JP7850103B2 - Components for around drains, bathroom floor structure, and bathroom floor construction method - Google Patents

Description

This invention relates to a drainage outlet surround component, a bathroom floor structure using the drainage outlet surround component, and a method for constructing a bathroom floor.

In recent years, renovations have become increasingly common in buildings such as detached houses, condominiums, dormitories, hotels, inns, hot spring facilities, elderly care facilities, nursing care facilities, and hospitals, creating a demand for simple bathroom renovations. One proposed method for simple bathroom renovation involves laying a resin-based bathroom floor sheet (referred to as a "surface floor sheet" in this disclosure) on the surface of the bathroom floor. For example, if the bathroom floor is covered with ceramic tiles, the surface floor sheet can be laid on top of the ceramic tiles using adhesive, thereby renovating the bathroom floor surface. This method allows for easy and low-cost bathroom floor renovations.

In this case, a drain is formed in the bathroom floor, and the surface floor sheet laid on the surface of the bathroom floor is laid on the portion of the bathroom floor surface excluding the drain, so as not to cover and block the drain. Patent Document 1 discloses a technique for installing a trim around the drain. In Patent Document 1, a trim is installed around the drain, and a sealant is filled between the surface floor sheet and the trim, preventing the portion of the surface floor sheet facing the drain from being exposed. This prevents the surface floor sheet from peeling off from the portion facing the drain.

Patent No. 5984190

The surface floor sheet has cushioning and heat-insulating properties. The cushioning of the surface floor sheet allows for some impact absorption in case a user slips and falls, hitting their head or body on the bathroom floor. Furthermore, the heat-insulating properties of the surface floor sheet reduce the risk of heat shock caused by the coldness of the bathroom floor in winter.

While surface floor sheets can provide a certain degree of shock absorption, cushioning, and heat insulation to bathroom floors, there is a demand for further improvements in these properties. Therefore, it is common practice to lay subfloor materials such as shock absorbers, cushioning materials, and heat insulation materials along with the surface floor sheet on the bathroom floor surface. However, when subfloor materials such as shock absorbers, cushioning materials, and heat insulation materials are placed beneath the surface floor sheet, the trim material described in Patent Document 1 does not take the subfloor material into consideration. Therefore, even if the trim material is installed around the drain, when the subfloor material sinks due to the weight of feet or chairs, the watertightness between the trim material and the surface floor sheet is compromised, potentially allowing water to seep beneath the surface floor sheet.

This invention was made to solve the above problems and aims to provide a drainage surround member installed between a surface floor sheet and subfloor material laid on the surface of a bathroom floor and a drainage opening formed in the bathroom floor, a bathroom floor structure equipped with this drainage surround member, and a method for constructing a bathroom floor using this drainage surround member to install the surface floor sheet and subfloor material on the surface of the bathroom floor.

To solve the above problems, the present invention encompasses the drainage outlet surround member described in Section 1 below.

Item 1. A drainage member installed between the subfloor material and surface floor sheet laid on the surface of the bathroom floor and the drainage opening formed in the bathroom floor, wherein the outer surface is adjacent to the surface floor sheet and the subfloor material,
The aforementioned outer surface is,
The lower first wall surface facing the aforementioned floor subfloor material,
A second wall surface located on the drain side of the first wall surface and facing the surface floor sheet,
A sheet support surface that connects the first wall surface and the second wall surface and on which the portion of the surface floor sheet facing the second wall surface can be placed,
Components for use around drain openings, including those mentioned above.

The drain outlet surround member of the present invention, as a preferred embodiment of the drain outlet surround member described in item 1 above, includes the drain outlet surround member described in item 2 below.

Item 2. The drain outlet surround member according to Item 1, wherein the upper surface connected to the upper edge of the second wall surface includes an inclined surface that slopes downward toward the drain outlet side.

Furthermore, the drainage outlet surround member of the present invention includes, as a preferred embodiment of the drainage outlet surround member described in item 2 above, the drainage outlet surround member described in item 3 below.

Item 3. The drain outlet surround member according to Item 2, wherein the upper surface further includes a flat surface extending horizontally from the upper edge of the second wall surface toward the drain outlet side.

Furthermore, the drainage outlet surround member of the present invention includes, as a preferred embodiment of the drainage outlet surround member described in items 2 to 3 above, the drainage outlet surround member described in item 4 below.

Item 4. The inner surface on the drain side, located opposite the outer surface, hangs down from the edge of the inner surface on the upper surface, as described in Item 2 or 3, for use around a drain outlet.

Furthermore, the drainage outlet surround member of the present invention includes, as a preferred embodiment of the drainage outlet surround member described in item 1 above, the drainage outlet surround member described in item 5 below.

Item 5. The inner surface on the drain side, located opposite the outer surface,
The upper surface connected to the upper edge of the second wall surface, and the upper third wall surface that hangs down from the edge on the inner side,
A fourth wall surface located closer to the drain outlet than the third wall surface,
The drain outlet surround member according to claim 1, comprising a drain cover support surface that connects the third wall surface and the fourth wall surface and on which a portion of a drain cover provided above the drain outlet can be placed.

Furthermore, the drainage outlet surround member of the present invention includes, as a preferred embodiment of the drainage outlet surround member described in item 5 above, the drainage outlet surround member described in item 6 below.

Item 6. A frame-shaped component for surrounding the drain opening, as described in Item 5.

Furthermore, the drainage outlet surround member of the present invention includes, as a preferred embodiment of the drainage outlet surround member described in items 1 to 6 above, the drainage outlet surround member described in item 7 below.

Item 7. A drainage outlet surround member according to any one of items 1 to 6, comprising a plate-like portion that protrudes outward from the lower edge of the first wall surface and on which a portion of the floor base material can be placed.

To solve the above problems, the present invention encompasses the bathroom floor structure described in Section 8 below.

Item 8. A drain surround member as described in any one of items 1 to 7, which is installed around the drain on the surface of the bathroom floor,
A subfloor material laid on the surface of the bathroom floor, wherein the portion facing the first wall surface is the subfloor material facing the first wall surface,
A surface floor sheet laid on the aforementioned subfloor material, wherein the portion of the surface floor sheet facing the second wall surface has a gap between it and the second wall surface,
A first sealing agent is filled into the gap,
A bathroom floor structure that includes the following features.

The bathroom floor structure of the present invention, as a preferred embodiment of the bathroom floor structure described in item 8 above, includes the bathroom floor structure described in item 9 below.

Item 9. The bathroom floor structure according to Item 8, further comprising a second sealing agent provided between the inner surface on the drain side, located opposite the outer surface of the drain surrounding member, and the drain itself.

The bathroom floor structure of the present invention, as a preferred embodiment of the bathroom floor structures described in items 8 to 9 above, includes the bathroom floor structure described in item 10 below.

Item 10. The bathroom floor structure according to claim 8 or 9, wherein the upper surface of the drainage outlet surround member connected to the upper end of the second wall surface and the upper surface of the surface floor sheet are flush with each other via the upper surface of the first sealant.

The bathroom floor structure of the present invention, as a preferred embodiment of the bathroom floor structures described in items 8 to 10 above, includes the bathroom floor structure described in item 11 below.

Item 11. The bathroom floor structure according to any one of items 8 to 10, wherein the portion of the surface floor sheet facing the first wall surface is fixed to the sheet support surface.

The bathroom floor structure of the present invention, as a preferred embodiment of the bathroom floor structures described in items 8 to 11 above, includes the bathroom floor structure described in item 12 below.

Item 12. The drainage outlet surround member is installed around the drainage outlet by connecting multiple members.
The bathroom floor structure according to any one of claims 8 to 11, wherein in two adjacent members of a plurality of members, the joints in the sheet support surface and the first wall surface are covered with waterproof tape.

To solve the above problems, the present invention encompasses the method for constructing bathroom floors described in Section 13 below.

Item 13. The step of installing the drainage member described in any one of items 1 to 7 around the drain on the surface of the bathroom floor,
The process of laying a subfloor material on the surface of the bathroom floor such that the portion facing the first wall surface is opposite to the first wall surface,
The steps include laying a surface floor sheet on the floor base material such that the portion facing the second wall surface has a gap with the first wall surface,
The process of filling the gap with a sealant,
A method for constructing bathroom floors, which includes [the specified feature].

According to the present invention, the drainage outlet surround member, installed between the surface floor sheet and subfloor material laid on the surface of the bathroom floor and the drainage outlet formed in the bathroom floor, comprises, on its outer surface adjacent to the surface floor sheet and subfloor material, a lower first wall surface facing the subfloor material, an upper second wall surface facing the surface floor sheet, and a sheet support surface on which the portion of the surface floor sheet facing the second wall surface is placed.

In this invention, the outer surface of the drainage outlet surround member is a stepped surface having a sheet support surface between a first wall surface that is lower and outer and faces the subfloor material, and a second wall surface that is upper and inner and faces the surface floor sheet. The portion of the surface floor sheet facing the second wall surface can be placed on this sheet support surface. This allows the surface floor sheet to be fixed to the sheet support surface using fixing means such as adhesive, adhesive, double-sided tape, or suction foam. Therefore, even if the subfloor material is significantly indented when a user steps on the surface floor sheet near the drainage outlet surround member, the fixation between the surface floor sheet and the drainage outlet surround member can be maintained, and the watertight treatment between the surface floor sheet and the drainage outlet surround member can be maintained. Thus, water penetration between the surface floor sheet and the drainage outlet surround member can be suppressed.

Figure 1 is a plan view showing an enlarged portion of the bathroom floor structure of the first embodiment. Figure 2 is a cross-sectional view taken along line I-I in Figure 1. Figure 3 is a plan view of an example of a bathroom to which the bathroom floor structure of the first embodiment is applied. Figure 4 is a perspective view showing a drain opening formed in a bathroom to which the bathroom floor structure of the first embodiment is applied. Figure 5(A) is a magnified view of a portion of the surface floor sheet, Figure 5(B) is a magnified view of a portion of the subfloor material, and Figure 5(C) is a magnified view of a portion of the surface floor sheet laid on the subfloor material. Figure 6 is a perspective view of the drain outlet surround component of the first embodiment. Figure 7 is a bottom view of the drain outlet surround component of the first embodiment. Figure 8 is an end view of the drain outlet surround member of the first embodiment. Figure 9 is a plan view of the drain outlet surround component of the first embodiment. Figure 10 is an exploded perspective view of the drain outlet surround component of the first embodiment. Figure 11(A) is a perspective view of a linear member constituting a drain outlet surround member of the first embodiment, Figure 11(B) is a plan view of the linear member, and Figure 11(C) is a side view of the linear member. Figure 12(A) is a perspective view of a corner member constituting a drain outlet surround member of the first embodiment, Figure 12(B) is a plan view of the corner member, and Figure 12(C) is a side view of the corner member. Figures 13(A) to (C) are plan views showing modified examples of the components constituting the drainage outlet surround component of the first embodiment. Figure 14 is a perspective view showing the procedure for constructing the bathroom floor structure of the first embodiment. Figures 15(A) and (B) show the state in which one end of the drain surround member of the first embodiment is fixed to the bathroom wall. Figures 16(A) and (B) show the state in which the joints between the members constituting the drainage outlet surround member of the first embodiment have been sealed with waterproof tape. Figure 17 is a perspective view showing the procedure for constructing the bathroom floor structure of the first embodiment. Figure 18 is a perspective view showing the procedure for constructing the bathroom floor structure of the first embodiment. Figure 19 is a perspective view showing the procedure for constructing the bathroom floor structure of the first embodiment. Figure 20 is a perspective view showing the procedure for constructing the bathroom floor structure of the first embodiment. Figures 21(A) to (E) are end views showing modified examples of the drain outlet surround member of the first embodiment. Figure 22 is a plan view showing a modified example of the drain outlet surround component of the first embodiment. Figure 23 is a cross-sectional view showing a modified example of the bathroom floor structure of the first embodiment. Figure 24 is a plan view showing an enlarged portion of the bathroom floor structure of the second embodiment. Figure 25 is a cross-sectional view taken along line II-II of Figure 24. Figure 26 is a perspective view showing a drain formed in the bathroom floor of the second embodiment. Figure 27(A) is a magnified view of a portion of the surface floor sheet, Figure 27(B) is a magnified view of a portion of the subfloor material, and Figure 27(C) is a magnified view of a portion of the surface floor sheet laid on the subfloor material. Figure 28 is a perspective view of the drain outlet surround component of the second embodiment. Figure 29 is a bottom view of the drain outlet surround component of the second embodiment. Figure 30 is a plan view of the drain outlet surround component of the second embodiment. Figure 31 is a cross-sectional view taken along line III-III of Figure 30. Figure 32 is a perspective view showing the procedure for constructing the bathroom floor structure of the second embodiment. Figure 33 is a perspective view showing the procedure for constructing the bathroom floor structure of the second embodiment. Figure 34 is a perspective view showing the procedure for constructing the bathroom floor structure of the second embodiment. Figure 35 is a perspective view showing the procedure for constructing the bathroom floor structure of the second embodiment. Figure 36 is a perspective view showing the procedure for constructing the bathroom floor structure of the second embodiment. Figure 37 is a perspective view showing the procedure for constructing the bathroom floor structure of the second embodiment. Figure 38 is a plan view showing a modified example of the drain outlet surround component of the second embodiment. Figure 39 is a cross-sectional view showing a modified example of the bathroom floor structure of the second embodiment.

This invention can be suitably used, for example, in bathroom renovations, when remodeling the surface of a bathroom floor by laying a new surface floor sheet and subfloor material on the bathroom floor surface.

Examples of bathroom floors to which the present invention applies include bathroom floors finished with flooring materials such as ceramic tiles, wood, or stone, and bathroom floors formed from panel materials such as resin or FRP. The surface floor sheet and subfloor material are laid on top of the existing flooring or paneling material of the bathroom floor. If an interior sheet is laid on top of the existing flooring or paneling material of the bathroom floor, the existing interior sheet may be removed before laying the surface floor sheet and subfloor material, or the surface floor sheet and subfloor material may be laid without removing the existing interior sheet.

Bathrooms can be categorized into several types, including those built using conventional construction methods, single-unit bathrooms consisting only of a bathtub (and shower area), bathrooms with a bathtub, shower room, and sink, two-unit bathrooms with a bathtub and sink integrated into one unit, bathrooms with a bathtub, shower room, sink, and toilet, and three-unit bathrooms with a bathtub, sink, and toilet integrated into one unit.

The embodiments of the present invention will be described below with reference to the accompanying drawings. Please note that the dimensions (length, width, height, and thickness) of each component or part in the drawings may differ from those of the actual components.

Figures 1 and 2 show the bathroom floor structure of the first embodiment . Figures 3 and 4 show an example of a bathroom to which the bathroom floor structure of the first embodiment is applied. The bathroom shown in Figures 3 and 4 includes a bathtub 200 and a washing area 201 adjacent to the bathtub 200. The bathroom floor structure of the first embodiment is a floor structure in which a surface floor sheet 10 and a floor underlayment 11 are laid on the surface F of the bathroom floor (the floor of the washing area 201) where a drain opening D is formed along the bathroom wall W (or bathtub, drain). The floor underlayment 11 is laid on the surface F of the bathroom floor using fixing means such as adhesive, adhesive, double-sided tape, or suction foam, and the surface floor sheet 10 is laid on top of the floor underlayment 11 using fixing means such as adhesive, adhesive, double-sided tape, or suction foam. The surface floor sheet 10 constitutes the surface of the bathroom floor after renovation. In this disclosure, the term "drain opening" refers to a hole into which wastewater flows, but the shape of this hole is not particularly limited and includes drainage channels formed in a groove shape.

Figure 5(A) shows the opening edge 100 and opening O1 of the surface floor sheet 10 in a plan view, and Figure 5(B) shows the opening edge 110 and opening O2 of the floor underlayment material 11 in a plan view. Figure 5(C) shows the opening edges 100, 110 and openings O1, O2 in a state where the surface floor sheet 10 is laid on the floor underlayment material 11. The surface floor sheet 10 and the floor underlayment material 11 have openings O1 and O2 that are slightly larger than the drain opening D, as shown in Figures 5(A) and (B), so as not to cover and block the drain opening D. In the first embodiment, openings O1 and O2 are formed in a part of the outer peripheral edge of the surface floor sheet 10 and the floor underlayment material 11. These openings O1 and O2 have a shape that matches the plan view shape of the drain opening surround member 2, which will be described later, and in this embodiment, they are rectangular in plan view, the same as the drain opening D. As shown in Figure 5(C), the opening O2 formed in the floor underlayment 11 is slightly larger than the opening O1 formed in the surface floor sheet 10. The difference in size between openings O1 and O2 in the longitudinal direction (left-right direction in Figure 5) is not particularly limited, but it is preferably between 5 mm and 20 mm.

As shown in Figures 1 and 2, the surface floor sheet 10 and the underlayment 11 are laid on the surface F of the bathroom floor, excluding the drain opening D. The opening edges 100 and 110 of the surface floor sheet 10 and underlayment 11, located around the drain opening D, have a gap between them and the drain opening D. The drain opening surround member 2 is installed in this gap. The drain opening surround member 2 is installed around the drain opening D. The drain opening surround member 2 is installed on the surface F of the bathroom floor using fixing means such as adhesive, adhesive, double-sided tape, or suction foam.

In this disclosure, the fixing means for fixing the subfloor material 11 to the surface F of the bathroom floor, the fixing means for fixing the surface floor sheet 10 to the subfloor material 11, and the fixing means for fixing the drainage area member 2 to the surface F of the bathroom floor are not particularly limited. However, adhesives and double-sided tape can be suitably used because they have high water-sealing properties, can prevent the intrusion of bath products, and can suppress the growth of mold. The adhesive is not particularly limited, but for example, epoxy adhesives, urethane adhesives, acrylic resin adhesives, polyvinyl acetate adhesives, urea resin adhesives, silicone adhesives, modified silicone adhesives, and rubber adhesives can be used. Among these, epoxy adhesives can be suitably used because they have excellent water resistance and adhesion. The adhesive may also contain an antifungal agent. The antifungal agent is not particularly limited as long as it can prevent the growth of mold, but for example, benzimidazole-based antifungal agents, dodecylguanidine hydrochloride, N-(fluorodichloromethylthio)-phthalimide, N-lauryl-β-alanine, etc. can be used. Among these, benzimidazole-based antifungal agents can be preferably used due to their superior antifungal effect. The double-sided tape is not particularly limited, but for example, Toli Corporation's "Basna Tape" can be preferably used.

The drain surround member 2 is installed so that its outer surface 4 is adjacent to the surface floor sheet 10 and the subfloor material 11. In other words, the outer surface 4 of the drain surround member 2 faces the opening edges 100 and 110 located around the drain D in the surface floor sheet 10 and the subfloor material 11. Note that in the drain surround member 2, the side facing the drain D is considered the inside, and the opposite side facing the surface floor sheet 10 and subfloor material 11 is considered the outside.

The subfloor material 11 is laid on the surface F of the bathroom floor so that its opening edge 110 faces the outer surface 4 of the drain surround member 2. Here, "facing" includes cases where the opening edge 110 of the subfloor material 11 abuts against the outer surface 4 of the drain surround member 2 without any gap between them, and cases where there is a gap between them. The surface floor sheet 10 is laid on top of the subfloor material 11 so that its opening edge 100 has a gap between it and the outer surface 4 of the drain surround member 2. The gap between the opening edge 100 of the surface floor sheet 10 and the outer surface 4 of the drain surround member 2 is filled with the first sealant 12.

The drain surround component 2 has an inner surface 6 opposite the outer surface 4 located near the drain opening D, with a gap between the inner surface 6 and the drain opening D. This gap is filled with the second sealant 13.

Next, the various components used in the bathroom floor structure 1 of the first embodiment will be described.

As shown in Figures 1, 2 and 6 to 9, the drain surround member 2 is installed around the drain D formed in the bathroom floor along the bathroom wall W (or bathtub, drain). In this embodiment, since the drain D is rectangular in plan view, the overall shape of the drain surround member 2 is U-shaped in plan view so as to surround three sides of the drain D other than the bathroom wall. Note that the overall shape of the drain surround member 2 is not limited to U-shaped in plan view as long as it can be installed around the drain D, and may be any other shape.

The drain surround member 2 has a flat bottom surface 3. In this embodiment, the planar shape of the bottom surface 3 is U-shaped, and the bottom surface 3 has parallel outer edges 30 and inner edges 31 extending in a U-shape. The drain surround member 2 is fixed to the surface F of the bathroom floor by fixing the bottom surface 3 to the surface F of the bathroom floor using fixing means such as adhesive or double-sided tape.

The drainage outlet surround member 2 has an outer surface 4. The outer surface 4 is adjacent to the surface floor sheet 10 and the floor underlayment 11. The outer surface 4 includes a lower first wall surface 40, an upper second wall surface 41, and a sheet support surface 42 connecting the first wall surface 40 and the second wall surface 41.

The first wall surface 40 is a flat surface that rises vertically from the outer edge 30 of the bottom surface 3. The first wall surface 3 faces the opening edge 110 of the floor underlayment material 11. The height of the first wall surface 40 is equal to or approximately equal to the thickness of the floor underlayment material 11. In this embodiment, the first wall surface 40 is in direct contact with the opening edge 110 of the floor underlayment material 11 without any gap. The first wall surface 40 may be in direct contact with the opening edge 110 of the floor underlayment material 11, or it may be in contact via an adhesive means such as adhesive, double-sided tape, or sealant.

The sheet support surface 42 is a flat surface that extends horizontally inward (towards the drain outlet D) from the upper edge of the first wall surface 40. In this embodiment, the planar shape of the sheet support surface 42 is U-shaped, and the sheet support surface 42 has parallel outer edge 420 and inner edge 421 that extend in a U-shape. The first wall surface 40 hangs down from the outer edge 420 of the sheet support surface 42. The sheet support surface 42 supports the opening edge 100 of the surface floor sheet 10 laid on the floor base material 11. The width of the sheet support surface 42 (length between the outer edge 420 and the inner edge 421) is not particularly limited, but is preferably 3 mm or more and 20 mm or less, preferably 4 mm or more and 15 mm or less, and more preferably 6 mm or more and 10 mm or less. The surface floor sheet 10 is fixed to the drainage outlet surround member 2 by fixing the opening edge 100 to the sheet support surface 42 using fixing means such as adhesive or double-sided tape.

The second wall surface 41 is a flat surface that rises perpendicularly from the inner edge 421 of the sheet support surface 42. The second wall surface 41 faces the opening edge 100 of the surface floor sheet 10. The height of the second wall surface 41 is not particularly limited, but it is preferably equal to or approximately equal to the thickness of the surface floor sheet 10. For example, the height of the second wall surface 41 is 1 mm or more and 10 mm or less, and preferably 1.5 mm or more and 5 mm or less.

The second wall surface 41 is adjacent to the opening edge 100 of the surface floor sheet 10, with a gap between them. The gap between the second wall surface 41 and the opening edge 100 of the surface floor sheet 10 is the space to be filled with the first sealant 12. The first sealant 12 prevents water from entering through the joint between the surface floor sheet 10 and the drainage outlet surround member 2.

The width of the first sealant 12 (length in the left-right direction in Figure 2) is not particularly limited, but is preferably between 2 mm and 10 mm, and between 3 mm and 5 mm. If the width of the first sealant 12 is 2 mm or more, sufficient watertightness can be ensured. Furthermore, if the width of the first sealant 12 is 10 mm or less, workability can be improved, and the exposure of the first sealant 12 can be made less noticeable.

The height of the first sealant 12 is not particularly limited, but it is preferable that it be equal to or approximately equal to the height of the second wall surface 41 and the thickness of the surface floor sheet 10. This allows the upper surface 101 of the surface floor sheet 10, the upper surface 120 of the first sealant 12, and the upper surface 5 of the drain surround member 2 to be connected flush without any steps, improving the watertightness between the drain surround member 2 and the surface floor sheet 10. Furthermore, it helps to minimize any damage to the aesthetic appearance of the bathroom.

The height of the second wall surface 41 may be the same as, greater than, or less than the thickness of the surface floor sheet 10, but it is preferable that the height of the second wall surface 41 be less than the thickness of the surface floor sheet 10. In other words, the drainage outlet surround member 2 is formed such that its upper surface 5 is lower than the upper surface 101 of the surface floor sheet 10. In this case, the first sealant 12 is not particularly limited, but it is preferable that its upper surface 120 is formed as an inclined surface that slopes downward from the surface floor sheet 10 toward the drainage outlet surround member 2 side (inward).

The drain outlet surround member 2 includes an upper surface 5. The upper surface 5 is connected to the upper edge of the second wall surface 41. In this embodiment, the planar shape of the upper surface 5 is U-shaped, and it includes parallel outer edges 52 and inner edges 53 extending in a U-shape. The upper surface 5 includes an outer flat surface 50 and an inner inclined surface 51. The width of the upper surface 5 (length in the left-right direction in Figure 3) is not particularly limited, but is preferably 5 mm or more and 50 mm or less, and preferably 10 mm or more and 20 mm or less.

The flat surface 50 is a flat surface that extends horizontally from the upper edge of the second wall surface 41 toward the inside (towards the drain outlet D). The width of the flat surface 50 (length in the left-right direction in Figure 2) is not particularly limited, but is preferably between 2 mm and 20 mm. Including the flat surface 50 on the upper surface 5 of the drain outlet surround member 2 increases the strength of the upper surface 5 of the drain outlet surround member 2. Therefore, even if a load is applied to the drain outlet surround member 2 by a user stepping on the upper surface 5 of the drain outlet surround member 2, the shape of the drain outlet surround member 2 is more easily maintained.

The inclined surface 51 is connected to the flat surface 50 and slopes downwards toward the inside (drain outlet D side), opposite to the second wall surface 41 side. The inclination angle θ of the inclined surface 51 (shown in Figure 2) is not particularly limited, but is preferably between 20° and 80°. By including the inclined surface 51 on the upper surface 5 of the drain outlet surround member 2, water can be smoothly guided from the surface floor sheet 10 through the drain outlet surround member 2 to the drain outlet D. In this embodiment, the inclined surface 51 is a straight-sloping plane, but it may also be a curved surface (concave or convex).

The drain outlet surround member 2 includes an inner surface 6. The inner surface 6 is located on the drain outlet D side, opposite the outer surface 4. The drain outlet surround member 2 is installed so that the inner surface 6 is located near the drain outlet D. The inner surface 6 is a flat surface that rises vertically from the inner edge 31 of the bottom surface 3 and hangs down from the inner edge 53 of the top surface 5. The height of the inner surface 6 is not particularly limited, but is preferably between 3 mm and 10 mm.

The inner surface 6 has a gap between it and the drain opening D. This gap is filled with the second sealant 13. The second sealant 13 prevents water from seeping in through the joint between the drain opening surround member 2 and the surface F of the bathroom floor. Furthermore, since the inner surface 6 of the drain opening surround member 2 is covered with the second sealant 13, it prevents the drain opening surround member 2 from peeling off from the inside (drain opening D side).

The width of the second sealant 13 (maximum length in the left-right direction in Figure 2) is not particularly limited, but is preferably between 3 mm and 20 mm, and more preferably between 3 mm and 10 mm. If the width of the second sealant 13 is 3 mm or more, sufficient watertightness can be ensured. Furthermore, if the width of the second sealant 13 is 20 mm or less, workability can be improved, and the exposure of the second sealant 13 can be made less noticeable.

The second sealant 13 is not particularly limited, but it is preferable that its upper surface 130 slopes downward toward the inside (towards the drain outlet D) such that the side in contact with the inner surface 6 of the drain outlet surround member 2 is the highest and the side facing the drain outlet D is the lowest. This allows water to be smoothly guided from the drain outlet surround member 2 through the second sealant 13 to the drain outlet D.

The drain outlet surround member 2 is provided with a pair of end faces 7. The pair of end faces 7 are flat surfaces that rise vertically from both side edges 32 of the bottom surface 3. The outer surface 4, top surface 5, and inner surface 6 extend between the pair of end faces 7.

The drain surround member 2, having the shape described above, is not particularly limited, but it is preferably made of a material that satisfies the durability required for use on bathroom floors, such as water resistance, abrasion resistance, and impact resistance, for example, metal or resin. The drain surround member 2 may be formed as a single unit by, for example, injection molding, but it is preferable that it be divided into multiple components and formed by connecting these components.

In this embodiment, a drain surround member 2, shaped like a U in plan view, is formed by combining linear members 20 extending along each side of a rectangular drain opening D, as shown in Figure 10, and corner members 21 installed at the corners of the drain opening D. In this embodiment, the drain surround member 2, shaped like a U in plan view, is formed by combining four linear members 20 and two corner members 21. While this embodiment uses two linear members 20 between two corner members 21, a modified example would involve connecting the two corner members 21 with a single, longer linear member 20. This modified example is preferable because it prevents water from entering through the joints of the linear members 20 between the two corner members 21, and also increases the strength of the drain surround member 2.

The material of the linear member 20 and the corner member 21 is not particularly limited, but a soft resin or semi-rigid resin is preferably used. Examples of soft resins or semi-rigid resins include polyvinyl chloride resin, ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin), polyurethane resin, and polystyrene resin. Among these, polyvinyl chloride resin is preferably used as the material for the linear member 20 and the corner member 21 because it offers excellent processability, easy hardness adjustment, and lower manufacturing costs. The linear member 20 and the corner member 21 can be formed, for example, by extrusion molding using the soft resin or semi-rigid resin described above.

Because the linear member 20 is soft or semi-rigid, the installer can cut the linear member 20 at any point along its length using a cutting tool such as a cutter. Therefore, by preparing a sufficiently long linear member 20 and cutting it to the desired length on-site according to the size (length of one side) of the drain opening D, a drain surround member 2 that fits the size of the drain opening D can be easily formed, even if the size of the drain opening D varies from bathroom to bathroom. Thus, the drain surround member 2 can be installed around the drain opening D without overlapping the drain opening D.

As shown in Figures 11(A) to (C), the linear member 20 has the aforementioned bottom surface 3, outer surface 4, top surface 5, and inner surface 6 extending straight in one direction, and a pair of end faces 8A at both ends in one direction (length direction). As shown in Figures 12(A) to (C), the corner member 21 has the aforementioned bottom surface 2, outer surface 3, and top surface 4 extending in an L-shape, and a pair of end faces 8B at both ends of the L-shape. The pair of end faces 8A of the linear member 20 and the pair of end faces 8B of the corner member 21 are the same size and shape. In the drainage outlet surround member 2 shown in Figure 10, one end face 8A of the two linear members at both ends constitutes the pair of end faces 7 of the drainage outlet surround member 2.

The linear members 20 and corner members 21, and the two linear members 20, can be connected to each other by, for example, bonding their respective end faces together with adhesive, double-sided tape, sealant, or other adhesive means. Alternatively, a watertight member may be inserted between the end faces of each member 20 and 21 to improve watertightness. Or, for example, one or more protrusions may be provided on the end face of one of the two members to be connected, and one or more fitting holes may be formed on the end face of the other member. The two members can then be connected by fitting the protrusions into the fitting holes.

In this embodiment, the linear member 20 and the corner member 21 are solid, but they may also be hollow with an internal cavity. Furthermore, the linear member 20 may be hollow and the corner member 21 may be solid. If each member 20 and 21 is solid, their strength can be improved; if each member 20 and 21 is hollow, their weight can be reduced. If the linear member 20 is hollow and the corner member 21 is solid, a projection that fits into the cavity of the linear member 20 may be provided on the end face 8B of the corner member 21, and the linear member 20 and the corner member 21 may be connected by fitting the projection into the cavity of the linear member 20.

In this embodiment, a U-shaped drainage outlet surround member 2 is formed by combining four linear members 20 and two corner members 21. However, the drainage outlet surround member 2 can also be formed without using corner members 21. For example, as shown in Figure 13(A), a U-shaped drainage outlet surround member 2 may be formed by combining four linear members 22, each with one end cut diagonally. Alternatively, as shown in Figure 13(B), a U-shaped drainage outlet surround member 2 may be formed by combining two linear members 22, each with one end cut diagonally, and one linear member 23, both ends cut diagonally. Alternatively, as shown in Figure 13(C), a U-shaped drainage outlet surround member 2 may be formed by combining two L-shaped members 24.

Surface floor sheet 10 is a sheet material that improves the design and functionality of the bathroom floor. The surface floor sheet 10 is not particularly limited, but from the viewpoint of watertightness and ease of installation, it is preferable to consist of a single sheet material without joints. The surface floor sheet 10 is usually stored and transported in long lengths wound into rolls, and cut on site according to the shape and size of the bathroom floor.

The functionality of the surface floor sheet 10 includes improvements in slip resistance, cushioning, and heat insulation. The surface floor sheet 10's moderate cushioning allows it to absorb the impact of falls. Furthermore, the surface floor sheet 10's moderate heat insulation reduces heat shock in the bathroom and enhances the feeling of warmth upon contact. To improve cushioning and heat insulation, it is preferable that the surface floor sheet 10 includes a foamed layer. While the entire surface floor sheet 10 may be formed from a foamed layer, to improve slip resistance, it is preferable to include a non-foamed surface layer on top of the foamed layer, with resistant protrusions or inclined surfaces formed on its surface. In other words, the surface floor sheet 10 may be a single-layer structure or a multi-layer structure of two or more layers. Furthermore, it is preferable that the surface floor sheet 10 has the flexibility to be rolled up. This allows for easy storage and transportation of the surface floor sheet 10, and easy delivery into the bathroom during installation.

The material of the surface floor sheet 10 is not particularly limited as long as it can be used on the bathroom floor. The surface floor sheet 10 can be formed from a flexible resin material such as polyvinyl chloride resin or olefin resin. Among these, polyvinyl chloride resin is preferable as the main resin component because it offers excellent flexibility, processability, durability, and cost-effectiveness for the surface floor sheet 10. Because polyvinyl chloride resin has excellent flexibility, it can make the surface of the bathroom floor F flexible after installation. Furthermore, it has the advantage of being easily stored and transported by rolling up the surface floor sheet 10, and easily brought into the bathroom during installation.

The surface of the surface floor sheet 10 is not particularly limited, but it is preferable to have a lower gloss level rather than a higher one. This makes it difficult for the human eye to see unevenness or irregularities of the substrate when they are exposed on the surface of the surface floor sheet 10. The gloss level (60°) required to make exposed irregularities difficult for the human eye to see is preferably 0.3 to 60, and more preferably 0.5 to 30. The gloss level (60°) can be measured using a gloss meter such as GM-3D (manufactured by Murakami Color Technology Laboratory Co., Ltd.). Methods for lowering the gloss level include, for example, adding a matting agent such as silica or plastic beads to the surface layer of the surface floor sheet 10, or forming fine irregularities on the surface separately from the protrusions or inclined surfaces provided to provide anti-slip properties. Smaller fine embossing tends to suppress gloss more than larger fine embossing. The formation of fine irregularities causes light hitting the surface of the surface floor sheet 10 to be diffusely reflected, resulting in lower gloss. The surface roughness of the fine irregularities is not particularly limited, but if it is too rough, it may appear to have a high gloss depending on the direction of light reflection, while if it is too fine, it may become almost indistinguishable from a mirror surface. From this viewpoint, the surface roughness (centerline mean roughness (Ra) in accordance with JIS B 0601) is preferably 5 μm to 15 μm, and more preferably 6 μm to 10 μm. The irregularities and protrusions on the surface of the surface floor sheet 10 are usually formed by embossing. The embossing method is not particularly limited, and known sheet-fed or rotary embossing machines can be used. Examples of irregular shapes include wood grain grooves, stone slab surface irregularities (granite cleavage surfaces, etc.), fabric surface texture, pearlescent, sandy, hairline, fine grooves, V-cut, fine mesh, fine dots, stripes, etc. Fine irregularities can be created not only through embossing, but also by roughening the surface through methods such as sandblasting or filing, or by embedding fine particles such as fillers into the surface. Adding such fine irregularities makes it easier to conceal any surface irregularities that may have appeared on the surface of the floor sheet 10.

The surface floor sheet 10 or the surface layer of the surface floor sheet 10 may, as necessary, contain weather-resistant agents, plasticizers, stabilizers, fillers, dispersants, colorants such as dyes and pigments, solvents, etc.

The surface floor sheet 10 may include one or more reinforcing layers to increase its rigidity and provide shape and dimensional stability. Including reinforcing layers in the thickness direction of the surface floor sheet 10 can suppress the appearance of irregularities on the surface of the surface floor sheet 10. Examples of reinforcing layers include glass mats, glass nets, resin mats, resin nets, nonwoven fabrics or felts made of inorganic or organic fibers, and woven fabrics. Among these, it is preferable to use glass fibers for the reinforcing layer because they have excellent strength and small dimensional changes. The glass fibers are not particularly limited, but glass fiber woven fabrics or nonwoven fabrics with a basis weight of 10 g/ ^m² to 100 g/ ^m² are particularly preferred. By having the basis weight of the glass fibers within the above range, it is possible to effectively suppress the appearance of irregularities on the surface of the surface floor sheet 10. For woven fabrics or nonwoven fabrics using other fibers such as polyester, a similar basis weight is also preferred.

The surface floor sheet 10 may include a base layer at the bottom to enhance the adhesive strength of the adhesive portion between the surface floor sheet 10 and the floor base material 11 located beneath it, and to prevent displacement of the non-adhesive portion. The base layer is not particularly limited, but conventionally known sheet materials such as nonwoven fabrics, woven fabrics, paper, and felt can be used. The fibers constituting the nonwoven or woven fabric are not particularly limited, but examples include resin fibers such as polyester and polyolefin; inorganic fibers such as glass and carbon; and natural fibers. The nonwoven fabric is not particularly limited, but examples include spunbond nonwoven fabrics, thermal bond nonwoven fabrics, chemical bond nonwoven fabrics, needle-punched nonwoven fabrics, and spunlace nonwoven fabrics. These can be used individually or in combination of two or more. Among these, spunbond nonwoven fabrics are preferred because they can form a thin yet strong reinforcing layer, and spunbond nonwoven fabrics composed of polypropylene fibers are more preferred.

The thickness of the base layer is not particularly limited, but is preferably 0.1 mm to 0.5 mm, and more preferably 0.2 mm to 0.4 mm. The basis weight of the base layer is not particularly limited, but is preferably 30 g/ ^m² to 70 g/ ^m² . By having the thickness and basis weight of the base layer within the above ranges, it is possible to effectively suppress the appearance of irregularities on the surface of the surface floor sheet 10.

The thickness of the surface floor sheet 10 is not particularly limited, but is, for example, 1.8 mm or more and 4.0 mm or less, preferably 2.0 mm or more and 3.5 mm or less. The thickness of the surface floor sheet 10 refers to the maximum thickness when the thickness is uneven, such as when embossing is applied. A thickness of 1.8 mm or more ensures sufficient strength of the surface floor sheet 10 and effectively suppresses the appearance of unevenness on the surface of the surface floor sheet 10. Furthermore, a thickness of 4.0 mm or less increases the flexibility of the surface floor sheet 10, improving workability when installing the surface floor sheet 10 in a narrow bathroom. As the surface floor sheet 10, for example, "Basna Real Design," "Basna Flore," and "Basna Alti," which are vinyl floor sheets for bathrooms and baths manufactured by Toli Corporation, can be suitably used. The thicknesses are 3.5 mm for "Basna Real Design" and "Basna Flore," and 2.8 mm for "Basna Alti."

The underlayment material 11 is placed beneath the surface floor sheet 10 and is a component that effectively improves the functionality of the bathroom floor. Functional improvements include, for example, improved shock absorption, cushioning, and heat insulation, as well as reduced noise generation. The underlayment material 11 has high shock absorption and cushioning properties, which effectively absorbs the impact when a user falls. In addition, the underlayment material 11 has high heat insulation properties, which effectively reduces heat shock in the bathroom and effectively enhances the feeling of warmth upon contact. The underlayment material 11 is not particularly limited in its composition as long as it can perform these functions, but examples include foamed type and non-foamed type.

The underfloor material 11 can be a cushioning material and/or an insulating material. The cushioning material is not particularly limited as long as it is elastically deformable, but for example, foams such as urethane, polyvinyl chloride, or polyethylene can be used. The foam has both cushioning and insulating properties. The insulating material is not particularly limited, but needle-punched nonwoven fabric or felt can be used. The fibers constituting the needle-punched nonwoven fabric or felt are not particularly limited, but examples include rock wool and glass wool.

The thickness of the subfloor material 11 is not particularly limited, but is, for example, 0.5 mm or more and 50 mm or less, preferably 2 mm or more and 25 mm or less. A thickness of 50 mm or less for the subfloor material 11 allows for good workability. A thickness of 0.5 mm or more for the subfloor material 11 enhances cushioning, shock absorption, and heat insulation, and also reduces noise generation. As the subfloor material 11, for example, a 4.5 mm thick "underlay sheet" long sheet manufactured by Toli Corporation can be suitably used. Furthermore, as the subfloor material 11 has good cushioning properties, for example, an elastic deformation structure can be suitably used that is hard and less likely to cause falls when walked on normally, but changes shape and the surface indents to absorb impact when an impact is applied due to a fall or the like. This elastically deformable structure can be, for example, a hollow three-dimensional structure made of an elastic material such as rubber, which absorbs the impact by elastically deforming and collapsing its three-dimensional structure when pressure exceeding a threshold is applied due to impact, and reversibly returns to its original three-dimensional structure when the pressure is removed. Furthermore, as an elastically deformable structure, those described in Japanese Patent Publication No. 2019-525783, Japanese Patent Publication No. 04-030508, International Publication WO2022/092111, International Publication WO2021/107157, Japanese Patent No. 6951741, and Chinese Utility Model Publication CN213296986U can be suitably used.

The first sealant 12 and the second sealant 13 described above are not particularly limited, but for example, one-component silicone sealants, one-component modified silicone sealants, two-component silicone sealants, two-component modified silicone sealants, two-component epoxy sealants, two-component polysulfide sealants, one-component polyurethane sealants, two-component polyurethane sealants, etc., can be used. Two-component sealants need to be mixed before application, but they provide a strong and durable finish. One-component sealants do not require prior mixing and offer excellent workability. One-component modified silicone sealants are suitable for use as the first sealant 12 and the second sealant 13 due to their excellent workability and superior bonding with polyvinyl chloride resin. In general, caulking agents are used synonymously with sealants, so in this disclosure, sealants are assumed to include caulking agents.

Installation Method for Bathroom Floor in the First Embodiment Next, the installation method for the bathroom floor in the first embodiment will be described. First, if the surface F of the bathroom floor shown in Figure 4 has large irregularities, cracks, etc., a smoothing treatment should be performed using a base repair material as necessary. If the surface F of the bathroom floor is made of ceramic tile material or fiber-reinforced plastic (FRP) panel material, for example, "Basna Putty EPO (manufactured by Toli Corporation)" can be suitably used as the base repair material.

Next, as shown in Figure 14, the drain surround member 2 is installed around the drain opening D on the surface F of the bathroom floor. The drain surround member 2 is fixed to the surface F of the bathroom floor using adhesive or double-sided tape. For efficiency in installation, using double-sided tape is preferable.

The double-sided tape may be attached to the surface F of the bathroom floor along three sides of the drain opening D, but it is preferable to attach it to the bottom surface 3 of the drain opening surround member 2. The same applies when using adhesive. It is preferable to install the drain opening surround member 2 at a distance of 5 mm or more from the drain opening D.

The drain surround member 2 is preferably fixed not only to the surface F of the bathroom floor, but also to the bathroom wall W, as shown in Figure 15. Specifically, the pair of end faces 7 of the drain surround member 2 are fixed to the bathroom wall W using an adhesive or double-sided tape, preferably double-sided tape 15. This allows the drain surround member 2 to be firmly fixed to the surface F of the bathroom floor.

Furthermore, if the drainage outlet surround member 2 is formed by a combination of multiple members 20-24 as shown in Figures 10 and 13, it is preferable to cover the joint S between two adjacent connected members E1 and E2 with waterproof tape 14, as shown in Figure 16. Note that the waterproof tape 14 also includes sealing tape.

The waterproofing tape 14 may be attached to the drainage outlet member 2 so as to cover the seams S on each surface 4-6 of the drainage outlet member 2, but preferably it can be attached to the drainage outlet member 2 so as to cover the seams S on the first wall surface 40 and the sheet support surface 42 of the outer surface 4 of the drainage outlet member 2. The seams S on the inner surface 6 of the drainage outlet member 2 are covered by the second sealant 13, so they do not necessarily need to be covered with the waterproofing tape 14. Similarly, the seams S on the second wall surface 41 of the outer surface 4 of the drainage outlet member 2 are covered by the first sealant 12, so they do not necessarily need to be covered with the waterproofing tape 14. The seams S on the upper surface 5 of the drainage outlet member 2 are not necessarily covered with the waterproofing tape 14 because the entire outer surface 4 is covered with waterproofing material.

Next, as shown in Figure 17, in order to lay the subfloor material 11 on the surface F of the bathroom floor, fixing means such as adhesive or double-sided tape are provided on the surface F of the bathroom floor. From the perspective of efficiency of construction work, it is preferable to attach double-sided tape 15 to the surface F of the bathroom floor. The location on the surface F of the bathroom floor to which the double-sided tape 15 is attached is not particularly limited. The double-sided tape 15 may be attached to the entire surface F of the bathroom floor, but if at least the outer edge and opening edge 110 of the subfloor material 11 are fixed to the surface F of the bathroom floor, it is possible to suppress water from seeping between the subfloor material 11 and the surface F of the bathroom floor. For this reason, from the perspective of efficiency of construction work, the double-sided tape 15 may be attached only to a part of the surface F of the bathroom floor. Furthermore, in order to firmly fix the subfloor material 11 to the surface F of the bathroom floor, it is preferable to apply double-sided tape 15 to the surface F of the bathroom floor so that the outer edge and opening edge 110 of the subfloor material 11, as well as multiple locations inside the outer edge of the subfloor material 11, are fixed to the surface F of the bathroom floor. The same applies when using adhesive.

Next, as shown in Figure 18, the subfloor material 11 is laid on the surface F of the bathroom floor. When laying the subfloor material 11 on the surface F of the bathroom floor, the opening edge 110 of the subfloor material 11 is brought into contact with the first wall surface 40 of the outer surface 4 of the drain surround member 2. At this time, it is preferable to fix the opening edge 110 of the subfloor material 11 to the first wall surface 40 of the drain surround member 2 using adhesive or double-sided tape, preferably double-sided tape. Once the subfloor material 11 has been laid, the entire upper surface of the subfloor material 11 is pressed down using a pressure roller or the like. This firmly secures the subfloor material 11 to the surface F of the bathroom floor.

Next, as shown in Figure 19, in order to lay the surface floor sheet 10 on the subfloor material 11, fixing means such as adhesive or double-sided tape are provided on the upper surface of the subfloor material 11. From the perspective of efficiency of construction work, it is preferable to attach double-sided tape 15 to the upper surface of the subfloor material 11. The location on the upper surface of the subfloor material 11 to which the double-sided tape 15 is attached is not particularly limited. The double-sided tape 15 may be attached to the entire upper surface of the subfloor material 11, but if at least the outer peripheral edge and opening edge 100 of the surface floor sheet 10 are fixed to the subfloor material 11, water can be prevented from seeping between the subfloor material 11 and the surface floor sheet 10. For this reason, from the perspective of efficiency of construction work, the double-sided tape 15 may be attached only to a part of the upper surface of the subfloor material 11. Furthermore, in order to firmly fix the surface floor sheet 10 to the subfloor material 11, it is preferable to apply double-sided tape 15 to the upper surface of the subfloor material 11 so that the outer edge and opening edge 100 of the surface floor sheet 10, as well as multiple locations inside the outer edge of the surface floor sheet 10, are fixed to the subfloor material 11. The same applies when using adhesive.

Next, as shown in Figure 20, the surface floor sheet 10 is laid on top of the subfloor material 11. When laying the surface floor sheet 10 on top of the subfloor material 11, the opening edge 100 of the surface floor sheet 10 is placed on the sheet support surface 42 on the outer surface 4 of the drainage outlet surround member 2. At this time, it is preferable to fix the opening edge 100 of the surface floor sheet 10 to the sheet support surface 42 using adhesive or double-sided tape, preferably double-sided tape. A gap exists between the opening edge 100 of the surface floor sheet 10 and the second wall surface 41 on the outer surface 4 of the drainage outlet surround member 2. Once the surface floor sheet 10 is laid, the entire upper surface of the surface floor sheet 10 is pressed down using a pressure roller or the like. This firmly secures the surface floor sheet 10 to the subfloor material 11.

Finally, sealing is performed using a sealant. Specifically, as shown in Figures 1 and 2, the gap between the opening edge 100 of the surface floor sheet 10 and the second wall surface 41 on the outer surface 4 of the drain surround member 2 is filled with the first sealant 12 using a caulking gun or the like. The space between the inner surface 6 of the drain surround member 2 and the drain D is then filled with the second sealant 13 using a caulking gun or the like, covering the inner surface 6 with the second sealant 13. Furthermore, if there are gaps between the outer edges of the surface floor sheet 10 and the underlayment 11 and the bathroom wall W or bathtub, these gaps are filled with sealant using a caulking gun or the like. This prevents water from penetrating between the surface floor sheet 10 and the underlayment 11 and the surface F of the bathroom floor.

The bathroom floor structure 1 of the first embodiment is completed by the construction method described above. The adhesives and double-sided tapes used in the above-described construction method are not particularly limited as long as they can be used to adhere the drain surround member 2 and the subfloor material 11 to the surface F of the bathroom floor, adhere the surface floor sheet 10 to the subfloor material 11, or adhere the surface floor sheet 10 and subfloor material 11 to the drain surround member 2; conventionally known adhesives and tapes can be used. It is preferable to use adhesives and double-sided tapes that have excellent adhesive strength, water resistance, substrate unevenness following ability, plasticizer resistance, creep resistance, and ease of peeling. For example, "Basna Tape (manufactured by Toli Corporation)" can be suitably used as the double-sided tape.

Operation and Effects of the First Embodiment According to the first embodiment described above, the drainage outlet surround member 2, which is installed between the surface floor sheet 10 and the underlayment 11 laid on the surface F of the bathroom floor and the drainage outlet D formed in the bathroom floor, has an outer surface 4 adjacent to the surface floor sheet 10 and the underlayment 11, a lower first wall surface 40 facing the underlayment 11, an upper second wall surface 41 facing the surface floor sheet 10, and a sheet support surface 42 on which a portion of the surface floor sheet 10 is placed.

In the first embodiment, the outer surface 4 of the drainage outlet surround member 2 is not a straight plane extending from the lower edge to the upper edge, but a stepped surface having a sheet support surface 42 between a lower and outer first wall surface 40 facing the floor base material 11 and an upper and inner second wall surface 41 facing the surface floor sheet 10. The opening edge 100 of the surface floor sheet 10 is placed on the sheet support surface 42, and the first sealant 12 is filled into the gap between the second wall surface 41 and the opening edge 100 of the surface floor sheet 10. This allows the opening edge 100 of the surface floor sheet 10 to be fixed to the sheet support surface 42 using adhesive or double-sided tape. Even if a user steps on the surface floor sheet 10 near the drainage area member 2, causing a significant indentation in the subfloor material 11, the fixation between the surface floor sheet 10 and the drainage area member 2 can be maintained, preserving the waterproofing treatment (first sealant 12) applied between the surface floor sheet 10 and the drainage area member 2. Therefore, water penetration between the surface floor sheet 10 and the drainage area member 2 can be suppressed.

Furthermore, in the first embodiment, since the drain surround member 2 has a portion facing the subfloor material 11 and a portion facing the surface floor sheet 10, even if the subfloor material 11 is laid on the surface F of the bathroom floor together with the surface floor sheet 10, and the drain surround member 2 is installed around the drain D as a trim piece, it is possible to suppress the occurrence of a large step difference between the outermost surface floor sheet 10 and the drain surround member 2. Therefore, the risk of users tripping over the step is reduced, improving safety, and the aesthetic appeal of the bathroom is not spoiled by the presence of the step.

Furthermore, according to the first embodiment, the drain outlet surround member 2 includes an inclined surface 51 on its upper surface 5 that slopes downward toward the drain outlet D. By including the inclined surface 51 on the upper surface 5 of the drain outlet surround member 2, water can be smoothly guided from the surface floor sheet 10 through the drain outlet surround member 2 to the drain outlet D.

Furthermore, according to the first embodiment, the upper surface 5 of the drainage outlet surround member 2 includes a flat surface 50 that extends horizontally from the upper edge of the second wall surface 41 of the outer surface 4 toward the drainage outlet D. Including the flat surface 50 on the upper surface 5 of the drainage outlet surround member 2 increases the strength of the upper surface 5. Therefore, even if a load is applied to the drainage outlet surround member 2 by a user stepping on its upper surface 5, the shape of the drainage outlet surround member 2 is more easily maintained.

Furthermore, according to the first embodiment, in the drain surround member 2, the inner surface 6 hangs down from the inner edge 53 of the upper surface 5. In the drain surround member 2, the inner surface 6 on the side closer to the drain D is a surface that rises perpendicularly to the surface F of the bathroom floor. Therefore, when filling the space between the inner surface 6 and the drain D with the second sealant 13, the inner surface 6 acts as a wall, making it easier to apply the second sealant 13.

Modifications of the First Embodiment The first embodiment can be modified in the following ways, for example. The gist of the following modifications can be combined as appropriate.

In the drain outlet surround member 2, the upper surface 5 does not necessarily have to include both an outer flat surface 50 (facing the surface floor sheet 10 and floor underlayment 11) and an inner inclined surface 51 (facing the drain outlet D). As shown in Figure 21(A), the upper surface 5 may include only the flat surface 50, with the flat surface 50 connected to the upper edge of the inner surface 6. Alternatively, as shown in Figure 21(B), the upper surface 5 may include only the inclined surface 51, with the inclined surface 51 connected to the upper edge of the second wall surface 41 of the outer surface 4. The inclined surface 51 may be a straight, sloping plane or a curved surface (concave or convex).

In the drain outlet surround member 2, the upper surface 5, as shown in Figure 21(C), includes only a flat surface 50, which is connected to the upper edge of the inner surface 6. The inner surface 6 may also include an upper third wall surface 60 hanging down from the inner edge 53 of the upper surface 5, a fourth wall surface 61 rising vertically from the inner edge 31 of the bottom surface 3 and located inward (towards the drain outlet D) from the third wall surface 60, and a horizontal surface 62 connecting the third wall surface 60 and the fourth wall surface 61.

The drain outlet surround member 2 does not necessarily need to have an inner surface 6. As shown in Figure 21(D), the inclined surface 51 on the upper surface 5 may be connected to the inner edge 31 of the bottom surface 3, and the inclined surface 51 may extend between the flat surface 50 and the bottom surface 3. Alternatively, as shown in Figure 21(E), the upper surface 5 may consist only of the inclined surface 51, and the inclined surface 51 may be connected to the upper edge 31 of the second wall surface 41 of the outer surface 4 and the inner edge 31 of the bottom surface 3, and the inclined surface 51 may extend between the second wall surface 41 and the bottom surface 3.

As shown in Figures 22 and 23, the drainage outlet surround member 2 may include a plate-like portion 9 that protrudes horizontally outward from the lower edge of the first wall surface 40 on the outer surface 4 (in other words, the lower edge of the outer surface 4) and on which a portion of the floor base material 11 can be placed. The plate-like portion 9 can be made of a single long, thin plate extending continuously from one end face 7 to the other end face 7 of the drainage outlet surround member 2. In this embodiment, the planar shape of the plate-like portion 9 is U-shaped. The plate-like portion 9 does not necessarily have to be made of a single long, thin plate; it may be made of short thin plates or small pieces, and multiple plate-like portions 9 may be arranged at intervals from one end face 7 to the other end face 7 of the drainage outlet surround member 2.

The protruding length of the plate-like portion 9 is not particularly limited, but is preferably 0.5 mm to 50 mm. The thickness of the plate-like portion 9 is not particularly limited, but is preferably 0.1 mm to 2 mm.

The drain surround member 2 comprises one or more plate-like portions 9. For example, by attaching adhesive or double-sided tape (preferably double-sided tape) to the lower surface of the plate-like portion 9, and fixing the plate-like portion 9 to the surface F of the bathroom floor, the drain surround member 2 can be firmly fixed to the surface F of the bathroom floor. Furthermore, the opening edge 110 of the floor base material 11, which faces the first wall surface 40 of the drain surround member 2, rests on the plate-like portion 9. Therefore, by attaching adhesive or double-sided tape (preferably double-sided tape) to the upper surface of the plate-like portion 9 and adhering the opening edge 110 of the floor base material 11 to the plate-like portion 9, the floor base material 11 can be fixed to the drain surround member 2.

Figures 24 and 25 show the bathroom floor structure 1 of the second embodiment . In the bathroom floor structure 1 of the second embodiment, the same reference numerals are used for components that are the same as those in the bathroom floor structure 1 of the first embodiment.

The second embodiment of the bathroom floor structure 1 is a floor structure in which a surface floor sheet 10 and a subfloor material 11 are laid on the surface F of a bathroom floor where a drain opening D is formed internally, rather than along the wall as shown in Figure 26. The subfloor material 11 is laid on the surface F of the bathroom floor, and the surface floor sheet 10 is laid on top of the subfloor material 11, using adhesive means such as adhesive or double-sided tape. The surface floor sheet 10 constitutes the surface of the bathroom floor after renovation.

Figure 27(A) shows the opening edge 100 and opening O1 of the surface floor sheet 10 in a plan view, and Figure 27(B) shows the opening edge 110 and opening O2 of the floor underlayment material 11 in a plan view. Figure 27(C) shows the opening edges 100, 110 and openings O1, O2 in a state where the surface floor sheet 10 is laid on the floor underlayment material 11. The surface floor sheet 10 and the floor underlayment material 11 have openings O1 and O2 that are slightly larger than the drain opening D, as shown in Figures 27(A) and (B), so as not to cover and block the drain opening D. In the second embodiment, the openings O1 and O2 are formed in the parts inside the outer peripheral edges of the surface floor sheet 10 and the floor underlayment material 11. These openings O1 and O2 have a shape that matches the plan view shape of the drain opening surround member 2, and in this embodiment, they are rectangular in plan view, the same as the drain opening D. As shown in Figure 27(C), the opening O2 formed in the floor underlayment 11 is slightly larger than the opening O1 formed in the surface floor sheet 10. The difference in size between openings O1 and O2 in the vertical and horizontal directions (up/down and left/right directions in Figure 27) is not particularly limited, but it is preferably between 5 mm and 20 mm.

As shown in Figures 24 and 25, the surface floor sheet 10 and the underlayment 11 are laid on the surface F of the bathroom floor, excluding the drain opening D. The opening edges 100 and 110 of the surface floor sheet 10 and underlayment 11, located around the drain opening D, have a gap between them and the drain opening D. The drain opening surround member 2 is installed in this gap. The drain opening surround member 2 is installed around the drain opening D. The drain opening surround member 2 is installed on the surface F of the bathroom floor using fixing means such as adhesive or double-sided tape.

The drain surround member 2 is installed so that its outer surface 4 is adjacent to the surface floor sheet 10 and the subfloor material 11. In other words, the outer surface 4 of the drain surround member 2 faces the opening edges 100 and 110 located around the drain D in the surface floor sheet 10 and the subfloor material 11. Note that in the drain surround member 2, the side facing the drain D is considered the inside, and the opposite side facing the surface floor sheet 10 and subfloor material 11 is considered the outside.

The subfloor material 11 is laid on the surface F of the bathroom floor so that its opening edge 110 faces the outer surface 4 of the drain surround member 2. Here, "facing" includes cases where the opening edge 110 of the subfloor material 11 abuts against the outer surface 4 of the drain surround member 2 without any gap between them, and cases where there is a gap between them. The surface floor sheet 10 is laid on top of the subfloor material 11 so that its opening edge 100 has a gap between it and the outer surface 4 of the drain surround member 2. The gap between the opening edge 100 of the surface floor sheet 10 and the outer surface 4 of the drain surround member 2 is filled with the first sealant 12.

The drain surround component 2 has an inner surface 6 opposite the outer surface 4 located near the drain opening D, with a gap between the inner surface 6 and the drain opening D. This gap is filled with the second sealant 13.

Next, the various components used in the bathroom floor structure 1 of the second embodiment will be described.

As shown in Figures 25 and 28 to 31, the drain surround member 2 is installed around the drain D, which is formed inside the surface F of the bathroom floor, rather than at the wall edge. In this embodiment, since the drain D is rectangular in plan view, the overall shape of the drain surround member 2 is a rectangular frame in plan view that surrounds the drain D on all four sides. However, the overall shape of the drain surround member 2 is not limited to a rectangular frame in plan view, as long as it can be installed around the drain D, and may be any other shape of frame.

The drain surround member 2 has a flat bottom surface 3. In this embodiment, the planar shape of the bottom surface 3 is U-shaped, and the bottom surface 3 has parallel outer edges 30 and inner edges 31 extending in an U-shape. The drain surround member 2 is fixed to the surface F of the bathroom floor by fixing the bottom surface 3 to the surface F of the bathroom floor using fixing means such as adhesive or double-sided tape.

The drainage outlet surround member 2 has an outer surface 4. The outer surface 4 is adjacent to the surface floor sheet 10 and the floor underlayment 11. The outer surface 4 includes a lower first wall surface 40, an upper second wall surface 41, and a sheet support surface 42 connecting the first wall surface 40 and the second wall surface 41.

The first wall surface 40 is a flat surface that rises vertically from the outer edge 30 of the bottom surface 3. The first wall surface 3 faces the opening edge 110 of the floor underlayment material 11. The height of the first wall surface 40 is equal to or approximately equal to the thickness of the floor underlayment material 11. In this embodiment, the first wall surface 40 is in direct contact with the opening edge 110 of the floor underlayment material 11 without any gap. The first wall surface 40 may be in direct contact with the opening edge 110 of the floor underlayment material 11, or it may be in contact via an adhesive means such as adhesive, double-sided tape, or sealant.

The sheet support surface 42 is a flat surface that extends horizontally inward (towards the drain outlet D) from the upper edge of the first wall surface 40. In this embodiment, the planar shape of the sheet support surface 42 is U-shaped, and the sheet support surface 42 has parallel outer edge 420 and inner edge 421 extending in an U-shape. The first wall surface 40 hangs down from the outer edge 420 of the sheet support surface 42. The sheet support surface 42 supports the opening edge 100 of the surface floor sheet 10 laid on the floor base material 11. The width of the sheet support surface 42 (length between the outer edge 420 and the inner edge 421) is not particularly limited, but is preferably 3 mm or more and 20 mm or less, preferably 4 mm or more and 15 mm or less, and more preferably 6 mm or more and 10 mm or less. The surface floor sheet 10 is fixed to the drainage outlet surround member 2 by fixing the opening edge 100 to the sheet support surface 42 using fixing means such as adhesive or double-sided tape.

The second wall surface 41 is a flat surface that rises perpendicularly from the inner edge 421 of the sheet support surface 42. The second wall surface 41 faces the opening edge 100 of the surface floor sheet 10. The height of the second wall surface 41 is not particularly limited, but it is preferably equal to or approximately equal to the thickness of the surface floor sheet 10. For example, the height of the second wall surface 41 is 1 mm or more and 10 mm or less, and preferably 1.5 mm or more and 5 mm or less.

The second wall surface 41 is adjacent to the opening edge 100 of the surface floor sheet 10, with a gap between them. The gap between the second wall surface 41 and the opening edge 100 of the surface floor sheet 10 is the space to be filled with the first sealant 12. The first sealant 12 prevents water from entering through the joint between the surface floor sheet 10 and the drainage outlet surround member 2.

The width of the first sealant 12 (length in the left-right direction in Figure 25) is not particularly limited, but is preferably 2 mm to 10 mm, and more preferably 3 mm to 5 mm. If the width of the first sealant 12 is 2 mm or more, sufficient watertightness can be ensured. Furthermore, if the width of the first sealant 12 is 10 mm or less, workability can be improved, and the exposure of the first sealant 12 can be made less noticeable.

The height of the first sealant 12 is not particularly limited, but it is preferable that it be equal to or approximately equal to the height of the second wall surface 41 and the thickness of the surface floor sheet 10. This allows the upper surface 101 of the surface floor sheet 10, the upper surface 120 of the first sealant 12, and the upper surface 5 of the drain surround member 2 to be connected flush without any steps, improving the watertightness between the drain surround member 2 and the surface floor sheet 10. Furthermore, it helps to minimize any damage to the aesthetic appearance of the bathroom.

The height of the second wall surface 41 may be the same as, greater than, or less than the thickness of the surface floor sheet 10, but it is preferable that the height of the second wall surface 41 be less than the thickness of the surface floor sheet 10. In other words, the drainage outlet surround member 2 is formed such that its upper surface 5 is lower than the upper surface 101 of the surface floor sheet 10. In this case, the first sealant 12 is not particularly limited, but it is preferable that its upper surface 120 is formed as an inclined surface that slopes downward from the surface floor sheet 10 toward the drainage outlet surround member 2 side (inward).

The drain outlet surround member 2 includes an upper surface 5. The upper surface 5 is a flat surface extending horizontally inward (towards the drain outlet D) from the upper edge of the second wall surface 41. In this embodiment, the planar shape of the upper surface 5 is U-shaped, and the upper surface 5 includes parallel outer edges 52 and inner edges 53 extending in an U-shape.

The width of the upper surface 5 (length in the left-right direction in Figure 25) is not particularly limited, but it is preferably 3 mm to 20 mm. Having a flat upper surface 5 of the drainage outlet surround member 2 increases its strength. Therefore, even if the drainage outlet surround member 2 is subjected to load by a user stepping on its upper surface 5, it becomes easier to maintain the shape of the drainage outlet surround member 2.

The drain surround member 2 includes an inner surface 6. The inner surface 6 is located on the drain outlet D side (inside), opposite the outer surface 4. The drain surround member 2 is installed so that the inner surface 6 is located near the drain outlet D. The inner surface 6 includes an upper third wall surface 60, a lower fourth wall surface 61, and a drain cover support surface 63 connecting the third wall surface 60 and the fourth wall surface 61.

The third wall surface 60 is a flat surface that hangs down from the inner edge 53 of the upper surface 5, that is, the edge opposite to the outer surface 4 of the upper surface 5. The third wall surface 60 faces the outer peripheral edge of the drain cover 16, which is set above the drain opening D in the drain opening surround member 2. The height of the third wall surface 60 is equal to or approximately equal to the thickness of the drain cover 16.

The drain cover support surface 63 is a flat surface extending horizontally inward (towards the drain outlet D) from the lower edge of the third wall surface 60. In this embodiment, the planar shape of the drain cover support surface 63 is U-shaped, and it comprises parallel outer edges 630 and inner edges 631 extending in an U-shape. The third wall surface 60 rises vertically from the outer edge 630 of the drain cover support surface 63. The drain cover support surface 63 supports the outer peripheral edge of the drain cover 16. The width of the drain cover support surface 63 (the length between the outer edge 630 and the inner edge 631) is not particularly limited, but is preferably 3 mm to 20 mm. The drain cover 16 is installed above the drain outlet D by being supported by the drain cover support surface 63 at its outer peripheral edge.

The fourth wall surface 61 is a flat surface that hangs down from the inner edge 631 of the drain cover support surface 63 and rises vertically from the inner edge 31 of the bottom surface 3. The height of the fourth wall surface 61 is not particularly limited, but is preferably 3 mm to 10 mm. The fourth wall surface 61 has a gap between it and the drain opening D. This gap is filled with the second sealant 13. The second sealant 13 prevents water from seeping in through the joint between the drain opening surround member 2 and the surface F of the bathroom floor. Furthermore, since the fourth wall surface 61 of the drain opening surround member 2 is covered with the second sealant 13, it prevents the drain opening surround member 2 from peeling off from the inside (drain opening D side).

The width of the second sealant 13 (maximum length in the left-right direction in Figure 25) is not particularly limited, but is preferably between 3 mm and 20 mm, and more preferably between 3 mm and 10 mm. If the width of the second sealant 13 is 3 mm or more, sufficient watertightness can be ensured. Furthermore, if the width of the second sealant 13 is 20 mm or less, workability can be improved, and the exposure of the second sealant 13 can be made less noticeable.

The second sealant 13 is not particularly limited, but it is preferable that its upper surface 130 slopes downward toward the inside (towards the drain outlet D) such that the side in contact with the inner surface 6 of the drain outlet surround member 2 is the highest and the side facing the drain outlet D is the lowest. This allows water to be smoothly guided from the drain outlet surround member 2 through the second sealant 13 to the drain outlet D.

The drain surround member 2, having the shape described above, is not particularly limited, but it is preferably made of a material that satisfies the durability required for use on bathroom floors, such as water resistance, abrasion resistance, and impact resistance, for example, metal or resin. The drain surround member 2 is integrally formed, for example, by injection molding.

The material of the drain outlet surround component 2 is not particularly limited, but a rigid resin is preferably used. Examples of rigid resins include polyvinyl chloride resin and polystyrene resin. Among these, polyvinyl chloride resin is preferred as the material for the drain outlet surround component 2 because it offers excellent processability, easy hardness adjustment, and lower manufacturing costs.

In the second embodiment of the bathroom floor structure 1, the drain channel D is located inside the bathroom floor surface D, rather than at the wall edge, and users frequently step on the drain surround member 2 installed above the drain D. Because the drain surround member 2 is made of a rigid material, it possesses high strength, thereby improving its durability.

Since the surface floor sheet, underlayment, and sealant are the same as in the first embodiment, their description will be omitted in the second embodiment.

Installation Method for Bathroom Floor in Second Embodiment Next, the installation method for the bathroom floor in the second embodiment will be described. First, if the surface F of the bathroom floor has large irregularities, cracks, etc., a base repair material is used to smooth it out as needed. If the surface F of the bathroom floor is made of ceramic tile material or fiber-reinforced plastic (FRP) panel material, for example, "Basna Putty EPO (manufactured by Toli Corporation)" can be suitably used as the base repair material.

Next, as shown in Figure 32, the drain surround member 2 is installed around the drain opening D on the surface F of the bathroom floor. The drain surround member 2 is fixed to the surface F of the bathroom floor using adhesive or double-sided tape, preferably double-sided tape.

The double-sided tape may be attached to the surface F of the bathroom floor along all four sides of the drain opening D, but it is preferable to attach it to the bottom surface 3 of the drain opening surround member 2. The same applies when using adhesive as with double-sided tape. It is preferable to install the drain opening surround member 2 at a distance of 5 mm or more from the drain opening D.

Next, as shown in Figure 33, in order to lay the subfloor material 11 on the surface F of the bathroom floor, fixing means such as adhesive or double-sided tape are provided on the surface F of the bathroom floor. From the perspective of efficiency of construction work, it is preferable to attach double-sided tape 15 to the surface F of the bathroom floor. The location on the surface F of the bathroom floor to which the double-sided tape 15 is attached is not particularly limited. The double-sided tape 15 may be attached to the entire surface F of the bathroom floor, but if at least the outer edge and opening edge 110 of the subfloor material 11 are fixed to the surface F of the bathroom floor, it is possible to suppress water from seeping between the subfloor material 11 and the surface F of the bathroom floor. For this reason, from the perspective of efficiency of construction work, the double-sided tape 15 may be attached only to a part of the surface F of the bathroom floor. Furthermore, in order to firmly fix the subfloor material 11 to the surface F of the bathroom floor, it is preferable to apply double-sided tape 15 to the surface F of the bathroom floor so that the outer edge and opening edge 110 of the subfloor material 11, as well as multiple locations inside the outer edge of the subfloor material 11, are fixed to the surface F of the bathroom floor. The same applies when using adhesive.

Next, as shown in Figure 34, the subfloor material 11 is laid on the surface F of the bathroom floor. When laying the subfloor material 11 on the surface F of the bathroom floor, the opening edge 110 of the subfloor material 11 is brought into contact with the first wall surface 40 of the outer surface 4 of the drain surround member 2. At this time, it is preferable to fix the opening edge 110 of the subfloor material 11 to the first wall surface 40 of the drain surround member 2 using adhesive or double-sided tape, preferably double-sided tape. Once the subfloor material 11 has been laid, the entire upper surface of the subfloor material 11 is pressed down using a pressure roller or the like. This firmly secures the subfloor material 11 to the surface F of the bathroom floor.

Next, as shown in Figure 35, in order to lay the surface floor sheet 10 on top of the subfloor material 11, fixing means such as adhesive or double-sided tape are provided on the upper surface of the subfloor material 11. From the perspective of efficiency of construction work, it is preferable to attach double-sided tape 15 to the upper surface of the subfloor material 11. The location on the upper surface of the subfloor material 11 to which the double-sided tape 15 is attached is not particularly limited. The double-sided tape 15 may be attached to the entire upper surface of the subfloor material 11, but if at least the outer peripheral edge and opening edge 100 of the surface floor sheet 10 are fixed to the subfloor material 11, water can be prevented from seeping between the subfloor material 11 and the surface floor sheet 10. For this reason, from the perspective of efficiency of construction work, the double-sided tape 15 may be attached only to a part of the upper surface of the subfloor material 11. Furthermore, in order to firmly fix the surface floor sheet 10 to the subfloor material 11, it is preferable to apply double-sided tape 15 to the upper surface of the subfloor material 11 so that the outer edge and opening edge 100 of the surface floor sheet 10, as well as multiple locations inside the outer edge of the surface floor sheet 10, are adhered to the subfloor material 11. The same applies when using adhesive.

Next, as shown in Figure 36, the surface floor sheet 10 is laid on top of the subfloor material 11. When laying the surface floor sheet 10 on top of the subfloor material 11, the opening edge 100 of the surface floor sheet 10 is placed on the sheet support surface 42 on the outer surface 4 of the drainage outlet surround member 2. At this time, it is preferable to fix the opening edge 100 of the surface floor sheet 10 to the sheet support surface 42 using adhesive or double-sided tape, preferably double-sided tape. A gap exists between the opening edge 100 of the surface floor sheet 10 and the second wall surface 41 on the outer surface 4 of the drainage outlet surround member 2. Once the surface floor sheet 10 is laid, the entire upper surface of the surface floor sheet 10 is pressed down using a pressure roller or the like. This firmly secures the surface floor sheet 10 to the subfloor material 11.

Next, sealing is performed using a sealant. Specifically, as shown in Figures 25 and 37, the gap between the opening edge 100 of the surface floor sheet 10 and the second wall surface 41 on the outer surface 4 of the drain surround member 2 is filled with the first sealant 12 using a caulking gun or the like. Furthermore, the space between the fourth wall surface 61 on the inner surface 6 of the drain surround member 2 and the drain D is filled with the second sealant 13 using a caulking gun or the like, covering the fourth wall surface 61 with the second sealant 13. Also, if there are gaps between the outer edges of the surface floor sheet 10 and the underlayment 11 and the bathroom wall W or bathtub, etc., the sealant is filled into these gaps using a caulking gun or the like. This prevents water from penetrating between the surface floor sheet 10 and the underlayment 11 and the surface F of the bathroom floor.

Finally, as shown in Figure 24, the drain cover 16 is placed on the drain cover support surface 63 on the inner surface 6 of the drain cover component 2.

The bathroom floor structure 1 of the second embodiment is completed by the construction method described above. The adhesives and double-sided tapes used in the above-described construction method are not particularly limited as long as they can be used to adhere the drain surround member 2 and the subfloor material 11 to the surface F of the bathroom floor, adhere the surface floor sheet 10 to the subfloor material 11, or adhere the surface floor sheet 10 and subfloor material 11 to the drain surround member 2; conventionally known adhesives and tapes can be used. It is preferable to use adhesives and double-sided tapes that have excellent adhesive strength, water resistance, substrate unevenness following ability, plasticizer resistance, creep resistance, and ease of peeling. For example, "Basna Tape (manufactured by Toli Corporation)" can be suitably used as the double-sided tape.

Operation and Effects of the Second Embodiment According to the second embodiment described above, the drainage outlet surround member 2, which is installed between the surface floor sheet 10 and the underlayment 11 laid on the surface F of the bathroom floor and the drainage outlet D formed in the bathroom floor, has an outer surface 4 adjacent to the surface floor sheet 10 and the underlayment 11, a lower first wall surface 40 facing the underlayment 11, an upper second wall surface 41 facing the surface floor sheet 10, and a sheet support surface 42 on which a portion of the surface floor sheet 10 is placed.

In the second embodiment, the outer surface 4 of the drainage outlet surround member 2 is not a straight plane extending from the lower edge to the upper edge, but a stepped surface having a sheet support surface 42 between a lower and outer first wall surface 40 facing the floor base material 11 and an upper and inner second wall surface 41 facing the surface floor sheet 10. The opening edge 100 of the surface floor sheet 10 is placed on the sheet support surface 42, and the first sealant 12 is filled into the gap between the second wall surface 41 and the opening edge 100 of the surface floor sheet 10. This allows the opening edge 100 of the surface floor sheet 10 to be fixed to the sheet support surface 42 using adhesive or double-sided tape. Even if a user steps on the surface floor sheet 10 near the drainage area member 2, causing a significant indentation in the subfloor material 11, the fixation between the surface floor sheet 10 and the drainage area member 2 can be maintained, preserving the waterproofing treatment (first sealant 12) applied between the surface floor sheet 10 and the drainage area member 2. Therefore, water penetration between the surface floor sheet 10 and the drainage area member 2 can be suppressed.

Furthermore, in the first embodiment, since the drain surround member 2 has a portion facing the subfloor material 11 and a portion facing the surface floor sheet 10, even if the subfloor material 11 is laid on the surface F of the bathroom floor together with the surface floor sheet 10, and the drain surround member 2 is installed around the drain D as a trim piece, it is possible to suppress the occurrence of a large step difference between the outermost surface floor sheet 10 and the drain surround member 2. Therefore, the risk of users tripping over the step is reduced, improving safety, and the aesthetic appeal of the bathroom is not spoiled by the presence of the step.

Furthermore, according to the second embodiment, the upper surface 5 of the drainage outlet surround member 2 is flat. The flatness of the upper surface 5 of the drainage outlet surround member 2 increases its strength. Therefore, even if a load is applied to the drainage outlet surround member 2 by a user stepping on its upper surface 5, the shape of the drainage outlet surround member 2 is more easily maintained.

Furthermore, according to the second embodiment, in the drain surround member 2, the fourth wall surface 61 of the inner surface 6 rises vertically from the inner edge 31 of the bottom surface 3. In the drain surround member 2, since the fourth wall surface 61 on the inner surface 6 closer to the drain D is a surface that rises vertically to the surface F of the bathroom floor, the fourth wall surface 61 acts as a wall when filling the space between the fourth wall surface 61 and the drain D with the second sealant 13, making it easier to apply the second sealant 13.

Modification of the Second Embodiment The second embodiment can be modified in the following ways, for example.

As shown in Figures 38 and 39, the drainage outlet surround member 2 may include a plate-like portion 9 that protrudes horizontally outward from the lower edge of the first wall surface 40 on the outer surface 4 (in other words, the lower edge of the outer surface 4) and on which a portion of the floor base material 11 can be placed. The plate-like portion 9 can be made of a single long, thin plate extending around the entire circumference of the drainage outlet surround member 2. In this embodiment, the planar shape of the plate-like portion 9 is U-shaped. The plate-like portion 9 does not necessarily have to be made of a single thin plate; it may be made of short thin plates or small pieces, and multiple plate-like portions 9 may be arranged at intervals along the circumference of the drainage outlet surround member 2.

The protruding length of the plate-like portion 9 is not particularly limited, but is preferably 0.5 mm to 50 mm. The thickness of the plate-like portion 9 is not particularly limited, but is preferably 0.1 mm to 2 mm.

The drain surround member 2 comprises one or more plate-like portions 9. For example, by attaching adhesive or double-sided tape (preferably double-sided tape) to the lower surface of the plate-like portion 9, and fixing the plate-like portion 9 to the surface F of the bathroom floor, the drain surround member 2 can be firmly fixed to the surface F of the bathroom floor. Furthermore, the opening edge 110 of the floor base material 11, which faces the first wall surface 40 of the drain surround member 2, rests on the plate-like portion 9. Therefore, by attaching adhesive or double-sided tape (preferably double-sided tape) to the upper surface of the plate-like portion 9 and adhering the opening edge 110 of the floor base material 11 to the plate-like portion 9, the floor base material 11 can be fixed to the drain surround member 2.

Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of this disclosure.

1 Bathroom floor structure 2 Drain surround component 4 Outer surface of drain surround component 5 Top surface of drain surround component 6 Inner surface of drain surround component 9 Plate-like part 10 Surface floor sheet 11 Underlayment material 12 First sealant 13 Second sealant 40 First wall surface of outer surface 41 Second wall surface of outer surface 42 Sheet support surface of outer surface 50 Flat surface of top surface 51 Inclined surface of top surface 60 Third wall surface of inner surface 61 Fourth wall surface of inner surface 63 Drain cover support surface of inner surface F Surface of bathroom floor D Drain

Claims (5)

A drainage member installed between the subfloor material and surface floor sheet laid on the surface of the bathroom floor and the drain formed in the bathroom floor, wherein the outer surface is adjacent to the surface floor sheet and the subfloor material,
The aforementioned outer surface is,
The lower first wall surface facing the aforementioned floor subfloor material,
A second wall surface located on the drain side of the first wall surface and facing the surface floor sheet,
A sheet support surface that connects the first wall surface and the second wall surface and on which the portion of the surface floor sheet facing the second wall surface can be placed,
Components for use around drain openings, including those mentioned above. The drain outlet surround member according to claim 1, wherein the upper surface connected to the upper edge of the second wall surface includes an inclined surface that slopes downward toward the drain outlet side. The inner surface on the drain side, which is located opposite the outer surface,
The upper surface connected to the upper edge of the second wall surface, and the upper third wall surface that hangs down from the edge on the inner side,
A fourth wall surface located closer to the drain outlet than the third wall surface,
The drain outlet surround member according to claim 1, comprising a drain cover support surface that connects the third wall surface and the fourth wall surface and on which a portion of a drain cover provided above the drain outlet can be placed. A drain surround member according to any one of claims 1 to 3, which is installed around the drain on the surface of the bathroom floor,
A subfloor material laid on the surface of the bathroom floor, wherein the portion facing the first wall surface is the subfloor material facing the first wall surface,
A surface floor sheet laid on the aforementioned subfloor material, wherein the portion of the surface floor sheet facing the second wall surface has a gap between it and the second wall surface,
A first sealing agent is filled into the gap,
A bathroom floor structure equipped with this feature. A step of installing the drain surround member described in any one of claims 1 to 3 around the drain on the surface of the bathroom floor,
The process of laying a subfloor material on the surface of the bathroom floor such that the portion facing the first wall surface is opposite to the first wall surface,
The steps include laying a surface floor sheet on the floor base material such that the portion facing the second wall surface has a gap with the first wall surface,
The process of filling the gap with a sealant,
A method for constructing bathroom floors, which includes [the specified feature].