JP6651827B2 - Existing steel frame reinforcement structure - Google Patents

Description

  The present invention relates to an existing steel frame reinforcing structure.

2. Description of the Related Art Conventionally, in reinforcing a steel frame provided in a building of an ironworks, for example, a steel material such as an iron plate having high heat resistance is generally joined to a reinforcing portion by welding.
However, in the steel factory building as described above, gas pipes, electrical wiring, or flammable materials are provided around the reinforcement target (existing steel frame), and it is necessary to take strict fire curing and strict safety measures. Use of fire is restricted.
Therefore, as a reinforcing structure of an existing steel frame without using welding, for example, as shown in Patent Document 1, a resin carbon fiber sheet having rigidity is bonded to a portion of a deformation generating portion to be reinforced where a tensile force acts. A known structure is known.

JP 2013-47446 A

Existing steel frames generally have columns and beams. A gusset plate (connection member) is provided at a portion where the column and the beam are fixed. The brace is connected to the gusset plate by fastening members such as bolts and rivets.
Existing steel frames that have been used for a long period of time have low strength at the connection between the gusset plate and the brace (including the fastening member and the gusset plate near the fastening member) due to aging, design standards, and the like. For this reason, reinforcement of the connection portion is being studied.

However, the conventional existing steel frame reinforcement structure has the following problems.
That is, in the case of a method of bonding a carbon fiber sheet to a connecting portion as a reinforcing material as described in Patent Document 1, since the carbon fiber sheet made of resin has a deformability, it has moldability, but has heat resistance. Is low. When used in an operating environment such as the above-mentioned steel mill, which is exposed to high heat, the reinforcing structure of Patent Document 1 cannot exhibit sufficient functions and has low durability. There was room for

  The present invention has been made in view of the above-described problems, and does not require the use of fire such as welding, and the use of an existing steel frame that reinforces a connection portion between a connection member and a brace of the existing steel frame with heat resistance. It is intended to provide a reinforcing structure.

In order to solve the above problems, the present invention proposes the following means.
The reinforcing structure for an existing steel frame according to the present invention is an existing steel frame for reinforcing a connecting member provided at a portion where a column and a beam are fixed in an existing steel frame and a brace member having an end connected to the connecting member. A reinforcing structure for a steel frame, wherein a first reinforcing member formed of a steel material, a first shaft-shaped member that is one of the columns and the beams, and the first reinforcing member are connected by friction joining or engagement joining. a first connecting portion that, the said first reinforcing member and the brace member, Bei example and the second connection portion are connected by friction bonding or engagement bonding, wherein the first reinforcing member is a flat plate A reinforcing plate main body, a first end plate provided at a first end of the reinforcing plate main body, and a second end plate provided at a second end of the reinforcing plate main body. The first connecting portion connects the first shaft-shaped member and the first end plate by friction joining or engagement joining. And the second connecting portion, and said second end plate and the brace member, and wherein the connecting by friction bonding or engagement joint.

  According to the present invention, the first reinforcing member is disposed so as to straddle the connection portion, and the first shaft-shaped member and the first reinforcing member, and the brace material and the first reinforcing member are connected by friction joining or engagement joining. I have. Friction and engagement joints are joints that do not use welding. Since the reinforcing member is formed of a steel material, it has heat resistance. The external force acting on the first shaft-shaped member or the brace material is also transmitted to the first reinforcing member, the first connection portion, and the second connection portion, and the external force can be dispersed. Therefore, the external force borne by the connecting portion can be reduced, and the connecting portion can be reinforced.

In the above-described reinforcing structure for an existing steel frame, a second reinforcing member formed of a steel material and disposed on a side opposite to the first reinforcing member with respect to the brace, and a second reinforcing member that is the other of the column and the beam. A third connecting portion connecting the biaxial member and the second reinforcing member by friction joining or engaging joining, and connecting the brace and the second reinforcing member by friction joining or engaging joining. And a fourth connection portion.
According to this invention, the first reinforcing member and the second reinforcing member are arranged so as to sandwich the connecting portion, and the second shaft-like member and the second reinforcing member, and the brace material and the second reinforcing member are friction-bonded or They are connected by engaging joints. By reinforcing the connecting portion from both sides with the first reinforcing member and the second reinforcing member, the connecting portion can be more reliably reinforced.

Further, another existing steel frame reinforcing structure of the present invention includes a connecting member provided at a portion of the existing steel frame to which a column and a beam are fixed, and a brace member having an end connected to the connecting member. An existing steel frame reinforcing structure for reinforcing a first reinforcing member formed of a steel material, a first shaft-shaped member that is one of the column and the beam, and the first reinforcing member, A first connecting portion connected by joining, a second connecting portion connecting the brace material and the first reinforcing member by friction bonding or engagement bonding, and the brace material formed of steel; The second reinforcing member disposed on the side opposite to the first reinforcing member with respect to the second shaft-like member and the second reinforcing member, which is the other of the column and the beam, is friction-bonded or engaged. A third connecting portion connected by joining, the brace material and the second reinforcement A wood, a fourth connection portion that is connected by friction bonding or engagement joint, wherein the fourth connection part is characterized by being formed integrally with the second connecting portion.

In the above-described reinforcing structure for an existing steel frame, the first shaft-shaped member and the first reinforcing member are arranged side by side so as to be in contact with each other in a first direction. The first shaft-shaped member and the first reinforcing member may be connected by friction welding by pressing the shaped member and the first reinforcing member from the outside in the first direction.
According to this invention, the first shaft member and the first reinforcing member are pressed by the first connection portion, so that the first shaft member and the first shaft member are located between the first connection portion and the first shaft member. A static friction force is acting between one of the reinforcing members and between the first reinforcing member and the first connecting portion. For this reason, the first shaft-shaped member and the first reinforcing member can be connected without using welding.

Further, in the above-described reinforcing structure for an existing steel frame, the brace member and the first reinforcing member are arranged side by side so as to be in contact with each other in a second direction, and the second connecting portion includes the brace member and the first member. The brace material and the first reinforcing member may be connected by friction welding by pressing the reinforcing member from the outside in the second direction.
According to this invention, by pressing the brace material and the first reinforcement member by the second connection portion, between the second connection portion and the brace material, between the brace material and the first reinforcement member, and A static friction force acts between the first reinforcing member and the second connection part. Therefore, the brace material and the first reinforcing member can be connected without using welding.

Further, in the above-described reinforcing structure for an existing steel frame, the first connecting portion includes a first shaft-shaped hole formed in the first shaft-shaped member, and a reinforcing main hole formed in the first reinforcing member. Is arranged in the first shaft-shaped hole portion and connected to the first shaft-shaped member by engagement joint, and is arranged in the reinforcing main hole portion and connected to the first reinforcement member by engagement joint. And a first engaging member that is in contact therewith.
According to the present invention, the first shaft-shaped member and the first engagement member, and the first engagement member and the first reinforcing member are engaged and joined. Therefore, the first shaft-shaped member and the first reinforcing member can be connected via the first engagement member without using welding.

In the above-described reinforcing structure for an existing steel frame, the second connection portion includes a brace hole formed in the brace material, a reinforcement sub-hole formed in the first reinforcement member, and a brace hole formed in the brace hole. A second engaging member arranged and connected to the brace material by an engagement joint, and arranged in the reinforcing sub-hole and connected to the first reinforcement member by an engagement joint. Is also good.
According to the present invention, the brace member and the second engaging member, and the second engaging member and the first reinforcing member are engaged and joined. For this reason, the brace material and the first reinforcing member can be connected via the second engaging member without using welding.

  ADVANTAGE OF THE INVENTION According to the reinforcement structure of the existing steel frame of this invention, while having heat resistance, the connection part of the connection member and brace material in an existing steel frame can be reinforced without using welding.

It is a perspective view of a building in which the reinforcement structure of the existing steel frame of a 1st embodiment of the present invention is used. It is a perspective view of the 1st reinforcement member of the same existing steel frame reinforcement structure. It is a perspective view of the 2nd reinforcement member of the same steel frame reinforcement structure. It is sectional drawing of the side surface in the state where the 2nd connection part of the reinforcement structure of the existing steel frame was connected to the brace material. It is sectional drawing of the side of the brace material of the existing steel frame of the comparative example. It is a figure showing the result of having simulated the existing steel frame brace material of an example and a comparative example. It is a perspective view of the building where the reinforcement structure of the existing steel frame of a 2nd embodiment of the present invention is used. It is sectional drawing of the 1st connection part of the same existing steel frame reinforcement structure. It is sectional drawing explaining the example which forms a 1st axial hole in a pillar with a water jet device. It is sectional drawing of the 1st connection part of the reinforcement structure of the existing steel frame in the modification of 2nd Embodiment of this invention.

(1st Embodiment)
Hereinafter, a first embodiment of a reinforcing structure for an existing steel frame according to the present invention (hereinafter, also simply referred to as a reinforcing structure) will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, for example, in a building 50 of a steel plant, a steel frame having a column (first shaft member) 56, a beam (second shaft member) 57, and a brace member 58 (hereinafter, an existing steel frame 55) is provided. Is called). A gusset plate (connection member) 59 is provided at a portion of the existing steel frame 55 where the column 56 and the beam 57 are fixed.
For example, an H-section steel is used for the column 56 and the beam 57, and an angle iron is used for the brace member 58. The gusset plate 59 is formed of a steel plate or the like.
The column 56, the beam 57, and the gusset plate 59 are connected to each other by welding or the like. The gusset plate 59 and one end 58a of the brace member 58 are connected by a fastening member 60 such as a bolt or a rivet. More specifically, the brace member 58 is formed by forming a first plate member 58b and a second plate member 58c in a mountain shape. The first plate member 58 b of the brace member 58 is connected to the gusset plate 59 by the fastening member 60.

The reinforcing structure 1 of the present embodiment reinforces the connection portion 62 between the gusset plate 59 and the brace member 58. Here, the connection portion 62 means a portion of the fastening member 60 and the gusset plate 59 near the fastening member 60.
The present reinforcing structure 1 frictionally connects the first reinforcing member 5, the second reinforcing member 10 arranged on the opposite side of the brace member 58 to the first reinforcing member 5, the column 56 and the first reinforcing member 5. The first connecting portion 15A connected by joining, the second connecting portion 15B connecting the brace member 58 and the first reinforcing member 5 and the second reinforcing member 10 by friction welding, the beam 57 and the second reinforcing member. And a third connection portion 15C connecting the member 10 by friction welding.
The term "friction welding" as used herein means that a plurality of members are joined to each other by static friction force.
In the present embodiment, the fourth connecting portion of the present invention is formed integrally with the second connecting portion 15B.

Hereinafter, first, an example of the shape of the reinforcing members 5 and 10 will be described.
As shown in FIG. 2, the first reinforcing member 5 includes a reinforcing plate main body 6 and end plates 7 and 8 provided at each end of the reinforcing plate main body 6. The end plate 7 is formed in a shape that comes into contact with the flange 56 a of the column 56 (see FIG. 1). The end plate 8 is formed in a shape that comes into contact with the second plate member 58c of the brace member 58. The first reinforcing member 5 can be formed by bending or welding a plate-like steel material or the like.

As shown in FIG. 3, the second reinforcing member 10 includes a reinforcing plate main body 11 and end plates 12 and 13 provided at each end of the reinforcing plate main body 11. The end plate 12 is formed in a shape that contacts the flange 57 a of the beam 57 (see FIG. 1). The end plate 13 is formed in a shape that comes into contact with the second plate member 58c of the brace member 58. As shown in FIG. 4, the end plate 13 is disposed on the side opposite to the end plate 8 of the first reinforcing member 5 with respect to the second plate member 58 c of the brace member 58. That is, the end plate 8, the second plate member 58c, and the end plate 13 are arranged so as to be in contact with each other in the thickness direction (second direction) X of the second plate member 58c. Here, the end plate 8 and the second plate member 58c are in contact with each other in the thickness direction X, which means that the outer surface of the end plate 8 perpendicular to the thickness direction X is perpendicular to the thickness direction X of the second plate member 58c. It means that the outer surface makes contact.
The second reinforcing member 10 can be formed similarly to the first reinforcing member 5.
As shown in FIG. 1, the reinforcing members 5 and 10 are arranged so as to sandwich the connecting portion 62.

In the present embodiment, the configurations of the connection portions 15A, 15B, and 15C are the same. For this reason, for the configuration of the second connection portion 15B, a numeral, or a capital letter “B” is added to a numeral and a lowercase letter, and the configuration corresponding to the second connection portion 15B of the connection portions 15A and 15C is the second connection portion. This is indicated by adding uppercase letters "A" and "C" to the same numeral, or numeral and lowercase alphabet, as in the part 15B. Thus, duplicate description will be omitted. For example, the connection portion main body 16B of the second connection portion 15B and the connection portion main body 16A of the first connection portion 15A have the same configuration.
The same applies to connection portions 25A, 25B, and 25C described later.

As shown in FIG. 4, the second connection portion 15B has a connection portion main body 16B formed in a C shape in a side view, and a male screw portion 17B screwed to the female screw portion 16aB of the connection portion main body 16B. ing. The inner surface 16bB of the connecting portion main body 16B facing the tip of the male screw portion 17B is flat. The user rotates the male screw portion 17B around the axis of the male screw portion 17B with respect to the connection portion main body 16B, and changes the position at which the male screw portion 17B is screwed into the female screw portion 16aB. Thereby, the distance between the inner surface 16bB of the connection portion main body 16B and the tip of the male screw portion 17B can be adjusted. A general tool such as a screwdriver or a spanner can be used to rotate the male screw portion 17B.
It is preferable that the connection portion main body 16B and the male screw portion 17B are formed of a steel material or the like.

  The end plate 8, the second plate member 58c, and the end plate 13 are sandwiched between the inner surface 16bB of the connection portion main body 16B and the male screw portion 17B. By rotating the male screw portion 17B and pressing the end plate 8, the second plate member 58c, and the end plate 13 from the outside to the inside in the thickness direction X, the end plate 8, the second plate member 58c, and The end plates 13 are connected by friction welding. The second connection portion 15B sandwiches (holds) three plates. The second connection portion 15B is a friction-joined metal member formed of a steel material or the like.

  A static friction force acts between the inner surface 16bB of the connecting portion main body 16B and the end plate 8, and the inner surface 16bB of the connecting portion main body 16B and the end plate 8 are joined. The same applies to the space between the end plate 8 and the second plate material 58c of the brace material 58, the space between the second plate material 58c of the brace material 58 and the end plate 13, and the space between the end plate 13 and the male screw portion 17B. .

The first connection part 15A and the third connection part 15C are configured similarly to the second connection part 15B. As shown in FIG. 1, the flange 56a of the column 56 and the end plate 7 of the first reinforcing member 5 are arranged side by side so as to contact in the thickness direction (first direction) of the flange 56a. The first connection portion 15A presses the flange 56a and the end plate 7 from the outside in the thickness direction of the flange 56a toward the inside, thereby connecting the flange 56a and the end plate 7 by friction welding. I have.
The flange 57a of the beam 57 and the end plate 12 of the second reinforcing member 10 are arranged side by side so as to contact in the thickness direction of the flange 57a. The third connection portion 15C presses the flange 57a and the end plate 12 from the outside in the thickness direction of the flange 57a toward the inside, thereby connecting the flange 57a and the end plate 12 by friction welding. I have.

The first connection portion 15A and the third connection portion 15C sandwich two plates.
As described above, the first reinforcing member 5 is arranged so as to straddle the connecting portion 62, and both ends of the first reinforcing member 5 are connected to the columns 56 and the brace members 58. The second reinforcing member 10 is arranged so as to straddle the connecting portion 62, and both ends of the second reinforcing member 10 are connected to the beam 57 and the brace member 58.
Although not shown, the other end of the brace member 58 has the same configuration as the one end 58a of the brace member 58. The other end of the brace member 58 is connected to the column 56, the beam 57, and the gusset plate 59 by the reinforcing structure 1 and the fastening member 60.

Next, the operation of the reinforcing structure 1 configured as described above will be described.
For example, the case where the distance between the gusset plates 59 in the direction Y along the brace material 58 is increased due to the deformation of the columns 56 and the beams 57 will be described. At this time, the brace member 58 is pulled over the entire length in the direction Y, and the column 56 and the beam 57 pull the center of the brace member 58 in the direction Y via the reinforcing members 5 and 10 of the reinforcing structure 1. Therefore, a part of the tensile force (external force) is transmitted to the brace member 58 without passing through the connecting portion 62 between the gusset plate 59 and the brace member 58. Therefore, the tensile force acting on the connecting portion 62 can be suppressed, and the connecting portion 62 can be reinforced.
Similarly, in the case where the distance between the gusset plates 59 in the direction Y is reduced and the brace material 58 is compressed in the direction Y, the reinforcing structure 1 similarly suppresses the compressive force acting on the connecting portion 62 and reinforces the connecting portion 62. be able to.

Next, simulation results when a tensile load is applied to the existing steel frame 55 having the reinforcing structure 1 of the embodiment and the existing steel frame 55 of the comparative example having no reinforcing structure 1 will be described.
In a conventional existing steel frame 55 which is a comparative example shown in FIG. 5, the reinforcing structure 1 is not used. It is assumed that the first plate member 58b of the brace member 58 is connected to the gusset plate 59 by the fastening member 60, and the second plate member 58c is not connected to the gusset plate 59. At this time, in the region R1 of the second plate member 58c of the brace member 58, which is a portion separated from the first plate member 58b, the tensile force and the compressive force acting between the gusset plates 59 act less than in the first plate member 58b. do not do. In other words, the region R1 does not significantly contribute to the rigidity of the brace member 58.

FIG. 6 shows a result of simulating a displacement of the brace member 58 when a tensile load is applied to the brace member 58 of the example and the comparative example by FEM (Finite Element Method) analysis. The horizontal axis in FIG. 6 represents the displacement (mm) of the brace member 58, and the vertical axis represents the tensile load (kN (kilo Newton)) applied to the brace member 58.
A line L1 indicated by a dashed line indicates the yield stress (316 kN) of the material (base material) on which the brace material 58 is formed. The solid line L2 represents the tensile load of the brace member 58 of the example, and the dotted line L3 represents the tensile load of the brace member 58 of the comparative example.
For example, the length of the brace material 58 of the example and the comparative example was 5000 mm.

In the brace member 58 of the comparative example, the displacement of the brace member 58 is increased, and the fastening member 60 of the connection portion 62 is damaged in the region R2 where the displacement is about 7 mm. Therefore, the tensile load is reduced in the region R2.
On the other hand, in the brace member 58 of the embodiment, since the connecting portion 62 is reinforced by the reinforcing structure 1, damage to the connecting portion 62 is suppressed. For this reason, even if the brace member 58 is displaced by 8 mm, the connection portion 62 is not damaged, and can withstand a tensile load of about the yield stress of the material on which the brace member 58 is formed.
In the brace member 58 of the embodiment, since the region R1 of the second plate member 58c is pressed by the second connection portion 15B as shown in FIG. 4, the tensile force and the compressive force are also transmitted to this region R1. Therefore, the tensile force and the compressive force can be transmitted by the entire brace member 58.

Since the reinforcing structure 1 is used in the brace member 58 of the embodiment, the buckling length of the brace member 58 is L11 which is the length between the second connection portions 15B as shown in FIG. On the other hand, since the reinforcing structure 1 is not used in the brace member 58 of the comparative example, the buckling length of the brace member 58 is L12 which is the length between the connection portions 62.
In the brace member 58 of the embodiment, the buckling length can be made shorter and the buckling resistance can be improved as compared with the brace member 58 of the comparative example.

  As described above, according to the reinforcing structure 1 of the present embodiment, the first reinforcing member 5 is disposed so as to straddle the connection portion 62, and the column 56 and the first reinforcing member 5, and the brace member 58 and the first reinforcing member. The members 5 are connected by friction welding. Friction welding is welding that does not use fire such as welding. Since the first reinforcing member 5 is formed of a steel material, it has heat resistance. External forces such as a compressive force and a tensile force acting on the column 56 or the brace member 58 are also transmitted to the first reinforcing member 5, the first connecting portion 15A, and the second connecting portion 15B, and the external force can be dispersed. Therefore, the external force borne by the connecting portion 62 can be reduced, and the connecting portion 62 can be reinforced.

In the reinforcing structure 1, the connecting portion 62 can be reinforced with no fire.
External force can be transmitted not only in the first plate member 58b of the brace member 58 but also in the region R1 of the second plate member 58c.
Since the buckling length is L11 which is the length between the second connecting portions 15B, the compressive buckling resistance of the brace member 58 can be improved.
As the column 56, the beam 57, and the brace member 58, a section steel having a desired cross-sectional shape such as an H section steel, an I section steel, an angle section steel, and a T section steel can be used.

The reinforcing structure 1 includes a second reinforcing member 10 and a third connecting portion 15C. The first reinforcing member 5 and the second reinforcing member 10 are arranged so as to sandwich the connecting portion 62, and the beam 57 and the second reinforcing member 10 and the brace member 58 and the second reinforcing member 10 are connected by friction welding. ing. By reinforcing the connection portions 62 from both sides with the reinforcing members 5 and 10, the connection portions 62 can be more reliably reinforced.
Since the fourth connecting portion is formed integrally with the second connecting portion 15B, the reinforcing structure 1 can be easily formed.

The column 56 and the first reinforcing member 5 are arranged side by side so as to be in contact with each other in the thickness direction X, and the first connecting portion 15A presses the column 56 and the first reinforcing member 5 from outside in the thickness direction X. ing. For this reason, a static friction force acts between the first connecting portion 15A and the column 56, between the column 56 and the first reinforcing member 5, and between the first reinforcing member 5 and the first connecting portion 15A. . Therefore, the column 56 and the first reinforcing member 5 can be connected without using fire such as welding.
Similarly to the first connection portion 15A, the brace member 58 and the first reinforcing member 5 can be connected to the second connection portion 15B without using fire such as welding.

(2nd Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 10, but the same parts as those in the above embodiment will be denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described. explain.
As shown in FIG. 7, the reinforcing structure 2 of the present embodiment includes a first connecting portion 25A, a second connecting portion 25B, and a third connecting portion 15A, 15B, and 15C of the reinforcing structure 1 of the first embodiment. A connection portion 25C is provided.
Since the configurations of the connection portions 25A, 25B, and 25C are similar, the first connection portion 25A will be described as an example.

As shown in FIG. 8, the first connecting portion 25A includes a first axial hole 26A formed in the flange 56a of the column 56 and a reinforcing main hole 27A formed in the end plate 7 of the first reinforcing member 5. And a bolt (first engagement member) 28A disposed in the first axial hole 26A and the reinforcing main hole 27A. The male screw portion 28aA of the bolt 28A is inserted into the first axial hole 26A and the reinforcing main hole 27A. The male screw portion 28aA is engaged with the first axial hole portion 26A and the reinforcing main hole portion 27A in the radial direction of the male screw portion 28aA. The head 28bA of the bolt 28A is engaged with the end plate 7 in the thickness direction of the end plate 7. A female screw portion 29aA of a nut 29A is screwed into the male screw portion 28aA. The nut 29A is engaged with the flange 56a in the thickness direction of the end plate 7.
As described above, the first connection portion 25A connects the column 56 and the bolt 28A by the engagement connection, and also connects the first reinforcing member 5 and the bolt 28A by the engagement connection. The term "engagement joining" as used herein means that a plurality of members are joined to each other by engaging.
The first connecting portion 25A is engaged with two plates.

The first axial hole 26A of the column 56 and the reinforcing main hole 27A of the first reinforcing member 5 can be formed by a known drill or the like. A general tool such as a screwdriver or a spanner can be used to tighten the screw between the bolt 28A and the nut 29A. In the present embodiment, the column 56 requires two steps of forming a first axial hole 26A, which is a pilot hole, and inserting a bolt 28A into the first axial hole 26A.
As shown in FIG. 9, the first axial hole 26 </ b> A and the like of the column 56 may be formed by injecting a high-pressure water jet W from a known water jet device 70. The water jet device 70 can be used safely even in a place where the use of fire is restricted, such as in the building 50 of a steel mill.
The first axial hole 26A and the like may be formed by an impact driver.

The second connecting portion 25B is configured in the same manner as the first connecting portion 25A, except that the number of plates engaged with the first connecting portion 25A is different. The second connection portion 25B is engaged with the three plates. The second connection part 25B is formed integrally with the fourth connection part of the present invention.
Although not shown, the second connecting portion 25B includes a reinforcing sub-hole formed in the end plate 8 of the first reinforcing member 5, a brace hole formed in the second plate member 58c of the brace member 58, and a second A hole formed in the end plate 13 of the reinforcing member 10 and a bolt (the second bolt) which is disposed in the hole and connected to the first reinforcing member 5, the brace member 58, and the second reinforcing member 10 by engaging and joining. Two engagement members).
25 C of 3rd connection parts are comprised similarly to 25 A of 1st connection parts.

As described above, according to the reinforcing structure 2 of the present embodiment, the connection portion 62 between the gusset plate 59 and the brace member 58 in the existing steel frame 55 has heat resistance without using fire such as welding. Can be reinforced.
Furthermore, the first connecting portion 25A includes a first axial hole 26A of the column 56, a main reinforcing hole 27A of the first reinforcing member 5, and a bolt 28A. The pillar 56 and the bolt 28A, and the bolt 28A and the first reinforcing member 5 are engaged and joined. Therefore, the column 56 and the first reinforcing member 5 can be connected via the bolt 28A without using fire such as welding.
Similarly to the first connection portion 25A, the second connection portion 25B can connect the brace member 58 and the first reinforcing member 5 via bolts without using fire such as welding.

In the present embodiment, as shown in FIG. 10, the first connecting portion 35A includes the first axial hole 26A of the column 56, the main reinforcing hole 27A of the first reinforcing member 5, and the first axial portion. A tapping screw (first engagement member) 36 </ b> A disposed in the shape hole 26 </ b> A and the reinforcing main hole 27 </ b> A may be provided. The first axial hole 26A is a prepared hole for the tapping screw 36A.
In this example, the inner diameter of the reinforcing main hole 27A of the first reinforcing member 5 is larger than the outer diameter of the male screw portion 36aA of the tapping screw 36A, and the male screw portion 36aA is inserted through the reinforcing main hole 27A. The head 36bA of the tapping screw 36A is engaged with the first reinforcing member 5.
The initial inner diameter of the pillar 56 at which the first axial hole 26A is formed is smaller than the outer diameter of the tip side of the male screw portion 36aA of the tapping screw 36A. The male screw portion 36aA is engaged with the column 56 by screwing the male screw portion 36aA into the first axial hole portion 26A and screwing it.
Even if the first connecting portion 35A is configured as described above, the column 56 and the first reinforcing member 5 can be engaged and joined by the first connecting portion 35A.

The first axial hole 26A of the column 56 does not have to penetrate the flange 56a, and the first axial hole 26A does not have to be formed in the flange 56a. This is because, when the thickness of the flange 56a is small, the tapping screw 36A can be screwed into the flange 56a by pushing and turning the tapping screw 36A even if a pilot hole is not formed in advance.
When the first axial hole portion 26A is not formed in the flange 56a, the pillar 56 can be completed by one step of screwing the tapping screw 36A into the flange 56a.

As described above, the first embodiment and the second embodiment of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the configuration does not deviate from the gist of the present invention. Change, combination, deletion, etc. are also included. Further, it goes without saying that the configurations shown in the embodiments can be used in appropriate combinations.
For example, in the first embodiment and the second embodiment, the fourth connection portion is configured integrally with the second connection portion, but the fourth connection portion is configured separately from the second connection portion. May be. In this case, the fourth connecting portion connects the brace member 58 and the second reinforcing member 10 by friction joining or engagement joining.

The reinforcing structure 1 does not need to include the second reinforcing member 10 and the third connecting portion 15C. This is because the connection portion 62 can be reinforced by only the first reinforcement member 5, the first connection portion 15A, and the second connection portion 15B.
It is assumed that the first shaft-like member is a column 56 and the second shaft-like member is a beam 57. However, the first shaft member may be the beam 57 and the second shaft member may be the column 56.

1, 2 Reinforcement structure (reinforcement structure of existing steel frame)
5 First reinforcing member 10 Second reinforcing member 15A, 25A, 35A First connecting portion 15B, 25B Second connecting portion 15C, 25C Third connecting portion 26A First axial hole 27A Reinforced main hole 28A Bolt (first Engaging member)
36A tapping screw (first engagement member)
55 Existing steel frame 56 Pillar (first shaft member)
57 Beam (Second Shaft Member)
58 Brace material 58a End 59 Gusset plate (connecting member)
62 connection part X thickness direction (second direction)

Claims (7)

A connecting member provided at a portion where the column and the beam are fixed in the existing steel frame, and a reinforcing structure of the existing steel frame that reinforces a connecting portion between the brace member and an end connected to the connecting member,
A first reinforcing member formed of steel,
A first connecting portion connecting the first shaft-shaped member and the first reinforcing member, which is one of the column and the beam, by friction joining or engagement joining;
A second connecting portion connecting the brace material and the first reinforcing member by friction joining or engagement joining;
Bei to give a,
The first reinforcing member,
A reinforcing plate body formed in a flat shape,
A first end plate provided at a first end of the reinforcing plate body;
A second end plate provided at a second end of the reinforcing plate body;
With
The first connection portion connects the first shaft-shaped member and the first end plate by friction joining or engagement joining,
The second connecting portion is a reinforcing structure of an existing steel frame that connects the brace material and the second end plate by friction joining or engagement joining . A second reinforcing member formed of a steel material and disposed on the opposite side to the first reinforcing member with respect to the brace material,
A third connecting portion connecting the second shaft-shaped member, which is the other of the column and the beam, and the second reinforcing member by friction joining or engagement joining,
A fourth connecting portion connecting the brace material and the second reinforcing member by friction joining or engagement joining;
The reinforcing structure for an existing steel frame according to claim 1, further comprising: A connecting member provided at a portion where the column and the beam are fixed in the existing steel frame, and a reinforcing structure of the existing steel frame that reinforces a connecting portion between the brace member and an end connected to the connecting member,
A first reinforcing member formed of steel,
A first connecting portion connecting the first shaft-shaped member and the first reinforcing member, which is one of the column and the beam, by friction joining or engagement joining;
A second connecting portion connecting the brace material and the first reinforcing member by friction joining or engagement joining;
A second reinforcing member formed of a steel material and disposed on the opposite side to the first reinforcing member with respect to the brace material,
A third connecting portion connecting the second shaft-shaped member, which is the other of the column and the beam, and the second reinforcing member by friction joining or engagement joining,
A fourth connecting portion connecting the brace material and the second reinforcing member by friction joining or engagement joining;
With
The fourth connecting portion is a structure for reinforcing an existing steel frame integrally formed with the second connecting portion. The first shaft-shaped member and the first reinforcing member are arranged side by side so as to contact in the first direction,
The first connecting portion presses the first shaft-shaped member and the first reinforcing member from the outside in the first direction, so that the first shaft-shaped member and the first reinforcing member are in friction with each other. The reinforcing structure for an existing steel frame according to any one of claims 1 to 3, wherein the structure is connected by joining. The brace material and the first reinforcing member are arranged side by side so as to contact in the second direction,
The second connection portion connects the brace material and the first reinforcement member by friction welding by pressing the brace material and the first reinforcement member from outside in the second direction. The reinforcing structure for an existing steel frame according to any one of claims 1 to 4. The first connection portion,
A first axial hole formed in the first axial member,
A reinforcing main hole formed in the first reinforcing member,
Along with being arranged in the first shaft-shaped hole portion and being connected to the first shaft-shaped member by an engagement joint, arranged in the reinforcement main hole portion and being connected to the first reinforcement member by an engagement joint. A first engaging member,
The reinforcing structure for an existing steel frame according to any one of claims 1 to 3, further comprising: The second connection portion,
Brace holes formed in the brace material,
A reinforcing sub-hole formed in the first reinforcing member,
A second engagement member disposed in the brace hole and connected to the brace material by an engagement joint, and disposed in the reinforcement sub-hole and connected to the first reinforcement member by an engagement joint When,
The reinforcing structure for an existing steel frame according to any one of claims 1 to 3, and 6, further comprising:

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