JP2022107306A - RCS junction structure - Google Patents

Abstract

To provide an RCS junction structure capable of correcting a settlement of streaks, restricting an enlargement of a cross section of a column and also distributing a load applied to the column.SOLUTION: An RCS junction structure 1 comprises: a pair of outer diaphragms 13 each having an opening part 16 and each junction part 17 extending radially from the opening part 16 and jointed with each beam 3, and arranged at an interval along a vertical direction; and a tubular member 19 inserted along an inner wall surface of the opening part 16 of each outer diaphragm 13 and having a column 2 arranged inside. The tubular member 19 projects toward the vertical direction from the pair of upper and lower outer diaphragms 13. This allows a plurality of main reinforcements 50 in the column 2 to be arranged in a substantially equal interval along a circumferential direction in the tubular member 19, thus an enlargement of a cross section of the column 2 can be restricted. Also, the tubular member 19 can distribute a load applied to the column 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to an RCS joining structure formed by joining a plurality of steel-framed (S) beams to a reinforced concrete (RC or PCa) column.

As shown in FIG. 6, in a generally adopted RCS joint structure, beams 3 and 3 made of H steel having a pair of upper and lower flanges 6 and 6 and a web 7 are penetrated through a column 2 and are formed inside each other. A structure is formed in which a plurality of main reinforcing bars 50, 50 extending in the vertical direction are arranged at the four corners of the column 2 so as to avoid the beams 3 and 3 by welding and joining them at right angles. The webs 7 and 7 of the adjacent beams 3 and 3 are joined to the webs 7 and 7 having an L-shaped cross section by welding. Further, a plurality of reinforcing bars 60, 60 are arranged on the plurality of main reinforcing bars 50, 50 at intervals in the vertical direction. However, in this general RCS joint structure, the main reinforcing bars 50 and 50 are arranged at the four corners of the column 2 so as to avoid the beams 3 and 3, and the required number of reinforcing bars is arranged. Therefore, the cross section of the pillar 2 becomes large, and there is room for improvement.

In addition, as another RCS welding structure as a conventional technique, a beam made of four H steels is formed on the outer wall surface of a square tubular closing cylinder (form) so as to be orthogonal to each other without penetrating through a pillar. There is a structure that is welded and joined. In addition, a plurality of triangular ribs, diagonal stepners, and the like are arranged inside the closing cylinder. In this RCS joint structure as well, as in the conventional technique described above, the main reinforcing bars are arranged so as to avoid triangular ribs and diagonal stepners, so that the reinforcing bars are accommodated and the required number of reinforcing bars are arranged. The cross section of the pillar becomes large.

As yet another RCS joining structure as a conventional technique, a beam made of four H steels is welded to the outer wall surface of a square tubular closing cylinder (form) so as to be orthogonal to each other without penetrating the column. There is a structure in which a diaphragm is arranged inside the closing cylinder. In this RCS joint structure as well, as in the conventional technique described above, the main reinforcing bars are arranged so as to avoid the diaphragm, so that the reinforcing bars are accommodated, and the cross section of the column is formed in order to arrange the required number of reinforcing bars. growing. Further, in this RCS joint structure, when concrete is placed inside the closing cylinder as a pillar, air tends to collect behind the diaphragm, and it is not preferable in terms of strength if an internal cavity is generated.

As a conventional technique for a beam-column joint structure using an outer diaphragm, the joint structure described in Patent Document 1 is in contact with a steel pipe column filled with concrete and an outer surface of the steel pipe column, and the main surface is a horizontal plane. A pair of outer diaphragms composed of an upper diaphragm and a lower diaphragm arranged so as to surround the outer periphery of the steel pipe column, and a beam made of H-shaped steel or a reinforced concrete slab connected to the pair of outer diaphragms. The steel pipe column has a plurality of ribs extending in a spiral shape at intervals on the inner surface, and one convex bead extending in a spiral shape on the outer surface. The convex bead is composed of a steel pipe having an inner rib, and is interrupted at a position where the pair of outer diaphragms are arranged on the outer surface of the steel pipe column at intervals equal to or larger than the thickness of the pair of outer diaphragms. The bead is fitted and placed in the interrupted part.

JP-A-2017-160754

However, the joint structure described in Patent Document 1 described above is not an RCS joint structure, and columns made of reinforced concrete are not adopted. Therefore, the required number of reinforcing bars is arranged by fitting the reinforcing bars as described above. Therefore, the problem that the cross section of the column becomes large cannot be solved. Further, in the RCS joint structure, a structure in which the load from the diaphragm joined to each beam is dispersed without being concentrated on the outer wall surface of the reinforced concrete column is preferable. In short, when the load from the diaphragm is concentrated on a part of the outer wall surface of the reinforced concrete column, a part of the outer wall surface of the column is crushed, which is not preferable in terms of strength.

The present invention has been made in view of this point, and is an RCS capable of correcting the fit of the stakes, suppressing the expansion of the cross section of the column, and distributing the load applied to the column. It is an object of the present invention to provide a bonded structure.

As a means for solving the above problems, the invention of claim 1 is an RCS joint structure in which a plurality of steel beams are joined to a reinforced concrete column, and is an opening and radial from the opening. Along the inner wall surface of the opening of the pair of outer diaphragms and the pair of outer diaphragms, which have each joint portion extending to and joined to each of the beams, and which are provided with a pair of outer diaphragms at intervals in the vertical direction. A tubular tubular member that is inserted and the pillar is arranged therein is provided, and the tubular member is configured to be vertically projected from the pair of upper and lower outer diaphragms. It is a thing.
In the invention of claim 1, since the column is arranged in the tubular member inserted in the opening of the pair of upper and lower outer diaphragms, a plurality of reinforcing bars extending in the vertical direction in the column are formed around the tubular member. Reinforcing bars can be arranged at approximately the same intervals along the direction, and the reinforcing bars can be corrected. As a result, the expansion of the cross section of the column can be suppressed. Further, in the invention of claim 1, a tubular member is provided which is inserted into an opening of a pair of upper and lower outer diaphragms, and the tubular member projects from the pair of upper and lower outer diaphragms in the vertical direction. As a result, the load from the outer diaphragm can be distributed to the outer wall surface of the reinforced concrete column, and it is possible to suppress the occurrence of crushing on a part of the outer wall surface of the column.

The invention according to claim 2 is the invention according to claim 1, wherein a plurality of main reinforcing bars extending in the vertical direction in the column are close to the inner wall surface of the tubular member in the circumferential direction thereof. It is characterized in that it is arranged and configured at substantially the same interval.
In the invention of claim 2, a necessary number of reinforcing bars can be arranged at appropriate positions without fitting the reinforcing bars, and the expansion of the cross section of the column can be suppressed.

A third aspect of the present invention is the invention according to the first or second aspect, wherein the outer diaphragm is formed by joining a plurality of divided members having the same shape to each other.
When the outer diaphragm is formed by cutting out an opening from a single plate material, the cut out portion is discarded. As a result, in the outer diaphragm, the volume of the opening is larger than the volume of the entire joint, so the volume of the part to be discarded is larger than the volume of the part to be used, and the productivity from the material is very high. bad. In view of this situation, in the invention of claim 3, since a plurality of dividing members having the same shape are joined to each other to form an outer diaphragm, it is possible to suppress the portion to be discarded from the material as much as possible, and production in terms of cost and the like. Efficiency can be increased.

The invention of claim 4 is the invention according to any one of claims 1 to 3, characterized in that it includes a connecting plate material for connecting the joint portions of the pair of upper and lower outer diaphragms.
For example, when joining a beam made of H steel and a pair of upper and lower outer diaphragms, a pair of upper and lower flanges are provided at the longitudinal end of the beam in the joining range with the joint of the outer diaphragms. It is necessary to form a part where only the web extends without. Then, the longitudinal end face of the beam flange and the end face of the joint portion of the outer diaphragm are brought into contact with each other and welded together at that portion, and the upper outer diaphragm is placed on the upper surface of the beam web (the range in which the flange is not formed). The lower surface of the joint must be brought into contact with the lower surface of the web (the area where the flange is not formed), and the upper surface of the lower outer diaphragm joint must be brought into contact with each other by welding. The work becomes complicated. In view of this situation, in the invention of claim 3, by providing the connecting plate material, it becomes easy to join the pair of upper and lower outer diaphragms and the longitudinal end portion of the beam.

The invention of claim 5 is the invention of claim 4, wherein the beam is made of H steel, the connecting plate material is bolted to the web of the beam via a connecting plate, and the joint is formed. , It is characterized in that it is welded to the flange of the beam.
In the invention of claim 5, in particular, since the connecting plate material can be bolted to the web of the beam via the connecting plate, the pair of upper and lower outer diaphragms including the tubular member and the longitudinal end portion of the beam are used at the construction site. Can be easily joined and the construction period can be shortened.

In addition to the constituent requirements according to the inventions of claims 1 to 5 described above, a cross-shaped reinforcing web extending in the vertical direction may be arranged in the tubular member. Thereby, the RCS joint structure can be reinforced.

According to the RCS joint structure according to the present invention, it is possible to correct the fit of the barbs, suppress the expansion of the cross section of the column, and disperse the load applied to the column.

FIG. 1 is a schematic perspective view showing an RCS joining structure according to the present embodiment. FIG. 2 is a vertical cross-sectional view of the RCS joint structure of FIG. FIG. 3A is a plan view of an outer diaphragm formed by joining a plurality of dividing members to each other, and FIG. 3B is a plan view of the dividing members. FIG. 4 is a plan view showing a cross-shaped reinforcing web provided in the tubular member. FIG. 5 is a diagram showing step by step the construction method of the RCS joint structure according to the present embodiment. FIG. 6 is a schematic perspective view showing a conventional RCS joining structure.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS. 1 to 5.
The RCS joining structure 1 according to the present embodiment is applied when joining a plurality of steel-framed (S-structured) beams 3 to a reinforced concrete (RC-structured or PCa-structured) column 2. As shown in FIG. 1, in the present embodiment, the cross-sectional shape of the pillar 2 is formed to be substantially rectangular. For the beam 3, H steel composed of a pair of upper and lower flanges 6 and 6 and a web 7 erected between the flanges 6 and 6 is adopted.

As shown in FIG. 1, in the RCS joining structure 1 according to the present embodiment, a pair of upper and lower outer diaphragms 13 and 13 located at intervals in the vertical direction are adopted. The outer diaphragm 13 is made of a steel plate. The outer diaphragm 13 includes an opening 16 through which the pillar 2 is inserted, and a plurality of joints 17 extending radially from the opening 16.

The opening 16 is formed in a substantially rectangular shape in a plan view corresponding to the cross-sectional shape of the pillar 2. In the present embodiment, the joint portion 17 extends from each inner wall surface of the opening portion 16 in four directions orthogonal to each other. The joint portion 17 is formed in a trapezoidal shape in which the width and length thereof gradually decrease from the opening 16 toward the outside. That is, the outer diaphragm 13 has an opening 16 in the center, and the outer shape thereof is formed into an octagonal shape in a plan view by forming each joint portion 17. As shown in FIG. 3, the outer diaphragm 13 may be configured by joining a plurality of dividing members 18 and 18 having the same shape to each other. In this embodiment, four dividing members 18 are prepared. The dividing member 18 is generally formed in a shape in which the trapezoidal portion 18a and the triangular portion 18b are connected.

Then, the outer diaphragm 13 has an opening 16 formed in the center, and four dividing members 18 and 18 are formed around the outer diaphragm 13, and the corresponding side of the trapezoidal portion 18a corresponds to the triangular portion 18b. It is constructed by bringing one side into contact and joining by welding. In this way, since the outer diaphragm 13 is formed by joining the plurality of dividing members 18 and 18 having the same shape to each other, it is possible to minimize the portion of the outer diaphragm 13 to be discarded from the material, which is cost effective. Etc. can be improved in production efficiency.

As will be described in detail later, at the construction site, the tip surface of each joint portion 17 of the upper outer diaphragm 13 is in contact with the upper flange 6 on the longitudinal end surface of each beam 3, and the portion is welded. Be joined. The upper surface of each joint 17 of the upper outer diaphragm 13 and the upper surface of the upper flange 6 of each beam 3 are flush with each other. On the other hand, the tip surface of each joint portion 17 of the lower outer diaphragm 13 is brought into contact with the lower flange 6 on the longitudinal end surface of each beam 3, and the portion is joined by welding. The lower surface of each joint 17 of the lower outer diaphragm 13 and the lower surface of the lower flange 6 of each beam 3 are flush with each other.

A tubular member 19 is inserted into the openings 16 and 16 of the pair of upper and lower outer diaphragms 13 and 13 along the inner wall surface thereof. The tubular member 19 has a constant wall thickness, and its outer shape is formed in a substantially rectangular shape corresponding to the opening shape of the opening 13 of the outer diaphragm 13. The inner opening of the tubular member 19 is also formed in a substantially rectangular shape. The tubular member 19 is integrally joined in the openings 16 and 16 of the pair of upper and lower outer diaphragms 13 and 13. The length of the tubular member 19 is set to be larger than the distance between the upper surface of the upper outer diaphragm 13 and the lower surface of the lower outer diaphragm 13. As a result, the upper end of the tubular member 19 slightly protrudes upward from the upper surface of the upper outer diaphragm 13. On the other hand, the lower end of the tubular member 19 also slightly protrudes downward from the lower surface of the lower outer diaphragm 13. The amount of protrusion of the upper end of the tubular member 19 from the upper surface of the upper outer diaphragm 13 and the amount of protrusion of the lower end of the tubular member 19 from the lower surface of the lower outer diaphragm 13 are substantially the same. A reinforced concrete column 2 is arranged in the tubular member 19.

The joint portions 17 and 17 of the pair of upper and lower outer diaphragms 13 and 13 are connected by the connecting plate member 20 that is erected. In other words, the connecting plate member 20 is arranged between the joint portions 17 and 17 of the pair of upper and lower outer diaphragms 13 and 13. The connecting plate member 20 is formed in a substantially rectangular shape in a side view. The connecting plate members 20 are arranged in a pair of upper and lower joints 17 and 17 over the entire area from the outer wall surface to the outer edge of the tubular member 19 extending inside the openings 16 and 16. The connecting plate member 20 is arranged substantially in the center in the width direction (direction orthogonal to the longitudinal direction of the beam 3) of the pair of upper and lower joints 17, 17. The end face of the connecting plate member 20 on the beam 3 side is flush with the end faces of the joint portions 17, 17 of the pair of upper and lower outer diaphragms 13, 13. Further, the end surface of the connecting plate member 20 on the pillar 2 side is brought into contact with the outer wall surface of the tubular member 19 inserted into the openings 16 and 16 of the pair of upper and lower outer diaphragms 13 and 13.

Then, the upper surface of the connecting plate member 20 is joined to the lower surface of the joint portion 17 of the upper outer diaphragm 13 by welding. On the other hand, the lower surface of the connecting plate member 20 is joined to the upper surface of the joint portion 17 of the lower outer diaphragm 13 by welding. Further, the end surface of the connecting plate member 20 on the pillar 2 side is joined to the outer wall surface of the tubular member 19 by welding. After that, at the construction site, the end surface of the connecting plate material 20 on the beam 3 side is brought into contact with the web 7 on the longitudinal end surface of the beam 3, and the connecting plate material 20 and the web 7 of the beam 3 are brought into contact with each other via the connecting plate 23. It is fixed with a bolt.

As shown in FIG. 4, a cross-shaped reinforcing web 30 extending in the vertical direction is arranged in the tubular member 19 inserted into the openings 16 and 16 of the pair of upper and lower outer diaphragms 13 and 13. You may try to do it. Specifically, the four tip surfaces of the reinforcing web 30 are brought into contact with the inner wall surface of the tubular member 19 inserted into the openings 16 and 16 of the pair of upper and lower diaphragms 13 and 13, respectively, and the portions are brought into contact with each other. It is joined by welding. Thereby, the RCS joining structure 1 according to the present embodiment can be reinforced.

Next, the construction method of the RCS joining structure 1 according to the present embodiment will be described with reference to FIG.
First, in advance, a steel frame or the like manufacturing factory manufactures a pair of upper and lower outer diaphragms 13 and 13 including each connecting plate member 20 and a tubular member 19 integrally joined. Specifically, as described above, the tubular member 19 is inserted into the openings 16 and 16 of the pair of upper and lower outer diaphragms 13 and 13, and the pair of upper and lower outer diaphragms 13 and 13 and the tubular member 19 are joined by welding. .. At this time, the upper end of the tubular member 19 is slightly projected upward from the upper surface of the upper outer diaphragm 13. On the other hand, the lower end of the tubular member 19 also slightly protrudes downward from the lower surface of the lower outer diaphragm 13. Further, by joining the connecting plate members 20 to the joint portions 17 and 17 of the pair of upper and lower outer diaphragms 13 and 13 by welding, the pair of upper and lower joint portions 17 and 17 are connected by the connecting plate members 20. At this time, the end surface of the connecting plate member 20 on the pillar 2 side is joined to the outer wall surface of the tubular member 19 by welding.

Subsequently, a pair of upper and lower outer diaphragms 13 and 13 including each connecting plate member 20 and a tubular member 19 are joined to be unitized and brought to a construction site (facility). The RCS joint structure 1 according to the present embodiment can be used as a construction site (facility), for example, a distribution facility such as a distribution warehouse, a production facility such as a production factory equipped with a production line, or a commercial facility such as a department store or a shopping center. Adopted for facilities, etc.

Then, at the construction site, with reference to FIG. 5A, a plurality of main reinforcing bars 50 extending in the vertical direction are equidistant in the circumferential direction at positions close to the outer wall surface in the column 2 after the concrete is placed. A plurality of main reinforcing bars 50 are arranged at appropriate positions at the installation locations of the columns 2 so that a plurality of main reinforcing bars 50 can be installed. Subsequently, referring to FIG. 5B, the column formwork 51 is installed around the plurality of main reinforcing bars 50. At this time, each main reinforcing bar 50 is in a state of protruding upward from the upper end of the column formwork 51. Subsequently, with reference to FIG. 5C, concrete is cast in the pillar formwork 51 to construct the pillar 2, and then the pillar formwork 51 is removed. Subsequently, with reference to FIG. 5 (d), a pair of upper and lower outer diaphragms 13 and 13 including the connecting plate members 20 and a tubular member 19 are joined and unitized by assembling the pillar 2. Construction of column-beam joint construction.

That is, the lower outer diaphragm 13 is formed by joining a pair of upper and lower outer diaphragms 13 and 13 including a connecting plate member 20 and a tubular member 19 to the upper surface around each main reinforcing bar 50 in the column 2. Place so that they are in contact with each other. Then, a plurality of main reinforcing bars 50 projecting from the upper surface of the column 2 are close to the inner wall surface of the tubular member 19 inserted into the openings 16 and 16 of the pair of upper and lower outer diaphragms 13, 13 and in the circumferential direction thereof. They are arranged at substantially the same intervals along the above, and are in a state of protruding upward from the upper end of the tubular member 19. If an embodiment (see FIG. 4) in which the reinforcing webs 30 having a cross shape in a plan view extending in the vertical direction are arranged in the tubular member 19, the reinforcing webs 30 are placed on the upper surface of the column 2. Increases its stability.

Subsequently, as shown in FIG. 5 (e), a beam 3 made of four H steels is attached to a unit formed by joining a pair of upper and lower outer diaphragms 13, 13 and a tubular member 19. Install the steel frame construction to be assembled. That is, the longitudinal end portions of the web 7 of each beam 3 are bolted to the connecting plate material 20 between the pair of upper and lower diaphragms 13 and 13 via the connecting plate 23. Further, the tip surfaces of the joint portions 17 and 17 of the pair of upper and lower outer diaphragms 13 and 13 and the end faces of the pair of upper and lower flanges 6 of each beam 3 in the longitudinal direction are joined by welding. As a result, the construction of the RCS joining structure 1 according to the present embodiment is completed.

Subsequently, with reference to FIG. 5 (f), a plurality of (4 sheets in the figure) floor slabs (4 sheets in the figure) are placed on the upper flanges 6 and 6 of the beams 3 and 3 so as to be hung on the beams 3 and 3. Formwork) 53, 53 are laid so as to leave a slight gap between them. Subsequently, with reference to FIG. 5 (g), concrete (similar to the concrete on which the pillar 2 shown in FIG. 5 (c) is constructed) is inserted into the openings 16 and 16 of the pair of upper and lower outer diaphragms 13 and 13. In the tubular member 19, the floor plate 53 is placed from the upper surface to a position slightly above (reference numeral 54A in the figure indicates a concrete layer). Subsequently, with reference to FIG. 5 (h), in the tubular member 19 around the tubular member 19, between adjacent floor slabs 53 (on the upper flange 6 of each beam 3), and on each floor slab 53. Concrete is poured until it is substantially flush with the upper surface of the concrete layer 54A placed in (reference numeral 54B in the figure indicates a concrete layer). The concrete strength (concrete layer 54A) placed in the tubular member 19 is different from the concrete strength (concrete layer 54B) placed on each deck 53.

At this time, the plurality of main reinforcing bars 50 in the column 2 are in a state of projecting upward from the floor surface (upper surface of the concrete layer 54), and the plurality of main reinforcing bars 50 in the column 2 are up and down. They are arranged close to the inner wall surface of the tubular member 19 inserted into the openings 16 and 16 of the pair of outer diaphragms 13 and 13 at substantially the same interval along the circumferential direction. In the present embodiment, concrete is cast in the column formwork 51 to construct the column 2 (RC structure) at the construction site, but at the manufacturing plant, a plurality of main reinforcing bars 50 are constructed in advance. A pillar 2 formed by casting concrete containing the above (PCa structure) may be manufactured and brought to the construction site. In some cases, a pillar 2 formed by casting concrete containing a plurality of main reinforcing bars 50 is manufactured in advance at a construction site and placed at an installation location (PCa structure). As a matter of course, even when the column 2 is manufactured in advance at a manufacturing factory or a construction site, a plurality of main reinforcing bars 50 extending in the vertical direction are arranged in the column 2 in the circumferential direction at a position close to the outer wall surface thereof. Arranged along approximately the same spacing.

In the RCS joining structure 1 according to the present embodiment described above, the pillars 2 are arranged in the tubular members 19 inserted into the openings 16 and 16 of the pair of upper and lower outer diaphragms 13 and 13, and the pillars 2 are arranged vertically in the pillars 2. A plurality of main reinforcing bars 50 extending in the direction can be arranged in close proximity to the inner wall surface in the tubular member 19 at substantially the same intervals along the circumferential direction without accommodating the reinforcing bars. As a result, the expansion of the cross section of the pillar 2 can be suppressed. Further, the RCS joining structure 1 according to the present embodiment includes a tubular member 19 inserted into the openings 16 and 16 of the pair of upper and lower outer diaphragms 13 and 13, and the tubular member 19 is provided with the pair of upper and lower outer diaphragms 13. , 13 are projected in the vertical direction, respectively. As a result, the loads from the outer diaphragms 13 and 13 are transmitted to the outer wall surface of the reinforced concrete column 2 via the entire wall portion of the tubular member 19, so that each outer wall surface of the column 2 is transmitted to the outer wall surface. The load from the diaphragms 13 and 13 can be distributed, and it is possible to suppress the occurrence of crushing on a part of the outer wall surface of the pillar 2.

Further, since the RCS joint structure 1 according to the present embodiment has a connecting plate member 20 for connecting the joint portions 17 and 17 of the pair of upper and lower outer diaphragms 13 and 13, respectively, the pair of upper and lower outer diaphragms 13 and 13 and the beam 3 It becomes easy to join with the longitudinal end of the. Further, in the RCS joining structure 1 according to the present embodiment, the connecting plate member 20 is bolted to the web 7 of the beam 3 via the connecting plate 23, so that the pair of upper and lower outer diaphragms 13 and 13 and the beam 3 are longitudinally fixed. Joining with the end is even easier.

1 RCS joint structure, 2 columns, 3 beams, 6 flanges, 7 webs, 13 outer diaphragms, 16 openings, 17 joints, 18 split members, 19 tubular members, 20 connecting plates, 23 connecting plates, 50 main reinforcing bars

Claims (5)

It is an RCS joint structure in which multiple steel beams are joined to a reinforced concrete column.
An outer diaphragm having an opening and each joint extending radially from the opening and joined to each of the beams, and a pair of outer diaphragms provided at intervals along the vertical direction.
A tubular tubular member that is inserted along the inner wall surface of the opening of the pair of upper and lower outer diaphragms and in which the pillar is arranged is provided.
The tubular member is an RCS joint structure characterized in that it is formed so as to project from the pair of upper and lower outer diaphragms in the vertical direction. The tubular member is characterized in that a plurality of main reinforcing bars extending in the vertical direction in the column are arranged close to the inner wall surface of the tubular member at substantially the same interval in the circumferential direction. The RCS joining structure according to claim 1. The RCS joining structure according to claim 1 or 2, wherein the outer diaphragm is formed by joining a plurality of dividing members having the same shape to each other. The RCS joining structure according to any one of claims 1 to 3, further comprising a connecting plate material for connecting the joining portions of the pair of upper and lower outer diaphragms. The beam is made of H steel and is made of H steel.
The connecting plate material is bolted to the web of the beam via the connecting plate.
The RCS joining structure according to claim 4, wherein the joining portion is welded to the flange of the beam.

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