JP6861091B2 - Anchor bolt fixing bracket for wooden column base hardware and wooden column base structure using it - Google Patents

Description

The present invention is an anchor bolt fixing bracket used when fixing a column base metal fitting to which a wooden column is attached to the upper part to the foundation via an anchor bolt protruding from the upper surface of the foundation of a wooden building, and a wooden column using the anchor bolt fixing bracket. Regarding leg structure.

Anchor bolts used for column bases are buried in advance so that the upper part of the bolts protrude from the upper surface of the foundation. However, in the case of wooden column bases, particularly, positions that are significantly deviated from a predetermined position due to construction errors or the like. Often provided in. Therefore, in order to absorb the construction error of the anchor bolt position when the wooden column base metal is installed on the foundation, the bolt insertion hole provided in the base plate of the column base metal is formed with a diameter as large as possible.

However, if the bolt insertion hole is formed with a large diameter, the gap between the anchor bolt and the inner peripheral surface of the bolt insertion hole becomes large, so that the shear force acting on the column base metal (base plate) cannot be borne by the anchor bolt. .. Therefore, in order to ensure that the anchor bolt bears the shearing force acting on the column base hardware, a grout material is filled in the gap between the bolt insertion holes or a metal fitting (washer) is fitted (for example,). See Patent Documents 1 and 2).

For example, in the invention described in Patent Document 1, a disc-shaped cylindrical portion having a circular hole eccentric to the center, which is fitted into a circular hole of a base plate horizontally joined to the lower surface of a column base metal fitting, is formed. From the adjusting washer to have and the sliding washer having a disk-shaped cylindrical portion fitted in the circular hole of the adjusting washer and also eccentric with respect to the center and having a circular bolt hole for inserting an anchor bolt. Then, the sliding washer fits into the circular hole of the adjustment washer and is inserted together into the circular hole of the base plate, and the position of the column base metal that holds the column base is adjusted with respect to the anchor bolt to adjust the column base metal. We are proposing a fine adjustment device for column base hardware for installation.

Further, in the invention described in Patent Document 2, a part of the cylinder is cut off in parallel with the axis to form a C-shaped cross section, and the wall thicknesses on both sides of the C-shaped cylinder are sequentially formed thin toward the opening end. In addition, a shearing force transmitter is proposed in which a groove and a convex portion are provided on the outer peripheral surface in parallel with the axis, and one end side of the convex portion is formed in a tapered portion so as to be flush with the cylindrical surface.

Japanese Unexamined Patent Publication No. 02-13642 Japanese Unexamined Patent Publication No. 09-287138

By the way, the pillar base hardware used for the wooden pillar base is often in the form of a wooden pillar fixed to the upper part or a box shape having a size that fits in the base attached to the side part from the viewpoint of design. In that case, the inside of the column base hardware becomes a narrow space of about 100 mm, and fixing work with anchor bolts or the like is performed in the limited space.

However, in the invention described in Patent Document 1, since the adjusting washer and the sliding washer are configured by integrating the flange portion and the cylindrical portion, the thickness (height) of the entire washer becomes thicker, and the box becomes thicker. There is a problem that it is difficult to insert a washer from the upper part of the anchor bolt when it is attached to an anchor bolt installed in a place having a limited space inside the column base hardware.

In particular, the sliding washer to be inserted after the adjustment washer is set has a remarkable problem because the internal space is further narrowed by the thickness of the flange portion of the adjustment washer.

Further, the adjusting washer and the sliding washer of Patent Document 1 have a corner portion at the boundary portion of the flange portion and the cylindrical portion because the flange portion and the cylindrical portion are integrated, and further, the circular hole is eccentric. The wall thickness of the cylindrical portion on the eccentric side becomes thin. Therefore, when a force acts on the flange portion and stress is concentrated on the corner portion, there is a risk of breaking from the thin portion. In order to eliminate this concern, the flange portion should be extended to increase the contact area with the base plate, or the thickness should be increased, but the former is limited to the inside of the box-shaped column base hardware. When used in a space, it interferes with the side surface of the hardware, so it is not possible to lengthen the output too much. Therefore, in order to lengthen the protrusion, the inner diameter of the bolt insertion hole must be reduced, which may make it impossible to install the column base hardware due to the above-mentioned construction error of the anchor bolt. In the latter case, the thickness (height) of the entire washer is further increased, so that the workability of inserting into the anchor bolt described above is further deteriorated.

On the other hand, the two shearing force transmitters having a C-shaped cross section described in Patent Document 2 are fitted into the bolt insertion holes of the base plate, and then the anchor bolts are inserted into the anchor bolts to tighten the nuts to tighten the base plate (pillar). It is fixed to the foundation (leg hardware), but this is for column bases that do not have members that block the space around the bolt insertion holes such as steel column bases (base plates). It is difficult to use it for column base hardware that has a space.

In other words, the washer is usually sized to cover the entire bolt insertion hole, and a through hole with an inner diameter almost the same as the anchor bolt diameter is formed in the center, but when trying to form the bolt insertion hole with the largest possible diameter. Even when the anchor bolt is provided at the position where it is eccentric to the maximum, the entire bolt insertion hole must be covered, so that the washer needs to be at least twice the inner diameter of the bolt insertion hole. Therefore, in the limited space inside the box-shaped wooden column base hardware, such a large washer cannot be used because it interferes with the side surface of the hardware.

If the technique of Patent Document 2 is applied to a box-shaped wooden column base metal fitting, the inner diameter of the bolt insertion hole can be formed up to about 1/2 of the internal space at most. Similar to the described adjustable washers and sliding washers, there is a possibility that column base hardware cannot be installed due to the construction error of anchor bolts.

Therefore, the present invention has been made in view of such problems, and even for a box-shaped wooden column base metal having a limited internal space, bolt insertion holes of the base plate are formed with as large a diameter as possible. In addition, even if the anchor bolts are installed at the maximum eccentric position, it is possible to securely attach the anchor bolt fixing brackets without interfering with the side surface of the column base hardware, and the column is more than the conventional column base structure. It is an object of the present invention to provide anchor bolt fixing metal fittings for wooden column base hardware capable of ensuring leg toughness (tenacity) and a wooden column base structure using the metal fittings.

In order to solve the above problems, the anchor bolt fixing brackets for wooden column base hardware according to the present invention are made of box-shaped wooden column base metal having a wooden column attached to the upper surface and one end protruding from the upper surface of the foundation. Anchor bolt fixing brackets for fixing anchor bolts inserted into bolt insertion holes larger than the diameter of anchor bolts formed on the base plate of column base hardware, and the anchor bolt fixing brackets are plan view, crescent moon. An outer ring and an inner ring having a shape and a lower seat and an upper seat installed on the outer ring and the inner ring are provided, and the outer ring is substantially the same as the bolt insertion hole formed in the base plate. It has an outer ring opening having an outer peripheral surface having a radius and an inner peripheral surface having an inner peripheral surface having substantially the same radius as the outer peripheral surface of the inner ring, centered on a position eccentric from the center of the outer peripheral surface by a predetermined eccentric distance. The inner ring is centered on an outer peripheral surface having a radius substantially the same as the outer ring opening of the outer ring and a position eccentric from the center of the outer peripheral surface by the same distance as the eccentric distance of the outer ring. It has an inner ring opening having an inner peripheral surface having an inner peripheral surface having a radius substantially equal to 1/2 of the outer diameter of the bolt, and the lower seat metal has an outer diameter larger than the inner diameter of the bolt insertion hole formed in the base plate. Eccentricity obtained by subtracting only 1/2 of the outer diameter of the anchor bolt from 1/2 of the value obtained by adding the radius of the bolt insertion hole and 1/2 of the outer diameter of the anchor bolt from the center of the lower seat metal. It has an eccentric hole for the lower seat bolt centered on a position eccentric by a distance, and the upper seat bolt has an outer diameter smaller than the outer diameter of the lower seat bolt, and also has an eccentric distance from the center of the upper seat bolt to the eccentric distance of the lower seat bolt. It has a circular upper seat eccentric hole centered on a position eccentric by the same distance and having an inner diameter substantially the same as the outer diameter of the anchor bolt, and the shape of the lower seat eccentric hole in plan view is that of the anchor bolt. A bolt contour that is set to be larger than the outer diameter and smaller than the inner diameter of the bolt insertion hole and the outer diameter of the upper seat metal, and further, the outer shape of the anchor bolt inserted into the lower seat metal eccentric hole is projected. From the state where the center of the line is located at the center of the lower seat, 1/2 of the outer diameter of the anchor bolt is subtracted from the radius of the bolt insertion hole of the base plate on the horizontal center line passing through the center of the lower seat. A contour shape drawn so as to surround each trajectory of the bolt contour line up to the state when it is moved to a distance on the upper side and the lower side of the horizontal center line. It is characterized by being made up.
Here, in the anchor bolt fixing bracket, the shape of the lower washer eccentric hole in a plan view is such that at least one of the contours on the upper side or the lower side of the horizontal center line passing through the center of the lower washer is the eccentricity of the lower washer. A semi-circular arc having a radius of 1/2 of the value obtained by adding the radius of the bolt insertion hole of the base plate and 1/2 of the outer diameter of the anchor bolt is formed around the position eccentric by the distance. Is also good.
Further, in the anchor bolt fixing bracket, the shape of the lower washer eccentric hole in a plan view is such that the contour of the upper side or the lower side of the horizontal center line passing through the center of the lower washer is also eccentric by the eccentric distance of the lower washer. A semicircular arc may be formed with a radius of 1/2 of the value obtained by adding the radius of the bolt insertion hole of the base plate and 1/2 of the outer diameter of the anchor bolt.
Further, in the anchor bolt fixing bracket, the shape of the eccentric hole of the lower washer in a plan view is such that the other contour on the upper side or the lower side of the horizontal center line passing through the center of the lower washer is the center of the bolt contour line. A state in which the lower washer is located at the center and a state in which the horizontal center line is moved to a distance obtained by subtracting 1/2 of the outer diameter of the anchor bolt from the radius of the bolt insertion hole of the base plate. The first contour line connecting the intersections of the lines hanging from the center of the bolt contour line and the bolt contour lines, and the directions in which both ends of the first contour line are separated from each other along the circumference of the bolt contour line. It may be formed into a contour shape including a second contour line extending to the horizontal center line.
Further, in the anchor bolt fixing bracket, on the upper surface side of the lower washer, there is an upper washer fixing recess set to a size in which the upper washer is fitted, centered on a position eccentric by the eccentric distance of the lower washer. It is even better if it is formed.
Further, in the anchor bolt fixing bracket, the lower surface side of the upper washer is on a straight line connecting the center of the upper washer and the center of the eccentric hole of the upper washer, and the upper washer is relative to the center of the upper washer. It is further preferable that a protrusion is provided on the opposite side of the eccentric hole and so that the outer surface is in contact with a virtual arc having the same radius as the radius of the lower washer eccentric hole of the lower washer from the center of the upper washer.
Further, in the anchor bolt fixing bracket, an inner ring recess having a radius larger than the radius of the inner ring opening is formed along the inner peripheral surface of the inner ring on the bottom surface side of the inner ring. And even better.
Further, the wooden column base structure using the anchor bolt fixing bracket according to the present invention is a box-shaped wooden column base metal fitting in which a wooden column is attached to the upper surface and one or two side surfaces are open to the outside. Anchor bolts, one end of which is projected from the upper surface of the foundation and inserted into a bolt insertion hole larger than the diameter of the anchor bolt formed in the base plate of the wooden column base metal, are used with one of the above anchor bolt fixing brackets. In a fixed wooden column base structure, the outer ring and the inner ring are such that the inner ring is fitted into the outer ring opening of the outer ring and the anchor bolt is fitted into the inner ring opening of the inner ring. Is inserted into the bolt insertion hole of the base plate, and the lower washer has the anchor bolt inserted into the lower washer eccentric hole of the lower washer, and the center of the lower washer is centered on the base plate. The upper washer is installed on the outer ring and the inner ring so as to substantially coincide with the center of the bolt insertion hole of the upper washer, and the upper washer is the lower washer with the anchor bolt inserted into the eccentric hole of the upper washer of the upper washer. It is characterized in that a nut screwed to an upper end portion of the anchor bolt is fastened to the upper surface of the upper washer while being installed on the upper surface.

The anchor bolt fixing bracket for a wooden leg hardware pillar according to the present invention includes an outer ring and an inner ring having a crescent shape in a plan view, and a lower washer and an upper washer installed on the outer ring and the inner ring. The outer ring is centered on the outer peripheral surface having a radius substantially the same as the bolt insertion hole formed in the base plate and the position eccentric from the center of the outer peripheral surface by a predetermined eccentric distance, and is almost the same as the outer peripheral surface of the inner ring. It has an outer ring opening with an inner peripheral surface consisting of a radius, and the inner ring has an outer peripheral surface having approximately the same radius as the outer ring opening of the outer ring and an eccentric distance of the outer ring from the center of the outer peripheral surface. It has an inner ring opening centered on a position eccentric by the same distance and has an inner peripheral surface having a radius almost equal to 1/2 of the outer diameter of the anchor bolt, and the lower washer is a bolt insertion formed in the base plate. It has an outer diameter larger than the inner diameter of the hole, and from 1/2 of the value obtained by adding the radius of the bolt insertion hole and 1/2 of the outer diameter of the anchor bolt from the center of the lower washer to 1 / of the outer diameter of the anchor bolt. It has a lower washer eccentric hole centered on a position eccentric by the eccentric distance obtained by subtracting only 2, and the upper washer has an outer diameter smaller than the outer diameter of the lower washer, and the eccentricity of the lower washer from the center of the upper washer. It has a circular upper washer eccentric hole with an inner diameter almost the same as the outer diameter of the anchor bolt centered on a position eccentric by the same eccentric distance as the distance, and the shape of the lower washer eccentric hole in plan view is that of the anchor bolt. The center of the bolt contour line is set to be larger than the outer diameter and smaller than the inner diameter of the bolt insertion hole and the outer diameter of the upper washer, and the outer diameter of the anchor bolt inserted into the lower washer eccentric hole is projected. , The state when the horizontal center line passing through the center of the lower washer is moved from the state located at the center of the lower washer to the distance obtained by subtracting 1/2 of the outer diameter of the anchor bolt from the radius of the bolt insertion hole of the base plate. Each locus of the bolt contour line up to is formed in a contour shape drawn so as to surround all the trajectories above and below the horizontal center line.
This makes it possible to easily attach the anchor fixing bracket to the anchor bolt even in a box-shaped wooden column base metal fitting having a limited space, and where the anchor bolt is located in the bolt insertion hole of the base plate. Even if it is inserted into the bolt, the lower washer with its center almost aligned with the center position of the bolt insertion hole can be installed by rotating the position at best without moving it back and forth and left and right, and it is fixed to the anchor bolt. It can be done and their workability is improved.
Therefore, even if the box-shaped wooden washer has a limited space, the bolt insertion hole of the base plate can be formed with the largest possible diameter, and the anchor bolt is maximally eccentric in the bolt insertion hole. Even in such a case, the lower washer, the upper washer, and the like can be fixed to the anchor bolts without interfering with the wooden column base metal, so that the wooden column base metal can be reliably installed at a predetermined position.
Further, according to the anchor bolt fixing bracket for wooden column base metal fittings according to the present invention, when the anchor bolt and the wooden column base metal fitting are fixed by using this metal fitting, the anchor bolt and the lower washer in the lower washer eccentric hole. A space is formed between the peripheral surface (around the anchor bolt). As a result, when a large force is applied to the column base due to an earthquake or the like, the upper washer located on the upper side of the space is deformed in the out-of-plane direction and contributes to the toughness (tenacity) of the column base. Along with the elongation deformation of the column base, the toughness of the column base can be secured more than before.

It is sectional drawing which shows the installation example of the anchor bolt fixing metal fitting for wooden column base metal fittings of Embodiment 1 which concerns on this invention. FIG. 5 is a perspective view showing a method of stacking an outer ring and an inner ring, and a lower washer and an upper washer, which constitute an anchor bolt fixing bracket for wooden column base hardware according to the first embodiment of the present invention. (A) to (c) are a perspective view, a plan view, and a sectional view taken along line AA of the outer ring constituting the anchor bolt fixing bracket for the wooden column base metal fitting of the first embodiment, respectively. (A) to (c) are a perspective view, a plan view, and a sectional view taken along line BB of the inner ring constituting the anchor bolt fixing bracket for the wooden column base metal fitting of the first embodiment, respectively. (A) to (c) are a perspective view, a plan view, and a sectional view taken along line CC of the upper washer constituting the anchor bolt fixing bracket for the wooden column base metal fitting of the first embodiment, respectively. (A) to (c) are a perspective view, a plan view, and a cross-sectional view taken along the line DD of the lower washer constituting the anchor bolt fixing bracket for the wooden column base metal fitting of the first embodiment, respectively. It is a figure which shows the positional relationship of the anchor bolt inserted into the eccentric hole of the lower washer when the lower washer which constitutes the anchor bolt fixing metal fitting for the wooden column base metal fitting of Embodiment 1 which concerns on this invention is installed. (A) and (b) show an example of the positional relationship between the outer ring and the inner ring when the anchor bolt in FIG. 7 is installed at the first bolt position α, and the positional relationship between the upper washer and the lower washer, respectively. It is a figure. (A) and (b) show an example of the positional relationship between the outer ring and the inner ring when the anchor bolt is installed at the second bolt position β in FIG. 7, and the positional relationship between the upper washer and the lower washer, respectively. It is a figure. 9 is a cross-sectional view showing a cross section taken along line FF in FIG. 9B. (A) and (b) show an example of the positional relationship between the outer ring and the inner ring when the anchor bolt is installed at the third bolt position γ in FIG. 7, and the positional relationship between the upper washer and the lower washer, respectively. It is a figure. In (a) and (b), the positional relationship between the outer ring and the inner ring when the anchor bolts are installed at positions different from the positions shown in FIGS. 8, 9, and 11, respectively, and the upper washer and the lower one. It is a figure which shows an example of the positional relationship of a washer. In (a) and (b), the positional relationship between the outer ring and the inner ring when the anchor bolts are installed at positions different from the positions shown in FIGS. 8, 9, and 11, respectively, and the upper washer and the lower one. It is a figure which shows another example of the positional relationship of a washer. (A) and (b) are a plan view of the lower washer constituting the anchor bolt fixing bracket for the wooden column base metal fitting of the second embodiment according to the present invention, respectively, and the lower washer is eccentric when the lower washer is installed on the base plate. It is a figure which shows four typical positions of the anchor bolt inserted through a hole. (A) and (b) are a plan view of the lower washer constituting the anchor bolt fixing bracket for the wooden column base metal fitting of the third embodiment according to the present invention, respectively, and the lower washer is eccentric when the lower washer is installed on the base plate. It is a figure which shows two typical positions of the anchor bolt inserted through a hole. (A) to (c) are a perspective view, a plan view, and a sectional view taken along line GG of the lower washer constituting the anchor bolt fixing bracket for the wooden column base metal fitting of the fourth embodiment, respectively. (A) to (c) are a perspective view, a plan view, and a sectional view taken along line HH of the upper washer constituting the anchor bolt fixing bracket for the wooden column base metal fitting of the fourth embodiment, respectively. FIG. 5 is an enlarged bottom view of an upper washer constituting an anchor bolt fixing bracket for wooden column base hardware of the fourth embodiment. (A) to (c) In the anchor bolt fixing brackets for wooden column base hardware of the fourth embodiment, the upper washer when the anchor bolts are located at the first bolt position α, the second bolt position β, and the third bolt position γ, respectively. It is a figure which shows the positional relationship of the lower washer. 19 (a) is a cross-sectional view showing a cross section taken along line I-I. It is sectional drawing which shows the JJ line cross section in FIG. 19 (b).

Hereinafter, embodiments 1 to 4 of the anchor bolt fixing bracket for the wooden column base hardware according to the present invention and the wooden column base structure using the fixing bracket will be described. The embodiments described below are merely examples of the present invention, and the present invention is not limited to the following embodiments, and can be appropriately modified within the scope of the technical idea of the present invention.

Embodiment 1.
First, an anchor bolt fixing bracket 1 used for the wooden column base hardware of the first embodiment according to the present invention and a wooden column base structure using the fixing bracket 1 will be described.

<Structure of Anchor Bolt Fixing Bracket 1 of Embodiment 1>
As shown in FIGS. 1 and 8, in the anchor bolt fixing bracket 1 of the first embodiment, a wooden pillar 3 is attached to the upper surface portion 23, and side surface portions 22 are erected from three sides of the base plate 21 at one location. It is used for fixing a box-shaped wooden column base metal 2 whose side surface is open to the outside and an anchor bolt 4 whose one end protrudes from the upper surface of the foundation 5, and is used in a plan view as shown in FIG. The outer ring 11 and the inner ring 12 which are crescent-shaped, and the circular lower washer 14 and the upper washer 13 which are installed on the outer ring 11 and the inner ring 12 are provided. In FIG. 1, reference numeral 6 is a nut. Although two nuts 6 are used here, only one nut 6 may be used in the present invention.

(Outer ring 11)
As shown in FIGS. 3A to 3C, the outer ring 11 has an outer peripheral surface 11a having an arc having a radius r11a centered on the position of 11x which is the center of the outer ring 11 in a plan view, and the center 11x thereof. It has an inner peripheral surface 11b having an arc having a radius r11b centered on an eccentric position 11y eccentric by a predetermined eccentric distance L1, and has an outer ring opening 11c partially surrounded by the inner peripheral surface 11b. It is formed in a crescent shape.

Here, the radius r11a of the outer peripheral surface 11a of the outer ring 11 is substantially the same as the radius r21a of the bolt insertion hole 21a (see FIG. 7) so that the outer peripheral surface 11a fits into the bolt insertion hole 21a of the base plate 21 without a gap. Set to the same. Further, the radius r11b of the inner peripheral surface 11b of the outer ring 11 is the radius r12a of the outer peripheral surface 12a of the inner ring 12 so that the outer peripheral surface 12a of the inner ring 12 described later fits into the outer ring opening 11c without a gap (FIG. It is set to be almost the same as 4 (b).).

The thickness of the outer ring 11 and the inner ring 12 is the same as the thickness of the base plate 21 of the column base hardware 2. Further, the eccentric distance L1 of the outer ring 11 is the same as the eccentric distance L2 of the inner ring 12, which will be described later.

(Inner ring 12)
As shown in FIGS. 4A to 4C, the inner ring 12 has an outer peripheral surface 12a having an arc having a radius r12a centered on the position of 12x which is the center of the inner ring 12 in a plan view, and the center 12x thereof. It is provided with an inner peripheral surface 12b having an arc having a radius r12b centered on an eccentric position 12y eccentric by a predetermined eccentric distance L2, and has an inner ring opening 12c partially surrounded by the inner peripheral surface 12b. It is formed in a crescent shape.

Here, the radius r12a of the outer peripheral surface 12a of the inner ring 12 is substantially the same as the radius r11b of the inner peripheral surface 11b of the outer ring 11 so that the outer peripheral surface 12a fits into the outer ring opening 11c of the outer ring 11 without a gap. Set to the same.

Further, the radius r12b of the inner peripheral surface 12b of the inner ring 12 is 1 of the outer diameter R4 (see FIG. 7) of the anchor bolt 4 so that the outer peripheral surface of the anchor bolt 4 fits into the inner ring opening 12c without a gap. It is set to be almost the same as / 2.

Further, on the bottom surface side of the inner ring 12, as shown in FIG. 4C and the like, an inner ring having a radius larger than the radius r12b of the inner ring opening 12c along the inner peripheral surface 12b of the inner ring 12 A recess 12d is formed.

By forming the inner ring recess 12d, when the inner ring 12 is attached to the anchor bolt 4, the bottom surface of the inner ring 12 is avoided by avoiding the concrete glue adhering around the anchor bolt 4 directly above the upper surface of the foundation 5. Since it becomes difficult to form a gap between the foundation 5 and the upper surface of the foundation 5, the initial rigidity of the column base portion does not significantly decrease, and a predetermined performance as a wooden column base can be sufficiently exhibited. In the present invention, it is not essential to provide the inner ring recess 12d, and it may be omitted.

(Upper washer 13)
As shown in FIGS. 5A to 5C, the upper washer 13 has a circular outer shape and is formed smaller than the outer shape of the lower washer 14, and is further defined from the center 13x of the upper washer 13. It has a circular upper washer eccentric hole 13a centered on the eccentric position 13y eccentric by the eccentric distance L3. Here, the inner diameter of the upper washer eccentric hole 13a is set to be substantially the same as the outer diameter R4 (see FIG. 7) of the anchor bolt 4 so that the anchor bolt 4 can be inserted. The upper washer 13 has a size that hides the lower washer eccentric hole 14a no matter where the anchor bolt 4 is located in the lower washer eccentric hole 14a, which will be described later, from the viewpoint of stress transmission with the lower washer 14. Is preferable. Further, t13 shown in FIG. 5C is the thickness of the upper washer 13.

Further, when the upper washer fixing recess 14b, which will be described later, is formed on the upper surface side of the lower washer 14 of the first embodiment, the outer shape of the upper washer 13 has a size that fits into the upper washer fixing recess 14b. Set.

(Lower washer 14)
As shown in FIGS. 6A to 6C, the lower washer 14 has a circular outer shape, has an outer diameter larger than the inner diameter thereof in order to cover the entire bolt insertion hole 21a of the base plate 21, and has an outer diameter larger than the inner diameter thereof. On the horizontal center line CL passing through the center 14x of the lower washer 14, the lower washer eccentric hole 14a having a peculiar shape centered on the eccentric position 14y eccentric from the center 14x by the same eccentric distance L4 as the eccentric distance L3 of the upper washer 13. have. The size of the lower washer eccentric hole 14a is set to be larger than the outer diameter R4 of the anchor bolt 4 and smaller than the inner diameter of the bolt insertion hole 21a and the outer diameter of the upper washer 13, more preferably the column base. It is desirable that the inner ring 12 has a dimensional shape so as not to come out of the bolt insertion hole 21a when a force is applied to the portion.

Further, the lower washer 14 of the first embodiment is formed with a circular upper washer fixing recess 14b centered on the eccentric position 14y on the upper surface side thereof.

Here, the eccentric distance L4 between the center 14x of the lower washer 14 and the eccentric position 14y which is the center of the lower washer eccentric hole 14a and the upper washer fixing recess 14b is the center 13x of the upper washer 13 and the eccentric position 13y. The eccentric distance between them is set to be the same as L3. More specifically, the anchor bolt is derived from 1/2 of the value obtained by adding the radius r21a (see FIG. 7) of the bolt insertion hole 21a of the base plate 21 and 1/2 of the outer diameter R4 (see FIG. 7) of the anchor bolt 4. The distance is set by subtracting 1/2 of the outer diameter R4 of 4.

The radius of the upper washer fixing recess 14b is set to be substantially the same as the radius r13 of the upper washer 13 so that the upper washer 13 is fitted and fixed without a gap. The depth d14 of the upper washer fixing recess 14b is arbitrary, but it is preferably set smaller than the thickness t13 of the upper washer 13 from the viewpoint of installation workability of the upper washer 13.

As will be described later, in the anchor bolt fixing bracket 1 according to the present invention, the lower washer 14 is installed so that the center 14x thereof and the center of the base plate insertion hole 21a are substantially aligned with each other. Since the lower washer eccentric hole 14a larger than the outer diameter R4 of the anchor bolt 4 is formed, if the upper surface of the lower washer 14 is a flat single surface, when the upper washer 13 is installed thereafter, The position of the lower washer 14 may shift. However, since the lower washer 14 of the first embodiment has the upper washer fixing recess 14b formed on the upper surface thereof, the lower washer 13 has the upper washer eccentric hole 13a inserted through the anchor bolt 4. When the upper surface of the 14 is rotated and fitted into the upper washer fixing recess 14b, the lower washer 14 is fixed to the anchor bolt 4 together with the upper washer 13, and the installation position thereof is fixed. Therefore, the lower washer 14 can be easily fixed to the anchor bolt 4 at an appropriate position, and the workability thereof can be improved.

(Lower washer eccentric hole 14a of lower washer 14)
Next, the shape of the lower washer eccentric hole 14a of the lower washer 14 in a plan view will be described. As shown in FIG. 6B, the shape of the lower washer eccentric hole 14a formed in the lower washer 14 of the first embodiment has contours (holes) above and below the horizontal center line CL. The shape of the edge) is formed into a unique asymmetrical shape with different shapes.

First, in the lower washer eccentric hole 14a above the horizontal center line CL passing through the center 14x of the lower washer 14 and the eccentric position 14y, the contour line (hole edge) 14a1 in the plan view is centered on the eccentric position 14y. A semi-circular shape whose radius is 1/2 of the value obtained by adding the radius r21a (see FIG. 7) of the bolt insertion hole 21a of the base plate 21 and 1/2 of the outer diameter R4 (see FIG. 7) of the anchor bolt 4. It is formed in the arc of.

On the other hand, regarding the contour line (hole edge) 14a2 of the lower washer eccentric hole 14a below the horizontal center line CL in a plan view, the anchor bolt 4 in a state of being inserted into the lower washer eccentric hole 14a shown in FIG. The bolt contour line BOL that projects the outer shape of the bolt and FIG. 7 will be described.

FIG. 6B shows a state in which the center of the bolt contour line BOL is located at the center 14x of the lower washer 14 on the horizontal center line CL (first bolt position α). From this state, the contour line (hole edge) 14a2 passes through the center of the bolt contour line BOL on the horizontal center line CL, the eccentric position 14y, and the outer diameter of the anchor bolt 4 from the radius r21a of the bolt insertion hole 21a of the base plate 21. Each locus of the bolt contour line BOL up to the state (second bolt position β) when moved to the distance (= r21a-R4 / 2) obtained by subtracting 1/2 of R4 is placed below the horizontal center line CL. It has a contour shape drawn so as to surround all of them.

In the lower washer eccentric hole 14a of the first embodiment, the contour line (hole edge) 14a2 below the horizontal center line CL has the bolt contour line BOL (anchor bolt 4) at the first bolt position α and the second bolt position. In the state of being located at β, the first contour line connecting the intersections of the line hanging from the center of the bolt contour line BOL and the bolt contour line BOL, and both ends of the first contour line (each intersection). Each bolt has a contour shape consisting of a second contour line extending from the bolt contour line BOL along the circumference of the bolt contour line B to the horizontal center line CL in a direction away from each other. With such a shape, the effects described later can be obtained, but the shape is not particularly limited to the shape of the first embodiment, and each locus of the bolt contour line BOL described in the previous stage is defined as the horizontal center line CL. As long as the contour shape completely surrounds the lower side, the shape may be such that there is a space between each locus of the bolt contour line BOL and its inner peripheral surface.

Therefore, the lower seat metal 14 constituting the anchor bolt fixing bracket 1 of the first embodiment is anchored to the lower seat metal eccentric hole 14a so that the center of the bolt insertion hole 21a of the base plate 21 and the center 14x of the lower seat metal 14 coincide with each other. When the bolt 4 is inserted and installed, for example, as shown in FIG. 7, even when the anchor bolt 4 is located at the first bolt position α which is the center of the bolt insertion hole 21a, the anchor bolt 4 is also attached to the base plate 21. Even when the anchor bolt 4 is located at the second bolt position β that abuts on the inner peripheral surface of the bolt insertion hole 21a, the anchor bolt 4 further sets the first bolt position α around the eccentric position 14y that is the center of the lower seat metal eccentric hole 14a. Even when it is located at the third bolt position γ rotated by 90 degrees, the lower seat metal eccentric hole 14a can be inserted through the anchor bolt 4 without moving the lower seat metal 14 back and forth and left and right.

<Construction method of wooden column base structure using anchor bolt fixing bracket 1 of Embodiment 1>
A method of constructing a wooden column base structure using the anchor bolt fixing bracket 1 of the first embodiment configured as described above will be described.

First, the bolt insertion hole 21a of the base plate 21 of the wooden column base metal 2 is inserted into the anchor bolt 4 protruding from the upper surface of the foundation 5, and the wooden column base metal 2 is installed at a predetermined position on the foundation 5.

Next, the outer ring 11 and the inner ring 12 are fitted into the bolt insertion hole 21a of the base plate 21 into which the anchor bolt 4 is inserted so as to be in the state shown in FIG. 8A, for example. The order in which the outer ring 11 and the inner ring 12 are fitted may be the outer ring 11 and the inner ring 12 at the same time, or one of them may be fitted at the same time.

Here, the inner ring 12 is fitted into the bolt insertion hole 21a with the inner ring recess 12d formed on the bottom surface side of the inner ring 12 facing the upper surface side of the foundation 5. Then, the concrete slag adhering around the anchor bolt 4 directly above the upper surface of the foundation 5 is located in the recess of the inner ring recess 12d, so that there is a gap between the bottom surface of the inner ring 12 and the upper surface of the foundation 5. It becomes difficult to do. Therefore, it is prevented that the initial rigidity of the column base structure of the first embodiment in which the wooden column base metal fitting 2 is fixed to the anchor bolt 4 by the anchor bolt fixing metal fitting 1 of the first embodiment is prevented from being remarkably lowered, and the anchor bolt 4 is sheared and bent. It is possible to exhibit tenacious column base performance by surely deforming.

Next, the lower washer eccentric hole 14a of the lower washer 14 is inserted through the anchor bolt 4, and the lower washer 14 is placed on the upper surfaces of the outer ring 11 and the inner ring 12. At that time, the lower washer 14 is installed so that its center 14x is aligned with the center of the bolt insertion hole 21a as much as possible, and after that, the upper washer fixing recess 14b is on the upper side in order to mount the upper washer 13. Install.

In the case of the lower washer 14 of the first embodiment in which the upper washer fixing recess 14b is formed on the upper surface side, the center 14x of the lower washer 14 when the lower washer eccentric hole 14a is inserted into the anchor bolt 4 and installed. The inner peripheral surface of the contour line 14a1 of the semicircular lower washer eccentric hole 14a formed above the horizontal center line CL passing through the eccentric position 14y (see FIG. 6B) and the outer circumference of the anchor bolt 4. Install so that it is in contact with the surface. Therefore, the lower washer 14 is adjusted by rotating the installation position as necessary.

Finally, the upper washer eccentric hole 13a of the upper washer 13 is inserted into the anchor bolt 4, and the upper washer 13 is rotated on the upper surface of the lower washer 14 to be fitted into the upper washer fixing recess 14b of the lower washer 14. After that, as shown in FIG. 1 and the like, the nut 6 is screwed into the upper end of the anchor bolt 4 protruding from the upper surface of the upper washer 13 and tightened to complete the fixing operation.

8 (a) and 8 (b) show that when the column base metal fitting 2 and the anchor bolt 4 are fixed by using the anchor bolt fixing bracket 1 of the first embodiment, the anchor bolt 4 inserts the bolt of the base plate 21. An example of the positional relationship between the outer ring 11 and the inner ring 12 and the positional relationship between the upper seat 13 and the lower seat 14 when they are located at the first bolt position α (see FIG. 7), which is the center of the hole 21a, is shown. It is a figure.

When the anchor bolt 4 inserted into the bolt insertion hole 21a of the base plate 21 is located at the first bolt position α (see FIG. 7), the anchor bolt 4 is located at the center 14x of the lower washer 14, that is, the bolt insertion hole 21a. Since it protrudes from the center, the positional relationship between the outer ring 11 and the inner ring 12 inside the bolt insertion hole 21a is as shown in FIG. 8A, that the outer ring opening 11c and the inner ring 12 of the outer ring 11 have a positional relationship. The inner ring 12 is fitted into the outer ring opening 11c of the outer ring 11 with the inner ring openings 12a facing each other, and the anchor bolt 4 is inserted into the inner ring opening 12c.

Then, as shown in FIG. 8B, the lower washer 14 installed on the upper side of the outer ring 11 and the inner ring 12 is inserted into the anchor bolt 4 with the lower washer eccentric hole 14a, and the lower washer 14 is inserted. The center 14x is installed so as to coincide with the center of the bolt insertion hole 21a of the base plate 21. At this time, since the outer peripheral surface of the anchor bolt 4 is in contact with the inner peripheral surface (see FIG. 6B) of the contour line 14a1 of the semicircular lower washer eccentric hole 14a, the lower washer 14 is located. It is not necessary to rotate and adjust the installation position. After that, the upper washer 13 is rotated on the upper surface of the lower washer 14 and fitted into the upper washer fixing recess 14b of the lower washer 14, so that the lower washer 14 is fixed to the anchor bolt 4 and the position is fixed. Once decided, the installation work of the anchor bolt fixing bracket 1 is completed.

The cross section of the line EE in FIG. 8B is in the state shown in FIG. 1, and the lower washer eccentric hole 14a larger than the outer diameter R4 of the anchor bolt 4 has a space on the right side of the anchor bolt 4 in the drawing. It can be seen that is occurring.

9 (a) and 9 (b) show that when the column base metal fitting 2 and the anchor bolt 4 are fixed by using the anchor bolt fixing bracket 1 of the first embodiment, the anchor bolt 4 inserts the bolt of the base plate 21. The positional relationship between the outer ring 11 and the inner ring 12 when the bolt is located at the second bolt position β (see FIG. 7) in contact with the inner peripheral surface of the bolt insertion hole 21a with the maximum eccentricity in the hole 21a. It is a figure which shows an example of the positional relationship of the upper seat 13 and the lower seat 14.

When the anchor bolt 4 inserted into the bolt insertion hole 21a of the base plate 21 is located at the second bolt position β (see FIG. 7), the anchor bolt 4 is in contact with the inner peripheral surface of the bolt insertion hole 21a, that is, the anchor. Since the center of the bolt 4 is located on the distance obtained by subtracting 1/2 of the outer diameter R4 of the anchor bolt 4 from the radius r21a of the bolt insertion hole 21a in the horizontal direction in the plan view, the inside of the bolt insertion hole 21a As shown in FIG. 9A, the positional relationship between the outer ring 11 and the inner ring 12 is such that the outer ring opening 11c of the outer ring 11 and the inner ring opening 12a of the inner ring 12 face each other in the same direction. The inner ring 12 is fitted into the outer ring opening 11c of the outer ring 11, and the anchor bolt 4 is inserted through the inner ring opening 12c.

Also in this case, as shown in FIG. 9B, the lower washer 14 installed above the outer ring 11 and the inner ring 12 has a lower washer eccentric hole having a radial outer peripheral surface of the anchor bolt 4. Since the position is in contact with the inner peripheral surface of the contour line 14a1 of 14a (see FIG. 6B), the lower washer 14 is rotated to the installation position as in the cases of FIGS. 8A and 8B. You do not have to adjust.

The upper washer 13 is rotated on the upper surface of the lower washer 14 and fitted into the upper washer fixing recess 14b, so that the lower washer 14 and the upper washer 13 are fixed to the anchor bolt 4 and their positions are determined.

The cross section of the FF line in FIG. 9B is in the state shown in FIG. 10, and the lower washer eccentric hole 14a, which is larger than the outer diameter R4 of the anchor bolt 4, has a space on the left side of the anchor bolt 4 in the drawing. It can be seen that is occurring.

11 (a) and 11 (b) show, respectively, when the column base metal fitting 2 and the anchor bolt 4 are fixed by using the anchor bolt fixing bracket 1 of the first embodiment, the anchor bolt 4 is a bolt insertion hole of the base plate 21. It is a figure which shows an example of the positional relationship of the outer ring 11 and the inner ring 12 when it is located at the 3rd bolt position γ (see FIG. 7) in 21a, and the positional relationship of the upper seat 13 and the lower seat 14.

When the anchor bolt 4 inserted into the bolt insertion hole 21a of the base plate 21 is located at the third bolt position γ (see FIG. 7), the positional relationship between the outer ring 11 and the inner ring 12 inside the bolt insertion hole 21a is shown in FIG. As shown in 11 (a), when the outer ring opening 11c of the outer ring 11 is fitted in a state of facing rightward in the drawing, the inner ring 12 has the inner ring opening 12a in the upward direction in the drawing. The anchor bolt 4 is inserted into the outer ring opening 11c of the outer ring 11 and the anchor bolt 4 is inserted through the inner ring opening 12c.

Also in this case, as shown in FIG. 11B, the lower washer 14 installed above the outer ring 11 and the inner ring 12 has a semicircular lower washer eccentricity on the outer peripheral surface of the anchor bolt 4. Since it is located in contact with the inner peripheral surface (see FIG. 6 (b)) of the contour line 14a1 of the hole 14a, it is the same as in the cases of FIGS. 8 (a) and 8 (b) and FIGS. 9 (a) and 9 (b). In addition, it is not necessary to rotate the lower washer 14 to adjust the installation position. If the lower washer 14 is installed so that the outer peripheral surface of the anchor bolt 4 does not contact the inner peripheral surface of the contour line 14a1 of the lower washer eccentric hole 14a, the inner circumference of the semicircular contour line 14a1 is installed. By rotating the lower washer 14 so that the outer peripheral surface of the anchor bolt 4 is in contact with the surface and adjusting the installation position, the position state as shown in FIG. 11B is obtained.

The upper washer 13 is rotated on the upper surface of the lower washer 14 and fitted into the upper washer fixing recess 14b, so that the lower washer 14 and the upper washer 13 are fixed to the anchor bolt 4 and their positions are determined.

In FIGS. 12 (a) and 12 (b) and 13 (a) and 13 (b), the anchor bolts 4 are the first bolt position α, the second bolt position β and the third bolt shown in FIGS. 8 to 11, respectively. It is a figure which shows other example of the positional relationship of the outer ring 11 and the inner ring 12 when it is in a position different from the position γ, and the positional relationship of the upper washer 13 and the lower washer 14. Of course, even in these cases, the outer ring 11 and the inner ring 12 can be fitted together into the bolt insertion hole 21a of the base plate 21.

Further, also in the lower washer 14 installed on the outer ring 11 and the inner ring 12, the outer peripheral surface of the anchor bolt 4 is in contact with the inner peripheral surface of the contour line 14a1 of the semicircular lower washer eccentric hole 14a. Alternatively, the lower washer 14 is rotated to adjust the position so as to be in contact with the inner peripheral surface thereof, and the upper washer 13 is fitted into the upper washer fixing recess 14b of the lower washer 14 so as to the anchor bolt 4. The lower washer 14 and the upper washer 13 can be fixed.

<Effect of Anchor Bolt Fixing Bracket 1 of Embodiment 1>
Therefore, the anchor bolt fixing bracket 1 of the first embodiment has a crescent-shaped outer ring 11 and inner ring 12, and a lower washer 14 and an upper washer 13 installed on the outer ring 11 and the inner ring 12. The outer ring 11 has an outer peripheral surface 11a having a radius r11a substantially the same as the bolt insertion hole 21a formed in the base plate 21, and a position 11y eccentric from the center 11x of the outer peripheral surface 11a by a predetermined eccentric distance L1. The inner ring 12 has an outer ring opening 11c having an inner peripheral surface 11b having a radius r11b substantially the same as the outer peripheral surface 12a of the inner ring 12, and the inner ring 12 is substantially the same as the outer ring opening 11c of the outer ring 11. 1/2 of the outer diameter R4 of the anchor bolt 4 centered on the outer peripheral surface 12a having the same radius r12a and the position 12y eccentric from the center 12x of the outer peripheral surface 12a by the same distance L2 as the eccentric distance L1 of the outer ring 11. The lower washer 14 has an outer diameter larger than the inner diameter of the bolt insertion hole 21a formed in the base plate 21 and has an inner ring opening 12c having an inner peripheral surface 12b having a radius r12b substantially the same as that of the base plate 21. Only 1/2 of the outer diameter R4 of the anchor bolt 4 was subtracted from 1/2 of the value obtained by adding the radius r21a of the bolt insertion hole 21a and 1/2 of the outer diameter R4 of the anchor bolt 4 from the center 14x of the washer 14. The lower washer eccentric hole 14a centered on the position 14y eccentric by the eccentric distance L4, the upper washer 13 has an outer diameter smaller than the outer diameter of the lower washer 14, and the lower washer 13 has an outer diameter smaller than the outer diameter of the lower washer 13. The lower washer eccentric hole 14a has a circular upper washer eccentric hole 13a centered on the position 13y eccentric by the same eccentric distance L3 as the eccentric distance L4 of 14 and having an inner diameter substantially the same as the outer diameter R4 of the anchor bolt 4. The shape of the plan view is set to be larger than the outer diameter R4 of the anchor bolt 4 and smaller than the inner diameter of the bolt insertion hole 21a and the outer diameter of the upper washer, and further inserted into the lower washer eccentric hole 14a. From the state where the center of the bolt contour line BOL projecting the outer shape of the anchor bolt 4 is located at the center 14x of the lower washer 14, the bolt insertion hole of the base plate 21 is formed on the horizontal center line CL passing through the center 14x of the lower washer 14. Each locus of the bolt contour line BOL up to the state when the anchor bolt 4 is moved to a distance obtained by subtracting 1/2 of the outer diameter R4 of the anchor bolt 4 from the radius r21a of 21a is completely surrounded by the upper side and the lower side of the horizontal center line CL. It has a contour shape drawn as follows.

As a result, the anchor fixing bracket 1 can be easily attached to the anchor bolt 4 even in the box-shaped wooden column base metal fitting 2 having a limited space, and the anchor bolt 4 inserts the bolt of the base plate 21. Regardless of the position of the hole 21a, the lower washer 14 with its center 14x almost aligned with the center position of the bolt insertion hole 21a can be adjusted by rotating at most without moving it back and forth and left and right. It can be fixed to the anchor bolt 4 only by itself, and their workability is improved.

Further, in the anchor bolt fixing bracket 1 of the first embodiment, the shape of the lower washer eccentric hole 14a in a plan view is a position where the contour on the upper side of the horizontal center line passing through the center of the lower washer is eccentric by the eccentric distance of the lower washer. Since the anchor bolts 4 are formed as a center in a semicircular arc whose radius is 1/2 of the value obtained by adding the radius of the bolt insertion hole of the base plate and 1/2 of the outer diameter of the anchor bolt. , Not only when it is located at the center of the bolt insertion hole 21a or at a position where it abuts on the inner peripheral surface of the bolt insertion hole 21a, but also when the center of the bolt insertion hole 21a is centered at the eccentric position 14y of the lower washer eccentric hole 14a. Even when the lower washer 14 is rotated 90 degrees clockwise, the lower washer eccentric hole 14a can be inserted through the anchor bolt 4 without rotating the lower washer 14, and the insertion workability is further improved. ..

Further, in the anchor bolt fixing bracket 1 of the first embodiment, the shape of the lower washer eccentric hole 14a in a plan view is below the contour below the horizontal center line passing through the center of the lower washer, and the center of the bolt contour line is below. From the center of each bolt contour line when it is located at the center of the washer and when it is moved on the horizontal center line to a distance obtained by subtracting 1/2 of the outer diameter of the anchor bolt from the radius of the bolt insertion hole of the base plate. The first contour line connecting the intersections of the hanging lines and the bolt contour lines, and both ends of the first contour line extend to the horizontal center line in the direction away from each other along the circumference of the bolt contour line. Since it is formed in a contour shape consisting of a second contour line, it is possible to completely eliminate the possibility that the inner ring 12 will come out of the bolt insertion hole 21a when a force is applied to the column base portion, and the wooden column base can be completely eliminated. It is possible to surely exhibit the predetermined performance as.

As a result, according to the anchor bolt fixing bracket 1 of the first embodiment and the wooden column base structure using the anchor bolt fixing bracket 1, even if the box-shaped wooden column base metal 2 has a limited space, the bolt insertion hole of the base plate 21 is inserted. 21a can be formed with the largest possible diameter, and even if the anchor bolt 4 is maximally eccentric in the bolt insertion hole 21a, the lower seat metal 14 and the upper seat metal 13 and the like interfere with the wooden column base metal fitting 2. Instead, it can be fixed to the anchor bolt 4, so that the wooden column base metal fitting 2 can be reliably installed at a predetermined position.

Further, in the anchor bolt fixing metal fitting 1 of the first embodiment and the wooden column base structure using the anchor bolt fixing metal fitting 1, when the anchor bolt 4 and the wooden column base metal fitting 2 are fixed by using the anchor bolt fixing metal fitting 1, FIG. As shown in 10 and the like, a space is formed between the anchor bolt 4 and the inner peripheral surface (around the anchor bolt 4) of the lower washer eccentric hole 14a of the lower washer 14.

As a result, when a large force is applied to the column base due to an earthquake or the like, the upper washer 13 located on the upper side of the space is deformed in the out-of-plane direction and contributes to the toughness (tenacity) of the column base. Along with the elongation deformation of the bolt 4, the toughness of the column base can be secured as compared with the conventional case.

Further, in the anchor bolt fixing bracket 1 of the first embodiment and the wooden column base structure using the anchor bolt fixing bracket 1, the upper washer fixing recess 14b to be fitted when the upper washer 13 is installed is provided on the upper surface side of the lower washer 14, so that the upper washer is above. When the washer 13 is fitted into the upper washer fixing recess 14b, the lower washer 14 in which the lower washer eccentric hole 14b larger than the outer diameter R4 of the anchor bolt 4 is formed together with the upper washer 13 does not deviate from the installation position. , Can be fixed to the anchor bolt 4, and the work efficiency of the fixing work of the wooden washer base metal 2 is improved.

Further, in the anchor bolt fixing bracket 1 of the first embodiment and the column base structure using the anchor bolt fixing bracket 1, the inner ring recess 12d is provided on the bottom surface side of the inner ring 12 along the inner peripheral surface of the inner ring 12. Since it is difficult to create a gap between the bottom surface of the inner ring 12 and the top surface of the foundation 5, and the initial rigidity of the column base is not significantly reduced, the predetermined performance as a wooden column base should be fully exhibited. Can be done.

Embodiment 2.
Next, the anchor bolt fixing bracket 1'used for the wooden column base metal fitting of the second embodiment according to the present invention will be described. In the anchor bolt fixing bracket 1'of the second embodiment, the shape of the lower washer eccentric hole 14a'of the lower washer 14' is different from the shape of the lower washer eccentric hole 14a of the first embodiment, and the other configurations are the same. is there.

14 (a) and 14 (b) are a plan view of the lower washer 14'of the anchor bolt fixing bracket 1'of the second embodiment, and the bolt insertion hole 21a and the bolt insertion hole 21a when the lower washer 14'is installed on the base plate 21, respectively. It is a top view which shows the typical position of the anchor bolt 4 inserted into the lower washer eccentric hole 14a'.

The lower washer eccentric hole 14a'of the lower washer 14'of the anchor bolt fixing bracket 1'of the second embodiment has a circular shape as described later in plan view. The lower washer 14'of the second embodiment does not have to be provided with the upper washer fixing recess 14b'as in the case of the first embodiment.

As shown in FIGS. 14 (a) and 14 (b), the shape of the lower washer eccentric hole 14a'of the lower washer 14'is a horizontal center line CL passing through the center 14x' of the lower washer 14'. The contour line 14a1'of the lower washer eccentric hole 14a' on the upper side thereof is the same as that of the first embodiment, and the contour line 14a2'of the lower washer eccentric hole 14a' on the lower side is the contour line 14a1. It is formed in a line-symmetrical relationship with'. That is, the contour line 14a1'of the upper lower washer eccentric hole 14a'is the radius r21a (see FIG. 7) of the bolt insertion hole 21a of the base plate 21 from the center 14x' of the lower washer 14'and the outer diameter R4 of the anchor bolt 4. Centered on the eccentric position 14y'at a distance obtained by subtracting 1/2 of the outer diameter R4 of the anchor bolt 4 (see FIG. 7) from 1/2 of the value obtained by adding 1/2 of (see FIG. 7). , A half circle whose radius is 1/2 of the value obtained by adding the radius r21a (see FIG. 7) of the bolt insertion hole 21a of the base plate 21 and 1/2 of the outer diameter R4 (see FIG. 7) of the anchor bolt 4. It is formed in a circular arc. The contour line 14a2'of the lower washer eccentric hole 14a'is also formed into the same semicircular arc due to the line symmetry, and as a result, the lower washer eccentric hole 14a is formed by these two semicircular arcs. 'Is formed in a circular shape.

Since the lower washer 14'of the second embodiment has the same upper washer fixing recess 14b'as that of the first embodiment formed on the upper surface thereof, the lower washer eccentric hole 14a'is inserted into the anchor bolt 4 and installed. At that time, the lower washer 14'is appropriately rotated while aligning the center 14x'and the center of the bolt insertion hole 21a with the inner peripheral surface of the semicircular lower washer eccentric hole 14a'and the anchor bolt. Install so that it is in contact with the outer peripheral surface of 4. At that time, the lower washer eccentric hole 14a'of the second embodiment is different from that of the first embodiment, and the semicircular contour line 14a2' is also formed below the horizontal center line CL', that is, the overall shape is circular. Since the contour line of the anchor bolt 4 is formed, the portion to be brought into contact with the outer peripheral surface of the anchor bolt 4 may be not only the inner peripheral surface of the upper contour line 14a1'but also the inner peripheral surface of the lower contour line 14a2'. As a result, the amount of rotation of the lower washer 14'is small, so that the installation workability is further improved.

In the lower washer 14'of the second embodiment, for example, as shown in FIG. 14B, when each of the anchor bolts 4 is located at the first bolt position α which is the center of the bolt insertion hole 21a of the base plate 21. When the bolt insertion hole 21a is maximally eccentric and is located at the second bolt position β in contact with the inner peripheral surface of the bolt insertion hole 21a, the first bolt position α or the second bolt position β is set to the lower washer eccentric hole 14a. When located at the 3rd bolt position γ and the 4th bolt position δ rotated 90 degrees clockwise or counterclockwise around the eccentric position 14y, which is the center of the anchor bolt 4, the outer peripheral surface of the anchor bolt 4 is , Since it is located in contact with the inner peripheral surface of the contour line 14a1'and the contour line 14a2'of the semicircular lower washer eccentric hole 14a', it is not necessary to rotate the lower washer 14' to adjust the installation position. ..

Therefore, in the anchor bolt fixing metal fitting 1'of the second embodiment and the wooden column base structure using the anchor bolt fixing metal fitting 1', the same operation and effect as the anchor bolt fixing metal fitting 1 of the first embodiment and the wooden column base structure using the same can be obtained. At the same time, the contour line 14a2'of the lower washer eccentric hole 14a'on the horizontal center line CL'is also formed in a semicircular arc, so that the anchor bolt 4 is centered on the bolt insertion hole 21a. Even when the eccentric hole 14a'is rotated 90 degrees counterclockwise around the eccentric position 14y', the lower washer eccentric hole 14a'is inserted into the anchor bolt 4 without rotating the lower washer 14'. It can be installed and the insertion workability is further improved. Further, when installing the lower washer 14', when adjusting the inner peripheral surface of the lower washer eccentric hole 14a' and the outer peripheral surface of the anchor bolt 4 in contact with each other, the upper contour line 14a1'or the lower contour It suffices to bring it into contact with either of the inner peripheral surfaces of the wire 14, and as a result, the amount of rotation of the lower washer 14'is small, so that the installation workability is further improved.

Embodiment 3.
Next, the anchor bolt fixing bracket 1 "used for the wooden column base metal fitting of the third embodiment according to the present invention will be described. In the anchor bolt fixing bracket 1" of the third embodiment, the upper surface of the lower seat metal 14 "and the eccentric hole of the lower seat metal The shape of "14a" is different from that of the first and second embodiments, and the other configurations are the same.

15 (a) and 15 (b) are a plan view of the anchor bolt fixing bracket 1 "lower washer 14" of the third embodiment, and the bolt insertion holes 21a and the bolt insertion hole 21a when the lower washer 14 "is installed on the base plate 21, respectively. It is a top view which shows the typical position of the anchor bolt 4 inserted in the lower washer eccentric hole 14a ".

The shape of the lower washer eccentric hole 14a "of the anchor bolt fixing bracket 1" of the third embodiment is an elliptical shape as described later. Note that the lower washer 14 "is on the upper surface side. Is not provided with the upper washer fixing recess as in the first and second embodiments.

As shown in FIGS. 15 (a) and 15 (b), the shape of the lower washer 14 "lower washer eccentric hole 14a" in a plan view is a horizontal center line CL passing through the center 14x "of the lower washer 14". The contour line 14a2 "of the lower washer eccentric hole 14a" on the lower side thereof is the same as that of the first embodiment, and the contour line 14a1 "of the lower washer eccentric hole 14a" on the upper side is the contour line 14a2. It is formed in a line-symmetrical relationship with ". That is, the contour line 14a2 "of the lower washer eccentric hole 14a" is such that the center of the bolt contour line BOL that projects the outer shape of the anchor bolt 4 inserted through the lower washer eccentric hole 14a "is the lower washer 14". The outer diameter R4 of the anchor bolt 4 from the radius r21a of the bolt insertion hole 21a of the base plate 21 through the state of being located at the center 14x "(first bolt position α) and the eccentric position 14y" on the horizontal center line CL ". In the state when the bolt contour line BOL is moved to a distance obtained by subtracting 1/2 of the above (second bolt position β), the intersections of the lines hanging from the center of the bolt contour line BOL and the bolt contour line BOL are connected to each other. A contour shape consisting of one contour line and a second contour line extending from both ends (each intersection) of the first contour line to the horizontal center line CL "in the direction away from each other along the circumference of the bolt contour line BOL is formed. ing. The contour line 14a1 "of the upper lower washer eccentric hole 14a" also has the same contour shape due to the line symmetry, and as a result, the lower washer eccentric hole 14a "is formed into an elliptical shape by these two contour shapes. ing.

The lower washer 14 "of the third embodiment has a semicircular arc (inner peripheral surface) in which the contour line 14a1" and the contour line 14a2 "of the lower washer eccentric hole 14a" are different from those of the first and second embodiments. I don't have it. When the upper washer fixing recess is provided on the upper surface of the lower washer 14 ", the lower washer 13" is inserted into the anchor bolt 4 with the upper washer eccentric hole 13a "(not shown). Even if the upper surface of the washer 14 "is rotated, it does not fit into the upper washer fixing recess. In order to fit the upper washer 13 "into the upper washer fixing recess, the lower washer 14" must be moved back and forth and left and right, which may interfere with the side surface portion 22 of the wooden column base metal fitting 2. When the lower washer 14 "lower washer eccentric hole 14a" does not have a semicircular arc, for example, an elliptical shape, its upper surface needs to be flat.

However, even in the lower washer 14 "of the third embodiment, as shown in FIG. 15B, the anchor bolts 4 are located at the first bolt position α, which is the center of the bolt insertion holes 21a of the base plate 21, respectively. In this case, even if it is located at the second bolt position β that is maximally eccentric in the bolt insertion hole 21a and is in contact with the inner peripheral surface of the bolt insertion hole 21a, or at any other position in the bolt insertion hole 21a. However, the lower washer eccentric hole 14a "can be inserted into the anchor bolt 4 while the center 14x" is aligned with the center of the bolt insertion hole 21a by simply rotating the lower washer 14 "as appropriate. Therefore, the lower washer 14 can be determined at an appropriate position without interfering with the wooden column base metal fitting 2. After that, the upper washer 13 "is installed on the upper surface of the lower washer 14", and the nut 6 is screwed into the upper end of the anchor bolt 4 and tightened to complete the fixing operation.

Therefore, in the anchor bolt fixing bracket 1 "of the third embodiment and the wooden column base structure using the anchor bolt fixing bracket 1", the anchor bolt fixing brackets 1 and 1'of the above-described first embodiment and the second embodiment and the wooden column base structure using the same are used. In comparison with the above, although the action and effect of the upper washer fixing recess formed on the upper surface side of the lower washer cannot be obtained, the lower washer 4 is inserted at any position of the bolt insertion hole 21a of the base plate 21. By simply rotating 14 "without moving it back and forth and left and right, the center 14x" is aligned with the center position of the bolt insertion hole 21a, and the lower washer eccentric hole 14a "is inserted into the anchor bolt 4 and fixed. Therefore, the workability is improved as compared with the conventional case. As a result, the wooden column base metal 2 can be fixed to the anchor bolt 4 without interfering with the wooden column base metal 2, so that the wooden column base metal 2 can be reliably installed at a predetermined position.

Embodiment 4.
Next, the anchor bolt fixing bracket 1 "'" used for the wooden column base metal fitting of the fourth embodiment according to the present invention will be described. In the anchor bolt fixing bracket 1 "'of the fourth embodiment, the upper surface of the lower seat metal 14""and the upper surface of the lower seat metal 14""are described. The shapes of the upper surface and the lower surface of the upper seat metal 13'are different from those of the second embodiment and the first embodiment, and the other configurations are the same.

16 (a) to 16 (c) are a perspective view, a plan view, and a sectional view taken along line GG of the lower washer 14 "" constituting the anchor bolt fixing bracket 1 "" for the wooden column base metal fitting of the fourth embodiment, respectively. Is.

As shown in FIGS. 16A to 16C, the anchor bolt fixing bracket 1 "'lower washer 14"'of the fourth embodiment is viewed in a plan view like the lower washer 14'of the second embodiment shown in FIG. Although it has a circular lower washer eccentric hole 14a "', unlike the lower washer 14' in the second embodiment, the upper washer fixing recess 14b'is omitted.

The radius of the washer eccentric hole 14a "" of the lower washer 14 "" of the anchor bolt fixing bracket 1 "" of the fourth embodiment is the same as that of the washer eccentric hole 14a "of the lower washer 14" of the second embodiment shown in FIG. In addition, the eccentric position 14y "', which is the center of the lower washer eccentric hole 14a"', is separated from the center 14x "'of the lower washer 14"' by 1/2 of the outer diameter R4 (see FIG. 7) of the anchor bolt 4. The radius is 1/2 of the value obtained by adding the radius r21a (see FIG. 7) of the bolt insertion hole 21a of the base plate 21 and 1/2 of the outer diameter R4 (see FIG. 7) of the anchor bolt 4. It is an arc to be used.

17 (a) to 17 (c) are a perspective view, a plan view, and a sectional view taken along line HH of the upper washer 13'which constitutes the anchor bolt fixing bracket 1"'for the wooden column base metal fitting of the fourth embodiment, respectively. FIG. 18 is an enlarged bottom view of the upper washer 13'.

As shown in FIGS. 17 (a) to 17 (c) and 18, the upper washer 13'of the anchor bolt fixing bracket 1 "'" of the fourth embodiment is the first embodiment shown in FIGS. 5 (a) to 5 (c). Like the upper washer 13, the outer shape is circular, and the anchor bolt 4 can be inserted around the eccentric position 13y', which is eccentric from the center 13x' of the upper washer 13'by a predetermined eccentric distance L3. Anchor bolt eccentric hole 13a'with an inner diameter substantially the same as or slightly larger than the outer diameter R4 (see FIG. 7) is formed.

Then, as described above, since the lower washer 14 "'of the fourth embodiment omits the upper washer fixing recess 14b', as shown in FIG. 18, the upper washer 13'is not displaced from the lower washer 14"'. On the lower surface 13b'side of the upper washer 13', on the horizontal center line CL "'connecting the center 13x' of the upper washer 13' and the eccentric position 13y' which is the center of the upper washer eccentric hole 13a. The eccentric position 13y'is opposite to the center 13x'of the upper washer 13', and the radius of the lower washer eccentric hole 14a "'from the center 13x' of the upper washer 13". A virtual arc VA whose radius is 1/2 of the value obtained by adding the radius r21a (see FIG. 7) of the bolt insertion hole 21a of the base plate 21 and 1/2 of the outer diameter R4 (see FIG. 7) of the anchor bolt 4. A circular protrusion 13b1'is provided so as to be in contact with the outer surface.

Therefore, the center of the protrusion 13b1'of the upper washer 13', the center 13x' of the upper washer 13', and the eccentric position 13y', which is the center of the upper washer eccentric hole 13a', are located on the straight line CL "', that is, above. The protrusion 13b1'of the washer 13'is provided on the side opposite to the upper washer eccentric hole 13a'with respect to the center 13x' of the upper washer 13'. When the protrusion 13b1'of the washer 13'is fitted into the lower washer eccentric hole 14a"'of the lower washer 14 "', the upper washer 13'is fixed to the lower washer 14" "and does not rotate or move.

In the anchor bolt fixing bracket 1 "'of the fourth embodiment, the protrusion 13b1'is provided by pushing the upper surface 13c'side of the upper washer 13', which is the opposite side of the protrusion 13b1', toward the lower surface 13b'. Therefore, the recess 13c1'is formed on the upper surface 13b'side of the lower surface 13b' facing the protrusion 13b1'. However, the method of providing the protrusion 13b1'on the lower surface 13b' of the upper washer 13b'is the upper surface 13c' side. Not limited to extrusion from, a hole is made at the position of the protrusion 13b1'and a pin is driven in to provide the protrusion 13b1', or a protrusion 13b1'is provided by welding or the like, and further, by integrally molding with the upper washer 13'. Of course, the protrusion 13b1'may be provided.

Next, the positional relationship between the anchor bolt 14 and the upper washer 13'and the lower washer 14"'in the anchor bolt fixing bracket 1"'for the wooden column base hardware of the fourth embodiment will be described.

19 (a) to 19 (c) show the anchor bolts at the first bolt position α, the second bolt position β, and the third bolt position in the wooden column base metal anchor bolt fixing bracket 1 "', respectively. It is a figure which shows the positional relationship of the anchor bolt 14, the upper seat 13', and the lower seat 14"'when it is located at γ (see FIG. 7).

When the column base hardware 2 and the anchor bolt 4 are fixed by using the anchor bolt fixing bracket 1 "'of the fourth embodiment, if the anchor bolt 4 is at the first bolt position α (see FIG. 7), the anchor bolt No. 4 protrudes from the center 14x "'of the lower seat metal 14", that is, the center of the insertion hole 21a of the base plate bolt 21, so that the positional relationship between the outer ring 11 and the inner ring 12 inside the bolt insertion hole 21a Is as shown in FIG. 8 (a).

Then, as shown in FIG. 19A, the lower washer 14 "'installed on the upper side of the outer ring 11 and the inner ring 12 has the anchor bolt 4 inserted through the lower washer eccentric hole 14a" "and is lowered. The center 14x "'of the washer 14"'is installed so as to coincide with the center of the bolt insertion hole 21a of the base plate 21, and then the upper washer 4 is inserted into the upper washer eccentric hole 13a'of the upper washer 13'. Place 13'on the lower washer 14 "'.

At that time, unlike the lower washer 14'of the second embodiment, the lower washer 14 "'of the fourth embodiment omits the upper washer fixing recess 14b', but is on the lower surface 13b' side of the upper washer 13'. Is the radius of the lower washer eccentric hole 14a "" from the center 13x'of the upper washer 13'to the radius r21a (see FIG. 7) of the bolt insertion hole 21a of the base plate 21 and the outer diameter of the anchor bolt 4. Since the protrusion 13b1'is provided so that the outer surface is in contact with the virtual arc VA whose radius is 1/2 of the value obtained by adding 1/2 of R4 (see FIG. 7), the upper washer eccentric hole 13a'is provided. When the anchor bolt 4 is passed through and the protrusion 13b1'of the upper washer 13'is fitted into the lower washer eccentric hole 14a"'of the lower washer 14 "", the upper washer 13'is fixed to the lower washer 14 "'and rotates. Or will not move

FIG. 20 is a cross-sectional view taken along the line II in FIG. 19A, in which the anchor bolt 4 passes through the upper washer eccentric hole 13a'and the lower washer eccentric hole 13a'', and the protrusion 13b1'of the upper washer 13'. Can be seen to be fitted in the lower washer eccentric hole 14a "" of the lower washer 14 "".

On the other hand, when the column base metal fitting 2 and the anchor bolt 4 are fixed by using the anchor bolt fixing bracket 1 "'of the fourth embodiment, if the anchor bolt 4 is at the second bolt position β (see FIG. 7), The positional relationship between the outer ring 11 and the inner ring 12 in the bolt insertion hole 21a is as shown in FIG. 9A.

Then, as shown in FIG. 19B, the anchor bolt 4 is inserted into the lower washer eccentric hole 14a "" of the lower washer 14 "", and the upper washer eccentric hole of the upper washer 13 "is placed on the lower washer 14" ". When the protrusion 13b1'of the upper washer 13'is fitted into the lower washer eccentric hole 14a "'" while the anchor bolt 4 is inserted through the 13a', the upper washer 13'is fixed to the lower washer 14 "'. Will not rotate or move

FIG. 21 is a cross-sectional view taken along the line JJ in FIG. 19B, in which the anchor bolt 4 passes through the upper washer eccentric hole 13a'and the lower washer eccentric hole 13a "', and the protrusion 13b1'of the upper washer 13'. Can be seen to be fitted in the lower washer eccentric hole 14a "" of the lower washer 14 "".

Further, when the column base metal fitting 2 and the anchor bolt 4 are fixed by using the anchor bolt fixing bracket 1 "'of the fourth embodiment, if the anchor bolt 4 is at the third bolt position γ (see FIG. 7), the anchor bolt 4 is located at the third bolt position γ (see FIG. 7). The positional relationship between the outer ring 11 and the inner ring 12 in the bolt insertion hole 21a is as shown in FIG. 11A.

Then, as shown in FIG. 19 (c), the anchor bolt 4 is inserted into the lower washer eccentric hole 14a "" of the lower washer 14 "", and the upper washer eccentric hole of the upper washer 13 "is placed on the lower washer 14" ". When the protrusion 13b1'of the upper washer 13'is fitted into the lower washer eccentric hole 14a "'" while the anchor bolt 4 is inserted through the 13a', the upper washer 13'is fixed to the lower washer 14 "'. Will not rotate or move

Therefore, according to the anchor bolt fixing bracket 1 "'" of the fourth embodiment, the box-shaped wooden column base metal fitting 2 having a limited space is used in the same manner as the anchor bolt fixing brackets 1 to 1 "of the first to third embodiments. Even if there is, the anchor fixing bracket 1 can be easily attached to the anchor bolt 4, and no matter where the anchor bolt 4 is inserted into the bolt insertion hole 21a of the base plate 21, the bolt insertion hole 21a The lower washer 14 "" with its center 14x "" almost aligned with the center position can be fixed to the anchor bolt 4 by adjusting the installation position by rotation at best without moving it back and forth and left and right. Can be improved.

In particular, the anchor bolt fixing bracket 1 "'of the fourth embodiment has the same plan view and circular lower washer eccentric hole 14a" "as the lower washer 14' of the second embodiment, but the lower washer 14 of the second embodiment Since the upper washer fixing recess 14b'is omitted unlike', the center of the upper washer 13'is on the lower surface 13b' side of the upper washer 13' so that the upper washer 13'does not deviate from the lower washer 14''. On the horizontal center line CL connecting 13x'and the eccentric position 13y' which is the center of the upper washer eccentric hole 13a, and on the side opposite to the eccentric position 13y' with respect to the center 13x' of the upper washer 13'. The radius r21a (see FIG. 7) and the anchor bolt 4 of the bolt insertion hole 21a of the base plate 21, which is the radius of the lower washer eccentric hole 14a "" from the center 13x'of the upper washer 13'to the lower washer" ". A circular protrusion 13b1'is provided so that the outer surface is in contact with the virtual arc VA whose radius is 1/2 of the value obtained by adding 1/2 of the outer diameter R4 (see FIG. 7). ..

As a result, in the anchor bolt fixing bracket 1 "'" of the fourth embodiment, even if the upper washer fixing recess 14b "is omitted, the protrusion 13b1' on the lower surface 13b'side of the upper washer 13'is on the lower washer 14"'. Since the positioning function of the washer 13'is exhibited, the installation workability of the upper washer 13'can be improved as in the case of the upper washer fixing recess 14b'.

In the anchor bolt fixing bracket according to the present invention, the shape of the lower washer eccentric hole of the lower washer in a plan view is not limited to the above-described first to fourth embodiments, and as described above, the outside of the anchor bolt 4 It is set to be larger than the diameter R4 and smaller than the hole diameter of the bolt insertion hole 21a and the outer diameter of the upper washer 13, and the center of the bolt contour line BOL (anchor bolt 4) is the horizontal center line CL passing through the center. Above, from the state of being located at the center 14x of the lower washer 14 (first bolt position α), move to a distance obtained by subtracting 1/2 of the outer diameter R4 of the anchor bolt 4 from the radius r21a of the bolt insertion hole 21a of the base plate 21. The contour shape may be drawn so as to surround each locus of the bolt contour line BOL up to the state when the bolt is made (second bolt position β) on the upper side and the lower side of the horizontal center line CL.

Further, the outer shape of the lower washer and the upper washer is not limited to the circular shape as in the above-described first to fourth embodiments, and may be a quadrangle, a hexagon, an octagon, or other polygonal shape.

Further, in the wooden column base structure using the anchor bolt fixing brackets 1, 1', 1 ", 1"'according to the present invention, the box-shaped wooden column base metal fitting 2 used for the anchor bolt fixing brackets 1, 1', 1 ", 1"'is described in the above embodiments 1 to 4. An example has been described in which the side surface portions 22 are erected from three sides of the base plate 21 and one side surface is open to the outside, but the present invention is not particularly limited to this form, and at least the base plate 21 The side surface portions 22 may be erected from two opposing sides and may be shielded from the outside in either the front, rear, left or right direction.

1,1', 1 ", 1"'... Anchor bolt fixing bracket, 11 ... Outer ring, 11a ... Outer surface, 11b ... Inner peripheral surface, 11c ... Outer ring opening, 12 ... Inner ring, 12a ... Outer surface, 12b ... Inner peripheral surface, 12c ... Inner ring opening, 12d ... Inner ring recess, 13, 13'... Upper washer, 13a, 13a' ... Upper washer eccentric hole, 13b1' ... Projection, 14, 14', 14 ", 14 "'... Lower washer, 14a, 14a', 14a", 14a "'... Lower washer eccentric hole, 14b, 14b' ... Upper washer fixing recess, 2 ... Wooden column base hardware, 21 ... Base plate, 21a ... Bolt insertion hole , 22 ... side surface, 23 ... top surface, 3 ... wood column, 4 ... anchor bolt, 5 ... foundation, 6 ... nut.

Claims (8)

A box-shaped wooden column base metal with a wooden column attached to the upper surface, and one end protruding from the upper surface of the foundation and inserted into a bolt insertion hole larger than the diameter of the anchor bolt formed in the base plate of the wooden column base metal. Anchor bolt fixing bracket for fixing anchor bolts
The anchor bolt fixing bracket is
A plan view, a crescent-shaped outer ring and an inner ring, a lower washer installed on the outer ring and the inner ring, and an upper washer installed on the lower washer.
The outer ring
A radius substantially the same as the outer peripheral surface of the inner ring, centered on an outer peripheral surface having a radius substantially the same as the bolt insertion hole formed in the base plate and a position eccentric by a predetermined eccentric distance from the center of the outer peripheral surface. Has an outer ring opening with an inner peripheral surface consisting of
The inner ring
One of the outer diameters of the anchor bolts is centered on an outer peripheral surface having a radius substantially the same as the outer ring opening of the outer ring and a position eccentric from the center of the outer peripheral surface by the same distance as the eccentric distance of the outer ring. It has an inner ring opening with an inner peripheral surface having a radius approximately the same as / 2.
The lower washer is
It has an outer diameter larger than the inner diameter of the bolt insertion hole formed in the base plate, and is a value obtained by adding the radius of the bolt insertion hole and 1/2 of the outer diameter of the anchor bolt from the center of the lower washer. It has an eccentric hole for the lower washer centered on the position eccentric by the eccentric distance obtained by subtracting only 1/2 of the outer diameter of the anchor bolt from / 2.
The upper washer is
It has an outer diameter smaller than the outer diameter of the lower washer, and has an inner diameter substantially the same as the outer diameter of the anchor bolt centered on a position eccentric from the center of the upper washer by the same distance as the eccentric distance of the lower washer. Has a circular upper washer eccentric hole,
The shape of the lower washer eccentric hole in a plan view is
The outer diameter of the anchor bolt is set to be larger than the outer diameter of the anchor bolt and smaller than the inner diameter of the bolt insertion hole and the outer diameter of the upper washer, and further, the outer diameter of the anchor bolt in a state of being inserted into the lower washer eccentric hole. From the state where the center of the projected bolt contour line is located at the center of the lower washer, on the horizontal center line passing through the center of the lower washer, 1 / of the outer diameter of the anchor bolt from the radius of the bolt insertion hole of the base plate. It is characterized in that it has a contour shape drawn so as to surround each locus of the bolt contour line up to the state when it is moved to the distance obtained by subtracting 2 on the upper side and the lower side of the horizontal center line. Anchor bolt fixing bracket. In the anchor bolt fixing bracket according to claim 1,
The shape of the lower washer eccentric hole in a plan view is
At least, the radius of the bolt insertion hole of the base plate and the outer diameter of the anchor bolt are centered on a position where the contour on the upper side or the lower side of the horizontal center line passing through the center of the lower washer is eccentric by the eccentric distance of the lower washer. Anchor bolt fixing bracket characterized in that it is formed in a semicircular arc whose radius is 1/2 of the value obtained by adding 1/2 of. In the anchor bolt fixing bracket according to claim 2,
The shape of the lower washer eccentric hole in a plan view is
The other contour on the upper side or the lower side of the horizontal center line passing through the center of the lower washer is also centered on a position eccentric by the eccentric distance of the lower washer, and the radius of the bolt insertion hole of the base plate and the outer diameter of the anchor bolt. Anchor bolt fixing bracket characterized in that it is formed in a semicircular arc whose radius is 1/2 of the value obtained by adding 1/2 of. In the anchor bolt fixing bracket according to claim 2,
The shape of the lower washer eccentric hole in a plan view is
The other contour on the upper side or the lower side of the horizontal center line passing through the center of the lower washer, the state where the center of the bolt contour line is located at the center of the lower washer, and the state on the horizontal center line of the base plate. Connect the intersections of the lines hanging from the center of each bolt contour line and those bolt contour lines when they are moved to a distance obtained by subtracting 1/2 of the outer diameter of the anchor bolt from the radius of the bolt insertion hole. However, the contour shape is formed of the first contour line and the second contour line extending from both ends of the first contour line to the horizontal center line in a direction away from each other along the circumference of the bolt contour line. Anchor bolt fixing bracket featuring. In the anchor bolt fixing bracket according to any one of claims 2 to 4.
On the upper surface side of the lower washer,
Anchor bolt fixing bracket characterized in that an upper washer fixing recess set to a size in which the upper washer is fitted is formed centering on a position eccentric by the eccentric distance of the lower washer. In the anchor bolt fixing bracket according to claim 1,
On the lower surface side of the upper washer,
On a straight line connecting the center of the upper washer and the center of the eccentric hole of the upper washer, on the opposite side of the center of the upper washer from the eccentric hole of the upper washer, and below the center of the upper washer. Anchor bolt fixing bracket characterized in that a protrusion is provided so that the outer surface contacts a virtual arc having the same radius as the radius of the eccentric hole of the lower washer of the washer. In the anchor bolt fixing bracket according to any one of claims 1 to 6.
On the bottom side of the inner ring
Anchor bolt fixing bracket, characterized in that an inner ring recess having a radius larger than the radius of the inner ring opening is formed along the inner peripheral surface of the inner ring. A wooden column is attached to the upper surface, and one or two side surfaces are open to the outside to form a box-shaped wooden column base metal, and one end is projected from the upper surface of the foundation to form a base plate of the wooden column base metal. A wooden column base structure in which an anchor bolt inserted into a bolt insertion hole larger than the diameter of the anchor bolt is fixed by using the anchor bolt fixing bracket according to any one of claims 1 to 7. In the outer ring and the inner ring, the inner ring is fitted into the outer ring opening of the outer ring, and the anchor bolt is inserted into the inner ring opening of the inner ring. It is fitted inside the bolt insertion hole of the base plate.
The lower washer has the anchor bolt inserted into the lower washer eccentric hole of the lower washer, and the outer ring and the inner ring are in a state where the center of the lower washer is substantially aligned with the center of the bolt insertion hole of the base plate. The upper washer is installed on the lower washer with the anchor bolt inserted into the eccentric hole of the upper washer of the upper washer, and the upper surface of the upper washer is covered with the anchor bolt. A wooden column base structure using anchor bolt fixing brackets, characterized in that a screwed nut is fastened to the upper end of the anchor bolt.

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