JP5252647B2 - Waterproof floor pan - Google Patents

Description

  The present invention relates to a waterproof floor pan used to form the floor of a bathroom or a shower room.

Bathroom floors and shower floors are slippery if water remains on them, and they will wet your feet during cleaning, so the water that falls on the floor is drained as quickly as possible. Therefore, the structure is required to be easily dried.
Therefore, (1) a plurality of joints having a flow gradient communicating with the drain outlet on the floor surface are arranged in a mesh shape, and each partition section partitioned by the joints has a polygonal pyramid shape or a convex shape having a curved surface. A waterproof floor pan (for example, refer to Patent Documents 1 and 2) that allows water that has fallen on the partition to flow toward the surrounding joints, and (2) a flat reference floor surface is partitioned by fine joint grooves. At the same time, there has been proposed a waterproof floor pan (for example, see Patent Document 3) in which the surface of each partition section partitioned by joints has a fine uneven shape with a surface roughness of about 1.0 to 5.0 μm.

However, the waterproof floor pans (1) and (2) have the following problems.
That is, in the waterproof floor pan of the above (1), the partition part has a convex shape, and water that has fallen on the partition part due to the inclination of the convex surface flows toward the surrounding joints, so that the drying of the entire floor surface is accelerated. However, if the area of the partition is increased, the feeling of walking tends to deteriorate. On the other hand, even if the area of the partition part is increased, if the slope of the convex surface of the partition part surface is relaxed or the curvature of the convex surface is increased, the feeling of walking will not deteriorate, but the gradient is too slow. There is a problem that the water on the partition remains on the surface of the partition due to surface tension. On the other hand, if the area of the partition portion is reduced, the above problem is solved, but there is a problem in the cleanability of the joint portion.
In the waterproof floor pan of (2) above, if the area of the partition part is not made extremely small, a pool of water will occur on the surface of the partition part. Therefore, a problem arises in the cleanability of the joint portion.

JP 2006-16843 A JP 2003-176558 A JP 2003-166269 A

  In view of the above circumstances, an object of the present invention is to provide a waterproof floor pan that is less likely to have water remaining on the floor surface, the floor surface is in a dry state in a short time, and is rich in cleanability.

  In order to achieve the above object, the waterproof floor pan according to the present invention has a reference floor surface having a slightly hydrophilic surface and a flow gradient toward a drain outlet or a drain groove. The troughs provided in a grid form have a portion of a circle having a radius of 10 mm in a plan view divided into a plurality of partition portions each having a substantially rectangular shape that is in contact with the trough portions. Has at least one protrusion that has an effect of attracting water dropped on the upper surface of the partition part and protrudes upward from the other part, and water is trapped in the valley part and the water is trapped in the valley part and the valley part. When falling in a state straddling the part, the water that has fallen on the partition part is attracted to the protrusion, while the water attracted by the protrusion is further guided to the valley part by the cohesive force of the water in the valley part and drained. It is characterized by doing so.

  Although the waterproof floor pan of the present invention is not particularly limited, a fiber-reinforced plastic molded product generally obtained by press-molding SMC (sheet mold compound) is preferable from the viewpoint of quality, durability, and cost.

In the present invention, the expression of slight hydrophilicity means that the contact angle when water is dropped on the surface of the flat plate is 65 to 85 degrees when it is made flat.
In addition, as a method for imparting the above-mentioned hydrophilicity, a method using a material that forms a waterproof floor pan with a slight hydrophilic property, a method of molding a resin with a hydrophilic treatment agent added thereto, a molded product after molding Examples thereof include a method of applying a hydrophilic coating on the surface, a method of roughening the surface of the molded product after molding, and the like.

  In the present invention, the reference floor surface has a flow gradient toward the drain outlet or the drain groove, but is not particularly limited, but preferably has a gradient of about 20/1000 to 40/1000.

In the present invention, one partition portion is surrounded by a valley portion having a pitch at which a part of a circle having a radius of 10 mm is in contact with somewhere in the valley portion in plan view. However, the reason is that if the partition portion is too large, the water on the partition portion is not attracted to the protrusion and remains on the partition portion. In consideration of the cleanability, it is preferable that the area of one partition part be at least a size (or 160 mm ² ) that protrudes from a circle having a radius of 4 mm.

  In the present invention, the effect of attracting water dropped onto the partition portion by the protrusion is the pulling force to the water caused by the protrusion (“the surface free energy by the solid material and the surface tension by the surface free energy of water attracts water It means the effect of attracting water by “surface tension” and “surface tension that induces water that increases due to solid form”).

  In addition, the protrusion has a height of 0.05 to 1.0 mm, a rising angle of the protrusion wall surface from the partition surface is 93 to 135 degrees, and a circle having a radius of 2 mm including the protrusion in plan view. It is preferable that the size of the part is always in contact with the upper surface of the partition part.

That is, if the height of the protrusion is less than 0.05 mm, a sufficient attracting effect cannot be exhibited, and if the height exceeds 1.0 mm, the sole of the foot may feel uncomfortable.
When the rising angle of the projection wall surface from the partition surface is less than 93 degrees, the attracting effect is too strong and remains on the partition surface, the projection wall surface, and the corner, and when it exceeds 135 degrees, the attracting effect is insufficient. There is a risk.
In addition, if the size of the protrusion is too large, the water attracted to the back side of the protrusion with respect to the adjacent valley portion may go around the protrusion and not be guided to the valley portion side, and may remain as it is.

Further, on one partition part, a large protrusion (hereinafter referred to as a “large protrusion”) having a maximum height of 0.1 to 1.0 mm and a small protrusion (hereinafter referred to as “large protrusion”) ( (Hereinafter referred to as “small protrusions”).
That is, the large protrusion has a high force for attracting water due to its height. However, considering the moldability such as breaking when the projection area is small, the large protrusion is naturally wide with a large projection area. On the other hand, since the small protrusion has a low height, the force for attracting water is small, but it can be produced with a small projection area, and the number of the protrusions can increase the force for attracting water.
Therefore, by combining these, it is possible to promote drainage of water and make it difficult to generate a puddle.

Further, the shape and height of the protrusion provided adjacent to the valley portion may be formed such that the bulge-induced cross-sectional area S ₁ obtained as described below is smaller than the cross-sectional area S _{2 of the} valley portion. preferable.
[Determination of the raised attracted sectional area S _1]
(1) As shown in FIG. 11, from the reference level L ₀ of the partition portion 5 portion to the height H from the reference level (reference floor level) L ₀ of the partition portion 5 portion to the highest point of the protrusion 7. An intersection point between the horizontal line L ₁ passing through the height position of 90% and the wall surface of the protrusion 7 is defined as a point a.
The reference level L ₀ is an average level of any 10 points on the surface of the partition part 5.
(2) points a a perpendicular line is drawn L ₂ from a perpendicular line L _2, and the intersection point b and the horizontal line L ₃ through 10% of the height position of a height H from the reference level L ₀ compartments 5 part To do.
(3) to the wall surface and the intersection of the protrusions 7 of the horizontal line L ₃ and the point c.
(4) A position on the horizontal line L ₃ passing from the point b to the point c and having the same distance from the point b as the distance between the horizontal line L ₁ and the horizontal line L ₃ is defined as a point d.
(5) As shown in FIG. 12, the area of the triangle acd surrounded by the points a, c, and d is defined as a bulge-induced cross-sectional area S ₁ .
[Determination of the cross-sectional area S ₂ of the valley]
(1) As shown in FIG. 11, the depth from the reference level L0 to the bottom of the valley 4 is D, and the intersection of the horizontal line L ₄ passing through a position 10% of D and one side wall of the valley Point e is the point of intersection with the other side wall.
(2) The point of intersection between the horizontal line L ₅ passing through the position of 90% of the depth D and one side wall of the valley is point g, and the point of intersection with the other side wall is point h.
(3) As shown in FIG. 13, in point e, the point f, and the area of the rectangle efhg surrounded by points h and a point g to the cross-sectional area S _2.

In the present invention, the protrusion provided adjacent to the valley portion has a shortest distance L _x to the valley portion _satisfying L _X ≦ 4 × (S ₁ ) ^0.25 in relation to the water level of 0.05 mm when water is interrupted. Preferably, it is 2 mm or less.
That is, when the shortest distance L _X with the valley is long, the protrusion cannot successfully guide the water on the partition to the valley due to the cohesive force of the water in the valley, and as a result, the water is interrupted and remains on the partition There is a risk that.

On the other hand, when a plurality of protrusions are provided on one partition, it is preferable that the distance L _Y between the protrusions satisfies L _Y ≦ 32 × (S ₁ ) ^0.27 .
That is, if the distance L _Y between the protrusions is long, the pulling force due to the protrusions does not affect the intermediate part between the protrusions, and water may be interrupted at the intermediate part and remain on the partition part.

In the present invention, the cross-sectional shape of the valley is not particularly limited as long as the water on the partition can be successfully guided to the valley by the cohesive force of the water in the valley, but the depth from the reference floor is 0.4 to It is preferable that the angle formed between the side wall surface and the bottom surface is 93 to 135 degrees with 0.8 mm and width of 0.5 to 1.0 mm.
That is, if the depth of the valley is shallower than 0.4 mm, the water that has entered the valley is interrupted and does not drain well into the drain, and if the valley is deeper than 0.8 mm, it accumulates in the valley. Dirt may be difficult to remove. If the angle between the side wall surface and the bottom surface is less than 93 degrees, it will be difficult to remove the product from the mold, and if it is removed, problems will easily occur, and if the angle is larger than 135 degrees, it will be easy to form a puddle. As a result, there is a risk that the water is likely to be interrupted. If the width of the valley portion is less than 0.5 mm, the cleaning property is deteriorated, and if it exceeds 1.0 mm, it becomes easy to form a puddle, and there is a possibility that water is likely to be interrupted.
The bottom of the valley is not particularly limited, but is preferably parallel to the flow gradient of the reference floor surface.

Furthermore, it is preferable that the area which a trough occupies is 5 to 20% of the whole floor surface.
That is, if the area occupied by the valley is less than 5% of the entire floor surface, the water on the compartment cannot be drained due to the cohesive force of the water in the valley, and if it exceeds 20%, the amount of water accumulated in the valley There is a risk of increasing the drying time.

  Moreover, each partition part has a protrusion which bulges out from the part which entered 0.05 to 1 mm partition part inside from the boundary with a trough part, and protrusion may be formed on this protrusion. Absent.

  As described above, the waterproof floor pan according to the present invention has a reference floor surface having a slight hydrophilicity on the surface and a flow gradient toward the drain outlet or the drainage groove. A portion of a circle having a radius of 10 mm in a plan view is always divided into a plurality of partition portions each having a substantially rectangular shape with a size in contact with the valley portion. It has at least one protrusion that has the effect of attracting water dropped on the upper surface of the part and protrudes upward from the other part, and the water straddles the partition part and the valley part in a state of catching water in the valley part When the water drops, the water that has fallen on the partition is attracted to the protrusions, while the water that is attracted to the protrusions is further guided to the valleys by the cohesive force of the water in the valleys and drained. did.

Therefore, among the water remaining on each partition, the water remaining in a puddle shape so as to straddle the valley is quickly drained to the drain outlet or the drain through the valley. That is, almost no water remains on the partition, and the floor can be quickly dried.
That is, on the surface of the partition part, water tends to agglomerate on the spot due to the surface tension, but since the attractive force generated by the protrusion is larger than the surface tension, the water on the surface of the partition part is Be attracted to On the other hand, since the attracting force by the protrusion is smaller than the cohesive force of the water accumulated in the valley, the water attracted around the protrusion by the attracting force of the protrusion is further attracted to the valley and drained.

  Further, since the valleys are provided in a lattice shape, the inside of the valleys can be easily cleaned only by rubbing in two directions when cleaning with a sponge or the like. That is, the floor surface can be cleaned cleanly in a short cleaning time.

It is a top view of a 1st embodiment of a waterproof floor pan concerning the present invention. It is sectional drawing of the waterproof floor pan of FIG. 1 is an enlarged view of the floor surface of the waterproof floor pan of FIG. 1, (a) is a plan view, (b) is a cross-sectional view taken along the line II of FIG. (A), and (c) is the same. It is the II-II sectional view taken on the line of figure (a). FIG. 2 is an enlarged plan view schematically illustrating a drainage mechanism of water that has fallen on the floor surface of the prevention floor pan of FIG. 1. FIG. 5 is an enlarged plan view schematically illustrating a state in which drainage proceeds from the state of FIG. 4. FIG. 6 is an enlarged plan view schematically illustrating a state in which drainage proceeds from the state of FIG. 5. It is a figure explaining 2nd Embodiment of the waterproof floor pan concerning this invention, Comprising: The figure (a) is an enlarged plan view, The figure (b) is the III-III sectional view taken on the line of the figure (a). FIG. 4C is a cross-sectional view taken along line IV-IV in FIG. It is a figure explaining 3rd Embodiment of the waterproof floor pan concerning this invention, Comprising: The figure (a) is an enlarged plan view, The figure (b) is the VV sectional view taken on the line of the figure (a). FIG. 10C is a cross-sectional view taken along line VI-VI in FIG. It is a figure explaining 4th Embodiment of the waterproof floor pan concerning this invention, Comprising: The figure (a) is an enlarged plan view, The figure (b) is the VII-VII sectional view taken on the line of the figure (a). FIG. 10C is a cross-sectional view taken along line VIII-VIII in FIG. It is the sample board | plate material used by the comparative example 1, Comprising: The figure (a) is an enlarged plan view, The figure (b) is the IX-IX sectional view taken on the line (a), The figure (c) is the figure ( It is XX sectional drawing of a). Method of measuring the raised attracted sectional area S ₁ and the cross-sectional area of the valley S ₂ is an explanatory diagram for explaining the. It is an explanatory view illustrating a raised attractant sectional area S _1. It is explanatory drawing explaining the cross-sectional area S2 of a trough part.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 to 3 show a first embodiment of a waterproof floor pan according to the present invention.

As shown in FIG. 1 and FIG. 2, when the waterproof floor pan 1a is formed into a flat plate, SMC showing a slight hydrophilicity with a water contact angle of 65 to 85 degrees is formed by hot press molding. The floor surface 2 has a rectangular shape in plan view, and is formed with a flow gradient of 20/1000 to 40/1000 toward the drain port 11 provided at the center of one long side of the rectangle. A reference floor surface 3 is provided.
As shown in FIGS. 1 and 3, the reference floor surfaces 3 are provided in a grid pattern at equal intervals in the direction orthogonal to the long side where the drainage ports 11 are provided or at equal intervals in the direction parallel to the long side. The divided valley portions 4 are divided into a large number of partitioned rectangular partitions 5.

Each partition 5 has a long side of 5 to 50 mm and a short side of 5 to 20 mm, and the long side is on the long side where the drainage port 11 of the waterproof floor pan 1a is provided. It is parallel. That is, each partition 5 has a size in which a circle with a radius of 10 mm is always applied to the valley 4. Each partition 5 has a rounded shape with a corner of 0.5 R at the long and short sides.
Each partition part 5 is provided with a protrusion 6a on the table that bulges stepwise from the reference floor surface 3 at a position 1 mm inside from the periphery.
The protrusion 6a has a height of 0.1 to 1.0 mm, and a rising angle from the reference floor 3 of 93 to 135 degrees.
In addition, a total of ten protrusions 7a protrude from the surface of the protrusion 6a at equal intervals along the four corners and along the long side.

Each protrusion 7a has a square frustum shape, and an angle formed between the side wall surface and the upper surface of the protrusion 6a is 93 to 135 degrees.
Moreover, the length of one side of the lower end of the protrusion 7a is 0.3 to 10 mm. That is, the size fits within a circle with a radius of 5 mm.

The height H of the protrusion 7a is 0.1 to 1.0 mm.
The shortest distance L _X between the protrusion 7a and the valley 4 is 2 mm or less.
The distance L _Y between the protrusion 7a and the protrusion 7a is 0.2 to 2 mm.

The valley portion 4 has a trapezoidal cross section, the depth D from the reference level L ₀ including the upper surface of the partition portion 5 is 0.4 to 0.8 mm, and the angle between the bottom and the side surface is 93 to 135 degrees. It has become.
Further, the bottom of the valley 4 is parallel to the flow gradient of the reference floor 3.

The waterproof floor pan 1a is configured as described above, and the water that has fallen on the floor surface 3 flows smoothly to the drain outlet 11 along the flow gradient of the floor surface when the flow rate is large. In particular, when the protrusion 6a is provided and there is a lot of water, a wide flow path is formed between the protrusion 6a adjacent to the upper side of the valley and the water is drained more smoothly.
Then, as the flow rate decreases, as shown in FIG. 4, it remains in the shape of a puddle W on a part of the floor surface. However, the surface tension on the projection 6a between the projection 7a and the projection 7a causes the inflow. A force (indicated by a thin line arrow) that attempts to agglomerate is exerted. On the other hand, in the vicinity of the protrusion 7a, the attractive force (indicated by a dotted arrow) by the protrusion 7a acts on the water in the water pool W. And since the attractive pulling force (indicated by the dotted line arrow) by the protrusion 7a is larger than the force (indicated by the thin line arrow) that causes the surface tension on the protrusion 6a to aggregate on the spot, the protrusion 7a and the protrusion 7a The water on the projection 6a is attracted to the nearby projection 7a.

On the other hand, cohesive force (indicated by a thick arrow) due to the water in the valley 4 acts on the water on the valley 4 and in the vicinity of the valley 4. And since the cohesive force (indicated by the thick arrow) by the water in the valley 4 is larger than the attracting force (indicated by the dotted arrow) by the protrusion 7a, the water attracted in the vicinity of the protrusion 7a is directed to the valley 4 side. Be pulled.
That is, as shown in FIGS. 4 to 6, the water pool W is gradually reduced, and there is almost no water pool on the partition portion 5. Therefore, the floor surface becomes dry in a short time.

  Further, since the valleys 4 are provided in a lattice shape, the inside of the valleys 4 can be easily cleaned only by rubbing in two directions when cleaning with a sponge or the like. Therefore, the floor surface can be cleaned cleanly in a short cleaning time.

FIG. 7 shows a second embodiment of a waterproof floor pan according to the present invention.
As shown in FIG. 7, the waterproof floor pan 1b is not provided with the protrusion 6a, and the eight large protrusions 7b having the same size and the same shape as the protrusion 7a of the waterproof floor pan 1a are directly divided into the partition portions 5. On the upper reference floor surface 3, the same pattern as the protrusions 7 a is provided, and a large number of small protrusions 7 c, which are similar to the large protrusions 7 b, are 1/10 scale on the reference floor surface 3 of the partition part 5. .Similar to the waterproof floor pan 1a except that it is projected at a pitch of 1 to 0.2 mm.

  As described above, the waterproof floor pan 1b has a small projection that can be produced with a small projection area, although the force for attracting water is small, other than providing the same large projection 7b as the projection 7a of the waterproof floor pan 1a. Since many 7c were provided, the water on the partition part 5 can be attracted more smoothly to the trough part 4 side.

FIG. 8 shows a third embodiment of a waterproof floor pan according to the present invention.
As shown in FIG. 8, this waterproof floor pan 1 c is not provided with the protrusions 6 a, each partition section 5 includes four protrusions 7 d, and the protrusion 7 d extends along the rectangular short side of the partition section 5. Except for the shape of a long substantially square frustum, it is the same as the waterproof floor pan 1a.
Since this waterproof floor pan 1c has a substantially square frustum shape with a long projection 7d, it has an advantage that the feeling of use of the bathroom chair is better than the waterproof floor pans 1a and 1b.

FIG. 9 shows a fourth embodiment of a waterproof floor pan according to the present invention.
As shown in FIG. 9, the waterproof floor pan 1 d has a protruding portion 6 b that bulges out from the reference floor surface 3 in a step shape at a position where the projection 6 b enters 1.5 mm from the periphery of the partition portion 5 to the inside. Except for the fact that four protrusions 7e having a height of 0.3 mm and having a substantially oval shape in plan view are provided on the protrusion 6b at equal intervals, the waterproof floor pan 1a is the same as the above. The waterproof floor pan 1d is difficult to slip because pressure concentrates on the protrusions.

  Hereinafter, specific examples of the present invention will be described.

Example 1
A sample plate (contact angle: 80 degrees) having the following dimensions of each part of the floor structure of the waterproof floor pan shown in FIG. 3 was hot press molded using SMC.
[Partition 5]
Longitudinal dimension: 24mm
Dimension in short direction: 9mm
[Projection 6a]
Longitudinal dimension: 21 mm
Dimension in short direction: 6mm
Height: 0.3mm
Rising angle from the reference floor: 120 degrees [Protrusion 7a]
Length of one side of the lower end: 1.5mm
Height: 0.3mm
Angle between side wall and partition 5: 120 degrees Shortest distance with valley 4: 1.5 mm
Distance between protrusion 7a and protrusion 7a: 3 mm
[Tanibe 4]
Bottom width of valley 4: 1 mm
Depth of valley 4: 0.5mm
Angle formed by the side surface of the valley 4 and the partition 5: 110 degrees

(Example 2)
The dimensions of each part are as follows.
A sample plate (contact angle: 80 degrees) having the floor structure of the waterproof floor pan shown in FIG. 3 was hot press molded using SMC.
[Division part 5]
Longitudinal dimension: 24mm
Dimension in short direction: 9mm
[Protrusion 7a]
Length of one side at the bottom: 2mm
Height: 0.3mm
Angle between side wall and partition 5: 120 degrees Shortest distance with valley 4: 2 mm
Distance between protrusion 7a and protrusion 7a: 3 mm
[Tanibe 4]
Bottom width of valley 4: 1 mm
Depth of valley 4: 0.5mm
Angle formed by the side surface of the valley 4 and the partition 5: 110 degrees

(Comparative Example 1)
As shown in FIG. 10, a sample plate material (contact angle: 80 degrees) S similar to that in Example 1 except that the protrusions 7a were not provided was hot press molded using SMC.

(Comparative Example 2)
A sample plate (contact angle: 80 degrees) having the following dimensions of each part of the floor structure of the waterproof floor pan shown in FIG. 3 was hot press molded using SMC.
[Partition 5] (size that 10mm circle does not contact the valley)
Longitudinal dimension: 25mm
Dimensions in the short direction: 25mm
[Protrusion 7a]
Length of one side at the bottom: 22mm
Height: 0.3mm
Angle between side wall and partition 5: 120 degrees Shortest distance with valley 4: 1.5 mm
Distance between protrusion 7a and protrusion 7a: 3 mm
[Tanibe 4]
Bottom width of valley 4: 1 mm
Depth of valley 4: 0.5mm
Angle formed by the side surface of the valley 4 and the partition 5: 120 degrees

  A state in which the sample plate materials (length: 100 mm × 100 mm) obtained in Examples 1 and 2 and Comparative Examples 1 and 2 are respectively inclined to a gradient of 20/1000 in a direction parallel to one short side of the partition part 5 Then, after dropping 10 ml of tap water on the surface of the sample plate with a dropper, the time until no water drops were visually observed on the compartment 5 was measured, and the results are shown in Table 1 below.

From Table 1 above, according to the waterproof floor pan of the present invention, it is well understood that the floor surface dries out in a short time even when it flows down from the compartment together with the flow in the water film state and remains slightly.
In addition, in the case of the sample plates of Comparative Examples 1 and 2, the water at the peripheral edge of the partition flowed into the valleys in substantially the same time as in Examples 1 and 2 due to the cohesive force of the water on the valley side. In the case of the sample plate, as shown in FIG. 10, the water w at the center of the compartment was torn off and remained. In the case of the sample plate of Comparative Example 2, water w remained in the central portion of the compartment although it was smaller than Comparative Example 1.

1a, 1b, 1c, 1d Waterproof floor pan 11 Drain port 3 Reference floor 4 Valley 5 Partition 6a, 6b Projection 7, 7a, 7d, 7e Projection 7b Large projection 7c Small projection W Puddle

Claims (7)

The surface shows a slight hydrophilicity and has a reference floor surface having a flow gradient toward the drain outlet or drainage groove,
This reference floor surface is divided into a plurality of partition portions each having a substantially rectangular shape with a size such that a circle with a radius of 10 mm in a plan view always comes into contact with the valley portion by valley portions provided in a lattice shape. And
This partition has at least one protrusion that has the effect of attracting water dropped on the upper surface of the partition and protrudes upward from the other part,
When water falls in a state of catching water in the valley and straddling the partition and the valley, the water that has fallen on the partition is attracted to the protrusion, while the protrusion is attracted by the protrusion. A waterproof floor pan characterized in that water is further guided to the valley by the cohesive force of water in the valley and drained.   The waterproof floor pan according to claim 1, wherein the shortest distance between the valley and the protrusion provided adjacent to the valley is 1 mm or less.   The protrusion has a height of 0.05 to 1.0 mm, the rising angle of the protrusion wall surface from the upper surface of the partition portion around the protrusion is 93 to 135 degrees, and is a circle having a radius of 2 mm including the protrusion in plan view. The waterproof floor pan according to claim 1 or 2, wherein the size of the portion is necessarily in contact with the upper surface of the partition portion.   The waterproof floor pan according to any one of claims 1 to 3, wherein the area occupied by the valley is 5 to 20% of the entire floor surface.   Each partition part has a protrusion which bulges from the part which entered 0.05 to 1 mm division part from the boundary with a trough part, and the protrusion is formed on this protrusion. Item 5. The waterproof floor pan according to any one of items 4 to 4.   Each of the partition parts includes a large protrusion having a maximum height of 0.1 to 1.0 mm and a small protrusion having a maximum height of 0.05 to 0.1 mm. Waterproof floor pan according to crab.   The valley section has a depth of 0.4 to 0.8 mm from the reference floor surface, a width of 0.5 to 1.0 mm, and a cross section in which the angle between the side wall surface and the bottom surface of the valley section is 93 to 135 degrees. The waterproof floor pan according to any one of claims 1 to 6, wherein the waterproof floor pan is formed in a shape.

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