Reinforcement connection structure for existing frame members

Abstract

To provide a reinforcement connection part structure that reinforces by a reinforcement member by fitting a joint metal for connecting the reinforcement member such as a brace member to a connection part by non-welding on an existing steel frame member forming a frame structure of a building.SOLUTION: A reinforcement connection part structure is constituted by including a rectangular annular frame hardware 12, which is installed so as to surround a connection part 56 and previously fitted with a joint metal 11 to be joined with a reinforcement member 20, and a cement-based solidification material 17, which engulfs a steel frame member 52 and is placed and solidified in the inside 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 52 of the connection part 56 at a construction site. A frame structure 51 formed of the steel frame member 52 is reinforced by connecting the reinforcement member 20 by non-welding to the joint metal 11 and integrally connecting the reinforcement member 20 to the steel frame member 52.SELECTED DRAWING: Figure 2

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 (a metal joint) 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 or where 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 conceivable that a stable reinforced structure cannot be obtained due to the stress generated in the aging existing steel framework members.

[0007] The present invention aims to provide a reinforcing connection structure for existing frame members, which can attach connecting hardware to existing steel frame members that form the frame structure of an existing building, to the connecting parts without welding, without generating stress due to tightening force, and can reinforce the frame structure of an existing building in a stably manner with the reinforcing members. [Means for solving the problem]

[0008] The present invention relates to a reinforcing connection structure for existing frame members, which is used when reinforcing a frame structure by connecting reinforcing members such as brace materials and frame materials to existing steel frame members that form the frame structure of an existing building, and which includes a rectangular ring-shaped frame metal fitting that is installed in a rectangular shape around the periphery of the connecting portion of the reinforcing member in the steel frame member, and a connecting metal fitting with the reinforcing member that is attached so as to protrude outward from a side portion, and a cement-based solidification material that is filled inside the rectangular ring-shaped frame metal fitting so as to encase the steel frame member of the connecting portion and that has solidified. The connecting hardware is joined as a single unit to the side of the rectangular ring frame hardware in advance before construction at the construction site, and at the construction site, the rectangular ring frame hardware and the cement-based solidification material are installed without welding and fixed around the steel frame member at the connecting portion, and the reinforcing member is connected to the connecting hardware of the rectangular ring frame hardware without welding, and the reinforcing member is joined as a single unit to the steel frame member, thereby providing a reinforcing connection structure for existing frame members, thereby reinforcing the frame structure formed by the steel frame member, thereby achieving the above-mentioned object.

[0009] In the reinforcing connection structure for an existing frame member of the present invention, it is preferable that the metal joint is a gusset plate having bolt fastening holes formed therein in advance.

[0010] In addition, 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.

[0011] Furthermore, in the reinforcing connection structure for an existing frame member of the present invention, it is preferable that a plurality of rivet heads protrude from the surface of the steel frame member at the connection portion.

[0012] Furthermore, in the reinforcing connection structure of an existing frame member of the present invention, the rectangular annular frame metal is installed around the steel frame member of the connecting portion, maintaining a gap of at least 1.5 times the protruding height of the rivet head from the outer peripheral surface of the connecting portion, and it is preferable that the cement-based solidification material is filled in these gaps and solidified.

[0013] In addition, in the reinforcing connection structure for an existing frame member of the present invention, it is preferable that the steel frame member is made of a lattice structural material. [Effects of the Invention]

[0014] According to the connection structure for reinforcing existing frame members of the present invention, connecting hardware that connects reinforcing members such as brace materials to existing steel frame members that form the frame structure of an existing building can be attached to the connection part without welding without generating stress due to tightening force, and the frame structure of the existing building can be reinforced in a stable state by the reinforcing members. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic cross-sectional view illustrating an existing building whose frame structure has been reinforced by a reinforcing connection structure for existing frame members according to a preferred embodiment of the present invention. [Figure 2] 3 is an enlarged cross-sectional view of part A in FIG. 1 taken along CC in FIG. 3, illustrating a reinforcing connection portion structure for an existing frame member according to a preferred embodiment of the present invention. [Figure 3] 1 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] 2 is an enlarged cross-sectional view of part A in FIG. 1 taken along the line DD in FIG. [Figure 5] FIG. 4 is an enlarged view of part E in FIG. 3. [Figure 6] 10 is a schematic front view illustrating a frame structure reinforced by a reinforcing connection portion structure of an existing frame member according to another preferred embodiment of the present invention. FIG. [Figure 7] 7 is an enlarged cross-sectional view taken along the line EE in FIG. 6, illustrating the structure of a reinforcing connection portion for an existing frame member according to another preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] A connection structure 10 for reinforcing an existing frame member according to a preferred embodiment of the present invention is adopted as a connection structure for connecting a reinforcing member 20 to a steel frame member 52 forming the frame structure 51 without welding, so that the frame structure 51 forming the building 50 can be effectively reinforced by the reinforcing member 20 made of, for example, a frame material, with the aim of preserving an aging steel mill building 50, such as an existing building completed around 1900 as shown in Figure 1, preferably for the long term as a historical heritage.

[0017] In this embodiment, the framework structure 51 of the existing building, an aging steelworks building 50, is formed by assembling lattice structural materials, each of which consists of parallel-arranged chord members 53 and web members (lattice members) 54 arranged in a zigzag pattern between the chord members 53, as steel framework members 52 forming the columns. Steel shape-retaining plate frame members 55 (see Figures 2 and 3) are attached to the lattice structural members 52 forming the framework structure 51 as a single unit by riveting, and are arranged in a rectangular shape to surround the chord members 53, at predetermined positions spaced apart in the vertical direction. The reinforcing connection structure 10 of this embodiment is adopted as a reinforcing connection structure in which the portion of the lattice structural material 52 that forms the framework structure 51 to which the shape-retaining plate frame member 55 is attached by rivet joints is used as the connecting portion 56, and as shown in Figures 2 and 4, the connecting metal fittings 11 to which the frame material 20, which is a reinforcing member, is joined can be attached without welding without generating stress due to tightening force.

[0018] The reinforcing connection structure 10 for existing frame members of this embodiment is a reinforcing connection structure employed when connecting reinforcing members, preferably frame members 20, to existing steel frame members 52, for example, made of lattice structural materials, which form the frame structure 51 of an existing building, such as an aging steelworks building 50 shown in FIG. 1, to reinforce the frame structure 51. As shown in FIGS. 2 to 4, the structure includes a rectangular ring-shaped frame 12 having connecting hardware 11 for connecting the reinforcing members 20 attached to the steel frame members 52, protruding outward from the side surface 12a, and a cement-based solidification material 17 filled and solidified inside the rectangular ring-shaped frame 12 so as to encircle the steel frame members 52 at the connecting portion 56. The connecting hardware 11 is integrally joined to the side surface 12a of the rectangular ring-shaped frame 12 in advance, such as in a factory, prior to construction at the construction site. At the construction site, the rectangular ring frame metal fittings 12 and cement-based solidification material 17 are installed without welding and fixed around the steel frame members 52 at the connecting portions 56, and the reinforcing members 20 are connected to the connecting metal fittings 11 of the rectangular ring frame metal fittings 12 without welding, and the reinforcing members 20 are joined integrally to the steel frame members 52, thereby reinforcing the frame structure 51 made of the steel frame members 52.

[0019] In this embodiment, the connecting metal member 11 attached so as to protrude from the side surface portion 12a of the rectangular annular frame metal member 12 is a gusset plate with bolt fastening holes formed in advance.

[0020] In this embodiment, the lattice structural material, which is a steel frame member 52 that forms a frame structure 51 of a building 50 that is an existing building, uses, for example, four channel steels as chord members 53 (see FIG. 2). These four channel steels are installed in a state where each pair of channel steels is arranged back to back with a gap between them, and is arranged so that they stand upright in parallel on both sides of the center of the lattice structural material 52. Furthermore, each pair of channel steels installed on both sides of the center of the lattice structural material (lattice column) 52 are integrated via web members (lattice members) 54 (see FIGS. 3 and 4) that are joined diagonally in a zigzag pattern so as to connect them, thereby forming a lattice column made of the lattice structural material, which is the steel frame member 52.

[0021] Furthermore, to the lattice column made of lattice structural members 52, steel shape-retaining plate frame members 55 are attached, preferably by rivets, at predetermined positions at predetermined intervals in the vertical direction. The shape-retaining plate frame members 55 are arranged in a rectangular shape surrounding four channel steel chord members 53, preventing the four channel steel members from shifting position and positioning them so that they can work together to efficiently exert the desired strength. Furthermore, multiple rivet heads 57 protrude from the outer periphery of the shape-retaining plate frame member 55. In this embodiment, the portion of the lattice column made of lattice structural members 52 to which the shape-retaining plate frame members 55 are attached serves as a connecting portion 56, and is connected to the frame member 20, which is a reinforcing member, via the reinforcing connecting portion structure 10, thereby effectively reinforcing the frame structure 51 of the building 50 without welding.

[0022] In this embodiment, the frame material 20, which is a reinforcing member connected to the connecting portion 56 of the lattice column made of the lattice structural member 52 via the reinforcing connector structure 10, is stably installed in an area adjacent to the lattice column made of the lattice structural member 52 in the building 50 by assembling it from the floor of the building 50 preferably using square steel pipes (see FIG. 2) without welding via bolt joints or the like, as shown in FIG. 1. The frame material 20 is assembled so that a pair of vertical support frames 20a (see FIG. 1) arranged at the tip of the portion of the frame material 20 that extends laterally toward the lattice column 52 are arranged on both sides of the connecting portion 56 to which the shape-retaining plate frame member 55 is attached of the lattice column made of the lattice structural member 52 (see FIGS. 2 and 4). Each vertical support frame 20a is integrally fixed with a frame-side connecting metal 20b, which protrudes laterally from the surface facing the shape-retaining plate frame member 55 and has bolt fastening holes formed therein. The frame-side connecting metal 20b is connected, preferably by bolting without welding, to the connecting metal 11 of a rectangular ring-shaped frame metal 12 (described later) that constitutes the reinforcing connecting portion structure 10 and is installed in a rectangular shape surrounding the periphery of the connecting portion 56 of the frame members 20 in the lattice structural member 52.

[0023] As shown in FIGS. 2 to 4, the rectangular annular frame metal 12 constituting the reinforcing connection structure 10 of this embodiment includes a pair of first frame metals 13 arranged on one opposing side (the short side in this embodiment) and a pair of second frame metals 14 arranged on the other opposing side (the long side in this embodiment). The first frame metals 13 are made of, for example, channel steel, and their flat plate portions 13a are arranged parallel to each other with a gap between them, and are attached with their upper and lower protruding ribs 13b protruding outward (see FIG. 3). The second frame metal 14 has a horizontally elongated U-shaped upper surface, with joint plates 14b bent vertically at both longitudinal ends of a horizontally elongated rectangular steel plate 14a. The second frame metal 14 is attached to the space between the pair of first frame metals 13, arranged parallel to each other with a gap between them (see FIG. 2). On the outer surface of the steel plate 14a of each second frame metal 14 opposite the side from which the joint plate 14b protrudes, this outer surface serves as the side portion 12a of the rectangular annular frame metal 12, and a connecting metal 11 to the frame material, which is the reinforcing member 20, is previously joined as a single unit in a factory or the like to the center of this. The connecting metal 11 is attached so as to protrude laterally, perpendicular to the steel plate 14a of the second frame metal 14, and preferably has a rectangular planar shape, with bolt fastening holes formed therein.

[0024] In this embodiment, bolt fastening holes are also formed in the joint plate 14b of the second frame metal 14, and by matching these with bolt fastening holes formed in corresponding locations in the flat portion 13a of the first frame metal 13 and fastening, for example, bolt and nut members 15, the pair of first frame metals 13 and the pair of second frame metals 14 can be assembled together to form the rectangular annular frame metal 12.

[0025] In this way, the work of assembling the first frame metal 13 and the second frame metal 14 and installing the rectangular ring frame metal 12 around the shape-retaining plate frame member 55, which is the connecting portion 56 of the reinforcing member 20 in the lattice structural material 52, involves, for example, joining the connecting metal members 11 to the frame-side connecting metal members 20b of the vertical support frames 20a of the frame material 20, which are arranged on both sides of the connecting portion 56, using bolt and nut members 15 without welding, thereby attaching the pair of second frame metals 14 so that they are supported by the vertical support frames 20a and the frame-side connecting metal members 20b (see Figure 4). Thereafter, the flat plate portions 13a of the first frame metal 13 are joined to the joint plates 14b of the second frame metal 14 using bolt and nut members 15 without welding, thereby attaching the pair of first frame metals 13 so that they are supported by the second frame metal 14. This allows the rectangular annular frame metal 12 to be assembled and fixed without welding around the periphery of the shape-retaining plate frame member 55, which is the connecting portion 56 (see FIG. 2).

[0026] In this embodiment, the bottom plate 16 can be supported by the lower protruding rib portions 13b of the pair of first frame metal members 13 in the rectangular ring frame metal member 12 assembled around the periphery of the connecting portion 56, and positioned so as to cover from below the filling space for the cement-based solidification material 17 between the shape-retaining plate frame member 55 and the rectangular ring frame metal member 12, and attached using, for example, a known fixing metal member (not shown). This makes it possible to use the attached bottom plate 16 as a bottom formwork when filling the cement-based solidification material 17 inside the rectangular ring frame metal member 12 (see FIGS. 3 and 4).

[0027] In this embodiment, multiple rivet heads 57 protrude from the surface of the shape-retaining plate frame member 55, which is the connecting portion 56 of the reinforcing members 20 in the lattice structural material 52 (see FIGS. 2 and 3). The rectangular annular frame metal 12 is preferably installed around the entire periphery of the shape-retaining plate frame member 55 of the lattice structural material 52, which is the connecting portion 56 of the reinforcing members 20, with a distance S from the outer surface of the shape-retaining plate frame member 55 preferably at least 1.5 times the protruding height H of the rivet heads 57 (see FIG. 5). This ensures the filling of the cement-based solidification material 17 and prevents cross-sectional defects around the rivets, thereby maintaining reinforcing strength. The cement-based solidification material 17 fills and solidifies in the gap between the shape-retaining plate frame member 55, which is the connecting portion 56 of the reinforcing members 20 in the lattice structural material 52, and the rectangular annular frame metal 12 arranged around it.

[0028] For example, various types of concrete or mortar can be used as the cement-based solidification material 17, which fills the gap between the shape-retaining plate frame member 55 and the rectangular ring frame metal 12 as a filling space. From the viewpoints of improving workability when filling the gap between the shape-retaining plate frame member 55 and the rectangular ring frame metal 12 and improving the quality after solidification, it is preferable to use various known non-shrinkage mortars as the cement-based solidification material 17.

[0029] The cementitious solidification material 17, such as non-shrinkage mortar, is filled without welding into the gap between the shape-retaining plate frame member 55 and the rectangular ring frame metal 12, for example, by manual labor, wrapping the shape-retaining plate frame member 55 around the rectangular ring frame metal 12, and then solidifies, allowing the material to be easily fixed around the steel frame member 52 of the connecting portion 56. Furthermore, as the filled cementitious solidification material 17 solidifies, the frame member 20 is connected to the connecting metal 11 of the rectangular ring frame metal 12, forming the reinforcing connection structure 10 for existing frame members of this embodiment, which can reinforce the frame structure 51. In this embodiment, as described above, the reinforcing member made of the frame member 20 is preferably already connected to the connecting metal 11 by bolting without welding when the rectangular ring frame metal 12 is installed around the periphery of the shape-retaining plate frame member 55, which is the connecting portion 56.

[0030] 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 that connect the reinforcing members made of the frame members 20 to the existing lattice structural members 52 that form the frame structure 51 of the existing building 50 can be attached to the connecting parts 56 of the frame members 20 without welding, without generating stress due to tightening force, making it possible to reinforce the frame structure 51 of the existing building 50 in a stable state with the frame members 20.

[0031] 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 previously joined, which is installed surrounding the periphery of the connecting portion 56 of the frame material 20 in the lattice structural material 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 previously joined around the steel frame member 52, preferably via the frame material 20 and the connecting metal fittings 11, without welding, at the construction site. Furthermore, the rectangular ring frame metal fittings 12 are firmly and integrally joined to the connecting portion 56 of the shape-retaining plate frame member 55 of the lattice structural material 52 via the cement-based solidification material 17 that has been filled inside and solidified, without causing stress due to tightening force to the lattice structural material 52.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 lattice structural material 52 at the connecting portion 56, making it possible to stably reinforce the frame structure 51 of an existing building 50 with the frame material 20 via the rectangular ring frame metal fittings 12 and the cement-based solidification material 17.

[0032] In the reinforcing connection structure 10 of this embodiment, as shown in FIG. 5 , multiple rivet heads 57 protrude from the surface of the connecting portion 56 where the framing members 20 are connected by the shape-retaining plate frame members 55 that constitute the lattice structural member 52. This allows these rivet heads 57 to effectively exert bearing resistance when a shear force acts between the shape-retaining plate frame member 55, which is filled with the cement-based solidification material 17, and the rectangular ring frame metal 12. This also improves the bond strength, more firmly joining the rectangular ring frame metal 12 to the lattice structural member 52 at the connecting portion 56 where the shape-retaining plate frame member 55 connects the framing members 20. This allows the frame structure 51 of the existing building 50 to be more stably and effectively reinforced by the framing members 20. From the viewpoint of improving this bond strength, it is preferable to provide multiple protrusions 58 on the inner surface of the rectangular ring frame metal 12 as well.

[0033] 6 and 7 illustrate a reinforcing joint structure 30 for an existing frame member according to another preferred embodiment of the present invention. In the reinforcing joint structure 30 of this other embodiment, the existing frame structure 32 to be reinforced by the reinforcing member 31 is a frame structure made up of a plurality of beams 33 arranged in a lattice pattern, spaced apart in the vertical direction and extending laterally, and a plurality of columns 34, for example, H-shaped steel, spaced apart in the horizontal direction and extending vertically. The reinforcing members 31 are brace members, for example, angle irons, arranged to extend diagonally from the lattice portion.

[0034] That is, the reinforcing connection structure 30 for existing frame members of this other embodiment is configured to include, as steel frame members, H-shaped steel columns 34 which, together with beams 33, form a frame structure 32, rectangular ring frame metal 36 installed at the upper and lower ends of these columns 34, which are the connecting portions of the brace members 31, surrounding the periphery of the columns 34 in a rectangular shape, with connecting metal members 35 for the brace members 31 attached so as to protrude outward from the side, and cement-based solidification material 37 filled inside the rectangular ring frame metal 36 and solidified so as to envelop the columns 34 at the upper and lower ends, which are the connecting portions. The connecting metal members 35 are joined integrally to the side surfaces of the rectangular ring frame metal 36 in advance, for example, at a factory. At the construction site, rectangular ring frame metal 36 is installed without welding using bolt and nut members 38 and the like and fixed around the column members 34 at the connecting portions, and a cement-based solidification material 37, preferably non-shrink mortar, is filled inside the rectangular ring frame metal 36, for example by hand. Brace members 31 are connected to connecting metal members 35 of rectangular ring frame metal 36 without welding using bolt and nut members 38 and the like, and by joining brace members 31 to column members 34 as a single unit, frame structure 32 made up of beam members 33 and column members 34 is reinforced.

[0035] In addition, in this other embodiment of the reinforcing connection structure 30 for an existing frame member, in order to improve the adhesive strength with the cement-based solidification material 37 that has been filled and solidified inside the rectangular ring frame metal fittings 36, the upper and lower ends of the H-shaped steel that constitutes the column material 34, which are the connecting parts with the brace material 31, are fastened and fixed with multiple bolt and nut members 38 that function as dowel members to the rib portion 34a of the H-shaped steel column material 34.

[0036] In this other embodiment of the reinforcing connection structure 30 for existing frame members, the cement-based solidification material 37 that is filled inside the rectangular ring frame metal 36 and solidifies can firmly join the rectangular ring frame metal 36, to which the connecting metal 35 has been previously attached, to the column material 34 at the connecting portion of the brace material 31 via the cement-based solidification material 37, without causing stress due to the tightening force to the existing column material 34.Therefore, the brace material 31, which is a reinforcing member, is connected without welding to the connecting metal 35 of the rectangular ring frame metal 36 that is joined integrally to the column material 34 at the connecting portion, so that the frame structure 32 of the existing building is reinforced in a stable state by the brace material 31, and the same effect as that of the reinforcing connection structure 10 of the above embodiment is achieved.

[0037] The present invention is not limited to the above-described embodiments and various modifications are possible. For example, the connecting hardware of the rectangular ring frame to which the reinforcing members are connected does not necessarily have to be a gusset plate with pre-formed bolt fastening holes, but may be any of various other known connecting hardware that can connect the reinforcing members without welding. The cement-based solidification material that is filled inside the rectangular ring frame and solidified does not necessarily have to be non-shrink mortar, but may be any of various other cement-based solidification materials such as concrete or cement milk. [Explanation of symbols]

[0038] 10,30 Reinforcement connection structure 11,35 Metal joints 12,36 Rectangular ring frame hardware 12a Side part 13 First frame hardware 13a Flat plate part 13b Protruding rib 14 Second frame hardware 14a Steel Plate 14b Joint plate 15,38 Bolt and nut components 16 Bottom plate 17,37 Cement-based solidification materials 20 Frame material (reinforcement material) 20a Vertical support frame 20b Frame side joint metal 31 Brace material (reinforcement material) 32 Frame structure 33 Beam material 34 Pillar material 34a Rib section 50 Steelworks building (existing building) 51 Frame structure 52 Lattice structural materials (steel frame members, lattice columns) 53 Chord material (channel steel) 54 Belt material (lattice material) 55 Shape-retaining plate frame member 56 Connections of reinforcing members in steel frame members 57 Rivet head 58 Protrusion

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 reinforcing member in the steel frame member, and a connecting metal member with the reinforcing member attached so as to protrude outward from the side portion, 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 member is 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 is supported by the reinforcing members and installed around only the connecting portion of the steel frame member with the reinforcing members, and a cement-based solidification material is filled inside the rectangular ring frame metal and solidified, so that the rectangular ring frame metal is fixed around only the connecting portion of the steel frame member without welding, via only the cement-based solidification material, and the reinforcing members are connected to the connecting metal of the rectangular ring frame metal without welding, so that the reinforcing members are joined integrally to the steel frame member only via the rectangular ring frame metal and the cement-based solidification material, thereby creating a reinforcing connection structure for existing frame members in which the frame structure made of the steel frame members is reinforced while being supported by the reinforcing members without generating stress due to tightening force.

2. 2. A reinforcing joint 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.

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

4. 4. The reinforcing connection structure for an existing frame member according to claim 1, wherein a plurality of rivet heads protrude from the surface of the steel frame member at the connection portion.

5. The rectangular annular frame metal fittings are installed around the steel frame members of the connecting portion, maintaining a distance from the outer peripheral surface of the connecting portion that is at least 1.5 times the protruding height of the rivet heads, and the cement-based solidification material is filled in these gaps and solidified.

6. The steel frame member is made of a lattice structural material, and a rectangular shape-retaining plate frame member is attached by rivets around the connection portion with the reinforcing member of the lattice structural material.

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