JP2021161817A - Junction structure and junction method - Google Patents

Abstract

To provide a junction structure or the like capable of integrating a frame and a wall body in a frame structure plane easily.SOLUTION: The junction structure connects a frame having a column in a steel construction and a beam 20a, and an earthquake resistance wall 30 in steel bar concrete enclosed by the frame, a perforated steel plate dowel 21 is provided at the column in the steel construction and the beam 20a, the perforated steel plate dowel 21 is buried in the earthquake resistance wall 30, and a vertical reinforcement 31 or a horizontal reinforcement of the earthquake resistance wall 30 is inserted through a hole 211 of the perforated steel plate dowel 21. The perforated steel plate dowel 21 has a cross section in T-shape consisting of a leg part 21a and a flange part 21b, and the vertical reinforcement 31 or the horizontal reinforcement of the earthquake resistance wall is inserted through the hole 211 provided in the flange part 21b.SELECTED DRAWING: Figure 2

Description

The present invention relates to a joining structure and a joining method for joining a frame and a wall body in a frame structure.

Reinforced concrete (RC) shear walls are often provided in the structure of frames with steel (S) columns and beams, and as a joint structure between the frame and the shear walls, steel beams are used. Some of the provided headed studs are embedded in the earthquake-resistant wall (see Patent Document 1).

In addition, a structure in which the steel frames of columns and beams are wrapped with reinforced concrete and the concrete is connected to the earthquake-resistant wall is also generally used in the structural design of new construction.

Further, Patent Document 2 discloses a structure in which a bearing piece and an anchor reinforcing bar are welded to a steel beam and the bearing piece and the anchor reinforcing bar are embedded in a seismic wall.

Patent No. 3648094 Patent No. 5789173

When joining a frame and a shear wall with a headed stud, the shear strength per stud is small and the rigidity of the joint is weak, so there is a problem in terms of the integrity of the frame and the shear wall. In addition, according to various synthetic structure design guidelines, it is necessary to separately bury the spiral reinforcement in the shear wall in order to integrate the headed stud and the wall reinforcement of the shear wall.

When reinforced concrete is wrapped around the steel frames of columns and beams and this concrete is connected to the earthquake-resistant wall, there is a problem that the construction time is large because the columns and beams are made of steel-framed reinforced concrete (SRC structure). In addition, the cross section of columns and beams becomes large, which leads to a decrease in the usable area of the building. In Patent Document 2, in addition to the bearing piece, the anchor reinforcing bar is welded to the beam, which requires extra construction work.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a joint structure or the like in which a frame and a wall body in a frame structure can be easily integrated.

The first invention for solving the above-mentioned problems is a joint structure of a frame having at least steel columns or beams and a reinforced concrete wall surrounded by the frames, and is a steel columns or beams. A perforated steel plate gibber is provided in at least one of the beams, and the perforated steel plate gibber is embedded in the wall. It is a joint structure characterized in that a reinforcing bar fixed to any of the above is passed through.

In the present invention, a perforated steel plate gibber is attached to a steel beam or column constituting the frame, and the perforated steel plate gibber is embedded in the wall body in the frame structure to attach the frame and the wall body to a perforated steel plate gibber having a large shear strength. Can be integrated by. Moreover, by passing the wall reinforcements (vertical and horizontal reinforcements) in the wall or the reinforcing bars fixed to them through the holes of the perforated steel plate gibber, the shearing of the perforated steel plate gibber can be reasonably performed by utilizing the reinforcement arrangement of the wall body. The proof stress can be increased, and a larger force can be transmitted to improve the unity between the frame and the wall body. Further, in the present invention, the spiral bar and the anchor reinforcing bar described above are not required, and the steel frame of the beam or column does not need to be wrapped with reinforced concrete. Therefore, the effective opening area of the frame is not reduced, and therefore the usable area of the building is reduced. There is no. In addition, the construction work can be reduced accordingly.

The perforated steel plate gibber has, for example, a T-shaped cross section including a leg portion and a flange portion, and vertical or horizontal streaks of the wall body are passed through the holes provided in the flange portion.
In this case, the vertical and horizontal bars can be passed directly through the hole, and the workability is improved.

Alternatively, the perforated steel plate gibber has a flat plate shape, and a folded portion of a U-shaped reinforcing bar fixed to either a vertical bar or a horizontal bar of the wall body is passed through the hole.
In this case, the adhesion between the U-shaped streak and the concrete of the wall body can suppress the opening between the gibber and the concrete, and improve the shear strength of the perforated steel plate gibber.

The second invention is a method of joining a frame having at least a steel-framed column or beam and a reinforced concrete wall surrounded by the frame, and is provided on at least one of the steel-framed columns or beams. It is characterized in that the perforated steel plate gibber is embedded in the wall by passing a reinforcing bar fixed to either the vertical or horizontal streaks of the wall body or either the vertical streaks and the horizontal streaks through the holes of the perforated steel plate gibber. It is a joining method.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a joint structure or the like in which a frame and a wall body in a frame structure can be easily integrated.

The figure which shows the joining structure 1 of 1st Embodiment. The figure which shows the perforated steel plate gibber 21. The figure which shows the joining structure 1a of the 2nd Embodiment. The figure which shows the perforated steel plate gibber 22. The figure explaining the variation of the 2nd Embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram showing a joining structure 1 according to the first embodiment of the present invention. The joining structure 1 joins the frame 20 and the earthquake-resistant wall 30 in the frame structure.

The frame 20 has a steel beam 20a and a steel column 20b. The beam 20a is, for example, a steel beam made of H-shaped steel, and the column 20b is, for example, a concrete-filled steel tube column or a steel frame column, but the beam 20a is not limited thereto.

The earthquake-resistant wall 30 is a reinforced concrete wall body surrounded by the frame 20. Inside the earthquake-resistant wall 30, vertical bars 31 and horizontal bars 32 are embedded as wall bars. The vertical bars 31 are vertical reinforcing bars, and a plurality of vertical bars 31 are arranged at intervals in the horizontal direction. The horizontal bars 32 are reinforcing bars in the horizontal direction, and a plurality of horizontal bars 32 are arranged at intervals in the vertical direction. In FIG. 1, the intermediate portion between the vertical streaks 31 and the horizontal streaks 32 is omitted except for a part.

In the joint structure 1, a perforated steel plate gibber 21 is installed on the surface of the beam 20a and the column 20b on the seismic wall 30 side, and the perforated steel plate gibber 21 is embedded inside the seismic wall 30. The perforated steel plate gibber 21 is a reinforcing material that integrates the frame 20 and the seismic wall 30 by the shear resistance of the concrete filled in the holes. The perforated steel plate gibber 21 transmits the shearing force to the seismic wall 30. Stress can be passed through the frame 20.

Further, in the present embodiment, not only the perforated steel plate gibber 21 is embedded in the seismic wall 30, but also the vertical bar 31 and the horizontal bar 32 are passed through the hole to increase the shear strength per hole.

2 (a) and 2 (b) are views showing a cross section in the vicinity of the perforated steel plate gibber 21. FIG. 2A shows a perforated steel plate gibber 21 attached to the beam 20a above the earthquake-resistant wall 30, and FIG. 2B shows a perforated steel plate gibber 21 attached to the beam 20a below the earthquake-resistant wall 30. 21 is shown. 2 (a) and 2 (b) are cross-sections of the beam 20a orthogonal to the axial direction.

The perforated steel plate gibber 21 of the present embodiment has a T-shaped cross section including a leg portion 21a and a flange portion 21b. For example, cut T-shaped steel is used for the perforated steel plate gibber 21, and the leg portion 21a is attached to the beam 20a by fillet welding (not shown), and the plate surface of the leg portion 21a is in the axial direction of the beam 20a (FIG. 2 (FIG. 2). Arrange so as to follow a) and (b) corresponding to the paper normal direction).

A hole 211 is provided in the flange portion 21b of the perforated steel plate gibber 21, and a vertical streak 31 is passed through the hole 211. The upper end of the vertical bar 31 is arranged at a distance from the lower flange of the beam 20a as shown in FIG. 2 (a), but the lower end of the vertical bar 31 is shown in FIG. 2 (b). It is placed on the upper flange of the beam 20a so as to be placed.

As shown in FIG. 2C, a plurality of holes 211 are arranged at intervals in the longitudinal direction of the perforated steel plate gibber 21 (corresponding to the axial direction of the beam 20a), and in the example of the figure, vertical streaks are formed in each hole 211. 31 is passed. In the present embodiment, the shear strength per hole of the perforated steel plate gibber 21 is increased only by passing the vertical bar 31 through the hole 211, and the construction is easy.

In the present embodiment, the same perforated steel plate gibber 21 is attached to the pillar 20b, and both ends of the horizontal streaks 32 are passed through the holes 211 of the perforated steel plate gibber 21 as in the example of FIG. 2A. ..

The arrangement of the perforated steel plate gibber 21 in the beam 20a and the column 20b can be arbitrarily set, and a large number of shorter perforated steel plate gibber 21 can be arranged side by side in the axial direction of the beam 20a and the column 20b.

For the length and cross-sectional shape of the perforated steel plate gibber 21, after determining the shear force that the seismic wall 30 can bear or the shear force that the seismic wall 30 wants to bear, the beam 20a ( Alternatively, the shear force to be transferred between the column 20b) and the seismic wall 30 can be calculated, the number of holes 211 required to resist the shear force can be obtained, and the number can be determined accordingly. Further, the shear stress at the welding position of the leg portion 21a of the perforated steel plate gibber 21 is also taken into consideration, and the shear stress is set so as to be equal to or less than the allowable proof stress.

Regarding the setting of the diameter and pitch of the holes 211 with respect to the dimensions of each part of the perforated steel plate gibber 21, basically, the allowable proof stress (shearing proof stress) at the welding position of the leg portion 21a of the perforated steel plate gibber 21 is determined. It is determined so that the allowable yield strength of the concrete in the hole 211 is reduced.

The diameter of the hole 211 is, for example, about 40 mm to 80 mm, although it depends on the wall thickness of the earthquake-resistant wall 30, and is large enough for the rough concrete aggregate of the earthquake-resistant wall 30 to pass through. Normally, the diameter of the vertical bar 31 and the horizontal bar 32 is about 10 mm to 22 mm, so if the size is set so that the coarse aggregate can pass through, the vertical bar 31 and the horizontal bar 32 can also be inserted without any problem.

The joint structure 1 of the present embodiment can be applied to both a new construction in which the frame 20 and the earthquake-resistant wall 30 are constructed at the same time, and a reinforcement work in which the earthquake-resistant wall 30 is later constructed in the structure of the existing frame 20. It is possible. In either case, after passing the vertical and horizontal bars 32 through the holes 211 of the perforated steel plate gibber 21 provided in the steel beam 20a and the column 20b, the perforated steel plate gibber 21 is buried in the concrete of the earthquake-resistant wall 30. Just do it. In the case of new construction, the perforated steel plate gibber 21 is welded to the beams 20a and columns 20b in advance at the factory, which leads to a reduction in on-site construction (on-site welding) labor. However, it is also possible to perform on-site welding of the perforated steel plate gibber 21 after the beam 20a and the column 20b are constructed.

As described above, according to the present embodiment, the frame 20 and the frame are formed by attaching the perforated steel plate gibber 21 to the steel beam 20a and the column 20b constituting the frame 20 and burying the perforated steel plate gibber 21 in the earthquake-resistant wall 30. The seismic wall 30 in the structure can be integrated with the perforated steel plate gibber 21 having a large shear strength. Moreover, by passing the wall bars (vertical bars 31 and horizontal bars 32) in the earthquake-resistant wall 30 through the holes 211 of the perforated steel plate gibber 21, the reinforcing bars of the seismic wall 30 can be used to reasonably use the perforated steel plate gibber 21. The shear strength can be increased, a larger force can be transmitted, and the integrity of the frame 20 and the shear wall 30 is improved.

Further, in the present embodiment, the spiral bar and the anchor reinforcing bar described above are not required, and the steel frame of the beam 20a and the column 20b does not need to be wrapped with reinforced concrete. Therefore, the effective opening area of the frame 20 is not reduced, and therefore the usable area of the building is not reduced. Does not decrease. In addition, the construction work can be reduced accordingly.

Further, in the present embodiment, the wall reinforcement can be directly passed through the hole 211 of the perforated steel plate gibber 21, and the workability is improved. Further, the T-shaped perforated steel plate gibber 21 is highly integrated with the seismic wall 30, and by extension, the frame 20 to which the perforated steel plate gibber 21 is attached and the seismic wall 30 are more integrated with the frame 20 and the seismic wall 30. The opening between the walls 30 is suppressed.

However, the present invention is not limited to the above embodiments. For example, in the present embodiment, the ends of the wall bars are passed through all the holes 211 of the perforated steel plate gibber 21, but it is not essential to pass the ends of the wall bars through all the holes 211. However, since the end of the wall reinforcement can be brought into a state close to fixing by passing the end of the wall reinforcement through the hole 211, it is desirable in terms of construction of the wall reinforcement if the wall reinforcement can be passed through all the holes 211. The high shear strength per hole of the perforated steel plate gibber 21 also leads to a reduction in the number of holes.

Further, in consideration of the stability of the reinforcement arrangement, the ends of the plurality of vertical bars 31 protruding toward the beam 20a from each of the plurality of holes 211 of the perforated steel plate gibber 21 attached to the beam 20a are shown in the horizontal direction (not shown). It is also desirable to bind to the setup muscles. Similarly, it is also desirable to bind the ends of the plurality of horizontal bars 32 protruding toward the column 20b from each of the plurality of holes 211 of the perforated steel plate gibber 21 attached to the column 20b to a setup bar in the vertical direction (not shown). It is also conceivable to bend the ends of the plurality of vertical bars 31 and horizontal bars 32 in a hook shape to further enhance the fixing force.

Further, the leg portion 21a of the perforated steel plate gibber 21 may be provided with a hole (not shown) through which the vertical streaks 31 and the horizontal streaks 32 cannot pass, and the perforated steel plate gibber is filled with concrete of the earthquake-resistant wall 30. The shear strength of 21 is improved.

Further, in the present embodiment, the perforated steel plate gibber 21 is provided on both the steel beam 20a and the column 20b, but the perforated steel plate gibber 21 may be provided on only one of them. Further, the column 20b may be made of a reinforced concrete structure or a steel-framed reinforced concrete structure (SRC structure). In this case, a perforated steel plate gibber 21 may be provided on the steel-framed beam 20a. Further, the beam 20a below the shear wall 30 may be a reinforced concrete foundation beam or the like, and in this case, a hole is made in at least one of the steel column 20b or the steel beam 20a above the shear wall 30. The open steel plate gibber 21 may be provided.

Hereinafter, another example of the present invention will be described as a second embodiment. The second embodiment describes a configuration different from that of the first embodiment, and the same configurations will be omitted by adding the same reference numerals in figures and the like.

[Second Embodiment]
FIG. 3 is a diagram showing a joint structure 1a according to a second embodiment of the present invention. In the joining structure 1a of the present embodiment, a flat plate-shaped perforated steel plate gibber 22 is used instead of the T-shaped perforated steel plate gibber 21.

4 (a) and 4 (b) are views showing a cross section of the vicinity of the perforated steel plate gibber 22 in the same manner as in FIGS. 2 (a) and 2 (b). As described above, the perforated steel plate gibber 22 of the present embodiment has a flat plate shape, and a steel plate or the like is used. The side side of the perforated steel plate gibber 22 is attached to the beam 20a by fillet welding (not shown), and the plate surface corresponds to the axial direction of the beam 20a (corresponding to the paper surface normal direction in FIGS. 4A and 4B). It is arranged along the line.

The folded portion of the U-shaped streak 33 is passed through the hole 221 of the perforated steel plate gibber 22. The U-shaped bar 33 is a U-shaped reinforcing bar, and both ends thereof are bound and fixed to the vertical bar 31 by a binding material (not shown). Also in this embodiment, the upper end portion of the vertical bar 31 is arranged with a gap from the lower flange of the beam 20a, and the lower end portion is arranged on the upper flange of the beam 20a.

As shown in FIG. 4C, a plurality of holes 221 are arranged at intervals in the longitudinal direction of the perforated steel plate gibber 22 (corresponding to the axial direction of the beam 20a), and in the example of the figure, each hole has a U shape. The muscle 33 is passed through.

Further, a similar perforated steel plate gibber 22 is attached to the pillar 20b, and the folded portion of the U-shaped streak 33 fixed to both ends of the horizontal streak 32 is a perforated steel plate gibber as in the example of FIG. 4A. It is passed through the hole 221 of 22.

The arrangement of the perforated steel plate gibber 22 on the beam 20a and the pillar 20b, the length and cross-sectional shape of the perforated steel plate gibber 22, and the diameter and pitch of the holes 221 can be set substantially in the same manner as in the first embodiment.

Also in this embodiment, the perforated steel plate gibber 22 is attached to the steel beam 20a or the column 20b, the perforated steel plate gibber 22 is embedded in the earthquake-resistant wall 30, and the U-shaped streak 33 is formed in the hole 211 of the perforated steel plate gibber 22. By passing through the folded portion, the same effect as that of the first embodiment can be obtained.

Further, in the perforated steel plate gibber 22, the shear strength of the perforated steel plate gibber 22 is suppressed by suppressing the opening (splitting) between the gibber and the concrete in the direction orthogonal to the hole 221 indicated by the arrow a in FIG. 4 (a). However, in the second embodiment, the effect of preventing the opening is produced by the adhesion between the U-shaped streak 33 and the concrete of the earthquake-resistant wall 30. On the other hand, in the first embodiment, as shown by the arrow a in FIG. 2A, the direction orthogonal to the hole 211 of the perforated steel plate gibber 21 is the in-plane direction of the seismic wall 30, so that the gibber in that direction. It can be expected that opening (splitting) with concrete is less likely to occur.

Further, in the second embodiment, the U-shaped streak 33 can be expected to have an effect of suppressing the opening between the frame 20 and the earthquake-resistant wall 30. Further, by fixing the U-shaped streak 33 to the vertical streak 31 and the horizontal streak 32, the integrity as a structure is also improved.

In the second embodiment, as shown in FIGS. 4 (a) and 4 (b), the perforated steel plate gibber 22 corresponds to the direction orthogonal to the earthquake-resistant wall 30 (corresponding to the left-right direction of FIGS. 4 (a) and 4 (b)). ), But depending on the cross section of the beam 20a or the column 20b, it is possible to provide a plurality of perforated steel plate gibber 22 in the direction orthogonal to the earthquake-resistant wall 30, and these plurality of perforated steel plate gibber 22. It is also possible to penetrate the folded portion of the U-shaped streak 33 through the hole 221 of.

Further, in the present embodiment, the U-shaped streaks 33 are passed through all the holes 221 of the perforated steel plate gibber 22, but it is also possible to separately provide holes in the perforated steel plate gibber 22 through which the U-shaped streaks 33 are not passed. By filling the holes with concrete of the earthquake-resistant wall 30, the shear strength of the perforated steel plate gibber 22 is improved.

Further, in the second embodiment, both ends of the U-shaped streaks 33 passed through the holes 221 of the perforated steel plate gibber 22 attached to the beam 20a are fixed to the vertical streaks 31. ), Both ends of the U-shaped streak 33 may be fixed to the horizontal streak 32. In this case, the U-shaped streaks 33 can be arranged without being affected by the pitch of the vertical streaks 31. Similarly, with respect to the U-shaped streaks 33 passed through the holes 221 of the perforated steel plate gibber 22 attached to the pillar 20b, both ends thereof can be fixed to the vertical streaks 31 instead of the horizontal streaks 32.

Further, as illustrated in FIG. 5B, the end portion of the vertical bar 31 may be bent into a hook shape, and the bent portion may be passed through the hole 221 of the perforated steel plate gibber 22 attached to the beam 20a. Similarly, a bent portion in which the end portion of the horizontal bar 32 is bent into a hook shape can be passed through the hole 221 of the perforated steel plate gibber 22 attached to the pillar 20b. It is also possible to fix hook-shaped reinforcing bars to the ends of the vertical bars 31 and the horizontal bars 32 and pass the bent portions through the holes 221 of the perforated steel plate gibber 22.

Further, as shown in FIG. 5 (c), a hole 212 is provided in the leg portion 21a of the T-shaped perforated steel plate gibber 21 (see the first embodiment) attached to the beam 20a, and the hole 212 is provided with a hole 212. The folded portion of the character line 33 may be inserted. In the example of FIG. 5C, the vertical streaks 31 are not passed through the holes 211 of the flange portion 21b, but the vertical streaks 31 may be passed through the holes 211, and both ends of the U-shaped streaks 33 are fixed to the vertical streaks 31. It is also possible to do. Further, the end portion of the vertical bar 31 passed through the hole 211 can be bent into a hook shape, and the bent portion can be passed through the hole 212. The same applies to the perforated steel plate gibber 21 attached to the pillar 20b.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1, 1a: Joint structure 20: Frame 20a: Beam 20b: Column 21, 22: Perforated steel plate gibber 21a: Leg 21b: Flange 30: Shear wall 31: Vertical bar 32: Horizontal bar 33: U-shaped bar 211, 212, 221: Hole

Claims (4)

A joint structure of a frame having at least steel columns or beams and a reinforced concrete wall surrounded by the frame.
Perforated steel plate gibber is provided on at least one of the steel columns or beams.
The perforated steel plate gibber is embedded in the wall,
A joint structure characterized in that a reinforcing bar fixed to either a vertical bar or a horizontal bar, or a vertical bar and a horizontal bar of the wall body is passed through a hole of the perforated steel plate gibber. The perforated steel plate gibber has a T-shaped cross section including a leg portion and a flange portion, and has a T-shaped cross section.
The joint structure according to claim 1, wherein vertical or horizontal streaks of the wall body are passed through the holes provided in the flange portion. The perforated steel plate gibber has a flat plate shape and has a flat plate shape.
The joint structure according to claim 1, wherein a folded portion of a U-shaped reinforcing bar fixed to either a vertical bar or a horizontal bar of the wall body is passed through the hole. A method of joining a frame having at least steel columns or beams to a reinforced concrete wall surrounded by the frame.
Through the holes of the perforated steel plate gibber provided in at least one of the steel columns or beams, a reinforcing bar fixed to either the vertical or horizontal bar of the wall body or the vertical bar and the horizontal bar is passed through the hole.
A joining method comprising embedding the perforated steel plate gibber in the wall.

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