JP2021113453A - Base isolation structure and base isolation wooden structure - Google Patents

Abstract

To provide a base isolation structure which solves problems such as a fastening strength of a wooden trestle and a base isolation device, torsion strength of the trestle and a trestle weight against high wind load.SOLUTION: A base isolation structure includes a plurality of base isolation devices 16 arranged on a foundation 15, a plurality of base isolation plates 19 fixed to the isolation devices 16, respectively and a wooden trestle 21 to which the base isolation plates 19 are fixed and that supports a wooden building. The wooden trestle 21 has an outer peripheral frame provided so as to have a space with a predetermined size therein, and a plurality of lattice frames formed by dividing the inside of the outer peripheral frame by a plurality of inner frame materials arranged in a lattice shape longitudinally and laterally at predetermined intervals. Each of the base isolation plates 19 is brought into contact with each of the lattice frames corresponding to the base isolation device among the plurality of lattice frames, each of the base isolation devices 16 is fixed to the lower surface of each of the base isolation plates, the upper surfaces are fixed to the peripheral frames of the lattice frames to form frame spaces 30 with predetermined sizes in the respective lattice frames, and concrete solidification bodies 26 formed by filling and solidification of concrete is arranged in the frame spaces 30.SELECTED DRAWING: Figure 3

Description

The present invention relates to a seismic isolation structure and a seismic isolation wooden building. Regarding buildings.

Japan is an earthquake-prone country and is constantly threatened by the fear of a major earthquake. In the event of a major earthquake, not only can many buildings collapse or be partially destroyed, but also transportation such as roads and other transportation networks that are the backbone of other daily lives, electricity, water, and gas. Infrastructure facilities such as these will collapse and the local community will be in turmoil.

Structures and construction methods have been developed to prevent or reduce the collapse of buildings against this earthquake. These structures include, for example, a seismic isolation structure (a structure that hardens the building itself by inserting a reinforcing material to strengthen the walls and pillars to counter vibration), and a seismic isolation structure (a vibration reduction device inside the building). Installed to absorb seismic energy, make the building sticky and suppress vibration), and seismic isolation structure (install a seismic isolation device between the building and the ground to insulate the building from the ground There is a structure that does not transmit vibration).

Of these, the seismic isolation structure has the advantage of reducing shaking inside the building. That is, the seismic isolation structure is installed on the basis of a seismic isolation device, and this seismic isolation device absorbs intense seismic energy and changes it into gentle rolling, and damage such as furniture falling can be minimized. .. Due to these advantages, research and development of seismic isolation devices and construction methods for high-rise buildings have been conducted so far, and they are currently used in new high-rise buildings and important public facilities in large cities.

On the other hand, since most of the housing situation in Japan is made of wood, seismic isolation of this wooden house is generally difficult to construct, and its light weight makes it less effective, and the total cost including construction cost is low. It is said that it is difficult to spread because it is expensive, and efforts to tackle it have been delayed so far. However, in recent years, research and development of seismic isolation devices and construction technologies for general wooden houses have been promoted in housing manufacturers and industry-academia joint projects, and they have begun to be adopted in some houses, such as prefabricated houses. The results of the development are also introduced in the patent literature.

For example, the following Patent Document 1 (Patent No. 3827115) describes a seismic isolation structure.
This seismic isolation structure includes a substructure installed on the ground, a flat frame located above the substructure, a seismic isolation device interposed between the substructure and the flat frame, and a flat surface. It includes an upper structure located at the top of the frame, and the flat frame is made of steel, wood, or reinforced concrete, which is reinforced with flint members.

Further, the following Patent Document 2 (Japanese Unexamined Patent Publication No. 2008-266958) describes a frame for a wooden house made of a laminated material.
In this wooden house pedestal, as shown in FIG. 8, the pedestal 1 is supported by a plurality of small seismic isolation devices 3 on the foundation 2, the pedestal is assembled from wood, and at least the peripheral portion thereof is a plurality of coniferous trees. It is composed of a laminated material made of. That is, the gantry 1 is assembled into a hollow polygon or a frame shape by a plurality of timbers (for example, large lumber, joists, etc.) 5 and fasteners, and these timbers 5 are laminated members made of a plurality of coniferous trees. The gantry 1 has a structure in which mounting plates 4 for a seismic isolation device are mounted on a plurality of corners and corners on the lower surface. The gantry 1 is provided with wooden reinforcing members 6 having substantially triangular planes at the four corners, and these are fitted via fasteners including bolts to prevent deformation.

Further, the following Patent Document 3 (Patent No. 4491004) describes a similar frame for a wooden house.
This wooden house pedestal is an improved version of the pedestal described in Patent Document 2, and the pedestal is a combination of a frame timber and a plurality of vertical and horizontal timbers, and a hollow region is formed between the frame timber and the plurality of vertical and horizontal timbers. Multiple beam timbers are erected vertically, horizontally and diagonally horizontally in this hollow area, and these beam timbers improve the strength against tension in the event of an earthquake, suppress the deformation of the gantry, and construct. It has a structure that reduces costs.

Japanese Patent No. 3827115 Japanese Unexamined Patent Publication No. 2008-266958 Japanese Patent No. 4103545

The seismic isolation structures described in Patent Documents 1 to 3 are all interposed between the foundation constructed on the ground, the pedestal located on the foundation and supporting the building, and the foundation and the pedestal. It is composed of a plurality of seismic isolation devices and other members that exert a seismic isolation function.

Among these members, the flat frame in the seismic isolation structure described in Patent Document 1, that is, the seismic isolation pedestal is made of steel frame, wood, or reinforced concrete. In these seismic isolation pedestals, the reinforced concrete pedestal (hereinafter referred to as RC pedestal) is made of concrete slab (floor slab), so the construction method is to first make a formwork, then arrange the reinforcing bars, and concrete. It goes through each process such as driving and removing the formwork, and these operations are troublesome and time-consuming. As a result, there are problems that the construction period is long, the weight is heavy, and the cost cannot be reduced. In addition, the steel frame pedestal (hereinafter referred to as the steel frame pedestal) is a custom-made product for a manufacturer specializing in metal processing, and the product including material cost and processing cost is more expensive than the reinforced concrete pedestal.

Further, the seismic isolation structure described in Patent Documents 2 and 3 is composed of a wooden frame made of wood (hereinafter, referred to as a timber frame frame). However, these timber-framed mounts have the following problems.
That is, this problem is the tightening strength (problem 1) at the joint between the timbered frame and the seismic isolation device, the torsional strength of the timbered frame (problem 2), and the weight of the frame against a high wind load (problem 3). Hereinafter, these issues 1 to 3 will be described.

Problem 1: Tightening strength at the joint between the timber frame and the seismic isolation device For the seismic isolation structure, multiple seismic isolation devices are installed between the building and the ground, and this building is installed from the ground (foundation). Since the structure is insulated and does not transmit vibrations, the gantry and the seismic isolation device must be firmly connected (also called tightening). The reason is that the building (base) cannot be insulated from the ground (foundation) unless it is firmly connected (tightened), and the building tilts due to the seismic force at the time of an earthquake, so the seismic isolation effect is not exhibited. be.

However, in the seismic isolation structure, when the gantry is made of wood, the connection between the timber frame pedestal and the seismic isolation device becomes the bond between the gantry wood and the metal that constitutes the seismic isolation device, and this connection is made at the time of an earthquake. Not only must it perform the function of loosening, not moving, not moving, and not coming off (hereinafter collectively referred to as sliding) due to seismic force, but it must also have a firm and strong tightening strength that does not break. However, it is difficult to secure such a firm and strong tightening strength by connecting with a timber frame. That is, the timber frame is made of wood, which has advantages such as easy availability, easy processing, and low cost, but it is also fragile, prone to putrefaction, and greatly deteriorates over time. It has weaknesses such as brittleness, and has difficulty in durability compared to metal materials and reinforced concrete materials.

On the other hand, the seismic isolation device usually connects a pair of saucers, a sphere interposed between the saucers, and a pair of saucers to form a sphere, as described in the specification of Patent Document 2. Consisting of a surrounding connector, each of these pair of saucers is made of metal. Then, the bond between the timber frame and the seismic isolation device becomes wood and metal made of different materials, and the wood of the timber frame frame is weaker than the metal material of the seismic isolation device. As described above, it is extremely difficult to secure a firm and strong tightening strength that does not slip.

Therefore, in the seismic isolation structure described in Patent Document 2, the seismic isolation device and the timber frame frame are connected via a mounting plate, but the connection via the mounting plate alone is required. There is a limit to ensuring the tightening strength. Further, in the seismic isolation structure described in Patent Document 1, a flint member is provided and a seismic isolation device is connected to this member, but it is difficult to secure the required tightening strength even with this connection. be.

Problem 2: About the torsional strength of the timber-framed frame When an earthquake occurs, the building receives strong rolling, and an excessive tensile force acts on the frame, which makes it easy for the timber-framed frame to undergo torsional deformation.
Therefore, in the seismic isolation structure described in Document 1 above, a flint member is installed and reinforced on the flat plate to prevent the flat plate from being (twisted) deformed. Further, in the gantry in the seismic isolation structure described in Patent Document 2, reinforcing metal fittings are attached to the intersections of a plurality of timbers constituting the gantry, and a wooden reinforcing material having a substantially triangular plane is formed in the four corners of the gantry. Are connected with bolts to prevent deformation of the gantry. Further, in the gantry in the seismic isolation structure described in Patent Document 3, a hollow region is formed between the frame timber of the gantry and the plurality of vertical and horizontal timbers, and a plurality of beam timbers are vertically and horizontally placed in the hollow region. , It is erected diagonally and horizontally to improve strength and rigidity and prevent deformation of the gantry.

However, these flint members, wooden reinforcing materials equipped with reinforcing metal fittings, and beam timber are generally called streaks (bracing), and such streak reinforcement is a local connection, that is, a connection by so-called point contact. However, the coupling area is small, and as a result, it is difficult to secure the rigidity required for structural calculation, that is, the so-called floor surface rigidity.

Problem 3: About the weight of the gantry against a high wind load Since the timber-framed pedestal is lighter in weight than the RC pedestal and the steel-framed pedestal, the total number of seismic isolation buildings (hereinafter, also referred to as seismic isolation buildings or simply buildings) of the timber-framed gantry. The weight is also lighter, and there is a risk that the building will move due to strong winds such as large typhoons (eg, unexpected strong winds, that is, wind forces that exceed the design value), and the seismic isolation device will fall off (usually a wind restraint device). Etc. are installed to prevent it from falling off), and it is necessary to further improve safety. That is, since the seismic isolation building of the RC frame is given sufficient weight, it does not easily start to move due to the wind, and the seismic isolation building of the steel frame frame is similar to the seismic isolation building of the RC frame. .. On the other hand, the seismic isolation building with a timber frame has a lighter total weight than the seismic isolation building with an RC frame and a steel frame, so there is a risk that the building will move if it receives a strong wind due to a large typhoon or the like. There is.

Seismic isolation buildings are usually installed with a wind restraint device, for example, a wire (fail-safe wire) with a sufficient length that does not interfere with seismic displacement, joined to the skeleton above and below the seismic isolation layer as a measure against wind. A method or a method in which the upper and lower skeletons are applied to each other via a cushioning material when the seismic isolation layer is displaced is adopted, and it is considered safe. Of course, this is also installed in the seismic isolation structure of the present invention, but as a measure to further improve safety, it is necessary to increase the weight of the timber frame and bring it closer to the weight of the RC frame and steel frame. Become.

By the way, there is a high demand for seismic isolation structures even in the traditional wooden construction method. Especially in the Sanin region, although about 65% of all new constructions are built by the traditional wooden construction method, the seismic isolation technology completed by this conventional wooden construction method has not yet been established, and in recent years, housing manufacturers. In addition, in industry-academia joint projects, research and development of this seismic isolation device and construction technology for houses have been promoted, and it has only begun to be adopted in some houses such as prefabricated houses.

The design and construction technology of seismic isolated houses is a new technology, and the structural design is examined individually by the central government office and is a high hurdle, and it is difficult for local private companies to design and construct beyond this hurdle. It's getting harder. In other words, the seismic isolation structure is a construction method that requires a structural calculation suitability judgment by a so-called specialized institution, in which structural examination by a specific administrative agency is not permitted under the Building Standards Law. Therefore, for this seismic isolation structure, it is necessary to perform structural calculation by the method shown in the seismic isolation notification, and this calculation is for the upper structure (building), seismic isolation layer, lower structure (foundation) and mutual joints. It is a calculation to perform structural design, and in the design of the seismic isolation pedestal of a wooden building, the seismic isolation notification is given by the predetermined floor surface rigidity, that is, in-plane shear rigidity, out-of-plane flexural rigidity and torsional rigidity. Rigidity that meets the indicated criteria is required.

The present inventors have the above-mentioned problems 1 to 3 in the conventional timber-framed pedestal, and these are extremely difficult to solve even with the pedestals described in the above-mentioned Patent Documents 2 and 3, so that they should be solved. , Design and experiment of seismic isolation detached house by traditional wooden construction method, specifically, based on architectural design suitable for the climate of Sanin region, including irregular plane shape and three-dimensional shape house design which is in high demand in recent years I have been working on it.

In this effort, the present inventors have previously developed a seismic isolation structure that solves the above problems 1 and 2, and have already filed a patent application (Japanese Patent Application No. 2018-140563, hereinafter referred to as a prior invention) for the results. is doing. That is, in the prior invention, the tightening strength of the above problem 1 can be solved by providing a plate receiving bone, a seismic isolation plate, etc., and the torsional strength of the above problem 2 is the connection between the wooden frame and the plate receiving bone. Is performed by surface contact coupling with a larger area instead of local point coupling, and the seismic isolation device is coupled via a seismic isolation plate of a predetermined size. A certain remainder is added to the response displacement (movement amount) of the building during an earthquake of the seismic isolation device to be adopted and used, and the size calculated based on this added value (this size is the seismic isolation building). It can be solved by making it related to the seismic isolation clearance, which is indispensable for seismic isolation, and the floor surface rigidity required for structural calculation can be secured. Similarly, the building movement of the above-mentioned problem 3 can be solved by forming a heavy solidified material having a predetermined shape and size instead of the above-mentioned plate receiving timber. The seismic isolation clear alliance is a gap (clearance) between the foundation and the building that is safe even if the seismic isolation device is displaced when an earthquake occurs and the building (building) shakes.

An object of the present invention is to further increase the effect of the above-mentioned prior invention, and the problems of the conventional timbered frame, that is, the tightening strength between the timbered frame and the seismic isolation device, the torsional strength of the frame, and the high wind. Solving problems such as the weight of the gantry with respect to the load, ensuring the floor surface rigidity required for structural calculation, further simplifying and simplifying the construction method and shortening the construction period, aiming for total cost reduction. The purpose is to provide a seismic isolation structure that can be applied to wooden houses.

Another object of the present invention is to provide a seismic isolation structure having the above-mentioned object, to realize simplification and simplification of the construction method, shortening of the construction period, etc., to reduce the total cost, and to achieve the demand in recent years. The purpose is to provide seismic isolated wooden buildings with many irregular planar shapes and three-dimensional residential designs.

The seismic isolation structure of the first aspect of the present invention includes a foundation constructed on the ground, a plurality of seismic isolation devices arranged on the foundation, and a plurality of seismic isolation devices fixed to each of the seismic isolation devices. It is a seismic isolation structure equipped with a seismic isolation plate and a wooden frame base on which each of the seismic isolation plates is fixed to support a wooden building.
The timbered frame is formed by forming an outer peripheral frame having a space of a predetermined size inside and a plurality of inner frame members formed by dividing a plurality of inner frame members in a grid pattern at predetermined intervals in the vertical and horizontal directions. Has a grid frame and
The wooden frame mount abuts the seismic isolation plate on the lattice frame corresponding to the seismic isolation device among the plurality of lattice frames, and fixes each seismic isolation device to the lower surface of the seismic isolation plate. Then, the upper surface is fixed to the peripheral frame of the lattice frame to form a frame space of a predetermined size in each lattice frame, concrete is filled and solidified in the frame space, and the inside of the frame space is solidified with concrete. It is characterized by being fixed by the body.

Further, the seismic isolation structure of the second aspect of the present invention is the area of the contact joint surface of the seismic isolation device, the seismic isolation plate and the concrete solidified body of the timber frame in the seismic isolation structure of the first aspect. Are A1, A2, and A3, respectively, and these have the following relationships:
A2> A1, A2> A3
It is characterized by being in.

Further, in the seismic isolation structure of the third aspect of the present invention, in the seismic isolation structure of the first or second aspect, the outer peripheral frame and the lattice frame constituting the timber frame are both formed of laminated material. The concrete solidified body is characterized in that it is formed of a non-shrink mortar.

Further, in the seismic isolation structure according to the fourth aspect of the present invention, in any of the first to third seismic isolation structures, a plurality of lower empty U-shaped reinforcing bars are provided on the upper surface side of the seismic isolation plate. The plurality of lower empty U-shaped reinforcing bars are embedded in the concrete solidified body.

Further, the wooden seismic isolation building according to the fifth aspect of the present invention is characterized by having any one of the first to fourth seismic isolation structures.

According to the seismic isolation structure of the first aspect of the present invention, the weight of the timbered frame is increased due to the presence of the concrete solidified body in the frame space, and it is possible to withstand a high wind load and further enhance the safety. In addition, issues with the seismic isolation device, for example, the strong tightening strength can be secured by combining with the seismic isolation device, and the floor rigidity required for structural calculation is secured, and the construction method can be simplified and simplified. The construction period can be shortened, and the total cost can be reduced, making it possible to apply it to wooden houses.

According to the seismic isolation structure of the second aspect of the present invention, the areas of the contact joint surfaces of the seismic isolation device, the seismic isolation plate, and the concrete solidified body of the wooden frame are set to A1, A2, and A3, respectively, and their sizes are large. Since A2> A1 and A2> A3, it is possible to secure the floor surface rigidity required by the structural calculation. That is, the timber frame can secure the rigidity satisfying the criteria shown in the seismic isolation notification by the in-plane shear rigidity, the out-of-plane bending rigidity and the torsional rigidity.

According to the seismic isolation structure of the third aspect of the present invention, since the outer peripheral frame and the lattice frame constituting the timber frame are both made of laminated materials, they can be easily obtained, processed, and manufactured at low cost. Moreover, since the concrete solidified body uses non-shrink mortar, the connection with the seismic isolation plate and the timber frame becomes firm.

According to the seismic isolation structure of the fourth aspect of the present invention, since a plurality of open U-shaped reinforcing bars are provided on the upper surface side of the seismic isolation plate, the seismic isolation plate can be easily carried during construction. In addition, when the construction is completed, a plurality of lower empty U-shaped reinforcing bars are embedded in the concrete solidified body, so that the strength of the concrete solidified body is increased.

According to the wooden seismic isolation building of the fifth aspect of the present invention, the construction method can be simplified and simplified, the construction period can be shortened, the total cost can be reduced, and the irregular plane has been in high demand in recent years. We can provide seismic isolated wooden buildings with shapes and three-dimensional housing designs.

It is a front view of the seismic isolation wooden building provided with the seismic isolation structure which concerns on embodiment of this invention. FIG. 2A is an enlarged cross-sectional view of a main part of the seismic isolation structure in which a part of the seismic isolation wooden building of FIG. 1 is broken, and FIG. 2B is a cross-sectional view of the seismic isolation device. It is isometric (isometric projection) figure of the main part of the seismic isolation structure which concerns on embodiment of this invention. FIG. 4 shows a seismic isolated wooden building (wooden house) of FIG. 1, FIG. 4A is a first floor plan view, and FIG. 4B is a second floor plan view. FIG. 5 shows the foundation portion of the seismic isolated wooden building of FIG. 1, FIG. 5A is a plan view of the seismic isolation table arrangement in the foundation portion, and FIG. 5B is a plan view of the seismic isolation plate arrangement corresponding to each seismic isolation device. .. FIG. 6 shows one of the seismic isolation plates shown in FIG. 5B, FIG. 6A is a plan view, and FIG. 6B is a partial cross-sectional view showing a bonding state between the seismic isolation plate and the solidified concrete. FIG. 6C is a perspective view when a lower empty U-shaped reinforcing bar is provided on the seismic isolation plate. FIG. 7 is a plan view of a timber frame frame supporting the seismic isolated wooden building of FIG. FIG. 8 shows a frame for a wooden house of the prior art, FIG. 8A is a partial cross section, and FIG. 8B is a perspective view of a main part.

Hereinafter, the seismic isolation structure according to the embodiment of the present invention and the seismic isolation wooden building provided with the seismic isolation structure will be described with reference to the drawings. However, the embodiments shown below exemplify a seismic isolation structure for embodying the technical idea of the present invention and a seismic isolated wooden building provided with the seismic isolation structure, and specify the present invention to this. It is not intended and may be equally applicable to those of other embodiments within the scope of the claims.

[Embodiment]
The outline of the seismic isolation structure and the seismic isolation wooden building provided with the seismic isolation structure according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a front view (south side elevation view) of a seismic isolated wooden building having a seismic isolation structure according to an embodiment of the present invention, and FIG. 2A is a partially broken seismic isolated wooden building of FIG. An enlarged cross-sectional view of the main part of the seismic isolation structure, FIG. 2B is a cross-sectional view of the seismic isolation device, and FIG. 3 is an isometric view of the main part of the seismic isolation structure according to the embodiment of the present invention.

As shown in FIGS. 1 and 2, the seismic isolated wooden building 10 having the seismic isolation structure according to the embodiment of the present invention is composed of a two-story wooden house above the ground, and the wooden house is on the ground _GL . a lower structure 10 _G foundation built, stand where the timber to aggregate to support the wooden houses of the upper structure 10 located thereon _F (hereinafter, half-timbered referred pedestal) 21, and the lower structure 10 _{G A seismic isolation layer 10 D} in which a seismic isolation device 16 is arranged between the upper structure 10 _F is provided, and the seismic isolation layer 10 _D includes a plurality of seismic isolation devices 16 _{1 to} 16 ₁₂ (FIG. 4A). , See FIG. 5B) are arranged. The timber frame 21 is made of an integrated material. The present invention does not limit the wooden building to a two-story wooden house above ground, but may be arbitrary.

As shown in FIGS. 1 to 3, the seismic isolation structure 11 in this seismic isolation wooden building (wooden house) includes a foundation constructed on the ground and a plurality of seismic isolation devices arranged on the foundation. The wooden frame 21 is provided with 16, a plurality of seismic isolation plates 19 fixed to each seismic isolation device, and a wooden wooden frame 21 to which each seismic isolation plate is fixed to support a wooden building. , An outer frame 22 having a space of a predetermined size inside, and an inner frame member composed of a plurality of vertical frame members 23, an inner frame member 24, and a connecting frame member 25 in the outer peripheral frame 22 at predetermined intervals in the vertical and horizontal directions. It has a plurality of lattice frames 30 having a predetermined size and formed by opening and dividing them into a grid pattern. The timber frame 21 abuts the seismic isolation plate 19 on the grid frame 30 at the position corresponding to the seismic isolation device 16 among the plurality of grid frames 30, and each seismic isolation device is on the lower surface of the seismic isolation plate 19. 16 is fixed, and the upper surface is fixed to the peripheral frame materials (outer peripheral frame 22, vertical frame material 23, horizontal frame material 24, connecting frame material 25) forming each lattice frame 30, and inside each lattice frame 30. A frame space of a predetermined size is formed, concrete is filled and solidified in the frame space, and the frame space is fixed by a concrete solidified body 26.

In this seismic isolation structure 11, when the areas of the connecting planes of the timber frame frame to which the seismic isolation device 16, the seismic isolation plate 19, and the concrete solidified body 26 are fixed are compared as A1, A2, and A3, these have the following relationships. The formula (a) is used.
A2> A1, A2> A3 ... (a)
Then, in the relational expression (a), the area A2 of the seismic isolation plate 19 is determined by the seismic isolation device adopted and used.

That is, the area A2 of the seismic isolation plate is calculated by adding a certain remainder to the response displacement (movement amount) of the building during an earthquake of the seismic isolation device to be adopted and used, and calculating based on this added value. It has become. This size (length) is related to the seismic isolation clearance, which is indispensable for seismic isolated buildings.
As described above, by setting the area of the seismic isolation plate A2 as described above and satisfying the relational expression (a), the timber frame can secure the floor surface rigidity required in the seismic isolation structure calculation.

According to this seismic isolation structure, the problems of the conventional timbered frame, that is, the tightening strength between the timbered frame and the seismic isolation device, the torsional strength of the frame, and the weight of the frame against a high wind load are solved. By ensuring the floor rigidity required for structural calculation, simplifying and simplifying the construction method and shortening the construction period, it will be possible to apply it to wooden houses with the aim of reducing the total cost.

Hereinafter, the seismic isolation structure and the individual configurations and other features of the seismic isolation wooden house equipped with the seismic isolation structure will be described. Seismic isolation wooden buildings (hereinafter, simply also referred building) 10, the seismic isolation layer 10 _D, a plurality of seismic isolation device _{161-164 12} (Fig. 4A, see FIG. 5B) are arranged respectively at predetermined positions ing. These seismic isolation devices have the same configuration.

As shown in FIG. 2B, the seismic isolation device 16 connects a pair of saucers 17a and 17b facing each other, a sphere 18 movably interposed between these saucers, and a pair of saucers 17a and 17b to form a sphere. 18 and a flexible connecting member which surrounds from outside, the pan 17a, 17b is recessed holes 17 ₀ for spheres are seen formed on the opposite surface. Sphere 18 is composed of a single or a plurality of iron balls or steel balls or the like, a pair of saucer 17a, by rolling contactable to sliding contact with the recessed hole 17 ₀ 17b, the pair absorb seismic energy in the event of an earthquake saucer 17a and 17b are moved and displaced. Further, the connecting body is formed in an elastic cylindrical shape, and the opened end portion is fitted to the peripheral edge portion of each of the saucers 17a and 17b.

According to the seismic isolation device 16, when an earthquake occurs and the foundation of the building vibrates (also called vibration), the sphere of the seismic isolation device rolls inside the connecting body to exert a bearing function, and the pair of saucers are in opposition. It slides in the direction of the earthquake to parry the shaking of the earthquake, and the building is seismically isolated by this parrying effect. Due to this seismic isolation action, furniture and the like in the house do not fall over, and the resident can reduce the feeling of fear. It should be noted that such a seismic isolation device has already been commercialized, marketed and publicly known.

The seismic isolation structure and the seismic isolation wooden building according to the embodiment of the present invention use, for example, the following seismic isolation devices that are already on the market. Manufacturer name (Oiles Industry Co., Ltd.), product name (seismic isolation device for lightweight buildings: FPS-HP), product target (about 1 to 3 stories of wooden construction), product structure (molded by pressing a stainless steel plate) , manufactured meets the filler into the cavity portion), the movable element diameter (100Fai), long-term surface pressure (up to ^{13.5N / mm 2, 10.0N / mm} 2 is measure an average of the entire building). The external dimensions of the FPS-HP main body are 630 x 630 x H (93.1) mm.

The seismic isolation device, the device spacing as small number of uses increases, the loads of the frame supporting the housing is increased, manufacturers use of about one on the building area (first floor floor area) 10 m ² Recommended. The above is taken from the pamphlet issued by the company. In addition, this product specification is the basis for determining the design dimensions of the lower structure, the timber frame, the upper structure, etc., which will be described later. Further, the present invention does not limit the seismic isolation device to the above-mentioned one, and seismic isolation devices of other manufacturers and other specifications can be used.

Next, the superstructure will be described with reference to FIG. Note that FIG. 4 shows the seismic isolated wooden building of FIG. 1, FIG. 4A is a first floor plan view, and FIG. 4B is a second floor plan view. The superstructure _10F consists of a two-story wooden house above ground, and the second floor occupies about 50% of the building area, which is unevenly distributed on the northeast side. Then, as shown in FIG. 4, the 1st floor _101F has a flat shape and has a U-shape with a courtyard incorporated, and a wooden deck (for example, 12m2) is provided in the center on the south side, and each has a predetermined floor plan on the 1st floor. each predetermined size, for example Japanese style, DK, hobby room, dirt floor storage, wash-bath, entrance hall, and machine room, also bedroom on the second floor 10 _2F, Japanese-style, children room, etc. closet is provided. The total floor area of this house is, for example, 133.88 m ² , and the building area is 106.20 m ² .

This wooden house is a pure Japanese style, _{and a wooden deck is provided on the 101st} floor of the 1st floor, and the two-story part of about 50% of the building area is unevenly distributed on the northeast side. Compared to the disclosed building (planar shape and three-dimensional shape are standard), the plane shape and three-dimensional shape have an irregular design. For this reason, the seismic isolation structure calculation cannot be applied as it is to the conventional fixed form calculation, and is troublesome in comparison with it. The wooden house is not limited to the above, and may be any type of house. As shown in FIG. 4A, a plurality of seismic isolation devices 16 _{1 to} 16 ₁₂ are arranged under the floor on the 1st floor 10 _1F. In addition, this wooden house is built with a predetermined seismic isolation clearance in each of the north, south, east and west. This clearance will be described later.

The substructure will be described with reference to FIG. 5A shows the foundation part of the seismic isolated wooden building of FIG. 1, FIG. 5A is a plan view of the seismic isolation table arrangement in the foundation part, and FIG. 5B is a plan view of the seismic isolation plate arrangement corresponding to each seismic isolation device. Is.

The substructure 10 _G is located in the ground GL and is constructed with a predetermined seismic isolation clearance between the building and the surrounding area. Seismic isolation clearance (hereinafter referred to as clearance) is indispensable for seismic isolation buildings, and the horizontal displacement (movement) of a building due to seismic force is the surrounding even if this maximum horizontal displacement occurs. A gap provided so as not to collide with a structure or land, that is, a separation from the periphery of the building, which is a separation between the building from the adjacent land and the road boundary, or the surrounding structures, etc. It is a separation that adds a certain margin to the response position (movement amount) of the building.

A certain margin is, for example, plus 20 cm or more in the part where people may be caught due to the movement of the building (for example, the outer wall of the first floor or the bay window part), and the part where there is no possibility of people entering (for example, the eaves). (2nd floor, balcony, etc.), for example, plus 10 cm or more, and these are decided by the notification. This clearance will change depending on the seismic isolation device used and used. That is, since FPS-HP is used in this embodiment, the response displacement amount that can be used in the design is 405 mm (100φ), and as a result, the clearance of the building layout design has a constant margin of the response displacement amount of 405 mm. The separation value is obtained by adding 100 mm to 200 mm. _{Reference numerals L 1} and L ₂ in FIG. 1 indicate clearances from one side wall of the building. Of course, the other four side walls also have a predetermined clearance.

As shown in FIG. 2A, this substructure 10 _G has a reinforced concrete structure, a solid foundation base concrete 13 is laid on the split chestnut stone 12, and is connected to an underground beam, and a plurality of seismic isolation devices 16 ( It is composed of a robust structure having a plurality of seismic isolation tables 15 (one of the plurality is shown) supporting a plurality of seismic isolation tables 15 (one of the plurality is shown). The underground beam has a structure in which concrete is placed by arranging reinforcing bars (not shown) on the solid foundation. The outer circumference of the substructure 10 _G is surrounded by a rising foundation 14, and a predetermined number of seismic isolation tables 15 ₁ to 15 ₁₂ (see FIG. 5A) are installed inside in this embodiment.

The plurality of seismic isolation tables 15 ₁ to 15 ₁₂ all have the same structure, and have a size of, for example, 900 mm in length × 900 mm in width × height (about 350 mm). The rising foundation 14 around the outer circumference is constructed with a predetermined clearance secured between it and the boundary line of the adjacent land. The lower structure 10 _G is not limited to this, and may be another basic structure, for example, a flat slab type.

As shown in FIG. 5A, the plurality of seismic isolation tables 15 ₁ to 15 ₁₂ are arranged at positions corresponding to the floor plans on the _{1st floor 10 1F of the house (see FIG. 4A).} These seismic isolation tables 15 ₁ to 15 ₁₂ are arranged in 4 rows vertically and 3 rows horizontally. Distance _y 1 1 column left are three MenShindai ₁₅ 1-15 ₃ given in Fig. 5B, _{y 2,} also, the second column three MenShindai ₁₅ 4-15 ₆ spacing _{y 1} the _y 2, 3 row are three MenShindai ₁₅ 7-15 ₉ spacing _{y 1, y} 2, 4 column are three MenShindai _{15 10-15 12} spacing _y 1, _{y 2} There are predetermined intervals x ₁ , x ₂ , x ₃ , x ₄ , and x ₁ between the columns.
These intervals are determined by the seismic isolation device used and used.

Since FPS-HP is used in this embodiment, one unit is arranged for every ^{10 m 2} of the building area (floor area of the first floor). As a result, each dimension becomes, for example, _{750 mm for y 1} , 3750 mm for y ₂ , 750 mm for _{x 1 , 3300 mm for x 2} , 4500 mm for x ₃ , and 2500 mm for x _4. The intervals at the bottom are finely matched to the irregular planar shape, x ₁ , x ₂ , x ₁ , x ₅ (3000 mm), x ₁ , x ₄ . It is divided into x _1.

Seismic isolation plates 19 _{1 to} 19 ₁₂ are arranged at positions corresponding to the plurality of _{seismic isolation tables 15 1 to 15 12.} The upper surface of these seismic isolation plates 19 _{1 to} 19 ₁₂ is coupled to the timber frame 21 (see FIG. 7), and the lower surface is coupled to the seismic isolation device 16. As shown in FIG. 5B, these seismic isolation plays 19 _{1 to} 19 _{12 are located at positions corresponding to the respective seismic isolation tables 15 1} to 15 ₁₂ , and are arranged in 4 rows vertically and 3 rows horizontally, and the arrangement dimensions are as follows. Is the same as y ₁ , y ₂ and x ₂ , x ₃ , and x ₄ above.

The seismic isolation plate will be described with reference to FIG. Note that FIG. 6 shows one of the seismic isolation plates shown in FIG. 5B, FIG. 6A is a plan view, and FIG. 6B is a partial cross-sectional view showing the bonding state between the seismic isolation plate and the solidified concrete body. FIG. 6C is a perspective view when a lower empty U-shaped reinforcing bar is provided on the seismic isolation plate.

The seismic isolation plate 19 shown in FIG. 6 is represented by _{one of a plurality of seismic isolation plates 19 1 to} 19 ₁₂ (see FIG. 5B), and is shown below in FIG. 5B. The specific configuration will be described with reference to the seismic isolation plate 19. Each seismic isolation plate 19 solves the above-mentioned two problems (torsional strength of the timber frame) and secures the floor surface rigidity required for the structural calculation. In this embodiment, each seismic isolation plate 19 has the same shape, is formed of a metal plate having a predetermined area and wall thickness, and has squares having the same lengths of four sides 19a to 19d. The length of the side is determined by the seismic isolation device used and used. That is, a certain remainder is added to the response displacement amount (movement amount) of the building during an earthquake of the seismic isolation device, and the added value is doubled or more.

In the present embodiment, the response displacement amount of FPS-HP is 405 mm, the constant remainder is 100 to 200 mm, and the double value of these total values is 1010 to 1210 mm. Therefore, in the present embodiment, the length of one side of the seismic isolation plate 19 is set to 1440 mm based on the above values. Therefore, the dimensions of the seismic isolation plate 19 are that the horizontal side a1 is 1440 mm, the vertical side b1 is 1440 mm, and the wall thickness is 12 mm. The wall thickness (12 mm) is also changed depending on the seismic isolation device adopted and used. As a result, the bonding area between the timber frame 21 and the seismic isolation plate 19 is increased, and the timber frame 21 and the seismic isolation plate 19 can be firmly coupled. The seismic isolation plate 19 is not limited to a square shape, but may be a rectangular shape, a so-called rectangular shape. In this case, the determination is made based on the length of the short side.

In this seismic isolation plate 19, a plurality of screw holes 19 _A are spaced along the sides close to the outer peripheral edge at predetermined intervals, and mounting bolts are internally fixed to the four corners of the upper anchor plate of the seismic isolation device. 20 insertion hole 19 _B (FIG. 6B see) for insertion are respectively bored. Further, as shown in FIGS. 6C and 2A, a plurality of lower empty U-shaped reinforcing bars 31 are arranged at predetermined intervals on the surface of the seismic isolation plate 19. The reinforcing bar are arranged on the inner side of the screw hole 19 _A which is formed in the outer peripheral edge. Since this reinforcing bar has a U-shaped lower space, it is used as a handle for carrying the seismic isolation plate, and also serves as a reinforcing material for the concrete solidified body 26. The relationship between the areas A1, A2, and A3 of the connecting planes of the timber frame frame 21 to which the seismic isolation device 16, the seismic isolation plate 19, and the concrete solidified body 26 are fixed will be described later.

The timbered frame will be described with reference to FIG. Note that FIG. 7 is a plan view of a timber frame frame supporting the seismic isolated wooden building of FIG. The timber-framed frame 21 is a stand that supports the load of the building, and since it is virtually impossible to install the seismic isolation device directly under the pillars of all the buildings, the axial force of the pillars of the building is transmitted to the seismic isolation device. Is for. The timbered frame 21 is formed by dividing an outer peripheral frame 22 having a space of a predetermined size inside and a plurality of inner frame members in the outer peripheral frame in a grid pattern at predetermined intervals in the vertical and horizontal directions. A plurality of lattice frames 30 having a size are formed. The outer peripheral frame 22 and the inner frame material are each made of a laminated material. The laminated material is wood obtained by laminating and adhering a large number of thin sawn boards such as veneers, and has high strength.

Peripheral frame 22 has a shape corresponding to the rising basis 14 of the undercarriage 10 _G, it is formed by a plurality of outer frame member ₂₂ 1-22 _8. That is, it is formed by processing and joining columnar bodies having a predetermined shape and thickness made of laminated lumber so as to have a shape corresponding to the rising foundation. The columnar body is preferably a square column. Its dimensions are, for example, 120 mm in width and 300 mm in height. In FIG. 7A, the horizontal length is 11,800 mm and the vertical length is 9000 mm, and the subdivided lengths c ₁ is 1500 mm, c ₂ is 1800 mm, c ₃ is 3000 mm, c ₄ is 1000 mm and d ₁ is. 1500 mm and d ₂ are 2250 mm.

The plurality of inner frame members are composed of a vertical frame member 23, a horizontal frame member 24, and a jumpsuit frame member 25, and are formed of a square pillar made of a laminated lumber having a predetermined thickness. Vertical frame member 23 is two square pillar ₂₃ 1, 23 _2, the horizontal frame member 24 consists of two quadrangular prism ₂₄ 1-24 _4, in jumpsuit frame member 25 also two square pillar ₂₅ 1, 25 ₂ It is formed. By dividing the inside of the outer peripheral frame into a grid pattern with these inner frame materials, a grid frame 30 having a predetermined space inside is formed. Of these plurality of lattice frames 30, concrete solidified bodies 26 are formed in the spaces (frame spaces) in the lattice frames 30 corresponding to the _{seismic isolation devices 16 1 to} 16 _12.

Here, a method of forming this solidified concrete body will be described with reference to FIG. 2A. The following is a description of one solidified body. First, the seismic isolation device 16 is installed on the seismic isolation table 15. In this installation, a lower anchor plate 32 is provided at the lower part of the seismic isolation device 16, and a bolt (not shown) for fixing the seismic isolation device 16 is inserted into the insertion hole of the lower anchor plate 32 and embedded in the seismic isolation table 15. Fix with concrete. Next, the upper anchor plate 33 is attached to the upper part of the seismic isolation device 16. Although not shown, the upper anchor plate 33 is inserted into the seismic isolation plate 19 at four corners, and holes for inserting fixing bolts for fixing to the concrete solidified body 26 are formed at the four corners.

Further, in the timber frame 21, the surface (upper surface) of the seismic isolation plate 19 is brought into contact with the lower part of the lattice frame 30 in advance, and the screw screw 20 is inserted into _{each screw hole 19 A around the outside of the seismic isolation plate 19.} Then, it is screwed to the lower part of the peripheral frame (outer peripheral frame 22, vertical frame material 23, horizontal frame material 24, connecting frame material 25) of the lattice frame 30.
Next, the timbered frame 32 is moved onto the base seismic isolation table 15 and placed on the seismic isolation device 16 on the seismic isolation table 15. At that time, the upper anchor plate 33 of each seismic isolation device 16 Insert and fix mounting bolts (not shown) at the four corners (insertion holes).

When the timber frame 21 is placed on the seismic isolation device 16, the mounting bolts project into the grid frame from _{the insertion hole 19 B of the seismic isolation plate 19.} The opening at the bottom of the lattice frame 30 is covered with the seismic isolation plate 19, the mounting bolts project inside, and a predetermined size frame space with an opening at the top is formed. An inverted U-shaped reinforcing bar 31 is contained in this frame space.

After that, the frame space is filled with concrete, solidified, and the frame space is filled with concrete. Then, the concrete solidified body 26 is formed in the space of the lattice frame 30. With the concrete solidified body 26, the seismic isolation device 16 is firmly fixed to the timber frame 21 via mounting bolts, and the concrete solidified body 26 is reinforced by the lower empty U-shaped reinforcing bar 31.

It is preferable to use non-shrink mortar (grout) as the concrete to be used. The dimensions of the concrete solidified body 26 are, for example, 120 mm in length and width and 210 mm in height h. In the formation of the concrete solidified body 26, since the lattice frame 30 can be used as a concrete filling formwork, a dedicated formwork becomes unnecessary, and the seismic isolation plate 19 and the seismic isolation device are formed by filling and solidifying the concrete. The bond with 16 becomes firm, and since the concrete solidified body 26 is heavier than wood, it becomes a heavy object and the weight of the wooden formwork 21 can be increased. The timber-framed frame 21 shown in FIGS. 2 and 7 shows a state in which a solidified concrete body is formed.

By forming the concrete solidified body 26 in the lattice frame 30 of the timber frame 21 in this way, the concrete solidified body 21 becomes a heavy object, and is arranged and fixed substantially evenly and in a well-balanced manner in the lattice-shaped frame. And they are tightly coupled within the grid frame. As a result, the weight of the timber frame 21 increases.

To construct a seismic isolation structure and a seismic isolated wooden house equipped with the seismic isolation structure using the members described above, the following steps are performed. With reference to FIG. 2, first, a substructure 10 _G is constructed on the ground, and seismic isolation devices 16 are installed on a plurality of seismic isolation tables 15 in the _{seismic isolation layer 10 D.} Next, a seismic isolation plate 19 is interposed between them to fix the timber frame 21. A structural plywood 28 is installed on the timbered frame, and a finished floor 29 is laid and contacted on the structural plywood 28. In the timber frame 21, there is a gap between the frame material and the concrete solidified body 26 because of the difference in height, so the heat insulating material 27 is packed in this gap. After that, a wooden house is constructed on the timber frame 21. This construction is the same as traditional architecture. The description is omitted.

The constructed seismic isolation structure 11 compares the areas of the connecting planes of the seismic isolation device 16, the seismic isolation plate 19, and the timbered frame 21 to which the concrete solidified body 26 is fixed as A1, A2, and A3. (A).
A2> A1, A2> A3 ... (a)
In this relational expression (a), the area A2 of the seismic isolation plate 19 is determined by the seismic isolation device adopted and used. That is, when the seismic isolation plate is made square, the length of one side of the seismic isolation plate 19 is the building at the time of an earthquake. A certain remainder is added to the response displacement amount (movement amount) of the above to make the length more than twice the added value, and the area is calculated by this length. The seismic isolation plate is not limited to a square shape, but may be a rectangular shape, a so-called rectangular shape. In this case, it is determined based on the length of the short side. Response amount The displacement amount and the remainder differ depending on the seismic isolation device used and used.

The seismic isolation structure satisfies the condition of the above relational expression (a), and the floor surface rigidity (rigidity satisfying the criteria shown in the seismic isolation notification) required in the structural calculation, that is, in-plane shear rigidity and out-of-plane bending. Rigidity and torsional rigidity can be ensured.

According to the seismic isolation structure of this embodiment, first, since the timber frame is made of wood, it is cheaper, easier to process, and easier to manufacture than other concrete or steel frames. In addition, since the concrete solidified body is incorporated and fixed in the lattice frame corresponding to the seismic isolation device in a substantially even and well-balanced manner, the weight is reduced and the concrete is solid. In addition, the seismic isolation plate is fixed so that it becomes solid. As a result, in the wooden frame pedestal, problems that occur with the seismic isolation device, for example, strong tightening strength can be secured by connecting with the seismic isolation device, and the floor surface rigidity required for structural calculation. It is possible to simplify and simplify the construction method and shorten the construction period, and it is easy to apply it to wooden houses with a total low cost.

In addition, the seismic isolated wooden building of this embodiment is provided with this seismic isolated structure, so that the construction method can be simplified and simplified, the construction period can be shortened, and the total cost can be reduced. It is possible to make a house design with an irregular plane shape or a three-dimensional shape with many.

10 seismic isolation wooden structure 10G undercarriage 10D isolation layer 10 _F superstructure (wooden buildings)
11 seismic isolation structure 14 rising underlying 15,15 _{1-15 12} MenShindai 16,16 _{1-16 12} seismic isolation device 19, 19 _{1-19 12} seismic isolation plate 21 half-timbered frame 22 peripheral frame 23 vertical frame member 24 horizontal Frame material 25 Tsunagi frame material 26 Concrete solidified body 27 Insulation material 28 Structural plywood 29 Finished floor 30 Lattice frame 31 Lower empty U-shaped reinforcing bar 32 Lower anchor plate 33 Upper anchor plate

The seismic isolation structure of the first aspect of the present invention includes a foundation constructed on the ground, a plurality of seismic isolation devices arranged on the foundation, and a plurality of seismic isolation devices fixed to each of the seismic isolation devices. It is a seismic isolation structure equipped with a seismic isolation plate and a wooden frame base on which each of the seismic isolation plates is fixed to support a wooden building.
The timbered frame is formed by forming an outer peripheral frame having a space of a predetermined size inside and a plurality of inner frame members formed by dividing a plurality of inner frame members in a grid pattern at predetermined intervals in the vertical and horizontal directions. Has a grid frame and
Among the plurality of lattice frames, the timber frame abuts the seismic isolation plate on the lattice frame corresponding to the seismic isolation device, and fixes each seismic isolation device to the lower surface of these seismic isolation plates. Then, the upper surface is fixed to the peripheral frame of the lattice frame to form a frame space of a predetermined size in each lattice frame, and a concrete solidified body or mortar formed by filling and solidifying concrete in the frame space. It is characterized in that a solidified mortar formed by filling and solidifying is arranged.

Further, the seismic isolation structure of the second aspect of the present invention is the seismic isolation device of the first aspect, wherein the seismic isolation device, the seismic isolation plate and the concrete solidified body or the mortar solidified body are fixed. When the areas of the connecting planes of the pedestals are A1, A2 and A3, respectively, these have the following relationships.
A2> A1, A2> A3
It is characterized by being in.

Further, in the seismic isolation structure of the third aspect of the present invention, in the seismic isolation structure of the first or second aspect, the outer peripheral frame and the lattice frame constituting the timber frame are both formed of laminated materials. The solidified mortar is made of non-shrinkable mortar.

Further, in the seismic isolation structure according to the fourth aspect of the present invention, in any of the first to second seismic isolation structures, a plurality of lower empty U-shaped reinforcing bars are provided on the upper surface side of the seismic isolation plate. It is and said plurality of lower idle U-shaped reinforcing bar is characterized in that it is embedded in the concrete solidified body or the mortar solidified body.

According to the seismic isolation structure of the first aspect of the present invention, the weight of the timbered frame is increased due to the presence of the concrete solidified body or the mortar solidified body in the frame space, and it is possible to withstand a high wind load and further enhance the safety. be able to. In addition, issues with the seismic isolation device, for example, the strong tightening strength can be secured by combining with the seismic isolation device, and the floor rigidity required for structural calculation is secured, and the construction method can be simplified and simplified. The construction period can be shortened, and the total cost can be reduced, making it possible to apply it to wooden houses.

According to the seismic isolation structure of the second aspect of the present invention, the areas of the connecting planes of the seismic isolation device, the seismic isolation plate and the timber frame frame to which the concrete solidified body or the mortar solidified body are fixed are set to A1, A2 and A3, respectively. Since their sizes are A2> A1 and A2> A3, the floor surface rigidity required by the structural calculation can be secured. That is, the timber frame can secure the rigidity satisfying the criteria shown in the seismic isolation notification by the in-plane shear rigidity, the out-of-plane bending rigidity and the torsional rigidity.

According to the seismic isolation structure of the third aspect of the present invention, since the outer peripheral frame and the lattice frame constituting the timber frame are both made of laminated materials, they can be easily obtained, processed, and manufactured at low cost. Further, the mortar solidified since using non-shrink mortar, coupled with seismic isolation plates and half-timbered frame is firmly.

According to the seismic isolation structure of the fourth aspect of the present invention, since a plurality of open U-shaped reinforcing bars are provided on the upper surface side of the seismic isolation plate, the seismic isolation plate can be easily carried during construction. Further, rebar construction completion plurality under free U-shaped in since being embedded in concrete solidified body or mortar solidified body, strength of the concrete solidified body or mortar solidified increases.

Claims (5)

A foundation constructed on the ground, a plurality of seismic isolation devices arranged on the foundation, a plurality of seismic isolation plates fixed to each seismic isolation device, and each seismic isolation plate are fixed. It is a seismic isolation structure equipped with a wooden frame foundation that supports a wooden building.
The timbered frame is formed by forming an outer peripheral frame having a space of a predetermined size inside and a plurality of inner frame members formed by dividing a plurality of inner frame members in a grid pattern at predetermined intervals in the vertical and horizontal directions. Has a grid frame and
The wooden frame mount abuts the seismic isolation plate on the lattice frame corresponding to the seismic isolation device among the plurality of lattice frames, and fixes each seismic isolation device to the lower surface of the seismic isolation plate. Then, the upper surface is fixed to the peripheral frame of the lattice frame to form a frame space of a predetermined size in each lattice frame, and a concrete solidified body formed by filling and solidifying concrete in the frame space is arranged. A seismic isolation structure that is characterized by being concrete. When the areas of the contact joint surfaces of the seismic isolation device, the seismic isolation plate, and the solidified concrete body of the timber frame are A1, A2, and A3, respectively, these have the following relationships.
A2> A1, A2> A3
The seismic isolation structure according to claim 1, wherein the seismic isolation structure is provided in 1. Claim 1 or 2, wherein the outer peripheral frame and the lattice frame constituting the timber frame are both formed of a laminated material, and the concrete solidified body is formed of a non-shrink mortar. Seismic isolation structure described in. A plurality of lower empty U-shaped reinforcing bars are provided on the upper surface side of the seismic isolation plate, and the plurality of lower empty U-shaped reinforcing bars are embedded in the concrete solidified body. The seismic isolation structure according to any one of claims 1 to 3. A wooden seismic isolation building characterized by having the seismic isolation structure according to any one of claims 1 to 4.

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