JP3667961B2 - Joint structure between column base and foundation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connecting structure of a column base and a foundation of a house, particularly a load-bearing wall portion, by a wooden frame structure.
[0002]
[Prior art]
In a house with a wooden frame structure, the joint between the column base and the foundation is one of the extremely important parts in terms of the structural performance of the house. Even if the structure at the top of the house is reinforced with face materials and streaks, if the column base is not properly tied to the foundation or foundation, the house will be lifted or displaced in the event of an earthquake or storm. There is a danger to do. For this reason, in the verification of earthquake resistance after the Great Hanshin Earthquake, it is emphasized once again that the column base is pulled out from the bearing wall.
[0003]
As for the joint structure between the column base and the foundation that can exhibit a sufficient pulling-out strength in the load-bearing wall portion, the one described in Japanese Patent Laid-Open No. 8-184062 shown in FIG. 6 is already known.
[0004]
This is a “joining method” using the “connecting bracket 7” processed into a predetermined shape. A connecting fitting 7 having a cylindrical portion 71 through which the anchor bolt 21 planted in the foundation 2 can be inserted and reinforcing piece portions 72 extending on both sides thereof is attached to the anchor bolt 21 and fixed on the base 6 by fastening with a nut. Then, the column base 1 in which the counterbore hole 14 into which the metal fitting 7 is inserted, the slit 15 and the drift pin insertion hole 16 are processed in advance is attached to the metal fitting 7. Then, the drift pin 5 or the like is driven into the insertion hole 16 from the side surface of the column base 1 so that the drift pin 5 penetrates the fixing hole 73 provided in the reinforcing piece 72 of the metal fitting 7, and the anchor bolt 21. And the column base 1 are tightly coupled.
[0005]
Further, by making the inner diameter of the cylindrical portion 71 of the connection fitting 7 slightly larger than the outer diameter of the anchor bolt 21, it is possible to correct a positional shift between the column and the anchor bolt 21 due to poor construction accuracy. .
[0006]
[Problems to be solved by the invention]
With respect to the conventional technique, a cylindrical counterbore 14 into which the connection fitting 7 is inserted must be processed in advance at the lower end of the column base 1, and the cylindrical shape is accurately formed at the center of the end surface of the column base 1. It was troublesome to form the countersink hole 14.
[0007]
Further, since the inner diameter of the cylindrical portion 71 of the connection fitting 7 is slightly larger than the outer diameter of the anchor bolt 21 in order to correct the positional deviation between the column and the anchor bolt 21, the connection fitting 7 and the anchor bolt There was a possibility that the close contact with 21 became sweet and the upright stability when the column was mounted was deteriorated. In order to increase the range that can be corrected, it is necessary to further increase the inner diameter of the cylindrical portion 71 of the connection fitting 7 and also increase the inner diameter of the counterbore 14 that is processed into the column base 1. There is a possibility that the leg 1 is weak in terms of strength against compression.
[0008]
The present invention was made to improve the above-described problems in the prior art, and in the joining between the column base of the load-bearing wall portion of the wooden frame and the foundation, while ensuring sufficient pulling strength, An object of the present invention is to provide a joint structure that makes it easy to correct misalignment with an anchor bolt and is excellent in structural stability and workability.
[0010]
[Means for Solving the Problems]
The joining structure of the present invention is a joining structure of a foundation on which an anchor bolt is planted and a column base that is erected on the foundation via the anchor bolt and a joining metal fitting.
[0011]
The joint fitting is formed by a bottom plate provided with a large hole having an inner diameter sufficiently larger than the outer diameter of the anchor bolt, and a pair of upright plates provided on both side edges of the bottom plate and provided with pin insertion holes, respectively. A shape that can prevent rotation of the anchor bolt as a shaft by contacting the inner surface of the pair of upright plates on the bottom plate of the main body and having a long hole through which the anchor bolt is inserted. It consists of a formed washer.
[0012]
On the other hand, the column base has a pair of slits into which the upright plate of the joint fitting is fitted at the lower end portion thereof, a notch portion for receiving the upper end portion of the anchor bolt, and a pin insertion hole corresponding to the pin insertion hole of the upright plate. It is formed.
[0013]
Then, the main body of the joining metal fitting is placed on the top end of the foundation by inserting the anchor bolt through the large hole of the bottom plate, and the washer is stacked on the bottom plate of the main body while inserting the anchor bolt through the long hole. The bolt of the column base is fitted into the upright plate of the joining bracket fastened to the anchor bolt by tightening the nut and thus fixed to the top end of the foundation, and the pin member is driven from the pin insertion hole of the column base and the pin of the upright plate The column base is fastened to the foundation by passing through the insertion hole.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 shows an exploded state of a joint portion between the column base 1 and the foundation 2.
In the foundation 2, an anchor bolt 21 is planted in advance at the center of the column position, and an upper end portion of the foundation 2 protrudes from the top end of the foundation 2. On the other hand, the column is made of wood having a substantially square cross section, and is erected with the lower end of the column base 1 in direct contact with the top end of the foundation 2. In the present invention, the column base 1 and the foundation 2 are connected via an anchor bolt 21 and a joint fitting 3 fastened to the anchor bolt 21.
[0017]
The joint fitting 3 is composed of a main body 31 and a washer 36.
In the main body 31 of the joint fitting 3, two upright plates 34 are erected vertically and parallel to each other at opposite longitudinal edges of a rectangular bottom plate 32. The size of the bottom plate 32 is substantially the same as the size of a rectangle obtained by dividing the column cross-sectional shape into approximately three equal parts. A large hole 33 sufficiently larger than the diameter of the anchor bolt 21 is formed in the center of the bottom plate 32, and the anchor bolt 21 is inserted therethrough. The two upright plates 34, 34 are formed with two pin insertion holes 35, 35 at positions facing each other so that the pin members 5, 5 can be inserted therethrough.
[0018]
The washer 36 of the joint fitting 3 is a rectangular plate, the length of its long side is slightly larger than the inner length m of the two upright plates 34, 34 of the main body 31, and the length of its short side is It is formed slightly smaller than the inner method m. And the long hole 37 extended in the direction of a short side is formed in the center of the washer 36, and the anchor bolt 21 is inserted in this. Therefore, when the washer 36 is overlapped with the bottom plate 32 of the main body 31 and the anchor bolt 21 is inserted and tightened with the nut, the washer 36 is sandwiched between the two upright plates 34 and 34 and is rotated with the nut 4. Will be blocked.
[0019]
The main body 31 and the washer 36 of the joint fitting 3 are overlapped with the anchor bolt 21 inserted therethrough and fastened to the anchor bolt 21 by nut tightening. Here, the protruding height of the upper end portion of the anchor bolt 21 from the base 2 top end is set to the minimum necessary height obtained by adding the thickness of the nut 4 to the thickness of the main body 31 and the washer 36 of the joint fitting 3.
[0020]
On the other hand, at the lower end of the column base 1, slits 11, 11 and a notch 12 into which the joint fitting 3 is inserted are processed. The slits 11 and 11 are provided vertically and in parallel with each other at two locations that divide the lower end surface of the column base 1 into approximately three equal parts. And the space | interval and groove width of the slits 11 and 11 are formed so that it may become the same as the space | interval and thickness of the standing plates 34 and 34 of the joining metal fitting main body 31. FIG. The notch 12 is formed by notching the lower end portion of the column base 1 sandwiched between the two slits 11, 11, and the height thereof is the same as the protruding height of the upper end of the anchor bolt 21 from the base 2 top end. It is formed to be almost the same. Further, pin insertion holes 13 and 13 penetrating the column base 1 in the horizontal direction are formed in two places on the lower end side surface of the column base 1, and the pin members 5 and 5 are inserted into the holes respectively. .
[0021]
And the column base 1 is mounted | worn with the joining metal fitting 3 fastened by the anchor bolt 21, as shown in FIG. At this time, the pin insertion holes 35, 35 formed in the two upright plates 34, 34 of the joining metal fitting body 31 and the pin insertion holes 13, 13 formed in the column base 1 are respectively fitted to each other. The positions are aligned. Here, pin members 5, 5 such as drift pins are driven into the pin insertion holes 13, 13 from the side surface of the column base 1, and the column base 1 is penetrated through the pin insertion holes 35, 35 of the upright plates 34, 34. Tightened to the joint fitting 3. FIG. 3 shows a cross section of the joint portion.
[0022]
According to this joining structure, the pulling force applied to the column base 1 is transmitted from the pin members 5, 5 to the foundation 2 through the joining fitting 3 and the anchor bolt 21. Therefore, the shear strength of the lower part of the column base 1 can be ensured by setting the position of the pin members 5 and 5 at a certain distance or more from the lower end of the column base 1. However, the number of pin members 5 is determined according to the required shear strength in consideration of the thickness and strength of the pillars and pins, and therefore is not limited to two as in the above embodiment. Absent. In this way, a series of joint structures from the foundation 2 to the column base 1 through the anchor bolt 21 and the joint fitting 3 are completed, and sufficient pulling strength can be obtained.
[0023]
In addition, the joining metal fitting 3 is not limited to what is attached with the longitudinal direction facing the side surface direction of the foundation 2 as in the above embodiment, and may be attached with the longitudinal direction oriented in the extending direction of the foundation 2. . In that case, driving of the pin members 5 and 5 is from the side surface direction of the foundation 2, and it may be easier to work depending on the construction site.
[0024]
FIG. 4 shows another embodiment of the joining structure of the column base 1 and the foundation 2 according to the present invention. A base 6 is installed at the top end of the base 2, and anchor bolts 21 planted on the base 2 penetrate the base 6 and protrude from the upper surface of the base 6. As described above, when the column base 1 is erected on the upper surface of the base 6, the joining bracket 3 can be fastened to the anchor bolt 21 on the upper surface of the base 6 and the column base 1 can be connected in the same manner as described above. .
[0025]
And since each part is comprised by this joining metal fitting 3 with the simple shape without a curved surface part, while being easy to process itself, it is also easy to attach and position. Similarly, the shapes of the slits 11, 11 and the notch 12 that are processed into the column base 1 in conformity with the joint fitting 3 are also straight and simple, compared with the cylindrical counterbore 14 or the like in the prior art. The column base 1 can be easily processed.
[0026]
Further, since the bottom plate 32 of the joining metal fitting 31 is flat, the main body 31 comes into close contact with the top end of the foundation 2 when fastened to the anchor bolt 21. Therefore, the upright stability when the column base 1 is mounted and the column is erected is good.
[0027]
Subsequently, a correction function for a positional shift between the column base 1 and the foundation 2 will be described. FIG. 5 is a top view of the joining metal fitting 3 when the anchor bolt 21 is inserted through the main body 31 and the washer 36 of the joining metal fitting 3. However, the foundation, the column base, the nut and the like are not shown.
[0028]
(A) The figure shows the case where the anchor bolt 21 is planted at the center of the correct column position, and the centers of the anchor bolt 21, the large hole 33 of the main body 31, and the long hole 37 of the washer 36 match. Yes. (A) When the figure is a reference state, FIG. (B) shows a correction state when the anchor bolt 21 is displaced in the X direction with respect to the correct position in FIG. The insertion position of the anchor bolt 21 is adjusted using the length of 37. Further, FIG. (C) shows a correction state when the anchor bolt 21 is displaced in the Y direction with respect to the correct position of FIG. (A), and the anchor bolt 21 is inserted using the diameter of the large hole 33 of the main body 31. The position is adjusted. (D) The figure has shown the correction | amendment state in case the anchor bolt 21 has shifted | deviated compoundly in the X direction and the Y direction.
[0029]
In this way, by changing the insertion position of the anchor bolt 21 while shifting the overlap between the main body 31 and the washer 36, the position shift between the column and the anchor bolt 21 can be easily corrected. In addition, since the correctable range can be ensured up to about the diameter of the large hole 33 of the main body 31, the range is expanded compared to the conventional technique, and the correction work is facilitated.
[0030]
The shape of the washer 36 is not limited to a rectangle as shown in the above embodiment. If the end of the washer 36 is in contact with the two upright plates 34, 34 in a state where the washer 36 is sandwiched between the two upright plates 34, 34, the anchor bolt 21 is used as a shaft. Rotation of the washer 36 is prevented, and rotation during nut tightening is prevented. Therefore, the washer 36 may have a hexagonal shape, an octagonal shape, an oval shape, or the like. However, in order to appropriately obtain the above-described position correction function, the long hole 37 extends in a direction perpendicular to the two standing plates 34, 34 in a state where the washer 36 is in contact with the two standing plates 34, 34. It is desirable to be formed to extend.
[0031]
【The invention's effect】
In the joining structure of the present invention, the joining bracket is fastened to the anchor bolt, the joining bracket is inserted into the processed portion on the lower surface of the column base, the column base is mounted, and the pin member is driven from the pin insertion hole on the side of the column base. The column base is fastened to the joint metal by passing through the pin insertion hole of the joint metal. Therefore, the pulling force applied to the column base can be directly transmitted to the foundation, and sufficient pulling strength can be obtained.
[0032]
Moreover, since each part is formed with a simple shape with no curved surface part, this joining metal fitting is easy and economical, and is easy to attach and align. Similarly, the shapes of the slits and notches that are processed into the column base in conformity with the joint fitting are simplified, and the column base can be easily processed as compared with a conventional cylindrical counterbore hole or the like.
[0033]
Moreover, since the bottom plate of the joining metal fitting main body is a flat plate shape, the main body comes into close contact with the top end of the foundation when fastened to the anchor bolt. Therefore, the upright stability when the column base is installed and the column is erected is also good.
[0034]
In addition, a large hole is formed in the bottom plate of the joint metal fitting body, and a long hole extending in the short direction is formed in the approximate center of the washer, and the anchor bolt is inserted through the large hole and the long hole so as to fit, By changing the insertion position of the anchor bolt while shifting the overlap between the main body and the washer, it is possible to easily correct the positional deviation between the column and the anchor bolt. Further, the correction can be made in a wide range.
[0035]
In addition, since the washer of the joint metal fitting is formed in such a shape as to contact the inner surfaces of the two upright plates of the main body, the washer is overlaid on the bottom plate of the main body, and an anchor bolt is inserted to tighten the nut. At this time, a washer is sandwiched between the two upright plates to prevent rotation with the nut.
[0036]
Thus, it is possible to obtain excellent workability as well as structural stability.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a joining portion showing an embodiment of a joining structure between a column base and a foundation according to the present invention.
FIG. 2 is a perspective view showing a mounting state of the column base in the embodiment.
FIG. 3 is a cross-sectional view of a joint portion in the above embodiment.
FIG. 4 is a side view showing another embodiment of the joint structure according to the present invention.
FIG. 5 is a top view of a joint fitting showing a function of correcting the positions of columns and anchor bolts.
FIG. 6 is a perspective view showing an embodiment of a joining structure of a pillar and a foundation / base according to a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Column base 11 Slit 12 Notch part 13 Pin insertion hole 2 Base 21 Anchor bolt 3 Joint metal fitting 31 Main body 32 Bottom plate 33 Large hole 34 Standing plate 35 Pin insertion hole 36 Washer 37 Long hole 4 Nut 5 Pin member (drift pin)

Claims (1)

It is a joint structure between a foundation in which an anchor bolt is planted and a column base that is erected on the foundation via the anchor bolt and a joint fitting,
The joining bracket is composed of a bottom plate provided with a large hole having an inner diameter sufficiently larger than the outer diameter of the anchor bolt in the center, and a pair of upright plates respectively provided on both side edges of the bottom plate and provided with pin insertion holes. A shape that can prevent rotation around the anchor bolt by contacting the inner surface of a pair of upright plates on the bottom plate of the main body, and a long hole through which the anchor bolt is inserted. It consists of a washer formed on
On the other hand, the column base has a pair of slits into which the upright plate of the joint fitting is fitted at the lower end portion thereof, a notch portion for receiving the upper end portion of the anchor bolt, and a pin insertion hole corresponding to the pin insertion hole of the upright plate. Formed,
The main body of the joint fitting is placed on the top of the foundation with an anchor bolt inserted through the large hole in the bottom plate, and the washer is stacked on the bottom plate of the main body while inserting the anchor bolt into the long hole, and the main body and the washer are tightened with a nut. The slit of the column base is fitted to the upright plate of the joining bracket fastened to the anchor bolt in this way and fixed to the top end of the foundation, and the pin member is driven from the pin insertion hole of the column base and the pin insertion hole of the upright plate The joint structure between the column base and the foundation, wherein the column base is tightly coupled to the foundation by penetrating through the base.

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