JP2024148262A - Wooden column base structure - Google Patents

Abstract

To simplify a constitution, to improve workability in erection, and to properly resist horizontal force by suppressing bending deformation of a plate part when the horizontal force acts on a wooden column in an earthquake or the like while excellently good securing pull-out resistance of an anchor bolt.SOLUTION: A wooden column base structure in which a wooden column 2x is installed on a foundation 41 using a column base hardware 31, wherein the column base hardware 31 includes a plate part 31A disposed on the foundation 41 and an insertion part 31B inserted into the wooden column 2x, in the plate part 31A, anchor bolts 33 are fixed to both ends of the horizontal force resistance direction X, and an insertion part 31B is disposed at an intermediate part of the horizontal force resistance direction X, and the insertion part 31B and the anchor bolt 33 are arranged in line with the horizontal force resistance direction X, the plate part 31A is provided with a rib plate 31D extending in the horizontal force resistance direction X and resisting bending deformation of the plate part 31A.SELECTED DRAWING: Figure 5

Description

The present invention relates to a base structure for a wooden column, and in particular to a base structure for a wooden column in which a wooden column is installed on a foundation using a base metal fitting.

This type of wooden column base structure is widely used to install a wooden column on a foundation using a column base metal fitting that has a box shape with a rib plate between horizontal upper and lower plate parts of approximately the same size (see, for example, Figures 1 and 2 of Patent Document 1 and Figures 1 and 2 of Patent Document 2).

In this wooden column base structure, the lower plate of the column base hardware is placed on the foundation, and an anchor bolt fixed to the foundation is fixed to the lower plate, thereby fixing the column base hardware to the foundation. Also, a wooden column is placed on the upper surface of the upper plate of the column base hardware, and an insertion part such as a gusset plate or lag screw extending upward from the upper plate is inserted into the wooden column, thereby fixing the wooden column to the column base hardware.
However, in Patent Document 1, in addition to the lower plate portion, an upper plate portion must also be provided, and since there are many plate portions constituting the column base hardware, there is a problem that the manufacturing work, such as welding, is laborious. In addition, when erecting, the anchor bolt fixed to the lower plate of the column base hardware is easily blocked from the worker's line of sight by the upper plate and the wooden column fixed thereto, and as a result, the anchor bolt becomes difficult to see during work, and workability is reduced. Moreover, since the upper side of the anchor bolt is blocked by the upper plate portion, etc., it is difficult to perform work such as fastening the anchor bolt, and this also causes a problem of workability being reduced.

Therefore, a wooden column base structure has been proposed in which a wooden column is installed on a foundation using a column base metal fitting whose main component is a single horizontal plate portion that is placed on the foundation (see Figure 4 of Patent Document 2).

JP 2001-107456 A JP 2008-255627 A

The column base hardware shown in Figure 4 of Patent Document 2 comprises a plate portion that is placed on the foundation and an insertion portion that extends upward from the plate portion and is inserted into the wooden column. The plate portion has an outward extension portion that extends outward beyond the installation portion of the wooden column, and an anchor bolt that is fixed to the foundation is fixed to the outward extension portion.
Therefore, fewer plates are required to make up the column base hardware, and the construction can be simplified by reducing the amount of work required for manufacturing, such as welding. Furthermore, since the anchor bolt is fixed to the outward extension portion that extends outward from the installation portion of the wooden column, the anchor bolt is easily visible during erection, improving workability.

In addition, the plate portion of this column base hardware has anchor bolts fixed to both ends in the horizontal force resistance direction in which the wooden column resists horizontal force, and an insertion portion is arranged in the middle portion in the horizontal force resistance direction, with the insertion portion and the anchor bolt arranged so that they are aligned in the horizontal force resistance direction.
Therefore, while the horizontal force acting on the wooden pillar acts as a bending stress with its axis of rotation being perpendicular to the horizontal force resistance direction at the middle part of the plate part in the horizontal force resistance direction, the anchor bolts which are subjected to a pull-out force due to the bending stress can be installed at a wide interval between both ends of the plate part along the horizontal force resistance direction, and the pull-out resistance of the anchor bolts can be well secured.
However, since the plate portion is smaller than that of a box-shaped column base metal fitting, the bending strength of the plate portion is lower. As a result, when a horizontal force acts on a wooden column during an earthquake, etc., the plate portion may bend and deform, making it impossible to adequately resist the horizontal force.

In light of this situation, the main objective of the present invention is to provide a wooden column base structure that simplifies the structure, improves ease of construction, and satisfactorily ensures anchor bolt pull-out resistance while suppressing bending deformation of the plate when a horizontal force acts on the wooden column during an earthquake or other event, thereby adequately resisting the horizontal force.

The first characteristic configuration of the present invention is a wooden column base structure in which a wooden column is installed on a foundation using a column base metal fitting,
The column base metal fitting includes a plate portion to be placed on the foundation and an insertion portion extending upward from the plate portion and inserted into the wooden column,
The plate portion has an outward extension portion that extends outward from the installation portion of the wooden post, and an anchor bolt that is fixed to the foundation is fixed to the outward extension portion.
The plate portion has anchor bolts fixed to both ends in a horizontal force resistance direction in which the wooden post resists a horizontal force, and an insertion portion is disposed in an intermediate portion in the horizontal force resistance direction, and the insertion portions and the anchor bolts are arranged in line in the horizontal force resistance direction,
The plate portion is provided with a rib plate extending in the horizontal force resisting direction and resisting bending deformation of the plate portion.

With this configuration, by reducing the number of plate sections that make up the column base hardware, it is possible to simplify the configuration and improve workability during erection, and by setting the anchor bolts at a wide interval between both ends of the plate sections in the horizontal force resistance direction, it is possible to ensure good pull-out resistance of the anchor bolts.
Furthermore, the plate portion that is placed on the foundation is equipped with a rib plate that extends in the horizontal force resistance direction and resists bending deformation of the plate portion. Therefore, when a horizontal force acts on the wooden pillar during an earthquake, etc., the rib plate effectively suppresses bending deformation of the plate portion, thereby appropriately resisting the horizontal force.

A second characteristic configuration of the present invention is that the rib plate is provided in a plurality of spaces in the plate portion in a direction perpendicular to the horizontal force resistance direction,
The multiple rib plates include a first rib plate arranged in an outer portion outside the installation location of the wooden post in the perpendicular direction, and a second rib plate arranged in an intermediate portion overlapping with the installation location of the wooden post in the perpendicular direction.

According to this configuration, the multiple rib plates provided at intervals in the orthogonal direction perpendicular to the horizontal force resistance direction of the plate section include a first plate on the outer side that is outward of the location where the wooden pillar is installed in the orthogonal direction, and a second rib plate in the middle that overlaps with the location where the wooden pillar is installed in the orthogonal direction. This makes it possible to effectively utilize the location where the wooden pillar is installed and provide multiple rib plates distributed throughout the plate section, and more effectively suppresses bending deformation of the plate section when a horizontal force acts on the wooden pillar during an earthquake, etc.

The third characteristic configuration of the present invention is that the wooden column is constructed by laminating a plurality of rectangular cross-section wooden pieces in the orthogonal direction without adhesive,
The second rib plate is disposed at a portion of the plate portion that corresponds to a boundary between the wooden pieces in the orthogonal direction.

According to this configuration, the wooden pillar can be easily constructed as an assembly of individual rectangular cross-section wooden pieces, and the strong axis direction of each of the individual rectangular cross-section wooden pieces can be oriented along the horizontal force resistance direction. Therefore, a large moment of area against a horizontal force in the horizontal force resistance direction can be ensured for each of the individual rectangular cross-section wooden pieces, and the wooden pillar, which is an assembly of those wooden pieces, can be efficiently constructed.
Furthermore, the second rib plate provided at the location on the plate portion where the wooden post is installed is positioned at a location on the plate portion that corresponds to the boundary between the pieces of wood that make up the wooden post in the perpendicular direction, so that the second rib plate is prevented from interfering with the insertion of the insertion portion into the wood, and the insertion portion can be properly inserted into each piece of wood that makes up the wooden post.

A fourth characteristic configuration of the present invention is that the wooden column is configured by laminating a plurality of rectangular cross-section wooden pieces without adhesive in a direction perpendicular to the horizontal force resistance direction in the plate portion,
The insertion portion and the anchor bolt are disposed in each of the individual wood corresponding areas of the plate portion which are divided in the orthogonal direction so as to correspond to each of the plurality of wood pieces constituting the wooden post.

According to this configuration, the wooden column can be easily constructed as an assembly of individual rectangular cross-section wooden pieces, while the strong axis direction of each of the individual rectangular cross-section wooden pieces can be oriented along the horizontal force resistance direction. Therefore, a large moment of area against a horizontal force in the horizontal force resistance direction can be secured for each of the individual rectangular cross-section wooden pieces, and the wooden column, which is an assembly of those wooden pieces, can be efficiently constructed.
Furthermore, the insertion portions and anchor bolts are arranged in each of the individual wood corresponding area portions which are divided in the plate portion in an orthogonal direction to correspond to each of the multiple pieces of wood which make up the wooden column, so that the horizontal force acting on each of the multiple pieces of wood which make up the wooden column can be efficiently transmitted to the foundation via the insertion portions and anchor bolts arranged in each of the individual wood corresponding area portions.

Floor plan of the second floor of a wooden two-way rigid frame structure FIG. 1 shows the II-II shaft assembly diagram. FIG. 1 shows the III-III shaft assembly diagram. Plan view showing beam-column joints (a) is a side view showing a schematic diagram of the column base structure, (b) is a bb cross-sectional view, and (c) is a cc cross-sectional view.

An embodiment of a two-way wooden rigid frame structure using a wooden column base structure of the present invention will be described with reference to the drawings.
As shown in Figures 1, 2, and 3, the wooden two-way rigid frame structure includes a plurality of X-direction rigid frame structures Rx (see Figures 1 and 3) in which wooden X-direction beams 1x extending in the X direction in plan view are semi-rigidly joined to wooden X-direction columns (corresponding to wooden columns) 2x to form a rigid frame structure surface along the X direction, and a plurality of Y-direction rigid frame structures Ry (see Figures 1 and 2) in which wooden Y-direction beams 1y extending in the Y direction intersecting the X direction in plan view are semi-rigidly joined to wooden Y-direction columns 2y (corresponding to wooden columns) to form a rigid frame structure surface along the Y direction. Most of the X-direction rigid frame structures Rx and Y-direction rigid frame structures Ry are structured as structures that have multiple layers of beams and span multiple floors.

In this embodiment, as shown in FIG. 4, the X-direction column 2x is configured as a rectangular cross-sectional column P having a rectangular cross-sectional shape with the X-direction as the strong axis direction (long side direction) and suitable for resisting horizontal forces in the X-direction. The Y-direction column 2y is configured as a rectangular cross-sectional column P (upper right in FIG. 1) having a rectangular cross-sectional shape with the Y-direction as the strong axis direction (long side direction) and suitable for resisting horizontal forces in the Y-direction. As shown in FIG. 1, the X-direction column 2x and the Y-direction column 2y are not only arranged in the X-direction rigid frame frame section Rx and the Y-direction rigid frame frame section Ry, but also in the composite frame section Rf in which the X-direction beam 1x or the Y-direction beam 1y is erected on the X-direction column 2x and the Y-direction column 2y. For example, as shown in FIG. 2 and FIG. 3, the X-direction column 2x and the Y-direction column 2y are configured as so-called column-first joint columns in which the beam is joined to the side of the column, and many are configured as through columns spanning multiple floors.

Then, as will be described in detail later, the Y-direction beams 1y are pin-jointed to the X-direction columns 2x of the X-direction rigid frame frame section Rx and the composite frame section Rf, and the X-direction beams 1x are pin-jointed to the Y-direction columns 2y of the Y-direction rigid frame frame section Ry and the composite frame section Rf. In this way, a plurality of X-direction rigid frame frame sections Rx and a plurality of Y-direction rigid frame frame sections Ry are integrally combined.
As shown by dotted lines in Fig. 1, in order to efficiently supplement the resistance to horizontal forces, Y-direction earthquake-resistant studs (corresponding to wooden columns) 3y, which have a rectangular cross-sectional shape with the Y direction as the strong axis (long side direction) and can effectively resist horizontal forces in the Y direction, and X-direction earthquake-resistant studs (corresponding to wooden columns) 3x, which have a rectangular cross-sectional shape with the X direction as the strong axis (long side direction) and can effectively resist horizontal forces in the X direction, are provided at appropriate locations in this wooden two-way rigid frame structure. Incidentally, the X-direction earthquake-resistant studs 3x and Y-direction earthquake-resistant studs 3y are also constructed as rectangular cross-sectional columns P (see Fig. 4) like the X-direction columns 2x and Y-direction columns 2y, and as described later, are constructed by stacking multiple pieces of wood M having flat rectangular cross sections in the weak axis direction (short side direction) without adhesive and fixing them with fastening means such as bolts and nuts.

Next, the detailed configuration of the columns and beams used in this embodiment and their joint structure (semi-rigid joints and pin joints) will be described with reference to Figure 4. Figure 4 illustrates a case in which the X direction is the horizontal force resistance direction, the X direction beam 1x and the X direction column 2x are semi-rigidly joined, and the Y direction beam 1y is pin-joined to the X direction column 2x. However, the structure is similar when the Y direction is the horizontal force resistance direction, the Y direction beam 1y and the Y direction column 2y are semi-rigidly joined, and the X direction beam 1x is pin-joined to the Y direction column 2y.

A semi-rigid joint is a joint structure that has a higher degree of fixation than a pin joint but a lower degree of fixation than a rigid joint, but is considered to be a rigid joint in structural calculations of the frame. In this embodiment, as shown in FIG. 4, for example, a rod-shaped hollow metal 22 such as Home Connector (registered trademark) is inserted into a through hole 21 formed through the X-direction column 2x and the X-direction beam 1x, and adhesive is filled inside and outside the hollow metal 22 and hardened to semi-rigidly join the X-direction column 2x and the X-direction beam 1x. Note that a deformed steel bar or the like may be used instead of the hollow metal 22 to form a semi-rigid joint, and various joint structures capable of semi-rigid joints may be adopted.

As shown in FIG. 4, the X-direction column 2x is configured as a rectangular cross-section column P with its strong axis direction being the direction (X-direction) along the rigid frame structural face on which it is arranged, and this rectangular cross-section column P is configured by stacking multiple pieces of wood M (three in the illustrated example) with flat rectangular cross sections in its weak axis direction (short side direction, corresponding to the direction perpendicular to the horizontal force resistance direction) without adhesive, and fixing the multiple pieces of wood M with fastening means such as bolts and nuts. Also, the X-direction beam 1x corresponds to the X-direction column 2x, and is configured by stacking multiple pieces of wood M (three in the illustrated example) with flat rectangular cross sections in the beam width direction without adhesive, and fixing the multiple pieces of wood M with fastening means such as bolts and nuts. Therefore, in this embodiment, each piece of wood M of the X-direction column 2x and each piece of wood M of the X-direction beam 1x are semi-rigidly joined by the above-mentioned joint structure.

The pin joint is a joint structure with a low degree of fixation that is considered to hardly transmit bending moments in structural calculations of the frame. In this embodiment, for example, as shown in Fig. 4, a U-shaped mounting bracket 12 such as a Presetter (registered trademark) attached to both sides of the short side direction (vertical direction in the figure) of the X-direction column 2x with a through bolt 11 or the like is embedded in the end face of the Y-direction beam 1y, and a drift pin (not shown) or the like is driven into the Y-direction beam 1y in a state crossing the U-shaped mounting bracket 12 in the embedded state, thereby pin-joining the X-direction column 2x and the Y-direction beam 1y.
In addition, instead of this joint structure, an L-shaped gusset plate may be placed across the X-direction column 2x and the Y-direction beam 1y and then fixed with screws or the like to pin-join the X-direction column 2x and the Y-direction beam 1y, and various other joint structures capable of pin joints can be adopted.

As shown in FIG. 4, the Y-direction beam 1y is constructed by stacking multiple pieces of wood M (two in the illustrated example) with flat rectangular cross sections in the beam width direction without gluing them together, and fastening the multiple pieces of wood M with fastening means such as bolts and nuts. Therefore, in this embodiment, the pieces of wood M of the X-direction column 2x and the Y-direction beam 1y are each pin-joined using the joint structure described above.

Next, the column base structure of a rectangular cross-section column P (corresponding to a column base structure for a wooden column) will be explained with reference to Figure 5. In Figure 5, an X-direction column 2x in which the horizontal force resistance direction is the X-direction is shown as an example of a rectangular cross-section column P.

As shown in FIG. 5(a), the rectangular cross-section column P is installed on the foundation 41 using a steel column base hardware 31. The column base hardware 31 is provided with a flat rectangular plate portion 31A that is arranged substantially horizontally on the foundation 41, and a plurality of insertion portions 31B that extend upward from the middle portion of the plate portion 31A in the longitudinal direction (X direction in the figure, the horizontal force resistance direction) and are inserted into the through-holes 32 at the lower end of the rectangular cross-section column P arranged in the middle portion. Because the column base hardware 31 only has one plate portion 31A, the number of plate portions that make up the column base hardware 31 can be reduced to simplify the structure and improve workability during construction.

In the plate portion 31A, the outward extension portion 31a that extends outward on both sides in the longitudinal direction (X direction in the figure) beyond the installation portion of the rectangular cross-section column P has an insertion portion (not shown) through which the head of an anchor bolt 33 fixed to the foundation 41 can be inserted, for example. Then, nuts 34 or the like are fastened to the head of the anchor bolt 33 inserted into these insertion portions, and the anchor bolt 33 is fixed to the outward extension portion 31a, whereby the column base hardware 31 is fixed onto the foundation 41.

In other words, the plate portion 31A is arranged so that the horizontal force resistance direction (strong axis direction (long side direction)) of the rectangular cross-section column P is the longitudinal direction (X direction in the figure), the anchor bolts 33 are fixed to both ends in the longitudinal direction, and the insertion portion 31B is arranged in the middle of the longitudinal direction, and the insertion portion 31B and the anchor bolt 33 are arranged side by side in the longitudinal direction.

Therefore, when the horizontal force acting in the strong axis direction of the horizontal force resistance direction of the rectangular cross-section column P acts as a bending stress with the short side direction as the axis of rotation at the longitudinal middle part of the plate part 31A, the installation interval of the anchor bolts 33 which receive a pull-out force due to the bending stress can be set to a wide interval between both longitudinal ends of the plate part 31A along the horizontal force resistance direction, and the pull-out resistance force of the anchor bolts 33 can be well secured.

The multiple insertion parts 31B are made of rod-shaped hollow metal such as Home Connector (registered trademark), and are integral with the column base metal 31 by fixing their lower ends to the plate part 31A by welding or the like. The multiple insertion parts 31B made of hollow metal are inserted into the through holes 32 at the lower end of the rectangular cross-section column P, and adhesive (not shown) is filled inside and outside the multiple insertion parts 31B and allowed to harden, thereby fixing the column base metal 31 to the rectangular cross-section column P.

Furthermore, the plate portion 31A is provided with a rib plate 31D that extends the entire length or nearly the entire length in the longitudinal direction (X direction in the figure) along the horizontal force resistance direction and resists bending deformation of the plate portion 31A. Therefore, when a horizontal force acts on the rectangular cross-section column P during an earthquake, etc., the rib plate 31D can prevent bending deformation of the plate portion 31A due to bending stress acting on the plate portion 31A from the rectangular cross-section column P, and the bending stress can be appropriately transmitted to the foundation 41 through the plate portion 31A.

As shown in Figures 5(b) and 5(c), multiple rib plates 31D are provided at intervals in the short-side direction of plate portion 31A (Y direction in the figure, corresponding to the perpendicular direction perpendicular to the horizontal force resistance direction). Specifically, the multiple rib plates 31D include two first rib plates 31b on both outer sides of plate portion 31A in the short-side direction, and two second rib plates 31c in the middle of plate portion 31A in the short-side direction.

The two first rib plates 31b on both outer sides in the short side direction of the plate portion 31A are arranged on both outer sides that are offset in the short side direction from the arrangement portion of the rectangular cross section column P of the plate portion 31A. Specifically, the first rib plates 31b are arranged at a position spaced apart from the outer surface of the rectangular cross section column P in the short side direction.
On the other hand, the two second rib plates 31c in the intermediate portion of the plate portion 31A in the short side direction are arranged in the intermediate portion overlapping with the arrangement portion of the rectangular cross section column P of the plate portion 31A. Specifically, the second rib plates 31c correspond to the rectangular cross section column P being constructed by stacking three pieces of wood M without bonding in the short side direction (Y direction in the figure) of the plate portion 31A, and are arranged in the intermediate portion of the plate portion 31A at the portion corresponding to the boundary of the multiple pieces of wood M that constitute the rectangular cross section column P in the short side direction.

In this way, multiple rib plates 31D are distributed over the entire plate portion 31A, effectively utilizing the installation locations of the rectangular cross-section column P, so bending deformation of the plate portion 31A can be more effectively suppressed when a horizontal force acts on the rectangular cross-section column P during an earthquake, etc.

Furthermore, in this embodiment, as described above, the rectangular cross-section column P is constructed by stacking three pieces of wood M without gluing them in the short direction (Y direction in the figure) of the plate portion 31A, and in the three plate portions 31A, anchor bolts 33 and insertion portions 31B are arranged in each of three (one example of multiple) individual wood corresponding areas A (specifically, three areas divided by two second rib plates 31c in the middle of the short direction) which are divided in the short direction corresponding to each of the pieces of wood M that constitute the rectangular cross-section column P.
In other words, since each of the three individual wood corresponding area portions A of the plate portion 31A is fixed onto the foundation 41 by an anchor bolt 33, and the wood M is fixed by the insertion portion 31B, the horizontal force acting on each of the three pieces of wood M that constitute the rectangular cross-section column P can be efficiently transmitted to the foundation 41 via the insertion portion 31B and anchor bolt 33 arranged in each of the individual wood corresponding area portions A.

[Another embodiment]
Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the wooden pillar is configured as a rectangular cross-section pillar P, but it may be configured as a square cross-section pillar or a circular cross-section pillar.

(2) In the above embodiment, an example was shown in which three individual wood corresponding area portions A are provided on the plate portion 31A of the column base metal fitting 31 in response to the rectangular cross-section column P being constructed by stacking three pieces of wood M without adhesive, but the number of pieces of wood M constituting the rectangular cross-section column P may be two or four or more. The number of individual wood corresponding area portions A may also be two or four or more, as long as it is a number corresponding to or greater than the number of pieces of wood M constituting the rectangular cross-section column P.

(3) In the above embodiment, a plurality of first rib plates 31b and a plurality of second rib plates 31c are shown as examples of the multiple rib plates 31D provided on the plate portion 31A of the column base hardware 31, but either one may be used.

(4) In the above embodiment, the first rib plate 31b is provided on both outer sides of the plate portion 31A of the column base hardware 31, which is located on both outer sides of the installation location of the rectangular cross-section column P in the short direction. However, it may be provided on only one of the outer sides.

2x X direction pillar (wooden pillar)
2y Y direction pillar (wooden pillar)
3 x X-direction earthquake-resistant studs (wooden studs)
3y Y-direction earthquake-resistant stud (wooden stud)
31 Column base metal fitting 31A Plate portion 31B Insertion portion 31D Rib plate 31a Outward extension portion 31b First rib plate 31c Second rib plate 33 Anchor bolt 41 Foundation A Individual wood corresponding area portion M Wood P Rectangular cross-section column (wooden Pillar)

Claims (4)

A wooden column base structure in which a wooden column is installed on a foundation using a column base metal fitting,
The column base metal includes a plate portion to be placed on a foundation and an insertion portion extending upward from the plate portion and inserted into the wooden column,
The plate portion has an outward extension portion that extends outward from the installation portion of the wooden post, and an anchor bolt that is fixed to the foundation is fixed to the outward extension portion.
The plate portion has anchor bolts fixed to both ends in a horizontal force resistance direction in which the wooden post resists a horizontal force, and an insertion portion is disposed in an intermediate portion in the horizontal force resistance direction, and the insertion portions and the anchor bolts are arranged in line in the horizontal force resistance direction,
A column base structure for a wooden column, wherein the plate portion is provided with a rib plate extending in the horizontal force resistance direction and resisting bending deformation of the plate portion. The rib plate is provided in a plurality of spaces in the plate portion in a direction perpendicular to the horizontal force resistance direction,
2. The wooden column base structure according to claim 1, wherein the plurality of rib plates include a first rib plate arranged in an outer portion outwardly of the installation portion of the wooden column in the perpendicular direction, and a second rib plate arranged in an intermediate portion overlapping with the installation portion of the wooden column in the perpendicular direction. The wooden pillar is constructed by laminating a plurality of rectangular cross-section wooden pieces without adhesive in the orthogonal direction,
3. The wooden column base structure according to claim 2, wherein the second rib plate is disposed at a portion of the plate portion that corresponds to a boundary between the wooden pieces in the orthogonal direction. The wooden column is constructed by laminating a plurality of rectangular cross-section wooden pieces without adhesive in the plate portion in a direction perpendicular to the horizontal force resistance direction,
The wooden column base structure according to any one of claims 1 to 3, wherein the insertion portion and the anchor bolt are arranged in each of the individual wood corresponding area portions divided in the orthogonal direction in the plate portion corresponding to each of the plurality of wood pieces constituting the wooden column.

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