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 installed so as to surround a connection part 51a 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 from a surface of a steel frame member 51 of the connection part 51a. 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 51 of the connection part 51a 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 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 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] 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 brace materials to existing steel frame members that form the frame structure of an existing building, thereby allowing the frame structure of an existing building to be reinforced in a stable state by 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. The reinforcing connection structure comprises a rectangular ring frame metal fitting 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 attached so as to protrude from the surface of the steel frame member at the connecting portion, and a plurality of stud members attached so as to protrude from the surface of the steel frame member at the connecting portion, which are filled inside the rectangular ring frame metal fitting and solidified so as to encase the steel frame member at the connecting portion. 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.

[0009] 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 or a rivet member fixed via a fixing hole drilled in the steel frame member at the connecting portion.

[0010] In addition, in the reinforcing connection structure of an existing frame member of the present invention, it is preferable that the steel frame member is made of H-shaped steel or I-shaped steel, and the stud member is a bolt member fastened and fixed in a fixing hole drilled by a drill in the rib portion of these steel materials.

[0011] Furthermore, in the reinforcing connection structure for existing frame members of the present invention, it is preferable that the metal joint is a gusset plate with bolt fastening holes formed in advance.

[0012] 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. [Effects of the Invention]

[0013] 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 parts of the reinforcing members 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]

[0014] [Figure 1] 1 is a schematic front view illustrating a frame structure reinforced using a reinforcing connection portion structure for an existing frame member according to a first 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 connecting portion for an existing frame member according to the first preferred embodiment of the present invention. FIG. [Figure 3] 3 is a cross-sectional view taken along the line BB in FIG. 2, illustrating the structure of a reinforcing connection portion for an existing frame member according to a first preferred embodiment of the present invention. FIG. [Figure 4] 1A and 1B are enlarged views of part A in FIG. 1 and a cross-sectional view taken along CC in FIG. 1A, respectively, illustrating other forms of reinforcing connecting portion structures. [Figure 5] 10 is a schematic side view illustrating a frame structure reinforced using a reinforcing connection portion structure of an existing frame member according to a second embodiment. FIG. [Figure 6] 5A is an enlarged view of part D in FIG. 5, and FIG. 5B is a cross-sectional view taken along the line EE in FIG. 5A. [Figure 7] 10(a) is a schematic side view illustrating a frame structure reinforced using another form of reinforcing joint structure, and FIG. 10(b) is an enlarged cross-sectional view of part G along FF in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] The first preferred embodiment of the present invention relates to a connecting structure 10 for reinforcing existing frame members. The connecting structure 10 is preferably used as a connecting structure for connecting reinforcing members 20, preferably steel frame members forming the frame structure 50, to the columns 51 without welding, so that the frame structure 50 can be effectively reinforced, for example, as a frame structure 50 of an existing dilapidated building, which is made of a plurality of columns 51 arranged in a lattice pattern, spaced apart horizontally and extending vertically, and a plurality of beams 52 arranged at intervals vertically and extending horizontally, as shown in FIG. 1, using reinforcing members 20, for example, made of brace material.

[0016] In this first embodiment, a frame structure 50 of an existing, dilapidated building is formed by assembling preferably H-shaped steel beams 53 as steel frame members forming columns 51. In the reinforcing connection structure 10 of this embodiment, a portion of the columns 51 made of H-shaped steel beams 53 forming the frame structure 50, adjacent to a joint 54 with a beam 52, serves as a connecting portion 51a to which a brace material (reinforcing member) 20 is connected, and as shown in Figures 2 and 3, a connecting metal member 11 to which the brace material 20 is joined can be attached to this connecting portion 51a without welding, without generating stress due to a tightening force.

[0017] The reinforcing connection structure 10 for existing frame members of this first embodiment is a reinforcing connection structure used when reinforcing a frame structure 50 by connecting a reinforcing member, preferably a brace material 20, to a column 51, which is an existing steel frame member, preferably an H-shaped steel 53, that forms the frame structure 50 of an existing building.As shown in Figures 2 and 3, it is configured to include a rectangular ring-shaped frame metal 12, which is installed in a rectangular shape around the connecting portion 51a of the reinforcing member 20 in the column 51, and has a connecting metal 11 for the reinforcing member 20 attached so as to protrude outward from the side portion 12a, a plurality of stud members 13 attached so as to protrude from the surface of the column 51 at the connecting portion 51a (see Figure 3), and a cement-based solidification material 17 that has been filled inside the rectangular ring-shaped frame metal 12 and solidified, so as to encase the column 51 at the connecting portion 51a. The connecting metal fittings 11 are joined as a single unit to the side portions 12a of the rectangular ring frame metal fittings 12 in a factory or the like before construction at the construction site. At the construction site, the rectangular ring frame metal fittings 12 and the cement-based solidification material 17 are installed without welding and fixed around the column materials 51 at the connecting portions 51a, and the brace materials 20 are connected to the connecting metal fittings 11 of the rectangular ring frame metal fittings 12 without welding and joined as a single unit to the column materials 51, thereby reinforcing the frame structure 50 made up of the column materials 51 and the beam materials 52.

[0018] In the first embodiment, the stud members 13 are preferably bolt members or rivet members (bolt members in this embodiment) 18 fixed to the column material 51 made of H-shaped steel 53 at the connecting portion 51a via fixing holes formed by drilling. The connecting metal members 11 attached so as to protrude from the side portion 12a of the rectangular annular frame metal member 12 are preferably gusset plates with bolt fastening holes formed in advance.

[0019] In this first embodiment, columns 51, which are steel frame members made of H-shaped steel beams 53 that form a frame structure 50 of an existing aging building, are installed in parallel with each other at predetermined intervals in the horizontal direction and extend vertically, as shown in Fig. 1. The columns 51 are assembled in a lattice pattern together with a plurality of beams 52 that are installed in parallel with each other at predetermined center-to-center intervals in the vertical direction and extend horizontally, thereby forming the existing frame structure 50. The beams 52 are preferably steel frame members made of I-shaped steel beams 55. The reinforcing connection structure 10 of this first embodiment is configured so that the frame structure 50 can be effectively reinforced by a pair of brace materials 20, which are reinforcing members preferably made of angle irons 56, arranged diagonally across inside the rectangular lattice frame of the frame structure 50 made up of such column materials 51 and beam materials 52.The connecting metal fittings 11 for connecting the ends of the brace materials 20 to the column materials 51 without welding and joining them as a single unit can be fixed stably to the connecting portions 51a of the brace materials 20 on the column materials 51 without welding.

[0020] In addition, in the first embodiment, a pair of brace materials 20, which are reinforcing members, are arranged diagonally crossing each other inside the rectangular lattice frame of the frame structure 50. The brace materials 20, which are reinforcing members, are connected to the column material 51 via the reinforcing connector structure 10 of this embodiment, with the portion of the column material 51 close to the joint 54 with the beam material 52 as the connecting portion 51a, so that the frame structure 50 can be effectively reinforced without welding.

[0021] 2 and 3, the rectangular annular frame metal 12 constituting the reinforcing connection structure 10 of the first embodiment is formed to include a pair of first frame metals 14 arranged on one opposing side and a pair of second frame metals 15 arranged on the other opposing side. Each of the pair of first frame metals 14 is made of, for example, channel steel, and their flat plate portions 14a are arranged parallel to each other with a gap between them, and are attached with overhanging ribs 14b protruding outward from both side edges of each flat plate portion 14a (see FIG. 3). A plurality of bolt fastening holes are formed in the overhanging ribs 14b.

[0022] Furthermore, on the outer surface of the flat plate portion 14a of each first frame metal member 14 on the side where the protruding rib portion 14b protrudes, this outer surface serves as the side surface portion 12a of the rectangular annular frame metal member 12, and a connecting metal member 11 for the brace material 20, preferably a gusset plate, is attached to the center of the width direction of this side surface so as to protrude vertically from the flat plate portion 14a along a plane parallel to the protruding rib portion 14b. The connecting metal member 11 made of a gusset plate is integrally joined to the flat plate portion 14a of the first frame metal member 14 in a factory or the like before being transported to the construction site. In this embodiment, the gusset plate 11 has a vertical width similar to that of the flat plate portion 14a at the base end joined to the flat plate portion 14a of the first frame metal member 14, and has a generally triangular side shape with a truncated tip, with the vertical width gradually decreasing in the diagonal direction of the lattice frame. The gusset plate 11 is provided with a plurality of bolt fastening holes arranged along the diagonal direction of the lattice frame.

[0023] Each of the pair of second frame metal pieces 15 is made of, for example, a steel plate and has a vertical width similar to that of the flat plate portion 14a of the first frame metal piece 14, and a horizontal width spanning the projecting rib portions 14b of the pair of spaced-apart first frame metal pieces 14. A plurality of bolt fastening holes are formed in the side edge portions on both sides of each second frame metal piece 15 at positions corresponding to the plurality of bolt fastening holes formed in the projecting rib portions 14b of the first frame metal piece 14.

[0024] The pair of first frame metal fittings 14 and the pair of second frame metal fittings 15 are installed in a rectangular shape around the connecting portion 51a of the reinforcing member 20 in the column material 51. That is, the pair of first frame metal fittings 14 can be assembled with the flat plate portions 14a arranged parallel to, for example, a pair of flange portions 53a of the H-shaped steel 53 constituting the column material 51, with a gap of preferably 50 mm or less between the flat plate portions 14a and the flange portions 53a. The pair of second frame metal fittings 15 can be assembled with the side edge portions on both sides, where bolt fastening holes are formed, overlapping from the outside with the protruding rib portions 14b, where bolt fastening holes are formed, of the pair of first frame metal fittings 14, respectively. A pair of first frame metal fittings 14 and a pair of second frame metal fittings 15 are assembled in a rectangular shape around the connecting portion 51a of the reinforcing member 20 in the pillar material 51. By aligning the bolt fastening holes in the side edge portions of the overlapping second frame metal fittings 15 with the bolt fastening holes in the protruding rib portion 14b of the first frame metal fittings 14 and tightening the fixing bolts 16, these come together to form a rectangular annular frame metal fitting 12, which is installed in a rectangular shape around the connecting portion 51a of the reinforcing member 20 in the pillar material 51, and has connecting metal fittings 11 to the reinforcing member 20 attached so as to protrude outward from the side portion 12a.

[0025] In the first embodiment, the rectangular ring frame metal fitting 12, which is made up of a pair of first frame metal fittings 14 and a pair of second frame metal fittings 15, can be assembled above a floor slab 57 (see FIG. 2) placed on and attached to the lower beam 52 as a base (see FIG. 3) at a connecting portion 51a of the column 51 adjacent to a joint 54 between the column 51 and the lower beam 52, for example, as shown in FIG. 1. Also, at the connecting portion 51a of the column 51 adjacent to a joint 54 between the column 51 and the upper beam 52, the rectangular ring frame metal fitting 12 can be assembled above the base in an inverted state, upside down from the upright state shown in FIG. 3, using a base plate (not shown) supported by the column 51 and attached without welding using various known fixing hardware. The floor slab 57 or base plate that serves as the base of the rectangular ring frame metal fitting 12 can be used as the bottom formwork for the rectangular ring frame metal fitting 12 when filling the inside of the rectangular ring frame metal fitting 12 with cement-based solidification material 17.

[0026] In the first embodiment, the multiple stud members 13 attached to the brace member 20 so as to protrude from the surface of the column member 51 at the connecting portion 51a are, as described above, multiple bolt members 18 fixed to the column member 51 made of H-shaped steel 53 at the connecting portion 51a via fixing holes drilled with a drill. The stud members 13 made of bolt members 18 can be easily attached by fastening the bolt members 18 to each of the multiple fixing holes drilled without welding, preferably in the rib portion 53b of the H-shaped steel 53 at the connecting portion 51a, for example, using a known drill. This also makes it possible to easily attach the multiple stud members 13 made of bolt members 19 so as to protrude from the surface of the rib portion 53b, with the surface of the rib portion 53b serving as the surface of the connecting portion 51a of the column member 51. The work of attaching the stud member 13 to the rib portion 53b of the H-shaped steel 53 of the connecting portion 51a using the bolt member 18 can preferably be carried out prior to the work of assembling a pair of first frame metal members 14 and a pair of second frame metal members 15 around the H-shaped steel 53 of the connecting portion 51a to attach the rectangular annular frame metal member 12.

[0027] As the cement-based solidification material 17 that is filled and solidified inside the rectangular ring frame metal 12 attached around the H-shaped steel 53 at the connecting portion 51a as described above, various types of concrete or mortar can be used, for example. 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.

[0028] The cement-based solidification material 17, such as non-shrinkage mortar, is filled without welding and without gaps, for example, by manually wrapping the H-shaped steel 53 of the connecting portion 51a inside the rectangular ring frame metal 12, and then solidifies, allowing the material to be easily fixed around the connecting portion 51a of the brace material 20 in the column material 51 made of the H-shaped steel 53. Furthermore, as the filled cement-based solidification material 17 solidifies, the rectangular ring frame metal 12 is also fixed integrally around the connecting portion 51a of the brace material 20 in the column material 51 made of the H-shaped steel 53. This forms the reinforcing connection structure 10 for existing frame members of the first embodiment, which can reinforce the frame structure 50 by connecting the brace material 20 to the connecting metal 11 of the rectangular ring frame metal 12.

[0029] In the first embodiment, the reinforcing member made of the brace material 20 is easily connected to the connecting hardware 11 of the rectangular ring frame metal 12 that constitutes the reinforcing connection structure 10 at the construction site by aligning the bolt fastening holes formed at the end of the brace material 20 with the bolt fastening holes formed in the gusset plate 11 and fastening the fixing bolts 16. This makes it possible to easily join the brace material 20 to the connecting hardware 11 of the rectangular ring frame metal 12 without welding. This makes it possible to easily join preferably a pair of brace materials 20, in a crossed state, integrally with the column material 51 inside the rectangular lattice frame of the frame structure 50, and the frame structure 50 made of the column material 51 and the beam material 52 is effectively reinforced by the brace material 20.

[0030] Furthermore, according to the reinforcing connection structure 10 for existing frame members of this first embodiment having the above-mentioned configuration, the connecting hardware 11, which connects the reinforcing member made of the brace material 20 to the column material 51 that forms the frame structure 50 of the existing building, can be attached to the connecting portion 51a of the brace material 20 without welding, without generating stress due to tightening force, making it possible to reinforce the frame structure 50 of the existing building in a stable state with the brace material 20.

[0031] That is, according to the first embodiment, the reinforcing connection structure 10 is configured to include a rectangular ring frame metal 12 to which connecting metal members 11 are previously joined, which is installed around the periphery of the connecting portion 51a of the brace material 20 in the column material 51 made of H-shaped steel 53, 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 members 11 are previously joined around the column material 51, 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 51a of the brace material 20 in the column material 51 via the cement-based solidification material 17, without causing stress due to tightening force to the column material 51, due to the cement-based solidification material 17 that has been filled inside the rectangular ring frame metal fittings 12 and hardened.Therefore, the brace 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 51 at the connecting parts 51a, making it possible to stably and firmly reinforce the frame structure 50 of an existing building with the brace material 20 via the rectangular ring frame metal fittings 12 and the cement-based solidification material 17.

[0032] Furthermore, in the reinforcing connection structure 10 of this embodiment, multiple stud members 13 are provided by bolt members 18, protruding from the surface of the rib portion 53b of the H-shaped steel 53, which is the surface of the column material 51 at the connecting portion 51a. This allows these stud members 13 to effectively exert bearing resistance via the cement-based solidification material 17 when a shear force acts between the rectangular ring frame metal 12, the interior of which is filled with cement-based solidification material 17, and the column material 51 at the connecting portion 51a. This also improves the bond strength of the cement-based solidification material 17, more firmly joining the rectangular ring frame metal 12 to the H-shaped steel 53 at the connecting portion 51a of the column material 51 to which the brace material 20 is connected. This allows the brace material 20 to more effectively reinforce the framework structure 50 of an existing building in a more stable state. From the perspective of improving this bond strength, it is preferable to provide multiple protrusions on the inner surface of the rectangular ring frame metal 12, for example.

[0033] Furthermore, in this embodiment, the multiple stud members 13 made of bolt members 18 are installed by drilling fixing holes in the rib portion 53b of the H-shaped steel 53 that constitutes the column material 51, and then fastening the bolt members 18 to the fixing holes formed in the rib portion 53b.This means that there is no need to form fixing holes in the flange portion 53a of the H-shaped steel 53, which mainly bears the stress, and this would cause cross-sectional defects, and it is possible to reinforce the frame structure 50 using the column material 51 made of H-shaped steel 53 in an even more stable state with the brace material 20.

[0034] 4(a) and 4(b) illustrate another example of a reinforcement connection structure 10'. In the reinforcement connection structure 10' shown in FIGS. 4(a) and 4(b), a pair of first frame metal pieces 14' and a pair of second frame metal pieces 15' that form a rectangular ring-shaped frame metal piece 12' are both made of channel steel. The first frame metal piece 14', to which a gusset plate 11' is pre-joined as a connecting metal piece, is attached in surface contact with the flange portion 53a of the H-shaped steel 53 that constitutes the column material 51, without any gaps. The second frame metal piece 15' is attached in abutting contact with the end of the flange portion 53a of the H-shaped steel 53. The cement-based solidification material 17' is filled and solidified only in the area inside the rectangular ring-shaped frame metal piece 12', surrounded by the flange portion 53a and rib portion 53b of the H-shaped steel 53 and the second frame metal piece 15'.

[0035] In the other form of reinforcing connection structure 10' shown in Figures 4(a) and (b), the rectangular annular frame metal member 12' equipped with the gusset plate 11' is firmly joined as a single unit to the connecting portion 51a of the brace material 20 in the column material 51 via the cement-based solidification material 17' without causing stress in the column material 51 due to the tightening force, and a stud member 13 is attached by a bolt member 18 protruding from the surface of the column material 51 at the connecting portion 51a, thereby achieving the same effect as the above-mentioned reinforcing connection structure 10.

[0036] 5 and 6(a) and (b) show a reinforcing connection structure 30 for an existing frame member according to a second embodiment of the present invention. The reinforcing connection structure 30 of the second embodiment is adopted as a connection structure for connecting frame members 31 to column members 58, which are steel frame members that form the frame structure, without welding, so that column members 58 made of H-shaped steel 59 that form the frame structure of, for example, an existing aging building can be effectively reinforced with reinforcing members 31, preferably made of frame members.

[0037] In the second embodiment, the frame material 31, which is a reinforcing member, is installed in a stable state by being assembled from the floor surface of an existing building. The frame material 31 has horizontal frames 31a that extend laterally toward the columns 58 made of H-shaped steel 59 to be reinforced. The ends of the horizontal frames 31a that make up the frame material 31 are connected by bolt members 34 without welding to gusset plates 33, which are connecting metal fittings that are previously joined to rectangular ring-shaped frame metal fittings 32 that make up the reinforcing connection structure 30. This allows the framework structure using the columns 58 to be reinforced in a stable state.

[0038] In the reinforcing connection structure 30 of the second embodiment, a rectangular ring frame metal 32 is installed in a rectangular shape around the periphery of the connecting portion 58a of the frame member 31 in the column member 58, which is a steel frame member. The rectangular ring frame metal 32 is formed by assembling a first frame metal 35 made of channel steel and a second frame metal 36 having a U-shaped cross-section. A rectangular gusset plate 33, which serves as a connecting metal for the frame member 31, is attached to protrude from the outer surface of the second frame metal 36. In addition, a stud member 37 made of a plurality of bolt members is attached to protrude from the surface of the rib portion 59b of the H-shaped steel 59 that forms the column member 58 in the connecting portion 58a. A cement-based solidification material 38 is filled inside the rectangular ring frame metal 32, enveloping the column member 58 of the connecting portion 58a, and has hardened. The gusset plate 33, which is a joining metal piece, is joined integrally to the side surface of the rectangular ring frame metal piece 32 in advance before construction at the construction site.

[0039] In the reinforcing connection structure 30 of this second embodiment, the rectangular annular frame metal member 32 equipped with the gusset plate 33 is firmly joined as a single unit to the connecting portion 58a of the frame material 31 in the pillar material 58 via the cement-based solidification material 38 without causing stress in the pillar material 58 due to the tightening force, and a stud member 37 made of a bolt member is attached protruding from the surface of the pillar material 58 at the connecting portion 58a, thereby achieving the same effects as those of the reinforcing connection structure 10 of the above-mentioned embodiment.

[0040] 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 various other known connecting hardware that can connect reinforcing members such as brace materials and frame materials without welding. In addition to bolt members, the stud members can be provided using various other hardware that can effectively exert bearing resistance via the cement-based solidification material. The cement-based solidification material that is 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 and cement milk.

[0041] 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 H-shaped steel, and may be various other steel frame members such as square steel pipes, as shown in Figures 7(a) and 7(b).

[0042] In Figures 7(a) and (b), the steel frame members are columns 48 made of square steel pipes 47, and the reinforcing members are frame members 49. The rectangular ring frame metal 41 forming the reinforcing connection structure 40 is formed by cutting and welding square steel pipes larger than the square steel pipes 47 forming the column members 48, thereby providing a connecting metal 43. Rivet members 44 protrude from the surface of the connecting portion 48a of the column member 48 made of square steel pipes 47 and the frame member 49. Rivet members 44 are fixed without welding through holes drilled by a drill to form protruding stud members. A plurality of bolt members 45 are attached to the rectangular ring frame metal 41, resulting in protrusions formed by the bolt members 45 protruding from the inner surface. A cement-based solidification material 46 is filled and solidified inside the rectangular ring frame metal 41, enveloping the column members 48 of the connecting portion 48a. These components form the reinforcing connection structure 40. The frame material 49 is connected to the joining metal fittings 43 of the rectangular ring-shaped frame metal fittings 41 of the formed reinforcing connection structure 40 without welding, so that the framework structure using the pillar materials 48 can be effectively reinforced. [Explanation of symbols]

[0043] 10,10',30,40 Reinforcement connection structure 11, 11', 33, 43 Gusset plate (joint metal) 12, 32, 41 Rectangular ring frame hardware 12a Side part 13,37 Stud member 14,14',35 First frame hardware 14a Flat plate part 14b Protruding rib 15, 36 Second frame hardware 16 Fixing bolt 17, 17', 38, 46 Cement-based solidification material 18, 19, 34, 45 Bolt members 20 Brace material (reinforcement material) 31,49 Frame material (reinforcement member) 31a Horizontal frame 44 Rivet component (stud component) 47 Square steel pipe (steel frame member) 50 Frame structure 51, 48, 58 Columns (steel frame members) 51a,48a,58a Connecting part 52 Beams (steel frame members) 53,59 H-beam (steel frame member) 53a, 59a flange 53b, 59b Rib section 54 Joint with beam 55 I-beam (steel frame member) 56 Angle iron (reinforcement member) 57 Floor slab

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 in which connecting metal members with the reinforcing member are attached so as to protrude outward from the side portion, a plurality of stud members attached so as to protrude from the surface of the steel frame member at the connecting 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 at the connecting portion, and the connecting metal members are joined integrally to the side portion of the rectangular ring-shaped frame metal member 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 steel frame members are made of H-shaped steel or I-shaped steel, and the stud members are bolt members or rivet members fixed via fixing holes drilled by a drill in the rib portions of the H-shaped steel or I-shaped steel at the connecting portions, thereby forming a reinforcing connection structure for existing frame members.

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.

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