JP6886279B2 - Column base structure, construction method of column base structure - Google Patents

Description

The present invention relates to a column base structure of a wooden column body and the like.

Currently, 95% of wooden buildings are houses, but national policy is promoting the conversion of public buildings to wood. For this reason, demand for medium- and large-scale wooden buildings is expected to increase. In such medium- and large-scale wooden buildings, hardware is used for the wooden column bases.

For example, using a substantially box-shaped column support member, the lower part is fixed to the foundation with anchor bolts, and the upper part has a column base structure fixed to a wooden column provided with a lug screw (Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2008-163652

In such a column base structure, a wooden column body and a column base metal fitting are usually joined at a factory or the like, a wooden pillar body is placed at the site, and then the column base metal fitting is fixed to a foundation or the like with anchor bolts. It will be constructed. At this time, since the anchor bolt is surrounded by the wall portion of the conventional column base hardware from the surroundings, the fixing workability of the anchor bolt is poor.

Further, in consideration of workability and cost, it is desirable that the column base hardware is as small as possible, but since the size of the conventional column base hardware is determined by the size of the column body, it has been difficult to achieve miniaturization.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a column base structure of a wooden column body having excellent construction workability.

In order to achieve the above-mentioned object, the first invention comprises a wooden pillar, a substantially rectangular upper plate joined to the lower end of the wooden pillar, a substantially rectangular lower plate fixed to a foundation, and the upper portion. A steel pipe for joining the plate and the lower plate is provided, and bolts for joining the upper plate and the wooden prism and anchor bolts for joining the lower plate and the foundation are outside the steel pipe, respectively. The lower plate is smaller than the size of the upper plate, and the number of anchor bolts is smaller than the number of bolts .

It is desirable that the threaded portion of the anchor bolt is a rolled screw.

According to the first invention, the upper plate and the lower plate are joined by a steel pipe, and the anchor bolts and the like are arranged on the outside of the steel pipe. Therefore, when tightening the anchor bolts and the like, the column base hardware and the operator's hand And interference with tools can be avoided. Therefore, the construction workability is good.

Further, by making the size of the lower plate smaller than the size of the upper plate, the upper plate can be made the same size as the wooden prism, and the lower plate can be made the minimum size in which the anchor bolts can be arranged. Therefore, the column base hardware can be miniaturized.

Further, if the threaded portion of the anchor bolt is a rolled screw, the elongation is large as compared with the case of a cutting screw, and a large plastic deformation performance can be ensured.

The second invention uses a column base metal fitting in which a substantially rectangular upper plate and a substantially rectangular lower plate smaller in size than the upper plate are joined by a steel pipe, and the upper plate of the column base metal is attached to the steel pipe. On the outside, bolted to the ends of the wooden pillars, the wooden pillars are placed on the foundation, the gap between the foundation and the lower plate is filled with mortar, and the mortar is cured. Later, the lower plate of the column base metal is fixed to the foundation by anchor bolts on the outside of the steel pipe, and the number of the anchor bolts is smaller than the number of the bolts . It is a construction method.

According to the second invention, the column base structure of a wooden column can be easily constructed.

According to the present invention, it is possible to provide a column base structure or the like of a wooden column body having excellent construction workability.

The side view which shows the column base structure 1. It is a side view which shows the column base structure 1, and is the A arrow view of FIG. (A) is a sectional view taken along line BB of FIG. 1, and (b) is a sectional view taken along line CC of FIG.

Hereinafter, the column base structure 1 according to the embodiment of the present invention will be described. 1 and 2 are side views showing the column base structure 1, and FIG. 2 is a view taken along the arrow A of FIG. The column base structure 1 is composed of a wooden column body 13, a column base hardware 21, an anchor bolt 9, and the like.

The column base metal fitting 21 is formed by joining the upper plate 3 and the lower plate 5 via a steel pipe 15. The upper plate 3 and the lower plate 5 are arranged substantially parallel to each other. Further, the substantially rectangular steel pipe 15 is joined to substantially the center of each of the upper plate 3 and the lower plate 5. The size of the steel pipe 15 (the length of each side of a substantially rectangular cross section) is equal to or less than the length of each corresponding side of the upper plate 3 and the lower plate 5. Therefore, the steel pipe 15 does not protrude from the upper plate 3 and the lower plate 5.

The upper plate 3 is arranged at the lower end of the wooden pillar 13. The size of the upper plate 3 is substantially the same as the size of the wooden pillar 13. A plurality of lug screws 11 are provided on the wooden pillar 13. The upper plate 3 is provided with a plurality of through holes, and the upper plate 3 and the wooden pillar 13 are fixed by bolts 17 using a lug screw 11.

The lower plate 5 is provided with a plurality of through holes. The plurality of anchor bolts 9 are inserted into the respective through holes of the lower plate 5 and fixed to the lower plate 5 by nuts. A mortar 7 is filled between the lower plate 5 and the concrete 19. The mortar 7 allows the horizontal and height of the lower plate 5 to be set accurately.

A fixing portion 23 is provided near the lower end of the anchor bolt 9. The fixing portion 23 is, for example, a plate-shaped member having a through hole, and the lower end of the anchor bolt 9 is inserted into the through hole of the fixing portion 23 and fixed with a nut. That is, the anchor bolt 9 is fixed to the concrete 19 which is the foundation.

The threaded portion of the anchor bolt 9 is preferably a rolled screw. For example, as the anchor bolt 9, it is desirable to apply a rolled anchor bolt approved by the Minister. Rolled screws exhibit greater elongation performance than cutting screws. Therefore, by using the rolled anchor bolt, it is possible to secure a larger deformation performance. In this case, it is desirable that the rolled anchor bolt has a threaded portion diameter larger than the shaft diameter. By doing so, the yield of the threaded portion of the anchor bolt 9 can be delayed.

FIG. 3A is a sectional view taken along line BB of FIG. 1, and FIG. 3B is a sectional view taken along line CC of FIG. The bolt 17 is arranged outside the steel pipe 15. In the illustrated example, a total of 16 bolts 17 are arranged, but the arrangement and number of bolts 17 (lag screws 11) are appropriately set according to the size of the wooden pillar 13 and the like.

Similarly, the anchor bolt 9 is arranged outside the steel pipe 15. In the illustrated example, a total of four anchor bolts 9 are arranged, but the arrangement and number of anchor bolts 9 are appropriately set according to the size of the wooden pillar 13 and the like.

Here, as described above, the upper plate 3 has substantially the same size as the wooden pillar body 13, and the number of lug screws 11 and bolts required for ensuring the rigidity of the column base portion of the wooden pillar body 13 is sufficient. It is fixed at 17. On the other hand, the fixing of the concrete 19 and the anchor bolt 9 is sufficiently stronger than the fixing of the lug screw 11 and the wooden pillar 13. Therefore, the number of anchor bolts 9 may be smaller than the number of lug screws 11 and the like.

Further, when an external force is applied to the wooden column 13 and a moment is applied to the column base, it is desirable that the anchor bolt 9 is yielded before the wooden column 13 is damaged. Therefore, the range in which the anchor bolts 9 are arranged can be narrower than the size of the wooden pillar 13. That is, the lower plate 5 can be smaller in size than the upper plate 3. The size referred to here is the area obtained by multiplying the vertical and horizontal lengths of each plate.

Next, the construction method of the column base structure 1 will be described. First, the upper plate 3 and the lower plate 5 are joined via the steel pipe 15 to prepare the column base metal fitting 21.

Next, the upper plate 3 of the column base hardware 21 is joined to the end of the wooden column 13. At this time, a plurality of lug screws 11 are arranged in advance inside the wooden pillar 13. When the wooden pillar 13 and the upper plate 3 face each other, a through hole is formed at a position corresponding to the lug screw 11 of the upper plate 3. Therefore, the bolt 17 is inserted into the through hole, and the bolt 17 is tightened on the outside of the steel pipe 15.

Next, the wooden pillar 13 to which the pillar base hardware 21 is joined is transported to the site, and the wooden pillar 13 is placed on the foundation (concrete 19). At this time, the anchor bolts 9 are embedded and fixed in the concrete 19 in advance, and the upper end of the anchor bolts 9 exposed on the upper surface of the concrete 19 is inserted into the through hole of the lower plate 5. If necessary, a spacer (not shown) is placed on the upper surface of the concrete 19, and the lower plate 5 is placed on the spacer to secure a gap between the concrete 19 and the lower plate 5. it can.

Next, the gap between the concrete 19 and the lower plate 5 is filled with the mortar 7. After the mortar 7 is hardened, the nut is tightened to the anchor bolt 9 on the outside of the steel pipe 15, and the lower plate 5 of the column base metal fitting 21 is fixed to the concrete 19. As described above, the column base structure 1 is constructed.

As described above, according to the present embodiment, since the bolt 17 to be tightened when fixing the upper plate 3 is located on the outside of the steel pipe 15, the steel pipe 15 and the operator's hand or tool are used when tightening the bolt 17. Can be prevented from interfering with each other.

Similarly, when fixing the anchor bolt 9, the anchor bolt 9 is arranged on the outside of the steel pipe 15, so that it is possible to prevent the steel pipe 15 from interfering with the operator's hand or tool when tightening the nut. Can be done.

Further, when a moment is applied to the column base structure 1, the anchor bolt 9 for fixing the lower plate 5 rather than the wooden column 13 being damaged (for example, the wooden column 13 is cracked at the portion of the lug screw 11). By performing the surrender first, damage to the wooden pillar 13 can be suppressed.

Further, since the number of anchor bolts 9 can be reduced and the anchor bolts 9 can be arranged in the vicinity of the central portion of the lower plate 5, the lower plate 5 can be made smaller. Therefore, the column base structure 1 can be miniaturized, and the cost can be reduced by reducing the materials used.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention does not depend on the above-described embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1 ………… Reinforcement structure of pillar 3 ………… Upper plate 5 ………… Lower plate 7 ………… Mortal 9 ………… Anchor bolt 11 ………… Rug screw 13 ………… Wooden pillar 15 ………… Steel pipe 17 ……… Bolt 19 ………… Concrete 21 ……… Pillar base hardware 23 ……… Fixing part

Claims (4)

With wooden pillars
A substantially rectangular upper plate joined to the lower end of the wooden prism,
An approximately rectangular lower plate that is fixed to the foundation,
A steel pipe that joins the upper plate and the lower plate,
Equipped with
The bolts that join the upper plate and the wooden prism and the anchor bolts that join the lower plate and the foundation are arranged outside the steel pipe, respectively .
The size of the lower plate is smaller than the size of the upper plate,
A column base structure characterized in that the number of anchor bolts is smaller than the number of bolts. The column base structure according to claim 1 , wherein a mortar is filled between the lower plate and the foundation. The column base structure according to claim 1 or 2, wherein the threaded portion of the anchor bolt is a rolled screw. Using a column base metal fitting in which a substantially rectangular upper plate and a substantially rectangular lower plate smaller in size than the upper plate are joined by a steel pipe.
The upper plate of the column base hardware is joined to the end of the wooden column by a bolt on the outside of the steel pipe.
The wooden prism is placed on the foundation and the gap between the foundation and the lower plate is filled with mortar.
After the mortar is hardened, the lower plate of the column base metal fitting is fixed to the foundation by anchor bolts on the outside of the steel pipe.
A method for constructing a column base structure, characterized in that the number of anchor bolts is smaller than the number of bolts.

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