JP6388358B1 - Building, buoyant body construction method and building manufacturing method - Google Patents

Abstract

[PROBLEMS] To provide a building, a method for constructing a buoyant body, and a method for producing a building, which can stably secure necessary buoyancy with an inexpensive configuration.
A building 10 includes a building main body 14 having a roof 36 constituting an attic space S, and a buoyancy body provided in the attic space S and imparting buoyancy to the building main body 14 when the building main body 14 is poured into water W. 16. The buoyancy body 16 is configured by an amount of the resin foam 16 a that can float at least a part of the roof 36 above the water surface X. As the resin foam 16a, a hard urethane foam can be used. When the resin foam 16a is filled in the attic space S, the resin foam 16a is sprayed into the attic space S, and the coupling portion 38 between the column 32 and the beam 24, or the coupling portion between the column 32 and the beam 34. 40 is attached.
[Selection] Figure 2

Description

  The present invention relates to a building including a building main body and a buoyant body, a method for constructing a buoyant body that imparts buoyancy to the building main body, and a method for manufacturing a building including the building main body and a buoyant body.

  There are various buildings with buoyancy bodies. As an example, Patent Document 1 below discloses a boat-type building including a rectangular floating body that is a kind of buoyancy body, and Patent Document 2 below is a building including an airbag that is a kind of buoyancy body. Is disclosed. According to these buildings, when a flood occurs due to a tsunami or heavy rain, the main body of the building can be floated above the water surface, so that the victims can be evacuated within the main body of the building.

JP 2007-192007 A JP2013-32686A

  However, the building described in Patent Document 1 has a problem in that the manufacturing cost increases because the rectangular floating body that supports the entire building body is large. Moreover, in the building described in the said patent document 2, since there exists a possibility that a hole may open in an airbag by contact with floating objects, such as debris, there exists a problem that it is difficult to ensure required buoyancy stably. there were.

  The present invention has been made to address the above problems, and provides a building, a method for constructing a buoyant body, and a method for producing a building that can stably secure necessary buoyancy with an inexpensive configuration. With the goal.

  In order to achieve the above object, the feature of the building according to the present invention is that a building body having a roof constituting an attic space and a buoyancy in the building body provided in the attic space when the building body is flushed with water. The buoyancy body is formed of a resin foam in an amount capable of floating at least a part of the roof above the water surface.

  In this configuration, at least a part of the roof can be lifted above the water surface by the buoyancy body, so that the victim can evacuate on the roof. Moreover, since it is not necessary to float the whole building main body, the quantity of a resin foam can be decreased and a buoyancy body can be comprised cheaply. Moreover, in the buoyancy body comprised with the resin foam, since buoyancy does not fall by an air leak etc., required buoyancy can be ensured stably. Furthermore, when the building body is washed away, the roof can be stably supported by the buoyant body provided in the attic space.

  Another feature of the building according to the present invention is that the resin foam is a hard urethane foam.

  In this configuration, since the hard urethane foam is used as the resin foam, the buoyancy body can be constructed by spraying, and the buoyancy body can be configured easily and inexpensively. Moreover, since the hard urethane foam has self-adhesiveness, the member can be reinforced by adhering it to members (columns, beams, roofs, etc.) constituting the attic space. Furthermore, since the hard urethane foam has heat insulation properties, it is possible to enhance the habitability of the building.

  Another feature of the building according to the present invention is that the building body has a column and a beam coupled to each other in the attic space, and the resin foam is in close contact with a coupling portion between the column and the beam. It is to be provided so as to cover this.

  In this configuration, since the resin foam is provided so as to be in close contact with and cover the coupling portion between the column and the beam, the resin foam can be integrated with the column and the beam to reinforce the coupling portion. it can. Therefore, even when the main body of the building is washed away by flooding, the coupled state between the pillar and the beam can be maintained, and the safety of the disaster victim evacuated to the roof can be secured. Moreover, when a column or a beam flows out, these integrated objects including the resin foam can be used as a floating body that the victim can grasp.

  Another feature of the building according to the present invention is that the roof has an inclined roof surface, and the buoyancy body is formed of a resin foam in an amount that does not allow the lower end of the roof surface to float above the water surface. There is in being.

  In this configuration, since the lower end of the inclined roof surface does not rise above the water surface, the victim is likely to rise from the water surface to the roof surface.

  Another feature of the building according to the present invention is that the roof is a triangular roof having two inclined roof surfaces.

  In this configuration, since the roof of the building body has two inclined roof surfaces, the disaster victim can climb one roof surface selected in consideration of safety and the like. For example, when a floating object such as rubble becomes an obstacle and it is difficult to approach one roof surface, it can climb to the other roof surface. Moreover, since the roof of a building main body is a triangular roof, it is easy to balance on both sides across the apex, and it is easy to stabilize the roof in water.

  Another feature of the building according to the present invention is that the buoyancy body is provided so as to fill the entire attic space.

  In this configuration, since the buoyancy body is provided so as to fill the entire attic space, the roof can be stably supported by the buoyancy body even when the building body is washed away by flooding.

  In order to achieve the above object, a buoyancy body construction method according to the present invention is a buoyancy body construction method for providing a buoyancy body on a building body having a roof constituting an attic space, and (a) the buoyancy body. And (b) an amount of the resin foam capable of floating at least a part of the roof above the water surface when the building body is flushed with water. And filling the attic space.

  In this configuration, the buoyancy body can be easily configured simply by filling the attic space with the resin foam. Since the amount of the resin foam is determined so that at least a part of the roof can float above the water surface, it is not necessary to float the entire building body, and the amount of the resin foam is reduced. The buoyancy body can be configured at low cost.

  Another feature of the method for constructing a buoyancy body according to the present invention is that the step (a) includes a step of mixing a polyisocyanate, a polyol and a foaming agent, and the step (b) includes the step (a). There exists in having the process of producing | generating a rigid urethane foam, spraying the mixture mixed at the process inside the said attic space.

  In this configuration, the hard urethane foam is generated while the material is sprayed into the interior of the attic space. Therefore, the construction is easy regardless of the shape of the attic space. Moreover, since the hard urethane foam has self-adhesive properties, the member can be reinforced by attaching it to members (columns, beams, roofs, etc.) constituting the attic space. Furthermore, since the hard urethane foam is excellent in heat insulating properties, it is possible to enhance the habitability of the building.

  In order to achieve the above object, a feature of a manufacturing method of a building according to the present invention is a manufacturing method of a building including a building main body having a roof constituting an attic space, and a buoyancy body for giving buoyancy to the building main body. And (a) preparing a resin foam for constituting the buoyancy body, and (b) levitating at least a part of the roof above the water surface when the building body is flushed with water. And filling the attic space with an amount of the resin foam that can be obtained.

  In this configuration, a building including a buoyant body can be easily manufactured by simply filling the attic space with the resin foam. Since the amount of the resin foam is determined so that at least a part of the roof can float above the water surface, it is not necessary to float the entire building body, and the amount of the resin foam is reduced. Buildings can be manufactured inexpensively.

  Another feature of the building manufacturing method according to the present invention is that the step (a) includes a step of mixing a polyisocyanate, a polyol and a foaming agent, and the step (b) includes the step (a). It has the process of producing | generating a hard urethane foam, spraying the mixture mixed by said inside of the said attic space.

  In this configuration, the hard urethane foam is generated while the material is sprayed into the interior of the attic space. Therefore, the construction is easy regardless of the shape of the attic space. Moreover, since the hard urethane foam has self-adhesiveness, the member can be reinforced by adhering it to members (columns, beams, roofs, etc.) constituting the attic space. Furthermore, since the hard urethane foam has heat insulation properties, it is possible to enhance the habitability of the building.

It is sectional drawing which shows the structure of the building which concerns on embodiment. It is sectional drawing which shows the state by which the building which concerns on embodiment was washed away by the flood. It is a figure which shows the manufacturing method of the building which concerns on embodiment, (A) is sectional drawing which shows the state which built the building main body on the foundation, (B) is the state which filled a part of resin foam into the attic space FIG. It is sectional drawing which shows the structure of the building which provided the buoyancy body so that the whole attic space might be filled. It is sectional drawing which shows the structure of the building which provided the block-shaped buoyancy body in the attic space. It is sectional drawing which shows the structure of the building which changed the roof.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a building, a buoyant body construction method, and a building manufacturing method according to the present invention will be described with reference to the drawings.

  Drawing 1 is a sectional view showing the composition of building 10 concerning an embodiment. FIG. 2 is a cross-sectional view showing a state where the building 10 is washed away by flooding. In each of these drawings, in order to facilitate the understanding of the present invention, some components are schematically shown in an exaggerated manner. Therefore, the dimensions and ratios between the constituent elements may be different from the actual product.

  As shown in FIG. 1, the building 10 includes a foundation 12 provided on the ground G, a building body 14 built on the foundation 12, and a buoyancy body 16. The building 10 of this embodiment is a wooden house, and many members (columns, beams, roofs, etc.) constituting the building body 14 are made of wood. However, the building of the present invention is not limited to a wooden house, and may be a house with a reinforced structure.

  The foundation 12 is a part that supports the building body 14 and is formed of reinforced concrete or the like. A plurality of anchor bolts 18 project upward from the upper surface of the foundation 12.

  The building body 14 has a wooden base 20 placed on the upper surface of the foundation 12, a wooden column 22 coupled to the upper surface of the foundation 20, and a wooden beam 24 coupled to the upper end of the column 22. ing. A through hole 20a is formed in the base 20, and an anchor bolt 18 is inserted into the through hole 20a. The base 20 is fixed to the foundation 12 by screwing the nut 26 onto the anchor bolt 18.

  A mortise 28 is formed in the upper surface of the base 20, and a mortise 30 is formed in the lower end of the column 22. The column 22 is joined to the base 20 by fitting the tenon 30 into the tenon hole 28. Therefore, as shown in FIG. 2, in the event of a flood due to a tsunami or heavy rain, the pillar 22 that has received the water W pressure is easily separated from the base 20, and the portion of the building body 14 above the base 20 is the water W. Washed away. Therefore, the amount of the resin foam 16a (FIG. 1) constituting the buoyancy body 16 of the present embodiment is determined based on the specific gravity and volume of the portion of the building body 14 above the base 20.

  However, depending on the structure of the building, the entire building body 14 including the base 20 may be caused to flow into the water W. In addition, only a portion (a portion including the roof 36) above the pillar 22 in the building main body 14 may be separated from other portions and flow into the water W. Therefore, the amount of the resin foam 16a (FIG. 1) constituting the buoyancy body 16 may be determined based on the specific gravity or volume of the portion that is considered to be actually flowed in the building body 14 according to the structure of the building. Good.

  As shown in FIG. 1, the building body 14 includes a wooden column 32, a wooden beam 34, and a roof 36 that form an attic space S above the beam 24. The lower end of the column 32 is coupled to the beam 24, and the upper end of the column 32 is coupled to the beam 34. A roof 36 is coupled to the beam 34. A coupling means (not shown) such as a fitting structure or a connection fitting is used for the coupling portion 38 between the column 32 and the beam 24 and the coupling portion 40 between the column 32 and the beam 34.

  The roof 36 shown in FIG. 1 is a triangular roof that forms the attic space S in cooperation with the pillar 32 and the beam 34, and has two roof surfaces 42 and 44 that are inclined in opposite directions with respect to the horizontal plane. Yes. The shape of the roof 36 of this embodiment is an isosceles triangle, and the apex 36 a of the roof 36 is located at the center of the building body 14. Therefore, when the building main body 14 is washed away, it is easy to balance on both sides of the apex 36a, and the roof 36 is easily stabilized in the water W.

The buoyancy body 16 shown in FIG. 1 is a portion that imparts buoyancy to the building body 14 when the building body 14 is washed away by flooding, and is composed of a resin foam 16a filled in the attic space S. Specifically, the resin foam 16a of the present embodiment is a hard urethane foam composed of closed cells having an expansion ratio of 30 to 60 times. Here, the rigid urethane foam refers to a polyisocyanate having two or more NCO (isocyanate) groups and a polyol having two or more OH (hydroxyl) groups, a catalyst (for example, an amine compound), a foaming agent (for example, , Water, fluorocarbon, etc.) and a foam stabilizer (for example, silicone oil), and the like, and a homogeneous plastic foam obtained by causing the foaming reaction and the resinification reaction to occur simultaneously.
The rigid urethane foam preferably has low water absorption or substantially no water absorption.

  If the type of the resin foam 16a is the same, the magnitude of the buoyancy generated by the buoyancy body 16 varies depending on the amount. That is, as the amount of the resin foam 16a filled in the attic space S increases, the buoyancy imparted to the building body 14 increases. In the present embodiment, the resin foam 16a is formed so as to generate 1 t of buoyancy per 20 kg, and the buoyancy body 16 is composed of an amount of the resin foam 16a that generates necessary buoyancy. The magnitude of the buoyancy generated by the resin foam 16a can be adjusted by changing the expansion ratio.

  As shown in FIG. 2, the victim M can evacuate to the roof 36 as long as at least a part of the roof 36 floats above the water surface X. Therefore, the buoyancy body 16 is composed of an amount of the resin foam 16a that can float at least a part of the roof 36 above the water surface X. Further, when the lower ends 42a and 44a of the roof surfaces 42 and 44 are lifted above the water surface X, it becomes difficult for the disaster victim M to climb to the roof surfaces 42 and 44, and as a result, it is difficult to evacuate to the roof 36. become. Therefore, the buoyancy body 16 is composed of the resin foam 16a in such an amount that the lower ends 42a and 44a of the roof surfaces 42 and 44 do not float above the water surface X. 1 and 2 show a state in which the buoyancy body 16 is configured as one lump, the buoyancy body 16 may be configured by being divided into a plurality.

  The resin foam 16a is provided in close contact with and covering the connecting portion 38 between the column 32 and the beam 24 and the connecting portion 40 between the column 32 and the beam 34. Since the hard urethane foam used as the resin foam 16a has self-adhesive properties, the bonding portions 38 and 40 can be reinforced by being attached to the surfaces of the columns 32 and the beams 24 and 34. Moreover, the roof 36 can be reinforced by attaching the resin foam 16 a to the back surface of the roof 36.

(Building method)
3A and 3B are diagrams illustrating a method for manufacturing the building 10, in which FIG. 3A is a cross-sectional view illustrating a state in which the building main body 14 is built on the foundation 12, and FIG. It is sectional drawing which shows the state with which the part was filled. When manufacturing the building 10, first, as shown in FIG. 3A, the foundation 12 is built on the ground G, and then the building body 14 is built on the foundation 12. Thereafter, as shown in FIG. 3B, the resin foam 16a is sprayed into the attic space S with a spray gun (not shown) to form the buoyancy body 16.

(Construction method of buoyancy body)
When the buoyant body 16 is provided in the building body 14, a preparation step (a) for preparing the resin foam 16a for constituting the buoyancy body 16, and a filling step (b) for filling the attic space S with the resin foam 16a. ) In this order. In this embodiment, the resin foam 16a is sprayed into the attic space S with a spray gun (not shown) to form the buoyancy body 16, so that the preparation step (a) and the filling step (b) proceed almost simultaneously. To do.

  In the preparation step (a), materials such as polyisocyanate, polyol, catalyst, foaming agent and foam stabilizer are supplied to the spray gun. At this time, the polyisocyanate and the polyol are supplied to the spray gun from different routes (such as a hose). Then, the trigger is pulled with the nozzle directed toward the interior of the attic space S. Then, each of the above materials is sprayed from the nozzle into the attic space S while being mixed inside the spray gun. The jetted mixture is foamed at a foaming ratio of 30 to 60 times to become a resin foam 16a (hard urethane foam).

  In the filling step (b), the resin foam 16a generated in the preparation step (a) is sprayed and filled into the attic space S. At this time, the resin foam 16a can be attached to the surfaces of the joint portions 38 and 40 to reinforce the joint portions 38 and 40, and the roof 36 is attached by attaching the resin foam 16a to the back surface of the roof 36. It can also be reinforced. The strength of reinforcement can be increased by spraying the resin foam 16a in layers on the surfaces of the coupling portions 38 and 40 and the back surface of the roof 36. Moreover, the rigidity of a roof can further be improved by making the resin foam 16 adhere to the surface of the coupling | bond part 38,40 and the back surface of the roof 36 integrally.

  The filling amount of the resin foam 16a in the filling step (b) is set to an amount that allows at least a part of the roof 36 to float above the water surface X when the building body 14 is poured into the water W. Further, the amount is set such that the lower ends 42a and 44a of the roof surfaces 42 and 44 are not lifted above the water surface X. As shown in FIG. 2, in the building 10 of the present embodiment, the pillar 22 is separated from the base 20, and the portion of the building main body 14 above the base 20 is caused to flow into the water W. Therefore, the filling amount is determined based on the specific gravity and volume of the portion of the building body 14 above the base 20.

(Effect of embodiment)
According to the present embodiment, the following effects can be achieved by the above configuration. That is, as shown in FIG. 2, at least a part of the roof 36 can be lifted above the water surface X by the buoyancy body 16, so that the disaster victim M can evacuate on the roof 36. Moreover, since it is not necessary to float the whole building main body 14, the quantity of the resin foam 16a which comprises the buoyancy body 16 can be decreased, and the buoyancy body 16 can be comprised cheaply. Further, in the buoyancy body 16 constituted by the resin foam 16a, the buoyancy does not decrease due to air leakage or the like, so that the necessary buoyancy can be secured stably. Furthermore, when the building main body 14 is washed away, the roof 36 can be stably supported by the buoyancy body 16 provided in the attic space S.

  Since a hard urethane foam is used as the resin foam 16a shown in FIG. 1, the buoyancy body 16 can be constructed by spraying, and the buoyancy body 16 can be configured easily and inexpensively. Further, since the hard urethane foam has self-adhesiveness, these members can be reinforced by adhering them to the pillars 32, the beams 34, the roof 36, and the like constituting the attic space S. Furthermore, since the hard urethane foam has heat insulating properties, the comfortability of the building 10 can be enhanced.

  As shown in FIG. 1, the resin foam 16a is provided so as to be in close contact with and cover the coupling portion 38 between the column 32 and the beam 24 and the coupling portion 40 between the column 32 and the beam 34. The resin foam 16a can be integrated with the column 32 and the beams 24, 34 to reinforce the coupling portions 38, 40. Therefore, even when the building body 14 is washed away by flooding, the coupled state of the coupling portions 38 and 40 can be maintained, and the safety of the disaster victim M evacuated to the roof 36 can be ensured. Moreover, when the pillar 32 and the beam 34 flow out, these integrated objects including the resin foam 16a can be used as a floating body that the victim M holds.

  As shown in FIG. 2, the buoyancy body 16 is composed of a resin foam 16 a in an amount that does not allow the lower ends 42 a and 44 a of the roof surfaces 42 and 44 to float above the water surface X. That is, the lower ends 42 a and 44 a of the inclined roof surfaces 42 and 44 do not float above the water surface X. Therefore, it is easy for the victim M to climb from the water surface X to the roof surfaces 42 and 44.

  As shown in FIG. 2, since the roof 36 of the building body 14 has two roof surfaces 42 and 44 that are inclined, the disaster victim M climbs to one roof surface selected in consideration of safety or the like. be able to. For example, when floating objects (not shown) such as debris become an obstacle and it is difficult to approach one roof surface 42 (44), it is possible to climb to the other roof surface 44 (42). Moreover, since the roof 36 of the building body 14 is a triangular roof, it is easy to balance on both sides of the apex 36a, and the roof 36 is easily stabilized in the water W.

  As shown in FIG. 3B, the building 10 including the buoyant body 16 can be easily manufactured by simply filling the attic space S with the resin foam 16a. Moreover, since the hard urethane foam as the resin foam 16a is generated while spraying a material inside the attic space S, the construction is easy regardless of the shape of the attic space S.

(Modification)
In carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention. For example, in the said embodiment, although the hard urethane foam is used as the resin foam 16a, the kind of resin foam 16a is not specifically limited, A phenol foam, a polystyrene foam, etc. are used. Also good.

  In the above embodiment, the buoyancy body 16 is composed of the resin foam 16a in such an amount that the lower ends 42a, 44a of the roof surfaces 42, 44 are not lifted above the water surface X. However, the buoyancy body 16 has the lower ends 42a. , 44a may be made up of an amount of the resin foam 16a that floats above the water surface X. Even in this case, the disaster victim M can climb the roof 36 by providing a ladder or the like.

  FIG. 4 is a cross-sectional view showing a configuration of a building 50 in which the buoyant body 48 is provided so as to fill the entire attic space S. In the building 10 shown in FIG. 1, the buoyant body 16 is partially provided around the coupling portions 38 and 40 inside the attic space S. However, like the building 50 shown in FIG. It may be provided so as to fill the entire attic space S. The buoyancy body 48 is composed of a resin foam 16a similar to the buoyancy body 16, and is filled in the attic space S by spraying. According to this configuration, the roof 36 can be stably supported by the buoyancy body 16 even when the building body 14 is flushed with water W. Moreover, the heat insulation of the attic space S can be improved and the habitability of the building 50 can be improved.

  FIG. 5 is a cross-sectional view showing a configuration of a building 54 in which a block-like buoyancy body 52 is provided in the attic space S. As shown in FIG. 3 (B), in the building 10 of the above embodiment, the buoyant body 16 is sprayed and filled into the interior of the attic space S. However, like the building 54 shown in FIG. A plurality of buoyant bodies 52 may be prepared and spread in layers in the attic space S. That is, at the time of construction of the buoyancy body 52, a preparation step (a) for preparing a plurality of block-like buoyancy bodies 52 and a filling step (b) for laminating and filling the plurality of buoyancy bodies 52 in the attic space S in layers. These steps may be executed in this order.

  FIG. 6 is a cross-sectional view showing the configuration of the building 56 with a changed roof. In the building 10 shown in FIG. 1, the roof 36 is formed in a triangular shape (isosceles triangle) having two inclined roof surfaces 42 and 44, but the shape of the roof is not particularly limited. It may be a triangular shape (right-angled triangle) having two roof surfaces, a flat shape without inclination (box-shaped roof), or a gently curved arc shape. Moreover, the shape which cut off some polygons like the roof 58 shown in FIG. 6 may be sufficient. In the roof 58 shown in FIG. 6, the roof surfaces 60 and 62 which are inclined while being bent on both sides sandwiching the vertex 58a are formed. Therefore, as in the case of the triangular roof shown in FIG. 2, it is easy to balance on both sides of the apex 58a, and the roof 58 is easily stabilized when the building 56 is poured into the water W. In addition, the disaster victim M easily climbs from the water surface X to the roof surfaces 60 and 62.

S ... Attic space, W ... Water, X ... Water surface, M ... Disaster victim, 10 ... Building, 12 ... Foundation, 14 ... Building body, 16 ... Buoyant body, 16a ... Resin foam, 20 ... Base, 22, 32 ... Pillars, 24, 34 ... beams, 36 ... roof, 38, 40 ... joints.

Claims (10)

A building body having a roof constituting an attic space;
A buoyancy body that is provided in the attic space and gives buoyancy to the building body when the building body is flushed with water;
The buoyancy body is a building composed of an amount of a resin foam capable of floating at least a part of the roof above the water surface.   The building according to claim 1, wherein the resin foam is a hard urethane foam. The building body has columns and beams coupled together in the attic space;
The building according to claim 1, wherein the resin foam is provided so as to be in close contact with and cover a joint portion between the pillar and the beam. The roof has an inclined roof surface;
The building according to any one of claims 1 to 3, wherein the buoyancy body is formed of a resin foam in an amount that does not allow the lower end of the roof surface to float above the water surface.   The building according to claim 4, wherein the roof is a triangular roof having two inclined roof surfaces.   The building according to any one of claims 1 to 5, wherein the buoyancy body is provided so as to fill the entire attic space. A buoyancy body construction method for providing a buoyancy body in a building body having a roof that constitutes an attic space,
(A) preparing a resin foam for constituting the buoyancy body;
(B) filling the attic space with an amount of the resin foam capable of causing at least a part of the roof to float above the water surface when the building body is flushed with water. Construction method. The step (a) has a step of mixing polyisocyanate, polyol and foaming agent,
The said (b) process has the process of producing | generating a rigid urethane foam, spraying the mixture mixed by the said (a) process inside the said attic space, Construction of the buoyancy body of Claim 7 Method. A building manufacturing method comprising a building body having a roof constituting an attic space, and a buoyancy body for imparting buoyancy to the building body,
(A) preparing a resin foam for constituting the buoyancy body;
(B) filling the attic space with an amount of the resin foam capable of causing at least a part of the roof to float above the water surface when the building body is flushed with water. Method. The step (a) has a step of mixing polyisocyanate, polyol and foaming agent,
The method for manufacturing a building according to claim 9, wherein the step (b) includes a step of generating a rigid urethane foam while spraying the mixture mixed in the step (a) on the inside of the attic space. .

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