JP7653343B2 - Inlet and drainage piping system - Google Patents

Description

The present invention relates to a manhole and a drainage piping system. More specifically, the present invention relates to a manhole that can switch the water flow path, and a drainage piping system equipped with a manhole.

Drains capable of switching the drainage flow path have been known for some time. For example, Patent Document 1 discloses a drain that includes a drainage manifold body with an inlet, a first outlet, and a second outlet, and a sealing member capable of sealing either the first outlet or the second outlet. A linear first invert that connects the inlet and the first outlet, and a linear second invert that connects the invert and the second outlet are formed at the bottom of the manifold body.

The sealing member has a cylindrical sealing portion. The sealing member is configured so that when the second outlet is blocked, the sealing portion is fitted into the second invert. At this time, a linear invert is formed by the sealing portion and the first invert, and the inlet and the first outlet are in communication. The sealing member is configured so that when the first outlet is blocked, the sealing portion is fitted into the portion of the first invert on the first outlet side. In this way, an L-shaped invert is formed by the portion of the first invert on the inlet side, the second invert, and the sealing portion, and the inlet and the second outlet are in communication by the L-shaped invert.

Patent No. 6085135

In the drainage manhole disclosed in Patent Document 1, when the sealing member seals the first outlet or the second outlet, the cylindrical sealing portion forms an invert together with the first invert or the second invert. Because the sealing portion is cylindrical, when wastewater flows into the invert, part of which is formed by the sealing portion, there is a risk that the wastewater will stagnate around the sealing portion. Furthermore, when the sealing member seals the first outlet, wastewater flows into the L-shaped invert, so there is a risk that the wastewater will stagnate in the corners of the L-shaped invert.

The present invention was made in consideration of these points, and its purpose is to provide a manhole and drainage piping system that allows water to flow smoothly within the manhole body.

The manhole of the present invention comprises a manhole body having a bottom, a first cylindrical portion provided on a side of the manhole body, a second cylindrical portion provided on a side of the manhole body, a third cylindrical portion provided on a side of the manhole body, a first invert, a second invert, and a closing member. The first invert is provided on the bottom of the manhole body, connects the first cylindrical portion and the second cylindrical portion, and is a groove-shaped portion curved so as to be concave downward. The second invert is provided on the bottom of the manhole body, connects the third cylindrical portion and the first invert, and is a groove-shaped portion curved so as to be concave downward. The closing member is configured to be able to be placed on either the first invert or the second invert, and is able to close either the first cylindrical portion or the third cylindrical portion. The closing member comprises an insertion cylindrical portion and a closing plate portion. The insertion tubular portion has a first end and a second end that is inserted into either the first tubular portion or the third tubular portion. The closure plate portion is provided at the first end so as to close the first end, and is capable of changing its position between a first position and a second position in the circumferential direction relative to the insertion tubular portion. The closure plate portion has a curved surface whose longitudinal cross-sectional shape when the insertion tubular portion is extended laterally is such that it moves away from the insertion tubular portion toward the end of the closure plate portion and is recessed toward the end of the closure plate portion.

According to the above-mentioned measure, for example, when water is made to flow between the first cylindrical portion and the second cylindrical portion, the second end of the insertion cylindrical portion is inserted into the third cylindrical portion, and the third cylindrical portion is closed with the closing member. At this time, the curved surface is arranged along the first invert, and the circumferential position of the closing plate portion relative to the insertion cylindrical portion is adjusted so that a new invert is formed between the curved surface and the first invert, connecting the first cylindrical portion and the second cylindrical portion. Thus, water can be made to flow smoothly along the new invert formed by the curved surface and the first invert. For example, when water is made to flow between the third cylindrical portion and the second cylindrical portion, the second end of the insertion cylindrical portion is inserted into the first cylindrical portion, and the first cylindrical portion is closed with the closing member. At this time, the curved surface is disposed between the second cylindrical portion side portion of the first invert and the second invert, and the circumferential position of the closure plate portion relative to the insertion cylindrical portion is adjusted so that the curved surface, the first invert, and the second invert form a new invert that connects the second cylindrical portion and the third cylindrical portion. Therefore, water can flow smoothly along the new invert formed by the curved surface, the first invert, and the second invert.

According to a preferred embodiment of the present invention, when the closure member is in the first position and closing the third cylindrical portion, the curved surface curves downward along the shape of the first invert, and when the closure member is in the second position and closing the first cylindrical portion, the curved surface curves laterally between the portion of the first invert that is on the second cylindrical portion side and the second invert.

According to the above aspect, when water is allowed to flow between the first cylindrical portion and the second cylindrical portion, the third cylindrical portion is closed by the closing member. At this time, the position of the closing plate portion relative to the inserted cylindrical portion is set to the first position so that the curved surface is curved downward. As a result, the curved surface is arranged along the first invert, and a new invert is formed by the curved surface and the first invert connecting the first cylindrical portion and the second cylindrical portion. Therefore, water can be smoothly flowed along the new invert formed by the curved surface and the first invert. Also, when water is allowed to flow between the third cylindrical portion and the second cylindrical portion, the first cylindrical portion is closed by the closing member. At this time, the position of the closing plate portion relative to the inserted cylindrical portion is set to the second position so that the curved surface is curved to the side. As a result, the curved surface is arranged between the part of the first invert on the second cylindrical portion side and the second invert, and is configured as a curved surface connecting the part of the first invert on the second cylindrical portion side and the second invert. Therefore, a new curved invert is formed by the curved surface, the first invert, and the second invert, connecting the second cylindrical portion and the third cylindrical portion. Therefore, water can flow smoothly along the new invert formed by the curved surface, the first invert, and the second invert.

According to another preferred aspect of the present invention, when the closure member is in the first position and closing the third cylindrical portion, the curved surface curves laterally along the shape of the first invert, and when the closure member is in the second position and closing the first cylindrical portion, the curved surface curves laterally between the portion of the first invert that is on the second cylindrical portion side and the second invert.

According to the above aspect, when water is allowed to flow between the first cylindrical portion and the second cylindrical portion, the third cylindrical portion is closed by the closing member. At this time, the position of the closing plate portion relative to the inserted cylindrical portion is set to the first position so that the curved surface is curved to the side. As a result, the curved surface is arranged along the first invert, and a new curved invert is formed by the curved surface and the first invert connecting the first cylindrical portion and the second cylindrical portion. Therefore, water can be smoothly flowed along the new invert formed by the curved surface and the first invert. Also, when water is allowed to flow between the third cylindrical portion and the second cylindrical portion, the first cylindrical portion is closed by the closing member. At this time, the position of the closing plate portion relative to the inserted cylindrical portion is set to the second position so that the curved surface is curved to the side. As a result, the curved surface is arranged between the part of the first invert on the second cylindrical portion side and the second invert, and is configured as a curved surface connecting the part of the first invert on the second cylindrical portion side and the second invert. Therefore, a new curved invert is formed by the curved surface, the first invert, and the second invert, connecting the second cylindrical portion and the third cylindrical portion. Therefore, water can flow smoothly along the new invert formed by the curved surface, the first invert, and the second invert.

According to another preferred embodiment of the present invention, the closure plate portion is configured to be detachable from the insertion tube portion.

According to the above aspect, when changing the circumferential position of the closure plate portion relative to the insertion tubular portion, the closure plate portion can be removed from the insertion tubular portion, making it easy to change the circumferential position of the closure plate portion relative to the insertion tubular portion.

According to another preferred aspect of the present invention, the closure member is provided on the surface of the closure plate portion facing the insertion tubular portion so as to be positioned within the insertion tubular portion, and is provided with a closure grip portion that can be gripped by an operator.

According to the above aspect, an operator can grasp the closing grip portion to change the circumferential position of the closure plate portion. Since the closing grip portion is provided on the surface of the closure plate portion facing the insertion tubular portion, for example, when wastewater flows through the manhole body, the closing grip portion is less likely to get wet with the wastewater. Therefore, when an operator grasps the closing grip portion, the operator's hands are less likely to get dirty with wastewater.

The drainage piping system according to the present invention comprises any one of the above manholes, an inflow pipeline connected to the first cylindrical section of the manhole and through which drainage flows in, a water supply means connected to the third cylindrical section of the manhole and for supplying water to the manhole, and an outflow pipeline connected to the second cylindrical section of the manhole and through which drainage flows out.

According to the drainage piping system, for example, by closing the third cylindrical portion of the manhole with a closing member, drainage water can be made to flow from the inlet pipe to the outlet pipe. Also, for example, by closing the first cylindrical portion of the manhole with a closing member, water can be made to flow from the water supply means to the outlet pipe. Therefore, by changing the position of the closing member of the manhole, water can be made to flow smoothly while easily switching the water flow path.

The drainage piping system of the present invention includes any one of the above manholes, an inlet pipeline connected to the second cylindrical section of the manhole and through which drainage flows in, an outlet pipeline connected to the first cylindrical section of the manhole and through which drainage flows out, and a storage tank connected to the third cylindrical section of the manhole.

According to the drainage piping system, for example, by closing the third cylindrical portion of the manhole with a closing member, drainage can be made to flow from the inlet pipe to the outlet pipe. Also, for example, by closing the first cylindrical portion of the manhole with a closing member, drainage can be made to flow from the inlet pipe to the storage tank. Therefore, by changing the position of the closing member of the manhole, drainage can be made to flow smoothly while easily switching the drainage flow path.

The present invention provides a manhole and drainage piping system that allows water to flow smoothly within the manhole body.

FIG. 2 is a perspective view of a measuring cup according to the first embodiment. FIG. 1 is a plan view showing a schematic diagram of a drainage piping system equipped with a manhole. FIG. 2 is a front view showing a schematic diagram of the drainage piping system. FIG. 2 is a front view showing a schematic diagram of the drainage piping system. 13 is a plan view of the bucket, showing the state in which the closing member closes the third cylindrical portion. FIG. 13 is a plan view of the bucket, showing the state in which the closing member closes the first cylindrical portion. FIG. 7 is a cross-sectional view of the measuring cup taken along the line VII-VII of FIG. 5. 8 is a cross-sectional view of the measuring cup taken along the line VIII-VIII in FIG. 6. FIG. 13 is a view showing the closure member as viewed from the closure plate portion side. FIG. 4 is a plan view of the closure member, showing a state in which the closure plate portion is disposed in a first position. FIG. 13 is a plan view of the closure member, showing the closure plate portion in a second position; FIG. 13 is a cross-sectional view of the closing member taken along line XIII-XIII of FIG. 11. 14 is a cross-sectional view of the closing member taken along the line XIV-XIV in FIG. 12. 13 is a view showing a first recess of the insertion tube portion. FIG. FIG. 4 is a plan view showing a schematic diagram of a drainage piping system according to a modified example of the first embodiment. FIG. 11 is a plan view of the bucket according to the second embodiment, showing the state in which the closing member closes the third cylindrical portion. FIG. 11 is a plan view of the bucket according to the second embodiment, showing the state in which the closing member closes the first cylindrical portion.

One embodiment of the present invention will be described below with reference to the drawings. However, the embodiment described below is merely one embodiment of the present invention, and is not intended to limit the present invention. In addition, the same reference numerals are used for components and parts that perform the same function, and duplicate descriptions will be omitted or simplified as appropriate.

First Embodiment
FIG. 1 is a perspective view of a manhole 30 according to the first embodiment. The manhole 30 is an object through which water flows. In this embodiment, the manhole 30 is capable of switching the flow path of the water. Here, "water" includes so-called wastewater in addition to relatively clean water. "Wastewater" includes sewage and rainwater. "Sewage" is water discharged from toilets, bathtubs, kitchen sinks, etc., and cannot be discharged into rivers as it is. "Rainwater" is water resulting from natural phenomena such as rainfall, and can be discharged into rivers as it is.

Figure 2 is a plan view showing the drainage piping system 1. Figures 3 and 4 are front views showing the drainage piping system 1. In this embodiment, as shown in Figure 2, the drainage piping system 1 is provided with a manhole 30. The drainage piping system 1 is a system that normally discharges wastewater from a drainage facility 6 in a building 5 toward a main sewer pipe 8. The drainage facility 6 is a facility that discharges wastewater such as sewage, such as a toilet, a bathtub, or a kitchen sink. In the event of a disaster such as an earthquake, the drainage piping system 1 is used as a system in which a temporary toilet 4 is installed, as shown in Figure 4, and uses flushing water discharged from a water supply tank 20 (see Figure 2) to discharge wastewater discharged from the temporary toilet 4 into the main sewer pipe 8, etc.

In this embodiment, the manhole 30 switches the water flow path so that wastewater discharged from the drainage equipment 6 flows during normal times, and flushing water discharged from the water supply tank 20 flows during a disaster.

In the following description, water flows from upstream to downstream. Here, the upstream side refers to the drainage equipment 6 side or the water supply tank 20 side. The downstream side refers to the sewer main pipe 8 side.

As shown in FIG. 2, the drainage piping system 1 includes a flushing water inlet pipeline 10, a drainage inlet pipeline 11, and an outlet pipeline 12. Here, the "pipe" may be composed of a single pipe, or may be composed of multiple pipes, joints connecting the pipes, and a manhole. The "pipe" may be straight, or may be partially curved.

The flushing water inlet pipeline 10, the wastewater inlet pipeline 11, and the outlet pipeline 12 are buried underground. The flushing water inlet pipeline 10 is a pipeline that directs flushing water in the water supply tank 20 to the outlet pipeline 12. The upstream end of the flushing water inlet pipeline 10 is connected to the water supply tank 20, and the downstream end of the flushing water inlet pipeline 10 is connected to the outlet pipeline 12 via a manhole 30.

The water supply tank 20 stores water for cleaning the inside of the outflow pipe 12. The water stored in the water supply tank 20 may be rainwater or relatively clean water that is free of foreign matter.

An opening/closing gate 21 may be provided in the middle of the cleaning water inlet pipe 10. The opening/closing gate 21 opens and closes the cleaning water inlet pipe 10. Although not shown, the opening/closing gate 21 has, for example, an opening/closing valve that can open and close the cleaning water inlet pipe 10. When the opening/closing gate 21 opens the cleaning water inlet pipe 10, the cleaning water in the water supply tank 20 flows into the outlet pipe 12. When the opening/closing gate 21 closes the cleaning water inlet pipe 10, the cleaning water in the water supply tank 20 stops flowing into the outlet pipe 12.

The wastewater inlet pipeline 11 is a pipeline that flows wastewater discharged from the wastewater equipment 6 to the outlet pipeline 12. In this embodiment, multiple drainage equipment 6 are connected to the middle of the wastewater inlet pipeline 11. Here, the drainage equipment 6 is connected to the wastewater inlet pipeline 11 via a connecting pipe 24. The number of drainage equipment 6 connected to the wastewater inlet pipeline 11 is not particularly limited, and is five in this embodiment. The downstream end of the wastewater inlet pipeline 11 is connected to the outlet pipeline 12 via a manhole 30.

The outflow pipe 12 is provided downstream of the flush water inlet pipe 10 and the wastewater inlet pipe 11. The upstream end of the outflow pipe 12 is connected to the flush water inlet pipe 10 and the wastewater inlet pipe 11 via a manhole 30. The downstream end of the outflow pipe 12 is connected to the main sewer pipe 8.

In this embodiment, as shown in FIG. 4, the outflow pipeline 12 is configured so that the toilet bowls 4a of multiple temporary toilets 4 can be attached. Here, a vertically extending standpipe 25 is connected to the middle of the outflow pipeline 12. The standpipe 25 extends upward from the outflow pipeline 12 and opens upward. In the event of a disaster, the standpipe 25 can be connected to the toilet bowls 4a of the temporary toilets 4. Note that the number of standpipes 25 connected to the outflow pipeline 12, in other words, the number of temporary toilets 4 that can be attached to the outflow pipeline 12, is not particularly limited. Here, the number of standpipes 25 is three, and three temporary toilets 4 can be attached to the outflow pipeline 12.

In this embodiment, a storage tank 28 is connected to the middle of the outflow pipeline 12, downstream of the standpipe 25. The storage tank 28 is a tank that stores wastewater discharged from, for example, the temporary toilet 4. The storage tank 28 has a sealed space inside. Since the storage tank 28 is sealed, it is possible to prevent the bad odor generated from the wastewater in the storage tank 28 from leaking to the outside. In this embodiment, the storage tank 28 is buried underground.

The storage tank 28 is connected to the outflow pipeline 12 via a so-called switching chute 29. The switching chute 29 is located in the middle of the outflow pipeline 12, downstream of the standpipe 25. The switching chute 29 is capable of switching the water flow path. The configuration of this switching chute 29 is not particularly limited. Although a detailed explanation is omitted, the switching chute 29 is configured to be able to switch the water flow path between a first switching state in which the water that has flowed into the switching chute 29 is caused to flow into the main sewer pipe 8, and a second switching state in which the water that has flowed into the switching chute 29 is caused to flow into the storage tank 28.

In addition, a backflow prevention means (e.g., a check valve equipped check valve) or a public check valve may be provided in the downstream portion of the outflow pipeline 12 from the switching check valve 29.

Next, the manhole 30 according to this embodiment will be described in detail. In this embodiment, as shown in FIG. 2, the manhole 30 is provided between the flushing water inlet pipe 10 and the outlet pipe 12 of the drainage piping system 1, and between the drainage water inlet pipe 11 and the outlet pipe 12. The manhole 30 is capable of switching the water flow path so that, under normal circumstances, the drainage water flowing from the drainage equipment 6 to the flushing water inlet pipe 11 flows into the outlet pipe 12, and in the event of a disaster, the flushing water flowing from the water supply tank 20 to the flushing water inlet pipe 10 flows into the outlet pipe 12.

Figures 5 and 6 are plan views of the manhole 30. Figures 7 and 8 are cross-sectional views of the manhole 30 taken along the VII-VII section of Figure 5 and the VIII-VIII section of Figure 6, respectively. As shown in Figure 5, the manhole 30 includes a manhole body 31, a first cylindrical portion 36, a second cylindrical portion 37, a third cylindrical portion 38, a first invert 41, a second invert 42 (see Figure 6), and a closing member 50. The manhole body 31 has a space inside. As shown in Figure 7, the manhole body 31 is a bottomed cylindrical body. The shape of the manhole body 31 is not particularly limited, but may be, for example, substantially cylindrical. In this embodiment, an inspection hatch 40 that opens upward is formed at the top of the manhole body 31. A vertical pipe 39 (see Figure 3) extending upward is connected to the inspection hatch 40.

As shown in FIG. 5, the first cylindrical portion 36, the second cylindrical portion 37, and the third cylindrical portion 38 are portions where water flows into the bucket body 31, or where water flows out from the bucket body 31. In this embodiment, the first cylindrical portion 36 and the third cylindrical portion 38 function as inlet cylindrical portions where water flows into the bucket body 31. The second cylindrical portion 37 functions as an outlet cylindrical portion where water flows out from the bucket body 31. In this embodiment, the first cylindrical portion 36 is connected to a drainage inlet pipe 11 connected to the drainage equipment 6. The second cylindrical portion 37 is connected to an outlet pipe 12. The third cylindrical portion 38 is connected to a flushing water inlet pipe 10 connected to a water supply tank 20.

The first cylindrical portion 36, the second cylindrical portion 37, and the third cylindrical portion 38 are provided on the side of the manhole main body 31. The first cylindrical portion 36, the second cylindrical portion 37, and the third cylindrical portion 38 are cylindrical, and more specifically, straight and substantially cylindrical. However, the shapes of the first cylindrical portion 36, the second cylindrical portion 37, and the third cylindrical portion 38 are not particularly limited. The first cylindrical portion 36, the second cylindrical portion 37, and the third cylindrical portion 38 may be formed of a single tube, or may be formed by connecting multiple tubes.

In this embodiment, the first cylindrical portion 36 and the second cylindrical portion 37 face each other across the center C31 of the manhole body 31 in a plan view. In a plan view, the axis L36 of the first cylindrical portion 36 passes through the center C31 of the manhole body 31, and the axis L37 of the second cylindrical portion 37 also passes through the center C31 of the manhole body 31. In a plan view, the axis L36 of the first cylindrical portion 36 and the axis L37 of the second cylindrical portion 37 coincide with each other. However, the axis L36 of the first cylindrical portion 36 may be inclined with respect to the axis L37 of the second cylindrical portion 37.

The third cylindrical portion 38 is provided between the first cylindrical portion 36 and the second cylindrical portion 37 in the axial direction of the first cylindrical portion 36 in a plan view. Here, the axis L38 of the third cylindrical portion 38 intersects with the axis L36 of the first cylindrical portion 36 and also intersects with the axis L37 of the second cylindrical portion 37. In more detail, the axis L38 is perpendicular to the axis L36 and also perpendicular to the axis L37. In a plan view, the axis L38 of the third cylindrical portion 38 passes through the center C31 of the manhole main body 31.

As shown in FIG. 6, the first invert 41 and the second invert 42 are grooves provided at the bottom of the manhole body 31. As shown in FIG. 5, the first invert 41 connects the first cylindrical portion 36 and the second cylindrical portion 37. The shape of the first invert 41 is not particularly limited, but as shown in FIG. 7, in this embodiment, it is a semi-tubular shape. The first invert 41 is a groove shape curved so as to be concave downward. Also, as shown in FIG. 5, the first invert 41 has a shape that extends in a straight line from the first cylindrical portion 36 to the second cylindrical portion 37. In this embodiment, the axis L41 of the first invert 41 coincides with the axis L36 of the first cylindrical portion 36 and coincides with the axis L37 of the second cylindrical portion 37. However, the axis L41 of the first invert 41 may be inclined with respect to the axis L36 or the axis L37.

As shown in FIG. 6, the second invert 42 connects the third cylindrical portion 38 and the first invert 41. In this embodiment, the second invert 42 is connected to the central portion of the first invert 41 in the axial direction. The shape of the second invert 42 is not particularly limited, but in this embodiment, it is a semi-tubular shape. The second invert 42 is a groove shape curved so as to be concave downward, similar to the first invert 41. In addition, the second invert 42 has a shape that extends in a straight line from the third cylindrical portion 38 to the first invert 41. In this embodiment, as shown in FIG. 5, the axis L42 of the second invert 42 intersects with the axis L41 of the first invert 41, and also intersects with the axis L36 of the first cylindrical portion 36 and the axis L37 of the second cylindrical portion 37. Specifically, the axis L42 of the second invert 42 is perpendicular to the axes L41, L36, and L37. In a plan view, the axis L42 of the second invert 42 passes through the center C31 of the main body 31 and coincides with the axis L38 of the third cylindrical portion 38.

As shown in FIG. 5 and FIG. 6, the closing member 50 can selectively close either the first cylindrical portion 36 or the third cylindrical portion 38. In this embodiment, the closing member 50 is configured to be placed on either the first invert 41 or the second invert 42. The closing member 50 can be fitted to either the first invert 41 or the second invert 42. When closing either the first cylindrical portion 36 or the third cylindrical portion 38, the closing member 50 is configured to form, together with the first invert 41 or the second invert 42, a new invert connecting the first cylindrical portion 36 and the second cylindrical portion 37, or a new invert connecting the second cylindrical portion 37 and the third cylindrical portion 38.

Figure 9 is a perspective view of the closure member 50. Figure 10 is a view showing the closure member 50 as viewed from the closure plate portion 52 side. Figures 11 and 12 are plan views of the closure member 50. Figures 13 and 14 are cross-sectional views of the closure member 50 taken along the lines XIII-XIII in Figure 11 and XIV-XIV in Figure 12, respectively.

As shown in FIG. 9, the closure member 50 includes an insertion tubular portion 51, a closure plate portion 52, a closure grip portion 53, an abutment portion 54, and a grip portion 55. As shown in FIG. 7 and FIG. 8, the insertion tubular portion 51 is a portion that is inserted into either the first tubular portion 36 or the third tubular portion 38. The insertion tubular portion 51 is cylindrical. Here, "cylindrical" also includes a portion having a slit or the like formed therein. The insertion tubular portion 51 has a first end portion 61 and a second end portion 62 that is inserted into either the first tubular portion 36 or the third tubular portion 38. Here, the second end portion 62 fits into either the first tubular portion 36 or the third tubular portion 38. The second end portion 62 has a shape that corresponds to the shape of the inner circumferential surface of the first tubular portion 36 and a shape that corresponds to the shape of the inner circumferential surface of the third tubular portion 38. The second end 62 is shaped to make annular contact with the inner circumferential surface of the first cylindrical portion 36 when inserted into the first cylindrical portion 36, and to make annular contact with the inner circumferential surface of the third cylindrical portion 38 when inserted into the third cylindrical portion 38.

In this embodiment, as shown in FIG. 13, a seal member 63 is provided on the outer circumferential surface of the second end 62 of the insertion tubular portion 51. The seal member 63 can increase the adhesion between the insertion tubular portion 51 and the first tubular portion 36, and between the insertion tubular portion 51 and the third tubular portion 38. As shown in FIG. 9, the seal member 63 is ring-shaped and is provided so as to surround the second end 62 along the circumferential direction of the second end 62. The material of the seal member 63 is not particularly limited, but the seal member 63 is formed of an elastic body. An example of the elastic body is rubber.

As shown in FIG. 13, the closure plate portion 52 is provided at the first end portion 61 of the insertion tubular portion 51 so as to close the first end portion 61. As shown in FIG. 8, when the insertion tubular portion 51 is inserted into the first tubular portion 36, the closure plate portion 52 serves as a portion that prevents water from flowing through the first tubular portion 36. As shown in FIG. 7, when the insertion tubular portion 51 is inserted into the third tubular portion 38, the closure plate portion 52 serves as a portion that prevents water from flowing through the third tubular portion 38.

In this embodiment, as shown in FIG. 13, the closure plate portion 52 has a curved surface 71. As shown in FIG. 5 and FIG. 6, the curved surface 71 is configured to form a new invert connecting the first cylindrical portion 36 and the second cylindrical portion 37, or a new invert connecting the second cylindrical portion 37 and the third cylindrical portion 38 together with the first invert 41 or the second invert 42. As shown in FIG. 13, the curved surface 71 forms a part of the surface of the closure plate portion 52 opposite to the insertion cylindrical portion 51. The curved surface 71 is a surface that is away from the insertion cylindrical portion 51 as it approaches a part of the edge of the closure plate portion 52 (the lower edge in FIG. 13) and is recessed toward a part of the edge of the closure plate portion 52 (the lower edge in FIG. 13). In other words, the cross-sectional shape of the curved surface 71 when the insertion tubular portion 51 extends laterally is such that it moves away from the insertion tubular portion 51 toward the end of the closure plate portion 52 (the lower end in FIG. 13) and is concave toward the closure plate portion 52 (the lower end in FIG. 13). As shown in FIG. 14, the curved surface 71 has a tapered shape toward the center of the curved surface 71. The width of the curved surface 71 decreases as it moves away from the insertion tubular portion 51. The shape of the curved surface 71 in a plan view is triangular.

In this embodiment, the closure plate portion 52 has an outer tubular portion 73. The outer tubular portion 73 is a tubular portion extending from the closure plate portion 52 toward the insertion tubular portion 51. An inwardly recessed step 74 is formed on the outer circumferential surface of the outer tubular portion 73. The step 74 of the outer tubular portion 73 is fitted into the first end portion 61 of the insertion tubular portion 51.

A seal member 75 is provided on the outer peripheral surface of the outer cylindrical portion 73. Here, the seal member 75 is provided between the step 74 and the first end 61 of the insertion cylindrical portion 51. The seal member 75 can increase the adhesion between the outer cylindrical portion 73 and the insertion cylindrical portion 51. The seal member 75 is ring-shaped and is provided along the circumferential direction of the outer cylindrical portion 73. The material of the seal member 75 is not particularly limited. Here, the seal member 75 is formed of the same elastic material as the above-mentioned seal member 63, for example, rubber.

In this embodiment, the closure plate portion 52 is configured to be detachable from the insertion tubular portion 51. The closure plate portion 52 is configured to be able to change its position in the circumferential direction relative to the first end portion 61 of the insertion tubular portion 51. The closure plate portion 52 is configured to be able to rotate in the circumferential direction relative to the insertion tubular portion 51. Here, by changing the circumferential position of the closure plate portion 52 relative to the insertion tubular portion 51, the position of the outer tubular portion 73 is also changed in the circumferential direction relative to the insertion tubular portion 51. By changing the circumferential position of the closure plate portion 52, the position of the curved surface 71 is also changed.

The closure plate portion 52 is configured to be able to change its position between a first position P1 (see FIG. 11) and a second position P2 (see FIG. 12) in the circumferential direction relative to the insertion tubular portion 51. Here, the first position P1 is the circumferential position of the closure plate portion 52 relative to the insertion tubular portion 51 when the curved surface 71 is located at the height of the lower part of the insertion tubular portion 51, as shown in FIG. 13. At the first position P1, the curved surface 71 is curved so as to be concave toward the bottom and to move away from the insertion tubular portion 51 as it goes downward. The second position P2 is the circumferential position of the closure plate portion 52 relative to the insertion tubular portion 51 when the curved surface 71 is located at the height of the side of the insertion tubular portion 51, as shown in FIG. 14. At the second position P2, the curved surface 71 is curved so as to be concave toward the outside of the side, as shown in FIG. 12.

In this embodiment, as shown in FIG. 10, the closing member 50 includes a first locking means 76 and a second locking means 77. The first locking means 76 fixes the position of the closing plate portion 52 at the first position P1. The second locking means 77 fixes the position of the closing plate portion 52 at the second position P2. Note that the specific configurations of the first locking means 76 and the second locking means 77 are not particularly limited.

In this embodiment, as shown in FIG. 13, the outer cylindrical portion 73 of the closure plate portion 52 is provided with protrusions 78 that protrude radially outward from the outer peripheral surface of the outer cylindrical portion 73. The number of protrusions 78 is not particularly limited. In this embodiment, two protrusions 78 are provided so as to face each other across the axis of the outer cylindrical portion 73.

In this embodiment, the first locking means 76 is a first recess 76a formed in the first end 61 of the insertion tubular portion 51. The second locking means 77 is a second recess 77a (see FIG. 10) formed in the first end 61 of the insertion tubular portion 51. Here, the specific shape of the second recess 77a is not shown, but it has the same shape as the first recess 76a. Here, as shown in FIG. 13, the first recess 76a is a portion that engages with the protrusion 78 of the closure plate portion 52 when the closure plate portion 52 is in the first position P1. In this embodiment, when in the first position P1, the two protrusions 78 are positioned at the height of the upper and lower parts of the insertion tubular portion 51. Therefore, as shown in FIG. 13, the first recess 76a is formed at the height of the upper and lower parts of the insertion tubular portion 51 at the first end 61. Two first recesses 76a are formed so as to face each other across the axis of the insertion tubular portion 51.

The second recess 77a is a portion that engages with the protrusion 78 of the closure plate portion 52 when the closure plate portion 52 is in the second position P2. In this embodiment, when the closure plate portion 52 is in the second position P2, the two protrusions 78 are positioned at the height of the side of the insertion tubular portion 51. Therefore, as shown in FIG. 10, the second recesses 77a are each formed at the height of the side of the insertion tubular portion 51 at the first end portion 61. Two second recesses 77a are formed to face each other across the axis of the insertion tubular portion 51.

In this embodiment, as described above, the shapes of the first recess 76a and the second recess 77a are the same. The shape of the first recess 76a will be described in detail below. FIG. 15 is a diagram showing a state in which the protrusion 78 of the closure plate portion 52 is engaged with the first recess 76a. As shown in FIG. 15, the first recess 76a has a passage 79a extending from the end of the first end 61 toward the second end 62 side (to the right in FIG. 15), and a peripheral recess 79b extending from the passage 79a in the circumferential direction (upward in FIG. 15). Here, for example, when the closure plate portion 52 is placed at the first position P1, the protrusion 78 of the closure plate portion 52 is passed through the passage 79a of the first recess 76a, and the closure plate portion 52 is rotated in the circumferential direction relative to the insertion cylindrical portion 51, so that the protrusion 78 fits into the peripheral recess 79b. This allows the closure plate portion 52 to be fixed at the first position P1.

The closure grip 53 shown in FIG. 9 is a portion that can be grasped by an operator, and is a portion that uses the closure grip 53 to change the circumferential position of the closure plate portion 52. As shown in FIG. 13, the closure grip 53 is provided on the surface of the closure plate portion 52 facing the insertion cylindrical portion 51 so as to be positioned within the insertion cylindrical portion 51. The closure grip 53 is connected to the closure plate portion 52 so that its circumferential position can be changed together with the closure plate portion 52.

In this embodiment, the surface of the closure plate 52 facing the insertion tubular portion 51 is provided with an inner tubular portion 72 that extends toward the insertion tubular portion 51. The inner tubular portion 72 is provided inside the outer tubular portion 73. The closure grip portion 53 is fitted into the inner tubular portion 72.

As shown in FIG. 14, the shape of the closing grip portion 53 is T-shaped, but is not particularly limited to this. Here, the closing grip portion 53 has a closing rod-shaped portion 81 and a closing grip portion 82. The closing rod-shaped portion 81 is fitted into the inner tubular portion 72. The closing rod-shaped portion 81 extends from the closing plate portion 52 toward the inside of the insertion tubular portion 51. The closing rod-shaped portion 81 extends toward the second end 62 of the insertion tubular portion 51 beyond the outer tubular portion 73. The closing grip portion 82 is a portion that the operator holds with his/her hand. The closing grip portion 82 is provided at the end of the closing rod-shaped portion 81 and extends in a direction intersecting the axial direction of the closing rod-shaped portion 81, i.e., in the radial direction.

As shown in Figures 7 and 8, the abutment portion 54 is a portion that abuts against the inner peripheral surface of the manhole main body 31 when the insertion tubular portion 51 is inserted into either the first tubular portion 36 or the third tubular portion 38. As shown in Figure 13, the abutment portion 54 extends from the first end 61 toward the second end 62 of the insertion tubular portion 51. As shown in Figure 6, a portion of the abutment portion 54 is curved along the inner peripheral surface of the manhole main body 31 in a plan view. Here, the abutment portion 54 is curved so as to be convex toward the inner peripheral surface of the manhole main body 31.

In this embodiment, as shown in FIG. 13, the abutment portion 54 has an inclined surface 58. The inclined surface 58 is a flat surface that is inclined upward from the first end 61 to the second end 62 of the insertion tube portion 51.

The grip portion 55 is a portion that can be gripped by an operator. By gripping and operating the grip portion 55, an operator can open and close the first cylindrical portion 36 and the third cylindrical portion 38 with the closure member 50. The grip portion 55 is provided on the upper portion of the insertion cylindrical portion 51 via the abutment portion 54. Here, the abutment portion 54 is provided with a cylindrical connecting cylindrical portion 59 that extends upward. The grip portion 55 is fitted into the connecting cylindrical portion 59.

As shown in FIG. 12, the grip portion 55 is formed, for example, in a T-shape, but the shape of the grip portion 55 is not particularly limited. The configuration of the grip portion 55 is also not particularly limited. In this embodiment, as shown in FIG. 13, the grip portion 55 has a first rod-shaped portion 91, a second rod-shaped portion 92, and a grip portion 93. The first rod-shaped portion 91 is fitted into the connecting tubular portion 59. The first rod-shaped portion 91 extends upward from the insertion tubular portion 51. The second rod-shaped portion 92 is connected to the upper end of the first rod-shaped portion 91 and extends obliquely from the first rod-shaped portion 91. In more detail, the second rod-shaped portion 92 extends obliquely upward so as to move away from the insertion tubular portion 51 as it moves away from the first rod-shaped portion 91.

The grip portion 93 is a portion that an operator holds with his/her hand. The grip portion 93 is, for example, rod-shaped. The grip portion 93 is disposed on the opposite side of the first end 61 of the insertion tubular portion 51 from the second end 62. In a plan view, the grip portion 93 is disposed closer to the center of the main body 31 than the first end 61. Here, the grip portion 93 is connected to the upper end of the second rod-shaped portion 92. The grip portion 93 has a rod-like shape that extends radially from the second rod-shaped portion 92.

The material that mainly forms the manhole 30, i.e., the material that forms the manhole body 31, the first cylindrical portion 36, the second cylindrical portion 37, the third cylindrical portion 38, and the closing member 50, is not particularly limited. The material that forms the manhole body 31, the first cylindrical portion 36, the second cylindrical portion 37, the third cylindrical portion 38, and the closing member 50 is, for example, a resin material. Examples of the resin material include polyvinyl chloride resin and polypropylene resin. Among polyvinyl chloride resins, rigid polyvinyl chloride resin can be preferably used.

The above describes the configuration of the manhole 30 according to this embodiment. Next, a method of using the manhole 30 will be described. As shown in FIG. 2, in the drainage piping system 1, under normal circumstances, wastewater such as sewage discharged from the drainage equipment 6 flows from the drainage inlet pipe 11 toward the outlet pipe 12 and is discharged into the sewer main 8. To allow the wastewater to flow from the drainage inlet pipe 11 to the outlet pipe 12, the third cylindrical portion 38 in the manhole 30 is closed with a closing member 50 as shown in FIG. 5.

In this embodiment, when the third cylindrical portion 38 is closed by the closing member 50, the closing plate portion 52 is set to the first position P1. That is, the circumferential position of the closing plate portion 52 relative to the insertion cylindrical portion 51 is adjusted so that the curved surface 71 of the closing plate portion 52 is curved downwardly and concavely. Here, the operator holds the closing grip portion 82 of the closing grip portion 53 with his/her hand, and as shown in FIG. 15, the protrusion 78 of the closing plate portion 52 is engaged with the first recess 76a of the insertion cylindrical portion 51. This allows the closing plate portion 52 to be fixed at the first position P1. After that, the operator holds the grip portion 93 of the grip portion 55 of the closing member 50 with his/her hand, as shown in FIG. 7, and inserts the insertion cylindrical portion 51 of the closing member 50 into the third cylindrical portion 38. This allows the closing plate portion 52 to close the third cylindrical portion 38. Here, when the third cylindrical portion 38 is closed by the closing member 50, the position of the closing plate portion 52 is set to the first position P1, so that the curved surface 71 located at the lower portion of the insertion cylindrical portion 51, together with the first invert 41, can form a new linear invert extending from the first cylindrical portion 36 to the second cylindrical portion 37, as shown in FIG. 5.

In this embodiment, under normal circumstances, wastewater discharged from the drainage equipment 6 flows from the wastewater inlet pipe 11 to the first cylindrical section 36 and into the manhole body 31 of the manhole 30. In the manhole body 31, the wastewater flows into the second cylindrical section 37 through a new invert formed by the first invert 41 and the curved surface 71 of the closure plate section 52. The wastewater then flows out of the manhole body 31 from the second cylindrical section 37 and into the outflow pipe 12. The wastewater flowing through the outflow pipe 12 is discharged into the sewer main pipe 8.

In the event of a disaster, as shown in FIG. 4, the drainage piping system 1 is used as a system in which a temporary toilet 4 is installed, and the wastewater discharged from the temporary toilet 4 is discharged to the sewer main pipe 8 using flushing water discharged from the water supply tank 20 (see FIG. 2). For example, when the sewer main pipe 8 is damaged, the flow path is switched at the switching manhole 29, and the wastewater discharged from the temporary toilet 4 is discharged to the storage tank 28. In the event of a disaster, flushing water in the water supply tank 20 is caused to flow from the flushing water inlet pipe 10 to the outlet pipe 12, and is discharged to the sewer main pipe 8 or the storage tank 28 together with the wastewater discharged from the temporary toilet 4 connected to the outlet pipe 12. Here, in order to flow flushing water from the flushing water inlet pipe 10 to the outlet pipe 12, the first cylindrical portion 36 is closed by the closing member 50 in the manhole 30, as shown in FIG. 6.

In this embodiment, when the first cylindrical portion 36 is closed by the closing member 50, the closing plate portion 52 is set to the second position P2. That is, the circumferential position of the closing plate portion 52 relative to the insertion cylindrical portion 51 is adjusted so that the curved surface 71 of the closing plate portion 52 is curved concavely outward to the side. Here, the operator holds the closing grip portion 82 of the closing grip portion 53 with his/her hand, and engages the protrusion 78 of the closing plate portion 52 with the second recess 77a (see FIG. 10) of the insertion cylindrical portion 51. This allows the closing plate portion 52 to be fixed at the second position P2. After that, the operator holds the grip portion 93 of the grip portion 55 of the closing member 50 with his/her hand, as shown in FIG. 8, and inserts the insertion cylindrical portion 51 of the closing member 50 into the first cylindrical portion 36. This allows the closing plate portion 52 to close the first cylindrical portion 36. Here, when the first cylindrical portion 36 is closed by the closing member 50, the position of the closing plate portion 52 is set to the second position P2, so that the curved surface 71 arranged at the side position of the insertion cylindrical portion 51 can form a new curved invert from the third cylindrical portion 38 to the second cylindrical portion 37 together with the first invert 41 and the second invert 42, as shown in FIG. 6. Here, the curved surface 71 is configured as part of the new invert of the curved portion connecting the first invert 41 and the second invert 42.

In this embodiment, in the event of a disaster, flush water in the water supply tank 20 flows from the flush water inlet pipe 10 to the third cylindrical section 38 and into the manhole body 31 of the manhole 30. In the manhole body 31, it flows into the second cylindrical section 37 through a new curved invert formed by the first invert 41, the curved surface 71, and the second invert 42. The flush water then flows out of the manhole body 31 from the second cylindrical section 37 and into the outflow pipe 12. In the outflow pipe 12, the wastewater discharged from the temporary toilet 4 is discharged as flush water into the sewer main pipe 8 or the storage tank 28.

As described above, in this embodiment, as shown in FIG. 6, the manhole 30 includes a manhole body 31 having a bottom, a first cylindrical portion 36, a second cylindrical portion 37, a third cylindrical portion 38, a first invert 41, a second invert 42, and a closing member 50. The first cylindrical portion 36, the second cylindrical portion 37, and the third cylindrical portion 38 are provided on the side of the manhole body 31. As shown in FIG. 5, the first invert 41 is provided on the bottom of the manhole body 31, connects the first cylindrical portion 36 and the second cylindrical portion 37, and is a groove-like member curved so as to be concave downward. As shown in FIG. 6, the second invert 42 is provided on the bottom of the manhole body 31, connects the third cylindrical portion 38 and the first invert 41, and is a groove-like member curved so as to be concave downward. As shown in Figs. 5 and 6, the closing member 50 is disposed in the main body 31, and is configured to be able to be placed on either the first invert 41 or the second invert 42, and is capable of closing either the first cylindrical portion 36 or the third cylindrical portion 38. As shown in Fig. 13, the closing member 50 includes an insertion cylindrical portion 51 and a closing plate portion 52. As shown in Figs. 7 and 8, the insertion cylindrical portion 51 has a first end portion 61 and a second end portion 62 that is inserted into either the first cylindrical portion 36 or the third cylindrical portion 38. As shown in Fig. 13, the closing plate portion 52 is provided at the first end portion 61 so as to close the first end portion 61, and is configured to be able to change its circumferential position relative to the insertion cylindrical portion 51. The closing plate portion 52 is able to change its position between a first position P1 (see Fig. 13) and a second position P2 (see Fig. 14) in the circumferential direction relative to the insertion cylindrical portion 51. The closure plate portion 52 has a curved surface 71. As shown in FIG. 13, the shape of the curved surface 71 in a longitudinal section when the insertion tubular portion 51 extends laterally is such that the curved surface 71 is spaced from the insertion tubular portion 51 toward the end of the closure plate portion 52 and is recessed toward the end of the closure plate portion 52. As shown in FIG. 7, the curved surface 71 is curved downward along the shape of the first invert 41 when the closure member 50 is in the first position P1 and the third tubular portion 38 is closed. As shown in FIG. 8, the curved surface 71 is curved toward the side between the part of the first invert 41 on the second tubular portion 37 side and the second invert 42 when the closure member 50 is in the second position P2 and the first tubular portion 36 is closed.

As a result, when water is made to flow from the first cylindrical portion 36 to the second cylindrical portion 37, as shown in FIG. 5, the second end 62 of the insertion cylindrical portion 51 is inserted into the third cylindrical portion 38 as shown in FIG. 7, and the third cylindrical portion 38 is closed by the closing member 50. At this time, the circumferential position of the closing plate portion 52 relative to the insertion cylindrical portion 51 is adjusted so that the position of the closing plate portion 52 relative to the insertion cylindrical portion 51 is the first position P1 so that the curved surface 71 is curved downward. As a result, as shown in FIG. 5, the curved surface 71 is arranged along the first invert 41, and a new invert that connects the first cylindrical portion 36 and the second cylindrical portion 37 is formed by the curved surface 71 and the first invert 41. Therefore, water can be smoothly flowed along the new invert formed by the curved surface 71 and the first invert 41.

6, for example, when water is flowed from the third cylindrical portion 38 to the second cylindrical portion 37, as shown in FIG. 8, the second end 62 of the insertion cylindrical portion 51 is inserted into the first cylindrical portion 36, and the first cylindrical portion 36 is closed with the closing member 50. At this time, the circumferential position of the closing plate portion 52 relative to the insertion cylindrical portion 51 is adjusted so that the position of the closing plate portion 52 relative to the insertion cylindrical portion 51 is the second position P2 so that the curved surface 71 is curved to the side. As a result, as shown in FIG. 6, the curved surface 71 is disposed between the part of the first invert 41 on the second cylindrical portion 37 side and the second invert 42, and is configured as a curved surface connecting the part of the first invert 41 on the second cylindrical portion 37 side and the second invert 42. Therefore, a new curved invert that connects the second cylindrical portion 37 and the third cylindrical portion 38 is formed by the curved surface 71, the first invert 41, and the second invert 42. Therefore, water can flow smoothly along the new invert formed by the curved surface 71, the first invert 41, and the second invert 42.

In this embodiment, the closure plate portion 52 is configured to be detachable from the insertion tubular portion 51. This allows the closure plate portion 52 to be removed from the insertion tubular portion 51 when changing the circumferential position of the closure plate portion 52 relative to the insertion tubular portion 51, making it easy to change the circumferential position of the closure plate portion 52 relative to the insertion tubular portion 51.

In this embodiment, as shown in FIG. 13, the closure member 50 is provided on the surface of the closure plate portion 52 facing the insertion cylindrical portion 51 so as to be disposed within the insertion cylindrical portion 51, and is provided with a closure grip portion 53 that can be gripped by an operator. This allows an operator to grip the closure grip portion 53 and change the circumferential position of the closure plate portion 52. Because the closure grip portion 53 is provided on the surface of the closure plate portion 52 facing the insertion cylindrical portion 51, it is possible to prevent the closure grip portion 53 from getting wet with wastewater, for example, when wastewater flows through the manhole body 31. Therefore, when an operator grips the closure grip portion 53, it is possible to prevent the operator's hands from getting dirty with wastewater.

In this embodiment, the closure grip portion 53 has a closure rod-shaped portion 81 that extends from the closure plate portion 52 toward the inside of the insertion tubular portion 51, and a closure grip portion 82 that is provided at the end of the closure rod-shaped portion 81 and is gripped by the operator's hand. This allows the operator to reach into the insertion tubular portion 51 from the second end portion 62 side and grip the closure grip portion 82 without reaching to the back of the first end portion 61 side. This makes it easy for the operator to operate the closure grip portion 53 by gripping the closure grip portion 82.

In this embodiment, the manhole 30 has a grip 55 provided on the upper part of the insertion tubular part 51. The grip 55 is disposed on the opposite side of the first end 61 of the insertion tubular part 51 from the second end 62, and has a grip portion 93 that is gripped by the operator's hand. As a result, as shown in Figures 5 and 6, when the closure member 50 is closing either the first tubular part 36 or the third tubular part 38 inside the manhole body 31, the grip portion 93 of the grip 55 is disposed at a position away from the inner circumferential surface of the manhole body 31. Therefore, when an operator grips the grip portion 93 of the grip 55 to operate the closure member 50, it is possible to make it difficult for the operator's hand to touch, for example, wastewater adhering to the inner circumferential surface of the manhole body 31.

In this embodiment, as shown in FIG. 10, the closure member 50 includes a first locking means 76 that fixes the position of the closure plate portion 52 at the first position P1, and a second locking means 77 that fixes the position of the closure plate portion 52 at the second position P2. This allows the closure plate portion 52 to be fixed at the first position P1 by the first locking means 76. The closure plate portion 52 can be fixed at the second position P2 by the second locking means 77.

In this embodiment, as shown in FIG. 13, the closure member 50 has an outer cylindrical portion 73 that extends from the closure plate portion 52 toward the insertion cylindrical portion 51 and is fitted into the first end portion 61 of the insertion cylindrical portion 51, and a protrusion 78 that protrudes radially outward from the outer peripheral surface of the outer cylindrical portion 73. The first locking means 76 is a first recess 76a formed in the first end portion 61 of the insertion cylindrical portion 51 and engages with the protrusion 78 at the first position P1. The second locking means 77 is a second recess 77a (see FIG. 10) formed in the first end portion 61 of the insertion cylindrical portion 51 and engages with the protrusion 78 at the second position P2. As a result, by changing the position of the closure plate portion 52 in the circumferential direction relative to the insertion cylindrical portion 51 so that the protrusion 78 of the closure plate portion 52 engages with the first recess 76a, the position of the closure plate portion 52 can be aligned to the first position P1 and the closure plate portion 52 can be fixed at the first position P1. Similarly, by changing the position of the closure plate portion 52 in the circumferential direction relative to the insertion cylindrical portion 51 so that the protrusion 78 of the closure plate portion 52 engages with the second recess 77a, the position of the closure plate portion 52 can be aligned with the second position P2 and the closure plate portion 52 can be fixed at the second position P2.

In this embodiment, as shown in FIG. 5, the drainage piping system 1 includes a manhole 30, an inflow pipe 11 connected to the first cylindrical portion 36 of the manhole 30 and into which drainage flows, a water supply tank 20 (see FIG. 2) which is an example of a water supply means connected to the third cylindrical portion 38 of the manhole 30 and supplies water to the manhole 30, and an outflow pipe 12 connected to the second cylindrical portion 37 of the manhole 30 and into which drainage flows. By closing the third cylindrical portion 38 of the manhole 30 with a closing member 50, drainage can be made to flow from the inflow pipe 11 to the outflow pipe 12. Also, by closing the first cylindrical portion 36 of the manhole 30 with a closing member 50, water can be made to flow from the water supply tank 20 to the outflow pipe 12. Therefore, by changing the position of the closing member 50 of the manhole 30, the water flow path can be easily switched and water can be made to flow smoothly.

In this embodiment, the manhole main body 31 is configured so that water flows from the first cylindrical portion 36 to the second cylindrical portion 37, and from the third cylindrical portion 38 to the second cylindrical portion 37. However, the direction of water flow may be reversed in the manhole main body 31. That is, the manhole main body 31 may be configured so that water flows from the second cylindrical portion 37 to the first cylindrical portion 36, and from the second cylindrical portion 37 to the third cylindrical portion 38. In this case, the second cylindrical portion 37 functions as an inflow cylindrical portion through which water flows into the manhole main body 31. The first cylindrical portion 36 and the third cylindrical portion 38 function as outflow cylindrical portions through which water flows out of the manhole main body 31.

Figure 16 is a plan view showing a drainage piping system 1A according to a modified example of the first embodiment. As shown in Figure 16, the manhole 30 according to this embodiment may be provided in the drainage piping system 1A. The drainage piping system 1A includes an inflow pipeline 11A into which drainage flows, an outflow pipeline 12A from which drainage flows, and a storage tank 28. A drainage facility 6 as shown in Figure 2 is connected to the inflow pipeline 11A. In addition to the drainage facility 6, a water supply tank 20 (see Figure 2) may be connected to the inflow pipeline 11A, and in the event of a disaster, a temporary toilet 4 as shown in Figure 4 may be connected. A sewer main pipe 8 (see Figure 4) is connected to the outflow pipeline 12A.

In this embodiment, the second cylindrical portion 37 of the manhole 30 is connected to the inlet pipeline 11A. The first cylindrical portion 36 of the manhole 30 is connected to the outlet pipeline 12A. The third cylindrical portion 38 of the manhole 30 is connected to the storage tank 28. Here, the third cylindrical portion 38 is connected to the storage tank 28 via the pipeline 13. In this embodiment, the second cylindrical portion 37 functions as an inlet cylindrical portion through which wastewater flows into the manhole body 31. The first cylindrical portion 36 and the third cylindrical portion 38 function as outlet cylindrical portions through which wastewater flows out of the manhole body 31.

When drainage water in the inlet pipe 11A is to flow toward the outlet pipe 12A, the third cylindrical portion 38 of the manhole 30 is closed with the closing member 50. This allows drainage water to flow from the inlet pipe 11A toward the outlet pipe 12A. When drainage water in the inlet pipe 11A is to flow toward the storage tank 28, the first cylindrical portion 36 of the manhole 30 is closed with the closing member 50. This allows drainage water to flow from the inlet pipe 11A toward the storage tank 28. Therefore, by changing the position of the closing member 50 of the manhole 30, the drainage water flow path can be easily switched while drainage water can be smoothly flowed.

In the drainage piping system 1 shown in FIG. 2, the switching manhole 29 may be changed to a manhole 30. In this case, the second cylindrical portion 37 of the manhole 30 may be connected to a portion of the outflow pipeline 12 that is upstream of the switching manhole 29. The first cylindrical portion 36 of the manhole 30 may be connected to a portion of the outflow pipeline 12 that is downstream of the switching manhole 29. The third cylindrical portion 38 of the manhole 30 may be connected to the storage tank 28. Even in this case, the same effect as that of the drainage piping system 1A shown in FIG. 16 above can be obtained.

Second Embodiment
Next, a manhole 30A according to the second embodiment will be described. Figures 17 and 18 are plan views of the manhole 30A according to the second embodiment. Figure 17 shows a state in which the closing member 50 closes the third cylindrical portion 38A. Figure 18 shows a state in which the closing member 50 closes the first cylindrical portion 36A.

As shown in FIG. 17, the manhole 30A includes a manhole body 31, a first cylindrical portion 36A, a second cylindrical portion 37A, a third cylindrical portion 38A, a first invert 41A, a second invert 42A, and a closing member 50. The manhole body 31 has the same configuration as the manhole 30 of the first embodiment (see FIG. 5).

As shown in FIG. 17, the first cylindrical portion 36A, the second cylindrical portion 37A, and the third cylindrical portion 38A are provided on the side of the main body 31. In this embodiment, in a plan view, the first cylindrical portion 36A is disposed on one side of the axis L37 of the second cylindrical portion 37A, and the third cylindrical portion 38A is disposed on the other side of the axis L37 of the second cylindrical portion 37A. The first cylindrical portion 36A and the third cylindrical portion 38A face each other across the axis L37, and are disposed in positions that are linearly symmetrical about the axis L37.

The first invert 41A is provided at the bottom of the manhole body 31 and connects the first cylindrical portion 36A and the second cylindrical portion 37A. The first invert 41A is a groove-shaped curved recessed downward. In this embodiment, the first invert 41A has a shape in which a part of the first invert 41A extends in a curved manner from the first cylindrical portion 36A toward the second cylindrical portion 37A. As shown in FIG. 18, the second invert 42A is provided at the bottom of the manhole body 31 and connects the third cylindrical portion 38A and the first invert 41A. The second invert 42A is a groove-shaped curved recessed downward. In this embodiment, the second invert 42A has a shape that extends in a straight line from the third cylindrical portion 38A toward the first invert 41A. Here, the first invert 41A and the second invert 42A form a Y-shaped invert.

The configuration of the closure member 50 according to this embodiment is substantially the same as the configuration of the closure member 50 according to the first embodiment (see FIG. 9). In the closure member 50, the closure plate portion 52 is configured to be detachable from the insertion cylindrical portion 51, and is configured to be circumferentially changeable relative to the insertion cylindrical portion 51. In particular, the closure plate portion 52 is configured to be circumferentially changeable between a first position P1A (see FIG. 17) and a second position P2A (see FIG. 18) relative to the insertion cylindrical portion 51.

In this embodiment, as shown in FIG. 17, the first position P1A is different from the first position P1 (see FIG. 5) in the first embodiment. Here, the first position P1A is the circumferential position of the closure plate portion 52 with respect to the insertion tubular portion 51 when the curved surface 71 is located at the height of the side of the insertion tubular portion 51. At the first position P1A, the curved surface 71 is curved so as to be concave toward the outside of the side. Note that, as shown in FIG. 18, the second position P2A is the same as the second position P2 (see FIG. 6) in the first embodiment, and is the circumferential position of the closure plate portion 52 with respect to the insertion tubular portion 51 when the curved surface 71 is located at the height of the side of the insertion tubular portion 51. At the second position P2A, the curved surface 71 is curved so as to be concave toward the outside of the side. Here, at the second position P2A, the curved surface 71 is disposed on the opposite side to the curved surface 71 at the first position P1A (see FIG. 17). The curved surface 71 at the first position P1A and the curved surface 72 at the second position P2A face each other across the axis of the insertion tubular portion 51 in a plan view. The position when the closure plate portion 52 at the first position P1A is rotated 180 degrees in the circumferential direction of the insertion tubular portion 51 becomes the second position P2A.

In this manner, in this embodiment, as shown in FIG. 17, when the closure member 50 is in the first position P1A and closing the third cylindrical portion 38A, the curved surface 71 curves laterally along the shape of the first invert 41A, and as shown in FIG. 18, when the closure member 50 is in the second position P2A and closing the first cylindrical portion 36A, the curved surface 71 curves laterally between the portion of the first invert 41A on the second cylindrical portion 37A side and the second invert 42A.

In this embodiment, as shown in FIG. 17, when the third cylindrical portion 38A is closed by the closing member 50, the closing plate portion 52 is set to the first position P1A. That is, the circumferential position of the closing plate portion 52 relative to the insertion cylindrical portion 51 is adjusted so that the curved surface 71 of the closing plate portion 52 is curved concavely outward to the side. When the third cylindrical portion 38A is closed by the closing member 50, the position of the closing plate portion 52 is set to the first position P1A, so that the curved surface 71 arranged at the side position of the insertion cylindrical portion 51 can form a new curved invert from the first cylindrical portion 36A to the second cylindrical portion 37A together with the first invert 41A. Here, the curved surface 71 is configured as a part of the new invert of the curved portion. Therefore, water can flow smoothly along the new invert formed by the curved surface 71 and the first invert 41A.

On the other hand, as shown in FIG. 18, when the first cylindrical portion 36A is closed by the closing member 50, the closing plate portion 52 is set to the second position P2A. That is, the circumferential position of the closing plate portion 52 relative to the insertion cylindrical portion 51 is adjusted so that the curved surface 71 of the closing plate portion 52 is curved concavely outward to the side. When the first cylindrical portion 36A is closed by the closing member 50, the position of the closing plate portion 52 is set to the second position P2A, so that the curved surface 71 arranged at the side position of the insertion cylindrical portion 51 can form a new curved invert from the third cylindrical portion 38A toward the second cylindrical portion 37A together with the first invert 41A and the second invert 42A. Here, the curved surface 71 is configured as a part of the new invert of the curved portion connecting the first invert 41A and the second invert 42A. Therefore, water can flow smoothly along the new invert formed by the curved surface 71, the first invert 41A, and the second invert 42A.

1, 1A Drainage piping system 30, 30A Manhole 31 Manhole body 36, 36A First cylindrical portion 37, 37A Second cylindrical portion 38, 38A Third cylindrical portion 41, 41A First invert 42, 42A Second invert 50 Closure member 51 Insertion cylindrical portion 52 Closure plate portion 53 Closure grip portion 55 Grip portion 61 First end portion 62 Second end portion 71 Curved surface 81 Closure rod portion 82 Closure grip portion 93 Grip portion

Claims (7)

A cylindrical container body with a bottom,
A first cylindrical portion provided on a side portion of the main body;
A second cylindrical portion provided on a side portion of the main body;
A third cylindrical portion provided on a side portion of the main body;
A first invert is provided at the bottom of the main body, connects the first cylindrical portion and the second cylindrical portion, and is curved downwardly to form a groove;
A second invert is provided at the bottom of the main body, connects the third cylindrical portion and the first invert, and is curved downwardly.
a closing member configured to be placed on either the first inverter or the second inverter and capable of closing either the first cylindrical portion or the third cylindrical portion;
Equipped with
The closing member is
an insertion tubular portion having a first end and a second end that is inserted into either the first tubular portion or the third tubular portion;
a closing plate portion provided at the first end portion to close the first end portion, the closing plate portion being movable between a first position and a second position in a circumferential direction relative to the insertion cylindrical portion;
Equipped with
The closure plate portion has a curved surface whose cross-sectional shape when the insertion tubular portion extends horizontally moves away from the insertion tubular portion toward the end of the closure plate portion and has a concave shape toward the end of the closure plate portion when the insertion tubular portion extends horizontally. The curved surface is curved downward along the shape of the first invert when the closing member is closing the third cylindrical portion in the first position, and curved sideways between the part of the first invert that is on the second cylindrical portion side and the second invert when the closing member is closing the first cylindrical portion in the second position, as described in claim 1. The curved surface is curved laterally along the shape of the first invert when the closing member is closing the third cylindrical portion in the first position, and is curved laterally between the portion of the first invert on the second cylindrical portion side and the second invert when the closing member is closing the first cylindrical portion in the second position, as described in claim 1. The closing plate portion is configured to be detachable from the insertion tube portion, as described in any one of claims 1 to 3. The closure member is provided on the surface of the closure plate portion facing the insertion tube portion so as to be placed inside the insertion tube portion, and is provided with a closure grip portion that can be gripped by an operator, as described in any one of claims 1 to 4. According to any one of claims 1 to 5,
an inlet pipe connected to the first cylindrical portion of the bucket and through which wastewater flows;
a water supply means connected to the third cylindrical portion of the bucket and configured to supply water to the bucket;
an outflow pipe connected to the second cylindrical portion of the bucket and through which wastewater flows out;
A drainage piping system. According to any one of claims 1 to 5,
an inlet pipe connected to the second cylindrical portion of the bucket and through which wastewater flows;
an outflow pipe connected to the first cylindrical portion of the basin through which wastewater flows out;
A storage tank connected to the third cylindrical portion of the container;
A drainage piping system.

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