JP7344691B2 - drainage structure - Google Patents

Description

The present invention relates to a drainage structure.

A structure has been disclosed in which a water trap is provided in a waterproof pan used in a place where plumbing equipment such as a washing machine is installed (see Patent Document 1). In this structure, the hose from the plumbing equipment is connected to the water-tight container of the drain trap (first flow path). Moreover, in preparation for the case where this hose is torn, a second flow path is provided separately from the first flow path that penetrates through the lid and communicates with the water-sealing container.

JP 2019-44522 Publication

However, in the siphon drainage system, even if wastewater flows into such a second flow path, the force to push the wastewater from the drain trap to the horizontal pipe is weak because the water head is low. On the other hand, it takes a certain amount of time for the siphon force to start occurring in the horizontal draw pipe, and until then, much of the wastewater does not flow. For these reasons, there was a risk that air would accumulate in the flow path and the waste water that did not completely enter the second flow path would overflow onto the waterproof pan. One possible solution to this problem is to raise the water head, but simply increasing the water head requires a larger space under the floor in the height direction.

An object of the present invention is to suppress the height of the drain trap while allowing the drain water that has passed through the water seal of the drain trap to flow smoothly to the siphon drain pipe.

The drainage structure according to the first aspect includes a drainage trap that is configured to be able to store sealed water and whose upper part is inserted into a penetration part provided in a plate-like member, and a drainage trap downstream of the sealed water of the drainage trap. a siphon drain pipe connected to the side, and a ventilation pipe connected to a position downstream of the water seal of the drain trap, above the siphon drain pipe, and including the upper part of the drain trap. have

In this drainage structure, the upper part of the drainage trap is inserted into a through-hole provided in the plate member, and the ventilation pipe is connected to a position that includes the upper part. Thereby, the ventilation pipe can be connected to a higher position of the drain trap while suppressing interference between the ventilation pipe and the plate member. Moreover, since the vertical distance between the vent pipe and the siphon drain pipe is increased, the connection position between the drain trap and the vent pipe is prevented from being blocked by the waste water that has passed through the water seal. Therefore, air downstream of the water seal in the drain trap flows to the ventilation pipe, and the air is prevented from staying in the drain trap. Furthermore, as the vertical distance between the ventilation pipe and the siphon drain pipe increases, the water head also increases, making it easier for the waste water that has passed through the water seal to flow smoothly to the siphon drain pipe.

In a second aspect, in the drainage structure according to the first aspect, the drainage trap is arranged inside an outer basket, an outer basket to which the siphon drain pipe and the ventilation pipe are connected, and can store the sealed water. The siphon drain pipe has an inner basket, and an inner cylinder disposed inside the inner basket to form the water seal, and the lower end of the inner circumferential surface of the siphon drain pipe is located at the level of the bottom of the outer basket.

In this drainage structure, the height of the drainage trap can be further suppressed by aligning the lower end of the inner peripheral surface of the siphon drainage pipe with the height of the bottom of the outer basket.

In a third aspect, in the drainage structure according to the first aspect or the second aspect, the ventilation pipe and the siphon drainage pipe are connected by a communicating pipe.

In this drainage structure, even when waste water flows into the vent pipe, the waste water is discharged to the siphon drain pipe through the communication pipe. Therefore, water can be drained from the ventilation pipe.

A fourth aspect is the drainage structure according to the third aspect, in which air inside the communication tube passes in both directions between the ventilation tube and the siphon drainage tube, and from the ventilation tube to the siphon drainage tube. A float valve is provided that allows waste water to pass to the siphon drain pipe and prevents waste water from passing from the siphon drain pipe to the vent pipe.

In this drainage structure, a float valve is provided inside the communication pipe, so that air can be discharged from the siphon drain pipe to the ventilation pipe through the communication pipe, and from the siphon drainage pipe through the communication pipe to the ventilation pipe. The inflow of wastewater can be suppressed.

In a fifth aspect, in the drainage structure according to the third aspect or the fourth aspect, the ventilation pipe has a boundary between a portion extending downward from a connection portion between the ventilation pipe and the drainage trap and a portion extending upward again. and the communication pipe is connected to the lower part of the ventilation pipe.

In this drainage structure, the communication pipe is connected to the lower part of the vent pipe, so even if waste water flows into the vent pipe, the waste water is easily discharged through the communication pipe to the siphon drain pipe. Therefore, water can be efficiently drained from the vent pipe.

A sixth aspect is the drainage structure according to the fifth aspect, in which the plate member is a flooring material, a waterproof pan is provided on the flooring material, and the drain trap is connected to the waterproof pan, In a top view, the low portion of the ventilation pipe overlaps with the penetration portion.

In this drainage structure, the drainage trap is connected to the waterproof pan, and when viewed from above, the low part of the ventilation pipe overlaps with the penetration part of the flooring, so the communication pipe connected to the low part is located near the drainage trap. Located in Therefore, it is possible to easily clean the communication pipe, which tends to be contaminated, from the drain trap side.

According to the drainage structure according to the present invention, it is possible to suppress the height of the drainage trap and allow the drainage that has passed through the water seal of the drainage trap to flow smoothly to the siphon drainage pipe.

It is a sectional view showing the drainage structure concerning a 1st embodiment. It is a sectional view showing a float valve inside a communication pipe. It is a sectional view showing the drainage structure concerning a 2nd embodiment. It is a sectional view showing the drainage structure concerning a reference example. It is a sectional view showing an internal structure of a drainage trap in a reference example. FIG. 3 is a perspective sectional view showing the internal structure of the outer basket. FIG. 3 is a perspective sectional view showing the internal structure of the outer basket. FIG. 3 is a perspective sectional view showing a state in which the wall forming member is removed from the outer basket. It is a perspective view showing a wall forming member. It is a perspective view showing a wall forming member seen from another direction. FIG. 7 is a cross-sectional view showing a reference example in which the ventilation path is not opened downward.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on drawing.

[First embodiment]
In FIG. 1, a drainage structure 10 according to the present embodiment includes a drainage trap 12, a horizontal draw pipe 14 as an example of a siphon drainage pipe, and a ventilation pipe 16.

Above the floor slab 18 of the building 17, a floor material 22, which is an example of a plate-like member, is provided horizontally. An underfloor space 24 is provided between the floor material 22 and the floor slab 18. A waterproof pan 26 is provided on the flooring 22. On the waterproof pan 26, water-related equipment such as a washing machine (not shown) is installed. The plumbing equipment and the drain trap 12 are connected by a hose 28. By using the waterproof pan 26, even if the hose 28 is torn and drainage water leaks, the waterproof pan 26 can catch the drainage water and allow it to flow into the drainage trap 12. A penetration portion 32 is formed in the floor material 22. The drain trap 12 is connected to the waterproof pan 26 through this penetration portion 32.

The drain trap 12 is configured to be able to store sealed water 34, and is installed with an upper portion 41A inserted into a penetration portion 32 provided in the flooring material 22. Specifically, the drain trap 12 has an outer basket 41, an inner basket 42, and an inner cylinder 43. The upper portion 41A is a portion of the drain trap 12 that is located at a position that overlaps the floor material 22 in the horizontal direction when the upper end of the drain trap 12 is connected to the waterproof pan 26.

The outer basket 41 is the outermost container of the drain trap 12 to which the horizontal draw pipe 14 and the ventilation pipe 16 are connected. The upper part 41A of the outer basket 41 is inserted into the penetration part 32 of the floor material 22. The outer basket 41 is in contact with the lower surface of the waterproof pan 26. An annular attachment member 36 is arranged on the upper surface side of the waterproof pan 26. A packing 38 is provided between the attachment member 36 and the waterproof pan 26. The mounting member 36 can be screwed into the threaded portion 41B of the outer cage 41 (see FIGS. 6 to 8), and by threading the mounting member 36 into the threaded portion 41B of the outer cage 41, the packing 38 and the outer cage 41 can be screwed together. A waterproof pan 26 is sandwiched between the two in a watertight manner. Thereby, the outer basket 41 is fixed to the lower surface of the waterproof pan 26.

The inner basket 42 is a container arranged inside the outer basket 41 and capable of storing the sealed water 34. A drainage window 42A that defines the upper limit of the water level of the water seal 34 is formed through the outer peripheral surface of the inner basket 42. The inner basket 42 can be freely attached to and removed from the inside of the outer basket 41 from the waterproof pan 26 side through an opening (not shown) of the open drainage trap 12.

The inner cylinder 43 is a cylindrical member that is disposed inside the inner basket 42 and forms a water seal 34. This inner cylinder 43 can be attached to and removed from the inside of the inner basket 42 from the waterproof pan 26 side through an opening (not shown) of the drain trap 12 that opens to the waterproof pan 26 . In the drain trap 12, the waste water from the plumbing equipment flows into the inner cylinder 43 and mixes with the water seal 34, and the waste water overflowing from the drain window 42A of the inner basket 42 enters the outer basket 41 and flows into the horizontal draw pipe. 14 to the outside of the drain trap 12.

The horizontal draw pipe 14 is connected to the downstream side of the water seal 34 of the drain trap 12. This horizontal draw pipe 14 is arranged, for example, horizontally on the floor slab 18. The bottom of the outer basket 41 in the drain trap 12 is located near the top surface of the floor slab 18. As a result, the lower end of the inner circumferential surface of the horizontal drawing pipe 14 is located at the level of the bottom of the outer cage 41. A vertical pipe (not shown) extending below the building 15 is connected to the downstream end of the horizontal pipe 14 . The lower end of this vertical pipe is connected to a drainage stack (not shown) that passes through each of the 15 floors of the building.

The ventilation pipe 16 is provided to prevent the water seal 34 from being broken when a siphon force is generated. This vent pipe 16 is connected to a position downstream of the water seal 34 of the drain trap 12, above the horizontal drawing pipe 14, and including the upper part 41A of the drain trap 12. Specifically, the connecting portion 16A of the vent pipe 16 to the drain trap 12 is connected to the upper portion 41A of the outer basket 41 of the drain trap 12, which is inserted into the penetration portion 32 of the flooring material 22. Note that the connecting portion 16A of the ventilation pipe 16 is connected across the upper portion 41A inserted into the penetrating portion 32 and the portion not inserted into the penetrating portion 32, in other words, a portion lower than the flooring material 22. Good too. The upper end of the connecting portion 16A is within a certain thickness range of the flooring material 22. The lower end of the connecting portion 16A may be located lower than the floor material 22, but it is better to have it within the thickness range in order to prevent the waste water accumulated in the drain trap 12 from entering the ventilation pipe 16 as much as possible. preferable.

The ventilation pipe 16 has a low part 16D located at the boundary between a part extending downward from the connecting part 16A with the drain trap 12 (a descending part 16B) and a part going upward again (a main pipe part 16C). In a top view, the lower portion 16D of the ventilation pipe 16 overlaps with the penetration portion 32. The main pipe portion 16C of the ventilation pipe 16 is arranged at a height close to the flooring 22 in the underfloor space 24. The main pipe portion 16C has an upward slope from the low portion 16D toward the rising portion 16E. This is to prevent the waste water from flowing downstream of the vent pipe 16 when the waste water flows into the vent pipe 16 . A rising portion 16E extending upward, for example, is provided at the downstream end of the main pipe portion 16C of the ventilation pipe 16. The rising portion 16E extends upward through a penetrating portion 40 provided in the floor material 22 and an adjacent wall 44.

In addition, as an example, the ventilation pipe 16 extends to the height of water equipment such as a washing machine at the rising portion 16E, and then descends again and enters the underfloor space 24 again, and is connected to, for example, a drainage stand pipe (not shown). has been done.

The ventilation pipe 16 and the horizontal drawing pipe 14 are connected, for example, by a communication pipe 50 extending in the vertical direction. The communication pipe 50 is connected to the lower portion 16D of the ventilation pipe 16. In a top view, the low portion 16D of the ventilation pipe 16 overlaps with the penetration portion 32, so the upper end portion of the communication tube 50 connected to the low portion 16D is also located at a position where it overlaps with the penetration portion 32.

A float valve 52 is provided inside the communication pipe 50. The float valve 52 allows air in the pipe to pass in both directions between the vent pipe 16 and the horizontal draw pipe 14, allows waste water to pass from the vent pipe 16 to the horizontal draw pipe 14, and allows waste water to flow from the horizontal draw pipe 14 to the vent pipe 16. It is configured so that it cannot pass through. Specifically, as shown in FIG. 2, a float 46 is provided inside the communication pipe 50. The density of the float 46 is less than that of air and greater than that of water. The float 46 thus rises against the wastewater and descends against the air. A support portion 48 is provided on the lower side of the float 46 to prevent the float 46 from separating downward from the communication pipe 50. Even when the float 46 is placed on the support section 48, a gap is maintained between the float 46 and the periphery of the support section 48. Therefore, the air inside the pipe can pass in both directions between the ventilation pipe 16 and the horizontal pipe 14, and the waste water can flow from the ventilation pipe 16 to the horizontal pipe 14. On the other hand, a valve seat 54 is provided above the float 46. When the float 46 is pressed against the valve seat 54 by the waste water flowing into the communication pipe 50 from the horizontal draw pipe 14, the space between the communication pipe 50 and the ventilation pipe 16 is closed, and the drainage from the horizontal draw pipe 14 to the ventilation pipe 16 is blocked. It is not allowed to pass through.

(effect)
The present embodiment is configured as described above, and its operation will be described below. In FIG. 1, in the drainage structure 10, an upper part 41A of the drainage trap 12 is inserted into a penetration part 32 provided in the floor material 22, and a ventilation pipe 16 is connected to a position including the upper part 41A. Thereby, the ventilation pipe 16 can be connected to a higher position of the drain trap 12 while suppressing interference between the ventilation pipe 16 and the flooring material 22. Furthermore, since the vertical distance between the vent pipe 16 and the horizontal draw pipe 14 is increased, the connection position between the drain trap 12 and the vent pipe 16 is prevented from being blocked by the waste water that has passed through the water seal 34. Ru. Therefore, air downstream of the water seal 34 in the drain trap 12 flows to the ventilation pipe 16, and the air is prevented from staying in the drain trap 12. Further, as the vertical distance between the ventilation pipe 16 and the horizontal draw pipe 14 increases, the water head also increases, so that the waste water that has passed through the water seal 34 easily flows into the horizontal draw pipe 14.

Further, by aligning the lower end of the inner peripheral surface of the horizontal draw pipe 14 with the height of the bottom of the outer basket 41, the height of the drain trap 12 can be further suppressed.

Furthermore, since the ventilation pipe 16 and the horizontal draw pipe 14 are connected by the communication pipe 50, even when waste water flows into the ventilation pipe 16, the waste water is discharged to the horizontal draw pipe 14 through the communication pipe 50. Therefore, water can be drained from the ventilation pipe 16.

Further, since the float valve 52 is provided inside the communication pipe 50, it is possible to discharge air from the horizontal draw pipe 14 to the ventilation pipe 16 through the communication pipe 50, and also to allow air to be discharged from the horizontal draw pipe 14 through the communication pipe 50. Inflow of waste water from 14 to ventilation pipe 16 can be suppressed.

Furthermore, since the communication pipe 50 is connected to the lower portion 16D of the ventilation pipe 16, even when waste water flows into the ventilation pipe 16, the waste water is easily discharged through the communication pipe 50 to the side draw pipe 14. Specifically, the waste water that has flowed into the descending part 16B from the connecting part 16A of the ventilation pipe 16 and the waste water that has flowed into the main pipe part 16C are both collected in the lower part 16D and are discharged to the horizontal draw pipe 14 through the communication pipe 50. . Therefore, water can be drained from the ventilation pipe 16 efficiently.

Further, the drain trap 12 is connected to the waterproof pan 26, and the low part 16D of the ventilation pipe 16 overlaps with the penetration part 32 of the flooring 22 when viewed from above, so the communication pipe 50 connected to the low part 16D is , located near the drain trap 12. Therefore, the communication pipe 50, which tends to be contaminated, can be easily cleaned from the drain trap 12 side.

In this way, according to the present embodiment, the height of the drain trap 12 is suppressed while allowing the drain water that has passed through the water seal 34 of the drain trap 12 to flow smoothly into the horizontal drain pipe 14 (siphon drain pipe). be able to.

[Second embodiment]
In FIG. 3, in the drainage structure 20 according to the present embodiment, a notch 60 that opens into the through portion 32 is provided in the floor material 22 within the installation range of the waterproof pan 26. The ventilation pipe 16 is connected to a position including the upper part 41A of the drain trap 12 through a notch 60. Specifically, the connecting portion 16A of the vent pipe 16 to the drain trap 12 is connected to the upper portion 41A of the outer basket 41 of the drain trap 12, which is inserted into the penetration portion 32 of the flooring material 22. Note that the connecting portion 16A of the ventilation pipe 16 is connected across the upper portion 41A inserted into the penetrating portion 32 and the portion not inserted into the penetrating portion 32, in other words, a portion lower than the flooring material 22. Good too.

In FIG. 3, the notch 60 has a shape obtained by removing a portion of the floor material 22 from the lower surface side. Since the upper surface side of the floor material 22 is flat including the notch 60, it is suitable for supporting the waterproof pan 26. Moreover, the notch 60 has a flat portion 60A and an inclined portion 60C where the floor material 22 becomes thinner. The inclined portion 60C is a portion that connects the flat portion 60A and the general portion 60B without the notch 60. In the inclined portion 60C, the thickness of the floor material 22 changes. In addition, in the example shown in FIG. 3, the notch 60 does not penetrate the flooring material 22 in the vertical direction, but may be configured to penetrate the flooring material 22 in the vertical direction.

The descending portion 16B of the ventilation pipe 16 is arranged along the inclined portion 60C of the notch 60. The ventilation pipe 16 is arranged horizontally from the connecting portion 16A to just before the descending portion 16B. Note that this section may have a downward slope toward the descending portion 16B. Further, the main pipe portion 16C is arranged at a height close to the flooring 22, and is arranged horizontally up to the rising portion 16E. Note that this section may have a downward slope toward the rising portion 16E.

A lower portion 16D of the ventilation pipe 16 is provided in a portion without the notch 60 and is connected to the communication pipe 50. In other words, the lower portion 16D of the ventilation pipe 16 is provided at a position away from the notch 60, that is, at a position away from the drain trap 12. In FIG. 3, the lower portion 16D of the ventilation pipe 16 is provided directly below the rising portion 16E. The communication pipe 50 is also provided directly below the rising portion 16E. A float valve 52 (see FIG. 2) similar to the first embodiment is provided inside the communication pipe 50.

The other parts are the same as those in the first embodiment, so the same parts are denoted by the same reference numerals in the drawings and their explanation will be omitted.

(effect)
The present embodiment is configured as described above, and its operation will be described below. In FIG. 2, in the drainage structure 20, the ventilation pipe 16 is connected through a notch 60 provided in the flooring 22 to a position of the drainage trap 12 that includes the upper part 41A inserted into the penetration part 32 of the flooring 22. ing. Therefore, interference between the ventilation pipe 16 and the flooring 22 can be suppressed.

Further, a low portion 16D of the ventilation pipe 16 is provided in a portion without the notch 60 and is connected to the communication pipe 50. In other words, the distance from the drain trap 12 to the communication pipe 50 is longer than when the low portion 16D of the ventilation pipe 16 overlaps the penetration part 32 of the flooring 22. Therefore, it is possible to allow drainage water to flow into the ventilation pipe 16 to some extent.

[Reference example]
In FIG. 4, in the drainage structure 30 according to the reference example, a ventilation path 70 is formed inside the outer basket 41 of the drainage trap 12, communicating with the ventilation pipe 16 and extending upward to the level of the flooring 22. ing. As an example, the ventilation path 70 is formed between the inner surface of the outer cage 41 and a first wall portion 71 spaced apart from the inner surface. Further, the ventilation passage 70 extends upward from inside the connection position 41C of the ventilation pipe 16 in the outer car 41. The ventilation passage 70 and the inner side portion 56 of the connection position 41D of the horizontal drawing pipe 14 in the outer basket 41 are connected by a communication passage 58. The communication path 58 is formed between the inner surface of the outer cage 41 and the second wall portion 72 spaced apart from the inner surface.

In the radial direction of the outer car 41, the width of the ventilation passage 70 is smaller than the width of the communication passage 58. The first wall portion 71 and the second wall portion 72 are connected to each other by an inclined wall portion 73 that is inclined with respect to the vertical direction of the outer car 41. The first wall portion 71, the inclined wall portion 73, and the second wall portion 72 are integrally formed, for example, as a wall forming member 74. This wall forming member 74 is removable from the outer cage 41.

As shown in FIG. 8, a guide rail 76 having an L-shaped cross section, for example, is provided on the inner surface of the outer car 41 and extends in the vertical direction. A pair of guide rails 76 are provided. Further, as shown in FIG. 9, the wall forming member 74 is provided with a fitting portion 78 that slides along the guide rail 76 and fits into the guide rail 76. By sliding the fitting portion 78 in the vertical direction along the guide rail 76, the wall forming member 74 can be attached to and detached from the outer cage 41.

Note that the direction in which the wall forming member 74 is attached to the outer cage 41 is not limited to the vertical direction, but may be in the radial direction. As an example, a configuration may be adopted in which a hook portion (not shown) that protrudes radially inward is provided on the inner surface of the outer basket 41, and the fitting portion 78 of the wall forming member 74 is fitted into the hook portion. good. In this case, the wall forming member 74 can be attached to and detached from the outer cage 41 in the radial direction. Note that the hook portion may be formed in an arrow shape or a single arrow shape in cross section. Further, the material of the wall forming member 74 may be an elastic material such as silicone rubber.

As shown in FIGS. 5 to 7, an eaves 64 is provided at the upper end of the ventilation path 70 to block the ventilation path 70 from opening upward. As shown in FIGS. 8 and 9, the eaves 64 is integrally formed, for example, at the upper end of the first wall portion 71 via a plurality of support portions 67. This eaves 64 allows the ventilation passage 70 to open inward in the radial direction of the outer car 41 .

4 and 5, a float valve 62 is provided inside the communication passage 58. As shown in FIGS. This float valve 62 allows air in the pipe to pass in both directions between the ventilation passage 70 and the inner part 56, allows drainage to pass from the ventilation passage 70 to the inner part 56, and does not allow drainage to pass from the inner part 56 to the ventilation passage 70. It is configured as follows. Specifically, a float 66 is provided inside the communication path 58. The density of the float 66 is greater than the density of air and less than the density of water. The float 66 thus rises against the waste water and descends against the air. A support portion 68 is provided below the float 66 to prevent the float 66 from leaving below the communication path 58. Even when the float 66 is placed on the support section 68, a gap is maintained between the float 66 and the periphery of the support section 68. Therefore, the air in the pipe can pass in both directions between the ventilation path 70 and the inner part 56, and the waste water can flow from the ventilation path 70 to the inner part 56. On the other hand, a valve seat 84 is provided above the float 66. When the float 66 is pressed against the valve seat 84 by the waste water flowing into the communication path 58 from the inside part 56, the space between the communication path 58 and the ventilation path 70 is closed, and the drainage is not allowed to pass from the inside part 56 to the ventilation path 70. It looks like this.

Note that the ventilation path 70 and the inner side 56 of the connection position of the horizontal drawing pipe 14 in the outer basket 41 are connected by the communication path 58, but as shown in FIG. 11, the communication path 58 is omitted. However, the ventilation passage 70 may be configured to be open only upwardly and not downwardly. Furthermore, as shown in FIG. 11, the structure may be such that the eaves 64 shown in FIG. 5 are omitted. In this case, the upper end of the air passage 70 may be located above the drainage window 42A of the inner car 42. This is because the waste water passing through the water seal 34 and flowing out from the drain window 42A becomes difficult to flow into the ventilation path 70.

Other parts are the same as those in the first embodiment or the second embodiment, so the same parts are denoted by the same reference numerals in the drawings and their explanation will be omitted.

(effect)
This reference example is configured as described above, and its operation will be explained below. 4 and 5, in the drainage structure 30, a ventilation path 70 is formed inside the outer basket 41 of the drainage trap 12, communicating with the ventilation pipe 16 and extending upward to the level of the flooring 22. Therefore, even if the ventilation pipe 16 is arranged at a position where it does not interfere with the flooring 22, the ventilation pipe 16 is prevented from being blocked by the drainage water that has passed through the water seal 34. As a result, air on the downstream side of the water seal 34 in the drain trap 12 is smoothly exchanged, and the air flows into the ventilation pipe 16. Therefore, air is prevented from remaining downstream of the water seal 34 in the drain trap 12.

Further, the ventilation passage 70 and the inner side 56 of the connection position of the horizontal drawing pipe 14 in the outer cage 41 are connected by the communication passage 58, and the float valve 62 is provided inside the communication passage 58, so that the communication passage It is possible to discharge air from the inner side part 56 to the ventilation passage 70 through the communication passage 58, and to suppress the inflow of waste water from the inner part 56 to the ventilation passage 70 through the communication passage 58. Further, even when waste water flows into the ventilation path 70, the waste water is discharged from the inner part 56 to the horizontal pipe 14 through the communication path 58.

Further, since an eaves 64 is provided at the upper end of the ventilation passage 70 to block the opening of the ventilation passage 70 upward, drainage water that has passed through the water seal 34 is suppressed from flowing into the ventilation passage 70. As a result, a passage for air from the ventilation path 70 to the ventilation pipe 16 is secured, so that air is prevented from staying downstream of the water seal 34 in the drain trap 12.

Further, in this drainage structure 30, the width of the ventilation passage 70 is smaller than the width of the communication passage 58 in the radial direction of the outer basket 41. Further, the first wall portion 71 of the ventilation path 70 and the second wall portion 72 of the communication path 58 are connected to each other by an inclined wall portion 73 that is inclined with respect to the vertical direction of the outer car 41. Therefore, in the drain trap 12, the capacity of the inner basket 42 can be ensured by installing the inner basket 42 from the first wall section 71 along the inclined wall section 73. Therefore, the height of the drain trap 12 can be made compact.

Furthermore, in this drainage structure, the first wall portion 71, the inclined wall portion 73, and the second wall portion 72 are integrally formed, for example, as a wall forming member 74, and are removable from the outer basket 41. By removing the drain trap 74 from the outer basket 41, cleaning of the drain trap 12 becomes easier.

[Other embodiments]

Although an example of the embodiment of the present invention has been described above, the embodiment of the present invention is not limited to the above, and can be implemented with various modifications other than the above without departing from the spirit thereof. Of course there is.

Moreover, it is also possible to combine the above embodiment and reference example as appropriate.

10...Drainage structure, 12...Drainage trap, 14...Horizontal pipe (siphon drainpipe), 16...Vent pipe, 16A...Connection section, 16B...Descent section (portion extending downward), 16C...Main pipe section (upward direction) part), 16D...low part, 20...drainage structure, 22...floor material (plate-like member), 26...waterproof pan, 30...drainage structure, 32...penetrating part, 34...water sealing, 41...outer basket, 42... Inner cage, 43... Inner cylinder, 50... Communication pipe, 52... Float valve

Claims (5)

a drainage trap configured to be able to store sealed water and installed with an upper part inserted into a penetration part provided in a plate-like member;
a siphon drain pipe connected to the downstream side of the water seal of the drain trap;
a vent pipe connected to a position downstream of the water seal of the drain trap, above the siphon drain pipe and including the upper part of the drain trap;
has
The drainage trap includes an outer basket to which the siphon drain pipe and the ventilation pipe are connected, an inner basket arranged inside the outer basket and capable of storing the water seal, and an inner basket arranged inside the inner basket and capable of storing the water seal. It has an inner cylinder that forms a
A drainage structure in which a lower end of the inner circumferential surface of the siphon drainage pipe is located at the height of the bottom of the outer basket . The drainage structure according to claim 1, wherein the ventilation pipe and the siphon drainage pipe are connected by a communication pipe. Inside the communication pipe, air in the pipe passes in both directions between the vent pipe and the siphon drain pipe, waste water passes from the vent pipe to the siphon drain pipe, and from the siphon drain pipe to the vent pipe. The drainage structure according to claim 2 , further comprising a float valve that does not allow drainage to pass through. The vent pipe has a low portion located at a boundary between a portion extending downward from a connection portion between the vent pipe and the drain trap and a portion extending upward again,
The drainage structure according to claim 2 or 3 , wherein the communication pipe is connected to the lower part of the ventilation pipe. The plate-like member is a flooring material,
A waterproof pan is provided on the flooring,
the drain trap is connected to the waterproof pan;
5. The drainage structure according to claim 4 , wherein the low portion of the ventilation pipe overlaps the through portion when viewed from above.