Reinforcement connection structure for existing frame members

Abstract

To provide a reinforcement connection part structure that reinforces particularly a part near an existing structure by fitting a joint metal for connecting a reinforcement member such as a frame bar to a connection part by non-welding on an existing steel frame member.SOLUTION: A reinforcement connection part structure is constituted by including a rectangular annular frame hardware 12 installed so as to surround a connection part 50a and a cement-based solidification material 17, which engulfs a steel frame member 52 and is placed in the inside of the rectangular annular frame hardware 12. A plurality of stud members 13 are fitted so as to protrude inward from an inside surface 12b of the rectangular annular frame hardware 12. The rectangular annular frame hardware 12 and the cement-based solidification material 17 are constructed by non-welding and fixed around the steel frame member 50 of the connection part 50a at a construction site. A reinforcement member 20 is connected by non-welding to a joint metal 11 of the rectangular annular frame hardware 12 and the reinforcement member 20 is integrally connected to the steel frame member 50.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a reinforcing connection structure for existing frame members, and in particular to a reinforcing connection structure for existing frame members that is used when connecting reinforcing members to existing steel frame members that form the frame structure of an existing building. [Background technology]

[0002] In recent years, in existing buildings, it has become necessary to reinforce the frame structure, which is the part that supports loads, in order to counter aging and improve earthquake resistance, etc. For example, as a means for effectively reinforcing a steel frame structure, construction methods and structures have been used in which steel reinforcing members, such as brace materials and frame materials, are integrally connected to the existing frame structure to reinforce it. In such construction methods and structures that use reinforcing members, generally, connecting metal fittings, such as gusset plates, are attached by welding or the like to the steel frame members (steel frame members) that make up the frame structure of the existing building at the construction site of the reinforcement work, and the reinforcing members are integrally connected to the frame structure via these connecting metal fittings.

[0003] Furthermore, for example, if the existing building to be reinforced is a factory or other facility and reinforcement work is to be carried out while the building continues to be in operation and use, it is considered inappropriate to use firearms such as welding to attach metal joints to steel frame members. Therefore, methods and structures have been proposed in which metal joints are attached using non-welding work that does not use firearms, thereby reinforcing the frame structure of the existing building with reinforcing members such as braces (see, for example, Patent Document 1 and Patent Document 2).

[0004] According to the methods and structures disclosed in Patent Documents 1 and 2 for reinforcing the framework of an existing building without welding using reinforcing members such as braces, the reinforcing method of Patent Document 1 involves bonding a portion of a gusset plate, which is a metal joint, to a column or beam, which is a steel framework member, and clamping the column or beam between the gusset plate and an opposing plate, and then bolting the gusset plate to the opposing plate to prevent separation of the gusset plate to which the reinforcing member such as a brace is connected. Furthermore, the reinforcing structure of Patent Document 2 involves placing a pair of steel plates, each with a gusset plate already joined to it, facing each other so as to sandwich the column or beam, and abutting the column or beam against the column or beam. Then, the pair of steel plates are tightened with bolts to firmly secure the gusset plate to which the reinforcing member such as a brace is connected to the column or beam. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-177797 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-153582 Summary of the Invention [Problem to be solved by the invention]

[0006] However, according to the methods and structures disclosed in Patent Documents 1 and 2 for reinforcing the framework of an existing building without welding using reinforcing members such as braces, a gusset plate and an opposing plate, or a pair of steel plates to which a gusset plate has been previously joined, are fixed to the column or beam by firmly tightening bolt members and connecting them. This can easily cause excessive stress to be generated in the steel framework members where the gusset plate is attached and the reinforcing members are connected due to the strong tightening force. Therefore, when reinforcing the framework of an existing building, particularly an aging one, with reinforcing members such as braces, it is possible that a stable reinforced structure cannot be obtained due to the stress generated in the portions of the aging existing steel framework members where the reinforcing members are connected.

[0007] Furthermore, even if the steel frame members of an existing frame structure that are reinforced by connecting reinforcing members are located close to an existing structure, such as a wall, it is necessary to ensure that a stable reinforced structure is obtained using the reinforcing members.

[0008] The present invention aims to provide a reinforcing connection structure for existing frame members, which can be attached to the connecting parts of the reinforcing members without welding, without generating stress due to tightening force, by connecting metal joints that connect reinforcing members such as braces to existing steel frame members that form the frame structure of an existing building, and which can stably reinforce the frame structure of an existing building with reinforcing members, even when the steel frame members to be reinforced are located close to an existing structure. [Means for solving the problem]

[0009] The present invention is a reinforcing connection structure for existing frame members that is used when reinforcing existing steel frame members that form the frame structure of an existing building by connecting reinforcing members such as brace materials and frame materials to the frame structure, and the structure comprises a rectangular ring frame metal that is installed in a rectangular shape around the connecting portion of the reinforcing member in the steel frame member, with connecting hardware for the reinforcing member attached so as to protrude outward from the side portion, a plurality of stud members that are attached so as to protrude inward from the inner side surface of the rectangular ring frame metal, and the steel frame members of the connecting portion are filled inside the rectangular ring frame metal and solidified so as to encase them. The connecting metal fittings are joined as a unit to the side portions of the rectangular ring frame metal fittings before construction at the construction site, and at the construction site, the rectangular ring frame metal fittings and the cement-based solidification material are installed without welding and fixed around the steel frame members at the connecting portion, and the reinforcing members are connected to the connecting metal fittings of the rectangular ring frame metal fittings without welding and joined as a unit to the steel frame members, thereby reinforcing the frame structure formed by the steel frame members.This achieves the above-mentioned object by providing a reinforcing connection structure for existing frame members.

[0010] Furthermore, it is preferable that the reinforcing connection structure of an existing frame member of the present invention is such that the connection portion of the reinforcing member in the steel frame member is the portion that is close to the existing structure, and the stud member is attached so as to protrude inward from the inner surface of the edge of the rectangular ring frame metal member that is away from the existing structure.

[0011] In addition, it is preferable that the reinforcing connection structure of the existing frame member of the present invention is such that the stud member is integrally joined to the rectangular ring frame metal member in advance before construction at the construction site.

[0012] Furthermore, in the reinforcing connection structure of an existing frame member of the present invention, it is preferable that the stud member is a bolt member fastened to a fastening hole drilled and formed in the rectangular annular frame metal member.

[0013] Furthermore, it is preferable that the reinforcing connection structure of the existing frame member of the present invention is such that the stud member is a bolt member threaded onto a nut member which is previously joined as a single unit to the inner surface of the rectangular annular frame metal before construction at the construction site.

[0014] In addition, in the reinforcing connection structure for an existing frame member of the present invention, it is preferable that the connecting metal is a gusset plate in which bolt fastening holes are formed in advance.

[0015] Furthermore, in the reinforcing joint structure for an existing frame member of the present invention, it is preferable that the cement-based solidification material is non-shrinkage mortar.

[0016] Furthermore, in the reinforcing connection structure of an existing frame member of the present invention, the rectangular ring-shaped frame metal is installed in a rectangular shape around the connection portion of the reinforcing member in the steel frame member, and is installed in a state where it is offset in one direction relative to the connection portion, so that the gap between the rectangular ring-shaped frame metal and the steel frame member at the connection portion has an expanded region where the gap width is larger than in other regions, and it is preferable that the stud member is attached in this expanded region so as to protrude inward from the inner surface of the rectangular ring-shaped frame metal. [Effects of the Invention]

[0017] According to the connection structure for reinforcing existing frame members of the present invention, connecting hardware that connects reinforcing members such as braces to existing steel frame members that form the frame structure of an existing building can be attached to the connection parts of the reinforcing members without welding, without generating stress due to tightening force.In particular, even when the steel frame members to be reinforced are located close to existing structures, the frame structure of the existing building can be reinforced in a stable state by the reinforcing members. [Brief explanation of the drawings]

[0018] [Figure 1]1 is a schematic front view illustrating a steel frame member of a frame structure to be reinforced using a reinforcing connection structure for an existing frame member according to a preferred embodiment of the present invention. [Figure 2] 2 is an enlarged view of part A in FIG. 1 illustrating the structure of a reinforcing connection portion for an existing frame member according to a preferred embodiment of the present invention. [Figure 3] 3 is a cross-sectional view taken along the line BB in FIG. 2, illustrating a reinforcing connection structure for an existing frame member according to a preferred embodiment of the present invention. [Figure 4] 3 is a cross-sectional view taken along the line BB in FIG. 2, illustrating another form of reinforcing connection portion structure. [Figure 5] 3 is a cross-sectional view taken along the line BB in FIG. 2, illustrating another form of reinforcing connection portion structure. DETAILED DESCRIPTION OF THE INVENTION

[0019] A preferred embodiment of the present invention, in which a connecting portion structure 10 for reinforcing an existing frame member is used, as shown in FIG. 1, as a structure for a connecting portion 50a of a frame material (reinforcing member) 20 in a steel frame member (column material) 50, for example, which forms the frame structure of an existing dilapidated building, in order to effectively reinforce the existing frame structure by connecting a reinforcing member 20 made of, for example, a frame material to, for example, a steel column material.

[0020] Furthermore, in the reinforcing connection structure 10 of this embodiment, the columns 50, which are steel frame members forming a framework structure reinforced by the frame members (reinforcing members) 20, are placed in close proximity to existing walls 51 as existing structures, and even in such cases, the framework structure of an existing building can be reinforced in a stable state by the frame members 20 connected to the columns 50. Furthermore, in the reinforcing connection structure 10 of this embodiment, the metal joints 11 that connect the frame members 20, which are reinforcing members, to the columns 50, which are existing steel frame members, can be attached to the connecting portions 50a where the frame members 20 are connected without welding, without generating stress due to tightening force.

[0021] The reinforcing joint structure 10 for existing frame members of this embodiment is a reinforcing joint structure used to connect a reinforcing member, preferably a frame member 20, to a column member 50, which is an existing steel frame member that forms the frame structure of an existing building, to reinforce the frame structure. As shown in Figures 2 and 3, it includes a rectangular ring frame metal 12, which is installed in a rectangular shape around the connecting portion 50a of the reinforcing member 20 of the column member 50, and has connecting metal members 11 for connecting the reinforcing member 20 attached to the column member 50 protruding outward from the side portion 12a, a plurality of stud members 13 (see Figure 3) attached to the inner surface 12b of the rectangular ring frame metal 12 protruding inward, and a cement-based solidification material 17 (see Figure 3) filled inside the rectangular ring frame metal 12 and solidified, so as to envelop the column member 50 at the connecting portion 50a. The connecting metal members 11 are integrally joined to the side portion 12a of the rectangular ring frame metal 12 before construction at the construction site. At the construction site, the rectangular ring-shaped frame metal fittings 12 and cement-based solidification material 17 are installed without welding and fixed around the column material 50 at the connecting portion 50a, and the tip portion 20a of the frame material 20 is connected to the connecting metal fittings 11 of the rectangular ring-shaped frame metal fittings 12 without welding, and the frame material 20 is joined integrally to the column material 50, thereby reinforcing the framework structure formed by the column material 50.

[0022] In addition, in this embodiment, the connecting portion 50a of the frame material 20 in the column material 50 is a portion that is close to a wall 51, which is an existing structure, and the stud member 13 is attached by protruding inward from the inner surface 12b of the edge portion of the rectangular ring-shaped frame hardware 12 that is away from the existing wall 51 (see Figure 3).

[0023] Furthermore, in this embodiment, the rectangular ring frame metal fitting 12, which is installed in a rectangular shape around the connecting portion 50a of the frame members 20 in the pillar member 50, is installed in a state where it is offset in one direction (away from the wall 51) relative to the connecting portion 50a of the pillar member 50, so that the gap portion 16 between the rectangular ring frame metal fitting 12 and the pillar member 50 at the connecting portion 50a has an expanded region 16a where the gap width is larger than in other regions (see FIG. 3). In this expanded region 16a, the stud member 13 is attached so as to protrude inward from the inner surface 12b of the rectangular ring frame metal fitting 12.

[0024] In this embodiment, columns 50, which are steel frame members forming the framework of an existing, dilapidated building, are made of square steel pipes 52, as shown in Figure 1. The column 50 made of square steel pipe 52 can be fixed to its connecting portion 50a of its frame member 20, preferably with rivet members 53, without welding, through fixing holes drilled by a drill, so that its head 53a can be made to protrude from the outer circumferential surface of the square steel pipe 52 at the connecting portion 50a.

[0025] 2 and 3, the rectangular annular frame metal 12 constituting the reinforcing connection structure 10 of this embodiment is formed by assembling a first frame metal 14 made of a channel steel and a second frame metal 15 having a U-shaped cross section. The first frame metal 14 is made of, for example, a channel steel, and is assembled with its flat plate portion 14a along the surface of the square steel pipe 52 facing the existing wall 51 between the column material 50 and the existing wall 51, with the flat plate portion 14a positioned at a distance from the facing surface and the existing wall 51. The first frame metal 14 is positioned so that rib portions 14b on both sides of the channel steel protrude toward the opposite side from the existing wall 51, and these rib portions 14b have bolt fastening holes formed in them.

[0026] The second frame metal fitting 15 is a steel member having a U-shaped cross section, for example, consisting of an intermediate plate portion 15a and a pair of side plate portions 15b joined to each other and projecting vertically from both side edges of the side plate portion 15b. A gusset plate 11 with a rectangular side surface is attached to the intermediate plate portion 15a, projecting vertically outward from the center of its outer surface, as a connecting hardware 11 for connecting to the frame material 20. The gusset plate 11, which is a connecting hardware, is joined to the intermediate plate portion 15a of the second frame metal fitting 15 as a single unit before construction at the construction site. A plurality of bolt fastening holes are formed in the gusset plate 11 before construction at the construction site. Bolt fastening holes are also formed in the tip portions of each of the pair of side plate portions 15b of the second frame metal fitting 15. A stud member 13, described below, is attached to the intermediate plate portion 15a, projecting inward from its inner surface 12b.

[0027] The first frame metal fitting 14 and the second frame metal fitting 15 are installed in a rectangular shape surrounding the periphery of the connecting portion 50a of the reinforcing member 20 in the column material 50. That is, as described above, the first frame metal fitting 14 can be assembled with the flat plate portion 14a arranged parallel to, for example, the surface of the square steel pipe 52 constituting the column material 50 facing the existing wall 51, while maintaining a gap between the square steel pipe 52 and the existing wall 51. The second frame metal fitting 15 can be assembled with the intermediate plate portion 15a arranged parallel to, for example, the surface of the square steel pipe 52 constituting the column material 50 opposite the existing wall 51, while maintaining a gap between the pair of side plate portions 15b and both side surfaces of the square steel pipe 52.

[0028] The first frame metal 14 and second frame metal 15 are assembled around the connecting portion 50a of the reinforcing member 20 in the pillar material 50, and the tip portions of the side plate portions 15b on both sides of the second frame metal 15 are overlapped inside the rib portions 14b on both sides of the first frame metal 14, and the bolt fastening holes formed in them are aligned with each other and the fixing bolts 18 are fastened, thereby forming a rectangular annular frame metal 12 that is installed in a rectangular shape surrounding the pillar material 50 and has connecting metal 11 with the reinforcing member 20 attached and protruding outward from the side portions 12a.

[0029] Furthermore, in this embodiment, the connecting portion 50a of the frame material 20 in the column material 50 is located close to a wall 51, which is an existing structure, and therefore the rectangular ring-shaped frame metal 12 formed by assembling the first frame metal 14 and the second frame metal 15 is fixed in a state where it is offset away from the wall 51 relative to the connecting portion 50 of the column material 50 (see FIG. 3). As a result, the gap 16 between the rectangular ring-shaped frame metal 12 and the column material 50 at the connecting portion 50a has an expanded region 16a where the gap width is larger than the other regions, on the side opposite the wall 51 across the column material 50. In this embodiment, a plurality of stud members 13 are attached to this expanded region 16a so as to protrude inward from the inner surface 12b of the rectangular ring-shaped frame metal 12.

[0030] In this embodiment, the multiple stud members 13 attached to the widened region 16a and protruding inward from the inner surface 12b of the rectangular ring frame 12 are each a bolt member previously joined, for example, by welding, to the inner surface of the intermediate plate portion 15a of the second frame member 15 constituting the rectangular ring frame 12 prior to construction at the construction site, as shown in Fig. 3. The stud members 13 may also be bolt members fastened, preferably without welding, to fastening holes pre-drilled into the intermediate plate portion 15a of the second frame member 15 constituting the rectangular ring frame 12 prior to construction at the construction site, as shown in Fig. 4. The stud members 13 may also be bolt members fastened, preferably without welding, to nuts 19 pre-joined, preferably without welding, to the inner surface of the intermediate plate portion 15a of the second frame member 15 constituting the rectangular ring frame 12 prior to construction at the construction site, as shown in Fig. 5.

[0031] The rectangular ring frame metal 12 made of the first frame metal 14 and the second frame metal 15 is supported, for example, on a pillar material 50 or a frame material 20, and a base plate (not shown) is attached detachably without welding using various known fixing hardware, and by assembling the first frame metal 14 and the second frame metal 15 onto the base, the rectangular ring frame metal 12 is attached around the connecting portion 50a of the reinforcing member 20 in the pillar material 50. The base plate, which serves as the base of the rectangular ring frame metal 12, can be used as a bottom formwork for the rectangular ring frame metal 12 when filling the inside of the rectangular ring frame metal 12 with cement-based solidification material 17.

[0032] As the cement-based solidification material 17 that is filled and solidified inside the rectangular ring frame metal 12 attached around the pillar material 50 at the connecting portion 50a as described above, various types of concrete or mortar can be used. From the viewpoints of improving workability when filling the inside of the rectangular ring frame metal 12 and improving quality after solidification, it is preferable to use various known non-shrinkage mortars as the cement-based solidification material 17.

[0033] The cementitious solidification material 17, such as non-shrinkage mortar, is filled without welding and without gaps by manually wrapping the square steel pipes 52 of the connecting portions 50a inside the rectangular ring frame metal fittings 12, for example, and then solidifies, allowing the cementitious solidification material 17 to be easily fixed around the connecting portions 50a of the framing members 20 in the column members 50 made of square steel pipes 52. Furthermore, as the filled cementitious solidification material 17 solidifies, the rectangular ring frame metal fittings 12 are also fixed integrally around the connecting portions 50a of the framing members 20 in the column members 50 made of square steel pipes 52. This forms the reinforcing connection structure 10 for existing frame members of this embodiment, which can reinforce a frame structure using the column members 50 by connecting the framing members 20 to the connecting metal fittings 11 of the rectangular ring frame metal fittings 12.

[0034] In this embodiment, the frame members 20 serving as reinforcing members connected to the connecting metal members 11 of the rectangular ring frame members 12 constituting the reinforcing connection structure 10 are preferably installed in a stable state by being assembled from the floor surface of an existing building. The frame members 20 are each provided with a horizontal frame 20b, for example, made of channel steel, which extends laterally toward the column member 50 made of square steel pipe 52 to be reinforced. The end portions 20a of the horizontal frame 20b are connected to the gusset plate, which is the connecting metal member 11 of the reinforcing connection structure 10, by bolt members 21 without welding, so that the frame structure using the column member 50 as a steel frame member can be reinforced in a stable state via the reinforcing connection structure 10.

[0035] Furthermore, according to the reinforcing connection structure 10 for existing frame members of this embodiment having the above-mentioned configuration, the connecting metal fittings 11, which connect the reinforcing members made of the frame members 20 to the pillar members 50 that form the frame structure of an existing building, can be attached to the connecting parts 50a of the frame members 20 without welding, without generating stress due to tightening force, and it is possible to reinforce the frame structure of an existing building in a stable state with the frame members 20, even when the steel frame members to be reinforced are located close to the existing structure 51, in particular.

[0036] That is, according to this embodiment, the reinforcing connection structure 10 is configured to include a rectangular ring frame metal 12 to which connecting metal fittings 11 are pre-joined, which is installed around the periphery of the connecting portion 50a of the frame material 20 in the column material 50 made of square steel pipes 52, and a cement-based solidification material 17 that is filled and solidified inside the rectangular ring frame metal 12. This makes it possible to fix the rectangular ring frame metal 12 to which connecting metal fittings 11 are pre-joined around the column material 50, which is a steel frame member, at the construction site without welding. Furthermore, the rectangular ring frame metal fittings 12 are firmly and integrally joined to the connecting parts 50a of the frame material 20 in the column material 50 via the cement-based solidification material 17 that has been filled inside and solidified, without causing stress on the column material 50 due to the tightening force.Therefore, the frame material 20, which is a reinforcing member, is connected without welding to the connecting metal fittings 11 of the rectangular ring frame metal fittings 12 that are joined integrally to the column material 50 at the connecting parts 50a, making it possible to stably and firmly reinforce the framework structure of an existing building with the frame material 20 via the rectangular ring frame metal fittings 12 and the cement-based solidification material 17.

[0037] Furthermore, in the reinforcing connection structure 10 of this embodiment, multiple stud members 13 are attached to protrude inward from the inner surface 12b of the rectangular ring frame metal 12. Therefore, when a shear force acts between the rectangular ring frame metal 12, which has a cement-based solidification material 17 filled inside, and the column member 50 of the connecting portion 50a, these stud members 13 can effectively exert bearing resistance via the cement-based solidification material 17. This also improves the bond strength of the cement-based solidification material 17, more firmly joining the rectangular ring frame metal 12 to the square steel pipe 52 of the connecting portion 50a of the column member 50 to which the framing member 20 is connected, making it possible to effectively reinforce the framework structure of an existing building with the framing member 20 in a more stable state.

[0038] In particular, in this embodiment, the column 50, which is the steel frame member to be reinforced, is positioned close to the wall 51, which is an existing structure, and as a result, the rectangular ring frame metal fitting 12 is positioned offset away from the existing wall 51, and in the gap 16 between the column 50 and the rectangular ring frame metal fitting 12 at the connecting portion 50a, a widened region 16a is created where the gap width is larger than in other regions. However, in this widened region 16a, the stud member 13 is attached so as to protrude inward from the inner surface 12b of the rectangular ring frame metal fitting 12. Therefore, in this widened region 16a in particular, it is possible to improve the bearing pressure resistance and adhesion strength of the cement-based solidification material 17. Therefore, even if the steel frame member to be reinforced is positioned close to the existing structure 51, it is possible to reinforce the frame structure of an existing building in a stable manner with the frame member 20.

[0039] The present invention is not limited to the above-described embodiment and various modifications are possible. For example, the reinforcing members for reinforcing the framework structure may be frame materials, braces, or other reinforcing steel materials. The connecting hardware of the rectangular ring frame to which the reinforcing members are connected does not necessarily have to be gusset plates, but may be various other known connecting hardware capable of connecting reinforcing members such as braces and frame materials without welding. The stud members may be bolts or various other hardware that can effectively exert bearing resistance via the cement-based solidification material. The cement-based solidification material filled and solidified inside the rectangular ring frame does not necessarily have to be non-shrink mortar, but may be various other cement-based solidification materials such as concrete or cement milk.

[0040] Furthermore, the steel frame members that form the frame structure to be reinforced using the reinforcing connector structure of the present invention may be beams other than columns. The steel frame members that form the frame structure to be reinforced do not necessarily have to be made of square steel pipes, and may be various other steel frame members such as H-shaped steel. [Explanation of symbols]

[0041] 10 Reinforcement connection structure 11 Gusset plate (joint metal) 12 Rectangular ring frame hardware 12a Side part 12b Inside surface 13 Stud member 14 First frame hardware 14a Flat plate part 14b Rib section 15 Second frame hardware 15a Intermediate plate section 15b Side plate part 16 Interval part 16a Widening area 17 Cement-based solidification materials 18 Fixing bolt 19 Nut material 20 Frame material (reinforcement material) 20a Tip part 21 Bolt material 50 Columns (steel frame members) 50a Connecting part 51 Existing Wall (Existing Structure) 52 Square steel pipe (steel frame member) 53 Rivet material 53a head

Claims

1. A reinforcing connection structure for an existing frame member that is used when connecting a reinforcing member such as a brace material or a frame material to an existing steel frame member that forms the frame structure of an existing building to reinforce the frame structure, The structure is comprised of a rectangular ring-shaped frame metal member, which is installed in a rectangular shape around the connecting portion of the steel frame member with the reinforcing member, and has connecting metal members with the reinforcing member attached so as to protrude outward from the side portion, a plurality of stud members attached so as to protrude inward from the inner side surface of the rectangular ring-shaped frame metal member, and a cement-based solidification material which is filled inside the rectangular ring-shaped frame metal member and solidified so as to encase the steel frame member of the connecting portion, and the connecting metal members are joined integrally to the side portion of the rectangular ring-shaped frame metal member in advance before construction at the construction site, At the construction site, the rectangular ring frame metal fittings and the cement-based solidification material are installed without welding and fixed around the steel frame members at the connecting portions, and the reinforcing members are connected to the connecting metal fittings of the rectangular ring frame metal fittings without welding, and the reinforcing members are joined integrally to the steel frame members, thereby reinforcing the frame structure by the steel frame members. The connection portion of the steel frame member with the reinforcing member is the portion close to the existing structure, and the stud member is attached by protruding inward from the inner surface of the edge of the rectangular ring frame metal fitting that is farther from the existing structure, creating a reinforcing connection structure for the existing frame member.

2. 2. The reinforcing joint structure for an existing frame member according to claim 1, wherein the stud member is integrally joined to the rectangular annular frame metal member before construction at the construction site.

3. 3. A reinforcing connection structure for an existing frame member according to claim 1 or 2, wherein the stud member is a bolt member fastened to a fastening hole drilled in the rectangular annular frame metal member.

4. The stud member is a bolt member threadedly attached to a nut member that is integrally joined to the inner surface of the rectangular annular frame metal before construction at the construction site.

5. 5. A reinforcing connection structure for an existing frame member according to claim 1, wherein the metal joint is a gusset plate having bolt fastening holes formed therein in advance.

6. 6. The reinforcing joint structure for existing frame members according to claim 1, wherein the cement-based solidification material is non-shrinkage mortar.

7. The rectangular ring-shaped frame metal fittings, which are installed in a rectangular shape around the connecting portion of the reinforcing member in the steel frame member, are installed in a state where they are offset in one direction relative to the connecting portion, so that the gap between the rectangular ring-shaped frame metal fittings and the steel frame member at the connecting portion has an expanded region where the gap width is larger than other regions, and in this expanded region, the stud members are attached so as to protrude inward from the inner surface of the rectangular ring-shaped frame metal fittings.

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