Drain port lid and drainpipe ventilation system

Abstract

To provide a drain port lid allowing inner pressure and backflow water in a drainpipe to be stably discharged, and also to provide a drainpipe ventilation system.SOLUTION: In a drainpipe ventilation system 1, an upper opening lid 3 for closing an upper opening 11 of a drain frame body 2 has an external ventiduct 16 that communicates an inner space 13 and an outer space of the drain frame body 2, and a drain port lid 5 for closing a drain port communicating with a drainpipe has an inner ventiduct 21 that communicates the inside of the drainpipe and the inner space 13, a closing valve 22 for closing the inner ventiduct 21, and an operation part 25 operated by an operator. Such a configuration allows inner pressure and backflow water to be discharged through the inner ventiduct 21 and the outer ventiduct 16 by increase in the inner pressure of the drainpipe and occurrence of the backflow water. Works to remove and attach the drain port lid 5 can be easily executed using the operation part 25 during inspection work.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a drain outlet cover that is attached to a drain outlet that communicates with a drain pipe to close the drain outlet, and to a drain pipe ventilation system that has the drain outlet cover. [Background technology]

[0002] A drain pipe, such as a sewer pipe, is known to be connected to a space in a protective housing buried underground and open to the ground through an upper opening of the protective housing. For example, Patent Document 1 proposes a configuration including an outer lid (protective housing lid) that closes the upper opening and an inner lid (cleaning port lid) that closes a drain outlet (cleaning port) that opens into the space in the protective housing and communicates with the drain pipe. In this conventional configuration, a closed communication hole is formed in the inner lid, and the communication hole can be opened by cutting the communication hole. When the communication hole is opened, if internal pressure in the drain pipe increases or backflow occurs due to heavy rain or other reasons, the internal pressure and backflow can be released through the communication hole, thereby preventing damage to the drain pipe and malfunctions in upstream drainage equipment. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication number 6-9076 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional configuration of Patent Document 1, the internal pressure of the drain pipe and backflow water cannot be released to the outside unless the communication hole is cut and opened. Therefore, before a heavy rainfall occurs, a worker must enter the space of the protective housing and cut the communication hole. However, in recent years, there has been an increase in cases where localized heavy rainfall occurs in a short period of time, making it difficult to predict the occurrence of a heavy rainfall and open the communication hole immediately before the heavy rainfall. Furthermore, if the communication hole is not opened, the internal pressure of the drain pipe and backflow water cannot be released to the outside, which could result in damage to the drain pipe.

[0005] The present invention proposes a drain cover and drain pipe ventilation equipment that can stably release the internal pressure and backflow water of a drain pipe. [Means for solving the problem]

[0006] The first aspect of the present invention is a drainage frame having an upper opening that opens upward and an internal space that communicates with the inside of a drainage pipe via a drainage outlet provided below the upper opening, and an upper opening lid that is attached to the upper opening and closes the upper opening, the upper opening lid being used in a drainage pipe ventilation system that has an external air passage that connects the external air space above the upper opening lid with the internal space, and is attached to the drainage outlet of the drainage pipe ventilation system to close the drainage outlet, and is equipped with an internal air passage that connects the inside of the drainage pipe with the internal space, a closing valve unit that closes the internal air passage, and an operating unit that is operated by an operator to attach and remove the drainage outlet.

[0007] With this configuration, the internal pressure and backflow water of the drain pipe can be released into the internal space through the internal ventilation passage, and further, this internal pressure and backflow water can be released into the external air space through the external ventilation passage of the upper open lid, so that it is possible to stably and reliably prevent the internal pressure and backflow water caused by heavy rain from damaging the drain pipe or adversely affecting upstream drainage equipment.

[0008] Furthermore, since the configuration of the present invention includes an operating unit, a worker can easily remove or attach the drain outlet cover from the drain outlet from the ground by using the operating unit during inspection work, maintenance work, etc., thereby improving the workability of these work. Here, the operating unit may be configured to be either directly operable by the worker's own hand, or indirectly operable by the worker using a jig or the like, or may be configured to allow both direct and indirect operation.

[0009] In the drain lid of the present invention described above, the closing valve portion is configured to be convertible between a closed state in which the internal air passage is closed and an open state in which it is raised from the closed state to open the internal air passage, and is equipped with an internal pressure release means that converts the closing valve portion from the closed state to the open state using the internal pressure of the drain pipe when the internal pressure of the drain pipe reaches a predetermined pressure or higher, and a configuration is proposed in which the operating portion is configured so as not to interfere with the conversion operation of the closing valve portion that converts the closing valve portion between the closed state and the open state.

[0010] In this configuration, when the internal pressure of the drain pipe (including the internal pressure caused by backflow water and the water pressure caused by backflow water) exceeds a predetermined pressure, the internal air passage opens, allowing the internal pressure and backflow water to be released through the internal air passage. Here, because the operating unit does not interfere with the closing valve unit's switching operation, the closing valve unit can be smoothly and stably switched to the open state. Therefore, this configuration can more stably prevent damage to the drain pipe due to internal pressure and adverse effects of backflow water on upstream drainage equipment.

[0011] In this configuration, the operating part may be arranged on an extension of a virtual operating line that converts the shut-off valve part between the closed state and the open state. In this configuration, in addition to the above-mentioned effect that the operating part does not interfere with the operation of converting the shut-off valve part to the open state, there is an excellent advantage that, if the shut-off valve part jumps out beyond the open state and becomes detached due to, for example, a sudden increase in pressure, the shut-off valve part can be brought into contact with the operating part, thereby preventing damage, etc., caused by the shut-off valve part jumping out.

[0012] In the drain lid of the present invention described above, the closing valve portion is configured to be convertible between a closed state in which the internal air passage is closed and an open state in which it is raised from the closed state to open the internal air passage, and is equipped with an internal pressure release means that converts the closing valve portion from the closed state to the open state using the internal pressure of the drain pipe when the internal pressure of the drain pipe reaches a predetermined pressure or higher, and the operating portion is arranged above the closing valve portion and is configured to abut against the closing valve portion when the closing valve portion converts from the closed state to the open state.

[0013] In this configuration, when the internal pressure of the drain pipe (including the internal pressure due to backflow water and the water pressure due to backflow water) exceeds a predetermined pressure, the internal air passage opens, allowing the internal pressure and backflow water to be released through the internal air passage. Here, because the closing valve portion converted to the open state abuts the operating portion, the pressure acting on the closing valve portion (internal pressure of the drain pipe) when converted to the open state can also be supported by the operating portion. This prevents the closing valve portion from being damaged by the pressure acting on it. Therefore, this configuration more reliably prevents damage to the drain pipe due to an increase in the internal pressure of the drain pipe and the adverse effects of backflow water on upstream drainage equipment.

[0014] In the drain outlet cover of the present invention described above, a configuration is proposed in which the operating part is configured to be able to be converted between a storage position that cannot be operated by an operator and an operating position that is located above the storage position and can be operated by the operator.

[0015] In this configuration, the operating unit can be converted to the operating position when an operator operates it, and can be kept in the storage position when not in operation, which has the advantage that the operating unit does not get in the way of inspection or maintenance work when not in operation.

[0016] In the drain outlet cover of the present invention described above, a configuration is proposed in which the operating portion is provided detachably.

[0017] In this configuration, the operating unit can be removed when not in use, which has the advantage that, for example, when performing inspection or maintenance work without operating the operating unit, the operating unit can be removed so as not to interfere with these operations.

[0018] On the other hand, the second aspect of the present invention is a drain pipe ventilation equipment comprising a drain frame body having an upper opening that opens upward and an internal space that communicates with the inside of a drain pipe via a drain outlet section provided below the upper opening, an upper opening lid that is attached to the upper opening and closes the upper opening, and a drain outlet lid that is attached to the drain outlet section and closes the drain outlet section, wherein the upper opening lid has an external ventilation path that connects the external air space above the upper opening lid with the internal space of the drain frame body, and the drain outlet lid has an internal ventilation path that connects the inside of the drain pipe with the internal space, a closing valve section that closes the internal ventilation path, and an operating section that is operated by an operator for attaching and removing it from the drain outlet section.

[0019] With this configuration, the internal pressure and backflow water of the drain pipe can be released into the internal space through the internal ventilation passage of the drain outlet cover, and further, this internal pressure and backflow water can be released into the external air space through the external ventilation passage of the upper open lid, so it is possible to stably and reliably prevent the internal pressure and backflow water caused by heavy rain from damaging the drain pipe or adversely affecting upstream drainage equipment.

[0020] In addition, since the drain outlet cover is provided with an operating unit in this configuration, workers can easily remove and attach the drain outlet cover from the ground during inspection work, maintenance work, etc., thereby improving the workability of these work. Note that the operating unit can have the same configuration as the drain outlet cover operating unit described above. [Effects of the Invention]

[0021] The drain outlet cover of the present invention can release the internal pressure of the drain pipe and backflow water, thereby preventing damage to the drain pipe and adverse effects on upstream drainage equipment, etc. Furthermore, since the operator can easily remove and attach the cover from the drain outlet using the operating unit, the workability of inspection and maintenance work can be improved.

[0022] The drain pipe ventilation equipment of the present invention is configured to include the drain outlet cover of the present invention described above, and therefore can achieve the same operational effects. [Brief explanation of the drawings]

[0023] [Figure 1] 1A is a cross-sectional view showing the installed state of a drain pipe ventilation system 1 of a first embodiment according to the present invention, and FIG. 1B is a perspective view showing the state in which a drain outlet cover 5 is attached to a drain outlet portion 102. [Figure 2] 2 is a cross-sectional view showing the upper opening cover 3, the drain frame 2, and the drain outlet cover 5 separated from each other. [Figure 3] 1 is an explanatory diagram showing a pressure release mode in the drain pipe ventilation equipment 1. FIG. [Figure 4] 1A and 1B are cross-sectional views showing the drain pipe ventilation system 1 of Example 2 in an installed state and a pressure-released state, respectively. [Figure 5] 10A and 10B are cross-sectional views showing the drain pipe ventilation equipment of Example 3 with the operating unit 35 attached to the drain outlet cover 5 and with the operating unit 35 removed, respectively. [Figure 6] FIG. 10(A) is a cross-sectional view showing the installed state of the drain pipe ventilation equipment 1 of Example 4, and FIG. 10(B) is a perspective view showing the drain outlet cover 5. [Figure 7] 10A and 10B are cross-sectional views of the drain pipe ventilation equipment 1 of the fifth embodiment, showing a state in which the operating unit 45 is in the stored position and a state in which the operating unit 45 is in the operating position. [Figure 8] 10A and 10B are perspective views of the drain outlet cover 5 of the drain pipe ventilation equipment 1 of the fifth embodiment, showing a state in which the operating part 45 is in the stored position and a state in which the operating part 45 is in the operating position. [Figure 9]10A is a cross-sectional view showing the installed state of the drain pipe ventilation equipment 1 of Example 6, and FIG. 10B is a perspective view showing the drain outlet cover 5. DETAILED DESCRIPTION OF THE INVENTION

[0024] Examples 1 to 6 embodying the drain pipe ventilation system 1 and the drain outlet cover 5 according to the present invention will be described in detail below. [Example]

[0025] The drain pipe ventilation equipment 1 of the first embodiment is for releasing the internal pressure (including water pressure) that has increased in a drain pipe buried underground and backflow water generated in the drain pipe into the external airspace (atmosphere) through a vertical pipe 101 that is connected to the drain pipe, and is arranged to cover the upper end (outlet 102) of the vertical pipe 101, as shown in FIG. 1(A). The drain pipe (not shown) and the vertical pipe 101 are buried underground, and a paved area S is constructed around the drain pipe ventilation equipment 1 using asphalt, concrete, or the like that is paved on the ground G. Here, the outlet 102 that opens at the upper end of the vertical pipe 101 is exposed to the ground G through an opening (not shown) in a base M that is provided on the ground G.

[0026] The drain pipe ventilation equipment 1 comprises an approximately cylindrical drain frame body 2 installed on the base M, an upper opening lid 3 that closes the upper opening 11 of the drain frame body 2, a lid receiving frame 4 attached to the drain outlet portion 102 of the vertical pipe 101, and a drain outlet lid 5 that is attached to the lid receiving frame 4 and closes the drain outlet portion 102.

[0027] As shown in Figures 1(A) and 2, the drainage frame 2 is generally cylindrical and opens in the vertical direction, and has at its upper part the upper opening 11 that is closed by the upper opening lid 3, and at its lower part a circular mounting portion 12 that is mounted on the base M. The drainage frame 2 has an inner space 13 that communicates with the drain outlet 102 of the vertical pipe 101, and the inner space 13 opens upward through the upper opening 11. That is, when the drain outlet lid 5 and the upper opening lid 3 are not attached, the drain outlet 102 of the vertical pipe 101 opens upward through the inner space 13 and the upper opening 11 of the drainage frame 2. On the other hand, when the upper opening 11 and the drain outlet 102 are closed, the inner space 13 of the drainage frame 2 is closed from the inside of the vertical pipe 101 (the inside of the drain pipe) and the outside.

[0028] The top opening lid 3 is equipped with an external vent passage 16 that penetrates vertically, and a pressure release valve portion 17 that closes the external vent passage 16, and the pressure release valve portion 17 is provided so as to be movable up and down relative to the external vent passage 16. The pressure release valve portion 17 is equipped with a main valve portion 17a and a pressure receiving shaft portion 17b that protrudes downward from the main valve portion 17a, and the pressure receiving shaft portion 17b is formed with a smaller diameter than the external vent passage 16 and is inserted into the external vent passage 16 to protrude downward. A valve receiving portion 18 to which the main valve portion 17a of the pressure release valve portion 17 is attached is provided on the upper surface of the top opening lid 3, and when the main valve portion 17a of the pressure release valve portion 17 is attached to the valve receiving portion 18 (hereinafter referred to as the closed state), the external vent passage 16 is closed by the main valve portion 17a. Furthermore, when the main valve portion 17a of the pressure release valve portion 17 moves upward from the closed state in which it is attached to the valve receiving portion 18, the external vent passage 16 is opened (see FIG. 3(B)). When the pressure release valve portion 17 moves upward to open the external vent passage 16 (hereinafter referred to as the open state), the internal space 13 of the drainage frame 2 communicates with the external space. The pressure release valve portion 17 is maintained in the closed state in which it is attached to the valve receiving portion 18 of the upper opening lid 3 by its own weight, and is raised from the closed state to the open state when it is lifted upward. Then, when this lifting force is released, it moves down from the open state to the closed state.

[0029] Furthermore, a peripheral wall 19 is provided on the back surface of the upper opening lid 3 so as to surround the pressure-receiving shaft 17b of the pressure release valve 17 protruding from the external ventilation path 16. This peripheral wall 19 can protect the pressure-receiving shaft 17b of the pressure release valve 17 from external impacts, and can also efficiently transmit pressure transmitted from the vertical pipe 101 to the pressure-receiving shaft 17b, as will be described later.

[0030] In this embodiment, the external vent passage 16 (pressure release valve portion 17) is located at a position offset (horizontally displaced) from the center of the upper opening lid 3. This is to prevent interference with a locking member (not shown) provided on the upper opening lid 3. This locking member is used to lock the upper opening lid 3 to the upper opening 11 of the drainage frame 2. If the shape of the locking member and the size of the upper opening lid do not cause interference with the locking member, it is preferable to locate the pressure opening (pressure release valve portion) in the center of the upper opening lid (directly above the internal vent passage). This is because the pressure in the opened drain pipe can be efficiently transmitted to the pressure release lid via the internal vent passage 21.

[0031] 1 and 2, the lid receiving frame 4 has a substantially circular ring shape and is fitted into the drain outlet portion 102 of the vertical pipe 101. When the lid receiving frame 4 is fitted into the drain outlet portion 102, the drain outlet portion 102 is open upward, and when the drain outlet lid 5 is attached to the lid receiving frame 4, the drain outlet portion 102 is closed.

[0032] The drain cover 5 includes an internal air vent passage 21 that penetrates vertically, and a closing valve portion 22 that closes the internal air vent passage 21, and the closing valve portion 22 is provided so as to be movable up and down relative to the internal air vent passage 21. The closing valve portion 22 includes a main valve portion 22a and a pressure-receiving shaft portion 22b that protrudes downward from the main valve portion 22a. The pressure-receiving shaft portion 22b includes a cylindrical shaft portion (not shown) that is inserted into the internal air vent passage 21, and a disk-shaped pressure-receiving portion (not shown) that is provided at the lower end of the shaft portion, and the shaft portion is formed with a smaller diameter than the internal air vent passage 21, and the pressure-receiving portion is formed with a larger diameter than the internal air vent passage 21 and is located below the internal air vent passage 21.

[0033] The upper surface of the drain lid 5 is provided with a valve receiving portion 23 to which the main valve portion 22a of the stop valve portion 22 is attached. When the main valve portion 22a is attached to the valve receiving portion 23 (hereinafter referred to as the closed state), the main valve portion 22a closes the internal air passage 21. When the stop valve portion 22 is raised from the closed state attached to the valve receiving portion 23, the internal air passage 21 is opened (see FIG. 3). When the stop valve portion 22 is raised and the internal air passage 21 is opened (hereinafter referred to as the open state), the interior of the vertical pipe 101 and the internal space 13 of the drain frame 2 are connected. The stop valve portion 22 is maintained in the closed state attached to the valve receiving portion 23 of the drain lid 5 by its own weight, and is raised from the closed state to the open state by being lifted upward. When this lifting force is released, the stop valve portion 22 descends from the open state to the closed state. Here, the shut-off valve section 22 can be raised to a position where the pressure-receiving portion of the pressure-receiving shaft section 22b abuts against the underside of the drain outlet cover 5, which is the maximum raised position. In this way, the shut-off valve section 22 can be raised and lowered between the closed state and the maximum raised position along the vertical imaginary operating line L that extends from the closed state to the maximum raised position.

[0034] As shown in Figures 1 and 2, the drain outlet cover 5 is provided with an operating unit 25 that can be operated by an operator. The operating unit 25 in this embodiment 1 is composed of a gripping rod 25a that is gripped by the operator and support rods 25b, 25b bent downward from both ends of the gripping rod 25a, and the lower ends of the support rods 25b, 25b are embedded and fixed in the drain outlet cover 5. Here, in the operating unit 25 in this embodiment 1, the gripping rod 25a is disposed directly above the stop valve portion 22, and the lower ends of the support rods 25b, 25b are disposed so as to face each other across the stop valve portion 22, and are arranged so as to straddle the stop valve portion 22. The lengths (vertical lengths) of the support rods 25b, 25b are set so that the gripping rod 25a is positioned above the stop valve portion 22 when it has been raised to the maximum raised position. This prevents interference between the stop valve portion 22 and the operating portion 25 when the stop valve portion 22 moves up and down between the closed state and the maximum raised position. The length of the support rod portions 25b, 25b is set so that the operating portion 25 can be stored in the inner space 13 of the drainage frame 2. As described above, the operating portion 25 of this embodiment is substantially U-shaped and includes the grip rod portion 25a and the support rod portions 25b, 25b, and therefore can be operated directly by the operator with his or her own hand, and can also be operated indirectly using a jig or the like.

[0035] Such a drain outlet cover 5 may also be provided with a locking member to prevent it from coming off the cover receiving frame 4. For example, this locking member may be provided on the drain outlet cover 5 in a rotatable manner, and may be switched between a locked state in which it engages with the inner wall of the cover receiving frame 4 and an unlocked state in which it is released by the rotation. A locking member of this configuration has an operating means that is operated to rotate on the top surface of the drain outlet cover 5, and can be switched between the locked state and the unlocked state by manually operating the operating means. Here, the operating means may be configured to be operable with a predetermined jig or may be configured to be directly operated by an operator with their hands, and the latter configuration in particular is easy to use because it does not require a jig.

[0036] In the configuration of Example 1, the drain frame 2 and the upper opening lid 3 are made of metal, preferably cast iron, steel, or pure iron from the perspective of machining, and more preferably cast iron. The lid receiving frame 4, drain outlet lid 5, pressure release valve 17, and shut-off valve 22 are made of resin, preferably thermoplastic resin, more specifically, rigid polyvinyl chloride resin. The operating unit 25, like the drain outlet lid 5, is also made of resin. The pressure release valve 17 is attached to the upper opening lid 3 and is smaller and lighter than the upper opening lid 3. Similarly, the shut-off valve 22 is attached to the drain outlet lid 5 and is smaller and lighter than the drain outlet lid 5. Furthermore, in Example 1, the shut-off valve 22 is heavier than the pressure release valve 17. As a result, a force greater than that required to change the pressure release valve portion 17 from the closed state to the open state is required to change the stop valve portion 22 from the closed state to the open state.

[0037] That is, in the first embodiment, as will be described later, the stop valve unit 22 is converted from a closed state to an open state by the increased internal pressure (including water pressure due to backflow water) in the drain pipe. Then, the internal pressure of the internal space 13 is increased by the pressure released from the inside of the vertical pipe 101 to the internal space 13 of the drain frame 2 via the internal air passage 21, and the pressure release valve unit 17 is converted from a closed state to an open state. Here, in order to convert the stop valve unit 22 from a closed state to an open state, pressure is required to lift the weight of the stop valve unit 22, so the internal pressure of the drain pipe that converts the stop valve unit 22 to an open state is determined according to the weight of the stop valve unit 22. In other words, the weight of the stop valve unit 22 can be set based on the upper limit (threshold) of the internal pressure increase in the drain pipe. Similarly, the internal pressure of the inner space 13 of the drainage frame 2 that converts the pressure release valve section 17 to an open state is determined according to the weight of the pressure release valve section 17, and the weight of the pressure release valve section 17 can be set based on the upper limit (threshold) of the internal pressure increasing in the inner space 13.

[0038] Next, the operation of the drain pipe ventilation system 1 of the first embodiment will be described. Under normal conditions, a sufficient amount of water flows through the drain pipe, and the internal pressure does not increase to the level required to lift the shut-off valve section 22 of the drain pipe ventilation equipment 1, so that the shut-off valve section 22 and the pressure release valve section 17 are each held in a closed state by their own weight, as shown in Figure 1(A).

[0039] When the amount of water flowing through the drain pipe increases due to heavy rain or the like and the internal pressure of the drain pipe exceeds the pressure required to lift the stop valve portion 22 of the drain outlet cover 5, the pressure acting on the stop valve portion 22 from the vertical pipe 101 causes the stop valve portion 22 to rise from the closed state and change to the open state, as shown in Figure 3(A). As a result, the internal pressure of the drain pipe is released to the internal space 13 of the drain frame 2 via the vertical pipe 101 and the internal air passage 21. Here, in this embodiment 1, the stop valve portion 22 rises without being interfered with by the operating portion 25.

[0040] When the internal air passage 21 of the drain outlet cover 5 is opened, the internal pressure of the drain pipe is transmitted to the internal space 13 of the drain frame 2, increasing the internal pressure of the internal space 13. When the internal pressure of the internal space 13 exceeds the pressure required to lift the pressure release valve 17 of the upper opening lid 3, the pressure acting on the pressure release valve 17 causes the pressure release valve 17 to rise from the closed state to the open state, as shown in Figure 3(B). As a result, the internal pressure of the internal space 13 of the drain frame 2 is released, and the internal pressure of the drain pipe is released to the external air space via the vertical pipe 101 and the internal space 13 of the drain frame 2, thereby preventing the internal pressure of the drain pipe from increasing.

[0041] With both the internal vent passage 21 and the external vent passage 16 open, when the internal pressure of the drain pipe decreases and becomes lower than the pressure that lifts the shut-off valve portion 22, the shut-off valve portion 22 changes from an open state to a closed state. As a result, the internal pressure of the inner space 13 of the drain frame 2 also decreases, and the pressure release valve portion 17 changes from an open state to a closed state. In this way, the normal state is restored.

[0042] Furthermore, if backflow water occurs in the drain pipe during heavy rain or other events, and the water pressure of the backflow water traveling up the vertical pipe 101 exceeds the pressure that lifts the shut-off valve 22 of the drain outlet cover 5, the shut-off valve 22 switches to an open state (Figure 3(A)), and the backflow water is released into the internal space 13. Then, if the water pressure of the backflow water released into the internal space 13 exceeds the pressure that lifts the pressure release valve 17 of the upper opening cover 3, the pressure release valve 17 switches to an open state (Figure 3(B)), and the backflow water is released into the external space. This reduces the amount of water flowing back up the drain pipe. In this way, the drain pipe ventilation equipment 1 operates in the same way when backflow water occurs as when the internal pressure of the drain pipe increases as described above.

[0043] In the drain pipe ventilation equipment 1 of Example 1, the drain outlet cover 5 that closes the drain outlet 102 of the vertical pipe 101 is provided with an internal ventilation passage 21 and a closing valve 22 that opens and closes the internal ventilation passage 21, and the upper opening lid 3 that closes the upper opening 11 of the drain frame 2 is provided with an external ventilation passage 16 and a pressure release valve 17 that opens and closes the external ventilation passage 16. With this configuration, when the internal pressure of the drain pipe increases, the internal ventilation passage 21 is opened, and when the internal pressure of the internal space 13 of the drain frame 2 increases due to pressure transmitted from the drain pipe, the external ventilation passage 16 is opened. Similarly, when the water pressure of backflow water generated in the drain pipe increases, the internal ventilation passage 21 is opened, and when the water pressure of backflow water released into the internal space 13 increases, the external ventilation passage 16 is opened. As described above, according to the configuration of the first embodiment, the rise of the closing valve section 22 (opening the internal air passage 21) and the rise of the pressure release valve section 17 (opening the external air passage 16) can be carried out in a stable sequence as the internal pressure of the drain pipe or the water pressure of the backflow water increases. Therefore, the pressure in the drain pipe and the backflow water that increase during heavy rain can be smoothly released to the external air space, and damage to the drain pipe due to the increase in pressure and adverse effects of the backflow water on the upstream drainage equipment can be suppressed.

[0044] Furthermore, in the configuration of Example 1, the drain outlet cover 5 is provided with an operating unit 25, allowing an operator to easily open and close the drain outlet cover 5 from the ground during inspection, maintenance, and other operations. The operating unit 25 of this example can be operated either directly by the operator or indirectly by the operator using a jig or other device. Using the operating unit 25 in this manner improves the operability of inspection and other operations. Because the operating unit 25 is positioned so as not to interfere with the lifting and lowering movement of the stop valve 22, the stop valve 22 can be smoothly and stably raised to an open state when the internal pressure of the drain outlet or the water pressure of backflow water increases. This allows the internal pressure and backflow water to be stably released through the internal air passage 21, further reducing the risk of damage to the drain pipe or malfunctions in upstream drainage equipment due to the internal pressure and backflow water. In addition, in this embodiment 1, since the grip rod portion 25a of the operating portion 25 is disposed above the stop valve portion 22 (on the extension of the imaginary operating line L), if, for example, a sudden increase in internal pressure or backflow water causes the stop valve portion 22 to exceed the maximum raised position and jump out and become detached from the drain outlet cover 5, the stop valve portion 22 can be brought into contact with the grip rod portion 25a of the operating portion 25. Therefore, it is possible to prevent damage to the drain frame 2, the upper opening cover 3, etc. caused by the jumped-out stop valve portion 22.

[0045] In this embodiment 1, the internal pressure of the drain pipe that raises the closing valve portion 22 that closes the internal air passage 21 of the drain outlet cover 5 and the water pressure of the backflow water correspond to the predetermined pressure that converts the closing valve portion of the present invention to an open state. The internal air passage 21, the valve receiving portion 23, and the main valve portion 22a and pressure receiving shaft portion 22b that constitute the closing valve portion 22 constitute the internal pressure release means of the present invention. [Example]

[0046] As shown in Fig. 4, the drain pipe ventilation equipment 1 of the second embodiment is configured such that an operating unit 31 that is lower than the maximum raised position of the closing valve unit 22 is provided on the drain outlet cover 5. Note that, since the configuration of the second embodiment is the same as that of the first embodiment described above except for the operating unit 31, the same components are denoted by the same reference numerals and the description thereof will be omitted.

[0047] The operating unit 31 of the second embodiment is composed of a gripping rod portion 31a arranged directly above the shut-off valve portion 22 and support rod portions 31b, 31b bent downward from both ends of the gripping rod portion 31a, and the support rod portions 31b, 31b are arranged to face each other across the shut-off valve portion 22, and the lower ends of the support rod portions 31b, 31b are embedded and fixed in the drain outlet cover 5. In this way, the operating unit 31 of the second embodiment is also arranged to straddle the shut-off valve portion 22 as in the first embodiment, and the gripping rod portion 31a is located directly above the on-off valve portion 22. Here, in the operating unit 31 of the second embodiment, the lengths of the support rod portions 31b, 31b are set so that the gripping rod portion 31a is at a height position lower than the shut-off valve portion 22 at the maximum raised position. That is, in the operating portion 31 of the second embodiment, the gripping rod portion 31a is located at a lower position than in the first embodiment, and the gripping rod portion 31a is located on the imaginary operating line L.

[0048] By providing such an operating part 31, when the stop valve part 22 is raised from the closed state, it abuts against the grip rod part 31a of the operating part 31 before reaching the maximum raised position, and further raising is disabled. As such, in the configuration of this embodiment 2, the stop valve part 22 cannot be raised to the maximum raised position. Furthermore, when the stop valve part 22 is raised from the closed state, it opens the internal air passage 21, and therefore, internal pressure and backflow water can be released in the open state regardless of whether the maximum raised position is reached or not.

[0049] The drain pipe ventilation equipment 1 of Example 2 has the same configuration as Example 1 except for the operating unit 31, and therefore, like Example 1, the internal ventilation path 21 and the external ventilation path 16 can be opened by the internal pressure of the drain pipe or the water pressure of backflow water, and the internal pressure or backflow water can be released to the external air space. Therefore, like Example 1, the pressure in the drain pipe or the backflow water that increases during heavy rain or the like can be smoothly released to the external air space, and it is possible to prevent the drain pipe from being damaged by the increased pressure, and to prevent the backflow water from adversely affecting the upstream drainage equipment, etc.

[0050] Furthermore, since the drain outlet cover 5 is provided with an operating unit 31, workers can easily open and close the drain outlet cover 5 from the ground during inspection work, etc., improving the workability of the work. Here, the operating unit 31 of Example 2 is substantially U-shaped, so that, as with Example 1 described above, workers can operate it directly with their own hands, and also indirectly using a jig or the like. Furthermore, since the gripping rod 31a of the operating unit 31 of Example 2 is lower than the maximum lift position of the stop valve unit 22, it abuts against the stop valve unit 22 when the stop valve unit 22 is lifted. This allows the stop valve unit 22 and the operating unit 31 to support pressure acting on the stop valve unit 22 (such as the internal pressure of the drain pipe and the water pressure of backflow water), thereby preventing damage to the stop valve unit 22 due to the pressure. Therefore, according to the configuration of Example 2, the stop valve unit 22 can be stably lifted and lowered over a long period of time. [Example]

[0051] As shown in Fig. 5, the drain pipe ventilation equipment of Example 3 is configured to have a detachable operating unit 35 attached to the drain outlet cover 5. Note that, since Example 3 has the same configuration as Example 1 described above, except for the operating unit 35 and the means for attaching and detaching the operating unit 35, the same components are denoted by the same reference numerals and descriptions thereof will be omitted.

[0052] The operating unit 35 of the third embodiment includes a gripping rod 35a that is gripped by an operator, support rods 35b bent downward from both ends of the gripping rod 35a, and an installation plate 35c that spans the lower ends of the support rods 35b, with a screw 35d that protrudes downward from the center of the installation plate 35c. The operating unit 35 is configured such that the gripping rod 35a, support rods 35b, installation plate 35c, and screw 35d are integrally formed.

[0053] The drain outlet cover 5 has a screw hole 36 that opens upward and is provided at a side portion of the shut-off valve portion 22, into which the screw portion 35d of the operating portion 35 is screwed. The operating portion 35 is attached to the drain outlet cover 5 by screwing the screw portion 35d of the operating portion 35 into this screw hole 36. Here, the operating portion 35 is positioned to the side of the shut-off valve portion 22 (not positioned above the shut-off valve portion 22) when attached by screwing the screw portion 35d into the screw hole 36. This prevents the operating portion 35 from interfering with the up-and-down movement of the shut-off valve portion 22. The operating portion 35 is stored in the inner space 13 of the drain frame 2 when attached to the drain outlet cover 5.

[0054] In the configuration of Example 3 provided with such an operating unit 35, the internal air passage 21 and the external air passage 16 can be opened by the internal pressure of the drain pipe or the water pressure of backflow water, and the internal pressure or backflow water can be released to the external air space, as in Example 1. Therefore, as in Example 1, the pressure of the drain pipe or the backflow water that increases during heavy rain or the like can be smoothly released to the external air space, and it is possible to prevent the drain pipe from being damaged by the increase in pressure, and to prevent the backflow water from adversely affecting the upstream drainage equipment, etc.

[0055] Furthermore, when the operating unit 35 is attached to the drain outlet cover 5, as in the first embodiment described above, an operator can easily open and close the drain outlet cover 5 from the ground, improving the workability of inspection work, etc., and the operating unit 35 does not interfere with the lifting and lowering movement of the stop valve unit 22, allowing the stop valve unit 22 to be lifted and lowered smoothly. Detaching the operating unit 35 from the drain outlet cover 5 also facilitates inspection work and allows for easy replacement if the operating unit 35 is damaged or otherwise malfunctions. Furthermore, as in the first embodiment described above, the operating unit 35 of this third embodiment, when attached, can be operated directly by an operator's own hand, or indirectly using a jig or the like. The operation of attaching and removing the operating unit 35 to the drain outlet cover 5 can be performed directly by an operator's own hand, or indirectly using a jig or the like. [Example]

[0056] As shown in Figure 6, the drain pipe ventilation equipment 1 of Example 4 is configured such that the drain outlet cover 5 is provided with an operating unit 41 that can be moved between an operating position and a storage position. The operating unit 41 is generally U-shaped and includes a gripping rod 41a and support rods 41b, 41b bent from both ends of the gripping rod 41a, and the drain outlet cover 5 is provided with a generally U-shaped storage recess 43 that can store the operating unit 41 from above. The lower ends of the support rods 41b, 41b of the operating unit 41 are rotatably connected to the storage recess 43. With this configuration, the operating unit 41 of Example 4 can be moved between the storage position stored in the storage recess 43 of the drain outlet cover 5 and an operating position rotated upward from the storage recess 43.

[0057] Here, the storage recess 43 is formed in the drain outlet cover 5 so as to bypass the shut-off valve portion 22, and the lower ends of the support rod portions 41b, 41b of the operating portion 41 are pivotally connected to both ends of the storage recess 43. When the operating portion 41 is in the operating position where the support rod portions 41b, 41b are raised in the vertical direction, the two support rod portions 41b, 41b are arranged to face each other with the shut-off valve portion 22 in between, and the grip rod portion 41a is positioned directly above the shut-off valve portion 22. In this way, the operating portion 41 straddles the shut-off valve portion 22 in the operating position.

[0058] The configuration of Example 4 is the same as that of Example 1 except for the operating portion 41 and the storage recess 43, and therefore the same components are denoted by the same reference numerals and the description thereof will be omitted.

[0059] The drain pipe ventilation system 1 of the fourth embodiment, like the first embodiment, can open the internal ventilation path 21 and the external ventilation path 16 by the internal pressure of the drain pipe or the water pressure of backflow water, thereby releasing the internal pressure or backflow water to the external air space. Therefore, it has the same advantageous effects as the first embodiment, that is, it can suppress damage to the drain pipe and suppress adverse effects on the upstream drainage system.

[0060] Furthermore, by setting the operating unit 41 to the operating position, as in the first embodiment described above, the worker can easily open and close the drain outlet cover 5 from the ground, improving the workability of inspection work, etc., and by setting the operating unit 41 to the stored position, the operating unit 41 does not interfere with the lifting and lowering movement of the stop valve unit 22, allowing the lifting and lowering movement of the stop valve unit 22 to be performed smoothly. Furthermore, the operating unit 35 of this embodiment 4 can be operated directly by the worker's own hand to convert the position between the stored position and the operating position, and to open and close the drain outlet cover 5 at the operating position, and can also be operated indirectly using a jig or the like. [Example]

[0061] As shown in Figures 7 and 8, the drain pipe ventilation equipment 1 of the fifth embodiment is configured with an operating unit 45 arranged on the drain outlet cover 5 so as to be movable in the vertical direction. The operating unit 45 is configured with a gripping rod portion 45a and support rod portions 45b, 45b bent downward from both ends of the gripping rod portion 45a. The drain outlet cover 5 is formed with insertion holes 47, 47 through the thickness of the drain outlet cover 5 for inserting the support rod portions 45b, 45b of the operating unit 45, and a storage recess 46 for storing the gripping rod portion 45a is formed on the upper surface of the drain outlet cover 5 between the insertion holes 47, 47. The storage recess 46 and the insertion holes 47, 47 are formed in areas of the drain outlet cover 5 excluding the stop valve portion 22.

[0062] In the configuration of the fifth embodiment, the operating portion 45 is normally held in a storage position in which the gripping rod portion 45a is stored in the storage recess 46 by its own weight (FIGS. 7(A) and 8(A)). By lifting the operating portion 45 upward, the operating position can be converted to an operating position in which the gripping rod portion 45a is located above the storage recess 46 (FIGS. 7(B) and 8(B)). Here, non-insertion portions 45c that cannot be inserted into the insertion holes 47 are provided at the lower ends of the support rod portions 45b of the operating portion 45. As a result, the operating portion 45 can be moved to an upper limit position (operating position) in which the non-insertion portions 45c abut against the underside of the drain outlet cover 5, and can be moved vertically between that position and the storage position.

[0063] As described above, the storage recess 46 and the insertion holes 47, 47 are formed in areas other than the stop valve portion 22, and therefore the operating portion 45 in the operating position is not located directly above the stop valve portion 22. Therefore, the operating portion 45 does not interfere with the up and down movement of the stop valve portion.

[0064] The configuration of Example 5 is the same as that of Example 1 except for the operating portion 45, the storage recess 46, and the insertion holes 47, 47. Therefore, the same components are denoted by the same symbols and the description thereof is omitted.

[0065] The drain pipe ventilation system 1 of the fifth embodiment, like the first embodiment, can release the internal pressure of the drain pipe or the backflow water to the outside air space by opening the internal ventilation path 21 and the external ventilation path 16 using the internal pressure of the drain pipe or the water pressure of the backflow water. Therefore, it has the same effect as the first embodiment, that is, it can suppress damage to the drain pipe and suppress adverse effects on the upstream drainage system.

[0066] Furthermore, by using the operation unit 45 as the operation position, an operator can easily perform the removal and installation work of the drain outlet cover 5. Therefore, in the configuration of this embodiment 5, as in the above-mentioned embodiment 1, an operator can easily open and close the drain outlet cover 5 from the ground, improving the workability of inspection work, etc., and since the operation unit 41 does not interfere with the lifting and lowering movement of the stop valve unit 22, the lifting and lowering movement of the stop valve unit 22 can be performed smoothly. Furthermore, the operation unit 35 of this embodiment 5 can be operated directly by an operator with his or her own hand to convert the position between the storage position and the operation position, and to open and close the drain outlet cover 5 at the operation position, and can also be operated indirectly using a jig or the like. [Example]

[0067] As shown in Fig. 9, the drain pipe ventilation equipment 1 of the sixth embodiment has operating units 51, 51 provided on the upper surface of the drain outlet cover 5. The configuration of the sixth embodiment is the same as that of the first embodiment described above except for the operating units 51, 51, and therefore the same components are denoted by the same reference numerals and their explanations are omitted.

[0068] The operating part 51 of Example 6 includes a gripping part 51a that can be grasped by an operator with the hand and a screw part 51b that protrudes downward from the gripping part 51a, and is attached to the drain outlet cover 5 by screwing the screw part 51b into a screw hole 52 of the drain outlet cover 5. Here, the two operating parts 51 are arranged to face each other with the closing valve part 22 in between.

[0069] The two operating parts 51, 51 arranged on the drain outlet cover 5 in this way have gripping parts 51a, 51a of each operating part 51, 51 protruding from the top surface of the drain outlet cover 5, and are used by workers to grasp and lift these parts with their hands when removing and installing the drain outlet cover 5. Here, the two operating parts 51, 51 are arranged facing each other across the closing valve part 22 arranged in the center of the drain outlet cover 5, so by grasping and holding both of them, the worker can lift the drain outlet cover 5 in a balanced manner.

[0070] The drain pipe ventilation system 1 of the sixth embodiment, like the first embodiment, can release the internal pressure of the drain pipe or the backflow water to the outside air space by opening the internal ventilation path 21 and the external ventilation path 16 using the internal pressure of the drain pipe or the water pressure of the backflow water. Therefore, it has the same effect as the first embodiment, that is, it can suppress damage to the drain pipe and suppress adverse effects on the upstream drainage system.

[0071] Furthermore, the provision of the operating units 51, 51 allows for easy removal and installation of the drain outlet cover 5. As in the first embodiment, this allows workers to easily open and close the drain outlet cover 5 from the ground, improving the workability of inspection work, etc. The operating units 51, 51 of this embodiment 6 can also be operated directly by the worker's own hand, or indirectly using a jig or the like. Furthermore, since the operating units 51, 51 do not interfere with the lifting and lowering movement of the stop valve unit 22, the lifting and lowering movement of the stop valve unit 22 can be performed smoothly. Furthermore, since the operating unit 51 of this embodiment 6 is detachable from the drain outlet cover 5, it has the advantage of being easily replaceable in the event of damage or other malfunction.

[0072] The present invention is not limited to the above-described Examples 1 to 6, and can be modified as appropriate within the scope of the present invention. For example, the dimensions and shapes of the components in the above-described Examples can be modified as appropriate.

[0073] In the configurations of Examples 1 to 6, the upper opening lid is made of metal and the pressure release valve portion, drain lid, and close valve portion are made of resin, but this is not a limitation and the molding materials for each can be changed as appropriate. Note that here, the weight relationship between the upper opening lid and the pressure release valve portion, the weight relationship between the drain lid and the close valve portion, and the weight relationship between the pressure release valve portion and the close valve portion are not limited to the molding materials, and a configuration set similar to that of Example 1 described above is preferred.

[0074] In the configurations of Examples 1 to 6, the operating portion is made of resin, but the present invention is not limited to this and the molding material can be changed as appropriate.

[0075] Although the configurations of Examples 1 to 6 are configured to have a pressure release valve that closes the external ventilation path of the upper opening lid, the present invention is not limited to this, and the configuration may not have a pressure release valve.

[0076] In the configurations of Examples 1 to 5, a substantially U-shaped operating part is provided on the drain outlet lid, but the configuration of the operating part is not limited to this and can be changed as appropriate. For example, the operating part may include a substantially circular grip part and a support rod part extending downward from the grip part, and the lower end of the support rod part is attached to the drain outlet lid.

[0077] In the configurations of Examples 1 to 5, one operating unit is provided on the drain outlet cover, but this is not limited thereto and multiple operating units may be provided. Similarly, in the configuration of Example 6, one operating unit may be provided, or three or more operating units may be provided. In addition, in a configuration where multiple operating units are provided, all operating units may be fixed to the drain outlet cover or detachably attached, or some operating units may be fixed and other operating units may be detachable. [Explanation of symbols]

[0078] 1. Drainage pipe ventilation equipment 2 Drainage frame 3 Top opening lid 5 Drain cover 11 Top opening 13 Inner cavity 16 External ventilation channel 17 Pressure release valve 21 Internal ventilation channel 22 Closure valve section 25,31,35,41,45,51 Operation section 102 Drain port L Virtual operating line

Claims

1. a drainage frame having an upper opening that opens upward and an inner space that communicates with the inside of the drainage pipe via a drainage outlet provided below the upper opening; an upper opening cover attached to the upper opening and closing the upper opening; The upper opening cover is used in a drainage pipe ventilation system having an external ventilation path that connects the external space above the upper opening cover with the internal space, The drain pipe ventilation equipment is attached to the drain outlet portion so as to close the drain outlet portion, An internal ventilation path that connects the inside of the drain pipe with the internal space; a closing valve portion that closes the internal ventilation path; an operating unit operated by an operator for attaching and detaching the drain outlet; A drain cover characterized by comprising:

2. The closing valve portion is configured to be convertible between a closed state in which the internal air passage is closed and an open state in which the internal air passage is opened by being raised from the closed state, and an internal pressure release means is provided for converting the closing valve portion from the closed state to the open state by the internal pressure of the drain pipe when the internal pressure of the drain pipe reaches a predetermined pressure or higher; The drain cover described in claim 1, characterized in that the operating portion is arranged so as not to interfere with the conversion operation of the closing valve portion that converts the closing valve portion between the closed state and the open state.

3. The closing valve portion is configured to be convertible between a closed state in which the internal air passage is closed and an open state in which the internal air passage is opened by being raised from the closed state, and an internal pressure release means is provided for converting the closing valve portion from the closed state to the open state by the internal pressure of the drain pipe when the internal pressure of the drain pipe reaches a predetermined pressure or higher; The operation unit includes: A drain cover as described in claim 1, characterized in that it is positioned above the closing valve portion and is configured to abut against the closing valve portion when the closing valve portion changes from the closed state to the open state.

4. The drain cover described in claim 1, characterized in that the operating portion is configured to be converted into a storage position that cannot be operated by an operator and an operating position that is located above the storage position and can be operated by the operator.

5. The drain cover according to claim 1, wherein the operating portion is detachably provided.

6. a drainage frame having an upper opening that opens upward and an inner space that communicates with the inside of the drain pipe via a drain outlet portion provided below the upper opening, the upper opening cover being attached to the upper opening and closing the upper opening; a drain outlet cover attached to the drain outlet portion and closing the drain outlet portion; A drain pipe ventilation system comprising: the upper opening cover has an external ventilation passage that communicates an external space above the upper opening cover with an internal space of the drainage frame, The drain outlet cover is An internal ventilation path that connects the inside of the drain pipe with the internal space; a closing valve portion that closes the internal ventilation path; an operating unit operated by an operator for attaching and detaching the drain outlet; A drainage pipe ventilation system characterized by comprising:

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