JP3211691B2 - Bathroom unit floor pan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor pan for a bathroom unit.

[0002]

2. Description of the Related Art The following specifications are required for floor pans in bathroom units. The steps at the bathroom entrance are low. In order to guarantee smooth traffic between the bathroom and the dressing room, it is necessary to reduce the height of the bathroom entrance, particularly in consideration of the elderly. The height of the bathtub is low. In order to make it easy to get in and out of the bathtub, it is necessary to reduce the straddling height of the bathtub, particularly in consideration of the elderly. The appropriate height of the drain pipe connection of the drain trap from the building frame floor is secured. In order to secure a proper inclination of the drain pipe extending from the drain trap, it is necessary to secure an appropriate height of the drain pipe connection part of the drain trap from the building frame floor.

[0003] A conventional floor pan having a first part including a washing area and a second part including a bathtub placement part, and a drain trap attached to the bottom of the floor pan, and having no pits on a flat building frame floor. The following are examples of floor pans placed on a floor pan satisfying some of the above required specifications. (1) As shown in FIG. 3, the second part 2 of the floor pan is disposed below the first part 1 and the installation height from the building frame floor A is lowered, and the step H1 at the bathroom entrance and the bathtub are set. B straddling height H2
A floor pan that meets the requirements of floor pan requirements by lowering the floor pan. (2) As shown in FIG. 4, the second part 2 of the floor pan is arranged below the first part 1, and the installation height from the building frame floor A is properly secured, and the straddling height of the bathtub B is secured. The floor pan satisfying the requirements of floor pans by lowering the height H2 and properly securing the height H3 of the drain pipe connection portion 4a of the drain trap 4 from the building frame floor A. (3) As shown in FIG. 5, there is no step between the first part 1 and the second part 2 of the floor pan, and the installation height from the building frame floor A is properly secured, and the bathroom entrance Lower the step H1,
And the floor A of the building frame of the drain pipe connection part 4a of the drain trap 4
Floor pan satisfying the requirements of floor pans by properly securing the height H3 from the floor.

[0004]

The floor pan shown in FIG. 3 has a floor A of a building frame at a drain pipe connection portion 4a of a drain trap 4.
Height H3 from the floor becomes low, and the floor pan does not satisfy the required specification. In the floor pan shown in FIG. 4, the height of the first portion 1 of the floor pan is increased and the height H1 of the bathroom doorway is increased.
And the floor bread requirements are not met. The floor pan shown in FIG.
2 becomes large, and there is a problem that floor bread requirements are not satisfied. The present invention has been made in view of the above problems, and has a first portion including a washing place and a second portion including a bathtub mounting portion.
It is an object of the present invention to provide a floor pan of a bathroom unit that has a portion and is placed on a flat building frame floor without pits and that meets all of the floor pan requirements.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a second portion of a floor pan having a first portion including a washing place and a second portion including a bathtub mounting portion is provided by a first portion.
A first drain port is formed in a first portion of the floor pan, a second drain port and a third drain port are formed in a second portion of the floor pan, and the third drain port is a floor. A drain trap is formed at the bottom of the second portion of the pan, a drain trap is connected to the first drain port, and a second drain port is connected to a drain hole of a bathtub mounted on the bathtub mounting portion in a watertight manner. A portion of the drain pipe extending from the drain port extending below the second portion of the floor pan is bent upward to form a pipe trap, and a drain pipe extending from the third drain port is connected to the first drain port. A floor pan for a bathroom unit, wherein the floor pan is connected to a drain trap.

[0006] In the floor pan of the bathroom unit according to the present invention, the second part including the bathtub mounting part is replaced with the first part including the washing place part.
By disposing below the part, the straddling height of the bathtub is reduced.

In the floor pan of the bathroom unit according to the present invention, the drain trap is attached to the first portion of the floor pan, that is, a portion other than the lowermost portion of the floor pan, and the floor pan of the drain pipe extending from the second portion of the floor pan. Forming a pipe trap by bending a portion extending below the first portion upwardly to form a pipe trap, and reducing the thickness of the floor pan including the drain trap and the pipe trap, thereby forming a drain trap and a pipe trap. It is possible to reduce the height of the first part from the building frame floor and to reduce the height of the bathroom entrance while securing the appropriate height of the drainage pipe connection from the building frame floor. .

[0008] In the floor pan of the bathroom unit according to the present invention, the second drain port is connected to the drain port of the bath tub in a watertight manner, so that the hot water of the bath tub can be directly discharged from the second drain port without flowing to the second portion. Drain. By forming a first drain port in the first portion and forming a third drain port in the lowermost portion of the second portion, when a large amount of hot and cold water is discharged to the first portion, a part of the drain water is discharged to the first portion. The water is drained through a drain port, and the remaining portion flows into a second portion lower than the first portion, and then drains through a third drain port. In the floor pan of the bathroom unit according to the present invention, the hot water in the bath tub is drained directly from the second drain port without flowing to the second portion, and when a large amount of hot water is discharged to the first portion, the hot water is discharged from the first portion. By causing the lower second portion to function as a retarding pond and quickly draining the water from the first portion, it is possible to prevent a situation in which water leaks from the floor pan to the dressing room through the bathroom doorway.

In a preferred embodiment of the present invention, the height of the sealing surface of the drain trap and the height of the sealing surface of the pipe trap are substantially the same as the height of the lowermost portion of the second portion of the floor pan, and The height is set so as not to exceed the lowermost height of the second portion. The height of the sealing surface of the drain trap and the height of the sealing surface of the pipe trap are substantially the same as the height of the lowermost part of the second portion of the floor pan, and the thickness of the floor pan including the drain trap and the pipe trap is reduced. By doing so, it is possible to lower the height of the first portion from the floor of the building frame, and to reduce the step at the bathroom entrance. The height of the sealing surface of the drain trap does not exceed the height of the lowermost part of the second portion of the floor pan to prevent drainage from flowing back from the third drain to the second portion of the floor pan.

[0010] In the present invention, a second portion of the floor pan having a first portion including a washing place and a second portion including a bathtub rest is disposed below the first portion, and the first portion of the floor pan is provided. A first drain port is formed in the floor pan, a second drain port and a third drain port are formed in a second portion of the floor pan, and the third drain port is a second drain port of the floor pan.
A second drain port is formed at the bottom of the portion, and a second drain port is connected to a drain hole of a bathtub mounted on the bathtub mounting portion in a watertight state, and is below a second portion of a floor pan of a drain pipe extending from the second drain port. The portion extending in the step is bent upward to form a tube trap,
A portion extending below the second portion of the floor pan of the drain pipe extending from the drain port is bent upward to form a pipe trap,
A floor pan for a bathroom unit, wherein a drain pipe extending from the first drain port is connected to a pipe trap formed in the drain pipe extending from the third drain port.

[0011] In the floor pan of the bathroom unit according to the present invention, the second part including the bathtub mounting part is replaced with the first part including the washing place part.
By disposing below the part, the straddling height of the bathtub is reduced.

[0012] In the floor pan of the bathroom unit according to the present invention, a portion of the drain pipe extending from the second portion of the floor pan extending below the first portion of the floor pan is bent upward to form the pipe trap. By forming and reducing the thickness of the floor pan including the tube trap, the first portion from the building frame floor of the first part can be secured while securing the appropriate height of the drain pipe connection portion of the tube trap from the building frame floor. It is possible to suppress an increase in height and to reduce a step at a bathroom entrance.

[0013] In the floor pan of the bathroom unit according to the present invention, the second drain port is connected to the drain port of the bath tub in a watertight manner, so that hot water of the bath tub does not flow to the second portion and directly from the second drain port. Drain. By forming a first drain port in the first portion and forming a third drain port in the lowermost portion of the second portion, when a large amount of hot and cold water is discharged to the first portion, a part of the drain water is discharged to the first portion. The water is drained through a drain port, and the remaining portion flows into a second portion lower than the first portion, and then drains through a third drain port. In the floor pan of the bathroom unit according to the present invention, the hot water in the bath tub is drained directly from the second drain port without flowing to the second portion, and when a large amount of hot water is discharged to the first portion, the hot water is discharged from the first portion. By causing the lower second portion to function as a retarding pond and quickly draining the water from the first portion, it is possible to prevent a situation in which water leaks from the floor pan to the dressing room through the bathroom doorway.

In a preferred aspect of the present invention, the height of the sealing surface of the pipe trap formed on the drain pipe extending from the second drain port and the height of the sealing surface of the pipe trap formed on the drain pipe extending from the third drain port are described. The height is set to be substantially the same as the height of the lowermost portion of the second portion of the floor pan, and not to exceed the height of the lowermost portion of the second portion of the floor pan. The height of the sealing surface of the pipe trap formed in the drain pipe extending from the second drain port and the third level;
By making the height of the sealing surface of the pipe trap formed in the drain pipe extending from the drain port substantially the same as the height of the lowermost part of the second portion of the floor pan, by reducing the thickness of the floor pan including the pipe trap , Lowering the height of the first part from the building frame floor,
It is possible to reduce the step at the bathroom entrance. The height of the sealing surface of the pipe trap of the drain pipe extending from the third drain port,
Do not exceed the height of the bottom of the second portion of the floor pan to prevent drainage from flowing back from the third drain to the second portion of the floor pan.

[0015] In a preferred aspect of the present invention, the first drain port is formed at the center of the first portion of the floor pan in the longitudinal direction of the bathtub. The first drain port is formed at the center of the first part of the floor pan in the longitudinal direction of the bath tub, the inclination drop is reduced, and the thickness of the first part is reduced, so that the first part is separated from the building frame floor of the first part. The height of the bathroom can be reduced to reduce the height of the bathroom entrance.

[0016] In a preferred aspect of the present invention, the second drain port is closely connected to a drain hole of a bathtub mounted on the bathtub mounting portion of the second portion of the floor pan. The second drain port is connected to the drain hole of the bathtub placed on the bathtub mounting portion of the second part of the floor pan in a state of close contact, so that the second drain port is connected to the drain hole of the bathtub in a watertight state. Further, it is possible to prevent a situation in which bathtub drainage overflows into the second portion.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A floor pan in a bathroom according to a first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, a floor pan 100 of a bathroom according to the present embodiment includes a first portion 1 including a washing place.
And a second portion 2 including a bathtub mounting portion. Second
The part 2 is disposed below the first part 1. A raised bank portion 1a is formed at the boundary between the first portion 1 and the second portion 2. The top of the bank 1a is positioned lower than the top of the baseboard 1b, which is the rising portion of the periphery of the first portion 1. The first portion 1 is inclined downward from the end on the bathroom entrance side to the bank 1a. Floor bread 10
Numeral 0 is mounted on a flat building frame floor A without pits.

A first drain port 3 is formed in a portion of the first portion 1 adjacent to the bank portion 1a. An inverted bell-type drain trap 4 is connected to the first drain port 3. The drain pipe 5 is connected to the drain pipe connection part 4a of the inverted bell type drain trap 4. The drain pipe 5 extends to the side while being inclined downward. A second drain port 6 is formed in the bathtub mounting portion of the second part 2. A drain pipe 7 extends from the second drain port 6.
A portion 7a extending below the second portion 1 of the drain pipe 7 is bent upward to be convex, and a pipe trap 8 is formed by the bent portion 7a of the drain pipe 7 and a portion upstream of the bent portion 7a. I have.
A downwardly extending extension of the drain pipe 7 extends laterally from the downstream end of the bent portion 7a, that is, the drain pipe connection portion 8a of the pipe trap 8. A third drain 9 is formed at the bottom of the second portion 2. A drain pipe 10 extends from the third drain port 9. The drain pipe 10 is connected to an inverted bell type drain trap 4. The height h of the sealing surface of the inverted bell type drain trap 4 and the pipe trap 8 is set to be substantially the same as the height of the lowermost part of the second part 2, and the height of the lowermost part of the second part 2 is reduced. It is set not to exceed.

The drain hole 21 of the bathtub 200 is positioned immediately above the second drain port 6. The second drain port 6 is disposed between the second part 2 and the bathtub 200, and receives the weight of the bathtub 200 via an annular packing 12 pressed against the bottom surface of the bathtub 200 and the upper surface of the second part 2. And the drain hole 21 of the bathtub 200
Connected closely.

In the floor pan 100 of the room unit according to the present embodiment having the above-described structure, the second portion 2 including the bathtub mounting portion is disposed below the first portion 1 including the washing portion, so that the bathtub is provided. Is set low.

The floor pan 100 of the room unit according to the present embodiment.
In the above, the inverted bell type drain trap 4 is attached to the first portion 1 of the floor pan, that is, a portion other than the lowermost portion of the floor pan, and the first portion of the floor pan of the drain pipe 7 extending from the second portion 2 of the floor pan. By forming the pipe trap 8 by bending the portion 7a extending below 1 upwardly to form a pipe trap, and reducing the thickness of the floor pan including the inverted bell type drain trap 4 and the pipe trap 8, The height H3 of the drain pipe connection part 4a of the inverted bell type drain trap 4 from the building frame floor A and the height H4 of the drain pipe connection part 8a of the pipe trap 8 from the building frame floor A.
And the height of the first portion 1 from the building frame floor A is lowered, thereby making it possible to lower the step H1 at the bathroom entrance.

The floor pan 10 of the bathroom unit according to the present embodiment.
At 0, the second drain port 6 is connected to the drain hole 21 of the bathtub 200 through the annular packing 12 in a state of being in close contact with the drain hole 21 and thus in a watertight state, so that the hot water of the bathtub 200 is not directly flowed to the second portion 2. Drain from the second drain 6. By forming the first drain port 3 in the first portion 1 and forming the third drain port 9 in the lowermost portion of the second portion, when a large amount of hot water is discharged to the first portion 1, one of the hot water is discharged. Part of the first drain 3
After the remaining hot water flows over the bank 1a and flows into the second portion 2 lower than the first portion 1, the remaining water is drained through the third drain port 9. In the floor pan 100 of the bathroom unit according to the present embodiment, the hot water in the bathtub 200 is directly drained from the second drain port 6 without flowing to the second portion 2,
When a large amount of hot and cold water is discharged to the first part 1, the second part 2 lower than the first part 1 functions as a retarding pond and is quickly drained from the first part 1, so that the floor can be discharged through the bathroom entrance. The occurrence of a situation where water leaks from the pan 100 to the adjacent undressing room is prevented.

The floor pan 10 of the bathroom unit according to the present embodiment.
0, the height h of the sealing surface of the inverted bell type drain trap 4 and the pipe trap 8 is substantially the same as the height of the lowermost part of the second portion 2 of the floor pan, and the inverted bell type drain trap 4 and the pipe By reducing the thickness of the floor pan including the trap 8, the height of the first portion 1 from the building frame floor A can be reduced, and the step H <b> 1 at the bathroom entrance can be reduced. The height h of the sealing surface of the inverted bell type drain trap 4
Does not exceed the height of the lowermost part 2 of the second part of the floor pan to prevent drainage from flowing back from the drain 9 to the second part 2 of the floor pan.

A bathroom floor pan according to a second embodiment of the present invention will be described with reference to FIG. As can be seen from FIG. 2, in the present embodiment, a portion 10 a of the drain pipe 10 extending from the third drain port 9 and extending below the first portion 1 of the floor pan is bent upward to protrude, and 10 bends 10a and 10 bends
A tube trap 11 is formed by the portion upstream of a. From the downstream end of the bent portion 10a, that is, the drain pipe connection portion 11a of the pipe trap 11, an extension of the drain pipe 10 inclined downward extends to the side. The height h of the sealing surface of the pipe trap 11 is set to be substantially the same as the height of the lowermost part of the second part 2 and not to exceed the height of the lowermost part of the second part 2. . An inverted bell type drain trap is not connected to the first drain port 3. A drain pipe 13 extending from the first drain port 3 is connected to the pipe trap 11. Except for the above, the structure of the floor pan of the bathroom according to the second embodiment is the same as the structure of the floor pan of the bathroom according to the first embodiment. Also in the bathroom floor pan according to the present embodiment, the same effect as that of the bathroom floor pan according to the first embodiment can be obtained.

In the above embodiment, the first drain port 3 is desirably formed at the center of the first portion 1 of the floor pan in the longitudinal direction of the bathtub. Since the first portion 1 of the floor pan is formed with a slope toward the first drain port 3, the first drain port 3 is not formed at the end of the first portion 1 of the floor pan in the longitudinal direction of the bath tub, but is formed at the center. By forming the first part 1 in the part, the height of the first part 1 can be reduced and the height of the first part 1 from the building frame floor A can be reduced to reduce the height of the bathroom entrance. H
1 can be reduced.

In the above embodiment, the second drain port 6 is connected to the bathtub 2 via a drain pipe placed on the second portion 2 of the floor pan.
00 may be connected to the drainage hole 21 in a watertight state.

In the above embodiment, the first part 1 of the floor pan
And the second part 2 may be formed integrally, or may be formed separately and connected when placed in a bathroom. In the above embodiment, the inverted bell type drain trap 4 is
It may be formed separately from 00 and connected to the first portion 1, or may be formed integrally with the first portion 1. In the above embodiment, a part of the inverted bell type drain trap 4 may be hooked on the bank 1 a of the first portion 1. In the first embodiment, the drain trap provided in the first portion 1 of the floor pan is an inverted bell-type drain trap 4.
Is not limited to the inverted bell type.
It may be a tube trap or another type of trap. In the above embodiment, a portion of the bank portion 1a may be cut out to make it easier for the hot water to flow into the second portion 2 when a large amount of hot water is discharged to the first portion 1 of the floor pan.

[0028]

According to the floor pan of the bathroom unit according to the present invention, the second portion including the bath tub mounting portion is disposed below the first portion including the washing basin portion, so that the straddling height of the bath tub is reduced. are doing.

In the floor pan of the bathroom unit according to the present invention, the drain trap is attached to the first portion of the floor pan, that is, a portion other than the lowermost portion of the floor pan, and the floor pan of the drain pipe extending from the second portion of the floor pan. Forming a pipe trap by bending a portion extending below the first portion upwardly to form a pipe trap, and reducing the thickness of the floor pan including the drain trap and the pipe trap, thereby forming a drain trap and a pipe trap. It is possible to reduce the height of the first part from the building frame floor and to reduce the height of the bathroom entrance while securing the appropriate height of the drain pipe connection from the building frame floor. I have.

In the floor pan of the bathroom unit according to the present invention, the hot water in the bath tub is drained directly from the second drain port without flowing to the second portion, and when a large amount of hot water is discharged to the first portion, By causing the second part lower than the one part to function as a retarding basin and draining quickly from the first part, occurrence of a situation where water leaks from the floor pan to the dressing room through the bathroom doorway is prevented.

In the floor pan of the bathroom unit according to the present invention, the height of the sealing surface of the drain trap and the height of the sealing surface of the pipe trap are substantially the same as the height of the lowermost portion of the second portion of the floor pan. By reducing the thickness of the floor pan including the drain trap and the pipe trap, it is possible to reduce the height of the first portion from the building frame floor and to reduce the step at the bathroom entrance. In the floor pan of the bathroom unit according to the present invention, the height of the water sealing surface of the drain trap does not exceed the height of the lowermost portion of the second portion of the floor pan, and the drain water flows from the third drain port to the floor pan. Backflow to the second portion is prevented.

In the floor pan of the bathroom unit according to the present invention, the two drain pipes extending from the second part of the floor pan and extending below the first part of the floor pan are bent upward to bend. By forming the pipe trap and reducing the thickness of the floor pan including the pipe trap, the appropriate height of the drain pipe connection portion of the pipe trap from the building frame floor is secured, and the first part of the building frame is formed. The height increase from the floor is suppressed, and the step at the bathroom entrance can be reduced.

[0033] In the floor pan of the bathroom unit according to the present invention, the height of the sealing surface of the pipe trap formed in the two drain pipes extending from the second part of the floor pan is adjusted to the lowermost part of the second part of the floor pan. The height of the floor pan including the pipe trap is reduced to be approximately the same as the height of the floor, thereby making it possible to lower the height of the first part from the building frame floor and to reduce the step at the bathroom entrance. . In the floor pan of the bathroom unit according to the present invention, the height of the sealing surface of the pipe trap formed in the drain pipe extending from the third drain port is set so as not to exceed the height of the lowermost portion of the second portion of the floor pan. This prevents drainage from flowing back from the third drain to the second portion of the floor pan.

In the floor pan of the bathroom unit according to the present invention, the first drain port is formed at the center of the first portion of the floor pan in the longitudinal direction of the bath tub, the inclination drop is reduced, and the thickness of the first portion is reduced. By reducing the height, the height of the first portion from the floor of the building frame can be reduced, and the step at the bathroom entrance can be reduced.

In the floor pan of the bathroom unit according to the present invention, the second drain port is closely connected to the drain hole of the bathtub mounted on the bathtub mounting portion of the second part of the floor pan, The second drain port is connected to the drain hole of the bathtub in a watertight manner to prevent a situation in which bathtub drainage overflows into the second portion.

[Brief description of the drawings]

FIG. 1 is a sectional view of a floor pan of a bathroom unit according to a first embodiment of the present invention. (A) is a figure which omitted the illustration of the pipe trap formed in the drainage pipe connected to the drainage hole of the bathtub, (b) is an illustration of the inverted bell type drainage trap and the lowermost part of the second part of the floor pan It is the figure which omitted illustration of the drainage pipe which extends from.

FIG. 2 is a sectional view of a floor pan of a bathroom unit according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional bathroom unit floor pan.

FIG. 4 is a sectional view of a conventional bathroom unit floor pan.

FIG. 5 is a sectional view of a conventional bathroom unit floor pan.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st part of floor pan 2 2nd part of floor pan 3 1st drain 4 Inverted bell type drain trap 4a Drain pipe connection 5 Drain pipe 6 2nd drain 7 Drain pipe 8 Pipe trap 8a Drain pipe connection 9 3rd drainage port 10 Drainage pipe 11 Pipe trap 11a Drainage pipe connection part 12 Annular packing H1 Step of bathroom entrance H2 Crossing height of bathtub H3, H4, H5 Height of drainage connection part of drainage trap from floor of building frame h Height of the sealing surface of the drain trap 100 Floor pan of bathroom unit 200 Bathtub A Floor of building frame

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-260230 (JP, A) JP-A 4-108661 (JP, U) JP-A 57-123877 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) E03C 1/20 E03C 1/28

Claims (6)

(57) [Claims] 1. A floor pan having a second portion having a first portion including a washing area and a second portion including a bathtub mounting portion is disposed below the first portion, and the first portion of the floor pan has a first portion. A drain port is formed, a second drain port and a third drain port are formed in a second portion of the floor pan, and the third drain port is formed at a lowermost portion of the second portion of the floor pan, and is formed in the first drain port. A drain trap is connected, and a second drain port is connected in a watertight state to a drain hole of a bathtub mounted on the bathtub receiver, and extends below a second portion of a floor pan of a drain pipe extending from the second drain port. The floor pan of the bathroom unit, wherein the existing portion is bent upward to form a pipe trap, and a drain pipe extending from the third drain port is connected to a drain trap connected to the first drain port. . 2. The height of the sealing surface of the drain trap and the height of the sealing surface of the pipe trap are substantially the same as the height of the lowermost portion of the second portion of the floor pan, and the lowermost portion of the second portion of the floor pan. The floor pan of a bathroom unit according to claim 1, wherein the floor pan is set so as not to exceed the height of the floor unit. 3. A floor pan having a second portion having a first portion including a washing area and a second portion including a bathtub mounting portion is disposed below the first portion, and the first portion of the floor pan has a first portion. A drain port is formed, a second drain port and a third drain port are formed in the second portion of the floor pan, and the third drain port is formed at the bottom of the second portion of the floor pan, and the second drain port is formed. A portion extending below the second portion of the floor pan of the drain pipe of the drain pipe extending from the second drain port is connected to the drain port of the bathtub mounted on the bathtub mounting portion in a watertight manner, and is bent upward to be convex. A pipe trap is formed, and a portion of the drain pipe extending from the third drain port, which extends below the second portion of the floor pan, is bent upward to form a pipe trap, and a drain pipe extending from the first drain port. Is connected to a pipe trap formed in a drain pipe extending from the third drain port. 4. The height of the sealing surface of the pipe trap is substantially equal to the height of the lowermost part of the second portion of the floor pan, and
The floor pan of a bathroom unit according to claim 3, wherein the floor pan is set so as not to exceed a height of a lowermost part of the part. 5. The floor of a bathroom unit according to claim 1, wherein the first drain port is formed at a central portion of the first portion of the floor pan in the longitudinal direction of the bathtub. Bread. 6. The bathroom unit according to claim 1, wherein the second drain port is closely connected to a drain hole of the bathtub mounted on the bathtub mounting portion. Floor bread.