JP2013036261A - Joint fitting for column base of wooden building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint fitting for a Rahmen-structured column base in a timber framework method for a wooden building.SOLUTION: A joint fitting for a column and a base of a wooden building includes a lower fitting 1 and an upper fitting 11. The lower fitting 1 having a square box shape includes a base plate 2 at the bottom and a vertical side plate 3 provided with a bolt through-hole 5 at the central portion and a nut 6 inside the plate. The upper fitting 11 is composed of: a fixing plate 13 with a bolt-through hole 15 at the flange face of a lunchbox lid shape with a U-shaped cross section; and an upstanding upper plate 12 including a mandrel 14 composed of plates combined in a cross shape in a planar view and provided with a through-hole 17 for a drift pin at a part of the plates, which is inserted in a slit at the central portion of the web face of the lunchbox lid shape so as to be integrated with the web face. The upper fitting 11 is overlapped on the lower fitting 1, and the side plate 3 and the fixing plate 13 are connected with a bolt 16.

Description

The present invention relates to a column base joint fitting of a frame structure method in a frame structure method of a wooden building.

A conventional frame construction method for a wooden house or the like is a construction method in which a frame is first composed of columns and beams, and walls and floors are attached thereto. There are “through columns” and “tube columns” in the columns, and the structural role of the columns is to support vertical loads in both the through columns and tube columns, resist compressive and tensile forces acting on the outer periphery as load bearing walls, and It is to prevent deformation at the outer wall surface that receives wind pressure (horizontal force).

In recent years, a wooden ramen construction method for residential use has attracted attention, and a garage-integrated house, a store / house, and a general house are required to have a large span and a large opening. In a conventional wooden building, the pillar is generally erected on a foundation laid horizontally on the building foundation. In this configuration, since sufficient strength cannot be obtained at the column base, the frame structure is placed directly on the foundation so that the bending stress of the column base can be transmitted. For example, it is generally performed by the method shown in FIG. That is, a bolt through hole (not shown) provided in the base plate 41 of the column base bracket 40 is inserted into the anchor bolt 42 fixed to the foundation 33 in advance, and the nut 6 is used. Anchor bolts 42 are tightened to fix the column base bracket 40 to the foundation 33. Next, using a heavy machine, the slit 31 formed in the lower end part of the column 30 is inserted into the mounting plate 43 attached to the upper plate of the column base metal 40, and the lower surface of the column is inserted. The drift pin 32 is driven into the drift pin hole 44 formed in the mounting plate 43 by driving the drift pin 32 through the drift pin hole 45, and the mounting plate 43 is coupled to the column 30. The pillar 30 and the foundation 33 are integrated through the metal fitting 40. On the other hand, there is a case where the column base bracket is attached to the lower end of the column in the factory before shipment, but in that case, the base plate bolt attached to the lower end of the column using heavy equipment at the site. An anchor bolt is inserted into the through hole, and the column and the foundation are integrated by fastening with a nut. However, there are cases where the column base metal fittings are modified due to the anchor bolt misalignment correction, and the standby time of heavy machinery becomes longer, and it is rarely implemented for quality control.

Further, in Japanese Patent Laid-Open No. 2002-115339 (first known example), an anchor bolt installed in a foundation is inserted into a bolt insertion hole of a base plate and placed on the foundation, and then screwed into the anchor bolt. It can be fixed to the foundation by tightening the combined nut using a wrench or the like. And after inserting the slit formed in the lower end portion of the column into the mounting plate and supporting the column on the support plate, the lower end portion of the column penetrates from one surface to the other surface orthogonal to the slit. Align the pin insertion hole formed in this way with the pin insertion hole of the mounting plate, and drive the drift pin into the pin insertion hole of the column and the pin insertion hole of the mounting plate, respectively, to join the column to the fixture A method is disclosed.

JP 2002-115339 A

However, the general column base joining method shown in FIG. 7 and the method of enforcing the fixing bracket of the first known example are as follows. After fixing the column base bracket (fixing bracket) with anchor bolts and nuts to the foundation, This is a method of connecting a column base bracket (fixed bracket) and a column using a heavy machine. In other words, when joining a column to a column base bracket (fixing bracket), the width of the groove provided on the bottom end of the column is small on the mounting plate of the column base bracket (fixing bracket) while hanging the column with heavy equipment ( This is a method of fixing the column while inserting the slit 31 (which is slightly larger than the mounting plate), adjusting the entry / exit of the column, and adjusting (vertical) the column, temporarily fixing the column, and driving the drift pin. Therefore, the time required for column construction (assembly) and dimension adjustment varies depending on the skill level of the operator, and the construction accuracy is not stable. Moreover, since the heavy machinery is restrained for a long time, it is an implementation method that is difficult to say as an efficient construction method both in terms of construction period and economically.

The problem to be solved by the present invention is that, in the joint between the foundation and the pillar in the frame construction method of the wooden building, the dimensional adjustment function is high, the workability is excellent, and the economic efficiency is improved. A joining metal fitting is provided.

  As a result of studying the above-mentioned problems, the present inventor has found that the column base bracket is a bowl-shaped lower bracket including a base plate, or a lower portion having a shape in which a square pipe is attached to the base plate. The bracket is divided into a lunch box lid-shaped upper bracket set at the lower end of the column, and the vertical bracket of the lower bracket fixed to the foundation via anchor bolts and the upper bracket attached to the lower end of the column This is a method of connecting the foundation and the pillar by superposing the vertical face plates and joining them with bolts and nuts. The gist is as follows.

(1) A pillar-to-foundation metal fitting in a frame construction method of a wooden building, in which a steel plate piece is bent into a bowl shape, and a plurality of bolt through holes for anchor bolts are formed on a bottom plate that contacts the foundation. The base plate is provided, and at the center of the plate surface extending vertically upward from the four sides of the bottom plate, a bolt through hole and a side plate provided with a nut inside the plate surface are configured. On the lower metal fitting, a steel plate piece is bent, a cross-section is formed into a U-shaped lunch box lid shape, and a mounting plate provided with a bolt through hole at the center of each surface of the lunch box lid-shaped flange surface; A through hole for a drift pin is formed in a part of the upper plate that is upright by combining a plate with a cross in plan view in the center of the lunch box lid-shaped web surface and combining the plates in a cross shape in plan view. A mandrel that is formed is inserted into the slit and formed integrally with the web surface. Upper surface pre - polymerizing an upper bracket which is composed of a preparative, and said side plates, said mounting plate column base metal joint wooden structure, characterized in that it is connected by a bolt.

(2) A base-plate joint in a frame construction method for a wooden building, wherein a base plate is provided with bolt through holes for anchor bolts at diagonal corners of a square steel plate piece; A side plate in which an upright plate having a substantially rectangular shape in plan view is provided near the center of the base plate, and a nut is provided inside the bolt through hole and the plate surface at the center of each of the upright plate surfaces. A steel plate piece is bent to a lower metal fitting formed by the following, and a cross section is formed into a U-shaped lunch box lid shape, and a bolt through hole is formed at the center of each surface of the flange surface of the lunch box lid shape. Drift on the upper part of the plate that is upright by combining the plate in the plan view with a slit in the plan view in the center of the mounting plate provided and the lunch box lid-shaped web surface A mandrel formed with a through hole for a pin is inserted into the slit, and is aligned with the web surface. It turned into the formed top pre - polymerizing an upper bracket which is composed of a preparative, and said side plates, said column base metal joint wooden building, characterized in that the mounting plate is connected by a bolt.

(A) According to the column base fittings of a wooden building according to the present invention, the general method for performing conventional column base fittings is to first mount the column base fittings (fixing fittings) with anchor bolts and nuts. Tighten and fix. Next, using a heavy machine, suspend the column, insert the slit formed in the lower end of the column into the mounting plate of the column base bracket (fixing bracket), and fix the column with a drift pin. is there. The enforcement method of the present invention is an enforcement method in which an upper bracket set on a pillar is superposed on a lower bracket fixed to a foundation using a heavy machine, and is tightened with bolts and nuts. Compared with conventional methods, the work of driving the drift pin in the field is omitted. In addition, by using the same quality steel plate for the lower and upper brackets at the on-site joint, the enforcement accuracy is stabilized, the dimensional adjustment function is enhanced, the use of heavy machinery is significantly reduced, the construction period is shortened, and the economy is reduced. An effect is obtained.

(B) According to the wooden column base joint fittings of the wooden construction according to the present invention, most conventional general column base fittings have been developed as portal type ramen (one-way ramen). . The column base metal fitting of the present invention is a device that considers pure ramen (two-way ramen, X and Y directions), and has extremely high practicality and can provide a high-performance column base joining means.

It is explanatory drawing which shows the 1st Example of the column base joining bracket of the wooden building which concerns on this invention, (a) is a schematic diagram, (b) is a disassembled perspective view of a column base joining bracket. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows 1st Example of the column base joining bracket of the wooden building which concerns on this invention, (a) is a longitudinal cross-sectional view of a column base joining bracket, (b) is a plane sectional view from A direction, ( c) is a plan sectional view from the B direction. It is explanatory drawing which shows the 1st Example of the lower metal fitting which concerns on this invention, (a) is a perspective view of a lower metal fitting, (b) is an expanded view of a lower metal fitting. It is explanatory drawing which shows the Example of the upper metal fitting which concerns on this invention, (a) is a perspective view of an upper metal fitting, (b) is a perspective view of a mandrel, (c) is an expanded view of an upper surface plate. It is explanatory drawing which shows the 2nd Example of the column base joining bracket of the wooden building which concerns on this invention, (a) is a schematic diagram, (b) is a disassembled perspective view of a column base joining bracket. It is a perspective view which shows the 2nd Example of the lower metal fitting which concerns on this invention. It is a schematic diagram which shows an example of the column base joining bracket of the wooden frame structure method of the wooden building which concerns on a prior art.

Hereinafter, based on FIGS. 1-7, the two example embodiments of the column base joining bracket of the wooden building which concern on this invention are demonstrated.
Example 1
1A and 1B are explanatory views showing a first embodiment of a column base fitting for a wooden building according to the present invention, wherein FIG. 1A is a schematic view and FIG. 1B is an exploded perspective view. In this example, the lower bracket 1, the base plate 2, the side plate 3, the bolt through hole 4, the bolt through hole 5, the nut 6, the upper bracket 11, the upper plate 12, and the mounting plate 13 for anchor bolts. , Mandrel 14, battledore plate 14 a, rib 14 b, bolt through hole 15, bolt 16, drift pin hole 17, slit 18, pillar 30, pillar slit 31, drift pin 32, and foundation 33. . Hereinafter, it demonstrates along this.

First, an outline of the column base joint fitting will be described. As shown in FIG. 1, the column base fitting of the present invention is formed by superposing a lower fitting 1 and an upper fitting 11. The upper metal fitting 11 is formed with a size slightly larger than the box-shaped outer shape of the lower metal fitting 1. The joining method is a bolt provided on the side plate 3 of the lower metal fitting 1 by covering the lower metal fitting 1 with the upper metal fitting 11. A method in which the through hole 5 and the bolt through hole 15 provided in the mounting plate 13 of the upper metal fitting 11 are combined, and the bolt 16 inserted and the nut 6 fixed inside the side plate 3 of the lower metal fitting 1 are fastened together. It is.

Next, the lower metal fitting 1 will be described. As shown in FIG. 1, the lower metal fitting 1 has a base plate 2 in which a plurality of bolt through holes 4 for anchor bolts are provided on a bottom plate that is in contact with the foundation 33, and four sides of the base plate 2. It is formed of a side plate 3 provided with a bolt through hole 5 and a nut 6 at the center of a plate bent upright at a right angle. The processing of the lower metal fitting 1 can be assembled by bending from a single steel plate by press working by the plate cutting shown in FIG. For example, first, before the bending process, the steel plate processed into a substantially cross shape is subjected to drilling of the anchor bolt through hole 4 and the bolt through hole 5 at the center of the side plate 3, and then Using AB and CD as fulcrums, bend at right angles so as to face each other. At that time, AC and BD are bent at right angles inward at the same time as fulcrums to form a bowl shape. Subsequently, as shown in FIG. 3A, the center of the nut 6 is aligned with the center of the bolt through hole 5 provided in the side plate 3 from the inside of the bowl shape, and the nut is fixed by welding or the like. Yes. In addition, in order to prevent deformation due to the bending stress of the column base, the vertical portions at both ends (four corners of the bowl shape) of the side plate 3 may be welded.

Next, the upper metal fitting 11 will be described. As shown in FIG. 1, the upper metal fitting 11 is formed by an upper surface plate 12 provided with a mandrel 14 that is mostly built in a column 30 and an attachment plate 13. The inner size of the upper bracket 11 in the shape of the lunch box lid is set to be slightly larger than the outer shape of the bowl shape of the lower bracket 1. With the planing shown in 4 (c), the assembly can be performed by bending a single steel plate by press working. For example, first, before the bending process, a cross-shaped slit 18 is applied to the central portion of the steel sheet processed into a substantially cross shape with a dimension slightly larger than the thickness and width of the mandrel 14, and then, Bolt through holes 15 are drilled in the center of the plate corresponding to the mounting plate 13. After that, it is bent at right angles to the outside with AB and CD as the fulcrum (shape with the U-shaped cross section so that the web is the upper surface). At that time, it is bent outward with AC and BD as the fulcrum. It is formed in a lid shape. In addition, in order to prevent deformation due to bending stress of the column base portion, the vertical portions at both ends (four corners of the lunch box lid shape) of the mounting plate 13 may be welded.

Subsequently, as shown in FIG. 4 (b), a drift pin hole 17 is processed at a predetermined position of the steel plate piece 14a processed into the shape of a battledore, and the lower part of the battledore plate 14a -A rib 14b is provided to intersect the flange 14a to form a mandrel 14. Next, as shown in FIG. 4 (c), the mandrel 14 is inserted into the slit 18 provided in the upper surface plate 12, and at the position shown in FIG. A mandrel 14 is temporarily fixed to 12 and the mandrel 14 and the upper surface plate 12 are fixed by welding. The position of the lower end of the mandrel 14 is set to the position of the upper surface of the contacting base plate 2 so that a part of the force flowing to the column base of the vertical load received by the column can be directly transmitted to the foundation.

The coupling form of the column base joint fitting will be described. As shown in FIG. 1, the lower metal fitting 1 fixed with anchor bolts (not shown) planted on the foundation 33 is covered with the upper metal fitting 11 set on the pillar 30 from above. Next, the bolt through hole 5 provided in the side plate 3 of the lower metal fitting 1 and the bolt through hole 15 provided in the mounting plate 13 of the upper metal fitting 11 are combined, and the bolt 16 is attached from the side. The lower metal fitting 1 and the upper metal fitting 11 are joined by being inserted into the hole, screwed into a nut 6 fixed to the side plate 3 and fastened.

Explain the enforcement method. First, in the factory, as shown in FIG. 1, the mandrel 14 of the upper metal fitting 11 is inserted into the slit 31 provided at the lower end of the column 30, and the drift pin is moved from the column surface orthogonal to the battledore plate 14a. 32 is driven, the battledore plate 14 a is fixed to the column 30, and the upper metal fitting 11 is coupled to the column 30. Next, in the construction site, as shown in FIG. 1, bolt through holes 4 provided in the base plate 2 of the lower metal fitting 1 are fixed to anchor bolts (not shown) fixed to the foundation 33. , And anchor bolts are fastened with nuts 6 to fix the lower metal fitting 1 to the foundation 33. Next, the lower metal fitting 1 fixed to the foundation 33 via anchor bolts is covered with a pillar 30 on which the upper metal fitting 11 is set at the factory from the upper part using a heavy machine. The face plate 3 and the mounting plate 13 of the upper metal fitting 11 overlap. Then, the lower metal fitting 1 and the upper metal fitting 11 are joined by screwing the bolt 16 to the nut 6 fixed to the inner side of the side plate 3 and fastening it with a wrench or the like. That is, in the joining of the foundation and the column, it is possible to provide a column base joint having a high dimensional adjustment function and excellent workability.

The material of the above-mentioned metal fittings has been shown as a general structural rolled steel (SS400) as a representative. However, the present invention is not limited to this, and any known material can be used as long as a functionally satisfactory strength can be obtained. good. For example, a casting, an alcast, etc. can be mentioned. The size of the metal fitting is determined by various conditions at the time of design, but the thickness of the plate is about 4.5 to 9.0 mm, and the width is 150 to 210 mm by combining the lower metal fitting and the upper metal fitting. The degree and height are about 360 to 500 mm.

(Example 2)
FIGS. 5A and 5B are explanatory views showing a second embodiment of the column base fitting for a wooden building according to the present invention, wherein FIG. 5A is a schematic view and FIG. 5B is an exploded perspective view. In this example, a nut 6, an upper metal member 11, an upper surface plate 12, a mounting plate 13, a mandrel 14, a feather plate plate 14a, a rib 14b, a bolt through hole 15, a bolt 16, a hole 17 for a drift pin, and a slit 18 , Lower bracket 21, base plate 22, side plate 23, anchor bolt 24, washer 25, bolt through hole 26 for anchor bolt, bolt through hole 27, pillar 30, pillar slit 31, drift pin 32 , And a base 33. Hereinafter, it demonstrates along this.

First, an outline of the column base joint fitting will be described. As shown in FIG. 5, the column base fitting of the present invention is formed by superposing an upper fitting 11 and a lower fitting 21. The upper metal fitting 11 is formed with a size slightly larger than the box-shaped outer shape of the lower metal fitting 21, and the joining method is a bolt provided on the side plate 23 of the lower metal fitting 21 by covering the lower metal fitting 21 with the upper metal fitting 11. A method in which the through hole 27 and the bolt through hole 15 provided in the mounting plate 13 of the upper metal fitting 11 are combined, and the bolt 16 inserted and the nut 6 fixed inside the side plate 23 of the lower metal fitting 21 are fastened together. It is.

Next, the upper metal fitting 11 will be described. As shown in FIG. 5, the upper metal part 11 is formed by an upper surface plate 12 provided with a mandrel 14 that is mostly built in a column 30 and an attachment plate 13. The inner shape of the upper bracket 11 in the shape of the lunch box lid is set to be slightly larger than the outer shape of the bowl shape of the lower bracket 21. With the planing shown in 4 (c), the assembly can be performed by bending a single steel plate by press working. For example, first, before the bending process, a cross-shaped slit 18 is applied to the central portion of the steel sheet processed into a substantially cross shape with a dimension slightly larger than the thickness and width of the mandrel 14, and then, Bolt through holes 15 are drilled in the center of the plate corresponding to the mounting plate 13. After that, it is bent at right angles to the outside with AB and CD as the fulcrum (shape with the U-shaped cross section so that the web is the upper surface). At that time, it is bent outward with AC and BD as the fulcrum. It is formed in a lid shape. In addition, in order to prevent deformation due to bending stress of the column base portion, the vertical portions at both ends (four corners of the lunch box lid shape) of the mounting plate 13 may be welded.

Subsequently, as shown in FIG. 4 (b), a drift pin hole 17 is processed at a predetermined position of the steel plate piece 14a processed into the shape of a battledore, and the lower part of the battledore plate 14a -A rib 14b is provided to intersect the flange 14a to form a mandrel 14. Next, as shown in FIG. 4C, the mandrel 14 is inserted into the slit 18 provided in the upper surface plate 12. At that time, the position of the lower end of the mandrel 14 is set to the position of the upper surface of the contacting base plate 22 so that a part of the force flowing to the column base of the vertical load received by the column can be directly transmitted to the foundation. . After the mandrel 14 is temporarily fixed, the periphery of the mandrel 14 contacting the top plate 12 is fixed by welding.

Next, the lower metal fitting 21 will be described. As shown in FIG. 5 and FIG. 6, the lower bracket 21 includes a base plate 22 in which a plurality of bolt through holes 26 for anchor bolts are provided in a rectangular steel plate piece that is in contact with the foundation 33, and a base plate. In the center of the plate 22, a side plate 23 is provided with a bolt through hole 27 and a nut 6 provided at the center of a plate surface upright in four directions. As shown in FIG. 6, the lower metal fitting 21 can be assembled with a rectangular steel plate piece and a side plate 23 formed by bending a strip steel plate into an L shape. For example, first, before bending, a plurality of bolt through holes 26 for anchor bolts are formed on a square steel plate piece, and a plurality of bolt through holes 27 are formed on a strip steel plate, and then FIG. As shown in FIG. 4, a side plate 23 in which a strip steel plate is processed into an L shape and a bolt through hole 27 and a nut are provided at predetermined positions on a base plate 22 in which a hole is formed in a square steel plate piece. In this case, welding is performed around the four sides of the installation location and the joint portion (two locations) of the side plate 23.

The coupling form of the column base joint fitting will be described. As shown in FIG. 5, the lower bracket 21 fixed with the anchor bolts 24 planted on the foundation 33 is built from the upper part so as to cover the upper bracket 11 set on the pillar 30. The bolt through hole 27 provided in the side plate 23 of the lower metal fitting 21 and the bolt through hole 15 provided in the mounting plate 13 of the upper metal fitting 11 are aligned, and the bolt 16 is inserted into the hole from the side, The lower metal fitting 21 and the upper metal fitting 11 are joined by screwing and tightening to the nut 6 fixed to the side plate 23. If a large-scale building needs to transmit a large amount of bending or the like, the base plate 22 and the upper metal fitting 11 are in contact with each other and around the lower end of the mounting plate 13. Fillet welding can be performed.

Explain the enforcement method. First, in the factory, as shown in FIG. 5, the mandrel 14 of the upper metal fitting 11 is inserted into the slit 31 provided at the lower end of the column 30, and the drift pin is moved from the column surface orthogonal to the battledore plate 14a. 32 is driven, the battledore plate 14 a is fixed to the column 30, and the upper metal fitting 11 is coupled to the column 30. Next, at the construction site, as shown in FIGS. 5 and 6, anchor bolts through holes for anchor bolts in the base plate 22 of the lower metal fitting 21 are fixed to the anchor bolts 24 fixed to the foundation 33. 26 and the washer 25 are inserted, the anchor bolt 24 is fastened with the nut 6, and the lower bracket 21 is fixed to the foundation 33. Next, the lower metal fitting 21 fixed to the foundation 33 via the anchor bolt 24 is covered with a pillar 30 on which the upper metal fitting 11 is set at the factory from above by using a heavy machine. The side plate 23 and the mounting plate 13 of the upper metal fitting 11 overlap. Then, the lower metal fitting 21 and the upper metal fitting 11 are joined by screwing the bolt 16 to the nut 6 fixed to the inner side of the side plate 23 and tightening it with a wrench or the like. Further, when high strength is required by design, it is possible to fillet weld the lower end of the mounting plate 13 that is in contact with the base plate 22. That is, in the joining of the foundation and the column, it is possible to provide a column base joint having a high dimensional adjustment function, high rigidity, and excellent workability.

The material of the above-mentioned metal fittings has been shown as a general structural rolled steel (SS400) as a representative. However, the present invention is not limited to this, and any known material can be used as long as a functionally satisfactory strength can be obtained. good. For example, a casting etc. can be mentioned. The size of the metal fitting is determined by various conditions at the time of design, but the thickness of the plate is about 6.0 to 16.0 mm, and the width is 200 to 400 mm by combining the lower metal fitting and the upper metal fitting. The height is about 400 to 800 mm.

As described above, according to the present invention of the column base joint of a wooden building, at the joint between the foundation and the column in the ramen construction method, the dimensional adjustment function is high, the workability is excellent, and the economical. The present invention provides a joint for a column base. It is also possible to contribute to the current situation where large-scale wooden technology is not systematized, and the utility to society in the housing and construction industries is extremely large.

DESCRIPTION OF SYMBOLS 1 Lower metal fitting 2 Base plate 3 Side plate 4 Bolt through-hole 5 for anchor bolts Bolt through-hole 6 Nut 11 Upper metal fitting 12 Upper surface plate 13 Mounting plate 14 Mandrel 14a Blind plate plate 14b Rib 15 Bolt penetration Hole 16 Bolt 17 Hole 18 for Drift Pin Slit 21 Lower Bracket 22 Base Plate 23 Side Plate 24 Anchor Bolt 25 Washer 26 Anchor Bolt Bolt Through Hole 27 Bolt Through Hole 30 Pillar 31 Pillar Slit 32 Drift Pin 33 Foundation 40 Conventional column base bracket 41 Base plate 42 Anchor bolt 43 Conventional mounting plate 44 Drift pin hole 45 Drift pin hole

Claims (2)

A pillar-to-foundation metal fitting in a frame construction method for a wooden building, in which a steel plate piece is bent into a bowl shape, and a bottom plate contacting the foundation is provided with a plurality of bolt through holes for anchor bolts. -In the lower bracket composed of a plate and a side plate provided with nuts on the inner side of the plate surface at the center portion of the plate surface extending vertically upward from the four sides of the bottom plate. A bent plate with a cross-section formed into a U-shaped lunch box lid shape, a mounting plate provided with a bolt through hole at the center of each surface of the flange surface of the lunch box lid shape, and the lunch box In the center of the lid-shaped web surface, a slit in the shape of a plan view is provided, and a plate in the shape of a cross in the shape of a plan view is combined to form a through hole for a drift pin in the upper part of the plate. The inserted mandrel is inserted into the slit and formed integrally with the web surface. Pre - polymerizing an upper bracket which is composed of a preparative, and said side plates, said mounting plate column base metal joint wooden structure, characterized in that it is connected by a bolt. A base-to-base joint fitting in a frame construction method of a wooden building, wherein a base plate is provided with anchor bolt bolt through holes at diagonal corners of a square steel plate piece, and the base -An upright plate having a substantially rectangular shape in plan view is provided in the vicinity of the center of the spray plate, and includes a bolt through hole and a side plate provided with a nut inside the plate surface at the center of each of the upright plate surfaces. The lower metal fitting is bent to form a U-shaped lunch box cover with a cross-section, and a bolt through hole is provided in the center of each flange face of the lunch box cover In the center of the plate and the lunch box lid-shaped web surface, a slit in the shape of a plan view is provided, and a portion of the plate upright by combining the plates in a shape of a cross in plan view is used for the drift pin. A mandrel formed with a through hole is inserted into the slit and integrated with the web surface. It made the top pre - polymerizing an upper bracket which is composed of a preparative, and said side plates, said mounting plate column base metal joint wooden structure, characterized in that it is connected by a bolt.

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