JP2002356915A - Base isolation structure of wooden building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation structure of a wooden building capable of withstanding strong vibration while fully utilizing an advantage of a structure that a wooden structural member inserted into a cylindrical part of a joining member is fixed to the joining member by a bolt in a skeleton structure of the wooden building using at least two adjacent wooden structural members and the joining member having at least two cylindrical parts allowing end parts of the structural members to be inserted therein, respectively, as basic configuration elements. SOLUTION: The structural members 1 and the joining member 2 are fixed by utilizing a bolt 3 passing through the joining member 2 and the structural members 1 to fix the structural members 1 to the joining member 2 while the end parts of the structural members 1 are inserted into the cylindrical parts 21 of the joining member 2. A base isolation part X capable of absorbing the vibration that the building 100 receives is formed between the bolt 3 and the structural member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure for a wooden building such as a wooden house.

[0002]

2. Description of the Related Art In a conventional frame construction method for a wooden building, a wooden structural member such as a column extending in a vertical direction and a wooden structural member such as a beam extending in a horizontal direction are connected to each other by a joint or a joint. Adhering to a rectangular frame body, and fixing a plate-like or column-shaped wooden bracing at the diagonal position of the rectangular frame body with nails, etc., while reinforcing it, adopting a construction method that forms a frame structure such as a wall Have been. However, in such a conventional construction method, since the structural member itself is made of wood, when it is dried, it contracts and loosens with the reinforcing metal. Therefore, even if reinforcement is applied, it tends to be incomplete, and it is extremely difficult to repair it after the building is completed. And may shift between the upper and lower floors that use the tube columns. Furthermore, since the structural members and bracing except for the joints are made of wood, there is a problem that it is difficult to standardize industrially with such a conventional construction method.

In order to solve such a problem, a metal joining member having a plurality of tubular portions is used, and ends of two or more wooden structural members adjacent to the joining member are respectively attached to the tubular portions. And a frame structure of a wooden building in which the joining member and the wooden structural member inserted into the cylindrical portion are fixed with bolts. With such a structure, it is possible to assemble with high precision without causing a decrease in strength, and to provide a wooden structure that can be easily industrially standardized, and to easily construct a wooden structure using the wooden structure. Various advantages can be obtained.

[0004]

When a wooden building as described above, in which a wooden member and a metal member are mixed, receives a strong vibration due to an earthquake, a strong wind, or the like, the vibration is made of a metal material more than a wooden member. It tends to be easily transmitted to the member. That is, when a wooden building having the above-described structure in which the wooden structural member inserted into the cylindrical portion of the joining member is fixed to the joining member by bolts receives strong vibration, the metal bolts come into close contact with the wooden structural member. Therefore, the vibration transmitted to the bolt may loosen or crack the portion of the wooden structural member into which the bolt is inserted, in some cases. This may lead to deterioration or collapse of the wooden building.

[0005] Therefore, in order to solve the above-mentioned problems, the present invention takes full advantage of the structure in which a wooden structural member inserted into a cylindrical portion of a joining member is fixed to the joining member by bolts, while providing strong vibration. It is an object of the present invention to provide a seismic isolation structure for a wooden building that can withstand the above.

[0006]

That is, the wooden structure of the present invention comprises at least two adjacent wooden structural members,
A joining member having at least two cylindrical portions into which the ends of the structural member can be inserted, respectively, as basic components, and the structural member becomes a joining member in a state where the ends of the structural member are inserted into the tubular portions of the joining member. Utilizing bolts penetrating the joining member and the structural member to fix, in a skeleton structure of a wooden building to fix the structural member and the joining member, between the bolt and the structural member It is characterized by forming a seismic isolation part that can absorb the vibration received by the building.

[0007] According to such a structure, when the wooden building receives strong vibration due to strong wind such as an earthquake or a typhoon, even if the vibration is transmitted to the bolt, the vibration received by the bolt is removed by the seismic isolation unit. Because it can be absorbed, vibration transmitted to the part where the bolt of the wooden structure was inserted can be reduced, and loosening between the wooden structure and the bolt and cracking of the wooden structure itself are effectively suppressed. can do.

[0008] A specific preferable seismic isolation part is one in which an elastically deformable member made of an elastically deformable material is provided at a position surrounding the bolt. In this case, in a more specific preferred structure, a through hole is formed in the wooden structural member in the thickness direction thereof, and the bolt is inserted into the elastic deformation member in a state where the elastic deformation member is disposed inside the through hole. What was done is mentioned. In particular, in order to disperse the vibration from the bolt almost evenly around it and to prevent the force based on the vibration from concentrating on a specific location, the through-hole shall have a circular, uniform cross-sectional shape and elastic deformation. It is effective to dispose the part closely inside the through hole.

[0009] In order to more effectively suppress the vibration from the bolt to the wooden structural member, the seismic isolation part must be
It is preferable to provide an outer cylindrical portion provided along the through hole and capable of closely storing the elastically deformable member. Furthermore, in order to facilitate the insertion of the bolt into the elastically deformable member, a bolt insertion hole is formed so as to penetrate substantially the center of the elastically deformable member, and the bolt is inserted between the bolt insertion hole and the bolt inserted therein. It is effective to interpose an inner cylinder member.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a wooden building 100 (FIG. 6).
(See FIG. 1) is simplified as an example. The skeletal structure 10 includes four wooden structural members (hereinafter, abbreviated as structural members) 1 and respective structural members 1 for joining these structural members 1 in a rectangular frame shape.
And four joining members 2 arranged at the ends of the two.
The structural member 1 and the joining member 2 are tightened by a bolt 3, and a seismic isolation part X is formed between the bolt 3 and the structural member 1.

First, the structural member 1 is a wooden timber lumber having a size according to a predetermined standard. Then, in order to tightly connect the mutually adjacent structural members 1, as shown in FIG.
1 and a recess 12 having a shape corresponding to the protrusion 11 is formed on the side surface at the end of the other structural member 1 so that the protrusion 11 is inserted closely into the corresponding recess 12. ing. These protrusions 11 and recesses 12 may be formed integrally with the structural member 1 in advance in the step of cutting the structural member 1. Further, in the present embodiment, the structural member 1
As shown in FIGS. 4 and 5, a through hole 13 is formed at a position where a bolt 3 for inserting the structural member 1 into the joining member 2 is inserted in a direction orthogonal to the longitudinal direction of the structural member 1. The specific configuration of the structural member 1 is not limited to such a structure. For example, a concave portion 12 is formed on an end face of the structural member 1 and extends in the same direction and engages with the protrusion 11 of the adjacent other structural member 1. They can be combined. Further, the structural member 1 used in the vertical direction and the structural member 1 used in the horizontal direction may have the same dimensions, and the skeleton structure 10 may have a square frame shape in plan view, or may have different dimensions. Skeletal structure 1
0 may be a rectangular frame shape in a front view.

The joining member 2 has a metal tubular portion 21 having a substantially square cross section corresponding to the cross section of the structural member 1. Since the number of the cylindrical portions 21 is equal to the number of the structural members 1 to be joined by the joining members 2, for example, the joining members 2 shown as a basic structure in FIG. It has two portions 21 and has an L-shape as a whole. In addition, the central axis of each cylindrical portion 21 is made to coincide with the material axis direction of the structural member 1. The cylindrical portion 21 has a bolt insertion hole 2s for fixing the structural member 1 inserted therein. In addition, such a joining member 2 is provided with the two cylindrical portions 2.
1 can be connected to each other so that the inside is hollow, but it can also be manufactured by plastically deforming a metal plate. Note that, as described above, the joining member 2 is provided with the cylindrical portions 21 in a number corresponding to the number of the structural members 1 to be joined, so that the number of the tubular portions 21 is not limited to the above-described L-shape. Three (figure (a)), four (figure (b)), five (figure (c)), or six (figure (d)) tubes arranged at right angles to each other Any one of the joining members 2 having the portion 21 is applied at an appropriate joining portion of the structural member 1.

The seismic isolation part X has a through hole 4s at the center for inserting the bolt 3, and a substantially cylindrical elastic deformation member 4 made of a material such as rubber or urethane surrounding the bolt 3.
And an outer cylinder 41 disposed in the through hole 13 formed in the structural member 1 in which the elastic deformation member 4 is closely housed, and a cylinder disposed in the through hole 4s of the elastic deformation member 4 and through which the bolt 3 is inserted. And an inner cylinder 42 in a shape of a circle. The lengths of the elastic deformation member 4, the outer cylinder 41 and the inner cylinder 42 substantially correspond to the length of one side of the structural member 1. Further, a general thin metal pipe having an appropriate diameter may be applied to the outer cylinder 41 and the inner cylinder 42.

When two adjacent structural members 1 are joined by the joining member 2, the outer cylinder 4, which is a component of the seismic isolation part X, is first inserted into the through hole 13 of the structural member 1.
The elastic deformation member 4 is press-fitted into the outer cylinder 41, and the inner cylinder 42 is press-fitted into the through hole 4s of the elastic deformation member 4. Then, each structural member 1 is inserted from the open end side of each cylindrical portion 21 of the joining member 2, and the projection 11 of one structural member 1 is inserted inside the joining member 2 into the other structural member 1.
Into the recess 12. At this time, the inner cylinder 42 arranged in the through-hole 13 of the structural member 1 and the bolt insertion hole 2s formed in the joining member substantially coincide with each other. Then, the bolt 3 is inserted into the bolt insertion hole 2s and the inner cylinder 42, and the nut 43 is fastened to the tip of the bolt 3 to fix the structural member 1 to the joining member 2. That is, in this state, the shaft portion of the bolt 3, the inner cylinder 42, the elastically deformable member 4, the outer cylinder 41, the through hole 13, and the bolt insertion hole 2
s is substantially concentric when considered in a longitudinal section. A washer 44 having a different size is provided between the head of the bolt 3 and the nut 43 and the outer surface of the joining member 2.
45 are provided two each.

In this embodiment, FIGS. 1, 2 and 6
As shown in FIG. 2, the joining members 2 at diagonal positions in the skeletal structure 10 are connected to each other by metal shafts 5, and the shafts 5 are joined to the joining members 2 by compression coil springs 6 provided at the ends of the shafts 5. It is elastically biased. As shown in FIG. 3, the joining member 2 is provided with a base 22 having a right-angled triangular shape in front view for attaching the shaft 5, the compression coil spring 6, and the like, between the adjacent cylindrical portions 21. By doing in this way, when compared with braces simply fixed with nails etc. as in the conventional construction method,
Since the shaft 5 and the compression coil spring 6 are arranged with high tensile strength between the joining members 2 at diagonal positions, the strength of the skeletal structure 10 is improved.

According to the present embodiment having the above-described configuration, in the skeletal structure 10 constituting the wooden building 100, the adjacent wooden structure is used in order to standardize each member and improve the accuracy at the time of construction. The end of the member 1 is inserted into the cylindrical portion 21 of the metal joining member 2, and the structural member 1 is
Thus, a structure that is fixed to the joining member 2 is adopted, and a seismic isolation part X is provided between the bolt 3 and the wooden structural member 1. For this reason, when the wooden building 100 receives a strong vibration due to a strong wind such as a typhoon or an earthquake, the bolt 3
The vibration transmitted to the structural member 1 can be suppressed by absorbing the vibration transmitted to the structural member 1, so that the structural member 1 can be prevented from loosening or cracking at the contact portion with the bolt 3. In addition to the skeletal structure 10, the entire wooden building 100 can have high strength.

In particular, the seismic isolation part X is provided with an elastically deformable member 4 which is closely arranged in a through-hole 13 formed in the structural member 1 and which has a circular shape. Since it has a cross section, even with such a simple structure, the vibration transmitted from the bolt 3 to the elastically deformable member 4 is substantially evenly distributed in each direction to prevent concentration of force due to the vibration in one place. And the seismic isolation effect can be further improved.

Furthermore, since the elastically deformable member 4 is press-fitted into the outer cylinder 41 provided along the through hole 13 of the structural member 1, the elastically deformable member 4 is directly inserted into the through hole 13 of the wooden structural member 1. It can be arranged more easily than when it is inserted. In addition, since the bolt 3 is passed through the inside of the inner cylinder 42 penetrating the center of the elastically deformable member 4, the bolt 3 can be easily disposed.

The wooden structure of the present embodiment described above can be applied not only to the construction of the wall of the building 100 but also to the floor and ceiling. In addition, the specific configuration of each unit is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0021]

As described in detail above, in the construction of a wooden building, according to the present invention, a wooden structural member is joined to a joining member by using a bolt at a position where an adjacent wooden structural member is inserted into the cylindrical portion of the joining member. When fixed to a wooden structural member, the vibration transmitted from the bolt to the wooden structural member is suppressed by the action of the seismic isolation part formed between the bolt and the wooden structural member. Therefore, when such a wooden building is subjected to a large vibration due to an earthquake or strong wind, the vibration transmitted to the metal bolt can be absorbed by the seismic isolation part before being transmitted to the wooden structural member. It is possible to effectively prevent loosening or cracking that is likely to occur in a hole or the like formed in the wooden structural member for insertion, and it is possible to maintain the strength of the entire wooden building.

Further, an elastically deformable member formed of an elastically deformable material is used for the seismic isolation portion, and the elastically deformable member is embedded in a through hole formed at a bolt insertion position of the wooden structural member, or the through hole or the elastically deformable member is formed. By taking measures such as making the cross section of the member circular, vibration transmitted from the bolt can be more effectively suppressed.

Further, the outer cylindrical portion covering the periphery of the elastically deformable member is inserted into a through hole formed in the wooden structural member, and the inner cylindrical portion covering the periphery of the bolt is provided inside the elastically deformable member so that the elastically deformable member is elastically deformed. It is possible to improve the ease of disposing the member on the wooden structure and the ease of inserting the bolt into the elastically deformable member.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an example of a basic structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a skeleton structure constituting the same basic structure.

FIG. 3 is an exploded perspective view showing a main part of the skeletal structure.

FIG. 4 is an exploded perspective view showing the wooden structural member and the seismic isolation structure in the embodiment.

FIG. 5 is a schematic sectional view of the seismic isolation structure.

FIG. 6 is a schematic front view of a wooden building to which the seismic isolation structure of the embodiment is applied.

FIG. 7 is an exemplary perspective view showing an example of a joining member applied to the embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Wooden structural member 2 ... Joint member 3 ... Bolt 4 ... Elastic deformation member 10 ... Skeletal structure 13 ... Through-hole 21 ... Cylindrical part 41 ... Outer cylinder part (outer cylinder) 42 ... Inner cylinder part (inner cylinder) 100 ... Wooden Building X: seismic isolation section

Claims (6)

[Claims] A basic construction element comprising at least two adjacent wooden structural members and a joining member having at least two cylindrical portions into which the ends of the structural members can be inserted, respectively, and the ends of the structural members are formed. In order to fix the structural member to the joining member in a state of being inserted into the cylindrical portion of the joining member, a wooden building in which the structural member and the joining member are fixed by using the joining member and a bolt penetrating the structural member is used. A seismic isolation structure for a wooden building, wherein a seismic isolation part capable of absorbing vibration received by the building is formed between the bolt and the structural member in the skeleton structure of the object. 2. The seismic isolation structure according to claim 1, wherein the seismic isolation portion includes an elastically deformable member made of a material that can be elastically deformed at a position surrounding the bolt. 3. The wooden structural member is formed with a through hole that opens in the thickness direction thereof, and the bolt is inserted into the elastic deformation member in a state where the elastic deformation member is disposed inside the through hole. The seismic isolation structure of a wooden building according to claim 2, wherein: 4. The seismic isolation structure of a wooden building according to claim 3, wherein said through-hole has a circular cross-sectional shape, and said elastically deformable portion is closely arranged inside said through-hole. 5. The seismic isolation part according to claim 3, wherein the seismic isolation part has an outer cylinder part arranged along the through hole and capable of closely accommodating the elastic deformation member. Seismic isolation structure of wooden building. 6. A bolt insertion hole is formed at a substantially central portion of the elastic deformation member so as to penetrate therethrough, and an inner cylindrical member is interposed between the bolt insertion hole and a bolt inserted therein. 6. The seismic isolation structure of a wooden building according to claim 2.