JP3077715U - Pillar hardware - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a pillar base metal used when erecting a pillar on a base so that the pillar can be firmly fixed on the base without obstructing mounting of a brace, a wall, or the like. . Also,
A joint hardware capable of firmly connecting a girder or a beam to a column is provided. SOLUTION: A square pipe 11 is placed horizontally between an upper surface of a base 2 and a lower end surface of a column 3, and an upper surface portion 11a of the square pipe 11 and a large-diameter bolt 15 screwed into the column 3 are attached to a mounting bolt 16. By fixing the lower surface 11c and the base 2 with the anchor bolts 12 and the nuts 13, the base 2 and the column 3 can be firmly fixed without disturbing the attachment such as bracing. On the other hand, the first and second large-diameter bolts 42, 42, 43, 43 screwed into the lower-floor column 5, the spar 6, and the upper-floor column 7 respectively are provided with metal plates 41, 41, 41, 4.
By combining 1, the lower-floor column 5, the spar 6, and the upper-floor column 7 can be firmly fixed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to column base hardware and joint hardware.

[0002]

[Prior art]

 At conventional construction sites, hold-down hardware is installed based on structural calculations at locations where pull-out forces are generated so that columns and bases do not deviate due to vertical external forces such as earthquake pitching. On the other hand, external forces in the horizontal direction, such as an earthquake roll or a typhoon, are dealt with by walls and braces.However, in order to maximize the forces of the walls and braces, the forces are concentrated. The column bases are also reinforced with hole-down hardware.

[0003]

[Problems to be solved by the invention]

 However, since the hole-down hardware as described above is exposed on the side surfaces of the column pedestal and the upper surface of the base, the hole-down hardware may interfere when attaching braces or walls.

[0004] An object of the present invention is to make it possible to firmly fix a pillar on a base without disturbing attachment of a brace, a wall, or the like, in a column base metal fitting used when erecting a pillar on the base. . Another object of the present invention is to provide a joint fitting capable of firmly connecting a girder or a beam to a column.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the invention according to claim 1 is, for example, as shown in FIG. 1, a column base metal fitting 1 used when a column 3 is built on a base 2, wherein the upper surface of the base 2 and the column A square pipe 11 having mounting holes 11b and 11d in upper and lower surfaces 11a and 11c, an anchor bolt 12 protruding above the base 2, and a lower end surface of the column 3. A large-diameter bolt 15 having a screw hole 15b which is screwed into the lower end face and has an opening at a lower end face; And a mounting bolt 16 screwed into the screw hole 15b of the large-diameter bolt 15 from the mounting hole 11b on the upper surface 11a of the square pipe 11.

According to the first aspect of the present invention, a nut is attached to an anchor bolt protruding into the square pipe from the mounting hole on the lower surface, and the square pipe is fixed to the base. Since the mounting bolt is screwed into the screw hole of the large-diameter bolt to fix the pillar to the square pipe, the pillar and the base can be fixed without obstructing when attaching braces or walls, as with conventional hole-down hardware. Can be fixed firmly.

The invention according to claim 2 is, for example, as shown in FIG. 8, a joint fitting 4 used for connecting a beam 6 or a beam to columns 5, 7. A front part 41a having an attachment hole 41e in contact therewith, an end part 41b having an attachment hole 41d in contact with the upper or lower surface of the beam 6 or the beam, and both side parts 41c continuous with the end part 41b and the front part 41a. A metal plate 41, a first large-diameter bolt 42 having a screw hole 42a which is screwed from the lower surface or upper surface of the beam 6 or the beam and opened at least on one side, and a side surface which is screwed from the side surface of the columns 5, 7 A second large-diameter bolt 43 having screw holes 43a, 43a that are open to the inside, and screwed into the screw holes 42a of the first large-diameter bolt 42 from the mounting holes 41d of the end face portion 41b of the metal plate 41. First And a second mounting bolt 45 screwed into the screw hole 43a of the second large-diameter bolt 43 from the mounting hole 41e of the front portion 41a of the metal plate 41. It is characterized by.

According to the invention of claim 2, the end face of the metal plate is in contact with the upper or lower surface of the beam or beam, and the first mounting bolt is attached to the beam or beam through the mounting hole in the end face of the metal plate. Screw the metal plate into the girder or beam by screwing it into the screw hole of the screwed first large-diameter bolt, and abut the front of the metal plate against the side of the pillar. By screwing the second mounting bolt into the screw hole of the second large-diameter bolt screwed into the column and connecting the metal plate to the column, the girder or beam can be firmly connected to the column.

According to the invention of claim 3, for example, as shown in FIG. 8, the first and second metal plates 41 have four screw holes 42a, 42a, 43a, 43a opened at both end surfaces. 2 large-diameter bolts 42 and 43 each, and the first and second mounting bolts 44 and 45 each using four bolts. With the lower ends of the columns 7 mounted, the two first large-diameter bolts 42, 42 are screwed into the spar 6, while the second large-diameter bolts 43, 43 are mounted on the upper and lower columns 5, 7, respectively. The metal plates 41, 41, 41, 41 are respectively provided at four places on both sides of the columns 5, 7 on the upper and lower floors on the upper and lower surfaces of the spar 6, and the upper and lower metal plates 41, , 41, 41, 41 are connected to the mounting holes 41d, 41d of the end face portions 41b, 41b, 41b, 41b. , 41d, 41d, screw the first mounting bolts 44, 44, 44, 44 into the screw holes 42a, 42a, 42a, 42a of the first large-diameter bolts 42, 42, respectively. The metal plates 41, 41, 41, 41 on both sides of the pillars 5, 7 on the upper and lower floors are separated from the mounting holes 41e, 41e, 41e, 41e of the front portions 41a, 41a, 41a, 41a by the second method. The second mounting bolts 45, 45, 45, 45 are screwed into the screw holes 43a, 43a, 43a, 43a of the large diameter bolts 43, 43, respectively, and are connected to each other.

According to the present invention, the first mounting bolts are screwed into the screw holes of the first large-diameter bolts in the girders sandwiched between the mounting holes in the upper and lower metal plate end faces. The upper and lower metal plates are joined to the girder, and the second mounting bolts are respectively screwed into the screw holes of the second large-diameter bolts in the columns on the upper and lower floors sandwiched between the mounting holes on the front portions of the metal plates on both sides. By connecting the metal plates on both sides to the columns on the upper and lower floors, the columns on the lower floor and the girders can be firmly connected to the columns on the upper floor.

[0011]

[Embodiment of the invention]

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

First Embodiment A column base 1 according to the present embodiment connects a base 2 and a column 3 as shown in FIG. 1 and FIG. The pillar base 1 includes a square pipe 11 interposed between the upper surface of the base 2 and the lower end surface of the pillar 3, an anchor bolt 12 protruding into the square pipe 11, and an anchor bolt 12. The nut 13 and the washer 14 (see FIGS. 7A and 7B) for coupling the square pipe 11, the large-diameter bolt 15 screwed from the lower end surface of the column 3, the large-diameter bolt 15 and the square pipe 11 And mounting bolts 16 for coupling.

As shown in FIGS. 3 to 6, the upper surface 11 a of the square pipe 11 is provided with a mounting hole 11 b through which the mounting bolt 16 is inserted. The lower surface 11c is provided with a mounting hole 11d through which the anchor bolt 12 is inserted with a margin.

The large-diameter bolt 15 has an external thread portion 15 a for connecting the outer periphery to the column 3. The large-diameter bolt 15 screwed from the lower end surface of the column 3 is provided with a screw hole 15b opened on the lower end surface.

Next, a method of constructing the base 2 and the columns 3 using the column base hardware 1 will be described. First, a hole is made in the center of the lower end surface of the pillar 3, and a large-diameter bolt 15 is screwed into the hole in advance. Then, the column 3 is fixed to the square pipe 11 by screwing the mounting bolt 16 from the mounting hole 11b of the upper surface 11a of the square pipe 11 into the screw hole 15b of the large diameter bolt 15. Then, an anchor bolt 12 protruding from the upper surface of the base 2 is inserted into a mounting hole 11d provided in a lower surface portion 11c of the square pipe 11 coupled to the lower end surface of the column 3, and the column 3 is inserted through the square pipe 11. And place it on the base 2. Then, the square pipe 11 is fixed to the base 2 by attaching a nut 13 and a washer 14 to an anchor bolt 12 protruding into the square pipe 11 from the mounting hole 11d of the lower surface portion 11c of the square pipe 11.

According to the above embodiment, the following effects can be obtained. (1) The mounting bolt 16 is screwed into the screw hole 15b of the large-diameter bolt 15 from the mounting hole 11b of the upper surface 11a of the square pipe 11 to fix the column 3 to the square pipe 11, and the lower surface 11c of the square pipe 11 is mounted. A nut 13 and a washer 14 are attached to an anchor bolt 12 protruding into the square pipe 11 from the hole 11d, and the square pipe 11 is fixed to the base 2, so that the hole down exposed on the side surface of the pillar 3 and the upper surface of the base 2 is provided. Compared with hardware, the pillars 3 and the base 2 can be firmly fixed without obstructing the installation of braces and walls. (2) The lower surface 11c of the square pipe 11 is provided with a mounting hole 11d through which the anchor bolt 12 can be inserted with a margin, thereby facilitating the positioning when the column 3 is mounted on the base 2. Also, fine adjustment of the position of the pillar 3 after the placement is possible.

[Second Embodiment] As shown in FIGS. 8 to 10, this embodiment is applied to a case where a lower floor column 5, a spar 6, and an upper floor column 7 are connected. It is a joint hardware 4. The metal fittings 4 are made of metal plates 41, 41, 41, 41 abutting on the pillar 5 and the spar 6 on the lower floor or the pillar 7 and the spar 6 on the upper floor, and the first large screw screwed from the upper surface of the spar 6. Diameter bolts 42, 42, second large-diameter bolts 43, 43 screwed from the side of the lower floor pillar 5 or the upper floor pillar 7, metal plates 41, 41, 41, 41 and the first large bolt. The first mounting bolts 44, 44, 44, 44 for connecting the diameter bolts 42, 42, and the second mounting for connecting the metal plates 41, 41, 41, 41 and the second large diameter bolts 43, 43 Bolts 45, 45, 45, 45.

The metal plate 41 includes a front portion 41 a that is in contact with the side surface of the lower floor column 5 or the upper floor column 7, an end surface portion 41 b that is in contact with the upper surface or lower surface of the spar 6, A side surface portion 41c is provided on both sides of the end surface portion 41b and the front surface portion 41a. The end face portion 41b is provided with a mounting hole 41d through which the mounting bolt 44 is inserted, and the front face portion 41a is provided with a mounting hole 41e through which the mounting bolt 45 is inserted.

As shown in FIG. 11, the first large-diameter bolt 42 and the second large-diameter bolt 43 are the same as those of the first embodiment except that screw holes 42a and 43a are opened on both sides. This is a component having male screw portions 42b and 43b similar to the diameter bolt 15.

Next, a method of constructing the lower-floor column 5, the girder 6, and the upper-floor column 7 using the joint fitting 4 will be described. First, the first large-diameter bolts 42, 42 are screwed into predetermined positions of the spar 6 in advance, and the second large-diameter bolts 43 are also mounted at predetermined positions of the lower-floor pillar 5 and the upper-floor pillar 7. After being screwed in, respectively, the pillar 5 on the lower floor, the spar 6, and the pillar 7 on the upper floor are assembled. Then, on the lower side of the spar 6, two metal plates 41, 41 are arranged on both side surfaces of the lower pillar 5 and the lower surface of the spar 6. The front portions 41a, 41a of the metal plates 41, 41 are in contact with the side surfaces of the pillar 5 on the lower floor, and the end surfaces 41b, 41b are in contact with the lower surface of the spar 6. Then, the first mounting bolts 44, 44 are screwed into the screw holes 42a, 42a of the first large-diameter bolt 42 in the spar 6 sandwiched between the mounting holes 41d, 41d of the end face portions 41b, 41b, respectively. 6, the metal plates 41, 41 are connected to the mounting holes 41e, 41e of the front portions 41a, 41a, and the screw holes 43a, 43a of the second large-diameter bolt 43 in the lower floor pillar 5 sandwiched therebetween. Then, the second mounting bolts 45, 45 are respectively screwed, and the metal plates 41, 41 are connected to the pillar 5 on the lower floor side. On the other hand, the upper part of the girder 6 is symmetrical to the lower structure with the girder 6 interposed therebetween, and the construction method is the same as that of the lower side.

According to the above embodiment, the following effects can be obtained. (1) The first large-diameter bolt 42 in the spar 6 sandwiched between the mounting holes 41d, 41d, 41d, 41d of the end faces 41b, 41b, 41b, 41b of the metal plates 41, 41, 41, 41, The first mounting bolts 44, 44, 44, 44 are screwed into the 42 screw holes 42a, 42a, 42a, 42a, respectively, and the metal plates 41, 41, 41, 41 are joined to the beam 6, and the front part 41a, Screw holes 43a of the second large-diameter bolts 43, 43 in the lower pillar 5 and the upper pillar 7 sandwiched between the mounting holes 41e, 41e, 41e, 41e of 41a, 41a, 41a. , 43a, 43a, 43a are screwed with second mounting bolts 45, 45, 45, 45, respectively, and the metal plates 41, 41, 41, 41 are connected to the lower pillar 5 and the upper pillar 7, respectively. According to the lower floor pillar 5 and girder 6 and upper floor And the pillar 7 can be firmly bonded.

In the above embodiment, the columns and the beams on the upper and lower floors are connected, but the present invention is not limited to this. For example, only the columns and the beams may be connected. good. In addition, the materials and specific shapes of the column base metal fittings and the joint metal fittings are arbitrary, and it goes without saying that the concrete detailed structure and the like can be appropriately changed.

[0023]

[Effect of the invention]

 According to the first aspect of the present invention, unlike the conventional hole-down hardware, the pillar and the base can be firmly fixed without being obstructed when attaching a brace, a wall, or the like.

According to the second aspect of the present invention, the girder or the beam and the column can be firmly connected.

According to the third aspect of the present invention, the lower-floor pillar, the girder, and the upper-floor pillar can be firmly connected.

[Submission date] January 12, 2001 (2001.1.12)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents] [Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to column base hardware.

[0002]

[Prior art]

 At conventional construction sites, hold-down hardware is installed based on structural calculations at locations where pull-out forces are generated so that columns and bases do not deviate due to vertical external forces such as earthquake pitching. On the other hand, external forces in the horizontal direction, such as an earthquake roll or a typhoon, are dealt with by walls and braces.However, in order to maximize the forces of the walls and braces, the forces are concentrated. The column bases are also reinforced with hole-down hardware.

[0003]

[Problems to be solved by the invention]

 However, since the hole-down hardware as described above is exposed on the side surfaces of the column pedestal and the upper surface of the base, the hole-down hardware may interfere when attaching braces or walls.

[0004] An object of the present invention is to make it possible to firmly fix a pillar on a base without disturbing attachment of a brace, a wall, or the like, in a column base metal fitting used when erecting a pillar on the base. .

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention relates to a column base metal fitting 1 used when erecting a pillar 3 on a base 2, as shown in FIG. 1, for example, the upper surface of the base 2 and the lower end surface of the column 3. A square pipe 11 having mounting holes 11b and 11d in the upper and lower surfaces 11a and 11c, an anchor bolt 12 protruding above the base 2, and screwed in from the lower end surface of the column 3. A large-diameter bolt 15 having a screw hole 15b which is opened at the lower end face thereof, and a nut 13 attached to the anchor bolt 12 which projects into the square pipe 11 from the attachment hole 11d of the lower surface 11c of the square pipe 11. And a mounting bolt 16 which is screwed from the mounting hole 11b on the upper surface 11a of the square pipe 11 into the screw hole 15b of the large diameter bolt 15.

According to the present invention, a nut is attached to an anchor bolt projecting into the square pipe from the mounting hole on the lower surface, and the square pipe is fixed to the base. The mounting bolt is screwed into the screw hole of the diameter bolt to fix the pillar to the square pipe, so that the pillar and the base are firmly fixed without obstructing when attaching braces or walls, as with conventional hole-down hardware it can.

[0007]

[Embodiment of the invention]

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

As shown in FIGS. 1 and 2, a column base metal fitting 1 according to an embodiment connects a base 2 and a column 3. The pillar base 1 includes a square pipe 11 interposed between the upper surface of the base 2 and the lower end face of the pillar 3, an anchor bolt 12 projecting into the inside of the square pipe 11, The nut 13 and the washer 14 (see FIGS. 7A and 7B) for connecting the pipe 11, the large-diameter bolt 15 screwed from the lower end surface of the column 3, the large-diameter bolt 15 and the square pipe 11 And mounting bolts 16 for coupling.

As shown in FIGS. 3 to 6, the upper surface 11 a of the square pipe 11 is provided with a mounting hole 11 b through which the mounting bolt 16 is inserted. The lower surface 11c is provided with a mounting hole 11d through which the anchor bolt 12 is inserted with a margin.

The large-diameter bolt 15 has a male screw portion 15 a so that its outer periphery is connected to the column 3. The large-diameter bolt 15 screwed from the lower end surface of the column 3 is provided with a screw hole 15b opened on the lower end surface.

Next, a method of constructing the base 2 and the columns 3 using the column base hardware 1 will be described. First, a hole is made in the center of the lower end surface of the pillar 3, and a large-diameter bolt 15 is screwed into the hole in advance. Then, the column 3 is fixed to the square pipe 11 by screwing the mounting bolt 16 from the mounting hole 11b of the upper surface 11a of the square pipe 11 into the screw hole 15b of the large diameter bolt 15. Then, an anchor bolt 12 protruding from the upper surface of the base 2 is inserted into a mounting hole 11d provided in a lower surface portion 11c of the square pipe 11 coupled to the lower end surface of the column 3, and the column 3 is inserted through the square pipe 11. And place it on the base 2. Then, the square pipe 11 is fixed to the base 2 by attaching a nut 13 and a washer 14 to an anchor bolt 12 protruding into the square pipe 11 from the mounting hole 11d of the lower surface portion 11c of the square pipe 11.

According to the above embodiment, the following effects can be obtained. (1) The mounting bolt 16 is screwed into the screw hole 15b of the large-diameter bolt 15 from the mounting hole 11b of the upper surface 11a of the square pipe 11 to fix the column 3 to the square pipe 11, and the lower surface 11c of the square pipe 11 is mounted. A nut 13 and a washer 14 are attached to an anchor bolt 12 protruding into the square pipe 11 from the hole 11d, and the square pipe 11 is fixed to the base 2, so that the hole down exposed on the side surface of the pillar 3 and the upper surface of the base 2 is provided. Compared with hardware, the pillars 3 and the base 2 can be firmly fixed without obstructing the installation of braces and walls. (2) The lower surface 11c of the square pipe 11 is provided with a mounting hole 11d through which the anchor bolt 12 can be inserted with a margin, thereby facilitating the positioning when the column 3 is mounted on the base 2. Also, fine adjustment of the position of the pillar 3 after the placement is possible.

The material and the specific shape of the column base metal are also arbitrary, and it goes without saying that the specific detailed structure and the like can be appropriately changed.

[0014]

[Effect of the invention]

 According to the present invention, unlike the conventional hole-down hardware, the pillar and the base can be firmly fixed without being obstructed when attaching a brace or a wall.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Deleted

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Deleted

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Deleted

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Deleted

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment to which a column base metal according to the present invention is applied, showing an assembled state of a column base metal, a column, and a base.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a plan view showing a square pipe which is a component of the column base metal according to the first embodiment.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is a cross-sectional view taken along a line DD of FIG. 5;

FIGS. 7A and 7B are a plan view (a) and a front view (b) showing a washer which is a component part of the column base metal according to the first embodiment.

FIG. 8 is a side view showing a second embodiment to which the joint hardware of the present invention is applied, and showing an assembled state of the joint hardware, the upper and lower floor columns and the girder.

FIG. 9 is a front view showing a second embodiment to which the joint hardware of the present invention is applied, showing an assembled state of the joint hardware, the columns and the beams of the upper and lower floors.

FIG. 10 is a plan view showing a second embodiment to which the joint hardware of the present invention is applied, showing an assembled state of the joint hardware, columns and spar of upper and lower floors.

FIG. 11 is a front view showing first and second large-diameter bolts that are components of a fitting in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column base metal 11 Square pipe 11a Upper surface part 11b Mounting hole 11c Lower surface 11d Mounting hole 12 Anchor bolt 13 Nut 14 Washer 15 Large diameter bolt 15a Male screw part 15b Screw hole 16 Mounting bolt 2 Base 3 Column 4 Joint metal 41 Metal plate 41a Front part 41b End face part 41c Side part 41d, 41e Mounting hole 42 First large diameter bolt 42a Screw hole 42b Male screw part 43 Second large diameter bolt 43a Screw hole 43b Male screw part 44 First mounting bolt 45 Second mounting Bolts 5 Pillars on the lower floor 6 Digits 7 Pillars on the upper floor

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[Procedure amendment]

[Submission Date] January 12, 2001 (2001.1.1)
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Name of device] Pillar hardware

[Utility model registration claims]

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment to which a column base metal according to the present invention is applied, showing an assembled state of a column base metal, a column, and a base.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a plan view showing a square pipe which is a component of the column base hardware in the embodiment.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is a cross-sectional view taken along a line DD of FIG. 5;

FIGS. 7A and 7B are a plan view and a front view, respectively, showing a washer which is a component of the column base metal according to the embodiment.

[Description of Signs] 1 Pillar base 11 Square pipe 11a Upper surface 11b Mounting hole 11c Lower surface 11d Mounting hole 12 Anchor bolt 13 Nut 14 Washer 15 Large diameter bolt 15a Male thread 15b Screw hole 16 Mounting bolt 2 Base 3 Column

Claims (3)

[Utility model registration claims] Claims 1. A pillar base metal used for erecting a pillar on a base, comprising a square pipe interposed between a top surface of the base and a lower end surface of the pillar and having mounting holes on upper and lower surfaces. An anchor bolt protruding on a base; a large-diameter bolt having a screw hole which is screwed from a lower end surface of a column and opened to a lower end surface; and wherein the protrusion protrudes into the square pipe from the mounting hole on a lower surface of the square pipe. A column base fitting, comprising: a nut mounted on an anchor bolt; and a mounting bolt screwed into the screw hole of the large diameter bolt from the mounting hole on the upper surface of the square pipe. 2. A joint fitting used for connecting a girder or a beam to a column, the fitting being in contact with a side surface of the column and having a mounting hole and an upper surface or a lower surface of a girder or a beam. An end face having a hole, a metal plate having both side faces continuous with the end face and the front face, and a first large-diameter bolt having a screw hole which is screwed from a lower surface or an upper surface of a girder or a beam and opened at least on one surface; A second large-diameter bolt having a screw hole that is screwed in from the side surface of the pillar and opens to the side surface; and a screw hole that is screwed into the screw hole of the first large-diameter bolt from the mounting hole in the end surface portion of the metal plate. A fitting metal comprising: a first mounting bolt; and a second mounting bolt screwed into the screw hole of the second large-diameter bolt from the mounting hole in the front portion of the metal plate. 3. The four metal plates, two first and second large-diameter bolts having the screw holes opened at both end surfaces, and four first and second mounting bolts. Using the first large-diameter bolts screwed into the girder while the lower end of the upper-floor column is placed with the girder sandwiched between the upper ends of the lower-floor columns, 2 large-diameter bolts are screwed in, and the metal plates are respectively provided at four positions on both sides of the upper and lower columns on the upper and lower surfaces of the girder. The first mounting bolts are screwed into the screw holes of the first large-diameter bolts from the holes to be coupled to each other, and the metal plates on both sides of the upper and lower floor columns are connected to the mounting holes in the front part. The second mounting bolt is screwed into the screw hole of the second large-diameter bolt, respectively. 3. The fitting according to claim 2, wherein the fittings are joined together.