JP7836188B2 - Piping structure and penetration members - Google Patents

Description

This invention relates to a piping structure and a penetration member.

For example, the rain gutter described in Patent Document 1 below has been known for some time.

Japanese Patent Publication No. 2019-007340

By the way, in this type of rain gutter, for example, if you try to extend a downpipe that drains from the eaves gutter downwards from the eaves gutter, the downpipe may interfere with other eaves gutters before it reaches the ground. If the downpipe does not pass through other eaves gutters, and instead drains from the downpipe to other eaves gutters, there is a risk that the drainage from other eaves gutters may overflow, for example, during heavy rain.
To avoid such interference, one could consider a structure in which the gutter is divided at the point where it interferes with the downpipe, allowing the gutter to avoid the downpipe. However, this would increase costs and effort, such as the need to determine the division point and take various measurements, and would also require the installation of drainage outlets for each divided gutter and waterproofing at the division point of each gutter.

This invention was made in view of the circumstances described above, and aims to allow the downpipe to easily pass through the gutter when the downpipe and gutter interfere with each other.

<1> A piping structure according to one aspect of the present invention comprises a drain, a gutter located below the drain and having a through hole at its bottom, a through member fixed to the gutter and positioned in the through hole and penetrating the bottom, and a downpipe connected to the drain and passing through the through member and penetrating the bottom. The downpipe comprises a first downpipe extending downward from the drain, and a second downpipe extending downward from the gutter, having a larger diameter than the first downpipe and with the lower end of the first downpipe positioned inside. The first downpipe or the second downpipe is positioned within the through member and penetrates the bottom.

<2> A piping structure according to one aspect of the present invention comprises a gutter with a through hole at its bottom, a through member fixed to the gutter and positioned in the through hole, penetrating the bottom, and a downpipe passing through the through member and penetrating the bottom. The downpipe comprises a first downpipe located above the gutter and a second downpipe located below the gutter, having a larger diameter than the first downpipe and with the lower end of the first downpipe positioned inside. The first or second downpipe is positioned within the through member and penetrates the bottom.

The downpipe passes through the through-member and penetrates the bottom of the gutter. Therefore, by fixing the through-member to the gutter in order for the worker to pass the downpipe through the gutter, the necessary processing can be carried out at the point where the downpipe and gutter interfere with each other. For example, by fixing the through-member to the gutter, the water in the gutter can be prevented from unexpectedly flowing out through the through-hole. Moreover, since it is only necessary to pass the downpipe through the through-member, the ease of installation can be improved.
From the above, it is possible to easily pass the downpipe through the eaves gutter when the downpipe and eaves gutter interfere with each other.
The second downpipe has a larger diameter than the first downpipe, and the lower end of the first downpipe is positioned inside the second downpipe. Therefore, water flowing through the first downpipe is reliably drained into the second downpipe. In addition, a joint is not required between the first and second downpipes.

<3> In the piping structure described in <1> or <2> above, a pedestrian downpipe for draining from the eaves gutter may be further provided, and the second downpipe may be equipped with a junction joint to which the pedestrian downpipe is connected.

The second downpipe is equipped with a junction joint. Therefore, rainwater from the eaves gutter flows into the second downpipe through the culvert.
Here, the second downpipe has a larger diameter than the first downpipe. Therefore, even if rainwater from the eaves gutter joins the second downpipe, it is less likely to become completely full, and the water is reliably drained through the second downpipe.

<4> A through member according to one aspect of the present invention is a through member used in a piping structure described in any one of <1> to <3> above, comprising: a first member including a first pipe disposed in the through hole and a first flange extending radially outward from the first pipe and disposed on the upper surface of the bottom; and a second member including a second pipe disposed at the lower end of the first pipe and located below the through hole, and a second flange extending radially outward from the second pipe and disposed on the lower surface of the bottom.

The through-member comprises a first member and a second member. Therefore, the through-member can be fixed to the gutter by sandwiching the bottom of the gutter between the first flange of the first member and the second flange of the second member.

<5> In the through-member described in <4> above, at least one of the first member and the second member may be an injection-molded product.

At least one of the first and second components is an injection-molded part. Therefore, even if the shapes of the first and second components are complex, they can be molded with high precision.

<6> In the through-member described in <4> or <5> above, a configuration may be adopted in which the upper end of the first pipe is located above the upper end of the gutter.

The upper end of the first pipe is positioned above the upper end of the gutter. Therefore, for example, it is possible to prevent rainwater from the gutter from unintentionally flowing into the first pipe.

<7> In the through member relating to any one of the above items <4> to <6>, a configuration may be adopted in which a sheath pipe further covers the first pipe from the radially outer side and extends upward from the first flange, and the upper end of the sheath pipe is located above the upper end of the gutter.

The upper end of the conduit pipe is positioned above the upper end of the gutter. Therefore, for example, it is possible to prevent rainwater from the gutter from unintentionally flowing into the conduit pipe.
The sheath pipe covers the first pipe from the radial outside. Therefore, to regulate the inflow of rainwater into the gutter, instead of lengthening the first pipe, the sheath pipe can be lengthened. For this reason, even if the first component, including the first pipe, is an injection-molded product, the first component can be easily molded (however, in general, it is difficult to manufacture extremely long components by injection molding).

According to this invention, when a downpipe and a gutter interfere with each other, the gutter can be easily passed through the downpipe.

This is a perspective view showing a rain gutter according to the first embodiment of the present invention, and a building to which this rain gutter is applied. Figure 1 is a side view of the rain gutter as seen from the side. Figures 1 and 2 are front views of the rain gutter as seen from the front. This is a front view of a rain gutter according to a second embodiment of the present invention. This is a front view of a rain gutter according to a third embodiment of the present invention. This is a front view of a rain gutter according to the fourth embodiment of the present invention. This is a front view of a rain gutter according to a fifth embodiment of the present invention. This is a front view of a rain gutter according to the sixth embodiment of the present invention. Figure 8 is a longitudinal cross-sectional view of a rain gutter. Figure 8 is an exploded perspective view of the through-member that makes up the rain gutter. Figure 8 is a perspective view illustrating the installation method of the rain gutter, showing the first downpipe, the through member, and the second eaves gutter arranged coaxially with the through hole. Figure 8 is a perspective view illustrating the installation method of the rain gutter shown, and shows the state after the state shown in Figure 11, with the first member placed in the first downpipe. Figure 8 is a perspective view illustrating the installation method of the rain gutter shown, and shows the state after the condition shown in Figure 12, with the first downpipe placed in the through-hole. Figure 8 is a longitudinal cross-sectional view showing a first modified example of the rain gutter. Figure 8 is a longitudinal cross-sectional view showing a second modified example of the rain gutter. Figure 3 is a cross-sectional view taken along the line XVI-XVI. Figure 7 shows a state where a portion of the rain gutter is submerged in water. This figure shows a first example of a second downpipe applicable to each embodiment and each modified example of the present invention. This figure shows a second example of a second downpipe applicable to each embodiment and each modified example of the present invention. This figure shows a third example of a second downpipe applicable to each embodiment and each modified example of the present invention. This figure shows a fourth example of a second downpipe applicable to each embodiment and each modified example of the present invention.

(First Embodiment)
The following describes a rain gutter (piping structure) according to one embodiment of the present invention, with reference to Figures 1 to 3.
As shown in Figure 1, the rain gutter 50 drains rainwater from a building 40, such as an apartment building. The building 40 is equipped with a roof 41 and an overhang 42.
The roof 41 has a slope. The canopy 42 is provided on the wall surface of the building 40 where the lower end of the slope of the roof 41 is located. The canopy 42 functions, for example, as a rain shield for openings in the building 40 (for example, windows or entrances 43 (front door)). The canopy 42 may also function as a balcony in an apartment building.

The rain gutter 50 includes a first gutter 51, a second gutter 52, a downpipe 53, a drain 54, and a through member 55.
The first gutter 51 drains rainwater that falls on the roof 41. The first gutter 51 is positioned, for example, at the eaves of the roof 41. In the following, the direction in which the first gutter 51 extends is referred to as the first horizontal direction.
The first gutter 51 comprises a bottom portion 51a and two side portions 51b. The bottom portion 51a is a flat plate with a drainage slope. The two side portions 51b are located at both ends of the bottom portion 51a in the width direction. The side portions 51b extend upward from the bottom portion 51a.

The second gutter 52 drains rainwater that falls on the eaves 42. The second gutter 52 is positioned, for example, between the wall of the building 40 and the eaves 42. The second gutter 52 extends in a first horizontal direction. The second gutter 52 is shorter than the first gutter 51 in the first horizontal direction. The second gutter 52 is located directly below the first gutter 51.
The second gutter 52 comprises a bottom portion 52a and two side portions 52b. The bottom portion 52a is a flat plate with a drainage slope. The two side portions 52b are located at both ends of the bottom portion 52a in the width direction. The side portions 52b extend upward from the bottom portion 52a.

The downpipe 53 extends downward from the first gutter 51. The downpipe 53 discharges the drainage from the first gutter 51 downwards. Multiple downpipes 53 are provided at intervals in the first horizontal direction. The interval between the downpipes 53 in the first horizontal direction is, for example, 30 m or less. The distance in the first horizontal direction from the outermost downpipe 53 of the multiple downpipes 53 to the end (dead end) of the first gutter 51 is, for example, 15 m or less. The height of the downpipe 53 is, for example, 2 m or more, preferably 3 m or more.

As shown in Figures 2 and 3, the drain 54 is located inside the first gutter 51. The drain 54 penetrates the bottom 51a of the first gutter 51. The drain 54 is a component that functions as a drain outlet. The drain 54 drains rainwater from inside the gutter to the outside. The drain 54 has a high drainage function to improve the drainage capacity of rainwater that flows into the gutter during heavy rain. The drainage flow rate per unit area of the drain 54 is, for example, 0.25 L/sec・^cm² or more, preferably 0.30 L/sec・^cm² or more.

The drain 54 is connected to the upper end of the downpipe 53. The drain 54 facilitates the smooth flow of drainage from the first gutter 51 to the downpipe 53. In the rain gutter 50, for example, when the downpipe 53 is filled with rainwater, a siphon effect occurs, and a large amount of rainwater is drained from the first gutter 51 by the drain 54. At this time, the drain 54 does not obstruct the increase in the flow velocity of the rainwater due to the siphon effect, so a large amount of rainwater can be drained from the gutter to the downpipe 53. The drain 54 is equipped with, for example, ribs and a cover (not shown) for the purpose of promoting the siphon effect. The ribs are plate-shaped. The ribs are arranged radially around the axis of the outlet of the drain 54. The ribs straighten the drainage from inside the first gutter 51 toward the outlet. The cover is positioned above the outlet. The cover faces the outlet. The aforementioned lid, for example, restricts the inclusion of air in the wastewater flowing into the drain.

Here, the drain 54 constitutes part of the drainage member 56. The drainage member 56 has the function of generating a siphon effect. When wastewater flows through the inside of the drainage member 56 when it is full, a siphon effect occurs in the wastewater. When a siphon effect occurs, the drainage capacity is higher than when a siphon effect does not occur.
In this embodiment, the drainage member 56 is composed of a drain 54 and a downpipe 53 connected to the drain 54. The downpipe 53 constituting the drainage member 56 has a length of 3m or more downward from the drain 54 (the lower end of the drain 54). As will be described later, if the downpipe 53 (downpipe 53A) is equipped with a first downpipe 71 and a second downpipe 72, then the fact that the downpipe 53 has a length of 3m or more means that the first downpipe 71 has a length of 3m or more.

Unlike this embodiment, the rain gutter 50 may also be equipped with a connecting pipe. The connecting pipe is positioned between the drain 54 and the downpipe 53. In this case, the drainage member 56 is composed of the drain 54, the connecting pipe, the downpipe 53, and elbows (joints) connecting these components. The elbows include a first elbow connecting the drain 54 and the connecting pipe, and a second elbow connecting the connecting pipe and the downpipe. In this case as well, similar to the case without a connecting pipe, the downpipe 53 has a length of 3 meters or more.

In this embodiment, one of the multiple downpipes 53, downpipe 53A, penetrates the second gutter 52 vertically. Downpipe 53A drains rainwater from the first gutter 51. However, downpipe 53A does not directly drain rainwater from the second gutter 52. As shown in Figure 1, downpipe 53A is the central downpipe among the multiple downpipes 53 arranged in the first horizontal direction. As shown in Figures 2 and 3, downpipe 53A passes through the penetration member 55 and penetrates the second gutter 52.

The through member 55 is fixed to the second gutter 52. The through member 55 is positioned in the through hole 52c. The through hole 52c is formed in the bottom 52a of the second gutter 52. The opening area of the through hole 52c is, for example, 5 ^cm² to 300 ^cm² , preferably 13 to 190 ^cm² , and more preferably 20 to 140 ^cm² . The through member 55 penetrates the bottom 52a of the second gutter 52.

The through member 55 comprises a first member 61 and a second member 62. The first member 61 is positioned above the bottom portion 52a. The first member 61 may or may not be fixed to the bottom portion 52a. The second member 62 is positioned below the bottom portion 52a. The second member 62 is fixed to at least one of the first member 61 and the bottom portion 52a.

At least one of the first member 61 and the second member 62 is an injection-molded product. In this embodiment, both the first member 61 and the second member 62 are injection-molded products. The first member 61 and the second member 62 are injection-molded products of synthetic resins such as rigid polyvinyl chloride resin, polycarbonate, ABS, and AES. Note that the second member 62 and the first member 61 are not limited to synthetic resin materials and may be formed from cast iron materials using a mold. Furthermore, the first member 61 and the second member 62 may be formed from different materials.

As shown in Figure 3, the first member 61 includes a first pipe 63 and a first flange 64. The first pipe 63 and the first flange 64 are arranged coaxially.
The first pipe 63 is a circular pipe. The first pipe 63 is positioned in the through hole 52c. In the illustrated example, the first pipe 63 has the same diameter along its entire vertical length. The outer diameter of the first pipe 63 is equal to or slightly smaller (for example, about 5% smaller than the inner diameter) of the through hole 52c. The upper end of the first pipe 63 is located below the upper end of the second gutter 52 (the upper end of the side portion 52b). However, the upper end of the first pipe 63 may be located above the upper end of the second gutter 52, or at the same height as the upper end of the second gutter 52. If the upper end of the first pipe 63 is located above the upper end of the second gutter 52, for example, it is possible to prevent rainwater in the second gutter 52 from unintentionally flowing into the first pipe 63.

The first flange 64 extends radially outward from the first pipe 63. The first flange 64 is positioned on the upper surface of the bottom 52a. The first flange 64 is positioned vertically in the center of the first pipe 63. The first flange 64 is a flat annular (circular) shape extending in a direction perpendicular to the pipe axis of the first pipe 63. The first flange 64 extends continuously around the entire circumference. The lower surface of the first flange 64 may be fixed (e.g., glued) to the upper surface of the bottom 52a.
Furthermore, a male thread may be formed on the portion of the first pipe 63 that is located below the first flange 64 (hereinafter also referred to as the lower end).

The second member 62 includes a second pipe 65 and a second flange 66. The second pipe 65 and the second flange 66 are arranged coaxially.
The second pipe 65 is a circular pipe. The second pipe 65 is located below the through hole 52c. The second pipe 65 is located at the lower end of the first pipe 63. The second pipe 65 has a larger diameter than the first pipe 63. The second pipe 65 covers the first pipe 63 from the radial outside. The lower end of the first pipe 63 is located inside the second pipe 65. In the illustrated example, the lower end of the second pipe 65 is located below the lower end of the first pipe 63. The lower end of the second pipe 65 may be located above the lower end of the first pipe 63, or it may be at the same height as the lower end of the first pipe 63.

The inner surface of the second pipe 65 may have a female thread that fits into the male thread. The second pipe 65 may be screwed (threaded) to the lower end of the first pipe 63. The second pipe 65 may or may not be bonded to the first pipe 63.

The second flange 66 extends radially outward from the second pipe 65. The second flange 66 is positioned on the lower surface of the bottom portion 52a. The second flange 66 is positioned at the upper end of the second pipe 65. The second flange 66 is a flat, annular (circular) flange extending perpendicular to the pipe axis of the second pipe 65. The second flange 66 extends continuously around the entire circumference. The upper surface of the second flange 66 may or may not be fixed (e.g., glued) to the lower surface of the bottom portion 52a. The outer diameter of the second flange 66 may be equal to, larger than, or smaller than the outer diameter of the first flange 64. The second flange 66 sandwiches the bottom portion 52a between itself and the first flange 64.

The downpipe 53A comprises a first downpipe 71 and a second downpipe 72. The first downpipe 71 and the second downpipe 72 are mainly composed of pipes, but may also include fittings.
As shown in Figure 2, the first downpipe 71 extends downward from the drain 54. The first downpipe 71 extends downward from the first gutter 51. The first downpipe 71 drains rainwater from the first gutter 51 downward. In this embodiment, the first downpipe 71 is made of a single pipe.

The second downpipe 72 extends downward from the second gutter 52. The second downpipe 72 is located below the second gutter 52. The second downpipe 72 has a larger diameter than the first downpipe 71. For example, the nominal diameter of the second downpipe 72 is at least one size larger than the nominal diameter of the first downpipe 71. As shown in Figure 3, the lower end of the first downpipe 71 is positioned inside the second downpipe 72. Within the second downpipe 72, the lower end of the first downpipe 71 is movable. The inner surface of the second downpipe 72 and the outer surface of the first downpipe 71 are not bonded together. There is a gap between the inner surface of the second downpipe 72 and the outer surface of the first downpipe 71. Thermal expansion and contraction between the first downpipe 71 and the second downpipe 72 are permitted.

As described above, the second downpipe 72 is formed with a nominal diameter that is one, two, or three sizes larger than the first downpipe 71.
Specifically, if the nominal diameter of the first downpipe 71 is 75A, the second downpipe 72 is formed with a nominal diameter of 100A (one size larger), 125A (two sizes larger), or 150A (three sizes larger).

Furthermore, if the nominal diameter of the first downpipe 71 is 100A, the second downpipe 72 is formed with a nominal diameter of 120A (one size larger), 150A (two sizes larger), or 200A (three sizes larger).
Furthermore, the second downpipe 72 is formed with a nominal diameter of 150A, which is one size larger, or a nominal diameter of 200A, which is two sizes larger, when the nominal diameter of the first downpipe 71 is 125A.
In addition, the second downpipe 72 is formed with a nominal diameter of 200A, which is one size larger than the nominal diameter of the first downpipe 71, which is 150A.
In this case, it is preferable that the second downpipe 72 is formed so that its nominal diameter does not exceed 200A.

Furthermore, it is preferable that the second downpipe 72 is arranged concentrically with the first downpipe 71, and that a first gap S, approximately equal in the radial direction, is formed between the outer circumferential surface of the first downpipe 71 and the inner circumferential surface of the second downpipe 72, extending around the entire circumference.

In this state, if the nominal diameter of the second downpipe 72 is one size larger than the nominal diameter of the first downpipe 71, the first gap S between the outer surface of the first downpipe 71 and the inner surface of the second downpipe 72 is formed to be 2 to 19 mm, preferably 3 to 10 mm. The first gap S is opened upward (outward) from the upper end of the second downpipe 72.
If the nominal diameter of the second downpipe 72 is one size larger than the nominal diameter of the first downpipe 71, the first gap S can be kept narrow. As a result, even if a large flow of rainwater due to the siphon effect flows down the first downpipe 71, it is difficult for the rainwater inside the downpipe 53A to be ejected to the outside from the opening of the first gap S (i.e., the upper end of the second downpipe 72). Furthermore, it is difficult for debris and small animals to enter the inside of the main pipe 32 from the opening of the first gap S.

Furthermore, if the nominal diameter of the second downpipe 72 is two sizes larger than the nominal diameter of the first downpipe 71, the first gap S is formed to be 15 to 32 mm, preferably 15 to 22 mm.
If the nominal diameter of the second downpipe 72 is two sizes larger than the nominal diameter of the first downpipe 71, the first gap S can be made wider to some extent. This reduces contact between the second downpipe 72 and the first downpipe 71 when they vibrate due to wind or vibration, thereby preventing noise generated by contact. It also accommodates radial thermal expansion and contraction caused by the first downpipe 71.

Furthermore, if the nominal diameter of the second downpipe 72 is three sizes larger than the nominal diameter of the first downpipe 71, the first gap S between the outer circumferential surface of the first downpipe 71 and the inner circumferential surface of the second downpipe 72 is formed to be 27 to 45 mm, preferably 28 to 33 mm.
If the nominal diameter of the second downpipe 72 is three sizes larger than the nominal diameter of the first downpipe 71, the first gap S can be made sufficiently wide. This reduces contact between the second downpipe 72 and the first downpipe 71 when they sway due to wind or vibration, thus preventing noise generated by contact. It also accommodates radial thermal expansion and contraction caused by the first downpipe 71.

In this embodiment, the first downpipe 71 or the second downpipe 72 is positioned within the through member 55 and penetrates the bottom 52a. In the illustrated example, the second downpipe 72 is positioned within the through member 55 and penetrates the bottom 52a. The upper end of the second downpipe 72 is located above the upper end of the second gutter 52.
However, the upper end of the second downpipe 72 may be located below the upper end of the second gutter 52. In this case, rainwater in the second gutter 52 may flow directly into the upper end of the second gutter 52. Furthermore, for example, if the first downpipe 71 penetrates the bottom 52a, the second downpipe 72 does not need to penetrate the bottom 52a. In this case, the upper end of the second downpipe 72 (the upper end of the first pipe material 73, which will be described later in the illustrated example) is located below the bottom 52a.

The nominal diameter of the second downpipe 72 is at least one size smaller than the nominal diameter of the through-member 55. Within the through-member 55, the second downpipe 72 is freely movable. The inner circumferential surface of the through-member 55 and the outer circumferential surface of the second downpipe 72 are not bonded together. There is a gap between the inner circumferential surface of the through-member 55 and the outer circumferential surface of the second downpipe 72. Thermal expansion and contraction between the through-member 55 and the second downpipe 72 is permitted.

The second downpipe 72 is made up of multiple components (pipes and fittings). The second downpipe 72 comprises a first pipe 73, a junction fitting 74, and a second pipe 75. The first pipe 73, the junction fitting 74, and the second pipe 75 are arranged in this order from top to bottom. The nominal diameters of the first pipe 73, the junction fitting 74, and the second pipe 75 are all the same.

The first pipe 73 constitutes the upper end of the second downpipe 72. The first pipe 73 is positioned within the penetration member 55. The upper end of the first pipe 73 is located above the upper end of the penetration member 55. The lower end of the first pipe 73 is located below the lower end of the penetration member 55. In the illustrated example, the lower end of the first downpipe 71 is located within the first pipe 73. The lower end of the first downpipe 71 is located above the lower end of the first pipe 73.

As shown in Figure 3, the junction fitting 74 is, for example, a tee. Examples of tees include so-called 90° tees and 45° Y-tees. The junction fitting 74 comprises a first socket 76, a second socket 77, and a third socket 78. The first socket 76 faces upward, the second socket 77 faces downward, and the third socket 78 faces sideways (horizontally).

The lower end of the first pipe 73 is positioned (bonded) to the first socket 76. The upper end of the second pipe 75 is positioned (bonded) to the second socket 77. The second pipe 75 extends downward from the junction joint 74. A connecting gutter 80 is connected (bonded) to the second socket 77. The connecting gutter 80 drains rainwater from the second gutter 52. The connecting gutter 80 directs rainwater from a drainage hole (not shown) formed in the bottom 52a of the second gutter 52 into the junction joint 74. The drainage hole is located at a different position in the bottom 52a than the through member 55. The nominal diameter of the connecting gutter 80 is the same as the nominal diameter of the junction joint 74.

For example, the nominal diameter of the first downpipe 71 can be 75, the nominal diameter of the second downpipe 72 (first pipe material 73, junction joint 74, second pipe material 75) can be 100, the nominal diameter of the through member 55 can be 125, and the nominal diameter of the downpipe 80 can be 100.
Alternatively, instead of the junction joint 74, a socket having receiving openings only at the upper and lower ends may be used. In this case, the drainage from the second gutter 52 does not, for example, merge with the second downpipe 72 via the pedestrian gutter 80, but rather merges with a drainage system separate from the second downpipe 72. Also, if there is no junction joint 74, the second downpipe 52 can be formed from a single pipe. The same applies to the junction joint 74 according to the other embodiments shown below.

As described above, according to the rain gutter 50 of this embodiment, the downpipe 53A passes through the penetration member 55 and penetrates the bottom 52a of the second gutter 52. Therefore, in order for a worker to pass the downpipe 53A through the second gutter 52, the worker can fix the penetration member 55 to the second gutter 52 and perform the necessary processing at the position where the downpipe 53A and the second gutter 52 interfere. For example, by fixing the penetration member 55 to the second gutter 52, the water in the second gutter 52 can be prevented from unexpectedly flowing out through the penetration hole 52c by the penetration member 55. Moreover, since it is only necessary to pass the downpipe 53A through the penetration member 55, the ease of installation can be improved.
From the above, when the downpipe 53A and the second gutter 52 interfere with each other, the second gutter 52 can be easily passed through the downpipe 53A.
The second downpipe 72 has a larger diameter than the first downpipe 71, and the lower end of the first downpipe 71 is positioned inside the second downpipe 72. Therefore, water flowing through the first downpipe 71 is reliably drained into the second downpipe 72. In addition, a joint is not required between the first downpipe 71 and the second downpipe 72.

The second downpipe 72 is equipped with a merging joint 74. Therefore, rainwater from the second gutter 52 merges with the second downpipe 72.
Here, the second downpipe 72 has a larger diameter than the first downpipe 71. Therefore, even if rainwater from the second gutter 52 joins the second downpipe 72, the second downpipe 72 is less likely to become completely full, and the water is reliably drained through the second downpipe 72.

The through member 55 comprises a first member 61 and a second member 62. Therefore, the through member 55 can be fixed to the second gutter 52 by sandwiching the bottom 52a of the second gutter 52 between the first flange 64 of the first member 61 and the second flange 66 of the second member 62.

At least one of the first member 61 and the second member 62 is an injection-molded product. Therefore, even if the shapes of the first member 61 and the second member 62 are complex, they can be molded with high precision.

(Second Embodiment)
Next, a rain gutter 50A according to a second embodiment of the present invention will be described with reference to Figure 4.
In this second embodiment, the same reference numerals are used for parts that are the same as those in the first embodiment, and their descriptions are omitted. Only the differences will be described.

In this embodiment, the second downpipe 72 is not located within the through-member 55. The upper end of the second downpipe 72 is located below the bottom 52a of the second gutter 52. The upper end of the second downpipe 72 is also located below the lower end of the through-member 55. The inner diameter of the second downpipe 72 is larger than the inner diameter of the through-member 55. Therefore, even if rainwater from the second gutter 52 flows into the through-member 55, this rainwater will flow into the second downpipe 72 and will be less likely to be discharged outside the gutter 50A.

In this embodiment, the first downpipe 71 is positioned within the through member 55 in place of the second downpipe 72, and penetrates the bottom 52a. The lower end of the first downpipe 71 is located below the bottom 52a of the second gutter 52. The lower end of the first downpipe 71 is positioned within the first pipe 73. The lower end of the first downpipe 71 is located above the lower end of the first pipe 73.

The nominal diameter of the first downpipe 71 is at least one size smaller than the nominal diameter of the through-member 55. Within the through-member 55, the first downpipe 71 is freely movable. The inner circumferential surface of the through-member 55 and the outer circumferential surface of the first downpipe 71 are not bonded together. There is a gap between the inner circumferential surface of the through-member 55 and the outer circumferential surface of the first downpipe 71. Thermal expansion and contraction between the through-member 55 and the first downpipe 71 is permitted.

For example, the nominal diameter of the first downpipe 71 can be 75, the nominal diameter of the second downpipe 72 (first pipe material 73, junction joint 74, second pipe material 75) can be 100, the nominal diameter of the through member 55 can be 100, and the nominal diameter of the downpipe 80 can be 100.
Thus, the nominal diameter (100) of the through member 55 in the second embodiment is smaller than the nominal diameter (125) of the through member 55 in the first embodiment. Therefore, in the rain gutter 50A according to the second embodiment, the drainage of rainwater in the second eaves gutter 52 is less likely to be obstructed by the through member 55 compared to the rain gutter 50 according to the first embodiment.

(Third Embodiment)
Next, a rain gutter 50B according to a third embodiment of the present invention will be described with reference to Figure 5.
In this third embodiment, the same reference numerals are used for parts that are the same as those in the second embodiment, and their descriptions are omitted. Only the differences will be described.

In this embodiment, the second downpipe 72 includes a socket 79 in addition to the first pipe 73, the junction joint 74, and the second pipe 75. The socket 79 is a tubular joint with two receiving ends. The socket 79 is located above the first pipe 73. The socket 79 constitutes the upper end of the second downpipe 72. The socket 79 connects the lower end of the through member 55 to the upper end of the first pipe 73. The lower end of the second member 62 (second pipe 65) is positioned (bonded) inside the upper end of the socket 79. The upper end of the first pipe 73 is positioned (bonded) inside the lower end of the socket 79. The socket 79 and the junction joint 74 are connected via the first pipe 73.
In this rain gutter 50B, even if rainwater from the second gutter 52 flows into the penetration member 55, this rainwater flows into the socket 79 and is less likely to be discharged to the outside of the rain gutter 50B.

The lower end of the first downpipe 71 is positioned within the socket 79. The lower end of the first downpipe 71 is located below the upper end of the socket 79 and above the lower end of the socket 79. Here, the lower end of the first downpipe 71 may be positioned above the lower end of the through member 55, at the same height as the lower end of the through member 55, or below the lower end of the through member 55.

For example, the nominal diameter of the first downpipe 71 can be 75, the nominal diameter of the second downpipe 72 (socket 79, first pipe 73, junction joint 74, second pipe 75) can be 100, the nominal diameter of the through member 55 can be 100, and the nominal diameter of the downpipe 80 can be 100.

(Fourth Embodiment)
Next, a rain gutter 50C according to the fourth embodiment of the present invention will be described with reference to Figure 6.
In this fourth embodiment, the same reference numerals are used for parts that are identical to those in the third embodiment, and their descriptions are omitted. Only the differences will be described.

In this embodiment, the second downpipe 72 includes a junction joint 74 and a second pipe member 75, but does not include a socket 79 and a first pipe member 73. In this embodiment, the junction joint 74 constitutes the upper end of the second downpipe 72. The junction joint 74 connects the lower end of the through member 55 and the upper end of the second pipe member 75. The lower end of the second member 62 (second pipe 65) is positioned (bonded) inside the first socket 76.
In this rain gutter 50C, even if rainwater from the second gutter 52 flows into the penetration member 55, this rainwater flows into the junction joint 74 and is less likely to be discharged to the outside of the rain gutter 50C.

The lower end of the first downpipe 71 is positioned within the junction joint 74. The lower end of the first downpipe 71 is located below the upper end of the junction joint 74 and above the lower end of the junction joint 74. Here, the lower end of the first downpipe 71 may be positioned above the lower end of the through member 55, at the same height as the lower end of the through member 55, or below the lower end of the through member 55.

For example, the nominal diameter of the first downpipe 71 can be 75, the nominal diameter of the second downpipe 72 (junction joint 74, second pipe material 75) can be 100, the nominal diameter of the through member 55 can be 100, and the nominal diameter of the connecting downpipe 80 can be 100.

(Fifth Embodiment)
Next, a rain gutter 50D according to a fifth embodiment of the present invention will be described with reference to Figure 7.
In this fifth embodiment, the same reference numerals are used for parts that are the same as those in the second embodiment, and their descriptions are omitted. Only the differences will be described.

In this embodiment, the second downpipe 72 comprises a first pipe 73, a junction joint 74, and a second pipe 75. The nominal diameter of the second downpipe 72 is larger than the nominal diameter of the through member 55. The lower end of the through member 55 is positioned inside the first pipe 73. The lower end of the through member 55 is located below the upper end of the first pipe 73 and above the lower end of the first pipe 73. Here, there may or may not be a gap between the outer surface of the lower end of the through member 55 and the inner surface of the upper end of the first pipe 73.
In this rain gutter 50D, even if rainwater from the second eaves gutter 52 flows into the penetration member 55, this rainwater flows into the first pipe 73 and is less likely to be discharged to the outside of the rain gutter 50D.

The lower end of the first downpipe 71 is positioned within the first pipe 73. The lower end of the first downpipe 71 is located below the upper end of the first pipe 73 and above the lower end of the first pipe 73. Here, the lower end of the first downpipe 71 only needs to be below the upper end of the through-member 55, it may be above the bottom 52a of the second gutter 52, it may be positioned above the lower end of the through-member 55, it may be at the same height as the lower end of the through-member 55, or it may be positioned below the lower end of the through-member 55.

For example, the nominal diameter of the first downpipe 71 can be 75, the nominal diameter of the second downpipe 72 (first pipe member 73, junction joint 74, second pipe member 75) can be 125, and the nominal diameter of the through member 55 can be 100.

Here, in explaining the nominal diameter of the downpipe 80, we will once again explain the surrounding structure of the downpipe 80.
Between the second gutter 52 and the downpipe 80, a drain 81, a first fitting 82, a short pipe 83, and a second fitting 84 are arranged. The drain 81 is located at the bottom 52a of the second gutter 52. The drain 81 has a drain opening 81a. The first fitting 82 connects the drain 81 and the short pipe 83. The first fitting 82 is, for example, a socket. The short pipe 83 extends downward from the first fitting 82. The second fitting 84 connects the short pipe 83 and the downpipe 80. The second fitting 84 is, for example, an elbow.

If the nominal diameter of the second downpipe 72 is 125, then the nominal diameter of the connecting downpipe 80 should also be 125. However, if the nominal diameter of the connecting downpipe 80, and the components located upstream of the second gutter 52 (second joint 84, short pipe 83, first joint 82, drain 81), are set to 125, then the bottom 52a of the second gutter 52 must also be sized to accommodate the drain 81, which has a nominal diameter of 125. Therefore, a size constraint arises, forcing the second gutter 52 to be made larger.

Therefore, it is preferable to change the nominal diameter in the first joint 82 and the second joint 84 so that the diameter of the downpipe 80 side (downstream side) relative to the second gutter 52 is increased. For example, the first joint 82 and the second joint 84 may be diameter-expanding joints (increasers).
Alternatively, as shown in Figure 7, it is preferable to provide a conversion joint 85 for converting the nominal diameter between the downpipe 80 and the junction joint 74.
In any of these cases, the nominal diameter of the drain 81 can be made smaller than the nominal diameter of the second downpipe 72, for example, 75 or 100. As a result, the size constraints mentioned above can be suppressed.

Furthermore, when using a conversion joint 85 as shown in Figure 7, the nominal diameters of the drain 81, first joint 82, short pipe 83, second joint 84, and downpipe 80 are all set to 100, and the conversion joint 85 can be configured to convert the nominal diameter from 100 to 125.

Here, as shown in Figure 17, we will explain the case where the rain gutter 50D according to this embodiment is submerged up to below the junction joint 74 (including the drain basin 160 which will be described later), based on Figure 17. Hereafter, we will assume that there is a gap (hereinafter also referred to as the second gap S2) between the outer surface of the lower end of the through member 55 and the inner surface of the upper end of the first pipe material 73. In Figure 17, the short horizontal dashed lines (hatching) represent rainwater.
For example, heavy rain may cause rainwater W to accumulate, potentially submerging the area below the junction joint 74 (i.e., partway down the second downpipe 72). In this case as well, the air and rainwater that have flowed from the first downpipe 71 into the second downpipe 72 can be guided to the second gap S2 between the penetration member 55 and the second downpipe 72, allowing them to overflow to the outside as indicated by arrow A for exhaust and drainage.
Furthermore, the upper end of the second downpipe 72 (i.e., the upper end of the second gap S2) is positioned below the bottom 52a of the second gutter 52. Therefore, even if it is submerged in water as described above, air and rainwater W from the second gutter 52 can be exhausted and drained through the second gap S2.
Furthermore, these effects are similarly achieved in the rain gutter 50A according to the second embodiment shown in Figure 4. In the rain gutter 50A according to the second embodiment, the upper end of the second downpipe 72 (first pipe material 73) is below the lower end of the through member 55. Between the upper end of the second downpipe 72 and the lower end of the through member 55, there is a space corresponding to the second gap S2 mentioned above. When submerged, air and rainwater W are drained through this space.

(Sixth Embodiment)
Next, a rain gutter 50E according to the sixth embodiment of the present invention will be described with reference to Figures 8 to 13.
In this sixth embodiment, the same reference numerals are used for parts that are the same as those in the second embodiment, and their descriptions are omitted. Only the differences will be described.

As shown in Figures 8 to 10, in this embodiment, there is substantially no gap between the outer surface of the first downpipe 71 and the inner surface of the through member 55 (first pipe 63). When the through member 55 is assembled to the first downpipe 71, the frictional force between the through member 55 and the first downpipe 71 may prevent the through member 55 from detaching from the first downpipe 71. However, there may be a gap between the outer surface of the first downpipe 71 and the inner surface of the through member 55 (first pipe 63).

In this embodiment, the second member 62 includes ribs 67 in addition to the second pipe 65 and the second flange 66. Multiple ribs 67 are arranged at intervals around the circumferential direction of the second pipe 65. The upper ends of the ribs 67 are connected to the lower surface of the second flange 66. The radial size (width) of the ribs 67 decreases from the upper end to the lower end. The ribs 67 are plate-shaped. When viewed from the front (circumferential direction), the ribs 67 have a right-angled triangular shape.

To install this rain gutter 50E, an example of how a worker passes the second gutter 52 through the downpipe 53A will be described. As shown in Figures 11 and 12, the worker inserts the first member 61 into the first downpipe 71. As shown in Figure 13, the worker inserts the first downpipe 71, with the first member 61 inserted, into the through-hole 52c. The worker then inserts the second member 62 into the first downpipe 71 from its lower end, and assembles the second member 62 to the first member 61.

In this embodiment, the lower end of the first pipe 63 is located below the lower end of the second pipe 65. However, the lower end of the first pipe 63 may be located above the lower end of the second pipe 65.
Furthermore, in this embodiment, the upper end of the second downpipe 72 is not connected to the lower end of the first pipe 63. However, the upper end of the second downpipe 72 (for example, the first pipe material 73, the junction joint 74, or other joints (for example, a socket)) may be connected to the lower end of the first pipe 63.

Furthermore, as modified versions of the rain gutter 50E, the rain gutter 50F according to the first modified version shown in Figure 14, or the rain gutter 50G according to the second modified version shown in Figure 15, may also be used.

In the first modified example of the rain gutter 50F shown in Figure 14, the upper end of the first pipe 63 is located above the upper end of the second gutter 52. Therefore, for example, it is possible to prevent rainwater in the second gutter 52 from unintentionally flowing into the first pipe 63.

In the second modified example of the rain gutter 50G shown in Figure 15, the through member 55 further includes a conduit pipe 68 in addition to the first member 61 and the second member 62. The conduit pipe 68 covers the first pipe 63 from the radial outside. The conduit pipe 68 extends upward from the first flange 64. The upper end of the conduit pipe 68 is located above the upper end of the second gutter 52. Therefore, for example, it is possible to prevent rainwater in the second gutter 52 from unintentionally flowing into the conduit pipe 68. The conduit pipe 68 is, for example, an extruded product.
The conduit pipe 68 covers the first pipe 63 from the radial outside. Therefore, instead of lengthening the first pipe 63 to restrict the inflow of rainwater into the second gutter 52, the conduit pipe 68 can be lengthened. For this reason, even if the first member 61, including the first pipe 63, is an injection-molded product, the first member 61 can be easily molded (however, in general, it is difficult to manufacture extremely long members by injection molding).

In each of these modified examples, there may be a gap between the outer surface of the first downpipe 71 and the inner surface of the through member 55.

(Example of the second downpipe)
First to fourth examples of the second downpipe 72 applicable to each of the above embodiments and each of the above modifications will be described with reference to Figures 18 to 21.

As shown in Figure 18, the second downpipe 72A in the first example is connected to a drainage manhole 160. The drainage manhole 160 is buried underground. The drainage manhole 160 has a bottom 163, side sections 164, an upper opening 165, and a cover 166. The upper opening 165 is closed from above by the cover 166. A horizontal pipe 161 is connected to the drainage manhole 160. The horizontal pipe 161 is connected to a sewer pipe (not shown). Rainwater drained into the drainage manhole 160 is guided to the horizontal pipe 161 and drained through the horizontal pipe 161 to the sewer pipe (not shown). Therefore, rainwater is less likely to accumulate above the horizontal pipe 161 within the drainage manhole 160.

A through-hole 167 is formed in the cover portion 166. The second downpipe 72 is inserted into the drain basin 160 through the through-hole 167. The lower end of the second downpipe 72 is located inside the drain basin 160. The lower end opening of the second downpipe 72 is located inside the drain basin 160 and opens into the drain basin 160. The lower end of the second downpipe 72 is located above the horizontal pipe 161. Alternatively, a notch may be formed in the cover portion 166 instead of the through-hole 167, and the second downpipe 72 may be inserted into this notch.

As explained above, with this second downpipe 72A, the lower end opening of the second downpipe 72A opens into the drain basin 160. This makes it easier to exhaust the air inside the second downpipe 72A through the lower end opening, and also makes it easier to drain the rainwater inside the second downpipe 72A into the drain basin 160 through the lower end opening. Therefore, rainwater from the second downpipe 72A can flow well into the drain basin 160 through the lower end opening.
The lower end of the second downpipe 72A is positioned above the horizontal pipe 161. Therefore, it is possible to prevent the lower end of the second downpipe 72A from being submerged in water within the drain basin 160.
The second downpipe 72A is inserted into the through hole 167 (or notch). Therefore, a certain amount of vertical movement of the second downpipe 72A is permitted. As a result, even if the second downpipe 72A expands or contracts during installation, or if it undergoes thermal expansion or contraction, these expansions and contractions can be accommodated.

(Second example of the second downpipe)
As shown in Figure 19, the lower end of the second downpipe 72B in the second example is connected, for example, to the first elbow 126, the connecting pipe 127, and the second elbow 128 in this order.
The lower end of the second downpipe 72B is connected to one end of the first elbow 126. The other end of the first elbow 126 is connected to one end of the connecting pipe 127. The connecting pipe 127 penetrates the side 164 of the drain manhole 160. The connecting pipe 127 is positioned horizontally. One end of the connecting pipe 127 is located outside the drain manhole 160. The other end of the connecting pipe 127 is located inside the drain manhole 160. One end of the second elbow 128 is connected to the other end of the connecting pipe 127. The other end of the second elbow 128 is facing downwards. The other end (lower opening) of the second elbow 128 is located above the horizontal pipe 161. The lower end of the second downpipe 72B is also located above the horizontal pipe 161.

As explained above, with this second downpipe 72B, the lower end of the second downpipe 72B is connected to the drain basin 160 via the first elbow 126, connecting pipe 127, and second elbow 128. Therefore, compared to the second downpipe 72A of the first example, the presence of the first elbow 126, connecting pipe 127, and second elbow 128 makes it more difficult for air inside the second downpipe 72B to be exhausted from the lower end.
When such a second downpipe 72B is applied to the rain gutter 50A according to the second embodiment shown in Figure 4, or the rain gutter 50D according to the fifth embodiment shown in Figure 7, the effect of making it easier for the air in the second downpipe 72B to be exhausted to the outside through the second gap S2 (in the case of the rain gutter 50A according to the second embodiment, the space mentioned above) is significantly achieved.

The other end (lower opening) of the second elbow 128 and the lower end of the second downpipe 72B are positioned above the horizontal pipe 161. Therefore, it is possible to prevent the lower opening of the second elbow 128 and the lower end of the second downpipe 72B from being submerged.

(Third example of the second downpipe)
As shown in Figure 20, the second downpipe 72C according to the third example comprises an upper pipe 123 and a lower pipe 124. The upper pipe 123 and the lower pipe 124 are pipes that extend in the vertical direction. The upper pipe 123 comprises, for example, the first pipe material 73, the junction joint 74, and the second pipe material 75. The upper pipe 123 constitutes the upper part of the second downpipe 72C. The lower pipe 124 constitutes the lower part of the second downpipe 72C. The lower pipe 124 rises upward from the ground.

The lower pipe 124 has a larger flow area than the upper pipe 123. The lower pipe 124 has a larger diameter than the upper pipe 123. Specifically, the lower pipe 124 is formed to a nominal diameter that is, for example, one, two, or three sizes larger than the upper pipe 123. The lower end of the upper pipe 123 is inserted into the lower pipe 124 from above. The lower pipe 124 protects the upper pipe 123 from the radial outside. Preferably, the lower pipe 124 is arranged concentrically with the upper pipe 123, and a gap approximately equal in the radial direction is formed between the outer surface of the upper pipe 123 and the inner surface of the lower pipe 124 along the entire circumference.

(Example 4 of the second downpipe)
As shown in Figure 21, the second downpipe 72D according to the fourth example comprises an upper pipe 123, a lower pipe 124, and an enlarged diameter joint 125.

The diameter-expanding joint 125 connects the upper pipe 123 and the lower pipe 124. The lower end of the diameter-expanding joint 125 has a larger diameter than its upper end. The upper end of the diameter-expanding joint 125 is connected to the lower end of the upper pipe 123. The lower end of the diameter-expanding joint 125 is connected to the upper end of the lower pipe 124.

As explained above, according to the second downpipes 72C and 72D of the third and fourth examples, the second downpipe 72B comprises an upper pipe 123 and a lower pipe 124, and the flow area of the lower pipe 124 is larger than the flow area of the upper pipe 123. Therefore, it is possible to easily generate negative pressure in the upper pipe 123. As a result, for example, if the upper pipe 123 is equipped with a junction joint 74, rainwater can be stably merged from the downpipe 80 into the upper pipe 123.

Furthermore, the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

The drainage member 56 is not required. The downpipe 53A may drain rainwater from the first gutter 51 without utilizing the siphon effect.
The first member 61 and the second member 62 do not necessarily have to be injection-molded products.

The first flange 64 of the first member 61 is positioned at the upper vertical end of the first pipe 63, and the first pipe 63 does not necessarily have to be located inside the second gutter 52. In particular, as shown in Figures 5, 6, and 7, if the lower end of the second member 62 is connected to the upper end of the second downpipe 72, or positioned inside the upper end of the second downpipe 72, even if rainwater in the second gutter 52 unintentionally flows into the first pipe 63, it will flow into the second downpipe 72 and will not flow out of the gutter 50.

The through member 55 does not necessarily have to include the first member 61. In particular, as shown in Figures 5, 6, and 7, when the lower end of the second member 62 is connected to the upper end of the second downpipe 72, or positioned inside the upper end of the second downpipe 72, even if rainwater in the second gutter 52 unintentionally flows into the first pipe 63, it flows into the second downpipe 72 and therefore does not flow out of the gutter 50.

The through member 55 does not necessarily have to include the second member 62. In particular, as shown in Figures 5, 6, and 7, when the lower end of the first member 61 is positioned inside the upper end of the second downpipe 72, even if rainwater in the second gutter 52 unintentionally flows into the first pipe 63, it flows into the second downpipe 72 and does not flow out of the gutter 50.

The first pipe 63 of the first member 61 or the second pipe 65 of the second member 62 does not have to be a circular pipe; for example, it may be an elliptical or rectangular tube that is long in the direction of the long axis of the second gutter 52. Even if the first member 61 and the second member 62 move in the direction of their long axis due to thermal expansion and contraction of the second gutter 52, interference between the first downpipe 71 and the second downpipe 72 and the first member 61 and the second member 62 can be prevented.

Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate.

50, 50A, 50B, 50C, 50D, 50E, 50F, 50G Rain gutters (drainage structure)
52. Second eaves gutter (eaves gutter)
52a Bottom 52c Through hole 53A Downpipe 54 Drain 55 Through member 56 Drainage member 61 First member 62 Second member 63 First pipe 64 First flange 65 Second pipe 66 Second flange 68 Sheath pipe 71 First downpipe 72, 72A, 72B, 72C, 72D Second downpipe 74 Junction joint 80 Nomination pipe

Claims (7)

Drain and,
A gutter located below the aforementioned drain, with a through hole at its bottom,
A through member fixed to the gutter and positioned in the through hole and passing through the bottom,
It comprises a downpipe connected to the drain, passing through the through member and penetrating the bottom,
The aforementioned downpipe is,
A first downpipe extending downward from the drain,
The system includes a second downpipe that extends downward from the aforementioned gutter, has a larger diameter than the first downpipe, and has the lower end of the first downpipe positioned inside it,
The first downpipe or the second downpipe is a piping structure that is arranged within the through member and penetrates the bottom ,
The system further includes a drainpipe for draining water from the aforementioned gutter,
The piping structure includes a second downpipe with a junction joint to which the connecting downpipe is connected . A gutter with a through hole at the bottom,
A through member fixed to the gutter and positioned in the through hole and passing through the bottom,
It comprises a downpipe that passes through the through member and penetrates the bottom,
The aforementioned downpipe is,
A first downpipe located above the aforementioned eaves gutter,
The system comprises a second downpipe located below the aforementioned gutter, having a larger diameter than the first downpipe and with the lower end of the first downpipe positioned inside it,
The first downpipe or the second downpipe is a piping structure that is arranged within the through member and penetrates the bottom ,
The system further includes a drainpipe for draining water from the aforementioned gutter,
The piping structure includes a second downpipe with a junction joint to which the connecting downpipe is connected . Drain and,
A gutter located below the aforementioned drain, with a through hole at its bottom,
A through member fixed to the gutter and positioned in the through hole and passing through the bottom,
It comprises a downpipe connected to the drain, passing through the through member and penetrating the bottom,
The aforementioned downpipe is,
A first downpipe extending downward from the drain,
The system includes a second downpipe that extends downward from the aforementioned gutter, has a larger diameter than the first downpipe, and has the lower end of the first downpipe positioned inside it,
The first downpipe or the second downpipe is a through-member used in a piping structure, which is placed within the through-member and penetrates the bottom .
A first member comprising a first pipe positioned in the through hole, and a first flange extending radially outward from the first pipe and positioned on the upper surface of the bottom,
The second member includes a second pipe positioned at the lower end of the first pipe and below the through hole, and a second flange extending radially outward from the second pipe and positioned on the lower surface of the bottom ,
The upper end of the first pipe is a penetrating member located above the upper end of the gutter . Drain and,
A gutter located below the aforementioned drain, with a through hole at its bottom,
A through member fixed to the gutter and positioned in the through hole and passing through the bottom,
It comprises a downpipe connected to the drain, passing through the through member and penetrating the bottom,
The aforementioned downpipe is,
A first downpipe extending downward from the drain,
The system includes a second downpipe that extends downward from the aforementioned gutter, has a larger diameter than the first downpipe, and has the lower end of the first downpipe positioned inside it,
The first downpipe or the second downpipe is a through-member used in a piping structure, which is placed within the through-member and penetrates the bottom .
A first member comprising a first pipe positioned in the through hole, and a first flange extending radially outward from the first pipe and positioned on the upper surface of the bottom,
The second member includes a second pipe positioned at the lower end of the first pipe and below the through hole, and a second flange extending radially outward from the second pipe and positioned on the lower surface of the bottom ,
The first pipe is further provided with a sheath pipe that covers the first pipe from the radial outside and extends upward from the first flange,
The upper end of the aforementioned conduit is a penetrating member located above the upper end of the aforementioned gutter . A gutter with a through hole at the bottom,
A through member fixed to the gutter and positioned in the through hole and passing through the bottom,
It comprises a downpipe that passes through the through member and penetrates the bottom,
The aforementioned downpipe is,
A first downpipe located above the aforementioned eaves gutter,
The system comprises a second downpipe located below the aforementioned gutter, having a larger diameter than the first downpipe and with the lower end of the first downpipe positioned inside it,
The first downpipe or the second downpipe is a through-member used in a piping structure, which is placed within the through-member and penetrates the bottom .
A first member comprising a first pipe positioned in the through hole, and a first flange extending radially outward from the first pipe and positioned on the upper surface of the bottom,
The second member includes a second pipe positioned at the lower end of the first pipe and below the through hole, and a second flange extending radially outward from the second pipe and positioned on the lower surface of the bottom ,
The upper end of the first pipe is a penetrating member located above the upper end of the gutter . A gutter with a through hole at the bottom,
A through member fixed to the gutter and positioned in the through hole and passing through the bottom,
It comprises a downpipe that passes through the through member and penetrates the bottom,
The aforementioned downpipe is,
A first downpipe located above the aforementioned eaves gutter,
The system comprises a second downpipe located below the aforementioned gutter, having a larger diameter than the first downpipe and with the lower end of the first downpipe positioned inside it,
The first downpipe or the second downpipe is a through-member used in a piping structure, which is placed within the through-member and penetrates the bottom .
A first member comprising a first pipe positioned in the through hole, and a first flange extending radially outward from the first pipe and positioned on the upper surface of the bottom,
The second member includes a second pipe positioned at the lower end of the first pipe and below the through hole, and a second flange extending radially outward from the second pipe and positioned on the lower surface of the bottom ,
The first pipe is further provided with a sheath pipe that covers the first pipe from the radial outside and extends upward from the first flange,
The upper end of the aforementioned conduit is a penetrating member located above the upper end of the aforementioned gutter . The through member according to any one of claims 4 to 6, wherein at least one of the first member and the second member is an injection-molded product.