JPH08184062A - Method for joining column with groundsill-foundation - Google Patents

Abstract

PURPOSE: To provide a high connecting strength by transmitting a tightening force of an anchor bolt of a foundation to a column through a connection fitting. CONSTITUTION: In order to join a column with a groundsill.foundation, a connection fitting 3 consisting of a cylindrical part for insertion of an anchor bolt 6 and reinforcing piece parts extending along the opposite sides of the cylindrical part is mounted onto the anchor bolt 6 which is provided through a goundsill 2 and fixed by means of a nut to fix the fitting 3 on the groundsill 2. And thereafter a column 1, in which a slit 17 for the reinforcing piece parts, a hole 18 for insertion of the cylindrical part, and holes 7 for insertion of drift pins are formed beforehand in an end of the column 1 to insert the fitting 3, is mounted onto the fitting 3. The drift pins 8 are driven into fixing holes provided in the reinforcing piece parts of the fitting 3 from the side of the column 1 to tightly connect the fitting 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a pillar, a base and a foundation of a load bearing wall portion of a wooden building.

[0002]

2. Description of the Related Art Generally, a method of joining a base and a pillar of a load bearing wall portion of a wooden building is as shown in FIG. After making the convex processing of the dowel processing on the part, and inserting and fixing the convex processing port to the concave processing port of the dowel processing, T type metal fitting 2
3, L-shaped metal fittings 22, I-shaped metal fittings 24 and the like. The force applied to the joint in this case is
Although the compressive force and the tensile force are the main ones, the resistance force to the tensile force especially depends on these metal fittings, and it was insufficient to obtain a certain strength or more. In addition, when the binding force between the base and the pillar is obtained by the conventional joining method, especially when a tensile force is applied, the metal fitting itself may be deformed or the base may be split and fracture from the part of the nail driven to fix the metal fitting. It was not possible to obtain sufficient proof strength. In FIG. 6, 10 is a foundation, 11 is an anchor bolt for fixing the base 2, 20 is a brace, and 21 is a beam.

[0003]

[Problems to be Solved by the Invention] Therefore, there is a method of joining a column and a foundation / foundation that strengthens the binding force between the foundation / foundation and the column, is strong against tensile force, and does not cause split fracture in the column or the foundation. There was a strong demand.

[0004]

A method of joining a pillar to a base / foundation according to the present invention is a cylinder in which the anchor bolt can be inserted into one anchor bolt penetrating the base in joining the pillar to the base / foundation. Column and a reinforcing metal piece that extends on both sides of the cylindrical portion are attached to the metal fitting to fix the metal fitting on a base by nuts, and then the end portion is preliminarily processed for inserting the metal fitting. Is mounted by inserting a connecting metal fitting into the end portion of the processed pillar, and a drift pin or the like is driven from the side surface of the pillar into the fixing hole provided in the reinforcing piece portion of the metal fitting to be tightly connected. Is the way to do it.

In the present invention, the hole provided in the base for inserting the anchor bolt and the inner diameter of the cylindrical portion of the connecting metal fitting are set to be slightly larger than the outer diameter of the anchor bolt so that the positions of the pillar and the anchor bolt to be joined are increased. Even if there is a slight deviation in position, the anchor bolts can be moved in the holes in the radial direction of the holes to correct the positional deviation between the pillar to be fixed and the anchor bolt. The mounting of the column on the metal fitting for connection is not particularly limited, but it is preferable that the surface of the reinforcing piece of the metal fitting be parallel to the length direction of the base.

The present invention also relates to a connecting fitting used in the joining method. As described above, the metal fitting for column base is composed of a cylindrical portion having an inner diameter through which the anchor bolt can be inserted and plate-like reinforcing piece portions extending on both sides of the cylindrical portion, and fixed to the reinforcing piece portion. It is characterized by having a hole for use. The cylindrical portion through which the anchor bolt is inserted preferably has a shape that slightly protrudes from the plate-shaped reinforcing piece portion that extends on both sides of the cylindrical portion, and is particularly long so that the base / foundation side protrudes. It may be shaped so that the protrusion can be inserted into a hole for an anchor bolt provided in the base. Further, for the purpose of correcting the positional deviation between the pillar and the anchor bolt, the inner diameter of the cylindrical portion for inserting the anchor bolt may be larger than the outer diameter of the anchor bolt so that the anchor bolt can be loosely fitted.

[0007]

That is, when the joining method of the present invention is used, the pulling-out proof stress of the anchor bolt embedded in the foundation can be transmitted to the column as it is, so that the foundation is not split and the column and the metal fitting are fixed. By keeping the position of the drift pin, etc. at a certain distance or more from the end of the column, cracks will not easily occur in the column, and adequate pull-out strength can be obtained by adjusting the pin diameter and pin end distance appropriately. it can. In the joining according to the present invention, a stress causes a series of force flows through the connecting metal fitting, and the binding force of the anchor bolt of the foundation is directly transmitted to the column, so that sufficient yield strength is obtained.

In the connection between the pillar and the base, the anchor bolt of the foundation is passed through the base as it is to be tightly connected to the pillar so that the base is not split. In this case, the number of anchor bolts is one, and the diameter and the embedding length satisfy the necessary pulling strength. The anchor bolt and the connection part of the pillar have a metal fitting for connection, and this fastener has a cylindrical anchor bolt tightening part so that the pillar can be installed at the planned position even if the installation position of the anchor bolt is slightly displaced. ,
The position of the anchor bolt can be adjusted in this cylindrical portion, and thereby the misalignment can be corrected.

The pillar and the connecting metal fitting are joined together by inserting the metal fitting fixed on the base into the end of the pillar and mounting the pillar and then driving a drift pin or the like. The diameter, the number, and the end distance of the drift pin etc. are determined by an experiment for determining the flexure and shear strength, and are determined in consideration of workability and cost of material processing. By inserting the fittings tightened on the base into the end of the pillar and hitting the drift pin etc., a series of connections of the foundation, base and pillar are completed, and the tightening force of the anchor bolt of the foundation is the fitting It will be transmitted to the pillar through the, and strong pull-out proof strength can be obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of connecting a pillar and a base as an embodiment of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 1, a base 2 having holes 9 through which the anchor bolts penetrate is placed on a base 10 in which anchor bolts 6 having a length capable of penetrating the base 2 are previously implanted. By setting the diameter of the hole 9 to an appropriate size as compared with the outer diameter of the anchor bolt 6, the base 2 and the pillar 1 can be attached even if the construction position of the anchor bolt 6 is slightly displaced. At this time, also consider the strength of the foundation.
Further, in this case, the diameter of the anchor bolt 6 is selected so that an effective pulling strength can be obtained. For example, M16 or more is desirable from the experimental results.

After the base 2 is placed on the base 10 and the position is determined, the base 2 is fixed to the base 10 by the anchor bolts 11 for fixing at the portion on the base 2 where the load bearing wall cannot be attached. Prevent misalignment. In FIG. 3, the connecting fitting 3 has a shape in which a cylindrical portion 14 and a reinforcing plate portion 15 of a flat plate are combined, and the cylindrical portion 14 has a reinforcing piece portion 15.
Lengthen slightly downward. This lengthened portion is used to prevent displacement when the connecting fitting is fixed to the base 2. The outer diameter of the cylindrical portion 14 is determined in consideration of the diameter of the anchor bolt 6 and the diameter of the base through hole 9, and is slightly smaller than the base through hole 9. In addition, in the case of this example, the reinforcement piece has two holes 16 for inserting the drift pin.
There are open places.

The anchor bolt 6 penetrating the through hole 9 of the base 2 is inserted into the cylindrical portion 14 of the connecting fitting 3, and the washer 4 and the nut 5 are fastened to fix the fitting 3. The washer 4 may have a step or a protrusion that does not shift from the cylindrical portion 14, or may be fixed to the cylindrical portion 14 by welding or the like. The protruding length of the anchor bolt 6 from the base listing is set in consideration of the height of the cylindrical portion 14 of the connecting fitting 3 and the thickness of the washer 4 and the nut 5.

Here, the anchor bolt 6 passes through the inside of the cylindrical portion 14, and depending on the inner diameter of the cylindrical portion 14 and the diameter of the through hole 9 of the base, the working position of the anchor bolt 6 and the planned working position of the pillar 1 are determined. It can be installed even if it is slightly misaligned. However, if the diameter of the through hole 9 is too large, it will be a disadvantageous condition for the base 2 to be set in, and the position correction of the anchor bolt 6 will be limited. Is desirable.

It is advantageous that the lower end portion of the pillar 1 is previously processed in a factory or the like for inserting the connecting metal fitting. This processing shape is such that the slit 17 having a width into which the reinforcing piece portion 15 of the connection fitting 3 is inserted divides the end face into two equal parts at the lower end face of the column and is parallel to one plane of the column. The circular countersinking hole 18 that is machined to a certain depth upward from the lower end surface and into which the cylindrical portion 14 is inserted has the center of the lower end surface of the post as the center of the counterboring hole 18, and is tightened from the depth of cut of the slit 17. Process deeper by the amount of the nuts for use.

The processing position of the hole 7 for inserting the drift pin 8 in the lower part of the column is selected within a range where the necessary shear strength can be obtained according to the strength and diameter (thickness) of the material of the pin 8.
For example, when the diameter of the pin 8 is D, it is preferably 7D or more from the lower end surface of the column 1. The required shear strength in this case is set to the same level as the tensile strength of the anchor bolt 6.

The number of the drift pins 8 is determined within a range in which the required shear strength can be obtained according to the strength and diameter (thickness) of the pins, etc., but in consideration of processing labor and on-site construction labor. It is better not to have so many, and it is preferable that the number is two. The pillar 1 having the pillar lower end processed for inserting the fitting is mounted on the fitting 3 for fixing fixed on the base 2, and then the fitting 3 and the pillar 1 are fixed by driving the drift pin 8 or the like. Pillar 1 and base 2 joined in this way
With, the binding force of the anchor bolt 6 of the foundation 10 is transmitted to the pillar 1 through the connecting metal fitting 3, and a strong pulling-out yield strength can be obtained. FIG. 2 shows a state in which the pillar 1 and the base 2 are connected. Also, the base 2 and foundation 1 other than the bearing wall part
The connection of 0 is the same as the conventional wooden frame construction method, the anchor bolts 11 for fixation are embedded at appropriate positions and intervals, and the washer 12 and the nut 13 are used for tight connection.

The connecting metal fitting may be manufactured by integrally forging the cylindrical portion and the reinforcing piece portion, or as shown in FIG. 4, by processing a metal plate into two parts. However, these pieces 3a and 3b may be integrally formed by an appropriate means such as pressure welding or joining with an adhesive. The reinforcing piece portion of the connecting fitting can be a plate having an arbitrary thickness and is usually made to have the same width as the pillar, but may have a width narrower than the width of the pillar. In addition, as shown in FIG. 5, the reinforcing piece 15 may be formed on the side surface of the pillar 1 as required.

[0019]

The present invention is a joining method characterized in that the binding force of the anchor bolt of the foundation is transmitted to the column via the connecting metal fitting. As in the conventional method, the pulling-out force of the column can be directly transmitted to the foundation without causing splitting fracture in the base. Calculating the pull-out proof strength from the in-plane shear test of the load-bearing wall has the advantage that the pull-out proof strength is about 3 times that of the conventional joint using T-shaped metal fittings. As a method of tightening, the work at the construction site is relatively easy and has many advantages in terms of strength and workability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a joined state of the embodiment of FIG.

FIG. 3 is a partially cutaway side view showing a joined state of the embodiment of FIG.

FIG. 4 is a perspective view showing an example of a metal fitting for connection.

FIG. 5 is a side view showing another example of the connecting fitting.

FIG. 6 is a side view showing an example of connection between a conventional pillar and a base.

[Explanation of symbols]

 1 Pillar 2 Base 3 Connection fitting 4 Washer 5 Nut 6 Anchor bolt 7 Drift pin insertion hole 8 Drift pin 10 Foundation 11 Anchor bolt for fixing 14 Cylindrical part of connection fitting 15 Reinforcing piece part of connection fitting 17 Reinforcing piece part Slit 18 countersunk hole (insertion hole for cylindrical part)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhide Segawa 324-611 Kamio, Aso-ku, Kawasaki-shi, Kanagawa Prefecture (72) Inventor Masahiro Inayama 5-11-8-403 Sakainan-cho, Musashino-shi, Tokyo

Claims (5)

[Claims] 1. When connecting a pillar to a base / foundation, an anchor bolt penetrating the base is provided with a fitting for connection comprising a cylindrical portion through which the anchor bolt can be inserted and reinforcing pieces extending on both sides of the cylindrical portion. Then, fix the metal fittings on the base by tightening nuts, and then attach the pillars whose ends are processed in advance for inserting the metal fittings to the metal fittings, and fix the fitting holes in the reinforcing piece parts of the metal fittings. A method of joining a pillar to a base / foundation, which is characterized in that a drift pin or the like is driven in from the side surface of the pillar to be tightly connected. 2. The position of the pillar to be joined and the position of the anchor bolt are made to be slightly larger than the outer diameter of the anchor bolt by making the inner diameter of the hole in the base for inserting the anchor bolt and the cylindrical portion of the connecting metal fitting larger than the outer diameter of the anchor bolt. The joining method according to claim 1, wherein the joining is possible. 3. A connection between a column and a base / foundation, which comprises a cylindrical portion having an inner diameter through which the anchor bolt can be inserted and plate-like reinforcing piece portions extending on both sides of the cylindrical portion. Metal fittings for connecting column bases. 4. The cylindrical portion into which the anchor bolt is inserted has a shape that is longer than at least the base / foundation side of a plate-shaped reinforcing piece extending on both sides of the cylindrical portion. The column base connection fitting according to claim 3. 5. The column base connection according to claim 3, wherein the inner diameter of the cylindrical portion for inserting the anchor bolt is larger than the outer diameter of the anchor bolt so that the anchor bolt can be loosely fitted. Metal fittings.