JP2024031289A - lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid that has a penetration cylinder part formed with a penetration passage opened upward and downward and is provided on a conduit, which prevents rainwater from entering into the conduit through the penetration passage.

SOLUTION: A lid 10 includes a lid frame 20 provided in a conduit 1, a lid body 30 detachably mounted on the lid frame 20, a penetration cylinder part 40 which is provided in the lid body 30 and is formed with a penetration passage 41 opened upward and downward of the lid body 30, an opening/closing valve 60 which can open/close the lower end of the penetration passage 41, a side wall part 33 which is arranged so as to surround the penetration passage 41 in plan view and projects upward from the lid body 30, and a cover body 50 which is mounted on the lid body 30 so as to cover the penetration passage 41 and the side wall part 33 from above. The cover body 50 is formed with a communication hole 55 communicating with the penetration passage 41. The communication hole 55 is arranged below the upper end of the side wall part 33.

SELECTED DRAWING: Figure 3A

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a lid.

For example, Patent Document 1 discloses a lid that is attached to a drainage pipe line buried underground. This lid is attached to the opening above the cleaning port in the drain pipe. The lid includes a main body member that is detachably attached to the opening of the cleaning port, a communication pipe that is attached to the main body member and communicates the inside and outside of the cleaning port, and a cover member that covers the upper part of the communication pipe from above. It is equipped with The upper part of the communication tube projects upward from the main body member. The cover body is formed with an intake hole that communicates with the communication pipe and opens laterally.

For example, when waste water flows into a drain pipe, negative pressure may occur in the drain pipe. However, in the lid disclosed in Patent Document 1, air from outside the cleaning port enters the interior through the intake hole formed in the cover body and the communication pipe. This can make it difficult for the inside of the drain pipe to become negative pressure.

Japanese Patent Application Publication No. 11-172749

By the way, in the lid disclosed in Patent Document 1, rainwater accumulates on the lid when it rains. Heavy rainfall causes the water level to rise on the body member of the lid. At this time, if the water level becomes higher than the upper end of the communication pipe, rainwater may enter the drainage pipe through the communication pipe. It is preferable that rainwater is prevented from entering the drainage pipe through the communication pipe as much as possible.

The present invention has been made in view of the above, and an object of the present invention is to provide a lid provided on a conduit, which includes a through-cylindrical portion in which a through-hole is formed that is open upward and downward, and which allows rainwater to pass through the through-hole. To provide a lid that is difficult to get into a pipe.

The lid according to the present invention includes a lid frame, a lid body, a through cylinder portion, an on-off valve, a side wall portion, and a cover body. The lid frame is provided on the conduit. The lid body is removably attached to the lid frame. The through cylinder portion is provided in the lid, and has a through passage opened upward and downward of the lid. The opening/closing valve is capable of opening and closing the lower end of the through passage. The side wall portion is arranged so as to surround the through passage in a plan view, and protrudes upward from the lid body. The cover body is attached to the lid body so as to cover the through path and the side wall portion from above. A communication hole communicating with the through path is formed in the cover body. The communication hole is arranged below the upper end of the side wall portion.

According to the lid, a space is formed between the cover body and the side wall portion in an area in the vertical direction from the upper end of the communication hole of the cover body to the upper end of the side wall portion. When it rains, rainwater collects on the lid and the water level rises. Here, the water level rises to the position of the upper end of the communication hole of the cover body. For example, in a state where the opening/closing valve at the lower end of the through-hole is closed, a closed space is formed by the through-path and a space formed in an area in the vertical direction from the upper end of the communication hole to the upper end of the side wall. Therefore, the rainwater that has risen to the position of the upper end of the communication hole of the cover body becomes more difficult to rise than the position of the upper end of the communication hole due to the pressure generated in the closed space. Therefore, it is possible to make it difficult for rainwater to enter the pipe through the through passage.

According to a preferred aspect of the present invention, the communication hole opens laterally.

According to the above aspect, even if a person or a car rides on the cover body, for example, the communication hole opens toward the side, making it difficult for the communication hole to be blocked. can.

According to another preferred aspect of the present invention, the length of the communication hole in the circumferential direction is longer than the length in the vertical direction.

According to the above aspect, by increasing the length of the communication hole in the circumferential direction, more air can be taken into the pipe from the through-hole through the communication hole. Therefore, it is possible to make it easier to take in air. Further, according to the above aspect, by shortening the length of the communication hole in the vertical direction, the length of the cover body in the vertical direction can be shortened. Therefore, the length of the cover that projects upward from the lid can be shortened, making it difficult for people, cars, etc. to trip over the lid.

According to another preferred aspect of the present invention, of the space between the cover body and the side wall, a space from the upper end of the communication hole to the upper end of the side wall is defined as an intermediate space, and When the space above the upper end is defined as the upper space, the vertical distance of the middle space is shorter than the vertical distance of the upper space.

According to the above aspect, the upper space directly communicates with the through path. Therefore, by enlarging the upper space, more air can be taken into the through passage through the upper space at once. Therefore, it is possible to make it easier to take in air.

According to another preferred aspect of the present invention, a space between the cover body and the side wall portion from the lower end of the cover body to the upper end of the communication hole is defined as a lower space; When the space from the upper end to the upper end of the side wall portion is defined as a hollow space, the distance in the vertical direction of the hollow space is shorter than the distance in the vertical direction of the lower space.

According to the above aspect, the lower space directly communicates with the communication hole. Therefore, by enlarging the lower space, more air can be taken into the lower space from the communication holes at once. Therefore, it is possible to make it easier to take in air.

According to another preferred aspect of the present invention, the length of the side wall portion in the vertical direction is 1.1 times or more the distance in the vertical direction from the lower end of the cover body to the upper end of the communication hole.

According to the above aspect, by making the vertical length of the side wall portion 1.1 times or more the vertical distance from the lower end of the cover body to the upper end of the communication hole, The size of the space in the vertical direction up to the upper end of the side wall portion can be secured. Therefore, it is possible to secure a closed space formed by the space in the vertical direction from the upper end of the communication hole to the upper end of the side wall portion and the through path. Therefore, the rainwater that has risen to the position of the upper end of the communication hole of the cover body becomes more difficult to rise than the position of the upper end of the communication hole due to the pressure generated in the closed space. Therefore, it is possible to make it difficult for rainwater to enter the pipe through the through passage.

According to another preferred aspect of the present invention, the cover body has a covering portion that covers the through path and is arranged at a position overlapping the through path in a plan view and is spaced apart from the side wall portion.

According to the above aspect, no hole such as a communicating hole is formed in the covering portion of the cover body. Therefore, it is possible to make it difficult for rainwater falling on the covering portion to enter the through passage.

Advantageous Effects of Invention According to the present invention, it is possible to provide a lid that is provided on a conduit and includes a through-cylindrical portion in which a through-hole is formed that is open upwardly and downwardly, and that prevents rainwater from entering the conduit through the through-path. .

It is a top view showing a lid concerning an embodiment. It is a front view showing a lid concerning an embodiment. FIG. 2 is a sectional view of the lid taken along the line III-III in FIG. 1; FIG. 3B is an enlarged view of part A in FIG. 3A. FIG. 3A is a view corresponding to FIG. 3A showing a state in which the lid body is floating with respect to the lid frame. It is a bottom view of a lid body. It is a front view of a lid body. It is a top view which shows the lid in the state where a cover body is abbreviate|omitted. It is a perspective view showing a cover body. It is a figure which shows the state where the on-off valve closes the penetration path of a penetration cylinder part. It is a figure which shows the state in which the on-off valve opens the penetration path of a penetration cylinder part. FIG. 7 is a perspective view showing a cover body according to another embodiment.

Hereinafter, embodiments of the lid according to the present invention will be described with reference to the drawings. However, the embodiment described below is only one embodiment of the present invention, and is not intended to specifically limit the present invention, as a matter of course. In addition, members and portions that have the same function are given the same reference numerals, and redundant explanations are omitted or simplified as appropriate.

FIG. 1 is a plan view showing a lid 10 according to this embodiment. FIG. 2 is a front view showing the lid 10 according to this embodiment. FIG. 3A is a cross-sectional view of the lid 10 taken along the line III--III in FIG. FIG. 3B is an enlarged view of portion A of FIG. 3A. In each drawing, the symbol D1 indicates the vertical direction of the lid 10. As shown in FIG. 3A, the lid 10 is provided on the pipe line 1 buried underground. The conduit 1 has a standpipe 2. The standpipe 2 is buried underground and extends in the vertical direction D1. The type of standpipe 2 is not particularly limited. Here, the standpipe 2 is, for example, a manhole or a part of a cell.

Although not shown, the conduit 1 has a main conduit. The main pipe is connected to the lower end of the standpipe 2, and is a pipe that connects the standpipe 2 and the sewage main pipe. The main pipe line extends, for example, laterally, and is arranged along the direction intersecting the standpipe 2. Note that the main conduit may be composed of a plurality of pipes, cells, joints, etc., or may be composed of a single pipe.

In this embodiment, the lid 10 is provided at the upper end of the standpipe 2 of the conduit 1, as shown in FIG. 3A. The lid 10 includes a lid frame 20 and a lid body 30. The lid frame 20 is provided on the conduit 1. Here, the lid frame 20 is provided at the upper end of the standpipe 2 of the conduit 1. The lid frame 20 is fixed to the standpipe 2. Here, a through hole 25 penetrating in the vertical direction D1 is formed in the lid frame 20, and the lid frame 20 and the standpipe 2 communicate with each other through the through hole 25.

In this embodiment, the lid frame 20 has a frame tube portion 21 that is fitted into the standpipe 2, and a frame attachment portion 22 that extends upward from the frame tube portion 21 and to which the lid body 30 is detachably attached. . A lid body 30 is removably fitted into the frame attachment part 22. The frame attachment part 22 supports the lid body 30. The lid frame 20 has an engaged portion 23 that protrudes radially inward from the inner circumferential surface of the frame cylindrical portion 21 . The engaged portion 23 is formed in a ring shape. FIG. 4 is a view corresponding to FIG. 3A showing a state in which the lid body 30 is floating relative to the lid frame 20. Although details will be described later, as shown in FIG. 4, the engaged portion 23 is capable of engaging with a stopper 70 of the lid 10, and when the stopper 70 engages, the lid body 30 is moved upward. It regulates the

As shown in FIG. 3A, the lid body 30 is detachably attached to the lid frame 20. As shown in FIG. 1, the lid 30 has a circular shape when viewed from above. However, the shape of the lid 30 is not particularly limited. In this embodiment, the lid 10 has an intake function that takes in air outside the pipe 1 into the pipe 1 and an exhaust function that discharges the air inside the pipe 1 to the outside of the pipe 1. . Details of this intake function and exhaust function will be described later.

In this embodiment, as shown in FIG. 3A, a sealing member 31 is provided on the side surface of the lid body 30 at a portion that contacts the lid frame 20. FIG. 5 is a bottom view of the lid body 30 of the lid 10. FIG. 6 is a front view of the lid 30. In FIGS. 5 and 6, the lid frame 20 is omitted. As shown in FIG. 5, the seal member 31 is provided along the circumferential direction of the lid 30. As shown in FIG. The seal member 31 is ring-shaped. Note that the material for forming the seal member 31 is not particularly limited. Here, the seal member 31 is formed of an elastic member having a predetermined elastic force. For example, rubber can be used as the elastic member. As the rubber, synthetic rubber (eg, ethylene propylene rubber (EPDM)) can be suitably used. This sealing member 31 can improve the sealing performance between the lid 30 and the lid frame 20 when the lid 30 is attached to the lid frame 20.

In this embodiment, as shown in FIG. 3A, the lid 10 includes a through-cylindrical portion 40 and a cover body 50. The through cylinder portion 40 is provided in the lid body 30. The through cylinder portion 40 has a cylindrical shape extending in the vertical direction D1, and is open upward and downward of the lid body 30. The through cylinder portion 40 may be separate from the lid 30 or may be formed integrally with the lid 30. Further, the penetrating cylinder portion 40 may be composed of a plurality of members, and some of the plurality of members may be integrally formed with the lid body 30. Here, the penetrating cylinder part 40 has a cylindrical shape in which a part penetrates the lid 30 in the up-down direction D1 and the other part extends downward from the lid 30.

A through passage 41 is formed in the through cylinder portion 40 . The through passage 41 is through which air passes when air outside the conduit 1 enters the conduit 1. The through passage 41 is open upward and downward of the lid body 30. The through passage 41 vertically passes through the lid 30. In other words, the through passage 41 vertically passes through the through tube portion 40 and extends in the vertical direction D1. In this embodiment, air outside the pipe line 1 (for example, on the ground) can enter into the pipe line 1 through the through passage 41 of the through cylinder part 40. Here, the through passage 41 of the through-cylindrical portion 40 functions as an intake function for taking air outside the conduit 1 into the conduit 1.

In this embodiment, as shown in FIG. 5, the penetrating cylinder portion 40 is provided at a position eccentric to the lid body 30. Specifically, in the through-cylindrical portion 40, when viewed from the bottom (in other words, when viewed from above), the center C1 of the through-hole 41 (in other words, the center C1 of the through-cylindrical portion 40) is at a different position from the center C2 of the lid body 30. It is provided on the lid body 30 as shown in FIG. The through tube portion 40 is arranged such that the center C1 of the through path 41 (in other words, the through tube portion 40) is offset from the center C2 of the lid body 30. Here, in the bottom view (in other words, in plan view) of the through-tube portion 40, the center C1 of the through-hole 41 (in other words, the through-tube portion 40) is closer to the fixed stopper 90, which will be described later, than the center C2 of the lid body 30. It is provided on the lid body 30 so as to be positioned. That is, the through cylinder portion 40 is provided on the lid 30 so as to be eccentric toward the fixed stopper 90 with respect to the lid 30 .

In this embodiment, as shown in FIG. 3A, the lid 10 includes a side wall portion 33. The side wall portion 33 protrudes upward from the lid body 30 around the through passage 41 of the through cylinder portion 40 . FIG. 7 is a plan view showing the lid 10 with the cover body 50 omitted. As shown in FIG. 7, the side wall portion 33 is arranged to surround the through path 41 in plan view. The side wall portion 33 is formed in a cylindrical shape extending in the vertical direction D1. Here, as shown in FIG. 3A, the inner circumferential surface of the side wall portion 33 and the inner circumferential surface of the through-tube portion 40 are continuous.

The cover body 50 is provided on the top of the lid body 30. The cover body 50 is attached to the lid body 30 so as to cover the through tube portion 40 (in other words, the through path 41). Here, the cover body 50 is attached to the lid body 30 so as to cover the through-tube portion 40 and the through-path 41 from above. In plan view, the cover body 50 overlaps with the through cylinder portion 40. In this embodiment, the cover body 50 is configured to cover the side wall portion 33 together with the through cylinder portion 40 . The cover body 50 covers the side wall portion 33 from above, and at least a portion of the cover body 50 is disposed above the side wall portion 33. The upper end of the cover body 50 is arranged above the upper end of the side wall portion 33.

In this embodiment, as shown in FIG. 6, the cover body 50 is raised higher than the lid body 30. In other words, the cover body 50 projects higher than the lid body 30. In this embodiment, since the cover body 50 is attached to the upper surface of the lid body 30, the entire cover body 50 protrudes above the lid body 30. Further, as shown in FIG. 2, the cover body 50 is raised higher than the lid frame 20 and protrudes higher than the lid frame 20. The cover body 50 protrudes above the ground.

Note that the shape and configuration of the cover body 50 are not particularly limited. FIG. 8 is a perspective view showing the cover body 50. As shown in FIG. 8, the cover body 50 is formed in a so-called umbrella shape. In this embodiment, the cover body 50 has a covering portion 51, a side portion 52, and a shaft 53.

As shown in FIG. 3A, the covering portion 51 covers the through path 41 from above. Here, the covering portion 51 is configured to cover the side wall portion 33 together with the through path 41 from above. The covering portion 51 is arranged at a position overlapping the through path 41 in plan view. The covering part 51 is arranged above the side wall part 33 and is arranged so as to be spaced apart from the side wall part 33. Here, the covering portion 51 is spaced apart from the side wall portion 33 in the vertical direction D1. Note that the shape of the covering portion 51 is not particularly limited. In this embodiment, as shown in FIG. 1, the covering portion 51 has a circular shape in plan view. The covering portion 51 is formed into a dome shape that projects upward. As shown in FIG. 3A, the covering portion 51 has a space inside and opens downward.

The side portion 52 extends downward from the covering portion 51. Here, the side portion 52 has a cylindrical shape and is connected to the peripheral end of the covering portion 51.

As shown in FIG. 3A, the shaft 53 extends downward from the covering portion 51. Here, the shaft 53 is connected to the center of the covering part 51 and extends downward from the back surface of the covering part 51. In this embodiment, as shown in FIG. 8, the shaft 53 is a cylindrical rod, but it may also be a cylindrical rod. The cross-sectional shape of the shaft 53 is circular. However, the shape of the shaft 53 is not particularly limited. Here, as shown in FIG. 3A, the lower end of the shaft 53 is at the same position as the lower end of the side portion 52 in the vertical direction D1. However, the lower end of the shaft 53 may protrude below the lower end of the side part 52 or may be arranged above the lower end of the side part 52.

A communication hole 55 is formed in the cover body 50 . Here, the communication hole 55 is formed in the side part 52 and is formed to penetrate through the side part 52. Note that a hole such as the communication hole 55 is not formed in the covering portion 51. The communication hole 55 communicates with the inside of the through-cylindrical portion 40 , in other words, communicates with the through-path 41 of the through-cylindrical portion 40 . The communication hole 55 is a hole that connects the outside of the cover body 50 (here, the outside located above the cover body 50) and the through path 41. In this embodiment, the communication hole 55 does not open upward, but opens laterally.

Note that the number of communication holes 55 is not particularly limited. Here, as shown in FIG. 8, a plurality of communication holes 55 are formed in the cover body 50 (specifically, the side portion 52). Specifically, the number of communicating holes 55 is eight. The plurality of communication holes 55 are formed in the side portion 52 so as to be lined up along the circumferential direction of the cover body 50 . Here, the intervals between adjacent communication holes 55 are the same, but may be different.

The plurality of communicating holes 55 have the same size. However, some of the communication holes 55 may be different in size from other communication holes 55. In this embodiment, the plurality of communication holes 55 have the same length L11 (see FIG. 2) in the vertical direction D1 and the same length L12 (see FIG. 2) in the circumferential direction. Here, the circumferential direction refers to the circumferential direction of the cover body 50 (in other words, the side portion 52). As shown in FIG. 2, in one communication hole 55, the length L12 in the circumferential direction is longer than the length L11 in the vertical direction D1. For example, in one communication hole 55, the length L12 in the circumferential direction is 1.2 times or more, preferably 1.5 times or more, and more preferably twice or more the length L11 in the vertical direction D1.

In this embodiment, as shown in FIG. 3B, the communication hole 55 is arranged below the upper end of the side wall portion 33. In other words, the upper end of the communication hole 55 is located below the upper end of the side wall portion 33. Here, the length L21 of the side wall portion 33 in the vertical direction D1 is longer than the distance L22 in the vertical direction D1 from the lower end of the cover body 50 (in other words, the upper surface of the lid body 30) to the upper end of the communication hole 55. Here, the lower end of the cover body 50 is the lower end of the side portion 52. The distance L22 can be rephrased as the length of the communication hole 55 in the vertical direction D1. In this embodiment, the length L21 of the side wall portion 33 in the vertical direction D1 is 1.1 times or more the distance L22 in the vertical direction D1 from the lower end of the cover body 50 to the upper end of the communication hole 55, preferably 1. It is 2 times or more, particularly preferably 1.3 times or more.

Here, as shown in FIG. 3B, a space S10 is formed between the cover body 50 and the side wall portion 33. This space S10 is a space that communicates with the communication hole 55 and also communicates with the through path 41. In this embodiment, the space S10 includes a lower space S11, a middle space S12, and an upper space S13. The lower space S11 refers to the space from the lower end of the cover body 50 (specifically, the side portion 52) to the upper end of the communication hole 55 in the space S10. That is, the lower space S11 is a space within the height range of the communication hole 55. The middle space S12 refers to the space from the upper end of the communication hole 55 to the upper end of the side wall portion 33 in the space S10. The middle space S12 is a space within the height range of the portion of the side wall portion 33 that protrudes upward from the communication hole 55. The upper space S13 refers to the space above the upper end of the side wall portion 33 in the space S10. Here, the upper space S13 is a space within a height range from the upper end of the side wall portion 33 to the covering portion 51 of the cover body 50.

In this embodiment, the distance L32 in the vertical direction D1 of the middle space S12 is shorter than the distance L31 in the vertical direction D1 of the lower space S11. Here, the distance L32 is at most 0.9 times the distance L31, preferably at most 0.7 times the distance L31, particularly preferably at most 0.4 times the distance L31. For example, the distance L32 is 0.33 times the distance L31. However, it is possible to make the distance L32 the same as the distance L31, and it is also possible to make it longer than the distance L31. A distance L32 in the vertical direction D1 of the middle space S12 is shorter than a distance L33 in the vertical direction D1 of the upper space S13. Here, the distance L32 is at most 0.9 times the distance L33, preferably at most 0.7 times the distance L33, particularly preferably at most 0.5 times the distance L33. For example, the distance L32 is 0.46 times the distance L33. However, the distance L32 can be the same as the distance L33, or can be longer than the distance L33. In this embodiment, the distance L31 of the lower space S11 in the vertical direction D1 is longer than the distance L33 of the upper space S13 in the vertical direction D1. However, the distance L31 may be shorter than the distance L33, or may be the same as the distance L33.

In this embodiment, as shown in FIG. 7, the lid 10 includes a mounting portion 35 and a connecting portion 38. The attachment portion 35 is provided on the lid body 30. As shown in FIG. 3A, a cover body 50 is attached to the attachment portion 35. The cover body 50 is attached to the lid body 30 by being attached to the attachment part 35. Note that the position and configuration of the attachment portion 35 with respect to the lid body 30 are not particularly limited. In this embodiment, as shown in FIG. 7, the attachment part 35 is arranged inside the through-cylindrical part 40, that is, inside the through-path 41. The attachment portion 35 is disposed within the through passage 41 at a predetermined distance from the inner circumferential surface of the through cylinder portion 40 . Here, as shown in FIG. 3A, the attachment portion 35 extends in the vertical direction D1, and has a cylindrical outer circumferential shape.

In this embodiment, as shown in FIG. 7, the attachment portion 35 and the inner circumferential surface of the through-cylindrical portion 40 are connected by a connecting portion 38. The spanning portion 38 extends between the through-cylindrical portion 40 and the attachment portion 35 within the through-path 41 . The connecting portion 38 is connected to the inner circumferential surface of the penetrating tube portion 40 and the outer circumferential surface of the attachment portion 35 . Note that the shape of the connecting portion 38 is not particularly limited. Here, the connecting portion 38 is a rod-shaped member extending radially outward from the attachment portion 35 . The cross-sectional shape of the connecting portion 38 is rectangular, but is not particularly limited. The cross-sectional shape of the connecting portion 38 may be circular.

The number of passing sections 38 is also not particularly limited. Here, as shown in FIG. 7, the number of delivery sections 38 is four. The four spanning portions 38 are arranged along the circumferential direction of the attachment portion 35, and the intervals between adjacent spanning portions 38 in the circumferential direction are the same. Here, the four connecting portions 38 form a cross shape.

Note that, in a plan view, the proportion of the span portion 38 to the area of the through path 41 is not particularly limited. For example, in a plan view, the ratio of the span section 38 to the area of the through passage 41 is 1/2 or less, preferably 1/5 or less, and particularly preferably 1/8 or less.

In this embodiment, the total area of the communication holes 55 formed in the cover body 50 is larger than the total area of the through passages 41 in plan view. Here, the total area of the communication holes 55 refers to the total area of the plurality of communication holes 55 (in this embodiment, eight communication holes 55) when there are a plurality of communication holes 55. Further, as shown in FIG. 7, the through passage 41 is divided into four parts by the connecting portion 38 in a plan view. The total area of the through path 41 refers to the total area of the through path 41 divided into four parts in a plan view. Here, the total area of the communicating holes 55 is 1.1 times or more, preferably 1.3 times or more, and particularly preferably 1.5 times or more the total area of the through-holes 41 in plan view.

In this embodiment, the attachment part 35 has an insertion cylinder part 36. As shown in FIG. 3A, the shaft 53 of the cover body 50 is inserted into the insertion cylinder portion 36. The insertion tube portion 36 is recessed downward from the upper surface of the attachment portion 35 . Here, the insertion cylinder portion 36 has a shape corresponding to the shaft 53 of the cover body 50. The shaft 53 is fitted into the insertion cylinder portion 36. Note that in this embodiment, the cover body 50 is fixed to the lid body 30. Specifically, the cover body 50 is adhesively fixed to the attachment portion 35 of the lid body 30 via an adhesive. Therefore, in the state where the shaft 53 of the cover body 50 is inserted into the insertion cylinder part 36, the shaft 53 is configured not to rotate with respect to the insertion cylinder part 36. However, the cover body 50 does not need to be fixed (for example, adhesively fixed) to the lid body 30. The cover body 50 may be configured to rotate with respect to the lid body 30.

In this embodiment, the lid 10 includes an on-off valve 60. FIG. 9 is a diagram showing a state in which the on-off valve 60 closes the through passage 41 of the through cylinder portion 40. FIG. 10 is a diagram showing a state in which the on-off valve 60 opens the through passage 41 of the through cylinder portion 40. As shown in FIGS. 9 and 10, the on-off valve 60 opens and closes the lower end of the through-cylindrical portion 40. As shown in FIGS. Here, opening and closing the through-cylindrical portion 40 means opening and closing the through-path 41 formed in the through-cylindrical portion 40. As shown in FIG. 4 , by closing the through-cylindrical portion 40 with the on-off valve 60, it is possible to suppress the odor in the pipe line 1 from leaking to the outside through the through-path 41 of the through-cylindrical portion 40. Here, as shown in FIG. 3A, the on-off valve 60 is attached to the lid 30. Specifically, the on-off valve 60 is attached to the through-cylindrical portion 40. As shown in FIG. 10, the on-off valve 60 includes an arm 61, a support shaft 62, a valve body 63, and a weight 64.

The arm 61 is provided on the outer circumferential surface of the through-tube portion 40 . In this embodiment, as shown in FIG. 5, the number of arms 61 is two. The two arms 61 face each other across a straight line L1 passing through the center C1 of the through-tube portion 40 when viewed from the bottom. However, the number of arms 61 is not particularly limited, and may be one, for example.

The support shaft 62 is supported by the arm 61 and extends in a direction perpendicular to the axial direction of the through-tube portion 40 extending in the vertical direction D1. Here, the support shaft 62 spans two arms 61. As shown in FIG. 9, the valve body 63 can be attached to the lower end of the through-cylindrical portion 40. As shown in FIG. The valve body 63 is configured to open and close a lower opening in the through-cylindrical portion 40 . As shown in FIGS. 9 and 10, the valve body 63 is supported by a support shaft 62, and is swingably supported by the arm 61 via the support shaft 62. Note that the shape of the valve body 63 is not particularly limited. In this embodiment, as shown in FIG. 3A, the valve body 63 is flat and circular. The valve body 63 has a size large enough to cover the through-tube portion 40 from below. As shown in FIG. 9 , the valve body 63 is provided with a mounting portion 63 a that extends toward the opposite side of the through-tube portion 40 with respect to the support shaft 62 .

The weight 64 is disposed on the side opposite to the valve body 63 with respect to the support shaft 62 and is swingably supported by the arm 61 via the support shaft 62. In FIG. 9, the valve body 63 is arranged on the left side of the support shaft 62, and the weight 64 is arranged on the right side of the support shaft 62. Here, the weight 64 is removably attached to the attachment portion 63a of the valve body 63, and is fixed to the attachment portion 63a with a bolt 66 and a washer 67. In this embodiment, the valve body 63 and the weight 64 are separate bodies, but the valve body 63 and the weight 64 may be integrally molded.

In this embodiment, the weight of the weight 64 is greater than the weight of the valve body 63. Therefore, under normal conditions, if the difference between the pressure inside the pipe line 1 and the pressure outside the pipe line 1, in other words, the difference between the pressure below the valve body 63 and the pressure above the valve body 63, is small, An upward force acts on the valve body 63 around the support shaft 62 . Therefore, as shown in FIG. 9, the valve body 63 is in a state in which the through cylinder portion 40 (in other words, the through passage 41) is closed. On the other hand, when the pressure inside the conduit 1 becomes lower than the pressure outside the conduit 1 and the difference becomes large, a downward force acts on the valve body 63 around the support shaft 62. As a result, the valve body 63 rotates downward around the support shaft 62, so that the valve body 63 opens the through-cylindrical portion 40 (in other words, the through-path 41), as shown in FIG.

In this embodiment, as shown in FIG. 10, an elastic member 45 is provided at the lower end of the through-tube portion 40. As shown in FIG. 5, the elastic member 45 is formed in a ring shape. As shown in FIG. 9, the elastic member 45 can come into contact with the on-off valve 60. Here, when the valve body 63 of the on-off valve 60 closes the lower end of the through-tube portion 40, the valve body 63 contacts the elastic member 45. Therefore, when the valve body 63 closes the through-cylindrical portion 40, the elastic member 45 is interposed between the valve body 63 and the through-cylindrical portion 40. The elastic member 45 is attached to a portion of the through-tube portion 40 that can come into contact with the valve body 63. Here, the elastic member 45 is provided at the lower end of the through-cylindrical portion 40 so as to protrude downward from the lower end of the through-cylindrical portion 40 . When the valve body 63 closes the through passage 41 via the elastic member 45, the sealing performance between the through cylinder portion 40 and the on-off valve 60 can be improved.

Note that the type of elastic member 45 is not particularly limited. The elastic member 45 has a predetermined elastic force and is made of rubber, for example. As the rubber, synthetic rubber (eg, ethylene propylene rubber (EPDM)) can be suitably used.

As shown in FIGS. 3A and 4, the lid body 30 is vertically slidable with respect to the lid frame 20. As shown in FIG. 4, for example, the lid body 30 floats relative to the lid frame 20. By floating the lid 30 with respect to the lid frame 20, a gap S1 is formed between the lid 30 and the lid frame 20. Air within the pipe line 1 is discharged to the outside of the pipe line 1 through the gap S1 between the cover body 30 and the cover frame 20. Therefore, in the present embodiment, when the lid body 30 floats relative to the lid frame 20, the gap S1 formed between the lid body 30 and the lid frame 20 allows air in the pipe line 1 to flow through the pipe line 1. Functions as an exhaust function to discharge the air to the outside.

In this embodiment, as shown in FIG. 3A, the lid 10 includes a stopper 70. As shown in FIG. 4, the stopper 70 engages with the lid frame 20. Here, the stopper 70 engages with the lid frame 20 when the lid body 30 floats relative to the lid frame 20. The stopper 70 restricts further upward movement of the lid body 30 when the stopper 70 engages with the lid frame 20. In this embodiment, when the lid body 30 floats relative to the lid frame 20, the stopper 70 engages with the engaged portion 23 of the lid frame 20 from below. The stopper 70 extends downward from the back surface of the lid 30.

Here, the stopper 70 includes a rotation stopper 80 and a fixed stopper 90. Types of the stopper 70 include a rotating stopper 80 and a fixed stopper 90. The rotation stopper 80 rotates in the circumferential direction of the rotation stopper 80 with respect to the lid body 30. In this embodiment, as shown in FIG. 1, a mounting hole 32 is formed in the lid 30. As shown in FIG. 3A, the attachment hole 32 is a hole that penetrates the lid 30 in the vertical direction D1. As shown in FIG. 1, the attachment hole 32 has a circular shape. The size of the attachment hole 32 is not particularly limited. Here, as shown in FIG. 7, the attachment hole 32 is smaller than the through path 41 in plan view.

The rotation stopper 80 is fitted into the attachment hole 32 so as to be rotatable relative to the attachment hole 32 of the lid body 30 . The rotation stopper 80 is fitted into the attachment hole 32 and is rotatable relative to the attachment hole 32, for example, along arrow A1. Note that the configuration of the rotation stopper 80 is not particularly limited. In this embodiment, as shown in FIG. 3A, the rotation stopper 80 has a fitting part 85, a vertical part 81, and a horizontal part 82. The fitting portion 85 is a portion that is fitted into the attachment hole 32 and has a shape corresponding to the attachment hole 32. Here, as shown in FIG. 1, the fitting portion 85 has a circular shape in plan view.

As shown in FIG. 3A, the vertical portion 81 extends downward from the attachment hole 32. Here, the vertical portion 81 is connected to the fitting portion 85 and extends downward from the back surface of the fitting portion 85. In this embodiment, the vertical portion 81 is constituted by a plurality of rod-shaped portions 83. The number of rod-shaped portions 83 is three, but is not particularly limited. In this embodiment, the rod-shaped portion 83 includes a main rod-shaped portion 83a connected to the fitting portion 85, and two sub-rod portions 83b arranged on both sides of the main rod-shaped portion 83a. The lower end portions of the two sub rod-like portions 83b are connected to the lower end portion of the main rod-like portion 83a. The main rod-shaped portion 83a and the sub-rod-shaped portion 83b each extend in the vertical direction D1, and the distance between them becomes narrower toward the bottom.

The horizontal portion 82 extends radially outward from the vertical portion 81 and is capable of engaging with the lid frame 20 . The horizontal portion 82 is connected to the lower end of the vertical portion 81 and extends from the lower end of the vertical portion 81 in the horizontal direction. Specifically, the lateral portion 82 is connected to the lower end of the main rod-shaped portion 83a and to the lower ends of the two sub-rod-shaped portions 83b.

In this embodiment, the rotation stopper 80 rotates with respect to the attachment hole 32, thereby changing the position of the lateral portion 82 in the circumferential direction. Here, the rotation stopper 80 has a jig insertion portion 86 and a mark 87. The jig insertion portion 86 is a portion into which a jig is inserted. The jig insertion portion 86 is provided on the upper surface of the rotation stopper 80, and a surface into which a jig can be inserted from above the lid 10. Here, the jig insertion part 86 is provided on the upper surface of the fitting part 85 of the rotation stopper 80. Note that the configuration and shape of the jig insertion portion 86 are not particularly limited. In this embodiment, the jig insertion portion 86 is a groove recessed downward from the upper surface of the rotation stopper 80. The jig insertion portion 86 extends in a predetermined direction in plan view. Specifically, the jig insertion portion 86 is a groove extending in the same direction as the horizontal portion 82 in plan view.

The jig inserted into the jig insertion part 86 is used when removing the lid body 30 from the lid frame 20. Further, the jig is also used when rotating the rotation stopper 80 with respect to the mounting hole 32. Although the type of jig inserted into the jig insertion section 86 is not particularly limited, it has a shape corresponding to the jig insertion section 86. Here, the jig inserted into the jig insertion portion 86 is, for example, a flathead screwdriver.

The mark 87 is a mark that allows the operator to know the orientation of the horizontal portion 82 of the rotation stopper 80 disposed below the lid body 30 even when the operator views the lid 10 from above. Here, the mark 87 is formed on the upper surface of the rotation stopper 80, for example, on the upper surface of the fitting portion 85. Since the fitting part 85 rotates together with the lateral part 82, when the orientation of the lateral part 82 is changed, the orientation of the mark 87 is changed. Although the type of mark 87 is not particularly limited, it is an arrow here. The lateral portion 82 extends in the direction in which the arrow serving as the mark 87 faces. In this embodiment, a jig insertion portion 86 is provided within the mark 87.

In this embodiment, when removing the lid body 30 from the lid frame 20, a jig (for example, a flat head screwdriver) is inserted into the jig insertion portion 86. In this state, the operator can remove the lid 30 from the lid frame 20 by operating a jig and lifting the lid 30. Further, for example, when attaching the lid 30 to the lid frame 20, the rotation stopper 80 is rotated so that the horizontal portion 82 extends inward of the lid 30. At this time, for example, with the jig inserted into the jig insertion portion 86, the jig is rotated relative to the mounting hole 32. With this, the rotation stopper 80 can be rotated so that the horizontal portion 82 extends inward of the lid 30. This allows the lid body 30 to be attached to the lid frame 20 without the horizontal portion 82 of the rotation stopper 80 coming into contact with the engaged portion 23 of the lid frame 20.

Note that in this embodiment, the lid body 30 can be easily removed from the lid frame 20 by a method other than inserting a jig into the jig insertion portion 86. Here, as shown in FIG. 1, the lid 30 is provided with a recess 39. The recess 39 is provided at the periphery of the lid 30. The recess 39 is provided at the periphery of the lid 30 on the rotation stopper 80 side, and is recessed from the periphery of the lid 30 toward the inside of the lid 30. Specifically, the recess 39 is provided at the peripheral edge of the lid 30 that is closer to the rotation stopper 80 than the through cylinder 40 and on the opposite side of the rotation stopper 80 to the through cylinder 40. . In plan view, a rotation stopper 80 is arranged between the recess 39 and the through-tube 40. The recess 39 is provided in the lid 30 so as to be exposed from the upper surface of the lid 30.

Here, a removal jig is inserted into the recess 39. The removal jig inserted into the recess 39 is used when removing the lid 30 from the lid frame 20. The type of removal jig is not particularly limited, but may be, for example, a flathead screwdriver. The recess 39 has a shape corresponding to a portion of the removal jig to be inserted into the recess 39 in plan view. In this embodiment, the recess 39 is formed in a U-shape.

When removing the lid 30 from the lid frame 20 using the recess 39, the rotation stopper 80 is first rotated so that the horizontal portion 82 of the rotation stopper 80 extends inwardly of the lid 30. Thereafter, a removal jig is inserted into the recess 39 and the portion of the lid 30 around the recess 39 is lifted. At this time, due to the lever principle, the portion of the lid frame 20 that contacts the portion around the fixing stopper 90 of the lid 30 serves as a fulcrum, and the portion around the recess 39 serves as a point of effort, so that the lid 30 can be easily moved. Can be lifted. Note that when lifting the lid 30, the horizontal portion 82 of the rotation stopper 80 extends inside the lid 30, so it does not interfere with the lid frame 20, and the fixed stopper 90 also does not interfere with the lid frame 20. . Therefore, the lid body 30 can be easily removed from the lid frame 20.

Note that the recess 39 may be provided at the periphery of the lid 30 on the fixed stopper 90 side, but in that case, if the portion of the lid 30 around the recess 39 is lifted using the lever principle, the fixed stopper 90 will be lifted up. There is a risk that the claw portion 91, which will be described later, may interfere with the lid frame 20. Therefore, the recess 39 is preferably provided at the periphery of the lid 30 on the rotation stopper 80 side.

Here, as shown in FIG. 3A, in a state where the lateral portion 82 extends toward the outside of the lid body 30, the tip of the lateral portion 82 is located at the radially inner end of the engaged portion 23 of the lid frame 20. It is located radially outward. Therefore, as shown in FIG. 4, when the lid body 30 floats relative to the lid frame 20, the horizontal portion 82 of the rotation stopper 80 engages with the engaged portion 23 of the lid frame 20 from below, Further upward movement of the lid 30 is restricted.

The fixed stopper 90 is different from the rotating stopper 80 and does not rotate relative to the lid 30. The fixed stopper 90 extends downward from the back surface of the lid 30. Note that the configuration of the fixed stopper 90 is not particularly limited. In this embodiment, the fixed stopper 90 has a fixed rod-shaped portion 93 and a claw portion 91. The fixed rod-shaped portion 93 is a rod-shaped member extending downward from the back surface of the lid body 30. As shown in FIG. 4, the claw portion 91 engages with the lid frame 20. As shown in FIG. Here, when the lid body 30 floats with respect to the lid frame 20, the claw portion 91 engages with the engaged portion 23 of the lid frame 20 from below. The claw portion 91 projects from the fixed rod-shaped portion 93 toward the outside of the lid body 30. Here, the claw portion 91 is connected to the lower end portion of the fixed rod-shaped portion 93. Note that the position of the claw portion 91 in the vertical direction D1 is the same as the position of the horizontal portion 82 of the rotation stopper 80 in the vertical direction D1. The fixed stopper 90 may be formed integrally with the lid 30 or may be separate from the lid 30.

In the present embodiment, when the lid body 30 is attached to the lid frame 20, the tip of the claw portion 91 (here, the radial outer end) is closer to the radial inner end of the engaged portion 23 of the lid frame 20. is also located on the outside in the radial direction. Therefore, as shown in FIG. 4, when the lid body 30 floats relative to the lid frame 20, the claw portion 91 of the fixed stopper 90 engages the engaged portion 23 from below, and the further lid body 30 The upward movement of is regulated.

As shown in FIG. 5, the rotation stopper 80 and the fixed stopper 90 are arranged at positions facing each other across the through-cylindrical portion 40 (in other words, the through-path 41) in plan view. Here, the rotation stopper 80 is arranged closer to the attachment hole 32 than the through passage 41 . The fixed stopper 90 is disposed on the opposite side of the through-hole 41 from the attachment hole 32 . The number of rotation stoppers 80 and fixed stoppers 90 is not particularly limited. The number of rotation stoppers 80 is one, but may be plural. Here, the number of fixed stoppers 90 is two, but it may be one, or three or more. The two fixed stoppers 90 are arranged on the opposite side of the through-hole 41 from the attachment hole 32 .

Here, the lid 10 is mainly formed of a resin material or a cast iron material. Specifically, the members of the lid 10 excluding the sealing member 31 and the elastic member 45 (for example, the lid frame 20, the lid body 30, the side wall portion 33, the mounting portion 35, the through cylinder portion 40, the cover body 50, the stopper 70, etc.) are as follows: Although it is made of resin material, it may also be made of cast iron material. As the resin material, for example, hard vinyl chloride resin can be suitably used.

The configuration of the lid 10 according to this embodiment has been described above. Next, how to use the lid 10 will be explained. First, in the lid 10, when attaching the lid body 30 to the lid frame 20, the rotation stopper 80 is rotated relative to the mounting hole 32 so that the tip of the horizontal portion 82 of the rotation stopper 80 faces inward of the lid body 30. make it move. At this time, the rotation stopper 80 can be rotated by rotating the jig relative to the mounting hole 32 with the jig inserted into the jig insertion portion 86, for example. Note that as the rotation stopper 80 rotates, the direction of the mark 87 changes, so by knowing the direction of the mark 87, the direction of the horizontal portion 82 of the rotation stopper 80 can be known. Thereafter, as shown in FIG. 3A, the lid 30 is moved so that the horizontal portion 82 of the rotation stopper 80 and the claw portion 91 of the fixed stopper 90 are arranged below the engaged portion 23 of the lid frame 20. is attached to the lid frame 20. After the lid 30 is attached to the lid frame 20, the rotation stopper 80 is rotated relative to the attachment hole 32 so that the tip of the horizontal portion 82 of the rotation stopper 80 faces outside of the lid 30. Also at this time, the rotation stopper 80 can be rotated by rotating the jig relative to the mounting hole 32 with the jig inserted into the jig insertion portion 86.

When the lid body 30 is attached to the lid frame 20, the through passage 41 of the through cylinder portion 40 is closed by the on-off valve 60, as shown in FIG. For example, when a large amount of wastewater in the full pipe line 1 is discharged into the sewer main pipe, the inside of the pipe line 1 may become under negative pressure. At this time, the pressure inside the conduit 1 becomes lower than the pressure outside the conduit 1. When the pressure difference between the inside and outside of the pipe line 1 at this time becomes higher than a predetermined first reference pressure, a downward force is applied to the valve body 63 of the on-off valve 60 in the lid 10 around the support shaft 62. As a result, as shown in FIG. 10, the valve body 63 rotates downward around the support shaft 62, so that the valve body 63 opens the through passage 41. As a result, as shown in FIG. 3A, air outside the conduit 1 is introduced into the through passage 41 through the communication hole 55 of the cover body 50 and the space S10 between the cover body 50 and the side wall portion 33. Ru. The air introduced into the through passage 41 enters into the pipe line 1, and the pressure within the pipe line 1 increases, making it difficult for the pressure to become negative.

As shown in FIG. 4, in a state where the through passage 41 of the through cylinder part 40 is closed by the on-off valve 60, the middle space S12 and the upper part of the space S10 between the cover body 50 and the side wall part 33 are closed. A closed space is formed by the space S13 and the through passage 41. Since this closed space is closed by the on-off valve 60, for example, pressure is generated in a direction (downward here) pushing toward the lower space S11.

Here, during rain, rainwater collects on the lid 30. The rainwater accumulated on the lid body 30 enters the lower space S11 between the cover body 50 and the side wall portion 33 through the communication hole 55 of the cover body 50. Thereafter, when the amount of rainwater accumulated on the lid body 30 increases, the water level rises in the lower space S11 and reaches the height of the boundary between the lower space S11 and the middle space S12, that is, the height of the upper end of the communication hole 55. At this time, since the rainwater is pushed by the pressure generated in the closed space, the rainwater that has risen to the upper end of the communication hole 55 becomes difficult to rise into the middle space S12. This makes it difficult for rainwater to enter the pipe line 1 through the middle space S12, the upper space S13, and the through passage 41.

In this embodiment, when the amount of waste water flowing through the pipe line 1 increases, the pressure inside the pipe line 1 increases. At this time, the pressure inside the pipe line 1 becomes higher than the pressure outside the pipe line 1. When the pressure difference between the inside and outside of the pipe line 1 at this time becomes higher than the predetermined second reference pressure, the lid body 30 floats relative to the lid frame 20, as shown in FIG. When the lid body 30 floats up, the horizontal portion 82 of the rotation stopper 80 and the claw portion 91 of the fixed stopper 90 engage with the engaged portion 23 of the lid frame 20 from below. In this manner, the horizontal portion 82 of the rotation stopper 80 and the claw portion 91 of the fixed stopper 90 engage with the engaged portion 23, thereby restricting further upward movement of the lid 30. Note that when the lid body 30 floats relative to the lid frame 20, the through passage 41 of the through cylinder portion 40 is in a state where it is closed by the on-off valve 60.

By floating the lid 30 with respect to the lid frame 20, a gap S1 is formed between the lid frame 20 and the lid 30. As a result, air within the pipe line 1 flows to the outside of the pipe line 1 through the gap S1 between the lid frame 20 and the lid body 30. As a result, the pressure within the conduit 1 becomes low. Note that when the pressure inside the pipe line 1 becomes low and the pressure difference between the inside and outside of the pipe line 1 becomes equal to or less than the above-mentioned second reference pressure, the cover body 30 moves downward with respect to the cover frame 20, as shown in FIG. 3A. The lid body 30 is moved and attached to the lid frame 20.

As described above, in this embodiment, as shown in FIG. 3A, the lid 10 includes the lid frame 20, the lid body 30, the through cylinder part 40, the on-off valve 60, the side wall part 33, and the cover body 50. We are prepared. The lid frame 20 is provided on the conduit 1. The lid body 30 is detachably attached to the lid frame 20. The through cylinder portion 40 is provided in the lid body 30. A through passage 41 that is open upward and downward of the lid body 30 is formed in the through cylinder portion 40 . As shown in FIG. 4, the on-off valve 60 can open and close the lower end of the through passage 41. As shown in FIG. The side wall portion 33 is arranged so as to surround the through passage 41 in a plan view, and protrudes upward from the lid body 30. The cover body 50 is attached to the lid body 30 so as to cover the through path 41 and the side wall portion 33 from above. A communication hole 55 communicating with the through path 41 is formed in the cover body 50 . As shown in FIG. 3B, the communication hole 55 is arranged below the upper end of the side wall portion 33. As shown in FIG.

In this embodiment, a hollow space S12 is formed between the cover body 50 and the side wall portion 33 in a region in the vertical direction D1 from the upper end of the communication hole 55 of the cover body 50 to the upper end of the side wall portion 33. When it rains, rainwater collects on the lid 30 and the water level rises. Here, the water level rises to the upper end of the communication hole 55 of the cover body 50. For example, when the opening/closing valve 60 at the lower end of the through passage 41 is closed, the through passage 41 and A closed space is formed. Therefore, the rainwater that has risen to the position of the upper end of the communication hole 55 of the cover body 50 becomes more difficult to rise than the position of the upper end of the communication hole 55 due to the pressure formed in the closed space. Therefore, it is possible to make it difficult for rainwater to enter the pipe line 1 through the through passage 41.

In the present embodiment, in the space S10 between the cover body 50 and the side wall part 33, the space from the upper end of the communication hole 55 to the upper end of the side wall part 33 is defined as an intermediate space S12, and the space above from the upper end of the side wall part 33 is defined as an intermediate space S12. is the upper space S13. As shown in FIG. 3B, a distance L32 of the middle space S12 in the vertical direction D1 is shorter than a distance L33 of the upper space S13 in the vertical direction D1. Here, the upper space S13 directly communicates with the through passage 41. Therefore, by enlarging the upper space S13, more air can be taken into the through passage 41 through the upper space S13 at one time. Therefore, it is possible to make it easier to take in air.

In this embodiment, of the space S10 between the cover body 50 and the side wall portion 33, the space from the lower end of the cover body 50 to the upper end of the communication hole 55 is defined as a lower space S11. A distance L32 of the middle space S12 in the vertical direction D1 is shorter than a distance L31 of the lower space S11 in the vertical direction D1. Here, the lower space S11 directly communicates with the communication hole 55. Therefore, by enlarging the lower space S11, more air can be taken into the lower space S11 from the communication hole 55 at one time. Therefore, it is possible to make it easier to take in air.

In this embodiment, as shown in FIG. 3B, the length L21 of the side wall portion 33 in the vertical direction D1 is 1.1 times or more the distance L22 in the vertical direction D1 from the lower end of the cover body 50 to the upper end of the communication hole 55. It is. In this way, by making the length L21 of the side wall portion 33 in the vertical direction D1 1.1 times or more the distance L22 in the vertical direction D1 from the lower end of the cover body 50 to the upper end of the communication hole 55, the cover body 50 The size of the hollow space S12 in the area in the vertical direction D1 from the upper end of the communication hole 55 of the cover body 50 to the upper end of the side wall part 33 can be ensured between and the side wall part 33. Therefore, a closed space formed by the hollow space S12 in the area in the vertical direction D1 from the upper end of the communication hole 55 to the upper end of the side wall portion 33, the through passage 41, etc. can be secured. Therefore, the rainwater that has risen to the position of the upper end of the communication hole 55 of the cover body 50 becomes more difficult to rise than the position of the upper end of the communication hole 55 due to the pressure formed in the closed space. Therefore, it is possible to make it difficult for rainwater to enter the pipe line 1 through the through passage 41.

In this embodiment, the communication hole 55 opens laterally. As a result, even if a person or a car rides on the cover body 50, for example, the communication hole 55 opens toward the side, making it difficult for the communication hole 55 to be blocked. Can be done.

In this embodiment, as shown in FIG. 2, in the communication hole 55, the length L12 in the circumferential direction is longer than the length L11 in the vertical direction D1. In this way, by increasing the circumferential length L12 of the communication hole 55, more air can be taken into the pipe line 1 from the through passage 41 through the communication hole 55. Therefore, it is possible to make it easier to take in air. Moreover, by shortening the length of the communication hole 55 in the vertical direction D1, the length of the cover body 50 in the vertical direction D1 can be shortened. Therefore, the length of the cover 50 that protrudes upward from the lid 30 can be shortened, making it difficult for people, cars, etc. to trip over the lid 10.

In this embodiment, as shown in FIG. 3A, the cover body 50 has a covering part 51 that covers the through passage 41 and is arranged at a position overlapping with the through passage 41 in a plan view and is spaced apart from the side wall part 33. are doing. Here, a hole like the communication hole 55 is not formed in the covering portion 51 of the cover body 50. Therefore, rainwater falling on the covering portion 51 can be made difficult to enter into the through passage 41.

In addition, in the said embodiment, the number of communication holes 55 in the cover body 50 was eight, as shown in FIG. However, as shown in FIG. 11, the number of communication holes 55A formed in the cover body 50A may be four. Even in this case, the four communication holes 55A are formed in the side portion 52 so as to be lined up along the circumferential direction of the cover body 50A. The intervals between adjacent communication holes 55A are the same, but may be different.

Furthermore, although the four communication holes 55A have the same size, some of the communication holes 55A may have different sizes from the other communication holes 55A. In one communication hole 55A, the length L12A in the circumferential direction is longer than the length L11A in the vertical direction D1. The communication hole 55A here has a size similar to that obtained by cutting out the side portions 52 of two adjacent communication holes 55 (see FIG. 8) in the above embodiment. In this embodiment, in one communication hole 55A, the length L12A in the circumferential direction is at least twice the length L11A in the vertical direction D1, preferably at least 3 times, and more preferably at least 5 times.

In the above embodiment, as shown in FIG. 3A, the inner circumferential surface of the side wall portion 33 and the inner circumferential surface of the through-tube portion 40 are continuous. That is, the inner circumferential surface of the side wall portion 33 and the inner circumferential surface of the through-tube portion 40 were flush with each other. However, for example, the upper end of the through-tube 40 protrudes upward from the lid 30, and the cylindrical side wall 33 extends around the upper end of the through-tube 40 (i.e., outside the upper end of the through-tube 40). It may be placed in The side wall portion 33 may be provided on the lid body 30 so as to cover the upper end portion of the through-tube portion 40 from the outside. Above the lid body 30, the side wall portion 33 and the upper end portion of the through cylinder portion 40 may have a double structure.

In the above embodiment, the pipe 1 provided with the lid 10 is a pipe through which waste water (particularly sewage) flows, and the lid 10 is a lid for sewage. However, the pipe 1 may be a pipe through which rainwater flows. The lid 10 may be a rainwater lid.

In the embodiment described above, the through passage 41 formed in the through cylinder portion 40 of the lid body 30 was for sucking air from outside the conduit 1 into the conduit 1. However, the through passage 41 may be for passage of odor (for example, odor within the pipe 1).

1 Pipe line 10 Lid 20 Lid frame 30 Lid body 33 Side wall part 40 Penetration cylinder part 41 Penetration passage 50 Cover body 51 Coating part 55 Communication hole 60 On-off valve S10 Space S11 Lower space S12 Middle space S13 Upper space

Claims (7)

A lid frame provided on the conduit,
a lid body that is removably attached to the lid frame;
a through-cylindrical portion provided in the lid and having a through passage opened upward and downward of the lid;
an on-off valve that can open and close the lower end of the through passage;
a side wall portion that is arranged to surround the through path in plan view and protrudes upward from the lid body;
a cover body attached to the lid body so as to cover the through path and the side wall portion from above;
Equipped with
A communication hole communicating with the through path is formed in the cover body,
The communication hole is arranged below an upper end of the side wall portion. The lid according to claim 1, wherein the communication hole opens laterally. The lid according to claim 1, wherein the communication hole has a circumferential length longer than a vertical length. Among the spaces between the cover body and the side wall part, when the space from the upper end of the communication hole to the upper end of the side wall part is defined as a middle space, and the space above the upper end of the side wall part is defined as an upper space,
The lid according to claim 1, wherein the distance in the vertical direction of the middle space is shorter than the distance in the vertical direction of the upper space. Of the space between the cover body and the side wall part, the space from the lower end of the cover body to the upper end of the communication hole is defined as a lower space, and the space from the upper end of the communication hole to the upper end of the side wall part is defined as a middle space. When it is a space,
The lid according to claim 1, wherein the vertical distance of the middle space is shorter than the vertical distance of the lower space. The lid according to claim 1, wherein the length of the side wall portion in the vertical direction is 1.1 times or more the distance in the vertical direction from the lower end of the cover body to the upper end of the communication hole. According to any one of claims 1 to 6, the cover body has a covering part that is arranged at a position overlapping with the through-path in a plan view and covers the through-path so as to be spaced apart from the side wall part. Lid as described.

Images