JP5145282B2 - Seismic isolation system for wooden buildings - Google Patents

Description

  The present invention relates to a seismic isolation structure for a wooden building, and more particularly to a seismic isolation structure for a wooden building applied to an existing wooden building.

  As a seismic isolation structure of a wooden building, as disclosed in Patent Document 1, a structure in which a small seismic isolation device is installed between a building frame and a fabric foundation, or disclosed in Patent Document 2. As shown, a structure in which an upper base and a lower base are provided, and a base isolation material is laminated between the upper surface of the bottom portion of the lower base and the lower surface of the base portion of the upper base has been proposed.

  As for the seismic isolation bearing, Patent Document 1 discloses a high-damping laminated rubber that is a seismic isolation device, and Patent Document 2 uses a sliding bearing that is a seismic isolation material. Are disclosed.

  On the other hand, Patent Document 3 discloses a urethane elastomer composition for a seismic isolation bearing and a seismic isolation bearing in which the urethane elastomer composition is laminated. It is described that this urethane elastomer composition is a support having a low shear elastic modulus, a high strength, and a restoring force even in a large strain region.

  Hydrophilic urethane (polyisocyanate compound), which is a kind of this urethane elastomer composition, has characteristics that water is used as a curing agent, dissolves and disperses with water, causes urea bonding, and forms a rubber elastic gel in a short time. For this reason, it is used as a ground strengthening agent for dealing with soft ground or a water stopping agent for dealing with water leakage in civil engineering works.

  Further, the two-component foamed hard urethane has a property of being cured by mixing a first liquid mainly composed of isocyanate and a second liquid mainly composed of polyol. This two-component foamed rigid urethane is a urethane elastomer composition having a low shear modulus and high strength, and a support having a restoring force even in a large strain region.

JP 2000-38856 A JP-A-9-125413 JP 2000-35072 A

  As a seismic isolation structure or seismic isolation method for wooden buildings, a structure that provides a seismic isolation support between the building frame and the foundation, or a structure that provides a seismic isolation support in the upper and lower foundations, etc. It must be designed to incorporate seismic isolation bearings into the building at the time of design. In addition, there may be a case where a space must be provided in order to incorporate the seismic isolation bearing in a building, or design restrictions may occur on other members in order to install the seismic isolation bearing.

  In addition, the work of incorporating a seismic isolation bearing into an existing building is not easy due to problems such as jacking up the building and cost and construction time. This is due to the fact that conventional seismic isolation structures for buildings must have seismic isolation supports in the structure of the building, such as between the building frame and the foundation.

  The object of the present application is to solve such problems and to provide a wooden building seismic isolation structure in which a seismic isolation support can be incorporated in an existing wooden building by a simple method.

  In order to achieve the above object, a wooden building seismic isolation structure according to the present invention includes a first liquid mainly composed of isocyanate, which is injected into a soil at the bottom of a base structure of a wooden building by a chemical injection pipe, and a polyol. The two-component foamed rigid urethane mixed with the second liquid mainly composed of a two-component foamed hard urethane layer is formed to form a two-component foamed rigid urethane layer. It is characterized by seismic isolation of the foundation structure and the ground.

  With the above-described configuration, the wooden building seismic isolation structure is a two-component foamed rigid material obtained by mixing the first liquid mainly composed of isocyanate and the second liquid mainly composed of polyol at the bottom of the basic structure of the wooden building. Urethane is cured to form a two-component foam-cured urethane layer. With this two-component foam-cured urethane, a seismic isolation layer can be formed between the foundation and the ground by a simple method even in an existing wooden building.

  In addition, in the wooden building seismic isolation structure, the liquid foam-cured urethane is increased in volume by foaming by mixing the first liquid and the second liquid, and the foundation structure is pushed up by this increase in volume. It is preferable that the weight of the wooden structure is loaded on the two-component foam-cured urethane layer. Thereby, a liquid foam hardening urethane layer can become a support body of a wooden building.

  Moreover, it is preferable that a base structure of a wooden building seismic isolation structure is in contact with the ground via a two-component foam-cured urethane layer. Thereby, this wooden building seismic isolation structure can demonstrate the seismic isolation effect with the restoring force of two-component foam hardening urethane with respect to the earthquake motion transmitted from the ground to a building.

  In addition, the seismic isolation structure for wooden buildings is the base structure for the seismic isolation structure for wooden buildings by using a liquid injection pipe installed at an angle of about 45 degrees from the side of the foundation structure. It is preferable to be poured into the soil at the bottom of the soil. Thereby, even if it is an existing wooden building, a support body can be easily formed from the side of the foundation structure which is an empty space around the building.

  In order to achieve the above-mentioned object, the wooden building seismic isolation structure according to the present invention is injected into the soil at the bottom of the base structure of the wooden building by the injection pipe and stirred by the high-pressure water and the chemical injection pipe. Hydrophilic urethane injected into the soil reacts to form a gelled hydrophilic urethane layer at the bottom of the foundation structure, and the restoring force of the gelled hydrophilic urethane layer provides the foundation structure and ground of the wooden building. It is characterized by seismic isolation.

  With the above configuration, in the wooden building seismic isolation structure, a hydrophilic urethane layer is formed at the bottom of the basic structure of the wooden building. And the hydrophilic urethane inject | poured into the soil stirred by the high pressure water hardens | cures with a water | moisture content in the bottom part of a basic structure, and becomes a rubber elastic gel. The gelled hydrophilic urethane can form a base isolation layer between the foundation and the ground by a simple method even in an existing wooden building.

  In addition, the seismic isolation structure for wooden buildings is such that hydrophilic urethane expands by reacting with high-pressure water, increasing its volume, and this increase in volume boosts the basic structure, and the weight of the wooden building becomes hydrophilic urethane. Preferably it is loaded on a layer. Thereby, a hydrophilic urethane layer can become a support body of a wooden building by this.

  As described above, according to the wooden building seismic isolation structure and the seismic isolation method according to the present invention, the wooden building seismic isolation structure and the seismic isolation method can be incorporated into the existing wooden building by a simple method. Can be provided.

It is sectional drawing of the wooden building which shows schematic structure of embodiment of the wooden building seismic isolation structure which concerns on this invention. It is a top view which shows the example of the injection | pouring position by a chemical | medical solution injection pipe with respect to arrangement | positioning of the fabric foundation of a foundation structure.

  Below, it demonstrates in detail about embodiment of the seismic isolation structure of the wooden building which concerns on this invention using drawing.

  In FIG. 1, schematic structure of embodiment of the seismic isolation structure of the wooden building which concerns on this invention is shown. In general, a wooden building 10 is provided with a foundation 7 such as a cloth foundation or an independent foundation as a framework foundation structure 11 composed of pillar members 5 and beam members 6. This foundation 7 is installed on a crushed stone or a cut crushed stone 9 laid on the excavated ground 8. In the present wooden building seismic isolation structure 1, the two-component foam-cured urethane layer 2 or the hydrophilic urethane layer 3 is formed at the bottom of the foundation 7 that is the foundation structure 11 of the wooden building 10.

  In FIG. 2, the example of the injection | pouring position by the chemical | medical solution injection pipe 4 with respect to arrangement | positioning of the fabric foundation 7 of the foundation structure 11 is shown. The chemical solution injection pipe 4 is installed outside the foundation structure 11 with respect to the outer fabric foundation 7. Moreover, the chemical | medical solution injection pipe 4 is installed in the side surface of the cloth foundation 7 about the internal cloth foundation 7. FIG. Then, the two-component foam-cured urethane layer 2 or the hydrophilic urethane layer 3 is formed on the bottom of almost all the fabric foundations 7.

(Seismic isolation structure for wooden buildings with a two-component foam-cured urethane layer)
As shown in FIG. 1, the two-component foam-cured urethane is injected at an angle of approximately 45 degrees from the side of the base structure 11 through the chemical solution injection pipe 4. A container (not shown) for containing the first liquid mainly composed of isocyanate and a container (not shown) for containing the second liquid mainly composed of polyol, which constitute the two-component foam-cured urethane. Each contains a foaming agent, whereby the liquid is discharged out of the container. An exothermic chemical reaction takes place by forming the mixture by mixing the first liquid and the second liquid approximately 1: 1 to form a foam. After injecting the mixed liquid into the bottom of the base structure 11, the mixed liquid foams 5 to 8 times, the surface is cured in 30 to 60 seconds, and is cured to the inside in 2 to 5 minutes. This cured two-component foam-cured urethane forms a two-component foam-cured urethane layer 2 that is a rubber elastic gel layer in the soil.

  The base structure 11 of the wooden building 10 is lifted by an increase in volume due to foaming of the two-component foam-cured urethane, and the weight of the wooden building 10 is loaded on the two-component foam-cured urethane layer 2 by the lift of the base structure 11. The two-component foam-cured urethane layer 2 functions as a support for the wooden building 10.

  This two-component foam-cured urethane layer 2 has a low shear elastic modulus, a high strength, and a restoring force even in a large strain region. That is, when seismic motion occurs in the ground, the two-component foam-cured urethane layer 2 undergoes shear deformation between the bottom surface of the foundation 7 and the ground 8 and absorbs the energy of seismic motion. And the base structure 11 and the ground 8 of the wooden building 10 are seismically isolated by the restoring force. That is, the two-component foam-cured urethane layer 2 absorbs the energy of the earthquake motion, so that the energy of the earthquake motion input to the wooden building 10 is attenuated, and the wooden building 10 can be prevented from being damaged or collapsed. .

  Since this two-component foam-cured urethane is originally used as a heat insulating material, its performance is maintained for a long period of time.

  If the ground is soft ground, the lateral movement of the foundation 7 is not constrained by the lateral pressure of the side, and there is little impact on the seismic isolation effect, but if the ground is not soft ground, the lateral pressure of the foundation 7 The seismic isolation effect may decrease due to restraint. In this case, as shown by the broken line (L) in FIG. 1, the soil on the side surface of the foundation 7 may be cut out so that the foundation 7 contacts only the two-component foam-cured urethane layer 2. As a result, the base structure 11 comes into contact with the ground 8 only via the two-component foam-cured urethane layer 2.

(Seismic isolation structure for wooden buildings with hydrophilic urethane layer)
As shown in FIG. 1, hydrophilic urethane is injected at an angle of approximately 45 degrees from the side of the base structure 11 through the chemical liquid injection pipe 4. This hydrophilic urethane uses water as a curing agent, dissolves and disperses with water to cause urea bonding, and forms a rubber elastic gel in a short time. After injecting the hydrophilic urethane, the driving angle is fixed at about 45 degrees, and the soil around the bottom of the foundation 7 is agitated while injecting water at a high pressure. The injected high-pressure water cures the hydrophilic urethane in the hydrophilic urethane layer 3. The hydrophilic urethane cured by water forms a hydrophilic urethane layer 3 that is a layer of a rubber elastic gel in the soil.

  The foundation structure 11 of the wooden building 10 is lifted by an increase in volume due to the expansion of the hydrophilic urethane by reacting with water, and the lifting of the foundation structure 11 causes the weight of the wooden building 10 to the hydrophilic urethane layer 3. The hydrophilic urethane layer 3 is loaded and functions as a support body of the wooden building 10.

  The hydrophilic urethane layer 3 has a low shear elastic modulus, a high strength, and a restoring force even in a large strain region. That is, when seismic motion occurs on the ground, the hydrophilic urethane layer 3 undergoes shear deformation between the bottom surface of the foundation 7 and the ground 8 to absorb energy of the seismic motion. And the base structure 11 and the ground 8 of the wooden building 10 are seismically isolated by the restoring force. That is, the hydrophilic urethane layer 3 absorbs the energy of the seismic motion, whereby the seismic energy input to the wooden building 10 is attenuated, and the wooden building 10 can be prevented from being damaged or collapsed.

  Since hydrophilic urethane is also used as a reinforcing agent in soft ground, its performance is maintained for a long period of time.

  If the ground is soft ground, the lateral movement of the foundation 7 is not constrained by the lateral pressure of the side, and there is little impact on the seismic isolation effect, but if the ground is not soft ground, the lateral pressure of the foundation 7 The seismic isolation effect may decrease due to restraint. In this case, as shown by a broken line (L) in FIG. 1, the soil on the side surface of the foundation 7 may be cut out so that the foundation 7 contacts only the gelled hydrophilic urethane layer 3. As a result, the base structure 11 comes into contact with the ground 8 through the gelled hydrophilic urethane layer 3.

  1 Wooden building seismic isolation structure, 2 2 liquid foam cured urethane layer, 3 hydrophilic urethane layer, 4 (chemical solution) injection pipe, 5 pillar material, 6 beam material, 7 foundation or cloth foundation, 8 ground, 9 chestnut or Cut crushed stone, 10 wooden building, 11 foundation structure.

Claims (4)

  The high-pressure water that is injected into the soil at the bottom of the foundation structure in a wooden building by the injection pipe and agitates the soil reacts with the hydrophilic urethane that is injected into the soil through the chemical injection pipe, and gels at the bottom of the foundation structure. A wooden building seismic isolation structure, which forms a hydrophilized urethane layer and segregates the basic structure and ground of the wooden building by the restoring force of the gelled hydrophilic urethane layer. It is a wooden building seismic isolation structure according to claim 1 , wherein the hydrophilic urethane is foamed by reacting with high-pressure water and hardens by increasing its volume, and the increase in the volume pushes up the foundation structure, A wooden building seismic isolation structure characterized in that the weight of the wooden structure is loaded on the hydrophilic urethane layer. The wooden building seismic isolation structure according to claim 1 or 2 , wherein the foundation structure is in contact with the ground via a gelled hydrophilic urethane layer. The wooden building seismic isolation structure according to any one of claims 1 to 3 , wherein the hydrophilic urethane is formed at a bottom portion of the foundation structure by a chemical injection pipe installed at an angle of approximately 45 degrees from the side of the foundation structure. Seismic isolation structure for wooden buildings, which is characterized by being injected into the soil.

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