JP2003313911A - Bathroom floor pan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bathroom floor pan capable of freely adjusting the size of the bathroom floor pan in accordance with the plan of a building and forming a bathroom unit in accordance with the plan of the building. <P>SOLUTION: The bathroom floor pan A comprises a washing place floor pan 1 constituting a washing place, a bathtub mounting floor pan 2 mounting a bathtub thereon and a drain gutter floor pan 3 placed between the washing place floor pan 1 and a bathtub mounting floor pan 2 arranged in a row. The end edge part on the bathtub side of the washing place floor pan 1 and the end edge part on the washing place side of the bathtub mounting floor pan 2 respectively are overlapped on both end parts of the drain gutter floor pan 3 by making an overlapping margin variable. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement structure of bathroom floor pans in a building.

[0002]

2. Description of the Related Art Conventionally, when arranging a bathroom floor pan in a bathroom installation space of a building frame, one of a number of bathroom floor pans having a dimension that can be installed in the bathroom installation space is selected and installed in the bathroom. It is arranged in a space to form a bathroom unit. However, in such a construction method, if a bathroom floor pan that fits the size of the bathroom installation space in the building frame cannot be selected, the dead space in the bathroom installation space in the building frame becomes large, and There is a case where the bathroom unit formed in 1 must be smaller than the bathroom installation space. In particular, in recent years, the interior decoration of buildings has been vigorously carried out, but in the case of bathroom remodeling, the bathroom installation space is different at each construction site, so for the reasons mentioned above, the bathroom after remodeling will be remodeled. In many cases, the size of the bathroom is smaller than that of the previous bathroom, and it is not possible to fully meet the needs of customers.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the size of a bathroom floor pan can be freely adjusted according to the floor plan of a building, and a bathroom unit suitable for the floor plan of a building can be provided. It is an object to provide a bathroom floor pan that can be formed.

[0004]

In order to solve the above-mentioned problems, a bathroom floor pan according to the present invention comprises a floor pan 1 for a washing place constituting a washing room, a floor pan 2 for placing a bathtub on which a bathtub is placed,
Floor pan 1 for washroom and floor pan 2 for bathtub placement side by side
And a floor pan 3 for drainage which is disposed between the drainage floor pan 3 for drainage and an edge portion on the bathtub side of the floor pan 1 for washing floor and the edge portion on the washing floor for the floor pan 2 for placing bathtub. It is characterized in that the overlapping margins can be freely changed and overlapped on both ends of the. According to this, since the floor pans 3 for drainage gutters are arranged between the floor pans 1 for washing places and the floor pans 2 for placing bathtubs that are installed side by side with the stacking margin being variable, they are different for each construction site. The size of the bathroom floor pan A can be adjusted and arranged according to the floor plan of the bathroom.

The bathroom floor pan of claim 2 is the same as that of claim 1.
In the above, the lengthwise direction is the direction in which the wash floor floor pan 1, the bathtub placement floor pan 2, and the drainage floor pan 3 that are arranged in a line are the lengthwise direction, and the direction orthogonal to this lengthwise direction is the width in the top view. The floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage groove overlap each other in the case of the direction, and the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the drainage gutter Stack the vertical walls 5 standing on both width ends of the floor pan 3,
The water blocking cover material 4 is adhered to the overlapped portion, and the vertical walls 5 that overlap each other in the overlapped portion are brought into close contact with each other by the water blocking cover material 4. According to this, by the water blocking cover material 4 adhered to the overlapping portion, between the vertical walls 5 of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage groove, which overlap at the overlapping portion. Can be stopped.

Further, the bathroom floor pan of claim 3 is the same as that of claim 2
In the above, the water blocking cover member 4 is provided with a fitting groove 6 that opens downward over the entire length in the length direction, and wide-width portions 6a having a wide groove width are provided at both end portions of the fitting groove 6 in the length direction. The narrow portion 6 is formed and has a narrow groove width between the wide portions 6a.
Each vertical wall 5 of the floor pan 1 for the washing place and the floor pan 3 for the drainage groove which are formed on the wide portion 6a and are stacked, and the floor pan 2 for the bathtub placement and the floor pan 3 for the drainage groove which are overlapped with each other. And the vertical walls 5 of the drain pan floor pan 3 are fitted to the narrow portion 6b. The superposition section changes the size of the washroom floor pan 1, the bathtub placement floor pan 2 and the drainage floor pan 3 in response to the overlapping of the floor pans 3 with free overlap. In the cover material 4 for water stop for applying water stop between the vertical walls 5 of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub and the floor pan 3 for the drainage, which overlap each other, Since the wide portions 6a are formed at both ends in the longitudinal direction of the fitting groove 6 to be inserted, and the narrow portions 6b are formed between the both wide portions 6a, the water blocking cover material 4 is formed in the overlapping portion. When you put on your clothes, the floor pans for the washroom will overlap.
The vertical walls 5 of the drain pan floor pan 3 and the drain pan floor pan 3 are fitted to the one wide part 6a, and the overlapping vertical wall 5 of the bath pan 2 for the bathtub and the drain pan floor pan 3 are overlapped with the other wide part. 6a, and the vertical wall 5 of the floor pan 3 for drainage can be fitted to the narrow portion 6b, and the vertical walls 5 can be brought into close contact with each other to stop water. By changing the size, the water-stop cover material 4 does not have to be subjected to any processing in the field in accordance with the overlapped portion whose size changes. The water blocking treatment between the vertical walls 5 of the floor pan 2 and the drain pan floor pan 3 can be performed by a simple construction work such as applying the water blocking cover material 4 to the overlapping portion of the bathroom floor pan A. Of.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the embodiments shown in the accompanying drawings.

As shown in FIG. 2, a bathroom floor pan A comprises a floor pan 1 for a wash floor constituting a wash room, a floor pan 2 for placing a bathtub on which a bathtub is placed, a floor pan 1 for a wash floor and a bathtub placed side by side. It is composed of three members, a drain pan floor pan 3 that is connected to the mounting floor pan 2 to form a drain groove. Hereinafter, in describing the embodiments of the present invention, a direction connecting the bathtub placement floor pan 2 and the washing floor floor pan 1 is referred to as a length direction (FIG. 3 arrow a), and this length direction is seen in a plan view. The direction orthogonal to is referred to as the width direction (arrow b in FIG. 3) for description.

The floor pan 1 for a washing place has a substantially flat washing place floor portion 7 which constitutes the floor of the washing place, and a vertical wall 5 is erected on the peripheral portion of the washing place floor portion 7 excluding the edge on the bathtub side. Then, the base part 8 is provided on the lower surface side of the floor part 7 of the washing room, and the foot part 9 is vertically provided from the base part 8. Here, a drainage gradient is provided on the upper surface of the wash floor 7 toward the bathtub. The base portion 8 is a rigid body having an upper and lower wall thickness so as to increase the load bearing capacity of the floor pan 1 for washing, and the vertical wall 5 has a bathroom wall material placed on the upper edge thereof. The foot 9 is placed on the bathroom installation space of the building, and its vertical length can be changed to adjust the height position and the levelness of the floor pan 1 for the washroom. In addition, the washing floor 7
Protrudes toward the bathtub side from the base 8. Here, in the floor pan 1 for a washing place, a portion protruding from the base portion 8 toward the bathtub is referred to as a dimension adjusting portion for convenience. This size adjusting part is a part which overlaps with the drain pan floor pan 3 at any overlap, and the lower surface of the washing floor 7 in this size adjusting part is
A plurality of packings 10 projecting in the width direction are provided in a protruding manner, and a vertical wall 5 in the dimension adjusting portion is provided with a notch 11 which is recessed inward on the outer surface side thereof. The wall thickness of No. 5 is made thinner than the wall thickness of the vertical wall 5 of other portions.

Further, the bathtub floor pan 2 has a substantially flat bathtub mounting portion 12 on which the bathtub is mounted, and the bathtub mounting portion 1
The vertical wall 5 is erected on the peripheral portion except the edge on the side of the washing place of 2, and the base portion 8 is provided on the lower surface side of the bathtub mounting portion 12, and the foot portion 9 is hung from the base portion 8. Is configured. In addition, at the edge of the bathtub placing portion 12 on the side of the washing place, a hanging piece 13 that is continuously suspended from the bathtub placing portion 12 is provided, and a cutout portion 11 is formed on the outer surface side of the vertical wall 5. Has been done. In addition, a plurality of packings 10 extending in the width direction are provided on the rear surface of the hanging piece 13, and a drainage gradient toward the washing area is formed on the upper surface of the bathtub mounting portion 12.

Further, the drain pan floor pan 3 is provided with a recessed drain groove portion 14 which is open upward and extends in the width direction on the bathtub side, and is substantially horizontal in the washing direction from the upper end of the drain groove portion 14 on the washing place side. The flat plate portion 15 that extends to the side is provided on the washing site side, the vertical walls 5 are erected on both ends of the drainage groove portion 14 and the flat plate portion 15 in the width direction, and the base portion 8 is provided on the lower surface side of the flat plate portion 15 and It is configured by vertically extending a foot portion 9 from a base portion 8. Here, a plurality of packings 10 are provided so as to project in the width direction on the surface of the side surface of the drainage groove portion 14 on the bathtub side and the upper surface of the flat plate portion 15, respectively. In addition, the foot portion 9 of the floor pan 3 for drainage
Particularly plays a role of supporting the load applied to the overlapping portion of the bathroom floor pan A described later.

A floor pan 1 for a washing room having the above-mentioned structure,
The floor pan 2 for bathtub placement and the floor pan 3 for drainage can be arranged by placing the floor pan 3 for drainage from the bottom side between the floor pan 1 for washing floor and the floor pan 2 for bathtub placement which are arranged side by side. Form bathroom floor pan A. At this time, the floor pan for the washroom 1
The lower surface of the washing floor 7 is the flat plate portion 15 of the drain pan floor pan 3.
Is placed on top of the floor and is placed on the floor pan for bathtub 2
The back surface of the hanging piece 13 is the drain groove portion 14 of the floor pan 3 for drain groove.
Of the drain gutter floor pan 3 and the longitudinal walls 5 of the drain gutter floor pan 3 have both longitudinal end portions in the vertical direction of the wash floor floor pan 1 and the bath floor floor pan 2. The cutout portions 11 of the wall 5 are overlapped with each other. Here, the portion where the washing floor 7 of the floor pan 1 for washing and the flat plate portion 15 of the floor pan 3 for drainage overlap, and the hanging piece 13 of the floor pan 2 for bathtub placement and the drainage of the floor pan 3 for drainage. In the portion where the groove portion 14 overlaps with the side surface of the groove on the bathtub side, the packings 10 provided at the opposing portions are in close contact with each other to form a watertight structure. More specifically, in each of the packings 10 that are opposed and closely attached, one packing 10 is fitted between the other packings 10 to form a strong watertight structure. In addition, the part where the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drain groove overlap is referred to as a superposition section for convenience.

Here, in the overlapping portion of the floor pan 1 for washing area and the floor pan 3 for drainage of the bathroom floor pan A of this embodiment, the stacking margin can be freely changed in the length direction. There is. In other words, the dimension adjusting section of the washing floor 7 of the floor pan 1 for washing, which overlaps with the floor pan 3 for drain, and the flat plate portion 15 of the floor pan 3 for drain each have an appropriate length dimension in the length direction. The size adjustment part of the floor pan 1 for the washing place is overlapped with the floor pan 3 for the drain gutter by changing the stacking margin so that the size of the bathroom floor pan A in the longitudinal direction is formed. Can be set freely. Therefore, when arranging the bathroom floor pan A of this example in the bathroom installation space of the building, it can be installed according to the floor plan of the bathroom installation space in the longitudinal direction. It is possible to form a unit. This is particularly useful in the remodeling construction of a building that must be constructed in accordance with the existing floor plan of the bathroom, which differs depending on the construction site.

In the case of building remodeling,
Conventionally, it may be difficult to bring the bathroom floor pan A into the bathroom installation space, which is the construction site, through the building, but the bathroom floor pan A of this example is for the floor pan 1 for the washing place and the bathtub placement. The floor pan 2 and the drain pan floor pan 3 are composed of three members, that is, the builder has only to carry each of the downsized members into the bathroom installation space, which is a construction site. It also has an advantage that the bathroom floor pan A can be easily carried into the bathroom installation space.

Further, regarding the remodeling construction of the building, in order to prevent the construction from being complicated and the cost to rise, it is eagerly desired to continue to use the existing drainage pipe 17 or the like which is previously arranged in the building. There is a bathroom floor pan A in this example.
Is also useful in this respect. That is, in the bathroom floor pan A of this example, the drain pan floor pan 3 is replaced with the existing drain pipe 1.
The drainage hole 16 provided on the drainage floor pan 3 is communicated with the drainage pipe 17 so that the existing drainage pipe 17 is used. In addition, the arrangement of the drain pan floor pan 3 above the drain pipe 17 allows the drain pan floor pan 3 to freely change the stacking margin between the wash floor pan 1 and the bathtub mounting floor pan 2. Because they were placed on top of each other,
It can be done reliably. Also, drain pan floor pan 3
Since the drainage holes 16 are formed at arbitrary positions in the width direction on the bottom surface of the flat drainage groove portion 14, the drainage holes 16 can be easily drilled. As described above, in the bathroom floor pan A of this example, the existing drainage pipe 17 can be easily used, and sufficient measures can be taken for remodeling work.

Now, in the bathroom floor pan A of this example, the above-mentioned is in the overlapping portion except the portion where the vertical walls 5 of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage overlap. As described above, the watertight structure is formed by the packings 10. However, there is an overlapping portion where the vertical walls 5 of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage overlap each other. However, the watertight structure is formed so that the watertight structure can be formed in the entire polymerized portion. That is, in order to form a watertight structure in the overlapping portion of the washing floor floor pan 1, the bath floor floor pan 2 and the drain floor floor pan 3 where the vertical walls 5 overlap, a water blocking cover is formed in the overlapping portion. This is done by applying the material 4.

As shown in FIG. 4, the water blocking cover material 4 is
A vertical plate member formed in a shape similar to that of the vertical wall 5 of the floor pan 3 for drainage gutter, and fitting in the central portion in the thickness direction of the vertical plate member so as to open downward over the entire length in the length direction It is configured by providing the groove 6. The fitting groove 6 has wide portions 6a having wide groove widths formed at both ends in the longitudinal direction,
A narrow portion 6b having a narrow groove width is formed between the wide portions 6a. The groove width of the wide portion 6a is a portion where the vertical walls 5 of the floor pan 1 for wash floor and the floor pan 3 for drainage overlap, and the vertical walls 5 of the floor pan 2 for bathtub placement and the floor pan 3 for drainage. Is set so that the overlapping portion can be tightly fitted, and the groove width of the narrow portion 6b is set so that the vertical wall 5 of the drain pan floor pan 3 can be tightly fitted. The wide portion 6a is formed so as to have a depth from both ends in the longitudinal direction of the fitting groove 6 toward the center. More specifically, the depth dimension of the wide portion 6a is formed to be approximately the same as the maximum dimension of the stacking margin of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drain groove. ing.

The water blocking cover material 4 is provided on the vertical wall 5 of the drain pan floor pan 3 such that the lower edge portions are along the surfaces of the flat plate portion 15 and the drain groove portion 14 of the drain pan floor pan 3. The overlapped part is attached from above, and the overlapping part where the vertical walls 5 of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage groove overlap is fitted into the fitting groove 6 to form this overlapping part. The vertical walls 5 are closely contacted with each other to form a watertight structure between the vertical walls 5. The fitting of the vertical walls 5 of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage groove into the fitting groove 6 is specifically, one of the wide portions 6a of the fitting groove 6 The floor pan 1 for the washing place and the floor pan 3 for the drain groove are fitted with the overlapping portions of the vertical walls 5, and the other wide portion 6a of the fitting groove 6 is used for the floor pan 2 for placing the bath and the drain groove. It is performed by fitting the overlapping portion of each vertical wall 5 with the floor pan 3 and fitting the vertical wall 5 of the drain pan floor pan 3 to the narrow portion 6b of the fitting groove 6.

By the way, in the bathroom floor pan A of this example,
The overlapping portion of the floor pan 1 for the washing place and the floor pan 3 for the drain gutter is changed in size because it can be overlapped freely and overlapped. However, the water blocking cover material 4
In the above, the wide portion 6a of the fitting groove 6 into which the overlapping portion of each vertical wall 5 of the floor pan 1 for the washing place and the floor pan 3 for the drain groove is fitted,
Since the depth dimension in the length direction is formed to be substantially equal to the maximum size of the floor pan 1 for the washing floor and the floor pan 3 for the drainage groove in the stacking margin, the floor pan 1 for the washing floor and the floor pan 3 for the drainage groove are formed. Even when the overlapping margin is changed, the vertical walls 5 of the floor pan 1 for the washing place and the floor pan 3 for the drainage groove which overlap with each other are to be inserted up to arbitrary positions in the wide portion 6a, that is, to be securely fitted. The vertical walls 5 of the floor pan 1 for the washing floor and the floor pan 3 for the drainage groove can be fitted in the groove 6, and between the vertical walls 5 of the floor pan 1 for the washing floor and the floor pan 3 for the drainage groove. A watertight structure is surely formed. As described above, when the water blocking cover material 4 is used, a watertight structure is surely provided in the overlapping portion where the vertical walls 5 of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage drain overlap each other. It can be formed and can be treated with water stop,
When the watertight structure by each packing 10 described above is added, the watertight structure is formed in the entire overlapping portion.

By covering the bathroom floor pan A with the water blocking cover material 4 as described above, the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the drainage are arranged so as to freely overlap each other. It is possible to perform a complete waterproofing treatment between the groove floor pans 3. The use of the water blocking cover material 4 in performing the water blocking treatment between the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage groove means that the construction work for the water blocking treatment is performed. It has the advantage of being simple. That is, since the water blocking cover material 4 is provided with the fitting groove 6 having the wide portion 6a capable of accommodating the change in the overlapping margin between the vertical walls 5, the floor pan 1 for the washing room and the bathtub loading Even if the stacking margins of the floor pan 2 and the drain pan floor pan 3 are changed, the water blocking cover material 4 can be used as it is. Therefore, according to the overlapping portion whose size changes by changing the stacking margin. Since it is not necessary to apply any processing to the water-stop cover material in the field, a stop between the vertical walls 5 of the floor pan 1 for the washing place, the floor pan 2 for placing the bathtub, and the floor pan 3 for the drainage gutter. Water treatment is designed so that it can be obtained by simple construction work.

[0021]

As described above, in the invention according to claim 1 of the present invention, the floor pan for the washing place constituting the washing place, the floor pan for placing the bathtub on which the bathtub is placed, and the washing place arranged side by side. A drain pan floor pan that is arranged between the floor pan for the bath and the floor pan for placing the bathtub, and the edge part of the floor pan for the washing place on the bathtub side and the edge part of the floor pan for the bathtub on the washing place side. Since the stacking allowances were overlapped on both ends of the floor pan for drainage channels, the size of the bathroom floor pan can be adjusted and arranged according to the floor plan of the bathroom. On the other hand, the bathroom can be formed without waste.

According to the invention of claim 2, in addition to the effect of claim 1, the direction in which the floor pans for the washing place, the bath room floor pans, and the drainage floor pans arranged side by side are arranged in a line. Along with the length direction, when the direction orthogonal to this length direction in the top view is the width direction, in the overlapping section where the floor pan for the washing place and the bath pan floor pan and the drain pan floor pan overlap, Vertical walls that are erected at both width end portions of the floor pan for the washing place, the floor pan for placing the bathtub, and the floor pan for the drainage gutter are overlapped, and the water blocking cover material is attached to this overlapping part, and this water blocking is performed. Since the vertical walls that overlap in the overlapping section are adhered to each other with the cover material for water, the floor covering for the washing area, the floor pan for placing the bathtub, and the floor for the drainage groove that overlap in the overlapping section by the water blocking cover material that has been attached to the overlapping section. Water can be applied between the vertical walls of the pan, providing the water-stop function required for bathroom floor pans. It is possible to achieve the coercive.

According to the invention of claim 3, in addition to the effect of claim 2, a fitting groove that opens downward over the entire length in the lengthwise direction is provided in the water blocking cover material, A wide part with a wide groove width is formed at both ends of the fitting groove in the longitudinal direction, and a narrow part with a narrow groove width is formed between the wide parts, and the wide part is overlapped with the wide part for a washing place. Fitting the vertical walls of the floor pan and the drain pan floor pan, and the overlapping vertical walls of the bath pan and the drain pan floor pan, and fitting the drain pan floor pan in the narrow portion. Since the vertical walls of the above have been fitted together, the floor pan for washing, the floor pan for bathtub placement, and the floor pan for drainage can be overlapped with the floor pan for drainage to overlap with each other, allowing the size to change. Against this, the floor pan for the washing room, the floor pan for placing the bathtub, and the drainage that overlap with the wide part or the narrow part formed in the fitting groove of the water blocking cover material. By fitting the vertical walls of the floor pan and fitting the vertical walls to stop water, it is possible to change the stacking allowance according to the size of the overlapping section. It is not necessary to apply any processing to the water blocking cover material in the field, and the water blocking treatment is performed between the vertical walls of the floor pan for the washing room, the floor pan for placing the bathtub and the floor pan for the drain. It is possible to facilitate the construction to be performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a state in which the above members are disassembled.

FIG. 3 is a horizontal sectional view of the above.

FIG. 4A is a perspective view of a water blocking cover material,
(B) is a horizontal sectional view.

[Explanation of symbols]

1 Floor pan for washroom 2 Floor pan for bathtub placement 3 Floor pan for drainage 4 Water-stop cover material 5 vertical walls 6 Mating groove 6a wide part 6b narrow part 10 packing 13 hanging piece 14 Drain A bathroom floor pan

Claims (3)

[Claims] 1. A floor pan for a washing place that constitutes a washing room, a floor pan for placing a bathtub on which a bathtub is placed, and a drainage groove arranged between the floor pan for a washing place and the floor pan for placing a bathtub that are arranged side by side. It consists of a floor pan for washing, and the edge part on the bathtub side of the floor pan for washing place and the edge part on the washing place side of the floor pan for bathtub placement are made variable on both ends of the floor pan for drainage gutter. Bathroom floor pans that are characterized by overlapping. 2. The lengthwise direction is the direction in which the floor pans for the washing place, the bathtub flooring pan, and the drainage floor pans that are arranged in a line are aligned, and the direction orthogonal to this lengthwise direction is the width in top view. The floor pan for the washing place and the floor pan for placing the bathtub overlap with the floor pan for the drainage gutter, the width direction of the floor pan for the washing place, the bathtub placing floor pan, and the drainage floor pan The vertical walls that are erected at both ends of the are overlapped, the water blocking cover material is applied to this overlapping portion, and the overlapping vertical walls in the overlapping portion are adhered to each other with this water blocking cover material. The bathroom floor pan according to claim 1. 3. A watertight cover material is provided with a fitting groove that opens downward over the entire length in the lengthwise direction, and wide parts having a wide groove width are formed at both ends in the lengthwise direction of the fitting groove. At the same time, a narrow portion with a narrow groove width is formed between the wide portions, and the vertical walls of the floor pan for the washing room and the floor pan for the drainage groove which are overlapped with the above wide portion, and the stacked bathtub mounts. 3. The bathroom floor according to claim 2, wherein the vertical walls of the floor pan for storage and the floor pan for drainage are fitted, and the vertical wall of the floor pan for drainage is fitted in the narrow portion. Bread.