A method for manufacturing a bathtub, a method for manufacturing a building equipped with a bathtub, a bathtub, and a building equipped with a bathtub.

Abstract

An object of the present invention is to provide a bathtub that is lighter than ever before. [Solution] The present invention solves the problem by providing a method for manufacturing a bathtub, including (Step 1) a step of forming a bathtub base containing foamed synthetic resin at the installation site, (Step 2) a step of applying an intermediate adhesive that mediates between mortar and synthetic resin to the surface of the bathtub base to form an intermediate adhesive layer, (Step 3) a step of directly or indirectly providing a finishing material attachment layer on the intermediate adhesive layer, and (Step 4) a step of covering the finishing material attachment layer with a finishing material. The present invention also discloses a bathtub made by the above manufacturing method and a building with a bathtub attached.

Description

[Technical field]

[0001] The present invention relates to a bathtub that is easy to install. [Background technology]

[0002] In recent years, saunas have become popular, and there are increasing requests from owners of existing condominiums and detached buildings to create bathrooms by installing bathtubs (cold baths) and saunas in their rooms. The existing building was not structurally designed to support a bathtub, which is a heavy object, so it was not possible to easily remodel an ordinary room into a bathroom. In this situation, a lightweight bathtub covered with FRP has been put to practical use, as described in Patent Document 1. However, it is difficult to bring a large bathtub into a room designed as a normal room without breaking down the door, and workers are required to build the bathtub on-site. However, making an FRP bathtub requires the layering of many layers of epoxy resin and fiberglass, and carrying out this work on-site is time-consuming. A method of hardening and molding FRP as prepreg is known (see Patent Document 2), but it requires pressurizing and heating the prepreg using a molding die to mold it, and the heating device that would contain the entire bathtub is larger than the bathtub, which makes it impossible to bring it to the site, making this construction method impossible. Furthermore, in a newly constructed building, in order to create a sauna bathroom in addition to a regular bathroom, it was necessary to reinforce the load-bearing strength of the floor on which the sauna would be installed, which resulted in high construction costs. If a bathtub made of FRP like that in Patent Document 1 were to be used, FRP has the disadvantage that its surface is easily scratched, and the resulting bathtub would lack a luxurious feel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication 2012-157403 [Patent Document 2] Patent Publication No. 5-285973 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a bathtub that is lighter than ever before. [Means for solving the problem]

[0005] In view of these problems, an aspect of the method for manufacturing a bathtub of the present invention has the following configuration. (Step 1) forming a bathtub base containing foamed synthetic resin at the installation site; (Step 2) A step of applying an intermediate adhesive that mediates between the mortar and the synthetic resin to the surface of the bathtub base to form an intermediate adhesive layer; (Step 3) On the intermediate adhesive layer Between providing a finish mounting layer in contact with the The step of indirectly providing the finishing material attachment layer in the step 3 is (Step 3-1) providing a waterproof mortar layer on the intermediate adhesive layer; (Step 3-2) A step of laying a waterproof sheet for cement on the waterproof mortar layer; (Step 3-3) A step of providing the finishing material mounting layer on the waterproof sheet for cement, (Step 4) Covering the finish material attachment layer with a finish material A method for manufacturing a bathtub comprising the steps of:

[0006] Furthermore, an aspect of the bathtub of the present invention has the following configuration. A bathtub base, an intermediate adhesive layer, a finish attachment layer, and a finish; The bathtub base contains a foamed synthetic resin, The bathtub base has a surface on which an intermediate adhesive layer is provided to intermediate between the mortar and the synthetic resin, The finish attachment layer is formed on the intermediate adhesive layer. Between It is provided in a contiguous manner. The structure in which the finishing material attachment layer is indirectly provided on the intermediate adhesive layer is as follows: A waterproof mortar layer is provided on the intermediate adhesive layer; A cement waterproof sheet is placed on the waterproof mortar layer. , The finishing material mounting layer is provided on the waterproof sheet for cement. A bathtub characterized in that the finishing material is provided on the finishing material mounting layer.

[0007] Furthermore, the present specification also discloses an aspect related to a building equipped with the bathtub of the above aspect. Effect of the Invention

[0008] The bathtub of the present invention is extremely lightweight. Even when adding a bathroom to an existing building, the present invention allows an existing room to be remodeled into a bathroom without or with minimal reinforcement of the floor. Furthermore, in a newly constructed building, the present invention eliminates the need to design the structure to accommodate a heavy bathtub, contributing to reducing building costs. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view of the bathroom of the first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the bathtub of the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view of the bathtub of the first modified example. [Figure 4] FIG. 4 is an explanatory diagram of (Step 1) in the production of the bathtub of Example 2. [Diagram 5] FIG. 5 is a cross-sectional view of the bathroom floor of the third embodiment. [Figure 6] FIG. 6 is a cross-sectional view including the wall of the bathroom of the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings indicate parts having the same function, and duplicated descriptions in each drawing will be omitted as appropriate.

[0011] Example 1 (Outline of the bathroom) Example 1 is an example in which one room in an existing building 1 (apartment) is remodeled into a bathroom 19 having a bathtub 2 (cold bath). A sauna is installed separately. In one room of the building 1 (apartment building) of the embodiment 1, the existing floorboards and ceiling boards are removed. In the room where bathroom 19 is planned to be located, floor slab 11, wall 5, and upper floor floor slab 11A will be exposed.

[0012] (Floor slab waterproof sheet) The walls 5 are covered with a floor slab waterproof sheet 12 up to at least the mid-height of the walls 5. As will be explained later, the floor 3 and bathtub 2 of the newly installed bathroom 19 are waterproofed and designed to prevent water from flowing into the floor slab 11. The floor slab waterproof sheet 12 serves to prevent water from flowing down to the floor below, even if some kind of trouble occurs and water flows into the floor slab 11. Therefore, the floor slab waterproof sheet 12 does not come into contact with water during normal use.

[0013] In addition, the floor slab waterproof sheet 12 waterproofs the wall 5 up to approximately the middle height, preventing splashes of water from seeping into the wall 5 when washing the body. In addition, the floor slab waterproof sheet 12 may be installed up to the top of the wall 5.

[0014] (Reinforced concrete foundation and anchoring blocks) The reinforced concrete foundation 14 is a reinforced concrete (RC) foundation that supports the wall 5. The fixing block 13 is provided so as to abut against the reinforced concrete foundation 14 that constitutes the lower end of the wall 5. The fixing block 13 abutting against the reinforced concrete foundation 14 also plays a role in determining the height of the wall 5 of the floor 3. The floor 3 does not abut against the wall 5 (reinforced concrete foundation 14), and a sealing recess 9 is provided between the end of the floor 3 and the wall 5 (reinforced concrete foundation 14). The sealing recess 9 is sealed with an irregular sealant after the floor 3 is constructed. The irregular sealant prevents water from flowing down to the floor slab 11 through a small gap where the wall 5 (reinforced concrete foundation 14) and the floor 3 abut.

[0015] In the case where an existing room is partitioned in the middle to create a bathroom 19, the fixing block 13 plays a role in determining the installation position of the newly installed wall 5.

[0016] (Floor support member) The floor support member 15 is placed on the floor slab waterproof sheet 12 laid on the floor slab 11 and supports the floor 3. The floor support member 15 is made of a high-strength material such as steel, and has an adjuster that can change the height of the support column of the floor support member 15. The heights of the multiple floor support members 15 are adjusted so that a water gradient is formed on the floor 3 toward the drainage hole 4, and the floor 3 is placed on top of them.

[0017] (floor) Details of the floor 3 will be described later, but a cement floor waterproof sheet 37 is provided in the middle layer of the floor 3 to enhance waterproofing. The surface of the floor 3 is covered with a floor finishing material 39 (not shown). Therefore, it is completely invisible from the outside that the floor 3 is made of a foamed synthetic resin layer 311 (not shown) as a base.

[0018] (drain hole) Drain hole 4 in Example 1 is provided at a position adjacent to bathtub 2, and water flowing due to the water gradient of floor 3 flows into it. Drain hole 4 is tightly sealed to prevent water from flowing into floor slab 11 from the connection between floor 3 and drain hole 4. A drain trap 41 is provided inside drain hole 4. Wastewater from which hair and other debris has been removed by drain trap 41 is discharged through drain pipe 42.

[0019] (Bathtub and fixing block) A fixing block 13 is installed under the bathtub 2 to determine the position of the bathtub 2. The fixing block 13 is installed on the floor slab waterproof sheet 12.

[0020] (Bathtub) The bathtub base 22 contains foamed synthetic resin such as expanded polystyrene. Foamed synthetic resin is extremely light because gas is sealed inside the synthetic resin as it foams. In addition, because the gas is sealed inside, it is a material with high thermal insulation properties. Therefore, the lightweight bathtub 2 makes it possible to remodel the existing building 1 into a bathroom 19 within the range of the design load. Furthermore, if the newly constructed building 1 has a bathroom 19 equipped with a lightweight bathtub 2, there is no need to perform structural design that takes into account the design load of the heavy bathtub 2, which allows for cost reduction.

[0021] A drain groove forming member 21 is disposed between the bottom of the bathtub 2 and the floor slab waterproof sheet 12. A plurality of drain groove forming members 21 are provided, and are arranged with gaps between them to form drain grooves 211. The drain groove forming members 21 allow the leaking water to escape from the drain groove 211 at the bottom of the bathtub 2 even if leakage occurs. The drain groove forming member 21 may be made of any material as long as it can support the bathtub 2 filled with water (hot water), but it is preferable that the material be lightweight. It is more preferable that the drain groove forming member 21 be made of the same expanded polystyrene as the bathtub 2.

[0022] (Finishing materials) The structure of the bathtub 2 will be described in detail later, but the part exposed inside the bathroom 19 is covered with a cement waterproof sheet 27. A finishing material mounting layer 28 (for bathtub), not shown, is provided on top of the cement waterproof sheet 27. The finishing material mounting layer 28 (for bathtub) is for covering the surface of the bathtub 2 with tiles 291 (for bathtub). The upper part of the bathtub 2 is attached to a finishing material mounting layer 28, not shown, in which a stone material 292 such as granite is attached. The entire part of the bathtub 2 that is visible from inside the bathroom 19 is covered with bathtub stones 292 or tiles 291. This allows the bathtub 2 of the first embodiment to have a luxurious appearance even though it is lightweight. The finishing material 29 is attached from a design point of view. Therefore, it is preferable to use a luxurious material such as natural stone or porcelain tile. From the viewpoint of weight reduction, a lightweight finishing material 29 such as resin may be selected. However, it is necessary to satisfy the fire resistance.

[0023] (Ceiling material) The ceiling is covered with a ceiling material 6. The ceiling material 6 is preferably made of a moisture-proof and waterproof material.

[0024] (Cross-sectional structure of bathtub) The bathtub 2 is constructed from a bathtub base 22 containing a very light and brittle foamed synthetic resin, and various improvements have been made to it. (Bathtub base) The bathtub base 22 is made of foamed synthetic resin such as foamed polystyrene, foamed polyurethane, etc. There may be various types of synthetic resin, but it is required that it is lightweight. In addition, the bathtub base 22 may have a core material or the like provided in the center of the foamed synthetic resin. The thickness of bathtub 2 is preferably 50mm to 300mm, and particularly preferably 200mm to 250mm. The depth of bathtub 2 is preferably 400mm to 1200mm. The lower limit of the depth of bathtub 2 is preferably a depth at which the body can be fully submerged in water, and particularly preferably 400mm to 800mm. The volume and depth of bathtub 2 affect the load, and the bottom area and thickness of bottom 2A of bathtub 2 affect the distribution of the load. The thickness and bottom area of ​​bottom 2A of bathtub 2 are determined taking into consideration the load allowable in the structural design of the room in which it is installed, etc.

[0025] (Intermediate adhesive layer) FIG. 2 is a cross-sectional view of the bathtub 2 of the first embodiment. The intermediate adhesive layer 24 used in the bathtub 2 mediates between the mortar (including resin cement) and the foamed synthetic resin, which is the material of the bathtub base 22. A silane coupling agent that mediates between the hydrophobic synthetic resin and the hydrophilic silanol group contained in the silica aggregate of the mortar, or a cationic intermediate adhesive consisting of a resin emulsion with a cationic (positive) charge that exerts an adsorption effect on negatively charged cement and aggregate particles, is selected. The intermediate adhesive layer 24 brings together the foamed synthetic resin and the cement and aggregate particles during the hardening process, providing a strong adhesive force. The cement-based cationic acrylic resin mortar, which is the main agent of the intermediate adhesive layer 24, is sold as Cation Tight (registered trademark of Yabu Hara Sangyo Co., Ltd.).

[0026] The type of intermediate adhesive layer 24 is selected depending on the properties of the finishing material mounting layer 28 that is to be layered on the intermediate adhesive layer 24. The finishing material mounting layer 28 may be made mainly of synthetic resin or mortar. However, finishing material mounting layers 28 made of synthetic resin generally have poor durability and fire resistance. Therefore, finishing material mounting layers 28 made mainly of mortar are preferred. In particular, the finishing material mounting layer 28, which is mainly made of mortar, is generally incompatible with the foamed synthetic resin of the bathtub base 22, and direct adhesion is difficult. Therefore, an intermediate adhesive layer 24 is used to mediate between the finishing material mounting layer 28, which is mainly made of mortar or the like as described above, and the foamed synthetic resin of the bathtub base 22. Due to the presence of the intermediate adhesive layer 24, the finish attachment layer 28 and the foamed synthetic resin of the bathtub base 22 are firmly and directly fixed together.

[0027] (Finishing material attachment layer and finishing material) The finishing material 29 is a tile 291, a stone material 292, or the like. As long as it is firmly fixed by the finishing material mounting layer 28, the finishing material 29 may be made of a synthetic resin. The finishing material 29 is a member having a strong design element. In order to enhance the sense of luxury, it is preferable that the finishing material 29 is made of porcelain tiles 291 or stone material 292 such as granite or marble. In addition, porcelain tiles 291 and stone materials 292 such as granite and marble are less susceptible to scratches and are more durable than synthetic resin tiles 291. The finish 29 may be selected for durability. Furthermore, the back surface of the finishing material 29 is preferably an uneven surface so that it can be firmly fixed to the finishing material mounting layer 28.

[0028] (Variation 1: Indirectly Installed Finishing Material Mounting Layer) In the above Example 1, the finish attachment layer 28 was applied directly onto the intermediate adhesive layer 24. In this modification, the finish attachment layer 28 is indirectly provided on the intermediate adhesive layer 24. This modification is used when it is desired to enhance the waterproofing of the bathtub 2. 3 is a cross-sectional view of a modified bathtub 2. In this modified example, a waterproof mortar layer 26 and a waterproof sheet for cement 27 are provided between an intermediate adhesive layer 24 and a finishing material mounting layer 28.

[0029] The intermediate adhesive layer 24 mediates between the waterproof mortar layer 26 and the bathtub base 22, which is based on foamed synthetic resin, and firmly bonds the two together. The cement waterproof sheet 27 is chemically treated so that it can be firmly bonded to cement, or is physically treated by implanting special fibers. Therefore, the cement waterproof sheet 27 is firmly fixed in place even though it is sandwiched between the waterproof mortar layer 26 and the finishing material mounting layer 28. This variant can improve the waterproofing of the bathtub 2.

[0030] Please refer to Figure 1. The cement waterproof sheet 27 in Figure 1 is provided on the outer surface, top, inner surface and bottom surface of the bathtub 2. The part of the bathtub 2 that can be seen from the bathroom 19 is all covered with the cement waterproof sheet 27. All parts of the bathtub 2 that come into contact with water are covered with a cement waterproof sheet 27 to enhance waterproofing.

[0031] Example 2 Example 2 is an embodiment focusing on the manufacturing method. It is often difficult to carry a completed bathtub 2 into an existing building 1. Because the bathtub 2 needs to be waterproof, it cannot be disassembled into multiple parts, and it is difficult to carry the bathtub 2 as it is through the door into the room. The bathtub 2 of the present invention has excellent on-site workability.

[0032] (Process 1) FIG. 4 is an explanatory diagram of (Step 1) in the production of bathtub 2 of Example 2. A worker carries in expanded polystyrene sheets, which are the material for the bathtub base 22, to the installation site. The expanded polystyrene sheets are stacked (assembled) to the height of the bathtub 2 to form a large block of expanded polystyrene. The expanded polystyrene sheets may or may not be glued together. If they are glued together, an adhesive suitable for the expanded polystyrene sheets is selected. The expanded polystyrene board that forms the bottom 2A of the bathtub 2 preferably has the same thickness as the thickness BH of the designed bottom 2A of the bathtub 2. When bonding with an adhesive, it is desirable to bond only the portion that will become the side wall 2B. It is preferable that at least the portion that will become the bottom 2A of the bathtub 2 is not bonded to the expanded polystyrene board above. This polystyrene foam block is cut from top to bottom along the side wall 2B indicated by the dashed line using a commercially available polystyrene foam cutting device equipped with a heater wire. When the cutting of the four side walls 2B is completed, the expanded polystyrene plate in the center of the bathtub 2 where water will accumulate is pulled out upward, leaving only the side walls 2B and the bottom 2A. As described above, the process of molding the bathtub base 22 made of foamed synthetic resin at the installation site (Step 1) is completed.

[0033] In another embodiment, the bathtub base 22 may be molded outside the room so that the side walls 2B and bottom 2A can be separated to the extent that they can pass through a door, and then assembled and molded at the installation site (Step 1).

[0034] Regardless of which form (Step 1) is adopted, transporting the lightweight expanded polystyrene to the site and molding it (Step 1) is extremely efficient.

[0035] (Process 2) (Step 2) is a step of forming an intermediate adhesive layer 24 by applying an intermediate adhesive that mediates between the cement and the synthetic resin (expanded polystyrene) to the surface of the bathtub base 22 assembled in (Step 1). The thickness of the intermediary adhesive layer 24 does not need to be thick since it only needs to act as an intermediary between the mortar applied in the next step.

[0036] (Step 3) (Step 3) is a step of providing a finish attachment layer 28 directly or indirectly on the intermediate adhesive layer 24. When the finishing material attachment layer 28 is provided on the intermediate adhesive layer 24, a predetermined thickness of waterproof mortar is applied on the intermediate adhesive layer 24. The thickness of the waterproof mortar layer 26 is selected to be suitable for providing the finishing material 29 on the waterproof mortar layer 26.

[0037] The following (Step 3-1) to (Step 3-3) are steps for improving the waterproofing of bathtub 2, and may or may not be performed. (Step 3-1) (Step 3-1) is a step of indirectly providing a finishing material mounting layer 28 after (Step 3). In (Step 3-1), a waterproof mortar layer 26 is provided on the intermediate adhesive layer 24. Furthermore, the waterproof mortar layer 26 is a layer provided to fix a waterproof sheet for cement 27 in the next step.

[0038] (Step 3-2) (Step 3-2) is a step of laying a waterproof sheet for cement 27 on the waterproof mortar layer 26. As described above, the waterproof sheet for cement 27 has been chemically treated so as to be firmly bonded to the cement, or physically treated by having special fibers implanted therein. Therefore, the waterproof sheet for cement 27 is firmly fixed to the waterproof mortar layer 26.

[0039] (Step 3-3) (Step 3-3) is a step of providing a finishing material mounting layer 28 on the cement waterproof sheet 27. The finishing material mounting layer 28 serves as a base for providing the finishing material 29, and is provided with a thickness that allows the finishing material 29 to be firmly fixed. The material of the finishing material mounting layer 28 is preferably mortar. However, if it has high fire resistance and durability, it may be synthetic resin. Since synthetic resin has the drawback of thermally expanding and contracting at the temperature of water, a synthetic resin that does not expand or contract in response to heat is selected to enhance durability. When a synthetic resin-based finishing material mounting layer 28 is used, an intermediate adhesive layer 24 may be further provided on the cement waterproof sheet 27.

[0040] (Step 4) (Step 4) is a step of covering the finishing material mounting layer 28 with finishing material 29. In the bathtub 2 of Example 2, the inner surface, outer surface, and bottom surface of the bathtub 2 are covered with tiles 291, which are the finishing material 29. The upper surface of the bathtub 2 is covered with stone material 292 such as granite to give a luxurious feel. In the bathtub 2 of Example 2, tiles 291 are embedded in the finish material mounting layer 28 so that the finish material mounting layer 28 is visible between adjacent tiles 291.

[0041] (Modification of large volume bathtub) Depending on the structural design, it may be possible to install a bathtub 2 with a large volume. The bathtub base 22 is primarily made of foamed synthetic resin, and if it is to be made large-volume, it may deform when filled with hot or cold water. In such cases, a "hoop" made of stainless steel or steel is fitted around the outer surface that constitutes the bathtub 2. A "hoop" is known as a component that is attached around a tub or barrel and tightens it from the outside. By attaching the "hoop" to an appropriate layer on the outer surface of the bathtub base 22, the completed bathtub 2 will not deform. As a modified example, an embodiment that utilizes a "hoop" is disclosed, so that when a bathtub designer selects a type of foamed synthetic resin, he or she does not need to consider the strength of the foamed synthetic resin, such as its deformability, thereby expanding the range of choices.

[0042] (Bathtub volume and shape) The bathtub 2 of Example 2 can be constructed on-site, so it is possible to create a bathtub 2 with the volume and shape desired by the customer as long as it is within the range of the load in the structural design of the floor 3. The bathtub 2 can be designed in any shape desired, such as a round bathtub 2 or a polygonal bathtub 2. In addition, even though the bathtub 2 has a small volume, the bathtub base 22 contains foamed synthetic resin, so that the bathtub has high thermal insulation properties and it is possible to suppress the change in water temperature per unit time.

[0043] [Example 3] Example 3 is an embodiment of a floor 3. Fig. 5 is a cross-sectional view of the floor 3 of the bathroom 19 of Example 3. The floor 3 needs to be rigid so that it does not sag when people walk on it, and it is preferable that it is thin and light. It is assumed that the bathroom will be used in a manner that places a large load on a specific area, such as when a user uses a stepladder to clean the bathroom. If the floor 3 flexes, problems such as cracks appearing in the floor finishing material mounting layer 38 or the floor waterproof mortar layer 36, or the floor finishing material 39 peeling off may occur. The floor 3 of the third embodiment is designed so as not to sag even when a load is applied to one point.

[0044] The base of the floor 3 includes a foamed synthetic resin layer 311, and is 30 mm to 100 mm thick. The foamed synthetic resin is made of foamed polystyrene, foamed polyurethane, etc. There can be various types of foamed synthetic resin, but it is required to be lightweight. The base of the floor 3 may be made of foamed synthetic resin with a core material or the like provided at the center.

[0045] The foamed synthetic resin layer 311 is sandwiched between an upper plate material 312 and a lower plate material 313 from above and below to form a sandwich panel 31 (floor base) including the foamed synthetic resin layer 311. The sandwich panel 31 (floor base) may be a commercially available product. Alternatively, the sandwich panel 31 may be prepared by an operator. The upper plate material 312 and the lower plate material 313 are preferably made of a cement-based plate material.

[0046] In addition, the floor 3 can be made of an upper board material 312 or a lower board material 313 if the floor intermediary adhesive layer 34 on which the fiber layer 35 is arranged can provide sufficient strength.

[0047] A floor intermediary adhesive layer 34 is laminated on the sandwich panel 31 (floor base). The adhesive used in the floor intermediary adhesive layer 34 is compatible with the fiber layer 35 such as glass fiber, and also with the upper plate material 312 and the floor waterproof mortar layer 36 located above and below the floor intermediary adhesive layer 34. The type of adhesive used in the floor intermediary adhesive layer 34 is selected depending on the materials of the fiber layer 35, the floor waterproof mortar layer 36, and the upper plate material 312. A silane coupling agent that mediates between a hydrophobic synthetic resin and a hydrophilic silanol group contained in the silica aggregate of the mortar, or a cationic intermediary adhesive made of a cationic (positively) charged resin emulsion that has an adsorption effect on negatively charged cement and aggregate particles, etc. are selected. The fiber layer 35 is preferably formed by stacking multiple layers of woven fabric or unidirectional fiber sheets in alternating directions. By stacking the fiber layers 35 in various directions, unevenness in strength in each direction is eliminated, and uniform strength can be achieved.

[0048] The floor intermediary adhesive layer 34 and the fiber layer 35 embedded therein provide rigidity to the floor 3, and their thickness is determined according to the required strength.

[0049] A floor waterproof mortar layer 36 is laminated on the floor intermediary adhesive layer 34. Then, a cement floor waterproof sheet 37 is laminated on the floor waterproof mortar layer 36. The materials of the floor waterproof mortar layer 36 and the cement floor waterproof sheet 37 are the same as those of the bathtub 2.

[0050] The floor finishing material mounting layer 38 is for embedding the floor finishing material 39 and is laminated on top of the floor waterproof mortar layer 36.

[0051] The floor finishing material 39 may be tiles 291, stones 292, or the like, and may be designed to be integrated with the bathtub 2. In addition, by using tiles 291, stones 292, or the like larger than those used in the bathtub 2 for the floor finishing material 39, the rigidity of the floor 3 can be increased. The floor finishing material 39 having a large surface area per sheet can contribute to the distribution of load.

[0052] (Floor construction) When installing a bathroom 19 in one room of an existing building 1, the floor 3 is constructed on-site. The rooms that will become the bathroom 19 desired by the customer vary in size, shape, and entrance location, requiring on-site construction. In the case of a newly constructed building 1, the bathroom 19 may be a unitized unit, such as a modular bathroom. Of course, if an existing building 1 is compatible, a modularized bathroom 19 can be installed.

[0053] (Summary of aspects of Example 3) Example 3 discloses a building 1 having a floor 3 comprising a floor base 31, a floor intermediary adhesive layer 34, a floor finishing material attachment layer 38, and a floor finishing material 39, wherein the floor base 31 is a member containing a foamed synthetic resin, the floor intermediary adhesive layer 34 includes a fiber layer 35, the floor finishing material attachment layer 38 is provided directly or indirectly on the floor intermediary adhesive layer 34, and the floor finishing material 39 is provided on the floor finishing material attachment layer 38.

[0054] A structure in which the floor finishing material attachment layer 38 is indirectly provided on the floor intermediate adhesive layer 34 results in a building 1 equipped with a bathtub 2 in which a floor waterproof mortar layer 36 is provided on the floor intermediate adhesive layer 34, a cement floor waterproof sheet 37 is provided on the floor waterproof mortar layer, and a floor finishing material attachment layer 38 is provided on the cement floor waterproof sheet 37.

[0055] [Example 4] Example 4 is an embodiment of a wall 5 of a bathroom 19. The wall base 51 of an existing building or a new building may be made of any material. (wall) FIG. 6 is a cross-sectional view including the wall 5 of the bathroom 19 of the fourth embodiment. Unnecessary materials such as wallpaper are peeled off from the wall base 51, and a wall waterproof and moisture-proof sheet 53 is attached. As described above, the floor slab waterproof sheet 12 is attached at least to the middle height of the wall 5. The wall 5 of the fourth embodiment has the floor slab waterproof sheet 12 attached to the underside of the floor slab 11 of the upper floor. Next, the wall 5 is provided with a wall waterproof mortar layer 52 on the floor slab waterproof sheet 12. The wall waterproof and moisture-proof sheet 53 is installed together with the wall waterproof mortar layer 52. It is preferable that the wall waterproof and moisture-proof sheet 53 and the wall waterproof mortar layer 52 are provided from the floor slab 11 supporting the bathtub 2 and floor 3 to the underside of the floor slab 11 of the upper floor. The wall 5 is provided with a wall finishing material mounting layer 54 in a portion visible from the bathroom 19, and a wall finishing material 59 is attached. That is, the range in which the wall finishing material 59 can be attached is from the floor 3 to the ceiling material 6. Wall 5 does not need to be designed to be walked on by bathroom users, and does not need to be as strong or rigid as floor 3. Therefore, wall 5 is designed with waterproofing and moisture resistance as the main considerations.

[0056] (ceiling) The ceiling material 6 is selected for a bathtub and attached to the ceiling.

[0057] [Example 5] Example 5 is an example of renovating a wooden building 1 to provide a bathroom 19. Basically, it is the same as Examples 1 to 4, except that the floor slab 11 and the like are changed to wooden materials.

[0058] The materials of the bathtub 2, floor 3, and wall 5 are preferably made with fire resistance in mind.

[0059] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes design changes and the like that do not deviate from the gist of the present invention. Furthermore, the above-described embodiments can be combined by utilizing the technologies of each other, so long as there are no particular contradictions or problems in the purpose, configuration, and the like. [Explanation of symbols]

[0060] 1. Building 11 Floor slab 12 Floor slab waterproof sheet 13 Fixing block 14 Reinforced concrete foundation 19 Bathroom 2 Bathtub 21 Drainage ditch forming members 22 Bathtub base (foamed synthetic resin layer) 24 Intermediate adhesive layer 26 Waterproof mortar layer 27 Cement waterproof sheet 28 Finishing material attachment layer 29 Finishing Materials 291 tiles 292 Stone 3 Beds 31 Sandwich panel (floor base) 311 Foamed synthetic resin layer 312 Upper plate material 313 Lower plate 34 Floor-interface adhesive layer 35 Fiber layer 36 Floor waterproof mortar layer 37 Cement floor waterproof sheet 38 Floor finishing material attachment layer 39 Floor finishing materials 4 Drain hole 41 Drain Trap 42 Drain pipe 5. Wall 51 Wall base 52 Wall waterproof mortar layer 53 Wall waterproof and moisture-proof sheet 54 Wall finishing material attachment layer 59 Wall Finishing Materials 6 Ceiling materials

Claims

1. (Step 1) forming a bathtub base comprising a foamed synthetic resin at the installation site; (Step 2) A step of applying an intermediate adhesive between the mortar and the synthetic resin to the surface of the bathtub base to form an intermediate adhesive layer; (Step 3) providing a finish attachment layer indirectly on the intermediate adhesive layer; The step of indirectly providing the finishing material attachment layer (step 3) is (Step 3-1) A step of providing a waterproof mortar layer on the intermediate adhesive layer; (Step 3-2) A step of laying a waterproof sheet for cement on the waterproof mortar layer; (Step 3-3) A step of providing the finishing material mounting layer on the waterproof sheet for cement, (Step 4) Covering the finish mounting layer with a finish A method for manufacturing a bathtub comprising the steps of:

2. The foamed synthetic resin is expanded polystyrene, 2. The method for manufacturing a bathtub according to claim 1, wherein the intermediate adhesive is a cement-based cationic resin mortar.

3. (Step 1) forming a bathtub base comprising a foamed synthetic resin at the installation site; (Step 2) A step of applying an intermediate adhesive between the mortar and the synthetic resin to the surface of the bathtub base to form an intermediate adhesive layer; (Step 3) providing a finish attachment layer indirectly on the intermediate adhesive layer; The step of indirectly providing the finishing material attachment layer (step 3) is (Step 3-1) A step of providing a waterproof mortar layer on the intermediate adhesive layer; (Step 3-2) A step of laying a waterproof sheet for cement on the waterproof mortar layer; (Step 3-3) A step of providing the finishing material mounting layer on the waterproof sheet for cement. (Step 4) Covering the finish mounting layer with a finish A method for manufacturing a building equipped with a bathtub, comprising:

4. The foamed synthetic resin is expanded polystyrene, The method for manufacturing a building according to claim 3, wherein the intermediate adhesive is a cement-based cationic resin mortar.

5. A bathtub base, an intermediate adhesive layer, a finish attachment layer, and a finish; The bathtub base contains a foamed synthetic resin, The bathtub base has a surface on which an intermediate adhesive layer is provided to intermediate between the mortar and the synthetic resin, the finish attachment layer is indirectly disposed on the intermediate adhesive layer; The structure in which the finishing material attachment layer is indirectly provided on the intermediate adhesive layer is as follows: A waterproof mortar layer is provided on the intermediate adhesive layer; A waterproof sheet for cement is provided on the waterproof mortar layer, The finishing material mounting layer is provided on the waterproof sheet for cement. A bathtub characterized in that the finishing material is provided on the finishing material mounting layer.

6. The foamed synthetic resin is expanded polystyrene, 6. The bathtub of claim 5, wherein the intermediate adhesive layer is a cement-based cationic resin mortar.

7. A bathtub base, an intermediate adhesive layer, a finish attachment layer, and a finish; The bathtub base contains a foamed synthetic resin, The bathtub base has a surface on which an intermediate adhesive layer is provided to intermediate between the mortar and the synthetic resin, the finish attachment layer is indirectly disposed on the intermediate adhesive layer; The structure in which the finish attachment layer is indirectly provided on the intermediate adhesive layer is as follows: A waterproof mortar layer is provided on the intermediate adhesive layer; A cement waterproof sheet is provided on the waterproof mortar layer, The finishing material mounting layer is provided on the waterproof sheet for cement, A building equipped with a bathtub, wherein the finishing material is provided on the finishing material mounting layer.

8. The foamed synthetic resin is expanded polystyrene, 8. The building of claim 7, wherein said intermediate adhesive layer is a cement-based cationic resin mortar.

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