JP7586476B2 - Drainage structure, drainage fixture, bathtub and drainage structure construction method - Google Patents

Description

This invention relates to a drainage structure, a drainage tool, a bathtub, and a method for constructing the drainage structure.

Conventionally, when providing a drain for a floor surface formed on a waterproof layer using flooring material that can penetrate water, it is known to provide a cylindrical drain that penetrates the flooring material and the waterproof layer, and to provide a flow path in the cylindrical portion for directing water that has penetrated the flooring material and accumulated on the waterproof layer through the cylindrical portion into the drain. For example, Patent Document 1 and Patent Document 2 describe related technologies.

Japanese Patent No. 3797989 (see especially paragraphs 0050, 0051 and FIG. 1) JP 2016-8380 A (see especially paragraph 0007, FIG. 8, and FIG. 12)

However, in the conventional structure described above, the tubular portion that constitutes the drain outlet is completely covered by the flooring material, and the outlet on the outside of the tubular portion of the flow path that directs water that has accumulated on the waterproof layer into the drain outlet is also covered by the flooring material. This creates the problem that it is difficult to efficiently drain the water that has accumulated on the waterproof layer.

Such problems can occur not only on the floors of buildings or rooms, but also when providing a drainage structure on the bottom of a water tank for storing water.
The object of this invention is to solve such problems and to provide a structure having a permeable layer below its bottom surface and an impermeable layer below that permeable layer, whereby water that accumulates on the impermeable layer can be efficiently drained.

The drainage structure of the present invention is a drainage structure in a structural body which has a permeable layer below its bottom surface and an impermeable layer below the permeable layer, and which comprises a tubular section which is arranged to penetrate the impermeable layer and the permeable layer, and a flow path for passing water on the impermeable layer from the outside to the inside of the tubular section, and a eave section which extends from the outer surface of the tubular section or its vicinity toward the outside of the tubular section, closer to the bottom surface than the external outlet of the flow path, and a gap is formed in the flow path between the external outlet of the tubular section and the permeable layer, and the constituent material of the permeable layer supplied from the bottom surface side is held back by the eave section .

In such a drainage structure, the permeable layer is formed by fixing a surface member forming the bottom surface to the impermeable layer with an adhesive layer, the end of the surface member facing the impermeable layer is on or near the bottom surface of the eave portion, and a joint material is provided to fill the gap between the surface member and the tubular portion on the bottom surface, and the eave portion and the surface member prevent the joint material from entering the impermeable layer side beyond the eave portion.

In addition, the drainage device of the present invention is a drainage device for a structural body which has a permeable layer below its bottom surface and an impermeable layer below the permeable layer, and is provided with a tubular portion which is arranged to penetrate between the impermeable layer and the permeable layer, and a flow path for passing water on the impermeable layer from the outside to the inside of the tubular portion, and is provided with a eave portion which is arranged on the side of the flow path closer to the bottom surface than the external outlet of the tubular portion and extends from the outer surface of the tubular portion or near it toward the outside of the tubular portion, and which prevents the constituent material of the permeable layer supplied from the bottom surface side from entering the external outlet of the flow path.
The bathtub of the present invention is a bathtub equipped with either the drainage structure or the drainage tool described above.

The construction method of the drainage structure of this invention involves, in this order, a step of fixing the drainage device to the impermeable layer, a step of adhering the surface member forming the bottom surface to the impermeable layer with an adhesive layer, and a step of filling the gap between the surface member and the tubular portion on the bottom surface by supplying a joint material into the gap from the bottom surface side.

Furthermore, each of the inventions described above can be implemented in any form, including devices, systems, methods, etc., in addition to the described forms.

According to the present invention, in a structure having a permeable layer below the bottom surface and an impermeable layer below the permeable layer, water that accumulates on the impermeable layer can be efficiently drained.

1 is a cross-sectional view showing an example of a bathtub, which is a structural body equipped with a drainage device according to an embodiment of the present invention and a drainage structure including the drainage device. 2 is an enlarged side view of the drainage tool and the drainage structure including the drainage tool shown in FIG. 1 with a bathtub portion appropriately cut away. FIG. 3 is a cross-sectional view of the drainage tool in FIG. 2 taken along a plane passing through the center of the drainage tool and parallel to the paper surface. FIG. 3 is a diagram for explaining a construction method of the drainage structure shown in FIG. 2 . FIG. FIG. 5 is a diagram for explaining a process subsequent to that shown in FIG. 4 . 3 is a side view corresponding to FIG. 2 and showing the configuration of a modified example of the drainage tool and the drainage structure including the drainage tool. FIG. FIG. 4 is a view corresponding to FIG. 2 for explaining another modified example of the drainage structure of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG.
First, an example of a bathtub, which is a structure provided with a drainage tool and a drainage structure including the drainage tool according to the first embodiment, will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view of the bathtub.
The bathtub 10 shown in Fig. 1 is a hollow rectangular parallelepiped with no upper surface, and Fig. 1 shows a cross section taken along a plane passing through the center of the drainage tool and perpendicular to the bottom surface of the bathtub, close to one side of the bathtub. However, Fig. 1 does not show a cross section of the drainage tool 100 alone, but shows a side view of the bathtub 10 with the front part of the figure removed.

The bathtub 10 is configured by attaching decorative materials to the inner and outer surfaces of a stainless steel base material 11 that defines the general shape of the bathtub 10. This base material 11 corresponds to an impermeable layer. The material of the base material 11 is not limited to stainless steel as long as it is impermeable to such an extent that the amount of water that leaks through the base material 11 is negligible.
First, on the bottom side, an adhesive layer 12 is provided on a base material 11, and a surface member 13 is placed on top of the adhesive layer 12 as a decorative material for forming the appearance of the bottom surface, and the surface member 13 is fixed to the base material 11. The adhesive layer 12 can be, for example, mortar, but is not limited to this. The material of the surface member 13 can be any material, such as natural stone, wood, or tile. The upper surface of the surface member 13 in the figure constitutes the bottom surface B of the bathtub 10.

The bathtub 10 is also provided with a drainage tool 100 that constitutes a drainage structure for draining water accumulated in the bathtub 10, and the upper end of the drainage tool 100 is generally at the same height as the bottom surface B. The surface member 13 is positioned to avoid this drainage tool 100. The gap that occurs between the surface member 13 and the upper end of the drainage tool 100 during construction is filled with a joint material 14. The joint material 14 can be, for example, mortar, but is not limited to this. A gap 15 is provided between the drainage tool 100 and the adhesive layer 12 to prevent the adhesive layer 12 from coming into contact with the drainage tool 100. The significance of the gap 15 will be described later.

The adhesive layer 12, surface member 13, and joint material 14 correspond to the water-permeable layer. One feature of this embodiment is the structure for efficiently draining water that passes through the water-permeable layer and accumulates on the base material 11, which is an impermeable layer. Therefore, this embodiment is effective when the adhesive layer 12, surface member 13, and joint material 14 are configured to be permeable to the extent that the water accumulated in the bathtub 10 passes through all or part of them and a non-negligible amount of water reaches the base material 11. The material and structure of the adhesive layer 12, surface member 13, and joint material 14 are arbitrary within that range. It is not necessary that all of them are permeable. This embodiment is effective even if permeability occurs later due to cracks caused by aging.

Next, on the side surface side, an inner surface member 21 is adhered to the inside of the base material 11 with an adhesive 22 as a decorative material for forming the appearance of the inner surface. The gap between the inner surface member 21 and the surface member 13 on the bottom surface is filled with a joint material 14.
Additionally, an outer surface member 23 is adhered to the outside of the base material 11 with an adhesive 24 as a decorative material for forming the appearance of the outer surface. On the upper end side, an edge member 25 is fixed to at least one of the base material 11, the inner surface member 21, and the outer surface member 23 with a fixing device or adhesive (not shown) as a decorative material for forming the appearance of the edge portion.

The materials, shapes, etc. of the inner surface member 21, outer surface member 23, and edge member 25 are arbitrary. They may be the same as or different from the surface member 13, and may be the same as or different from each other. Water permeability is also arbitrary. If the inner surface member 21 is water permeable, water that accumulates in the bathtub 10 will seep into the inner surface member 21, but will flow down to the position of the base material 11 and accumulate there.

The adhesives 22 and 24 may be, for example, epoxy resin, but the material may be any material and may be selected appropriately according to the characteristics of the inner surface member 21 and the outer surface member 23 .
The bathtub 10 described above is placed on the foundation 30 of a building structure or the like via a support member 31. The drainage tool 100 is connected to a drainage pipe provided in the foundation 30 or to an appropriate drainage facility that guides wastewater to the drainage pipe, but detailed illustrations are omitted.

Next, the drainage tool 100 shown in FIG. 1 and the drainage structure including the drainage tool will be described with reference to FIG. 2 and FIG. 3. FIG. 2 is an enlarged side view of the drainage tool 100 and the drainage structure. FIG. 3 is a cross-sectional view of the drainage tool 100 in FIG. 2, taken along a plane that passes through its center and is parallel to the paper. In FIG. 2 and FIG. 3, the structure of the bathtub 10 around the drainage tool 100 is shown as a cross-section taken along the same plane as the cross-section of the drainage tool 100 in FIG. 3. That is, in FIG. 2, the side of the drainage tool 100 is shown, but the cross-sections of the various parts of the bathtub 10 around it are shown.

The drainage tool 100 shown in Figures 2 and 3 includes an inner cylinder 110, an outer cylinder 120, a ring member 130, and a nut 140. Here, it is assumed that the cross-sectional shape of all of these members parallel to the bottom surface B is circular. However, the cross-sectional shape is not limited to this, and may be a regular polygonal shape or another asymmetric shape. It is not necessary for the cross-sectional shapes of the outer surface and inner surface of each member to be similar to each other.
The material of the inner cylinder 110, the outer cylinder 120 and the nut 140 is stainless steel, which is impermeable and does not deteriorate easily. However, the ring member 130 is made of polyvinyl chloride, which is a low-cost resin, because the ring member 130 requires less durability than the other parts. However, the materials of the parts are not limited to these.

Of the above-mentioned parts, the inner cylinder 110 is a cylindrical part that is housed inside the outer cylinder 120, and has a flange part 111 at its upper end. The inner cylinder 110 is movable in the axial direction relative to the outer cylinder 120 by a thread groove (not shown), and after the outer cylinder 120 is fixed to the base material 11, it is preferable to adjust the height of the inner cylinder 110 so that the upper surface of the flange part 111 is slightly lower than the bottom surface B.
This allows water that accumulates on the bottom surface B inside the bathtub 10, i.e., water that the user feels as if it has "accumulated inside the bathtub 10," to be drained outside the bathtub 10 through the inner cylinder 110 and the outer cylinder 120. Of course, the bathtub 10 may be provided with an openable and closable stopper to prevent water from being drained while it is in use.

The outer cylinder 120 accommodates the lower end of the inner cylinder 110 therein, and is fixed to the base material 11 by a nut 140 via seal rings 151, 152. The outer cylinder 120 has a flange 122 disposed in the vicinity of the base material 11, and a waterproof seal ring 151 is attached between the flange 122 and the base material 11. A thread groove (not shown) is cut on the outer surface of a lower tube portion 123 disposed below the base material 11.
The lower pipe portion 123 is passed through a drainage opening that has been opened in advance in the base material 11, a waterproof seal ring 152 is attached from the underside of the base material 11, and the nut 140 is then tightened, whereby the outer tube 120 can be tightened and fixed to the base material 11 with the seal ring 152 sandwiched between the flange portion 141 of the nut 140 and the base material 11.

The outer cylinder 120 also has multiple (here, eight evenly spaced around the circumference) through holes 121 on the side surface 124 that is located above the base material 11 (closer to the bottom surface B). These through holes 121 function as flow paths for passing water that has accumulated on the base material 11 from the outside to the inside of the outer cylinder 120. The area near the drainage opening of the base material 11 is lower than the surrounding area by a step 16, so that water that has accumulated on the base material 11 collects near the drainage device 100. The collected water is guided through the through holes 121 into the inside of the outer cylinder 120, and can then be drained via the same route as the water that has accumulated on the bottom surface B.

In this example, the through hole 121 is formed directly above the flange 122 so as to be as low as possible without affecting the waterproof structure between the outer tube 120 and the base material 11. Note that although the through hole 121 is circular here, this is not essential and it may be of any shape. The number and size are also arbitrary.

The ring member 130 is fitted to the outside of the outer tube 120. However, it does not need to be in close contact with the outer tube 120 or fixed to the outer tube 120, and as described below, some play is acceptable as long as it does not interfere with preventing the intrusion of the joint material 14. Since providing play makes construction easier, in this example, a degree of play is provided that allows the ring member 130 to rotate freely around the outer tube 120.

The lower end of the ring member 130 rests on the flange 122 of the outer tube 120. The lower end of the ring member 130 is provided with cutouts 131 at intervals corresponding to the through holes 121 of the outer tube 120, and in the same number as the through holes 121. The cutouts 131 are provided to allow water to pass through so that the ring member 130 does not prevent water from flowing into the through holes 121. The lower ends of the cutouts 131 are closed by the flange 122, so the cutouts 131 essentially function as through holes. In this example, the cutouts 131 are slightly larger than the through holes 121 and are provided so that they are open at the bottom, but the size and shape are arbitrary. Of course, equivalent through holes may be provided instead of the cutouts 131.

It is not essential that the number of cutouts 131 is the same as the number of through holes 121. In this example, as shown in FIG. 3 and FIG. 4 described later, the ring member 130 is formed such that the portion that is placed on the upper side during construction is a thick-walled portion 133, and the portion that is placed on the lower side and in which the cutouts 131 are provided is a thin-walled portion 132. In this way, a water flow path along the circumferential direction can be secured between the inner circumference of the ring member 130 and the outer circumference of the outer tube 120 on the lower side, while there is almost no gap between the link member 130 and the outer tube 120 on the upper side. Therefore, even if water cannot necessarily flow in a straight line from the cutouts 131 to the through holes 121, there is no significant impediment to drainage. However, it is preferable to secure a straight flow path, and in the examples of FIG. 2 and FIG. 3, the ring member 130 is arranged in such a direction.

The above-mentioned ring member 130 has its upper surface (the surface located on the bottom surface B side) functioning as an eave extending from near the outer surface of the outer tube 120 toward the outside of the outer tube 120, blocking the joint material 14 supplied from the bottom surface B side during construction of the bathtub 10, and is provided to prevent the joint material 14 from flowing into the external outlet of the outer tube 120 of the through hole 121 and blocking the external outlet. In other words, the upper surface of the ring member 130 corresponds to the eave portion.

Next, the relationship between the above-described drainage tool 100 and each of its peripheral parts, and the construction method of the drainage structure including the drainage tool 100 will be described with reference to Fig. 4 and Fig. 5. Fig. 4 is a diagram for explaining the construction method of the drainage structure shown in Fig. 2. Fig. 5 is a diagram for explaining the subsequent steps of Fig. 4. The above-mentioned Fig. 2 corresponds to a state in which a subsequent step has been carried out from the state of Fig. 5.
When constructing a drainage structure including a drainage device 100 in a bathtub 10, after installing the base material 11 on the foundation 30, and before placing the adhesive layer 12 and the surface member 13 at least near the drain outlet, the outer tube 120 of the drainage device 100 is fixed to the drainage opening provided in the base material 11 as described above.

Next, as shown in FIG. 4, the ring member 130 is fitted into the outer cylinder 120 from above, and the inner cylinder 110 is further inserted into the inside of the outer cylinder 120 from above.
Thereafter, as shown in FIG. 5 , an adhesive layer 12 is formed on the base material 11 around the periphery of the drainage tool 100 , and a surface member 13 is placed thereon, and the surface member 13 is adhered to the base material 11 by the adhesive layer 12 .

At this time, the adhesive layer 12 is not provided right up to the ring member 130, but a certain gap 15 is provided between the side of the ring member 130. In the example of FIG. 5, the adhesive layer 12 is provided up to the position of the step 16, but the end of the adhesive layer 12 does not need to be aligned with the position of the step 16. In any case, the adhesive layer 12 is not provided near the external exit of the cutout portion 131 of the ring member 130, and therefore near the external exit of the through hole 121 of the outer tube 120.

The surface member 13 is arranged so that the end on the drainage tool 100 side is on the top surface (the surface on the bottom surface B side) of the ring member 130. For this reason, the height of the ring member 130 should be set to a size that allows the end of the surface member 13 on the base material 11 side to just contact the top surface of the ring member 130, taking into consideration the dimensions of each part such as the step 16 and the flange 122, the thickness of the adhesive layer 12, etc. However, since it is not preferable for the bottom surface B to be higher than other positions near the drainage tool 100, as this would hinder drainage through the inner tube 110, the height of the ring member 130 is set slightly lower than the height calculated to allow for dimensional errors, and therefore a slight gap may be created between the ring member 130 and the surface member 13.

Furthermore, the gap may be in the left-right direction as well as the up-down direction in Fig. 5. In other words, the end of the surface member 13 may be in the vicinity of the upper surface of the ring member 130. As will be described later, a small gap is not a problem as long as the joint material 14 does not leak in large quantities from the gap.
Since the ring member 130 is detachable from the outer cylinder 120, if a plurality of ring members 130 of different heights are prepared, it is easy to adjust the height as described above by replacing the ring members 130 at the construction site.

From the state shown in FIG. 5, the gap formed between the surface member 13 and the flange portion 111 of the inner tube 110 is filled with the joint material 14 from above to close the gap, completing the drainage structure including the drainage device 100. The joint material 14 only needs to be filled to the extent that it can close the gap on the bottom surface B, and as shown in FIG. 2, a gap may remain below the bottom surface B.

Here, the joint material 14 is held back by the top surface of the ring member 130, so unless an excessive amount is supplied, it will not flow below the top surface of the ring member 130 and will not drip down to the external outlet of the through hole 121 of the outer tube 120 and block it. The play between the outer tube 120 and the ring member 130 should be such that the joint material 14 does not drip down to the through hole 121 through the gap between the outer tube 120 and the ring member 130. In general, the fluidity of the joint material 14 is not very high, so some gap is acceptable. However, if a joint material 14 with high fluidity is used, the play must be reduced accordingly.

This makes it possible to secure a gap between the external outlet of the through hole 121 and the water permeable layer. In other words, it is possible to prevent not only the adhesive layer 12 but also the joint material 14 from being formed at the external outlet of the through hole 121. Of course, the surface member 13 is also not formed.
Although the adhesive layer 12, the surface member 13, and the joint material 14 are permeable, if these permeable layer components are present at the external outlet of the through hole 121 or inside the through hole 121, the amount of water that can flow into the through hole 121 is reduced. Therefore, the drainage efficiency of the water accumulated on the base material 11 is reduced.

On the other hand, if there is nothing at the external exit of the through hole 121 or inside it, the water that has flowed and collected on the base material 11 while passing through the permeable layer from all around the drainage device 100 can be efficiently drained by flowing into the through hole 121. When using a highly permeable material for the surface member 13 with an emphasis on decorativeness, it is conceivable that a large amount of water will accumulate on the base material 11, so it is important to efficiently drain the water on the base material 11 in this way.

If the water permeability of the surface member 13 is significantly higher than that of the adhesive layer 12, it is possible that the water that has permeated the surface member 13 will accumulate on the adhesive layer 12. However, if the water that has accumulated on the adhesive layer 12 flows into the gap 15, it will merge with the water on the substrate 11, and the two can be discharged together through the through hole 121.

Incidentally, there is no major problem even if the joint material 14 is not completely stopped by the top surface of the ring member 130 and hangs down a little on the side. This is because the possibility of reaching the through hole 121 is thought to be very low when going around the ring member 130, compared to a path that hangs down along the outer surface of the outer tube 120. In particular, since the ring member 130 has a side wall, the joint material 14 cannot reach the through hole 121 unless it hangs down the side wall and then passes through the cutout portion 131. Unless a large amount of joint material 14 is supplied, it is unlikely that it will reach the through hole 121 via this path.

Even if some of the cutouts 131 on the side of the ring member 130 end up being blocked, there are multiple cutouts 131, and each one is larger than the through-hole 121, so there is no significant impediment to the flow of water into the through-hole 121. It is sufficient that the through-hole 121 is not directly blocked.

In addition, as described above, if the end of the surface member 13 is located on or near the upper surface of the ring member 130, the joint material 14 that tries to flow down from the end of the upper surface of the ring member 130 toward the base material 11 can be blocked by the surface member 13. This further reduces the possibility that the external exit of the through hole 121 will be blocked.
It is most preferable that the surface member 13 completely blocks the joint material 14 and prevents the joint material 14 from running around the upper surface of the ring member 130 and dripping below the upper surface. However, even if there is a small gap between the surface member 13 and the ring member 130, this does not pose a major problem as long as a large amount of the joint material 14 does not leak out of the gap and reach the through hole 121.

Also, if the end of the surface member 13 is in contact with the upper surface of the ring member 130, the surface member 13 can be supported by the ring member 130. Since the portion with the gap 15 does not have the adhesive layer 12 supporting the surface member 13 and has a fragile structure compared to other portions, it is useful to reinforce it with the support of the ring member 130.

This concludes the explanation of the embodiment, but in this invention, the specific configuration of the drainage device and drainage structure, the specific procedure for installation, the specific shape, material, size, etc. of each part are not limited to those described in the embodiment.

For example, in the above-described embodiment, the ring member 130 is provided as a eaves portion for blocking the joint material 14, but the eaves portion may be provided directly on the outer cylinder 120.
Fig. 6 is a side view showing an example of the configuration of the drainage tool 100 when this modification is adopted, and corresponds to Fig. 2. In Fig. 6, the same reference numerals are used for the configurations corresponding to those in Fig. 2.

In the example of FIG. 6, a brim-shaped eaves portion 125 extending outward from the outer surface of the outer tube 120 is provided around the entire upper end of the outer tube 120. This eaves portion 125 can function in the same way as the upper surface of the ring member 130 in FIG. 2 to block the joint material 14. The position at which the eaves portion 125 is provided is not limited to the upper end of the outer tube 120, and can be provided at any position above the through hole 121 (bottom surface B side). In addition, the direction in which the eaves portion 125 extends does not need to be perpendicular to the central axis direction of the outer tube 120, and it may be inclined upward or downward. The upper surface of the eaves portion 125 may not be flat, but may be curved or have a crease. Instead of blocking the joint material 14, it may be dropped outward so that the joint material 14 does not reach the through hole 121. The same applies to the position and configuration of the upper surface of the ring member 130.

As another modification, when a ring member 130 is used, the gap 15 may not be provided, and the adhesive layer 12 may be provided up to a position where it contacts the ring member 130 .
Fig. 7 is a diagram showing an example of the configuration of the drainage structure when this modification is adopted, and corresponds to Fig. 2. In Fig. 7, the same reference numerals are used for the configurations corresponding to Fig. 2.

In the above embodiment, an example in which the water-permeable layer is composed of the adhesive layer 12, the surface member 13, and the joint material 14 has been described, but it is not essential that the water-permeable layer is composed of these elements. The water-permeable layer may be a layer of a single material, or may further include other components.
In the above embodiment, an example was described in which the tubular portion of the drainage tool 100 was divided into the inner tube 110 and the outer tube 120, but this is not essential, and a structure in which an integrated tubular portion penetrates the water-permeable layer and the water-impermeable layer may also be used. Conversely, the tubular portion may be divided into three or more parts. Also, the tubular portion may have a bent portion.

In the above embodiment, the flow path for passing water accumulated on the impermeable layer from the outside to the inside of the tubular portion of the drainage tool 100 is an example of a through hole 121, but this is not essential. The flow path may be formed in a shape other than a through hole, and the shape and structure are arbitrary. For example, it may be a tube with a bent portion, or may be formed as a gap between members forming the tubular portion.

In the above embodiment, the present invention has been described as being applied to the drainage of a bathtub, but the same drainage tool, drainage structure, and construction method thereof can be applied to any structure having a permeable layer under the bottom surface and an impermeable layer under the permeable layer. Such a structure may be, for example, a room in a building, such as a bathroom. It may also be applied to an artificial pond or pool. It may also be applied to a structure that is not intended to store water, such as the roof of a building. In any case, the above embodiment can be applied by regarding the vertically lower surface as the bottom surface.
The features of the above-described embodiments and modifications may be combined to the extent that they are not inconsistent. Also, it is possible to implement the invention by extracting only some of the features.

10...bathtub, 11...base material, 12...adhesive layer, 13...surface member, 14...joint material, 15...gap, 16...step, 21...inner surface member, 22...adhesive, 23...outer surface member, 24...adhesive, 25...edge member, 30...foundation, 31...support member, 100...drainage tool, 110...inner tube, 111...flange of outer tube, 120...outer tube, 121...through hole, 122...flange of outer tube, 123...lower tube, 124...side of outer tube, 125...eaves, 130...ring member, 131...cutout, 132...thin wall portion, 133...thick wall portion, 140...nut, 141...flange of nut, 151, 152...seal ring, B...bottom surface

Claims (5)

A drainage structure in a structure having a permeable layer under a bottom surface and an impermeable layer under the permeable layer,
A cylindrical portion provided to penetrate the impermeable layer and the permeable layer;
a flow path for passing water on the impermeable layer from the outside to the inside of the cylindrical portion;
a visor portion extending from an outer surface of the cylindrical portion or a vicinity thereof toward the outside of the cylindrical portion, the visor portion being disposed on a side closer to the bottom surface than the external outlet of the flow path;
A gap is formed between the outlet of the flow path on the external side of the cylindrical portion and the water permeable layer ,
A drainage structure characterized in that the constituent material of the permeable layer supplied from the bottom side is blocked by the eave portion . The drainage structure according to claim 1 ,
the water-permeable layer is formed by adhering a surface member forming the bottom surface to the water-impermeable layer by an adhesive layer,
an end portion of a surface of the surface member facing the impermeable layer is located on or in the vicinity of the bottom surface of the eave portion;
a joint material that fills a gap between the surface member and the cylindrical portion on the bottom surface,
A drainage structure characterized in that the eave portion and the surface member prevent the joint material from entering the impermeable layer side beyond the eave portion. A drainage device for a structure having a permeable layer under a bottom surface and an impermeable layer under the permeable layer,
A cylindrical portion disposed to penetrate the impermeable layer and the permeable layer;
a flow path for passing water on the impermeable layer from the outside to the inside of the cylindrical portion;
A drainage device characterized in that the flow path is located closer to the bottom surface than the external outlet of the tubular portion, extends from the outer surface of the tubular portion or its vicinity toward the outside of the tubular portion, and has a eave portion for preventing the constituent material of the water permeable layer supplied from the bottom surface side from entering the external outlet of the flow path. A bathtub equipped with the drainage structure according to claim 1 or 2 or the drainage tool according to claim 3 . A step of fixing the drainage tool according to claim 3 to the impermeable layer;
a step of adhering a surface member forming the bottom surface to the impermeable layer by an adhesive layer;
A step of filling a gap between the surface member and the tubular portion on the bottom surface by supplying a joint material to the gap from the bottom surface side,
A construction method for a drainage structure, characterized by carrying out the steps in the above order.

Images