JP6348032B2 - Drainage mass and drainage system equipped with it - Google Patents

Description

  The present invention relates to a drainage muffler and a drainage system provided with the same.

  Conventionally, a drainage system for discharging drainage from a drainage facility to a sewage main is known. Examples of the drainage facility include a toilet, a bath, or a kitchen sink. This type of drainage system includes an outflow pipe connecting the drainage facility and the sewage main. Drainage from the drainage facility is discharged to the sewage main through the outflow pipe.

  By the way, when a disaster such as a large-scale earthquake or tsunami occurs, the sewer main may be damaged. If the sewage main is damaged, there is a risk of drainage from the sewage main to the outside.

  Patent Document 1 discloses a socket capable of switching the flow path of drainage. This socket includes a vertical tube portion, upstream and downstream normal-time pipelines, emergency pipelines, and a closing door. A vertical cylinder part is a bottomed cylindrical thing opened to upper part. The upstream normal pipe and the downstream normal pipe are provided so as to face the side of the vertical cylinder. The emergency time pipe line projects in one direction from the vertical tube portion at a position below the normal time pipe line. The closing door closes the emergency pipeline. For example, a drainage facility is connected to the upstream normal pipe, and a sewage main pipe is connected to the downstream normal pipe. An emergency wastewater treatment facility is connected to the emergency pipeline. In this socket, the emergency line is normally closed by a closing door. For this reason, the drainage discharged from the drainage facility is normally discharged to the sewage main through the normal pipeline. On the other hand, in an emergency such as a disaster, the emergency pipeline is opened by raising the closed door. Therefore, wastewater that has flowed out of the drainage facility at the time of emergency falls naturally in the vertical cylindrical portion and is discharged from the emergency pipeline to the emergency wastewater treatment facility.

  Patent Document 2 discloses a pipe joint capable of switching the flow path of drainage. This pipe joint includes a tubular joint body extending in the horizontal direction. A drainage facility is connected to the upstream end of the joint body through an upstream outflow pipe, and a sewage main pipe is connected to the downstream end through a downstream outflow pipe. The joint body is rotatable in the circumferential direction with respect to the outflow pipe. An opening is formed on the side surface of the joint body. This opening communicates with the inside of the storage tank. A protrusion is provided on the inner surface of the joint body between the downstream end and the opening and on the side where the opening is formed. Normally, the pipe joint is arranged such that the opening of the joint body opens upward and the protrusion protrudes downward. Normally, wastewater that flows into the joint body from the drainage facility flows toward the downstream end of the joint body and is discharged to the sewage main pipe. On the other hand, at the time of emergency, the joint body is rotated in the circumferential direction, and the pipe joint is arranged so that the opening of the joint body opens downward and the protrusion protrudes upward. At the time of emergency, the waste water that has flowed into the joint body from the drainage facility is blocked by the protrusions and flows toward the opening of the joint body without flowing to the downstream end of the joint body. Thereafter, the wastewater is discharged into a storage tank.

Japanese Patent Application Laid-Open No. 7-300897 JP 2014-80852 A

  However, in the socket described in Patent Document 1, the emergency pipeline is opened by pulling up the closing door during the emergency, but the downstream normal pipeline remains open. For this reason, when drainage flows into the vertical cylinder part from the normal pipe line upstream of the vertical cylinder part, part of the drainage may flow into the normal pipe line on the downstream side.

  In the pipe joint described in Patent Document 2, normally, since the protrusion must not block the drainage flowing to the downstream end of the joint body, the protrusion cannot be made sufficiently long. Therefore, during emergency, when drainage flows into the joint body vigorously from the upstream end of the joint body, a part of the drainage may get over the protrusion and flow to the downstream end of the joint body.

  This invention is made | formed in view of this point, The objective is the waste_water | drain which can switch the flow path provided with the 1st outflow port and the 2nd outflow port, Comprising: Drainage | drain flows out from a 2nd outflow port. And a drainage system provided with the drainage can capable of preventing the drainage from flowing to the first outlet.

  The drainage basin according to the present invention includes a substantially cylindrical main body, a lid, and overflow prevention means. The main body has an inspection port opened upward, an inlet formed at a side, an inlet through which drainage flows in, a first outlet through which drainage flows out, and formed at the bottom, the drainage A second outlet that flows out. The lid body is provided in the main body so as to freely open and close the second outlet, and includes a first switching position for closing the second outlet and a second switching position for opening the second outlet. The position can be changed between. The overflow prevention means is provided in the main body, and blocks the drainage from flowing to the first outlet when the lid is disposed at the second switching position.

  According to the drainage basin, when the second outlet of the main body is opened by disposing the lid body at the second switching position, the drainage in the main body is increasingly directed to the first outlet by the overflow prevention means. The flow is blocked. This prevents the drainage from flowing into the first outlet even when the drainage flows into the main body from the inlet when the lid is arranged at the second switching position. it can.

  According to the drainage basin, the flow path of the drainage flowing through the main body can be switched with a simple configuration in which the second outlet is closed or opened with the lid. For example, the operator can open and close the second outlet by operating the lid through the inspection port. Therefore, the operator can easily switch the drainage channel.

  According to another preferable aspect of the present invention, the overflow prevention means is formed integrally with the lid. When the lid is disposed at the second switching position, the overflow prevention means is disposed at a position that blocks the first outlet.

  According to the above aspect, the overflow prevention means and the lid are integrally formed, and the first outlet is prevented from overflowing only by changing the position of the lid from the first switching position to the second switching position. Blocked by means. There is no need to separately perform the operation of changing the position of the lid and the operation of changing the position of the overflow prevention means.

  According to another preferred aspect of the present invention, the overflow preventing means is disposed between the inflow port and the first outflow port when the lid body is disposed at the second switching position. And swingable in a direction approaching the first outlet.

  According to the above aspect, when the lid is disposed at the second switching position, the overflow prevention means is disposed between the inflow port and the first outflow port. If it flows in well, the drainage will hit the overflow prevention means. The overflow prevention means is configured to be swingable as described above. At this time, the overflow prevention means that the waste water collides moves in a direction approaching the first outlet, so that the first outlet is sufficiently provided. Can be blocked.

  According to another preferred aspect of the present invention, when the lid is disposed at the second switching position and the overflow prevention means swings, the overflow prevention means blocks the first outlet. And a support portion for supporting the lid.

  According to the above aspect, when the cover body is arranged at the second switching position and the overflow prevention means swings, the overflow prevention means is in the state where the overflow prevention means is supported by the support portion together with the cover body. One outlet can be closed. Therefore, when the lid is disposed at the second switching position, it is possible to prevent drainage from flowing to the first outlet.

  According to another preferable aspect of the present invention, two support portions are provided on the inner surface of the vertical cylindrical portion so as to face each other across the second outflow port in a plan view.

  According to the said aspect, a cover body can be stably supported by two support parts.

  According to another preferred embodiment of the present invention, the main body is formed with the inflow port and the first outflow port, and is formed with a vertical cylindrical portion extending in the vertical direction and the second outflow port, And an outflow tubular portion extending downward from the bottom of the vertical tubular portion. The overflow prevention means extends downward from the bottom of the lid. When the lid is disposed at the second switching position, a lower portion of the overflow prevention means is disposed within the outflow cylindrical portion, and when the overflow prevention means swings, the overflow prevention means A part of the lower part can contact an upper edge part connected to the first outlet in the upper edge part of the outflow cylindrical part.

  According to the above aspect, when the lid body is disposed at the second switching position, the wastewater that has flown into the main body from the inflow port collides with the overflow prevention unit, so that the overflow prevention unit approaches the first outlet. Swing to. At this time, a part of the lower portion of the oscillating overflow prevention means contacts the upper edge portion connected to the first outlet in the upper edge portion of the outflow cylindrical portion. As a result, it is possible to prevent the waste water from flowing to the first outlet and to secure a flow path for the waste water flowing from the inlet to the second outlet.

  According to another preferable aspect of the present invention, when the lid is disposed at the second switching position and the overflow preventing means swings, the support portion is configured such that a tip of the overflow preventing means is the The lid is supported so as to be positioned below the upper end of the outflow cylindrical portion.

  According to the above aspect, when the cover body is disposed at the second switching position and the overflow prevention means swings, the tip of the overflow prevention means is supported with the cover body and the overflow prevention means supported by the support portion. Is positioned below the upper end of the outflow cylindrical portion. Therefore, at this time, the first outlet can be sufficiently blocked by the overflow prevention means.

  According to another preferable aspect of the present invention, the lid body includes an invert portion that connects the inflow port and the first outflow port when the lid body is disposed at the first switching position.

  According to the said aspect, when a cover body is arrange | positioned in the 1st switching position, drainage can be smoothly flowed from an inflow port to a 1st outflow port by an invert part. Therefore, the drainage from the inlet to the first outlet when the lid is arranged at the first switching position with one member (that is, the lid integrated with each other, the overflow prevention means, and the invert part). A flow path that leads smoothly can be secured, and the first outlet can be closed when the lid is disposed at the second switching position. Therefore, the number of parts can be reduced.

  According to another preferable aspect of the present invention, the support portion is an arc-shaped support groove recessed downward. Both ends of the invert portion in the flow path direction are swingably supported by the support groove when the lid body is disposed at the second switching position.

  According to the above aspect, when the lid is disposed at the second switching position, even if the invert portion is to be disposed at a position slightly deviated from the support groove, the invert portion is correctly disposed along the arc-shaped support groove. It is easy to be guided to. Therefore, even if the invert portion is disposed at a position slightly deviated from the support groove, the invert portion can be correctly disposed in the support groove.

  According to another preferable aspect of the present invention, the two support portions are provided so as to face each other with a central axis of the first outlet port in plan view. The overflow prevention means is formed in a plate shape. In plan view, the flow path direction of the invert portion and the thickness direction of the overflow prevention means are orthogonal to each other.

  According to the said aspect, since the overflow prevention means is plate shape, the thickness of an overflow prevention means can be suppressed. Therefore, when the lid is arranged at the second switching position, it is easy to prevent the drainage from flowing to the first outlet by the overflow prevention means and to secure a flow path for the drainage flowing to the second outlet. In the above aspect, when the lid is arranged at the second switching position, the overflow prevention means can close the first outlet by the surface having a large surface area while the invert portion is supported by the support portion. . Therefore, the first outlet can be closed more reliably.

  According to another preferable aspect of the present invention, the overflow prevention means is disposed so as to face the first outlet when the lid is disposed at the second switching position.

  According to the above aspect, when the lid is disposed at the second switching position, the overflow prevention means is disposed so as to face the first outlet, so that the first outlet can be more reliably closed. .

  According to another preferable aspect of the present invention, the outflow cylindrical portion has a cylindrical shape. The overflow prevention means has a semi-elliptical shape with a bent lower edge.

  For example, when the overflow prevention means has a rectangular shape, when the lid is disposed at the second switching position and the overflow prevention means swings, only the corners of the overflow prevention means come into contact with the outflow cylindrical portion. . As a result, a large gap that is connected to the first outlet is easily generated between the overflow prevention means and the outflow cylindrical portion. There is a possibility that drainage flows from the large gap to the first outlet. However, according to the said aspect, since the overflow prevention means is a semi-elliptical shape, the contact area of an overflow prevention means and an outflow cylindrical part can be enlarged. Therefore, compared with the case where the overflow prevention means has a rectangular shape, the gap formed between the overflow prevention means and the outflow cylindrical portion can be eliminated or reduced. Therefore, compared with the case where the overflow prevention means has a rectangular shape, it is possible to further prevent the drainage from flowing to the first outlet when the lid is disposed at the second switching position.

  According to another preferable aspect of the present invention, the surface on the inlet side of the overflow preventing means when the lid is disposed at the second switching position is thicker toward the center in the width direction. It has a concave shape in the direction.

  According to the said aspect, the thickness of the center part of the width direction of an overflow prevention means can be suppressed. Therefore, when the lid is arranged at the second switching position, it is easy to secure a flow path for drainage flowing to the second outlet while closing the first outlet by the overflow prevention means.

  In the drainage system of the present invention, when any one of the drainage pipes described above, the upstream end is connected to the drainage facility, the downstream end is connected to the inlet, and the upstream end is connected to the first outlet. And an outlet pipe whose downstream end is connected to the sewage main pipe, and a storage tank that is connected to the second outlet and stores drainage.

  According to the drainage system, even if the sewage main is damaged, the drainage drains the wastewater flowing into the inflow conduit from the drainage facility by switching the drainage flow through the main body. It can be discharged to the storage tank through the mass.

  According to the present invention, the drainage can be switched with the first outlet and the second outlet, and the drainage flows to the first outlet when the drainage flows out from the second outlet. It is possible to provide a drainage system and a drainage system equipped with it.

It is a top view of the drainage system concerning an embodiment. It is a front view of the drainage system concerning an embodiment. It is a top view of a drainage basin. It is a front view of a drainage basin. FIG. 5 is a front sectional view of the drainage basin in the VV section of FIG. 3. FIG. It is front sectional drawing of a main body. It is a right side view of the main body. It is a top view of the drain in the state which has arrange | positioned the cover body to the 2nd switching position. It is front sectional drawing of the drainage in the state which has arrange | positioned the cover body to the 2nd switching position. It is a top view of a lid. It is a front view of a lid. It is a side view of a lid. It is a bottom view of a lid. It is sectional drawing of the protrusion part and step part which show the state in which the protrusion part is correctly mounted in the step part. It is sectional drawing of the protrusion part and level | step difference part which show the state in which the protrusion part is not correctly mounted in the level | step difference part. It is a figure which shows the state which the cover body rock | fluctuated with respect to the main body.

  Hereinafter, embodiments of a drainage basin and a drainage system according to the present invention will be described with reference to the drawings. The embodiments described herein are, of course, not intended to limit the present invention in particular. Further, members / parts having the same action are denoted by the same reference numerals, and redundant description is omitted or simplified.

  First, the drainage system 1 according to the present embodiment will be described. FIG. 1 is a plan view of a drainage system 1 according to the present embodiment. FIG. 2 is a front view of the drainage system 1. As shown in FIG. 1, the drainage system 1 is a system through which drainage flows. Here, “drainage” includes sewage and rainwater. “Sewage” is water discharged from toilets, baths, kitchen sinks, etc., and cannot be discharged into the river as it is. In the present embodiment, the drainage facility 5 is a facility that discharges sewage, such as a toilet, a bath, and a kitchen sink. “Rainwater” is water caused by natural phenomena such as rainfall, and can be discharged into a river as it is. Here, the drainage system 1 is a system through which sewage flowing out from the drainage facility 5 flows. However, the drainage system 1 may be a system through which rainwater flows. In this case, for example, the drainage facility 5 is replaced with a gutter in which rainwater is collected, and the sewage main 15 is replaced with a rainwater main. As shown in FIG. 2, the drainage system 1 is embedded in the ground. The drainage system 1 includes a drainage pipe 10, a drainage tank 20 capable of switching a drainage flow path, and a storage tank 70.

  Although not particularly illustrated, the drain pipe 10 is inclined downward toward the downstream. As shown in FIG. 1, the drainage pipe 10 includes an inflow pipe 11, a first outflow pipe 12, and a second outflow pipe 13. The sewage discharged from the drainage facility 5 flows into the inflow conduit 11. The upstream end of the inflow conduit 11 is connected to the drainage facility 5. The downstream end of the inflow conduit 11 is connected to the drain 20. The sewage that has flowed out of the drainage basin 20 flows into the first outflow pipe 12. The upstream end of the first outflow pipe 12 is connected to the drain 20. The downstream end of the first outflow pipe 12 is connected to a sewage main pipe 15 that guides sewage to a sewage treatment plant (not shown). The first outflow pipe 12 corresponds to the “outflow pipe” of the present invention. Here, on the downstream side of the first outflow pipe 12, a public trough 16 is provided. A public basin 16 is provided between the drain 20 and the sewage main 15.

  The sewage that has flowed out of the drainage basin 20 flows into the second outflow conduit 13. The upstream end of the second outflow pipe 13 is connected to the drain 20. The downstream end of the second outflow conduit 13 is connected to a storage tank 70 that temporarily stores sewage. “Pipe” means a passage through which water flows. The “pipe” may be constituted by a single pipe, or may be constituted by a plurality of pipes and a joint connecting the pipes as in the present embodiment.

  Next, the drainage basin 20 according to this embodiment will be described. The drainage basin 20 is a tank capable of switching the flow path of drainage (sewage in this embodiment). The drainage basin 20 is provided in the middle of the drainage pipe 10. Here, the drainage basin 20 is provided between the downstream end of the inflow conduit 11 and the upstream end of the first outflow conduit 12. FIG. 3 is a plan view of the drain 20. FIG. 4 is a front view of the drain 20. FIG. 5 is a front sectional view of the drain 20 in the VV section of FIG. In the following drawings, the symbols F, Rr, L, and R represent the front, rear, left, and right of the drainage 20, respectively. However, each direction is determined for convenience of explanation, and the present invention is not particularly limited. As shown in FIG. 5, the drainage basin 20 includes a main body 21, a lid body 26, and an overflow prevention plate 55.

  FIG. 6 is a plan view of the main body 21. FIG. 7 is a front sectional view of the main body 21. FIG. 8 is a right side view of the main body 21. 6 to 8 show a state in which the lid body 26 is removed from the main body 21. FIG. As shown in FIG. 7, the main body 21 is substantially cylindrical and has a shape having a space inside. In the present embodiment, as shown in FIG. 4, the main body 21 is constituted by a vertical cylindrical portion 21a, an inflow cylindrical portion 21b, a first outflow cylindrical portion 21c, and a second outflow cylindrical portion 21d. . The vertical cylindrical portion 21a extends in the vertical direction so as to open upward. The inflow cylindrical portion 21b is provided so as to extend laterally (leftward in FIG. 4) from the side surface of the vertical cylindrical portion 21a. The first outflow tubular portion 21c is provided so as to face the inflow tubular portion 21b and extend laterally (rightward in FIG. 4) from the side surface of the vertical tubular portion 21a. The 2nd outflow cylindrical part 21d is provided so that it may extend below from the center part of the bottom face of the vertical cylindrical part 21a. In the present embodiment, the second outflow cylindrical portion 21d corresponds to the “outflow cylindrical portion” of the present invention. As shown in FIG. 7, the main body 21 is formed with an inspection port 31, an inlet 32, a first outlet 33 and a second outlet 34.

  The inspection port 31 is opened upward in the upper part of the main body 21. In the present embodiment, the inspection port 31 is formed at the upper end of the vertical cylindrical portion 21a of the main body 21. The inspection port 31 is a part where an operator performs maintenance to check whether the inside of the main body 21 is damaged or clogged. The inspection port 31 opens larger than the inflow port 32, the first outflow port 33, and the second outflow port 34. In other words, the inner diameter of the inspection port 31 is longer than the inner diameter of the inlet 32, the inner diameter of the first outlet 33, and the inner diameter of the second outlet 34. Therefore, the operator can easily perform maintenance inside the main body 21 through the inspection port 31 more easily. As shown in FIG. 2, the inspection cylinder 17 is connected to the inspection port 31. Here, the drain 20 is buried in the ground so that the upper end of the inspection cylinder 17 is arranged at substantially the same height as the ground. A lid 18 is disposed at the upper end of the inspection cylinder 17. Normally, the inspection cylinder 17 is closed by the lid 18.

  As shown in FIG. 7, the inlet 32 is provided at the side of the main body 21. The inflow port 32 is open toward the side. In this embodiment, the inflow port 32 is formed in the end surface of the inflow cylindrical part 21b of the main body 21 more and more. The sewage discharged from the drainage facility 5 flows into the inflow port 32. As shown in FIG. 1, the downstream end of the inflow conduit 11 is connected to the inflow port 32. In addition, although the piping which makes a part of inflow pipeline 11 is directly connected to the inflow port 32, the said piping may be indirectly connected to the inflow port 32 via another member. Here, the inflow port 32 is a receiving port into which a pipe is inserted, but may be a differential port into which the pipe is inserted.

  As shown in FIG. 8, the first outlet 33 is provided at the side of the main body 21. As shown in FIG. 7, the 1st outflow port 33 is opening toward the side. Here, the first outlet 33 is disposed on the opposite side of the inlet 32. The first outlet 33 is opposed to the inlet 32. However, the arrangement position of the first outlet 33 is not particularly limited. In this embodiment, the 1st outflow port 33 is formed in the end surface of the 1st outflow cylindrical part 21c of the main body 21 more and more. The sewage flowing through the main body 21 flows out from the first outlet 32. As shown in FIG. 1, the upstream end of the first outlet pipe 12 is connected to the first outlet 33. The first outlet 33 may be directly connected to a pipe that forms a part of the first outflow pipe 12, or the pipe may be indirectly connected via another member. Here, the first outlet 33 is a receiving port, but it may be a difference port.

  As shown in FIG. 7, the second outlet 34 is provided at the bottom of the main body 21. The second outlet 34 is open downward. In this embodiment, the 2nd outflow port 34 is formed in the end surface of the 2nd outflow cylindrical part 21d of the main body 21 more. As shown in FIG. 6, the second outlet 34 is provided at the center of the bottom of the main body 21. The second outlet 34 is provided at a central portion in the inspection port 31 in plan view. The second outlet 34 is provided between the inlet 32 and the first outlet 33 in plan view. As shown in FIG. 7, the second outlet 34 is provided at a position lower than the inlet 32 and the first outlet 33. Here, the inner diameter of the second outlet 34 is the same as the inner diameter of the inlet 32 and the inner diameter of the first outlet 33. However, the inner diameter of the second outlet 34 may be larger or smaller than the inner diameter of the inlet 32 and the inner diameter of the first outlet 33. The shape of the second outlet 34 is a perfect circle. However, the shape of the second outlet 34 is not particularly limited, and may be an ellipse shape. In this case, the direction of the long axis of the second outlet 34 may be parallel to the direction of the central axis L32 of the inlet 32. As a result, when the second outlet 34 is opened, it becomes difficult for sewage that has flowed into the main body 21 from the inlet 32 over the second inlet 34 to flow to the first outlet 33. The sewage flowing through the main body 21 flows out from the second outlet 34. As shown in FIG. 2, the upstream end of the second outlet pipe 13 is connected to the second outlet 34. A storage tank 70 is connected to the second outlet 34 via the second outlet pipe 13. However, the storage tank 70 may be directly connected to the second outlet 34. In this case, the second outflow conduit 13 can be omitted. In this case, the drainage basin 20 is placed on the storage tank 70. Here, although the 2nd outflow port 34 is a receiving port, it may be a difference port. The drainage basin 20 may be disposed inside the storage tank 70. In this case, the inspection port 31 of the drainage 20 may be disposed in the opening part of the upper part of the storage tank 70. As a result, the arrangement space for the drainage basin 20 and the storage tank 70 is reduced, so that the wastewater can be arranged compactly.

  As shown in FIG. 7, in the main body 21, an inclined portion 22 is provided at a connection portion on the inlet 32 side of the connection portion between the vertical cylindrical portion 21 a and the second outflow cylindrical portion 21 d. The inclined portion 22 is steeper as it goes to the second outlet 34. The inclined portion 22 is curved so as to be convex toward the inside of the main body 21. In addition, in the main body 21, a connection portion (upper edge portion of the second outflow cylindrical portion 21d) 23 on the first outlet 33 side among the connection portions between the vertical cylindrical portion 21a and the second outflow cylindrical portion 21d. Is not provided with an inclination like the inclined portion 22. Here, the connection part 23 is a right angle.

  Here, as shown in FIG. 6, inclined surfaces 40 are provided so as to face each other on the inner surface of the main body 21 and in front of and behind the second outlet 34 in a plan view. As shown in FIG. 8, the inclined surface 40 is inclined downward toward the second outlet 34 in a side view. As a result, when sewage rides on the inclined surface 40, the sewage that has ridden can flow to the bottom of the main body 21 along the inclined surface 40. Therefore, it is possible to prevent sewage from accumulating on the inclined surface 40.

  As shown in FIG. 6, the drainage basin 20 includes a step portion 41, a support groove 42, and a confirmation portion 43. The step portion 41 is a part that supports the lid body 26 when the lid body 26 is disposed at a first switching position A (see FIG. 3) described later. A detailed description of the step portion 41 supporting the lid 26 will be described later. The step portion 41 is provided so as to be opposed to each other on the inner surface of the main body 21 and in front of and behind the second outlet 34 in plan view. The step portions 41 are opposed to each other across a center axis L32 of the inlet 32 (in this embodiment, the center axis L32 coincides with the center axis L33 of the first outlet 33) in plan view. Two are provided on the side of the main body 21. The step portion 41 is provided at the center portion in the inspection port 31 in the axial direction of the inflow port 32 (or the axial direction of the first outflow port 33) in plan view. Here, the step portion 41 is provided closer to the second outlet 34 than the inclined surface 40 in plan view. As shown in FIG. 7, the step portion 41 has a surface 41 a that is inclined downward toward the central axis L <b> 31 of the inspection port 31. As shown in FIG. 6, the step portion 41 has an arc shape.

  The support groove 42 is a part that supports the lid body 26 when the lid body 26 is disposed at a second switching position B (see FIG. 9) described later. A detailed description of the support groove 42 supporting the lid 26 will be described later. Two support grooves 42 are provided on the inner surface of the vertical cylindrical portion 21a of the main body 21 so as to face each other across the second outlet 34 in a plan view. The support groove 42 is provided in front of and behind the second outlet 34. In plan view, the two support grooves 42 are provided so as to face each other across the central axis L33 of the first outlet 33. Here, the support groove 42 is provided in the step portion 41. The support groove 42 is provided closer to the second outlet 34 than the inclined surface 40 in plan view. As shown in FIG. 7, the support groove 42 is provided below (in detail, directly below) the stepped portion 41 in a front view. As shown in FIG. 6, the support groove 42 is provided in the central portion of the main body 21 in the axial direction L32 of the inflow port 32 (or the axial direction L33 of the first outflow port 33) in plan view. As shown in FIG. 7, the support groove 42 is an arc-shaped groove recessed downward. However, the shape of the support groove 42 is not particularly limited. A plurality of protrusions 45 are provided on the surface of the support groove 42. Here, five protrusions 45 are provided for each support groove 42, but the number of protrusions 45 is not particularly limited. The plurality of protrusions 45 are arranged on the surface of the support groove 42 so as to be equidistant from each other, but the interval is not particularly limited. For example, the interval between the plurality of protrusions 45 may be narrower as it approaches the center of the support groove 42 in plan view. In the present embodiment, the support groove 42 corresponds to the “support portion” of the present invention.

  As shown in FIG. 3, the confirmation unit 43 is a member for confirming whether or not the lid body 26 is correctly disposed at the stepped portion 41 when the lid body 26 is disposed at the first switching position A. . As shown in FIG. 6, the confirmation unit 43 is provided on the inner surface of the main body 21 in front and behind the second outlet 34 in a plan view. The confirmation parts 43 are opposed to each other with the second outlet 34 interposed therebetween. Here, the confirmation portion 43 is disposed outside the step portion 41 and in the central portion of the inclined surface 40. A part of the confirmation part 43 protrudes from the inclined surface 40 to the step part 41. The confirmation unit 43 has a plate shape. The confirmation part 43 is good to be formed with the elastic member, and is here made of rubber. The confirmation part 43 is good in the color different from the other site | part of the main body 21 increasingly. For example, the confirmation unit 43 may be colored yellow.

  Next, the lid 26 will be described. As shown in FIG. 3, the lid 26 is detachably provided in the main body 21, and is a member that switches the flow path of sewage flowing through the main body 21 by being attached to and detached from the main body 21. FIG. 9 shows a state in which the lid body 26 is disposed at the second switching position B, and is a plan view of the drain 20. FIG. 10 shows a state in which the lid body 26 is disposed at the second switching position B, and is a front sectional view of the drain 20. 3 to 5 show a state in which the lid body 26 is arranged at the first switching position A. FIG. The lid body 26 can be changed in position between the first switching position A (see FIG. 3) and the second switching position B (see FIG. 9) in the main body 21. As shown in FIG. 5, the first switching position A is provided in the main body 21, and the inlet 32 and the first outlet are arranged so that the sewage flowing from the inlet 32 flows to the first outlet 33. 33 is a position for communicating with 33. As shown in FIG. 10, the second switching position B is provided in the main body 21 and the inlet 32 and the second outlet so that the sewage flowing from the inlet 32 flows to the second outlet 34. 34 is a position where the communication with 34 is established. Here, the lid body 26 is provided so that the second outlet 34 of the main body 21 can be opened and closed. As shown in FIG. 5, the lid body 26 closes the second outlet 34 when arranged at the first switching position A. At this time, as shown in FIG. 3, the lid body 26 is arranged at the central portion in the inspection port 31 in plan view. On the other hand, as shown in FIG. 10, the lid body 26 opens the second outlet 34 when it is disposed at the second switching position B. At this time, as shown in FIG. 9, the lid body 26 is disposed in the central portion in the inspection port 31 in a plan view. That is, before and after the flow path of the sewage flowing through the main body 21 is switched, the lid body 26 is disposed at the central portion in the inspection port 31 in plan view.

  FIG. 11 is a plan view of the lid body 26. FIG. 12 is a front view of the lid body 26. FIG. 13 is a side view of the lid body 26. FIG. 14 is a bottom view of the lid body 26. 11 to 14, reference signs F, Rr, L, and R indicate the direction of the lid body 26 at the first switching position A. As shown in FIG. 12, the lid body 26 includes an invert part 51, a protruding part 52, a grip part 53, and a fitting convex part 54.

  As shown in FIG. 5, when the lid body 26 is disposed at the first switching position A, the invert portion 51 serves as a flow path for flowing sewage flowing into the main body 21 from the inflow port 32 to the first outflow port 33. It is. When the lid body 26 is disposed at the first switching position A, the invert unit 51 connects the inlet 32 and the first outlet 33. As shown in FIG. 13, the invert portion 51 is formed in a substantially U shape so as to be smoothly continuous with the bottom surface of the inflow port 32 and the bottom surface of the first outflow port 33. The invert part 51 is a groove between the inlet 32 and the first outlet 33. Here, as shown in FIG. 11, the invert part 51 is a straight groove. However, the invert portion 51 may be a groove that is partially curved. When the lid body 26 is disposed at the second switching position B, the end portion 51 a of the invert portion 51 is further disposed in the support groove 42 of the main body 21. Therefore, the outer peripheral surface of the end portion 51 a of the invert portion 51 may have a shape corresponding to the support groove 42. Here, the outer peripheral shape of the invert portion 51 is an arc shape.

  As shown in FIG. 3, the protruding portion 52 is a portion that is supported by the step portion 41 when the lid body 26 is disposed at the first switching position A. As shown in FIG. 11, the protruding portion 52 protrudes outward from the side portion of the invert portion 51. Specifically, as shown in FIG. 13, the protruding portion 52 is provided in the invert portion 51 so as to protrude outward from the upper ends of the front portion and the rear portion of the invert portion 51. As shown in FIG. 3, the protruding portion 52 has a shape that matches the stepped portion 41 of the main body 21. However, the protruding portion 52 may not have a shape that matches the stepped portion 41, and in this case, the protruding portion 52 is preferably smaller than the stepped portion 41. Here, the protrusion 52 is plate-shaped and has an arc shape.

  As shown in FIG. 11, the grip part 53 is a part that is used when an operator switches the position of the lid body 26 and can be gripped. The grip part 53 is disposed so as to straddle the invert part 51. The grip portion 53 is provided at the central portion of the invert portion 51 in the flow path direction L51 (see FIG. 14) of the invert portion 51. The shape of the grip part 53 is not particularly limited. Here, as shown in FIG. 13, the grip portion 53 has a shape that bridges the two upper ends of the invert portion 51. The grip part 53 may be integrated with the invert part 51 or may be a separate body. Here, as shown in FIG. 11, reinforcing members 53 a are provided at both end portions 51 a of the invert portion 51. The reinforcing member 53 a is provided so as to bridge the upper right ends of the invert portions 51 and the upper left ends of the invert portions 51. By this reinforcing member 53a, the invert part 51 can be made difficult to deform. Since the reinforcing member 53a can be gripped, the reinforcing member 53a may be used as a part used when the operator switches the position of the lid body 26, similarly to the grip portion 53.

  As shown in FIG. 5, the fitting convex portion 54 is a portion that closes the second outlet 34 when the lid body 26 is disposed at the first switching position A. Here, the fitting convex part 54 is a site | part which can be fitted to the 2nd outflow cylindrical part 21d of the main body 21 more and more. As shown in FIG. 14, the fitting convex portion 54 is substantially cylindrical. In the present embodiment, as shown in FIG. 13, a rubber seal member 54 a is provided on the outer peripheral surface of the fitting convex portion 54. A seal between the second outflow cylindrical portion 21d and the fitting convex portion 54 is achieved by the seal member 54a.

  As shown in FIG. 10, the overflow prevention plate 55 is provided in the main body 21 to block sewage from flowing into the first outlet 33 when the lid body 26 is disposed at the second switching position B. It is something to stop. Specifically, when the lid body 26 is disposed at the second switching position B, the overflow prevention plate 55 causes the sewage that has flowed into the main body 21 from the inlet 32 to pass through the second outlet 34 and the first flow This is a portion that prevents the flow to the outlet 33. As shown in FIG. 12, the overflow prevention plate 55 is formed of a flat member. The width of the overflow prevention plate 55 becomes shorter toward the lower part. Here, the shape of the overflow prevention plate 55 is a semi-elliptical shape with a bent lower edge. As shown in FIG. 14, the surface on the inlet 32 side of the overflow prevention plate 55 when the lid body 26 is disposed at the second switching position B (front surface in FIG. 14) of the overflow prevention plate 55. The shape is concave toward the thickness direction L55 toward the center in the width direction (vertical direction in FIG. 14). Here, in the overflow prevention plate 55, the surface on the first outlet 33 side (the rear surface in FIG. 14) of the overflow prevention plate 55 when the lid body 21 is disposed at the second switching position B is also wide. As it goes to the center of the direction, it has a shape recessed toward the thickness direction L55. In other words, when viewed from the bottom, the overflow prevention plate 55 becomes thinner toward the center in the width direction.

  As shown in FIG. 12, the overflow prevention plate 55 is formed integrally with the lid body 26. Here, the overflow prevention plate 55 is provided so as to extend downward from the bottom of the invert portion 51 of the lid body 26. As shown in FIG. 14, the overflow preventing plate 55 is provided at the central portion of the invert 51 and at the central portion of the fitting convex portion 54 in the bottom view. The overflow prevention plate 55 is disposed so as to be surrounded by the fitting convex portion 54. Here, in the bottom view, the thickness direction L55 of the overflow prevention plate 55 is orthogonal to the flow path direction L51 of the invert portion 51. The overflow prevention plate 55 is provided in the invert portion 51 of the lid body 26 so that the width direction of the overflow prevention plate 55 and the sewage flow direction L51 in the invert portion 51 are the same direction. The overflow prevention plate 55 and the invert part 51 are integrally formed. However, the overflow prevention plate 55 and the invert portion 51 may be separate and the overflow prevention plate 55 may be attached to the invert portion 51. In the present embodiment, the overflow prevention plate 55 corresponds to the “overflow prevention means” of the present invention.

  Next, the positional relationship between the lid body 26 and the main body 21 when the lid body 26 is disposed at the first switching position A and the second switching position B will be described in detail. As shown in FIG. 3, when the lid body 26 is disposed at the first switching position A, the protruding portion 52 of the lid body 26 is further disposed at the stepped portion 41 of the main body 21. The lid body 26 is supported by the step portion 41. At this time, the lid body 26 is disposed at a central portion in the inspection port 31 in plan view. The lid body 26 is disposed at a position overlapping the center point L31 of the inspection port 31 in plan view. Here, the central axis L26 of the lid body 26 and the central axis L31 of the inspection port 31 coincide with each other. At this time, the invert part 51 of the lid body 26 connects the inflow port 32 and the first outflow port 33, and serves as a sewage flow path. Both ends 51a of the invert part 51 are disposed on the central axis L32 of the inflow port 32 (in other words, the central axis L33 of the first outflow port 33). As shown in FIG. 5, the fitting convex portion 54 of the lid body 26 is further fitted to the second outflow cylindrical portion 21 d of the main body 21. Therefore, when the lid body 26 is disposed at the first switching position A, the lid body 26 is increasingly fixed to the main body 21 and cannot swing. At this time, the overflow prevention plate 55 is disposed so that the surface thereof is more or less oriented in the front-rear direction of the main body 21. Further, at this time, as shown in FIG. 4, the lower portion of the overflow prevention plate 55 is arranged in the second outflow cylindrical portion 21 d of the main body 21. A lower portion of the overflow prevention plate 55 projects downward from the second outlet 34.

  In the present embodiment, as described above, when the lid body 26 is disposed at the first switching position A, it is confirmed whether the protruding portion 52 of the lid body 26 is correctly placed on the stepped portion 41 of the main body 21. 43. FIG. 15 is a cross-sectional view of the protrusion 52 and the step 41 showing a state in which the protrusion 52 is correctly placed on the step 41. FIG. 16 is a cross-sectional view of the protruding portion 52 and the stepped portion 41 showing a state in which the protruding portion 52 is not correctly placed on the stepped portion 41.

  As shown in FIG. 15, when the protruding portion 52 of the lid body 26 is correctly placed on the stepped portion 41, the tip end portion 43 a of the confirmation portion 43 is located above the protruding portion 52. In this case, as shown in FIG. 3, the front end portion 43a of the confirmation unit 43 can be visually observed in a plan view. On the other hand, as shown in FIG. 16, when the protruding portion 52 is not correctly placed on the stepped portion 41 and is placed slightly deviated with respect to the stepped portion 41, the confirmation portion 43 is bent. Therefore, the tip portion 43 a of the confirmation portion 43 is located between the protruding portion 52 and the step portion 41. In this case, the tip end portion 43a of the confirmation unit 43 cannot be viewed in plan view. As described above, in the present embodiment, it is possible to determine whether or not the lid body 26 is correctly arranged at the first switching position A depending on whether or not the distal end portion 43a of the confirmation unit 43 is visible in a plan view. it can.

  As shown in FIG. 9, when the lid body 26 is arranged at the second switching position B, the end portion 51 a of the invert portion 51 of the lid body 26 in the flow path direction L <b> 51 (see FIG. 14) It is mounted on 42 and supported so as to be swingable. At this time, the lid body 26 is swingably supported by the support groove 42. As shown in FIG. 10, when the lid body 26 is disposed at the second switching position B, the lid body 26 is disposed at a higher position than at the first switching position A (see FIG. 5). At this time, similarly to the case where the lid 26 is arranged at the first switching position A, the lid body 26 is arranged at the central portion in the inspection port 31 in a plan view as shown in FIG. It is arranged at a position overlapping the center point L31 of 31. Here, the central axis L26 of the lid body 26 and the central axis L31 of the inspection port 31 coincide with each other. At this time, both ends of the invert part 51 are orthogonal to the central axis L32 of the inflow port 32 (in other words, the central axis L33 of the first outflow port 33) in plan view and pass through the central point L31 of the inspection port 31. It arrange | positions on the straight line L1.

  At this time, as shown in FIG. 10, the overflow prevention plate 55 is disposed so as to face the first outlet 33. Specifically, in the overflow prevention plate 55, the thickness direction L55 (see FIG. 14) of the overflow prevention plate 55 is the same as the axial direction L33 of the first outlet 33 (in other words, the axial direction L32 of the inlet 32). The overflow prevention plate 55 is arranged on the main body 21 so as to be in the direction. The overflow prevention plate 55 is arranged so that its surface is directed to the left-right direction of the main body 21. The fitting convex portion 54 of the lid body 26 is positioned higher than the second outflow cylindrical portion 21d of the main body 21 and is not fitted into the second outflow cylindrical portion 21d. Here, the lid body 26 is increasingly supported by the main body 21 only when the end portion 51 a of the invert portion 51 is placed in the support groove 42. The lid body 26 can swing with respect to the support groove 42 of the main body 21. The position and angle of the overflow prevention plate 55 can be changed by swinging the lid body 26 along the support groove 42. Here, the overflow prevention plate 55 is disposed between the inflow port 32 and the first outflow port 33 when the lid body 26 is disposed at the second switching position B. The overflow prevention plate 55 swings in a direction approaching the first outlet 33 (in other words, a direction away from the inlet 32) and in a direction away from the first outlet 33 (in other words, a direction closer to the inlet 32). It is configured to be movable.

  FIG. 17 is a view showing a state where the lid body 26 is swung with respect to the main body 21. When the sewage flows into the main body 21 from the inlet 32 in the state where the lid 26 is disposed at the second switching position B, the sewage passes over the lid 26 above the second outlet 34. It strikes against the flow prevention plate 55. At this time, the lid body 26 rotates to the first outlet 33 side. And the lower part of the overflow prevention plate 55 is the connection part 23 (in other words, 2nd outflow cylinder) by the side of the 1st outflow cylindrical part 21c among the connection parts of the vertical cylindrical part 21a and the 2nd outflow cylindrical part 21d. The upper edge portion 23 d connected to the first outlet 33 in the upper edge portion of the shape portion 21 d comes into contact. Here, the tip of the overflow prevention plate 55 is located below the upper end of the second outflow cylindrical portion 21d. Thus, the overflow prevention plate 55 is disposed at a position where the first outlet 33 is closed. The first inflow port 33 is blocked by the overflow prevention plate 55. The state where the first outlet 33 is “blocked” by the overflow prevention plate 55 is not limited to the state where the first outlet 33 is completely blocked by the overflow prevention plate 55. A state in which a part of the first outlet 33 is blocked by the overflow prevention plate 55 is also included. By this, when the lid body 26 is arranged at the second switching position B, the sewage that has flowed into the main body 21 from the inlet 32 flows beyond the second outlet 34 to the first outlet 33. Can be prevented.

  In the present embodiment, when the lid body 26 is disposed at the second switching position B, the sewage that has flowed into the main body 21 from the inlet 32 hits the overflow prevention plate 55, so that the lid body 26 has the support groove. Swings relative to 42. Here, when the lower portion of the overflow prevention plate 55 comes into contact with the connection portion 23, the overflow prevention plate 55 is maintained at that position by the frictional resistance between the invert portion 51 of the lid body 26 and the support groove 42. ing. In other words, the drain 20 is provided with a maintenance mechanism that maintains this closed state when the overflow prevention plate 55 closes the first outlet 33. However, when sewage no longer flows into the main body 21 from the inlet 32, the contact of the overflow preventing plate 55 with the upper edge portion 23 of the second outflow cylindrical portion 21d may be released. Thereafter, the overflow prevention plate 55 may be arranged in a state extending in the vertical direction as shown in FIG. In such a configuration, a weight may be provided below the overflow prevention plate 55. Further, a mechanism such as a bearing may be provided between the invert portion 51 and the support groove 42 of the lid 26 to reduce the frictional resistance between the invert portion 51 and the support groove 42. Thus, in the state where the overflow prevention plate 55 closes the first inlet 33, when the sewage does not flow into the main body 21 from the inlet 32, the overflow prevention plate 5 is shown in FIG. Thus, it becomes easy to arrange in the state extended in the up-and-down direction.

  As shown in FIG. 2, the storage tank 70 is a tank that stores sewage discharged from the drainage facility 5. The storage tank 70 is constituted by a tank and has a space sealed inside. A drain port 71 is formed in the upper part of the side surface of the storage tank 70. The drain outlet 71 is connected to the downstream end of the second outlet pipe 13, and the second outlet 34 of the drain 20 is connected via the second outlet pipe 13.

  A cylinder 78 protrudes from the upper surface of the storage tank 70 in the vertical direction. The cylinder 78 is provided on the upper surface of the storage tank 70 so that the upper end is substantially the same height as the ground. An operator can maintain and inspect the inside of the storage tank 70 through the cylinder 78. Note that the upper portion of the cylinder 78 is closed by a lid 79 in a normal state.

  Next, a method for using the drainage system 1 and the drainage basin 20 according to the present embodiment will be described. As shown in FIG. 1, the drainage system 1 normally discharges sewage discharged from the drainage facility 5 to the sewage main 15, and when a disaster such as an earthquake or tsunami occurs and the sewage main 15 is damaged, It is used so that the flow path of the sewage flowing through the drainage basin 20 is switched and the sewage flowing out from the drainage facility 5 is discharged to the storage tank 70. In the following description, a normal usage mode is referred to as a normal mode, and a disaster usage mode is referred to as a disaster mode.

  In the normal mode, as shown in FIG. 3, the lid body 26 is disposed in the main body 21 at the first switching position A where the inlet 32 and the first outlet 33 communicate with each other. Specifically, the fitting convex portion 54 of the lid body 26 is further fitted into the second outflow cylindrical portion 21 d of the main body 21, and the protruding portion 52 of the lid body 26 is further placed on the stepped portion 41 of the main body 21. In addition, the overflow prevention plate 55 is arranged so that the surface thereof is more or less oriented in the front-rear direction of the main body 21.

  In the normal mode, as shown in FIG. 1, the sewage flowing out from the drainage facility 5 flows into the main body 21 from the inlet 32 of the drainage basin 20 after flowing through the inflow conduit 11. As shown in FIG. 3, the sewage that has flowed into the main body 21 passes through the invert portion 51 of the lid body 26 and flows out of the main body 21 from the first outlet 33. At this time, as shown in FIG. 5, the second outlet 34 is closed by the lid body 26. Therefore, the sewage in the main body 21 does not flow to the second outlet 34. As shown in FIG. 2, the sewage flowing out from the first outlet 33 flows through the first outlet pipe 12 and is discharged to the sewage main pipe 15. The sewage discharged to the sewage main 15 is guided to a sewage treatment plant or the like and purified.

  In the disaster mode, the position of the lid body 26 is changed from the first switching position A to the second switching position B where the inlet 32 and the second outlet 34 communicate with each other. For example, the position of the lid body 26 can be changed as follows. First, the operator removes the lid 18 placed on the inspection cylinder 17. Next, as shown in FIG. 5, the operator holds the grip portion 53 of the lid body 26 and pulls up the lid body 26. Then, as shown in FIG. 9, the operator rotates the lid 26 by 90 degrees so that the end 51 a of the inverted portion 51 of the lid 26 is positioned above the support groove 42 of the main body 21. The direction of rotation at this time may be clockwise or counterclockwise. The operator places the lid body 26 at the second switching position B by placing the end portion 51 a of the invert portion 51 in the support groove 42. At this time, the overflow prevention plate 55 is disposed so that its surface is more or less oriented in the left-right direction of the main body 21.

  In the disaster mode, as shown in FIG. 1, the sewage flowing out from the drainage facility 5 flows into the main body 21 from the inlet 32 after flowing through the first outlet pipe 11. As shown in FIG. 17, the sewage that has flowed into the main body 21 collides with the overflow prevention plate 55 of the lid 26, whereby the lid 26 rotates toward the first outlet 33. And the lower part of the overflow prevention board 55 contacts the connection part 23 of the vertical cylindrical part 21a and the 2nd outflow cylindrical part 21d. As a result, the first outlet 33 is blocked by the overflow prevention plate 55. Therefore, more and more sewage in the main body 21 flows toward the second outlet 34 along the inclined portion 22 of the main body 21 and does not flow to the first outlet 33. Thereafter, as shown in FIG. 2, the sewage flows out of the main body 21 from the second outlet 34. The sewage flowing out from the second outlet 34 is discharged to the storage tank 70 through the second outflow pipe 13 and stored in the storage tank 70. The sewage stored in the storage tank 70 is sucked up by, for example, a suction pump. In this case, the operator removes the lid 79 that closes the upper portion of the cylinder 78 provided on the upper surface of the storage tank 70. Then, the suction pump is inserted into the storage tank 70 through the cylinder 78. Then, the sewage stored in the storage tank 70 is sucked up by the suction pump.

  As described above, in this embodiment, even if the first outflow pipe 12 or the sewage main pipe 15 is damaged, the inflow pipe line is connected to the inflow pipe from the drainage facility 5 by switching the sewage flow path with the drainage basin 20. 11 can be discharged from the second outlet pipe 13 to the storage tank 70 through the drain 20.

  In the present embodiment, as shown in FIG. 10, by arranging the lid body 26 at the second switching position B, the inlet 32 and the second outlet 34 of the main body 21 communicate with each other. At this time, as shown in FIG. 17, the overflow prevention plate 55 prevents the sewage in the main body 21 from flowing to the first outlet 33. As a result, when the lid 26 is disposed at the second switching position B, the sewage flows to the first outlet 33 even if the sewage flows into the main body 21 from the inlet 32. Can be prevented.

  By attaching / detaching the lid 26 to / from the second outlet 34, the second outlet 34 can be closed or opened by the lid 26. Therefore, the flow path of the sewage flowing through the main body 21 can be switched with a simple configuration in which the second outlet 34 is closed or opened by the lid 26. In the present embodiment, the operator can open and close the second outlet 34 by operating the lid body 26 through the inspection port 31. Therefore, the operator can easily switch the flow path of the sewage.

  As shown in FIGS. 12 and 13, the overflow prevention plate 55 is formed integrally with the lid body 26. As shown in FIG. 17, when the lid body 26 is disposed at the second switching position B, the overflow prevention plate 55 blocks the first outlet 33. Accordingly, the first outlet 33 is blocked by the overflow prevention plate 55 only by changing the position of the lid body 26 from the first switching position A to the second switching position B. Therefore, it is not necessary to separately perform the operation of changing the position of the lid body 26 and the operation of changing the position of the overflow prevention plate 55.

  As shown in FIG. 3, the lid body 26 includes an invert portion 51 that connects the inflow port 32 and the first outflow port 33 when arranged at the first switching position A. Thus, when the lid body 26 is disposed at the first switching position A, the sewage can smoothly flow from the inlet 32 to the first outlet 33 by the invert portion 51. Accordingly, when the lid body 26 is disposed at the first switching position A with one member (that is, the lid body 26, the overflow prevention plate 55, and the invert portion 51 that are integrated with each other), A flow path that smoothly guides sewage to the first outlet 33 can be secured, and the first outlet 33 can be closed when the lid body 26 is disposed at the second switching position B. Therefore, the number of parts can be reduced.

  As shown in FIGS. 10 and 17, the overflow prevention plate 55 is disposed between the inflow port 32 and the first outflow port 33 when the lid body 26 is disposed at the second switching position B. The first outlet 33 is configured to be swingable in a direction approaching the first outlet 33 and a direction away from the first outlet 33. Accordingly, as shown in FIG. 17, when the lid body 26 is disposed at the second switching position B, the overflow prevention plate 55 is disposed between the inflow port 32 and the first outflow port 33. When sewage flows into the main body 21 from the inflow port 32, the sewage collides with the overflow prevention plate 55. Since the overflow prevention plate 55 is configured to be swingable, at this time, the overflow prevention plate 55 that has collided with sewage moves in a direction approaching the first outlet 33, so that the first outlet 33 is sufficiently Can be blocked. When the lid body 26 is disposed at the second switching position B and sewage is going to flow back into the main body 21 from the first outlet 33, the sewage going backflow hits the overflow prevention plate 55. As a result, the overflow prevention plate 55 moves in a direction away from the first outlet 33. Therefore, since the 1st outflow port 33 is open | released, the sewage which is going to flow backward can be smoothly flowed to the 2nd outflow port 34. FIG. Therefore, it is possible to prevent sewage from accumulating in the first outflow pipe 12 (see FIG. 1) connected to the first outlet 33.

  As shown in FIG. 10, when the lid body 26 is disposed at the second switching position B, the lower portion of the overflow prevention plate 55 is disposed in the second outflow cylindrical portion 21 d of the main body 21. And as shown in FIG. 17, the center part of the lower end of the overflow prevention board 55 is the 1st outflow port 33 among the upper edge parts of the 2nd outflow cylindrical part 21d, when the overflow prevention board 55 rock | fluctuates. It is possible to contact the upper edge portion 23 connected to. As a result, when the lid body 26 is disposed at the second switching position B, the sewage that has flowed into the main body 21 from the inlet 32 collides with the overflow prevention plate 55, so that the overflow prevention plate 55 becomes the first flow. It swings in a direction approaching the outlet 33. At this time, the central portion of the lower end of the oscillating overflow preventing plate 55 comes into contact with the upper edge 23 connected to the first outlet 33 in the upper edge of the second outflow cylindrical portion 21d of the main body 21. As a result, it is possible to prevent sewage from flowing to the first outlet 33 and to secure a flow path of sewage flowing from the inlet 32 to the second outlet 34.

  As shown in FIG. 7, when the lid body 26 is disposed at the second switching position B (see FIG. 17) and the overflow prevention plate 55 swings, the main body 21 has the tip of the overflow prevention plate 55 positioned at the first position. A support groove 42 that supports the lid 26 so as to close the first outlet 33 is provided below the upper end of the two outflow cylindrical portions 21d. Accordingly, when the cover body 26 is disposed at the second switching position B and the overflow prevention plate 55 swings, the overflow body 55 is supported by the support groove 42 together with the cover body 26. The tip of the prevention plate 55 is positioned below the upper end of the second outflow cylindrical portion 21d. Therefore, at this time, the first outlet 33 can be sufficiently blocked by the overflow prevention plate 55.

  As shown in FIG. 6, two support grooves 42 are provided on the inner surface of the vertical cylindrical portion 21 a of the main body 21 so as to face each other across the second outlet 34 in a plan view. Accordingly, the lid body 26 can be stably supported by the two support grooves 42.

  As shown in FIG. 7, the support groove 42 is an arc-shaped groove recessed downward. As shown in FIG. 9, the end of the invert part 51 of the lid 26 in the flow direction L51 (see FIG. 14) is supported by the support groove 42 when the lid 26 is disposed at the second switching position B. ing. As a result, when the lid body 26 is disposed at the second switching position B, even if the invert portion 51 is to be disposed at a position slightly deviated from the support groove 42, the invert portion 51 extends along the arc-shaped support groove 42. It is easy to be guided to the correct placement position. Therefore, even if the invert portion 51 is disposed at a position slightly deviated from the support groove 42, the invert portion 51 can be correctly disposed in the support groove 42.

  As shown in FIG. 13, the overflow prevention plate 55 is formed in a plate shape. Thereby, the thickness of the overflow prevention plate 55 can be suppressed. Therefore, when the lid body 26 is disposed at the second switching position B, the overflow prevention plate 55 blocks the sewage from flowing into the first outlet 33, and the sewage flow path flowing to the second outlet 34 is reduced. Easy to secure.

  As shown in FIG. 6, in the plan view, the two support grooves 42 are arranged so as to face each other across the central axis L33 of the first outlet 33 (in other words, the central axis L32 of the inlet 32). It is provided on the inner surface of the main body 21. As shown in FIG. 14, the flow path direction L51 of the invert part 51 and the thickness direction L55 of the overflow prevention plate 55 are orthogonal to each other when viewed from the bottom. As shown in FIG. 10, the overflow prevention plate 55 is disposed so as to face the first outlet 33 when the lid body 26 is disposed at the second switching position B. Specifically, when the lid 26 is disposed at the second switching position B, the overflow prevention plate 55 is arranged such that the thickness direction L55 is the same as the axial direction L33 of the first outlet 33 in plan view. It is arranged in the main body 21. In the present embodiment, when the lid body 26 is disposed at the second switching position B, the first outlet 33 can be closed by a surface having a large surface area of the overflow prevention plate 55. Therefore, when the lid body 26 is disposed at the second switching position B, it is possible to more reliably block the sewage from flowing into the first outlet 33.

  In the present embodiment, the second outflow cylindrical portion 21d of the main body 21 has a cylindrical shape. As shown in FIG. 12, the overflow prevention plate 55 has a semi-elliptical shape with a bent lower edge. For example, when the overflow prevention plate 55 has a rectangular shape, only the corner of the overflow prevention plate 55 contacts the second outflow cylindrical portion 21d when the lid body 26 is disposed at the second switching position B and swings. To do. As a result, a large gap connected to the first outlet 33 tends to occur between the overflow prevention plate 55 and the second outflow cylindrical portion 21d. There is a possibility that sewage flows from the large gap to the first outlet 33. However, in this embodiment, since the overflow prevention plate 55 has a semi-elliptical shape, the contact area between the overflow prevention plate 55 and the second outflow cylindrical portion 21d can be increased. Therefore, compared with the case where the overflow prevention plate 55 has a rectangular shape, the gap formed between the overflow prevention plate 55 and the second outflow cylindrical portion 21d can be eliminated or reduced. Therefore, compared with the case where the overflow prevention plate 55 is rectangular, it is possible to further prevent the sewage from flowing to the first outlet 33 when the lid body 26 is disposed at the second switching position B. .

  As shown in FIG. 14, the surface on the inflow port 32 side of the overflow prevention plate 55 when the lid body 26 is disposed at the second switching position B is directed toward the thickness direction L55 toward the center in the width direction. It has a concave shape. As a result, the thickness of the central portion in the width direction of the overflow prevention plate 55 can be suppressed. Therefore, when the lid body 26 is disposed at the second switching position B, it is easy to secure a flow path of sewage flowing to the second outlet 34 while closing the first outlet 33 by the overflow prevention plate 55.

  The drainage system 1 according to this embodiment has been described above. However, the drainage system according to the present invention is not limited to the drainage system 1 according to the present embodiment, and can be implemented in various other forms.

<Other embodiments>
In the above embodiment, the second outlet 34 is provided at the bottom of the main body 21 so as to open downward. However, the second outlet 34 may be provided on the side of the main body 21 so as to open to the side. At this time, the second outlet 34 may be disposed below the first outlet 33.

  In the above embodiment, the overflow prevention means of the present invention is the flat overflow prevention plate 55. However, the overflow prevention means of the present invention is not limited to a flat member. For example, the shape of the overflow prevention means may be a shape like a semi-elliptical sphere.

  In the above embodiment, the overflow prevention plate 55 has a semi-elliptical shape with a bent lower edge. However, the shape of the overflow prevention plate 55 is not particularly limited, and for example, the lower portion may be a square shape or a trapezoidal shape. In addition, a flexible member such as rubber may be provided on the periphery of the overflow prevention plate 55. Thus, when the sewage flows into the main body 21 from the inlet 32 in the state where the lid body 26 is disposed at the second switching position B, the sewage is caused to flow into the first outlet by the overflow prevention plate 55. It is possible to suitably prevent the current from flowing to 33.

  Moreover, the overflow prevention board 55 may be comprised so that a middle part may bend. Accordingly, when sewage flows from the inlet 32 into the main body 21 in a state where the lid body 26 is disposed at the second switching position B, the overflow prevention plate 55 blocks the first outlet 33. easy.

  A recess may be provided on the surface of the overflow prevention plate 55 on the inlet 32 side, or a flange such as a rib may be provided. As a result, when the lid body 26 is disposed at the second switching position B and the sewage collides with the overflow prevention plate 55, the turbid water flow is easily disturbed, so that the sewage flows into the second outlet 34. Easy to flow.

  In the above embodiment, the overflow prevention plate 55 is provided in the central portion of the invert portion 51 in the bottom view. However, the arrangement position of the invert portion 51 on the overflow prevention plate 55 is not particularly limited. For example, the overflow prevention plate 55 may be provided closer to the first outlet 33 than the central portion of the invert portion 51 in a bottom view when the lid body 26 is disposed at the second switching position B. As a result, the space on the inlet 32 side below the invert portion 51 in a state where the lid body 26 is disposed at the second switching position B is widened. Therefore, even when the amount of sewage flowing into the main body 21 is increased when the lid 26 is disposed at the second switching position B, the sewage can be smoothly flowed to the second outlet 34. it can.

  In the above-described embodiment, the overflow prevention plate 55 has a thickness that decreases toward the center in the width direction when viewed from the bottom. However, the thickness of the overflow prevention plate 55 may be the same. In this case, the overflow prevention plate 55 has a shape that is curved toward the first outlet port 33 toward the center in the width direction when the lid body 26 is disposed at the second switching position B. Good. Thus, when the lid body 26 is disposed at the second switching position B, the sewage that hits the overflow prevention plate 55 can flow smoothly to the second outlet 34.

  In the above embodiment, as shown in FIG. 14, the thickness direction L55 of the overflow prevention plate 55 is orthogonal to the flow path direction L51 of the invert portion 51 in the bottom view. The overflow prevention plate 55 is provided in the invert portion 51 of the lid body 26 so that the width direction of the overflow prevention plate 55 and the flow direction L51 of the sewage in the invert portion 51 are the same direction. However, the overflow prevention plate 55 may be provided in the invert portion 51 so that the thickness direction L55 of the overflow prevention plate 55 is the same as the flow direction L51 of the invert portion 51. The width direction of the overflow prevention plate 55 may be orthogonal to the sewage flow path direction L51 in the invert portion 51. The overflow prevention plate 55 may be provided in the invert portion 51 so that the angle formed by the thickness direction L55 of the overflow prevention plate 55 and the flow direction L51 of the invert portion 51 is 45 degrees.

  In the above embodiment, the overflow prevention plate 55 is provided in the invert part 51 so as to extend downward from the bottom of the invert part 51 of the lid body 26. However, the overflow prevention plate 55 and the invert part 51 may be independent of each other. At this time, for example, when the lid body 26 is arranged at the second switching position B, the overflow prevention plate 55 is attached to the main body 21 so as to close the first outlet 33. There may be.

DESCRIPTION OF SYMBOLS 1 Drainage system 11 Inflow pipeline 12 1st outflow pipeline 13 2nd outflow pipeline 20 Drain 21 Mass body 26 Cover body 31 Inspection port 32 Inlet 33 First outflow 34 Second outflow 41 Stepped part 42 Support groove 45 Projection 51 Inverted part 52 Projected part 53 Gripping part 55 Overflow prevention plate (overflow prevention means)
70 Reservoir

Claims (14)

An inspection port opened upward, an inflow port formed on the side and into which drainage flows, a first outflow port formed on the side and from which drainage flows out, and a second flow formed at the bottom and from which drainage flows out An approximately cylindrical shaped main body having an outlet, and
The second outlet is provided in the main body so that the second outlet can be opened and closed, and the position can be changed between a first switching position that closes the second outlet and a second switching position that opens the second outlet. Possible lids,
An overflow preventing means provided in the main body and blocking drainage from flowing into the first outlet when the lid is disposed at the second switching position;
With
The lid body is separated from the main body to change the position between the first switching position and the second switching position, and the waste water flowing through the main body is switched . . The overflow prevention means is formed integrally with the lid,
The drainage according to claim 1, wherein when the lid is arranged at the second switching position, the overflow prevention means is arranged at a position closing the first outlet.   The overflow prevention means is disposed between the inflow port and the first outflow port when the lid body is disposed at the second switching position, and in a direction approaching the first outflow port. The drain according to claim 2, wherein the drain is configured to be swingable.   The main body supports the lid body so that the overflow prevention means closes the first outlet when the lid body is disposed at the second switching position and the overflow prevention means swings. Drainage according to claim 3, comprising a support. An inspection port opened upward, an inflow port formed on the side and into which drainage flows, a first outflow port formed on the side and from which drainage flows out, and a second flow formed at the bottom and from which drainage flows out An approximately cylindrical shaped main body having an outlet, and
The second outlet is provided in the main body so that the second outlet can be opened and closed, and the position can be changed between a first switching position that closes the second outlet and a second switching position that opens the second outlet. Possible lids,
An overflow preventing means provided in the main body and blocking drainage from flowing into the first outlet when the lid is disposed at the second switching position;
With
The overflow prevention means is formed integrally with the lid,
When the lid is disposed at the second switching position, the overflow prevention means is disposed at a position closing the first outlet,
The overflow prevention means is disposed between the inflow port and the first outflow port when the lid body is disposed at the second switching position, and in a direction approaching the first outflow port. It is configured to be swingable,
The main body supports the lid body so that the overflow prevention means closes the first outlet when the lid body is disposed at the second switching position and the overflow prevention means swings. With a support,
In the plan view, two of the support portions are provided on the inner surface of the main body so as to face each other across the second outlet, and drains. An inspection port opened upward, an inflow port formed on the side and into which drainage flows, a first outflow port formed on the side and from which drainage flows out, and a second flow formed at the bottom and from which drainage flows out An approximately cylindrical shaped main body having an outlet, and
The second outlet is provided in the main body so that the second outlet can be opened and closed, and the position can be changed between a first switching position that closes the second outlet and a second switching position that opens the second outlet. Possible lids,
An overflow preventing means provided in the main body and blocking drainage from flowing into the first outlet when the lid is disposed at the second switching position;
With
The overflow prevention means is formed integrally with the lid,
When the lid is disposed at the second switching position, the overflow prevention means is disposed at a position closing the first outlet,
The overflow prevention means is disposed between the inflow port and the first outflow port when the lid body is disposed at the second switching position, and in a direction approaching the first outflow port. It is configured to be swingable,
The main body is
A support portion for supporting the lid body so that the overflow prevention means closes the first outlet when the lid body is disposed at the second switching position and the overflow prevention means swings;
A vertical cylindrical portion in which the inflow port and the first outflow port are formed and extends in a vertical direction;
The second outflow port is formed, and the outflow tubular portion extending downward from the bottom of the vertical tubular portion;
Have
The overflow prevention means extends downward from the bottom of the lid,
When the lid is arranged at the second switching position, the lower part of the overflow prevention means is arranged in the outflow cylindrical part,
When the overflow prevention means swings, a part of the lower portion of the overflow prevention means can contact an upper edge portion connected to the first outlet of the upper edge portion of the outflow cylindrical portion. Drain.   The support portion is configured such that a tip of the overflow preventing means is positioned below an upper end of the outflow cylindrical portion when the cover body is disposed at the second switching position and the overflow preventing means swings. The drain according to claim 6, wherein the lid is supported.   The drain according to claim 6 or 7, wherein the lid includes an invert portion that connects the inlet and the first outlet when arranged at the first switching position. The support portion is an arc-shaped support groove recessed downward,
9. The drain according to claim 8, wherein both ends of the invert portion in the flow path direction are swingably supported by the support groove when the lid body is disposed at the second switching position. In plan view, the two support portions are provided so as to face each other across the central axis of the first outlet,
The overflow prevention means is formed in a plate shape,
The drainage according to claim 9, wherein in the plan view, the flow path direction of the invert portion and the thickness direction of the overflow prevention means are orthogonal to each other.   The drainage according to claim 10, wherein the overflow prevention means is disposed to face the first outlet when the lid is disposed at the second switching position. The outflow cylindrical part is cylindrical,
The drainage according to claim 10 or 11, wherein the overflow prevention means has a semi-elliptical shape with a bent lower edge.   When the lid is disposed at the second switching position, the surface on the inlet side of the overflow prevention means has a shape that is recessed in the thickness direction toward the center in the width direction. The drainage according to claim 12. When the drainage according to any one of claims 1 to 13,
An inflow conduit having an upstream end connected to the drainage facility and a downstream end connected to the inflow port;
An outflow conduit having an upstream end connected to the first outlet and a downstream end connected to a sewage main pipe;
A storage tank connected to the second outlet;
With drainage system.

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