower flange 8 of the second steel frame beam 3B is welded to the outer peripheral surface. The upper flange 9 of the first steel frame beam 3A and the second steel frame beam 3B is provided with an upper diaphragm 22 welded to the outer peripheral surface. The first lower diaphragm 21A and the second lower diaphragm 21B extend horizontally in parallel with each other, and have the same configuration as the lower diaphragm 21 and the upper diaphragm 22 of the first embodiment (see FIG. 5).

Further, the steel pipe assembly 20 is welded to the upper surface of the first lower diaphragm 21A and the lower surface of the upper diaphragm 22 to the first joint main body 23A, and to the upper surface of the second lower diaphragm 21B and the lower surface of the first lower diaphragm 21A. It is provided with the second welded main body 23B. The first joint main body 23A and the second joint main body 23B have the same cross-sectional shape as the joint main body 23 of the first embodiment.

The height of the first joint main body 23A is substantially the same as the height of the web 7 of the first steel beam 3A, and the total of the first joint main body 23A, the first lower diaphragm 21A, and the second joint main body 23B. The height is substantially the same as the height of the web 7 of the second steel beam 3B. The height between the lower surface of the first lower diaphragm 21A and the upper surface of the upper diaphragm 22 is substantially the same as the beam formation H4 of the first steel frame beam 3A. The height between the lower surface of the second lower diaphragm 21B and the upper surface of the upper diaphragm 22 is substantially the same as the beam formation H1 of the second steel frame beam 3B. Regarding the first steel beam 3A, the second joint main body portion 23B functions to disperse stress in the same manner as the lower extension portion 24. That is, with respect to the first steel beam 3A, it can be said that the portion having a height dimension H5 from the lower surface of the first lower diaphragm 21A to the lower end of the lower extending portion 24 is the lower extending portion 24. Both the height dimension H5 and the height dimension H2 of the lower extending portion 24 are larger than the beam formation H1 of the second steel frame beam 3B. Therefore, the same effect as that of the first embodiment is achieved.

Although the description of the specific embodiment is completed above, the present invention can be widely modified without being limited to the above embodiment. For example, in the above embodiment, the steel pipe assembly 20 includes the upper extension portion 25, but the steel pipe assembly 20 may not include the upper extension portion 25. Further, the plate thickness of the upper extending portion 25 is the same as the plate thickness of the joint main body portion 23 and the lower extending portion 24, but it may be thinner than these plate thicknesses. In addition, the specific configuration, arrangement, quantity, angle, etc. of each member or portion can be appropriately changed as long as it does not deviate from the gist of the present invention. On the other hand, not all of the constituent elements shown in the above embodiments are indispensable, and they can be appropriately selected. In addition, the above embodiments can be combined as appropriate.

1 Pillar RC beam S structure 2 Concrete pillar 3 Steel beam, 3A 1st steel beam, 3B 2nd steel beam 4 Pillar main bar 5 Band bar 6 Concrete 7 Web 8 Lower flange 9 Upper flange 11 Pillar body 12 Joint 13 beam End, 13A 1st beam end, 13B 2nd beam end 14 Beam body, 14A Beam body, 14B Beam body 15 Joint plate 16 Slab 17 Reinforcement joint member 20 Steel pipe assembly 21 Lower diaphragm, 21A 1st lower Diaphragm, 21B 2nd lower diaphragm 22 Upper diaphragm 23 Joint body part 24 Lower extension part 25 Upper extension part 26 Concrete filling hole 27 Reinforcing bar insertion hole 29 Cotter 31 Reinforcing bar holding plate 32 Upper end Reinforcement guide hole 33 Upper end concrete filling Hole 34 Support member 36 Reinforcing bar guide plate 37 Lower end reinforcing bar guide hole 38 Lower end concrete filling hole 39 Guide member 41 Lower brace mounting plate 42 Upper brace mounting plate 43 Brace 51 Pillar body 51 Hollow hole H1 Beam beam 3 , Beam formation of 2nd steel beam 3B H2 Height dimension of lower extension part 24 H3 Height dimension of upper extension part 25 H4 Beam formation of 1st steel beam 3A H5 Lower extension for 1st steel beam 3A Height dimension of the protrusion 24

Claims (10)

It is a joint structure of a concrete column having a plurality of column main bars and concrete jointed in the vertical direction and a steel beam having a web, an upper flange and a lower flange.
The concrete column has a column main body made of RC concrete, a steel pipe assembly arranged on the outer peripheral portion, and concrete filled inside the steel pipe assembly, and has a joint portion forming a joint with the steel beam. Including
The steel beam is integrally formed with a beam body portion forming an intermediate portion in the material axis direction by welding to the steel pipe assembly, and is joined to the end portion of the beam body portion in the material axis direction via a joint plate. Including the end
The column main body portion has a plurality of the column main bars and a plurality of band bars surrounding the column main bars.
The steel pipe assembly
A lower diaphragm made of a steel plate extending horizontally at the heights of the lower flange and the upper flange of the steel beam, and having a plurality of reinforcing bar insertion holes and concrete filling holes for inserting the column main bars. And the upper diaphragm,
A joint main body made of steel pipes joined to the upper surface of the lower diaphragm and the lower surface of the upper diaphragm, and
It has a lower extending portion made of a steel pipe extending downward from the lower surface of the lower diaphragm.
A column-beam joint structure characterized in that the height dimension of the lower extending portion is larger than the beam formation of the steel frame beam. The column-beam joint structure according to claim 1, wherein the column body is made of PCa concrete. The column main body further has a reinforcing bar joint member arranged at the lower end of the column main bar.
The column main bar embedded in the column body extends upward from the upper surface of the column body, penetrates the joint, and is connected to the reinforcing bar joint member of the column body on the upper floor. The column-beam joint structure according to claim 1 or 2, wherein the column-beam joint structure is provided. Claim 1 is characterized in that a reinforcing bar guide plate having a plurality of lower end reinforcing bar guide holes through which the column main bar is inserted and a lower end concrete filling hole is formed on the inner surface of the lower portion of the lower extending portion. The column-beam joint structure according to any one of claims 3. Any of claims 1 to 4, wherein a guide member for determining a horizontal position with respect to the upper end of the pillar body is provided on the outer surface of the lower end of the lower extending portion. Column-beam joint structure described in Crab. Further having an upper extending portion made of a steel pipe extending upward from the upper surface of the upper diaphragm.
The column-beam joint structure according to any one of claims 1 to 5, wherein the height dimension of the upper extending portion is larger than the beam formation of the steel frame beam. The sixth aspect of claim 6 is characterized in that a reinforcing bar holding plate having a plurality of upper end reinforcing bar guide holes and upper end concrete filling holes formed through which the column main bars are inserted is joined to the inner surface of the upper portion of the upper extending portion. The described column-beam joint structure. The steel pipe assembly is joined to a lower brace mounting plate joined to the lower flange of the beam end portion and the lower extending portion, and to the upper flange of the beam end portion and the upper extending portion. The beam-column joint structure according to claim 6 or 7, further comprising at least one of the upper brace mounting plate. The method for constructing a beam-column joint structure according to any one of claims 1 to 8.
A step of preparing a plurality of column main bodies made of PCa concrete, a steel pipe assembly, and a beam main body.
Steps to build the pillar body at a predetermined position,
The step of building the steel pipe assembly on the built-in column body,
A step of joining the beam body portion to the beam end portion of the built-in steel pipe assembly by the joint plate, and
A step of placing concrete inside the steel pipe assembly to which the beam main body is joined to construct the joint, and
The step of building the pillar body on the upper floor on the constructed joint,
A method for constructing a beam-column joint structure, which comprises a step of filling grout between the joint portion and the column main body portion of the upper floor. The method for constructing a beam-column joint structure according to any one of claims 1 to 8.
A step of preparing a plurality of column main bodies made of PCa concrete having hollow holes formed in the vertical direction, a plurality of steel pipe assemblies, and a plurality of beam main bodies.
The first step of building the column body on the steel pipe assembly arranged at a predetermined position, and
The second step of building the steel pipe assembly on the built-in column body, and
A third step of joining the beam body portion to the beam end portion of the built-in steel pipe assembly by the joint plate, and
A step of repeating the first step, the second step, and the third step, and
A step of placing concrete inside the hollow holes of the column main body and the steel pipe assemblies which are continuous in the vertical direction.
A method for constructing a beam-column joint structure, which comprises a step of joining the column main bar provided in the column main body portion of the lower floor to the column main bar provided in the column main bar of the upper floor.

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