JP2023078609A - Confluent inlet - Google Patents

Abstract

To provide a confluence inlet capable of removing foreign matters from rainwater and allowing rainwater and general drainage to merge while being compact.SOLUTION: A confluent inlet comprises: an inlet-inside space forming part 2 that forms an inlet-inside space S; a rainwater inflow part to which a rainwater channel 3 is connected and where rainwater flows into the inlet-inside space S; and a general wastewater inflow part 6 to which a general wastewater channel 5 is connected and where the general wastewater flows into the inlet-inside space S, wherein the inlet-inside space S comprises an overflow wall 12 that partitions into a rainwater receiving space S1 that has a mud pool 11 and temporarily receives rainwater flowing in from the rainwater inflow part and a confluence space S2 that merges the rainwater flowing out from the rainwater receiving space S1 and general wastewater flowing in from the general wastewater inflow part 6.SELECTED DRAWING: Figure 2

Description

The present invention relates to a confluence pit for merging rainwater and general drainage, and in particular, a pit space forming portion that forms a pit space, and a rainwater inflow portion that is connected to a rainwater channel and allows rainwater to flow into the pit space. and a general wastewater inflow part to which a general wastewater channel is connected and general wastewater flows into the space in the trough.

In Patent Document 1, there are disclosed a box-internal space forming part that forms a box-inside space, a rainwater inflow part (rainwater pipe connecting part 52) to which a rainwater channel (rainwater pipe 51) is connected and rainwater flows into the box-internal space, and a general A confluence box having a general waste water inflow section (inflow pipe connecting section 13A) to which a drainage channel is connected and general waste water (gray water and sewage) flows into the space in the box is shown. In the confluence box of Patent Document 1, rainwater flows into the space inside the box from the rainwater inflow part, and general wastewater flows into the space inside the box from the general wastewater inflow part, so that rainwater and general wastewater merge in the space inside the box. It is designed to

Patent No. 4384475

By the way, rainwater often contains foreign matter such as mud, and a rainwater basin may be provided to remove the foreign matter from the rainwater before joining the rainwater at the joining basin. However, installing the rainwater basin in addition to the confluence basin increases the space for installing these basins. Therefore, there is a demand for a compact confluence pit that can remove foreign matter from rainwater and allow the rainwater and general waste water to merge.

In view of this situation, it is a primary object of the present invention to provide a confluence pit that is compact and can remove foreign matter from rainwater and merge rainwater and general waste water.

A first characteristic configuration of the present invention includes: a box-inside space forming portion that forms a box-inside space; a rainwater inflow portion that is connected to a rainwater channel and rainwater flows into the box-inside space; a general wastewater inflow part through which wastewater flows into the space in the trough, comprising:
A rainwater receiving space having a mud pool and temporarily receiving rainwater flowing in from the rainwater inflow section, and rainwater flowing out from the rainwater receiving space and general wastewater flowing in from the general wastewater inflow section are provided in the space in the box. It is provided with an overflow wall that divides into a merging space for merging.

According to this configuration, the rainwater receiving space and the merging space are separated by the overflow wall, and the rainwater receiving space has a puddle, so that the rainwater flows into the rainwater receiving space from the rainwater inflow part. Foreign matter such as mud can be removed from the rainwater when the rainwater flows over the overflow wall into the confluence space. In addition to the rainwater that has passed over the overflow wall, the general drainage from the general drainage inflow section also flows into the confluence space, so the rainwater and the general drainage can be merged in this confluence space. In this way, the inner space formed by the inner space forming part is partitioned into the rainwater receiving space and the merging space by the overflow wall, so foreign matter such as mud is removed from the rainwater while being compact. In addition, rainwater and general drainage can be merged.

A second characteristic configuration of the present invention is that the rainwater receiving space is provided with a trap for preventing odors generated from the general wastewater flowing into the confluence space from flowing into the rainwater inflow portion.

According to this configuration, the smell of general wastewater is prevented from flowing into the rainwater inflow part by the trap in the rainwater receiving space, so the smell of general wastewater is discharged from the rainwater inflow part to the outside of the space forming part in the trough. can be prevented.

According to a third characteristic configuration of the present invention, the trap is provided with a partition plate installed with a gap upward from the bottom surface of the rainwater receiving space,
The point is that the lower end of the partition plate is positioned below the upper end of the overflow wall.

According to this configuration, the partition plate is installed so that the lower end of the partition plate is located below the upper end of the overflow wall in a state in which the partition plate is spaced upward from the bottom surface of the rainwater receiving space, A trap can be constructed efficiently while forming a mud pool.

In a fourth characteristic configuration of the present invention, the in-box space forming portion includes an outer wall portion surrounding the in-box space and a partition wall portion that divides and forms the rainwater receiving space in the in-box space,
The outer wall portion is made of concrete, and the partition wall portion is made of steel plate.

According to this configuration, by constructing the partition wall portion with a steel plate, it becomes easier to make the merge box compact compared to the case where both the outer wall portion and the partition wall portion are constructed with concrete.

In a fifth characteristic configuration of the present invention, the direction in which the rainwater receiving space and the merging space are arranged in a plan view is the direction of arrangement, and the direction perpendicular to the direction of arrangement in the plan view is a width direction,
The inside-of-the-box space forming part includes a pair of side walls of the box along the row direction, which are spaced apart in the width direction, and the rainwater receiving space and the merging space are provided between the pair of side walls of the box. and forming a general drainage channel connection space extending from directly above the rainwater receiving space to directly above the merging space above the rainwater receiving space and the merging space,
The general drainage inflow part is provided in a portion of the lateral side wall of the trough facing the general drainage channel connection space.

According to this configuration, the general drainage channel connection space exists from just above the rainwater receiving space to just above the confluence space, and general drainage flows into the portion of the side wall of the trough facing this general drainage connection space. By providing the section, the general drainage inflow section can be provided at any position from the upper side of the rainwater receiving space to the upstream side of the merging space, so the degree of freedom in the position of the general drainage inflow section can be increased. can.

In a sixth characteristic configuration of the present invention, the direction in which the rainwater receiving space and the merging space are arranged in a plan view is defined as an alignment direction, and the direction perpendicular to the alignment direction in a plan view is defined as a width direction,
The inside-of-the-box space forming part includes a pair of side walls of the box along the row direction, which are spaced apart in the width direction, and the rainwater receiving space and the merging space are provided between the pair of side walls of the box. to form
The rainwater inflow part and the general waste water inflow part are provided on the same side wall of the pair of the side walls of the box in the same position in a plan view and arranged in the vertical direction.

According to this configuration, the rainwater inflow part and the general drainage inflow part are arranged in the same position in a plan view and arranged in the vertical direction, so that the rainwater inflow part is connected to the rainwater inflow part outside the space forming part in the box. Since the rainwater channel and the general drainage channel connected to the general drainage inflow part can be installed in a vertically aligned state, the installation space for the rainwater channel and the general drainage channel can be saved.

Perspective view of merge box Vertical perspective view of the merge box with the outer wall cover and the compartment cover removed Longitudinal side view of merging box Plan view of the merge box with the outer wall cover and the compartment cover removed

An embodiment of a confluence box according to the present invention will be described based on the drawings.
FIG. 1 is a perspective view of a merging box 1. FIG. FIG. 2 is a longitudinal perspective view of the merging box 1. In FIG. 2, the outer wall cover 23 and the partitioning cover 29 of the merging box 1 shown in FIG. It shows the state of 1 and 2, the general drainage channel 5 is indicated by a dashed line, and the portion of the general drainage channel 5 hidden by the rainwater channel 3 is also shown.
As shown in FIGS. 1 and 2, the merging box 1 is provided with a rectangular parallelepiped box inner space forming part 2 that forms a box inner space S. As shown in FIGS. As shown in FIGS. 1 to 3, the confluence box 1 has a rainwater inflow portion 4 connected to a rainwater channel 3 to allow rainwater to flow into the space S within the box, and a general drainage channel 5 to provide general drainage. A general waste water inflow part 6 that flows into the space S inside the trough is provided. In addition, the merging pit 1 is provided with a merging drainage outflow part 7 for flowing out from the space S in the pit the merged drainage in which rainwater and general drainage are merged. In this embodiment, both miscellaneous wastewater, which is wastewater from kitchens, washbasins, baths, etc., and sewage, which is wastewater from toilets, are treated as general wastewater.

As shown in FIGS. 2 and 3, a rainwater receiving space S1 which has a mud pool 11 and temporarily receives rainwater flowing in from the rainwater inflow part 4, and rainwater flowing out from the rainwater receiving space S1. and a confluence space S2 for merging general waste water flowing in from the general waste water inflow part 6.
In addition, a trap 13 is provided in the rainwater receiving space S1 to prevent the odor caused by the general wastewater flowing into the confluence space S2 from flowing into the rainwater inflow portion 4. As shown in FIG. The trap 13 includes a partition plate 14 that is spaced upward Z1 from the bottom surface of the rainwater receiving space S1. It is located on the lower side Z2.

Therefore, in the merging box 1, the rainwater that has flowed into the box inner space S from the rainwater inflow part 4 is once received by the rainwater receiving space S1 in the box inner space S, and is contained in the rainwater in the rainwater receiving space S1. Foreign matter such as mud sinks into the mud puddle 11, and the supernatant of the rainwater flows over the overflow wall 12 into the confluence space S2. In addition, in the merging box 1, the general waste water that has flowed into the space S inside the pit from the general waste water inflow part 6 flows into the merging space S2 in the space S inside the pit, and crosses the general waste water and the overflow wall 12 in the merging space S2. The inflowing rainwater joins together, and the combined drainage, which is the combined rainwater and general drainage, flows out to the outside through the combined drainage outflow part 7 and a drain pipe (not shown) connected to the combined drainage outflow part 7. It's like

Rainwater at the height of the upper end of the overflow wall 12 is stored in the rainwater receiving space S1, and the lower end of the partition plate 14 is located below the water surface of the rainwater stored in the rainwater receiving space S1. there is Therefore, the odor generated from the general wastewater flowing into the confluence space S2 flows into the rainwater receiving space S1 through a gap (outflow opening 31, which will be described later) formed on the upper side Z1 of the upper end of the overflow wall 12. Since the rainwater stored in the rainwater receiving space S1 is water-sealed, the odor is prevented from flowing into the rainwater inflow portion 4. - 特許庁

Next, a description of the space forming part 2 in the box will be added. In addition, in addition to the explanation of the space forming part 2 in the box, the direction in which the rainwater receiving space S1 and the merging space S2 are arranged in a plan view is defined as an arrangement direction X, and the direction orthogonal to the arrangement direction X in plan view is a width direction Y. described as. Further, one side in the row direction X is called the front side X1, the opposite side is called the rear side X2, one side in the width direction Y is called the right side Y1, and the opposite side is called the left side Y2.

As shown in FIG. 4 , the pit space forming part 2 includes a pair of pit lateral walls 15 along the row direction X, which are spaced apart in the width direction Y, so that rainwater can be collected between the pair of pit lateral walls 15 . A receiving space S1 and a merging space S2 are formed. In addition to the rainwater receiving space S1 and the confluence space S2, the rainwater receiving space S1 and the confluence space S2 are provided between the pair of the box side walls 15 as described above. A general drainage channel connection space S3 (see FIG. 3) extending from just above the rainwater receiving space S1 to just above the merging space S2 is formed in the upper side Z1 of the space S1 and the merging space S2. 4 is a plan view of the merging box 1. In FIG. 4, the outer wall cover 23 and the partitioning cover 29 of the merging box 1 shown in FIG. 1 are removed.

More specifically, as shown in FIGS. 2 to 4, the box inner space forming part 2 includes an outer wall portion 16 surrounding the inner box space S and a section forming a rainwater receiving space S1 in the inner box space S. a wall portion 17; In this embodiment, the outer wall portion 16 is made of concrete. The partition wall portion 17 is made of a steel plate, more specifically, a stainless steel plate. The outer wall portion 16 and the partition wall portion 17 are formed in a rectangular parallelepiped shape. It is composed of a pair of partition side walls 25 .

As shown in FIG. 4, the outer wall portion 16 includes, in addition to the above-described pair of outer wall lateral walls 19, an outer wall front wall 20 and an outer wall rear wall 21 extending in the width direction Y, spaced apart in the direction X. The pair of outer wall lateral walls 19, outer wall front wall 20, and outer wall rear wall 21 form a peripheral wall that is rectangular in plan view. As shown in FIG. 3, the outer wall portion 16 includes an outer wall bottom portion 22 and an outer wall cover so as to cover the upper and lower peripheral walls of the outer wall portion 16 (a pair of outer wall lateral walls 19, an outer wall front wall 20, and an outer wall rear wall 21). It is formed in a rectangular parallelepiped shape as a whole and forms an internal space S inside the box.
As shown in FIGS. 1 and 2, in this embodiment, the pair of outer wall lateral walls 19, the outer wall rear wall 21, and the outer wall bottom portion 22 are integrally formed. The outer wall front wall 20 is detachably provided on the outer wall portion 16, and is configured to be attachable, for example, by inserting it from the upper side Z1 between the ends of the pair of outer wall lateral walls 19 on the front side X1. . The outer wall lid portion 23 is detachably provided on the outer wall portion 16, for example, on the pair of outer wall lateral walls 19, the outer wall front wall 20, and the outer wall rear wall 21 (on the side wall of the outer wall portion 16). It is configured so that it can be mounted so as to be placed on it.

As shown in FIG. 4, the partition wall portion 17 has a front partition wall 26 and a rear partition wall 27 along the width direction Y, in addition to the pair of partition lateral walls 25 described above, which are spaced apart in the direction X. The pair of partition side walls 25, front partition wall 26, and rear partition wall 27 form a peripheral wall that is rectangular in plan view. As shown in FIG. 3, the partition wall portion 17 includes a partition bottom portion 28 and a partition bottom portion 28 so as to cover the upper and lower sides of the peripheral side walls of the partition wall portion 17 (the pair of partition side walls 25, the partition front side wall 26, and the partition rear side wall 27). It is provided with a partition lid portion 29, and is formed in a rectangular parallelepiped shape as a whole to form a rainwater receiving space S1 inside.
As shown in FIGS. 2 and 3, in the present embodiment, the pair of partition side walls 25, the partition front wall 26, the partition rear wall 27, and the partition bottom 28 are integrated by welding or the like. The partition lid portion 29 is detachably provided on the partition wall portion 17, for example, above the pair of partition lateral sidewalls 25, the partition front sidewall 26, and the partition rear sidewall 27 (on the sidewall of the partition wall portion 17). It is configured so that it can be mounted so as to be placed on it.

The partition wall portion 17 is installed in a state in which it is shifted toward the rear side X2 and toward the lower side Z2 in the space S in the box, and is in contact with the outer wall rear wall 21 and the outer wall bottom portion 22 . In addition, the width of the partition wall portion 17 in the width direction Y corresponds to the inner width of the outer wall portion 16 in the width direction Y, and the partition wall portion 17 is in contact with both of the pair of outer wall lateral walls 19. there is By installing the partition wall portion 17 in the trough inner space S in this way, the front side X1 of the partition wall portion 17 in the trough inner space S forms a merging space S2, and the upper part of the merging space S2 in the trout inner space S is formed. A general drainage channel connection space S3 is formed by the side Z1 portion and the upper side Z1 portion of the partition wall portion 17 .

As shown in FIGS. 2 and 3, an outflow opening 31 is formed in the upper portion of the partition front wall 26 for the rainwater in the rainwater receiving space S1 to flow out to the confluence space S2. In this embodiment, the partition front wall 26 is formed at a height lower than the pair of partition lateral walls 25, and a gap is formed between the upper end of the partition front wall 26 and the lower surface of the partition cover portion 29. An outflow opening 31 is formed by the gap. The partition front wall 26 partitions the rainwater receiving space S1 and the confluence space S2, and the rainwater overflowing from the rainwater receiving space S1 flows through the outflow opening 31 into the rainwater receiving space S1. ing. That is, the division front wall 26 functions as an overflow wall 12 that divides the rainwater receiving space S1 and the confluence space S2.

As shown in FIGS. 2 and 3, the rainwater inflow portion 4 is provided at a portion of the pair of lateral side walls 15 of the box facing the rainwater receiving space S1. More specifically, the rainwater inflow portion 4 is provided on one of the pair of side walls 15 of the box (in this embodiment, the side wall 15 on the right side Y1). The rainwater inflow portion 4 is a portion facing the rainwater receiving space S1 in one side wall 15 of the box, and is located on the rear side X2 with respect to the partition plate 14 and on the upper side Z1 from the upper end of the overflow wall 12. are provided. In this embodiment, one partition lateral wall 25 (the partition lateral wall 25 on the right side Y1) of the partition wall portion 17 is formed with an opening on the rear side X2 from the partition plate 14 and on the upper side Z1 from the upper end of the overflow wall 12. At the same time, an opening is formed at the same position in the direction X and the vertical direction Z as the opening of the partition side wall 25 in one of the outer wall side walls 19 of the outer wall portion 16 (the outer wall side wall 19 on the right side Y1), so that the rainwater inflow part 4 is formed.
The rainwater inlet 4 is connected to the rainwater channel 3 installed outside the trough space forming portion 2 . Rainwater from the rainwater channel 3 passes through the rainwater inflow portion 4 and flows directly from the rainwater inflow portion 4 into the rear side X2 of the partition plate 14 in the rainwater receiving space S1. In addition, the rainwater channel 3 is configured by a gutter.

In addition, the partition wall portion 17 is provided with a partition plate 14 having a posture along the width direction Y and the vertical direction Z. As shown in FIG. The partition plate 14 is installed with a space from the bottom surface of the partition bottom portion 28 to the upper side Z1, and a communication opening 32 is formed between the lower end of the partition plate 14 and the upper surface of the partition bottom portion 28. there is
In the rainwater receiving space S1, rainwater is stored up to the height of the upper end of the partition front wall 26, but the lower end of the partition plate 14 is located below the upper end of the partition front wall 26, and the partition plate The lower end of 14 is positioned in the rainwater stored in the rainwater receiving space S1. Therefore, the odor generated from the general wastewater flowing into the confluence space S2 is sealed by the rainwater stored in the rainwater receiving space S1, and the partition plate 14 restricts the flow to the rear side X2 of the partition plate 14. - 特許庁Therefore, this odor is prevented from flowing into the rainwater inflow section 4 provided on the rear side X2 of the partition plate 14 .
In addition, the upper surface of the division bottom part 28 corresponds to the bottom surface of the rainwater receiving space S1. A portion of the partition front wall 26 that forms the lower end of the outflow opening 31 corresponds to the upper end of the overflow wall 12 .

As shown in FIGS. 2 to 4, the general drainage inflow part 6 is provided at a portion of the pair of side walls 15 facing the general drainage channel connection space S3. To add an explanation, the general drainage inflow part 6 is provided in a portion of one of the pair of square side walls 15 (in this embodiment, the square side wall 15 on the right side Y1) facing the general drainage channel connection space S3. ing. In addition, the general wastewater inflow part 6 is provided at the same location as the rainwater inflow part 4 in the alignment direction X on one side wall 15 of the trough. In this embodiment, the general drainage inflow part 6 and the rainwater inflow part 4 are located at the same position in plan view on the same side wall 15 of the pair of side walls 15 (the side wall 15 on the right side Y1), and They are arranged in the vertical direction Z.
The general waste water inflow section 6 is connected to the general drainage channel 5 installed outside the space forming part 2 inside the box, and the drainage channel 34 installed inside the space forming part 2. is connected. General wastewater from the general wastewater channel 5 passes through the general wastewater inflow portion 6 and the in-basket drainage channel 34, and flows into the confluence space S2 from the tip of the in-basin drainage channel 34. - 特許庁Incidentally, the general drainage channel 5 and the in-basket drainage channel 34 are constituted by drainage pipes. Moreover, the general drainage channel 5 is installed on the upper side Z1 of the rainwater channel 3 so as to overlap the rainwater channel 3 in plan view.

In the merge box 1 configured as described above, the merge box space S formed by the merge box space forming part 2 is partitioned by the overflow wall 12 into the rainwater receiving space S1 having the mud pool 11 and the confluence space S2. Due to the compact structure, foreign matter such as mud can be removed from rainwater, and rainwater and general drainage can be merged.

[Another embodiment]
Another embodiment of the present invention will be described. It should be noted that the configuration of each embodiment described below is not limited to being applied alone, and can be applied in combination with the configurations of other embodiments.

(1) In the above-described embodiment, the rainwater inflow part 4 and the general drainage inflow part 6 are aligned in the vertical direction Z on the same side wall 15 of the pair of side walls 15 of the box, at the same position in plan view. has been described as an example. However, it is not limited to such a configuration. For example, the rainwater inflow part 4 and the general drainage in the space forming part 2 can be provided in one of the pair of side walls 15 of the box and the general drainage inflow part 6 in the other side of the pair of side walls 15 of the box. The position of the inflow portion 6 may be changed as appropriate, and the positional relationship between the rainwater inflow portion 4 and the general wastewater inflow portion 6 may be changed as appropriate.

(2) In the above embodiment, the example in which the outer wall portion 16 is made of concrete and the partition wall portion 17 is made of steel plate has been described. However, it is not limited to such a configuration. For example, both the outer wall portion 16 and the partition wall portion 17 are made of a steel plate and the outer wall portion 16 and the partition wall portion 17 are integrally formed, or one or both of the outer wall portion 16 and the partition wall portion 17 may be made of vinyl chloride resin. Further, in the above-described embodiment, the partition wall portion 17 made of a stainless steel plate has been described as an example of the partition wall portion 17 made of a steel plate, but the partition wall portion 17 may be made of a steel plate other than a stainless steel plate. .

(3) In the above-described embodiment, the trap 13 is provided in the rainwater receiving space S1. Further, when the trap 13 is provided in the rainwater receiving space S1, the configuration of the trap 13 may be changed as appropriate.

(4) In the above embodiment, the outer shape of the inner space forming part 2 is a rectangular parallelepiped shape, but the outer shape of the inner space forming part 2 may be changed as appropriate, such as by making the outer shape of the inner space forming part 2 cylindrical. may

1 Combined box 2 Box inner space forming part 3 Rainwater channel 4 Rainwater inflow part 5 General drainage channel 6 General drainage inflow part 11 Mud pool 12 Overflow wall 13 Trap 14 Partition plate 15 Box side wall 16 Outer wall part 17 Division wall part S Box Inner space S1 Rainwater receiving space S2 Merging space S3 General drainage channel connection space X Line direction Y Width direction Z1 Upper side Z2 Lower side

Claims (6)

A trough-interior space forming part that forms a trough-interior space, a rainwater inflow part that is connected to a rainwater channel to allow rainwater to flow into the trough-interior space, and a general drainage channel to be connected to allow general drainage to flow into the trough-interior space. A confluence pit comprising a general wastewater inflow section,
A rainwater receiving space having a mud pool and temporarily receiving rainwater flowing in from the rainwater inflow section, and rainwater flowing out from the rainwater receiving space and general wastewater flowing in from the general wastewater inflow section are provided in the space in the box. A confluence box with an overflow wall that separates it from a confluence space. 2. The confluence pit according to claim 1, wherein said rainwater receiving space is provided with a trap for preventing odors caused by general wastewater flowing into said confluence space from flowing into said rainwater inflow portion. The trap is configured with a partition plate installed with a gap upward from the bottom surface of the rainwater receiving space,
3. The merging pit according to claim 2, wherein the lower end of said partition plate is positioned below the upper end of said overflow wall. The in-box space forming part includes an outer wall portion surrounding the in-box space and a dividing wall portion that partitions and forms the rainwater receiving space in the in-box space,
4. The junction box according to any one of claims 1 to 3, wherein said outer wall portion is made of concrete, and said partition wall portion is made of steel plate. The direction in which the rainwater receiving space and the merging space are arranged in a plan view is defined as an alignment direction, and the direction orthogonal to the alignment direction in a plan view is defined as a width direction,
The inside-of-the-box space forming part includes a pair of side walls of the box along the row direction, which are spaced apart in the width direction, and the rainwater receiving space and the merging space are provided between the pair of side walls of the box. and forming a general drainage channel connection space extending from directly above the rainwater receiving space to directly above the merging space above the rainwater receiving space and the merging space,
5. The confluence box according to any one of claims 1 to 4, wherein the general drainage inflow section is provided in a portion of the side wall of the box facing the general drainage channel connection space. The direction in which the rainwater receiving space and the merging space are arranged in a plan view is defined as an alignment direction, and the direction orthogonal to the alignment direction in a plan view is defined as a width direction,
The inside-of-the-box space forming part includes a pair of side walls of the box along the row direction, which are spaced apart in the width direction, and the rainwater receiving space and the merging space are provided between the pair of side walls of the box. to form
2. The rainwater inflow part and the general drainage inflow part are provided on the same side wall of the pair of side walls of the side wall of the side wall of the side wall of the side wall of the side wall of the side wall of the side wall of the side wall of the side wall of the side wall of the side wall of the side wall. 6. The confluence box according to any one of 5.

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