Lid unit for riser pipe

Abstract

To provide a lid unit for a riser pipe capable of mounting a new lid body regardless of the shape and size of a lid receiving body.SOLUTION: Since the riser pipe lid unit includes the lid mounting adapter 70 mounted on the outer frame portion 31 provided at the upper end portion of the riser pipe 20 and the pressure releasing lid 30A supported via the lid mounting adapter 70, a new pressure releasing lid 30A having a different shape or size can be mounted together with the lid mounting adapter 70 regardless of the shape or size of the outer frame portion 31 mounted on the existing riser pipe 20.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to a riser pipe lid unit for attaching a lid body to a riser pipe rising from a drainage pipe laid within a residential area, for example. [Background technology]

[0002] Conventionally, underground drainage pipelines formed by manholes and pipes, etc., have been installed within residential areas. These manholes have riser pipes that rise from the manhole to the ground for the purpose of maintaining the drainage pipelines, and some manholes have a cover at the top end that can be opened and closed to allow inspection and maintenance of the manhole (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 4-119882 [Patent Document 2] Japanese Patent Application Publication No. 9-328793 Summary of the Invention [Problem to be solved by the invention]

[0004] The lids described in Patent Documents 1 and 2 are attached to a lid receiver provided at the upper end of the riser pipe, and the lid receiver is firmly fixed to the riser pipe via adhesive or the like. Therefore, when attaching a new lid, if an attempt is made to attach a type of lid that does not match the shape or size of the lid receiver, a gap may occur between the lid receiver and the lid, or the lid may become loose, making it impossible to attach the lid properly.

[0005] The present invention was made in response to such problems, and aims to provide a riser pipe lid unit that allows a new lid body to be attached regardless of the shape or size of the lid receiver. [Means for solving the problem]

[0006] In order to solve the above problem, the riser pipe cover unit according to claim 1 of the present invention comprises: a lid mounting adapter attached to a lid receiver provided at the upper end of the riser pipe; a lid body supported via the lid mounting adapter; The lid mounting adapter has a first flange portion that extends outward and is placed over the upper end surface of the lid receiver, and the lid body is placed so that its upper surface is approximately flush with the upper surface of the first flange portion. This feature allows a new lid to be attached together with the lid mounting adapter regardless of the shape or size of the lid receiver attached to the existing riser pipe. Also, because the upper surface of the first flange and the upper surface of the lid are substantially flush with each other, steps that could cause tripping or the lid to come off unintentionally are prevented. The riser pipe lid unit of claim 2 of the present invention is the riser pipe lid unit according to claim 1, The cover is characterized in that it is a pressure-relief cover having pressure relief means capable of releasing the internal pressure in the drainage pipe to the outside of the drainage pipe. According to this feature, when the internal pressure in the drainage pipe increases, air is discharged from the pressure release means to the outside of the drainage pipe, thereby making it possible to suppress the increase in internal pressure in the drainage pipe, thereby preventing the lid from coming off due to an increase in internal pressure. The riser pipe lid unit of claim 3 of the present invention is the riser pipe lid unit according to claim 2, A plurality of the riser pipes are provided in the drainage pipeline, The pressure release lid is characterized in that it can be installed on one of the riser pipes provided in the drainage pipeline that is located in a pressure increase generation section and has an opposing end wall portion that faces the backflow of increased internal pressure within the drainage pipeline. According to this feature, the air pressurized in the piping toward the pressure release means installed in the riser pipe located at the pressure rise occurrence portion hits the opposite end wall portion and rises inside the riser pipe, making it easier for the pressure release means to operate and efficiently release the pressure inside the drainage pipe to the outside. Therefore, seal water breach inside the building can be efficiently suppressed with a small number of pressure release means. In this invention, the "opposing end wall" refers to the vertical wall located at the upstream end of the drainage pipeline in the longitudinal direction, and the "pressure rise occurring portion" refers to the portion where there is no flow path for the increased internal pressure that flows back through the drainage pipeline. Although the upstream end of the drainage pipeline is connected to a drainage pipe from a building, the drainage pipe has a smaller diameter than the drainage pipeline, so it is considered that there is no flow path for the increased internal pressure to escape. The riser pipe lid unit of claim 4 of the present invention is a riser pipe lid unit according to any one of claims 1 to 3, The lid mounting adapter is characterized in that, when the first flange portion is supported by the lid receiver, the lower portion of the lid mounting adapter is spaced apart from the lid receiver. According to this feature, the lid mounting adapter is supported by the lid receiver only at the first flange portion, so there is no rattle in the lid mounting adapter. The riser pipe lid unit of claim 5 of the present invention is a riser pipe lid unit according to any one of claims 1 to 4, The lid mounting adapter is characterized in that it is fixed to the lid receiver by a fixing means. This feature prevents the lid mounting adapter from coming off the lid receiver. The riser pipe lid unit of claim 6 of the present invention is a riser pipe lid unit according to any one of claims 1 to 5, the lid mounting adapter has a second flange portion extending inward and a frame-shaped portion extending downward from the second flange portion, When the lid is supported by the lid mounting adapter, a seal member provided on the outer peripheral surface of the lid abuts against the inner peripheral surface of the frame-shaped portion. According to this feature, by providing a frame-shaped portion, it is not necessary to change the size or shape in order to abut the sealing member of the lid body, which has a different size, against the inner wall of the riser pipe, so that the upper end opening of the riser pipe can be sealed appropriately. The lid body replacement method of claim 7 of the present invention comprises: This is a lid replacement method for replacing a lid placed on a lid receiving frame formed at the opening at the upper end of an existing upper pipe, and is characterized by including an installation step of removing the lid and placing a first flange portion extending outward from the lid mounting adapter on the upper end surface of the lid receiving frame to attach the lid mounting adapter, and a step of attaching the pressure release lid so that the upper surface of the first flange portion and the upper surface of the pressure release lid are approximately flush with each other. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a perspective view showing an exhaust pressure pipe according to the first embodiment of the present invention. [Figure 2] 1A is a cross-sectional view showing a closed state of a pressure release means of an exhaust pressure pipe according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view showing an open state. [Figure 3] FIG. 2 is a plan view showing a test state of the exhaust pressure pipe according to the first embodiment of the present invention. [Figure 4] FIG. 10 is a perspective view showing an exhaust pressure pipe according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a plan view showing a test state of the exhaust pressure pipe according to the second embodiment of the present invention. [Figure 6] FIG. 10 is a perspective view showing an exhaust pressure pipe according to a third embodiment of the present invention. [Figure 7] FIG. 10 is a plan view showing a test state of the exhaust pressure pipe according to the third embodiment of the present invention. [Figure 8] 10A and 10B are schematic diagrams showing an exhaust pressure pipe according to a modified example, in which FIG. 10A shows an open valve state and FIG. 10B shows a closed valve state. [Figure 9] 1(a) is a plan view showing a state in which a cover member is attached to the upper end of the riser pipe, and FIG. 1(b) is a cross-sectional view taken along the line AA in FIG. [Figure 10]1(a) is a plan view showing a state in which a pressure release lid is attached to the upper end of the riser pipe, and FIG. 1(b) is a cross-sectional view taken along the line BB of FIG. 1(a). [Figure 11] 1A is a plan view showing a lid mounting adapter, and FIG. 1B is a cross-sectional view taken along the line CC of FIG. [Figure 12] 10(a) and 10(b) are diagrams showing a method for attaching a pressure release lid to the upper end of a riser pipe using a lid attachment adapter. [Figure 13] 1(a) is a plan view showing the state in which a pressure release lid is attached to the upper end of the riser pipe using a lid attachment adapter, and FIG. 1(b) is a DD cross-sectional view of FIG. 1(a). [Figure 14] 10(a) to 10(c) are diagrams for explaining types of outer frame portions. [Figure 15] (a) is a plan view showing the state in which a pressure release lid is attached to the upper end of a B-type riser pipe using a lid attachment adapter, and (b) is an E-E cross-sectional view of (a). [Figure 16] (a) and (b) are diagrams showing how to attach a pressure release lid to the upper end of a C-type riser pipe using a lid attachment adapter. [Figure 17] FIG. 10(a) is a plan view showing a lid mounting adapter as a first modified example, and FIG. 10(b) is a cross-sectional view taken along line FF of FIG. [Figure 18] 10A is a plan view showing a state in which a pressure release lid is attached to the outer frame of type B together with a lid attachment adapter as modified example 1, and FIG. 10B is a cross-sectional view taken along line GG of FIG. [Figure 19] FIG. 10 is a vertical cross-sectional view showing a state in which a pressure release lid is attached to a C-type outer frame together with a lid attachment adapter as Modification 1. [Figure 20] 10A is a plan view showing a state in which a pressure release lid is attached to the outer frame of type B together with a lid attachment adapter as modified example 2, and FIG. 10B is a cross-sectional view taken along line HH of FIG. [Figure 21] (a) is a longitudinal cross-sectional view showing the state in which the pressure release lid is attached to the outer frame together with the lid mounting adapter as variant example 3, and (b) is a longitudinal cross-sectional view showing the state in which the pressure release lid is attached to the outer frame together with the lid mounting adapter. [Figure 22] FIG. 10 is a vertical cross-sectional view showing a state in which a pressure release lid is attached to an A-type outer frame portion together with a lid attachment adapter as a fourth modified example. [Figure 23] FIG. 10 is a vertical cross-sectional view showing a state in which a pressure release lid is attached to the outer frame of type B together with a lid attachment adapter as modified example 5. [Figure 24] 10A is a plan view showing a state in which a pressure release lid is attached to the outer frame of type B together with a lid attachment adapter as modified example 6, and FIG. 10B is a cross-sectional view taken along line II of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Form 1] The riser pipe cover unit of type 1 is a lid mounting adapter attached to a lid receiver provided at the upper end of the riser pipe; a lid body supported via the lid mounting adapter; A riser pipe cover unit consisting of: According to this feature, a new lid can be attached together with the lid attachment adapter regardless of the shape and size of the lid receiver attached to the existing riser pipe.

[0009] [Form 2] The riser pipe lid unit of form 2 is the riser pipe lid unit according to form 1, The lid mounting adapter is a first flange portion supported by the lid receiver; a second flange portion that supports the lid; A hanging portion extending downward; are integrally molded. According to this feature, the hanging portion is inserted into the upper end opening of the riser pipe and the first flange portion is supported by the lid receiver, making it possible to support the lid body via the second flange portion, so that a new lid body can be attached together with the lid mounting adapter regardless of the shape or size of the lid receiver attached to the existing riser pipe.

[0010] [Form 3] The riser pipe lid unit of form 3 is the riser pipe lid unit according to form 1, The lid mounting adapter is a first flange portion extending outward; a second flange portion extending inward; A hanging portion extending downward; are integrally molded. According to this feature, the hanging portion is inserted into the upper end opening of the riser pipe and the first flange portion is supported by the lid receiver, making it possible to support the lid body via the second flange portion, so that a new lid body can be attached regardless of the shape or size of the existing riser pipe.

[0011] [Form 4] The riser pipe lid unit of form 4 is the riser pipe lid unit according to any one of forms 1 to 3, The cover includes a pressure release cover having a pressure release means capable of releasing the internal pressure in the drainage pipe laid in the residential area to the outside of the drainage pipe. It is characterized by the following. According to this feature, when the internal pressure in the drainage pipe increases, air is discharged from the pressure release means to the outside of the drainage pipe, thereby making it possible to suppress the increase in internal pressure in the drainage pipe, thereby preventing the lid from coming off due to an increase in internal pressure.

[0012] [Form 5] A riser pipe lid unit of form 5 is the riser pipe lid unit according to form 4, A plurality of the riser pipes are provided in the drainage pipeline, The pressure release lid can be installed on the riser pipe located in a pressure rise occurrence portion, which has an opposing end wall portion that faces the backflow of internal pressure increased in the drainage pipeline, among the riser pipes installed in the drainage pipeline laid in a residential area. It is characterized by the following. According to this feature, the air pressurized in the piping toward the pressure release means installed in the riser pipe located at the pressure rise occurrence portion hits the opposite end wall portion and rises inside the riser pipe, making it easier for the pressure release means to operate and efficiently release the pressure inside the drainage pipe to the outside. Therefore, seal water breach inside the building can be efficiently suppressed with a small number of pressure release means. In this invention, the "opposing end wall" refers to the vertical wall located at the upstream end of the drainage pipeline in the longitudinal direction, and the "pressure rise occurring portion" refers to the portion where there is no flow path for the increased internal pressure that flows back through the drainage pipeline. Although the upstream end of the drainage pipeline is connected to a drainage pipe from a building, the drainage pipe has a smaller diameter than the drainage pipeline, so it is considered that there is no flow path for the increased internal pressure to escape.

[0013] [Form 6] The riser pipe lid unit of form 6 is the riser pipe lid unit according to any one of forms 2 to 5, The upper end of the lid receiver is flush or approximately flush with the ground, The lid mounting adapter has an inclined portion that slopes downward from the outer periphery of the first flange portion toward the inside. It is characterized by the following. According to this feature, even if the lid mounting adapter is installed protruding from the ground because the first flange portion is supported by the lid receiver, a downwardly sloping surface is formed on the outer periphery of the lid mounting adapter, making it less likely that a foot will hit the lid mounting adapter, thereby reducing the risk of tripping.

[0014] [Form 7] The riser pipe lid unit of form 7 is the riser pipe lid unit according to any one of forms 2 to 6, The upper surface of the second flange portion is located lower than the first flange portion. It is characterized by the following. According to this feature, the lid can be provided so as not to protrude upward as much as possible compared to the upper surface of the first flange portion.

[0015] [Form 8] The riser pipe lid unit of form 8 is the riser pipe lid unit according to any one of forms 2 to 7, The hanging portion is formed in a ring shape. It is characterized by the following. According to this feature, the hanging portion is inserted along the inner peripheral surface of the lid receiver, so that the lid body installed along this hanging portion can be supported at the center of the upper end opening of the riser pipe.

[0016] [Form 9] The riser pipe lid unit of form 9 is the riser pipe lid unit according to any one of forms 2 to 8, When the first flange portion of the lid mounting adapter is supported by the lid receiver, the lower portion of the lid mounting adapter is spaced apart from the lid receiver. It is characterized by the following. According to this feature, the lid mounting adapter is supported by the lid receiver only at the first flange portion, so there is no rattle in the lid mounting adapter.

[0017] [Form 10] The riser pipe lid unit of form 10 is the riser pipe lid unit according to any one of forms 1 to 9, The first flange portion is fixed to the riser pipe with an adhesive. It is characterized by the following. This feature prevents the lid mounting adapter from coming off the riser pipe.

[0018] [Form 11] The riser pipe lid unit of form 11 is the riser pipe lid unit according to any one of forms 1 to 10, the lid mounting adapter has a locking portion that can be locked to the lid receiver, The locking portion is locked to the lid receiver, thereby restricting deviation from the riser pipe. It is characterized by the following. According to this feature, simply by engaging the lid mounting adapter with the lid receiver, the lid mounting adapter can be prevented from coming off the riser pipe.

[0019] [Form 12] A riser pipe lid unit of aspect 12 is the riser pipe lid unit according to aspect 11, The locking portion is provided so that the lid body is supported by the lid mounting adapter, making it difficult to release the locking state between the lid body and the lid receiver. It is characterized by the following. According to this feature, when the lid body is supported, the engagement between the locking portion and the lid receiver cannot be easily released, thereby preventing the lid mounting adapter from accidentally coming off the riser pipe.

[0020] [Form 13] The riser pipe lid unit of form 13 is the riser pipe lid unit according to any one of forms 2 to 12, the lid mounting adapter has a frame-shaped portion extending downward from the second flange portion, When the lid is supported by the lid mounting adapter, a seal member provided on the outer peripheral surface of the lid abuts against the inner peripheral surface of the frame-shaped portion. It is characterized by the following. According to this feature, by providing a frame-shaped portion, it is not necessary to change the size or shape in order to abut the sealing member of the lid body, which has a different size, against the inner wall of the riser pipe, so that the upper end opening of the riser pipe can be sealed appropriately. [Example]

[0021] A pressure exhaust pipe according to a first embodiment of the present invention will be described in detail below with reference to the drawings. In this embodiment, as shown in Fig. 1, a case will be described in which a pressure exhaust pipe 1 is connected to a detached house 2. The pressure exhaust pipe 1 is connected to drainage means extending from water-related areas such as a bathroom, toilet, and kitchen (not shown) of the detached house 2, and to a sewer pipe 3 outside the premises, and drains domestic wastewater from the house 2 into the sewer pipe 3. The pressure exhaust pipe 1 is buried within the premises, and the sewer pipe 3 is buried in a road outside the premises.

[0022] The pressure relief pipe 1 according to this embodiment includes a pipe body 10, a riser pipe 20, and a pressure relief means 30.

[0023] The piping main body 10 is a cylindrical pipe that runs from the drainage means to the sewer. The drainage means is a drainage pipe 11 that extends from the water supply of the house 2 and has a smaller diameter than the piping main body 10. The piping main body 10 is arranged with a predetermined drainage gradient from the upstream side to the downstream side. In this embodiment, the piping main body 10 is formed in a straight line and extends along the side of the detached house 2. Note that the shape of the piping main body 10 is just an example and is determined appropriately depending on the shape of the building in which it is installed and the location of the water supply.

[0024] A plurality of riser pipes 20 (seven in this embodiment) are provided on the piping main body 10, and are provided at connection positions of the drainage pipes 11 extending from the house 2. The riser pipes 20 are formed in a cylindrical shape and rise from the underground piping main body 10 toward the ground surface, thereby enabling inspection of the inside of the pipes and the manhole. The upper end of the riser pipes 20 is exposed and flush with the ground surface. A cover member 21 or pressure release means 30 is removably attached to the upper end of the riser pipes 20. The cover member 21 or pressure release means 30 is attached to the upper end of the riser pipes 20, and by removing the cover member 21 or pressure release means 30, the inside of the riser pipe 20 can be inspected.

[0025] The pressure release means 30 releases the internal pressure of the piping main body 10 to the outside. In this embodiment, the pressure release means 30 is configured as a pressure release lid attached to the upper end of the riser pipe 20. As shown in FIG. 2 , the pressure release lid includes an outer frame portion 31, an inner frame portion 32, and an elevation portion 33.

[0026] The outer frame portion 31 is a portion that is detachably fixed to the upper end of the riser pipe 20. The outer frame portion 31 is cylindrical, and the inner frame portion 32 is inserted inside the outer frame portion 31. A male thread portion is formed on the outer peripheral surface of the outer frame portion 31, and by screwing this male thread portion into a female thread portion on the inner peripheral surface of the upper end of the riser pipe 20, the outer frame portion 31 is fixed in an airtight state to the upper end of the riser pipe 20. A step portion 34 that narrows in diameter on the lower side is formed on the inner peripheral surface of the outer frame portion 31. The inner frame portion 32 is designed to be placed on the step portion 34.

[0027] The inner frame 32 is a portion that holds the lifting / lowering unit 33 so that it can be raised and lowered. The inner frame 32 is cylindrical, and the lifting / lowering unit 33 is inserted into the inner frame 32. A flange 35 that extends outward is formed at the outer periphery of the inner frame 32. The flange 35 is placed on a step 34 of the outer frame 31, thereby locking the inner frame 32 to the outer frame 31 so that it cannot fall off. An annular seal 36 is attached to the underside of the flange 35, so that the inner frame 32 is airtightly fitted inside the outer frame 31. An inclined surface 37 that narrows in diameter as it extends downward is formed at the inner periphery of the inner frame 32 at the upper end. The lifting / lowering unit 33 is placed above the inclined surface 37. A locking portion 38 is provided below the inclined surface 37 to lock the lifting / lowering unit 33 when it is raised. The locking portion 38 is formed to protrude inward.

[0028] The lifting section 33 is a section that moves up and down relative to the inner frame section 32. When in the lowered position, the pressure release lid is closed (see FIG. 2(a)), and when in the raised position, the pressure release lid is opened (see FIG. 2(b)). The lifting section 33 includes a cover plate 39 and a shaft section 40. The cover plate 39 is disk-shaped, and the outer peripheral edge of its lower surface is shaped to roughly follow the inclined surface section 37 of the inner frame section 32. An annular seal member 41 is provided on the outer peripheral edge of the lower surface of the cover plate 39, and the seal member 41 adheres closely to the inclined surface section 37, thereby ensuring airtightness inside and outside the pressure release lid. The shaft section 40 hangs down from the center of the cover plate 39. The lower end of the shaft section 40 extends below the locking section 38 of the inner frame section 32. A stopper 43 that protrudes outward is formed at the lower end of the shaft section 40. The stopper 43 is a part that prevents the lifting / lowering portion 33 from slipping out of the inner frame portion 32, and when the lifting / lowering portion 33 is raised, it locks the lower side of the locking portion 38 at the lower end of the locking portion 38.

[0029] The pressure relief means 30 having such a configuration is installed in the riser pipe 20 located in the pressure rise occurrence section 12 among the plurality of riser pipes 20, 20·· arranged in a straight line. The pressure rise occurrence section 12 is a section in the riser pipe 20 where there is no flow path for backflow of internal pressure (a backflow of air generated when internal pressure rises in the piping main body 10 and flows upstream) of the riser pipe 20, and the backflow tends to rise upward. The pressure rise occurrence section 12 has an opposing end wall 13 that faces the backflow of internal pressure. The opposing end wall 13 is a side wall located at the upstream end of the piping main body 10 in the longitudinal direction. In this embodiment, the end wall located at the upstream end of the linear piping main body 10 is the opposing end wall 13. In other words, the pressure relief means 30 is installed in the riser pipe 20 located at the most upstream part of the piping main body 10 among the plurality of riser pipes 20, 20··. In the pressure rise generating section 12, the backflow of the internal pressure collides with the opposing end wall section 13, changes direction, and rises toward the top of the riser pipe 20. This makes it easier to open the pressure release means 30 provided at the upper end of the riser pipe 20. Note that although a drainage pipe 11 from the house 2 is connected to the upstream end of the piping main body 10, the drainage pipe 11 has a smaller diameter than the piping main body 10, and therefore, in the pressure rise generating section 12, it is considered that there is no flow path for the increased internal pressure to escape.

[0030] For the exhaust pressure piping 1 configured as described above, a pressure relief device 30 was installed in the riser pipe 20 at a predetermined position, and an experiment was conducted to determine whether or not a seal failure would occur in the seal trap connected to the riser pipe 20 by increasing the internal pressure of the piping main body 10. The exhaust pressure piping 1 used in the experiment was a straight piping with a nominal diameter of 100 mm and installed at a gradient of 2 / 100. The riser pipe 20 was a piping with a nominal diameter of 150 mm. The pressure relief device 30 used was a pressure relief lid (CW-AI Light 150) manufactured by Maezawa Chemical Industries, Ltd., and the other riser pipes 20 were equipped with sealing lids (C-AI Light 150) manufactured by Maezawa Chemical Industries, Ltd. As shown in FIG. 3 , the riser pipes 20 were arranged at intervals of 4 m, 2 m, 2 m, 3 m, 4 m, and 4 m from the upstream end of the straight piping main body 10. The installation positions of the riser pipes 20 are A1, B1, C1, D1, E1, F1, and G1 from the downstream side. A backflow generating device 50 for generating a backflow of internal pressure is installed 2 m downstream from the most downstream riser pipe 20 (A1). Note that "backflow" refers to a flow in the opposite direction to the natural flow direction due to the gradient.

[0031] The backflow generating device 50 generates a backflow at a predetermined pressure in the piping main body 10. The backflow conditions are, for example, those simulating a sudden downpour, and are intended to reproduce a backflow that causes water to splash out of the trap.

[0032] In this example, a first water seal trap 51a (trap A) is connected to the riser pipe 20 installed at installation position C1, and a second water seal trap 51b (trap B) is installed at the riser pipe 20 installed at installation position G1. Water was poured into each water seal trap 51a, 51b, and the amount of water splashing out of the trap due to a pressure increase in the piping main body 10 using the backflow generating device 50 was measured while appropriately changing the installation position of the pressure release means 30. The experimental results are shown in Table 1 below.

[0033] [Table 1]

[0034] As shown in Table 1, when the pressure release lid (pressure release means 30) was not installed (NO1), all of the water in both traps A and B splashed out, and the amount of splashing out was unmeasurable (the seal was broken) (shown as "Splash out" in Table 1).

[0035] When the pressure release lid was installed on the riser pipe 20 at installation position A1 (NO2), all of the water in both traps A and B splashed out, making it impossible to measure the amount of splashed out (seal water was broken).

[0036] Even when the pressure release lid was installed on the riser pipe 20 at installation position B1 (NO3), all of the water in both traps A and B splashed out, and the amount of splashing out could not be measured (the seal was broken).

[0037] When the pressure release lid was installed on the riser pipe 20 at installation position C1 (NO4), all the water splashed out of trap B, making it impossible to measure the amount of splashing out. However, the amount of water splashing out of trap A (the height of the water level that dropped from the water level when the trap was full) was only 22 mm. This is thought to be because the pressure was dispersed to the pressure release lid at installation position C1, reducing the pressure rise in trap A.

[0038] When pressure release lids were installed on the riser pipe 20 at installation positions B1 and C1 (No. 5), all of the water splashed out of Trap B, making it impossible to measure the amount of splashing, but the amount of water splashing out of Trap A was only 20 mm. This is thought to be because the pressure was dispersed to the pressure release lid at installation position C1, reducing the pressure increase in Trap A. Furthermore, by providing a pressure release lid at installation position B1 as well, the overall pressure inside the piping main body 10 was reduced, and the amount of water splashing out of Trap A was thought to be less than in No. 4.

[0039] When the pressure release cover was installed on the riser pipe 20 at installation position G1 (pressure rise generation portion 12) (NO6), the amount of water splashing out of trap A was 8 mm, and the amount of water splashing out of trap B was 7 mm, which was a significant reduction compared to the other installation positions. This is thought to be because the rising pressure that flowed back upstream inside the piping main body 10 collided with the end wall (opposing end wall portion 13) at the upstream end of the piping main body 10, changed direction, and rose toward the top of the riser pipe 20, and the pressure in the piping main body 10 was efficiently released to the outside by the opening of the pressure release means 30 provided at the upper end of the riser pipe 20, suppressing the pressure rise and reducing the amount of water splashing out of traps A and B.

[0040] From the above results, it was found that in a linear piping main body 10, the internal pressure of the piping main body 10 can be most efficiently relieved by installing the pressure relief device 30 on the most upstream riser pipe 20. In other words, with the pressure relief piping 1 of this embodiment, the pressure built up inside the piping hits the most upstream end wall (opposing end wall 13) of the piping main body 10 and rises inside the riser pipe 20, flowing toward the pressure relief device 30 installed at the upper end of the riser pipe 20. This facilitates the activation of the pressure relief device 30, allowing the pressure inside the piping main body 10 to be efficiently released to the outside. Therefore, with a small number of pressure relief devices 30 (one at the upstream end), the rise in internal pressure of the piping main body 10 can be suppressed, and water seal failure in the water-related facilities in the house 2 can be efficiently prevented. Furthermore, a pressure relief lid is not required on the most downstream riser pipe 23, which has traditionally been provided with a pressure relief lid.

[0041] Furthermore, the pressure relief pipe 1 according to the present invention can be formed even in an existing drainage pipe by replacing the cover member provided at the upper end of the riser pipe 20 with a pressure relief cover. [Example]

[0042] Next, a pressure exhaust pipe 1a according to a second embodiment of the present invention will be described in detail with reference to the drawings. As shown in Fig. 4, the pressure exhaust pipe 1a according to this embodiment has a pipe main body 10a that branches from the downstream side toward the upstream side and is disposed so as to surround a house 2 from three sides. Specifically, the pipe main body 10a includes a branching portion 15, a downstream pipe 16a, and a first branch pipe 16b and a second branch pipe 16c that branch off from the downstream pipe 16a in different directions.

[0043] The branching section 15 is configured as a T-shaped branch pipe, with pipes connected to both upper left and right ends and the lower end of the T. The downstream pipe 16a is located downstream of the pipe main body 10a and is connected to the sewer pipe 3. The downstream pipe 16a is connected to one end of the T of the branching section 15 in the left-right direction.

[0044] First branch pipe 16b is one of the branch pipes branching upstream from downstream pipe 16a, and is connected to the other end of branch section 15 in the left-right direction of the T-shape. In other words, first branch pipe 16b branches from branch section 15 in a direction along downstream pipe 16a. First branch pipe 16b has an L-shape in plan view and extends along two sides of house 2. Standpipes 20 are provided at one location in the bent portion of the L-shape of first branch pipe 16b, and at two locations: approximately the middle and the upstream end of the straight portion upstream of the bent portion.

[0045] The second branch pipe 16c is the other of the branch pipes branching upstream from the downstream pipe 16a, and is connected to the lower end of the T-shaped branch section 15. In other words, the second branch pipe 16c branches in a direction intersecting the downstream pipe 16a (in this embodiment, a direction perpendicular to the downstream pipe 16a). The second branch pipe 16c is formed in a straight line and extends along one side of the house 2. The riser pipes 20 are provided at one location at the branch section 15, and at two locations: approximately the middle of the straight section upstream of the branch section 15, and the upstream end.

[0046] The pressure release means 30 is configured with a pressure release lid similar to that in the first embodiment. The pressure release means 30 is installed in the riser pipe 20, among the multiple riser pipes 20, 20, that is located in the pressure rise generation section 12. In this embodiment, the end wall located at the upstream end of the first branch pipe 16b and the end wall located at the upstream end of the second branch pipe 16c face the backflow of internal pressure, and the end wall located at the upstream end of the first branch pipe 16b is the opposed end wall section 13 in claim 1, and the upstream end of the first branch pipe 16b is the pressure rise generation section 12. The pressure release means 30 is installed in the riser pipe 20 provided at the upstream end of the first branch pipe 16b.

[0047] This is for the following reason. That is, at the branching portion 15, the flow of increased internal pressure that flows back from the downstream pipe 16a flows mostly into the first branch pipe 16b, which is linearly aligned along the downstream pipe 16a, and a small amount flows into the second branch pipe 16c, which is perpendicular to the downstream pipe 16a. The backflow that flows mostly into the first branch pipe 16b collides with the end wall located at the upstream end of the first branch pipe 16b, is changed in direction, and rises toward the top of the riser pipe 20, making it easy to release the pressure by the pressure release means 30 provided at the upper end of the riser pipe 20. In short, by providing the pressure release means 30 in the riser pipe 20 located at the most upstream portion of the first branch pipe 16b, the internal pressure of the piping main body 10 can be released most efficiently.

[0048] For the exhaust pressure piping 1a configured as described above, a pressure relief device 30 was installed in the riser pipe 20 at a predetermined position, and an experiment was conducted to determine whether a seal failure would occur in the seal trap connected to the riser pipe 20 by increasing the internal pressure of the piping main body 10a. The piping, backflow generator 50, and other equipment used in the experiment were the same as those in the experimental building in Example 1. As shown in Figure 5, the installation positions of the riser pipe 20 are as follows: A2 is the branching section 15; B2 is the bend 4 m upstream of the first branch pipe 16b from A2; C2 is the point 2 m upstream of the first branch pipe 16b from B2; and D2 is the upstream end of the first branch pipe 16b 2 m upstream of the first branch pipe 16b from C2. Furthermore, E2 is the bend 2 m upstream of the second branch pipe 16c from A2; and F2 is the upstream end of the second branch pipe 16c 2 m upstream of E2.

[0049] In this embodiment, a first water seal trap 51a (trap A) is connected to the riser pipe 20 installed at installation position F2, and a second water seal trap 51b (trap B) is installed to the riser pipe 20 installed at installation position D2. The experimental results are shown in Table 2 below.

[0050] [Table 2]

[0051] As shown in Table 2, when the pressure release lid (pressure release means 30) was not installed (No. 1), all of the water in both trap A and trap B splashed out.

[0052] When the pressure release lid was installed on the riser pipe 20 at installation position A2 (NO2), all the water splashed out of trap B, but only 1 mm of water splashed out of trap A. This is thought to be because the pressure was dispersed to the pressure release lid at installation position A2, and the backflow of the pressure rise flowing toward the second branch pipe 16c was small to begin with, so the pressure rise in trap A was reduced.

[0053] When the pressure release lid was installed on the riser pipe 20 at installation position B2 (NO3), the amount of water splashing out of trap A was 2 mm, and the amount of water splashing out of trap B was 1 mm, preventing seal failure. This is thought to be because the pressure release means 30 was installed in the first branch pipe 16b, where a large amount of the backflow of rising internal pressure flowed back from the downstream pipe 16a, and because the backflow of rising pressure collided with the wall of the bent section, causing some of it to flow upward, which allowed the pressure inside the pipe to be released through the pressure release lid.

[0054] When the pressure release lid was installed on the riser pipe 20 at installation position C2 (NO4), the amount of water splashing out of trap A was 2 mm, and the amount of water splashing out of trap B was 2 mm, preventing seal failure. This is thought to be because the pressure release means 30 was installed in the first branch pipe 16b, where a large amount of the internal pressure rise flowing back from the downstream pipe 16a flows, and the pressure inside the pipe was released from the pressure release lid. Compared to B2, the amount of water splashing out of trap B was greater because there was no collision of the backflow of pressure rise against the wall surface of the bent section.

[0055] When the pressure release lid was installed on the riser pipe 20 at installation position D2 (NO5), the amount of water splashing out of trap A was 1 mm and the amount of water splashing out of trap B was 0 mm, the smallest amount of splashing out, and seal failure was prevented. This is thought to be because the pressure release means 30 was installed in the first branch pipe 16b, where a large amount of the internal pressure rise flowing back from the downstream pipe 16a flows, and because the backflow of the pressure rise collided with the wall of the most upstream part of the first branch pipe 16b and flowed upward, allowing most of the pressure inside the pipe to be released from the pressure release lid.

[0056] When a pressure release lid was installed on the riser pipe 20 at installation position E2 (NO6), all of the water splashed out of Trap B, but only 2 mm of water splashed out of Trap A. This is thought to be because the pressure at branch 15 was dispersed to the pressure release lid, and the backflow of pressure rise flowing to the second branch pipe 16c was small to begin with, and the pressure release lid was installed, so the pressure rise in Trap A was reduced. On the other hand, the backflow of pressure rise flowing to the first branch pipe 16b was large, and because a pressure release lid was not installed, all of the water splashed out of Trap B.

[0057] When a pressure release lid was installed on the riser pipe 20 at installation position F2 (NO7), all of the water splashed out of Trap B, but the amount of water splashing out of Trap A was 0 mm. This is thought to be because the pressure was dispersed to the pressure release lid at branch 15, the backflow of pressure rise flowing to the second branch pipe 16c was small to begin with, and the pressure release lid was installed at the most upstream part of second branch pipe 16c, so the pressure rise in Trap A was significantly reduced. On the other hand, the backflow of pressure rise flowing to the first branch pipe 16b was large, but because a pressure release lid was not installed, all of the water splashed out of Trap B.

[0058] From the above results, it was found that in the piping main body 10a of Example 2, the internal pressure of the piping main body 10a can be most efficiently relieved by installing the pressure relief device 30 in the riser pipe 20 at the most upstream portion of the first branch pipe 16b. That is, with the pressure relief piping 1a of this Example, most of the pressure built up in the piping hits the end wall (opposing end wall portion 13) at the most upstream portion of the first branch pipe 16b, rises within the riser pipe 20, and flows toward the pressure relief device 30 installed at the upper end of the riser pipe 20. This facilitates the operation of the pressure relief device 30, allowing the pressure in the piping main body 10a to be efficiently relieved to the outside. In other words, when the flow path branches, providing the pressure relief device 30 in the first branch pipe 16b, where most of the backflow flows, allows the internal pressure to be efficiently relieved without providing the pressure relief device 30 in the second branch pipe 16c. Therefore, a small number of pressure release means 30 (one at the upstream end of the first branch pipe 16b) can suppress an increase in the internal pressure of the piping main body 10a, and can efficiently prevent water seal failure in the plumbing within the house 2. In addition, it is no longer necessary to provide a pressure release lid on the most downstream riser pipe 23, which was conventionally provided with a pressure release lid. [Example]

[0059] Next, a pressure exhaust pipe 1b according to a third embodiment of the present invention will be described in detail with reference to the drawings. As shown in Fig. 6, the pressure exhaust pipe 1b according to this embodiment has a pipe main body 10b that branches from the downstream side toward the upstream side and is disposed so as to surround the house 2 from three sides. Specifically, the pipe main body 10b includes a branching portion 17, a downstream pipe 18a, and a first branch pipe 18b and a second branch pipe 18c that branch off from the downstream pipe 18a in different directions.

[0060] Branching section 17 is configured as a T-shaped branch pipe, and pipes are connected to both upper left and right ends and the lower end of the T. Downstream pipe 18a is located downstream of pipe main body 10b and is a pipe connected to sewer pipe 3. Downstream pipe 18a is connected to the lower end of branching section 17.

[0061] First branch pipe 18b is one of the branch pipes branching off from downstream pipe 18a toward the upstream side, and is connected to one end of the T-shape of branching section 17 in the left-right direction. In other words, first branch pipe 18b branches off from branching section 17 in a direction intersecting downstream pipe 18a (in the present embodiment, a direction perpendicular to the direction of branching section 17). First branch pipe 18b has an L-shape in plan view and extends along two sides of house 2. Standpipes 20 are provided in two locations: at the bent portion of the L-shape of first branch pipe 18b, and at the upstream end of the straight portion extending upstream from the bent portion.

[0062] The second branch pipe 18c is the other of the branch pipes branching upstream from the downstream pipe 18a and is connected to the other left-right end of the T-shaped branch portion 17. In other words, the second branch pipe 18c branches in a direction intersecting the downstream pipe 18a (in this embodiment, perpendicular to the direction). The base end of the second branch pipe 18c is linearly connected to the base end of the first branch pipe 18b, and the first branch pipe 18b and the second branch pipe 18c branch symmetrically with respect to the downstream pipe 18a. The second branch pipe 18c has an L-shape in plan view and extends along two sides of the house 2. The riser pipes 20 are provided at two locations: the L-shaped bend of the second branch pipe 18c and the upstream end of the linear portion extending upstream from the bend.

[0063] The pressure release means 30 is configured as a pressure release lid similar to that in the first embodiment. The pressure release means 30 is installed in the riser pipe 20, among the multiple riser pipes 20, 20..., that is located in the pressure rise generation section 12. In this embodiment, the end wall located at the upstream end of the first branch pipe 18b and the end wall located at the upstream end of the second branch pipe 18c face the backflow of internal pressure, and both end walls are defined as the opposed end wall section 13, and the upstream end of the first branch pipe 18b and the upstream end of the second branch pipe 18c are defined as the pressure rise generation section 12, respectively. The pressure release means 30 is installed in the riser pipes 20 provided at the upstream end of the first branch pipe 18b and the upstream end of the second branch pipe 18c, respectively.

[0064] This is for the following reason. Specifically, the flow of increased internal pressure that flows back from the downstream pipe 18a is evenly separated into the first branch pipe 18b and the second branch pipe 18c at the branching section 17. The backflow that flows into the first branch pipe 18b collides with the end wall located at the upstream end of the first branch pipe 18b, is redirected, and rises toward the riser pipe 20 at that point, making it easier to open the pressure relief means 30 provided at the upper end of the riser pipe 20. The backflow that flows into the second branch pipe 18c collides with the end wall located at the upstream end of the second branch pipe 18c, is redirected, and rises toward the riser pipe 20 at that point, making it easier to release the pressure relief means 30 provided at the upper end of the riser pipe 20. For this reason, providing pressure relief means 30 at both the upstream end of the first branch pipe 18b and the upstream end of the second branch pipe 18c enables the internal pressure of the piping main body 10 to be most efficiently relieved.

[0065] For the exhaust pressure piping 1b configured as described above, a pressure relief device 30 was installed in the riser pipe 20 at a predetermined position, and an experiment was conducted to determine whether a seal failure would occur in the seal trap connected to the riser pipe 20 by increasing the internal pressure of the piping main body 10a. The piping, backflow generator 50, and other equipment used in the experiment were the same as those in the experimental building in Example 1. As shown in Figure 7 , the installation positions of the riser pipe 20 are as follows: A3 is the branching section 17; B3 is the bend 2 m upstream of the first branch pipe 16b from A3; and C3 is the upstream end of the first branch pipe 18b 2 m upstream of B3. Furthermore, D3 is the bend 4 m upstream of the second branch pipe 18c from A3; and E3 is the upstream end of the second branch pipe 16c 4 m upstream of D3 from D3.

[0066] In this embodiment, a first water seal trap 51a (trap A) is connected to the riser pipe 20 installed at installation position C3, and a second water seal trap 51b (trap B) is installed to the riser pipe 20 installed at installation position E3. The experimental results are shown in Table 3 below.

[0067] [Table 3]

[0068] As shown in Table 3, when the pressure release lid (pressure release means 30) was not installed (No. 1), all of the water in both trap A and trap B splashed out.

[0069] When the pressure release lid was installed on the riser pipe 20 at installation position A3 (NO2), all of the water inside the trap splashed out from both trap A and trap B. This is thought to be because, even at installation position A3, the backflow pressure is dispersed toward the riser pipe 20, but most of the pressure flows into the first branch pipe 18b and the second branch pipe 18c, causing splashing in trap A and trap B.

[0070] When the pressure release lid was installed on the riser pipe 20 at installation position B3 (NO3), the amount of water splashing out of trap A was 3 mm, but all of the water splashed out of trap B. This is thought to be because the backflow that flowed from the branching section 17 into the first branch pipe 18b was exhausted from the pressure release lid, preventing splashing out of trap A, but the backflow that flowed into the second branch pipe 18c could not escape to the outside because there was no pressure release lid on second branch pipe 18c, causing splashing out of trap B.

[0071] When a pressure release lid was installed on the riser pipe 20 at installation position C3 (NO4), the amount of water splashing out of trap A was 2 mm, but all of the water splashed out of trap B. This is thought to be because the backflow that flowed from the branch 17 into the first branch pipe 18b was released from the pressure release lid, preventing splashing out of trap A, but the backflow that flowed into the second branch pipe 18c could not escape to the outside because there was no pressure release lid on second branch pipe 18c, causing splashing out of trap B. Because C3 is the upstream end of the first branch pipe 18b, internal pressure was released efficiently, and the amount of splashing out was less than when a pressure release lid was installed at B3 (NO3).

[0072] When a pressure release lid was installed on the riser pipe 20 at installation position D3 (NO5), all of the water splashed out of trap A, but the amount of water splashing out of trap B was 2 mm. This is thought to be because the backflow that flowed from the branch 17 into the second branch pipe 18c was exhausted from the pressure release lid, preventing splashing out of trap B, but the backflow that flowed into the first branch pipe 18b could not escape to the outside because there was no pressure release lid on first branch pipe 18b, causing splashing out of trap A.

[0073] When a pressure release lid was installed on the riser pipe 20 at installation position E3 (NO6), all of the water splashed out of trap A, but the amount of water splashing out of trap B was 4 mm. This is thought to be because the backflow that flowed from the branch 17 into the second branch pipe 18c was exhausted from the pressure release lid, preventing splashing out of trap B, but the backflow that flowed into the first branch pipe 18b could not escape to the outside because there was no pressure release lid on first branch pipe 18b, causing splashing out of trap A.

[0074] When pressure release covers were installed on the riser pipe 20 at installation positions C3 and E3 (NO7), the amount of water splashing out of trap A was 0 mm, and the amount of water splashing out of trap B was 7 mm, preventing seal failure. This is thought to be because pressure release covers were installed on the first branch pipe 18b and the second branch pipe 18c, respectively, and the increased internal pressure in each of the first branch pipe 18b and the second branch pipe 18c was released through the pressure release covers, preventing trap B from splashing out. C3 is the upstream end of the first branch pipe 18b, and E3 is the upstream end of the second branch pipe 18c, so internal pressure is efficiently released in both cases, resulting in less splashing out than when pressure release covers were installed at B3 and D3 (NO8), which will be described later.

[0075] When pressure release covers were installed on the riser pipe 20 at installation positions B3 and D3 (No. 8), the amount of water splashing out of trap A was 1 mm, and the amount of water splashing out of trap B was 9 mm, preventing seal failure. This is thought to be because pressure release covers were installed on the first branch pipe 18b and the second branch pipe 18c, respectively. The increased internal pressure in each of the first branch pipe 18b and the second branch pipe 18c was released through the pressure release covers, preventing water splashing out of trap B. Although B3 and D3 are not located at the upstream end of the branch pipe, they are located at bends. Therefore, the backflow of pressure-rising water collides with the wall of the bend, causing some of it to flow upward. This reduces the amount of water splashing out of the traps compared to when pressure release covers are installed on straight sections.

[0076] From the above results, it was found that in the piping main body 10b of Example 3, the internal pressure of the piping main body 10b can be most efficiently relieved by providing pressure relief devices 30 in both the riser pipe 20 at the most upstream portion of the first branch pipe 18b and the riser pipe 20 at the most upstream portion of the second branch pipe 18c. That is, with the pressure relief piping 1b of this example, the pressure increased within the piping is evenly separated at the branch section 17, but one backflow hits the end wall (opposing end wall 13) at the most upstream portion of the first branch pipe 18b and rises within the riser pipe 20, so flows toward the pressure relief device 30 installed at the upper end of the riser pipe 20. Furthermore, the other backflow hits the end wall (opposing end wall 13) at the most upstream portion of the second branch pipe 18c and rises within the riser pipe 20, so flows toward the pressure relief device 30 installed at the upper end of the riser pipe 20. This makes it easier for each pressure release means 30 to operate, allowing the pressure in both the first branch pipe 18b and the second branch pipe 18c to be efficiently released to the outside. Therefore, with a small number of pressure release means 30 (two at the upstream end of the first branch pipe 18b and the upstream end of the second branch pipe 18c), it is possible to suppress an increase in the internal pressure of the piping main body 10b, and efficiently prevent water seal failure in the plumbing within the house 2. In addition, it is no longer necessary to provide a pressure release lid on the most downstream riser pipe 23, which was previously provided with a pressure release lid.

[0077] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described Examples 1 to 3, and appropriate design changes are possible within the scope of the gist of the present invention. In the above-described Examples 1 to 3, the drainage pipes connected to the plumbing facilities of the house 2 are given as examples, but it goes without saying that the present invention can also be applied to buildings and structures other than houses.

[0078] In the above embodiment, one lifting section 33 of the pressure release means 30 is provided in the center of the lid, but this is not limited to this. The lifting section may be offset from the center of the lid. Alternatively, the lid may have multiple lifting sections, or the lid itself may rise a predetermined distance to release pressure from the lid and lid frame.

[0079] The pressure release means may be a pressure relief structure that releases not only air but also backflowing wastewater. For example, it may be a two-stage pressure relief structure in which an air release mechanism (lifting / lowering part 33 of pressure release means 30) provided in the center of the lid releases the pressure in the piping, and the lid rises in response to the backflowing wastewater pressure, draining the wastewater between the lid and the lid frame, thereby releasing the pressure in the piping.

[0080] In the above embodiment, the end wall of the upstream portion of the piping main body 10 is referred to as the "opposing end wall portion," but this is not limited thereto. As shown in FIG. 8, a check valve 60 may be provided upstream of the lower portion of the riser pipe 20 provided midway through the piping main body 10, and serve as the opposing end wall portion. The check valve 60 is installed so that it opens when wastewater flows forward (in the direction of flowing downward in the water gradient) (see FIG. 8(a)) and closes when wastewater flows in the reverse direction (see FIG. 8(b)). As shown in FIG. 8(b), the check valve 60 closes when wastewater backflows, thereby closing the upstream side of the piping main body 10. As a result, the check valve 60 itself serves as a wall, serving as the opposing end wall portion opposing the backflow, and the portion where the check valve 60 is provided becomes a pressure rise generating portion. A pressure release means 30 is installed at the upper end of the riser pipe 20 where the check valve 60 is installed, and a cover member 21 is installed at the upper end of the other riser pipes 20.

[0081] In this configuration, when a backflow occurs in the piping main body 10, the check valve closes, and the backflow of internal pressure collides with the check valve 60, is redirected, and rises toward the top of the riser pipe 20. This opens the pressure release means 30 provided at the upper end of the riser pipe 20, and the pressure is exhausted.

[0082] The shape of the piping main body 10 and the installation position of the riser pipe 20 in the above-mentioned Example 1 are merely examples and are not limited to the above-mentioned configurations. The shape of the piping main body 10 and the installation position of the riser pipe 20 are determined appropriately depending on the shape of the building to which it is connected and the location of the plumbing.

[0083] In the second and third embodiments, the branch sections 15 and 17 are T-shaped branch pipes, but branch pipes of other shapes, such as Y-shape, may also be used. [Example]

[0084] Next, a riser pipe lid unit according to a fourth embodiment of the present invention will be described with reference to FIGS. 9 to 16. FIG. 9(a) is a plan view showing a state in which a lid member is attached to the upper end of a riser pipe, and FIG. 9(b) is a cross-sectional view taken along line AA of FIG. 10(a) is a plan view showing a state in which a pressure release lid is attached to the upper end of a riser pipe, and FIG. 10(b) is a cross-sectional view taken along line BB of FIG. 11(a) is a plan view showing a lid mounting adapter, and FIG. 11(b) is a cross-sectional view taken along line CC of FIG. 12(a) and (b) are diagrams showing a method for mounting a pressure release lid to the upper end of a riser pipe using a lid mounting adapter. FIG. 13(a) is a plan view showing a state in which a pressure release lid is attached to the upper end of a riser pipe using a lid mounting adapter, and FIG. 13(b) is a cross-sectional view taken along line DD of FIG. 14(a) to (c) are diagrams for explaining the types of outer frame parts. Figure 15(a) is a plan view showing a state in which a pressure release lid is attached to the upper end of a Type B riser pipe using a lid attachment adapter, and (b) is an E-E cross-sectional view of (a). Figure 16(a) and (b) are diagrams showing a method of attaching a pressure release lid to the upper end of a Type C riser pipe using a lid attachment adapter.

[0085] [Rise pipe cover unit] The exhaust pressure piping 1 described in Examples 1 to 3 is configured by installing a pressure release means 30 in the most upstream riser pipe 20 located in the pressure rise occurrence section 12 among multiple riser pipes 20, 20, etc. rising upward from the piping main body 10 laid in a residential area (see Figure 1). However, for example, when the drainage piping 11 is first laid, a cover member 21 is provided on the upper end of the most upstream riser pipe 20 of the drainage piping 11, and the exhaust pressure piping 1 described in Examples 1 to 3 can be configured by replacing this cover member 21 with a pressure release cover 30A (pressure release means 30).

[0086] In addition, in the above-mentioned Examples 1 to 3, the pressure release lid was provided with an outer frame portion 31, an inner frame portion 32, and a lifting portion 33, but the replacement pressure release lid 30A in this example is provided with an inner frame portion 32 and a lifting portion 33, excluding the outer frame portion 31.

[0087] Specifically, as shown in FIGS. 9(a) and 9(b), an outer frame 31 is airtightly fixed to the upper end of a riser pipe 20 at the most upstream portion of an existing drainage pipe. The outer frame 31 is formed cylindrically, and the lower surface of a downward step 44 formed on the outer peripheral surface as a supported portion is supported by the upper end of the riser pipe 20, thereby attaching the outer frame 31 along the periphery of the upper opening of the riser pipe 20. The lid member 21 is placed on an outer frame-side lid receiving portion 34A consisting of a step 34 having a circular annular shape in plan view formed on the inner peripheral surface of the outer frame 31, thereby closing an opening (inspection hatch) formed by the inner peripheral surface of the outer frame 31 at the upper end of the riser pipe 20 with the lid member 21. The step 34 constituting the outer frame-side lid receiving portion 34A has a horizontal surface and a vertical surface erected on the periphery of the horizontal surface.

[0088] Incidentally, a plurality of (e.g., three) recesses 22 are formed at predetermined intervals on the outer peripheral surface of the lid member 21, and the lid member 21 can be easily opened by inserting a tool or the like into the recesses 22 and operating the tool in a lever-like manner. Also, a gap S between the inner peripheral surface of the outer-frame-side lid body receiving portion 34A of the outer frame portion 31 and the outer peripheral surface of the lid member 21 is of a predetermined size (e.g., the radial dimension of the gap S is less than approximately 3 mm).

[0089] For example, if the owner of a detached house 2 wishes to change the existing drainage piping to the exhaust pressure piping 1 described in Examples 1 to 3, the change to the exhaust pressure piping 1 can be accommodated by replacing the cover member 21 attached to the upper end of the riser pipe 20 at the most upstream part of the existing drainage piping with a pressure release cover 30A.

[0090] However, since clients and the like often have little interest in information about existing lids (e.g., size, manufacturer, etc.), as shown in Figures 10(a) and (b), if, for example, the outer diameter dimension L1 of the lid member 21 attached to the existing riser pipe 20 is different from the outer diameter dimension L2 of the newly prepared pressure release lid 30A, the new pressure release lid 30A cannot be properly attached because it does not match the shape (e.g., inner surface shape, etc.) of the outer frame side lid receiving portion 34A, which is circular in plan view and formed on the outer frame portion 31 attached to the upper end of the riser pipe 20, or the sizes of the inner diameter dimension Ld and opening diameter dimension Ld', etc.

[0091] In detail, as shown in Figures 9(a) and (b), when the lid member 21 is attached, the inner diameter dimension Ld of the outer frame side lid body receiving portion 34A of the outer frame portion 31 is larger than the outer diameter dimension L1 of the lid member 21, so the lid member 21 can be fitted into the outer frame side lid body receiving portion 34A, and since the opening diameter dimension Ld' (diameter of the opening (inspection hatch)) of the outer frame side lid body receiving portion 34A is smaller than the outer diameter dimension L1 of the lid member 21 (Ld>L1>Ld'), the load of the pressure release lid 30A and the external force (pressure) acting on the pressure release lid 30A are adequately supported by the outer frame side lid body receiving portion 34A.

[0092] 10(a) and 10(b), when the pressure release lid 30A is installed, the outer diameter L2 of the pressure release lid 30A is smaller than the outer diameter L1 of the existing lid member 21 (L1 > L2). This causes a large gap S between the inner circumferential surface of the outer frame-side lid support portion 34A of the outer frame 31 and the outer circumferential surface of the pressure release lid 30A (e.g., the radial dimension of the gap S is approximately 3 mm or more). If the pressure release lid 30A is misaligned from the center of the opening (inspection hatch), a large gap S may occur in some areas. Such a large gap S causes the pressure release lid 30A to become unsteady, making it impossible to install the pressure release lid 30A horizontally. This may affect the operation of the pressure release lid 30A during pressure release and potentially compromise its performance. Furthermore, rainwater, soil, sand, pebbles, and debris may easily enter the gap S, potentially contaminating the inside of the piping main body 10 or causing drainage blockages.

[0093] Furthermore, because the inner diameter Ld of the outer-frame-side lid receiving portion 34A of the outer frame 31 is larger than the outer diameter L2 of the pressure release lid 30A, the pressure release lid 30A can be fitted into the outer-frame-side lid receiving portion 34A. However, although the opening diameter Ld' (diameter of the opening (inspection hatch)) of the outer-frame-side lid receiving portion 34A is smaller than the outer diameter L2 of the pressure release lid 30A (Ld > L2 > Ld'), the difference is extremely small, and the area where the outer-frame-side lid receiving portion 34A supports the pressure release lid 30A is small. As a result, the pressure release lid 30A cannot adequately support the weight of the pressure release lid 30A or external forces acting on it. Furthermore, because the sealant 36 does not contact the inner circumferential surface of the outer frame 31, it is difficult to achieve an airtight seal. Furthermore, a loss of airtightness can allow dirt and rainwater accumulated in the gap S to enter, or odors from the exhaust pressure piping 1 to leak into the outside air.

[0094] Thus, if an attempt is made to attach a pressure release lid 30A that does not fit the shape or size of the outer frame-side lid receiving part 34A of the outer frame part 31, a gap will form between the outer frame-side lid receiving part 34A and the pressure release lid 30A, or the pressure release lid 30A will become loose, making it impossible to attach the pressure release lid 30A properly. Therefore, by using a lid attachment adapter 70 described below, it becomes possible to attach a pressure release lid 30A that does not fit the shape or size of the outer frame-side lid receiving part 34A to the outer frame part 31.

[0095] [Lid mounting adapter] 11(a) and 11(b), lid mounting adapter 70 is attachable to outer frame 31 provided at the upper end of riser pipe 20 and is configured to support a replacement pressure release lid 30A. Furthermore, when molded into a thin-walled shape, lid mounting adapter 70 is made of a highly weather-resistant material (e.g., ASA resin, AES resin, polycarbonate resin, etc.) that has good fluidity and moldability and is capable of bonding with PVC resin, which is the material of outer frame 31, etc. Lid mounting adapter 70 is integrally molded with first flange 71 supported by outer frame-side lid receiving portion 34A of outer frame 31, second flange 72 supporting pressure release lid 30A (lid), and first and second hanging portions 73 and 74 extending downward. Lid receiving portion 75, which is generally annular in plan view, is formed by first hanging portion 73 and second flange 72.

[0096] First flange portion 71 is a plate-like portion having a generally annular shape in plan view, and extends generally horizontally outward from the upper end of first hanging portion 73. Second flange portion 72 is a plate-like portion having a generally annular shape in plan view, and extends generally horizontally inward from the lower end of first hanging portion 73. First hanging portion 73 is a cylindrical portion that connects first flange portion 71 and second flange portion 72, and the inner circumferential surface is formed so as to slope slightly inward from the upper end downward. Second hanging portion 74 is a cylindrical portion that extends downward from the inner circumferential edge of second flange portion 72.

[0097] The outer diameter LA of the lid mounting adapter 70 is approximately the same as the outer diameter LD of the outer frame 31, allowing the first flange 71 to be placed on the upper end surface of the outer frame 31 (LD = LA). The inner diameter La of the lid receiving portion 75 is slightly larger than the outer diameter L2 of the replacement pressure release lid 30A, allowing the pressure release lid 30A to fit, but preventing a large gap S between the outer peripheral surface of the pressure release lid 30A and the inner peripheral surface of the first hanging portion 73 (for example, the radial dimension of the gap S is less than approximately 3 mm). The opening diameter La' of the lid receiving portion 75 is smaller than the outer diameter L2 of the pressure release lid 30A, allowing the pressure release lid 30A to be supported by the lid receiving portion 75 (La > L2 > La').

[0098] Additionally, first hanging portion 73 and second flange portion 72 are formed so as to be insertable into outer frame-side lid body receiving portion 34A, and second hanging portion 74 is formed so as to be insertable into the opening of outer frame-side lid body receiving portion 34A. In other words, the portions of lid mounting adapter 70 other than first flange portion 71 are insertable into the interior of outer frame portion 31.

[0099] Furthermore, the vertical dimension Lh from the underside of the first flange portion 71 to the underside of the second flange portion 72 is shorter than the vertical dimension LH of the outer frame-side lid body receiving portion 34A of the outer frame portion 31 (LH>Lh). In this way, the lid mounting adapter 70 is formed with the first flange portion 71 so as to be supportable on the upper end portion of the riser pipe 20, and the outer frame-side lid body receiving portion 34A is formed to fit the pressure release lid 30A, which is a new lid to be replaced.

[0100] [Replacing the lid using the riser lid unit] Next, based on Figures 12 to 16, we will explain how to replace an existing lid member 21 with a pressure release lid 30A using a riser pipe lid unit consisting of a lid mounting adapter 70 configured as described above and a replacement pressure release lid 30A.

[0101] When replacing the lid member 21 attached to the upper end of the riser pipe 20 with the pressure release lid 30A, first remove the existing lid member 21 from the upper end of the riser pipe 20, and then attach the lid mounting adapter 70 from above to the upper end of the removed riser pipe 20.

[0102] 12(a), adhesive is applied to the outer surfaces of first flange portion 71 and first hanging portion 73 of lid mounting adapter 70, or to the upper end surface of outer frame portion 31 of riser pipe 20 and near the inner peripheral surface of outer frame-side lid body receiving portion 34A. Note that it is sufficient if the adhesive is applied to at least the outer surface of first flange portion 71 of lid mounting adapter 70 or the upper end surface of outer frame portion 31, but if the adhesive is also applied to the outer surface of first hanging portion 73 or the inner peripheral surface of outer frame-side lid body receiving portion 34A, it is preferable to apply it thickly.

[0103] 12(b), lid mounting adapter 70 is lowered so that first hanging portion 73 and second flange portion 72 are inserted into outer frame-side lid body receiving portion 34A, and first flange portion 71 is placed on the upper end surface of outer frame portion 31 with adhesive Z interposed therebetween. Then, due to the relationship LD=LA, the outer peripheral edge of lid mounting adapter 70 is aligned with the outer peripheral edge of outer frame portion 31, and the axes of lid mounting adapter 70 and outer frame portion 31 are aligned, thereby supporting lid mounting adapter 70 in the appropriate position relative to outer frame portion 31.

[0104] Furthermore, when the first flange portion 71 is placed on the upper end surface of the outer frame portion 31, the first hanging portion 73 is inserted into the outer frame side lid body receiving portion 34A, and when the outer surface of the first hanging portion 73 abuts the inner surface of the outer frame side lid body receiving portion 34A, the lid mounting adapter 70 is guided in the axial direction, making it easier to align the lid mounting adapter 70 with the outer frame portion 31.

[0105] Next, when the pressure release lid 30A is lowered from above the lid receiving portion 75 of the lid mounting adapter 70, the upper portion of the inner frame portion 32 is placed on the upper surface of the second flange portion 72 and is supported by the lid receiving portion 75, and the opening of the lid receiving portion 75 is closed by the pressure release lid 30A. In other words, the pressure release lid 30A is supported via the lid mounting adapter 70 attached to the outer frame portion 31 provided at the top of the riser pipe 20, and the upper end opening (inspection hatch) of the riser pipe 20 is closed by the lid mounting adapter 70 and the pressure release lid 30A.

[0106] As shown in Figures 13(a) and (b), when the pressure release lid 30A is supported on the lid body receiving portion 75 of the lid mounting adapter 70, the first flange portion 71 of the lid mounting adapter 70 is positioned close to the outer periphery of the pressure release lid 30A, so that the radial dimension of the gap S1 created between the inner surface of the lid body receiving portion 75 of the lid mounting adapter 70 and the outer periphery of the pressure release lid 30A is less than approximately 3 mm. On the other hand, when the pressure release lid 30A is placed on the second flange portion 72 and the sealing material 36 is pressed against the inner periphery of the cylindrical second hanging portion 74 extending downward from the inner periphery of the second flange portion 72, rattles occur in the pressure release lid 30A, making it impossible to install the pressure release lid 30A horizontally, and prevents rainwater, soil, sand, pebbles, garbage, etc. from entering the riser pipe 20 through the gap S1 and odors from the exhaust pressure piping 1 from leaking to the outside air.

[0107] Furthermore, first flange portion 71 extends from the upper end of first hanging portion 73 to the upper end face of outer frame portion 31, thereby closing the upper part of gap S2 that occurs between the outer peripheral surface of first hanging portion 73 and the inner peripheral surface of outer frame-side lid body receiving portion 34A, thereby preventing rainwater, soil, sand, pebbles, debris, and the like from entering riser pipe 20 through gap S2 and preventing odors from leaking to the outside air in exhaust pressure piping 1. Furthermore, the upper surface of first flange portion 71 and the upper surface of pressure release lid 30A are substantially flush with each other, preventing a step from occurring that could cause a tripping error or the pressure release lid 30A from unintentionally coming off.

[0108] Furthermore, as shown in Figures 14(a) to (c), there are multiple types of outer frame portions 31 fixed to the upper end of the riser pipe 20, with different shapes and sizes of the outer frame side lid receiving portion 34A and the like depending on the manufacturing date, manufacturer, etc.

[0109] 1 to 13, and is a Type A outer frame part in which the outer diameter dimension LD of the outer frame part 31 is 165 mm, the inner diameter dimension Ld of the outer frame-side lid body receiving part 34A is 149 mm, the opening diameter dimension Ld' of the outer frame-side lid body receiving part 34A is 135 mm, and the vertical dimension LH of the outer frame-side lid body receiving part 34A is 10 mm. The outer frame part 31B shown in Figure 14(b) is a Type B outer frame part in which the shape, inner diameter dimension Ld, and opening diameter dimension Ld' of the outer frame-side lid body receiving part 34A are different from the Type A outer frame part 31, and is a Type B outer frame part in which the outer diameter dimension LD of the outer frame part 31 is 165 mm, the inner diameter dimension Ld of the outer frame-side lid body receiving part 34A is 155 mm, the opening diameter dimension Ld' of the outer frame-side lid body receiving part 34A is 137 mm, and the vertical dimension LH of the outer frame-side lid body receiving part 34A is 10 mm. 14(c) is a type that differs from the A-type outer frame 31 in shape, inner diameter Ld, opening diameter Ld', and vertical dimension LH, and is a C-type outer frame with the outer diameter LD of the outer frame 31 being 165 mm, the inner diameter Ld of the outer-frame-side lid body receiving portion 34A being 155 mm, the opening diameter Ld' of the outer-frame-side lid body receiving portion 34A being 140 mm, and the vertical dimension LH of the outer-frame-side lid body receiving portion 34A being 8 mm. Note that the above is an example of an outer frame with a different shape and size, such as the outer-frame-side lid body receiving portion 34A, and other outer frame portions may be used.

[0110] Here, for example, when a type B outer frame portion 31C or a type C outer frame portion 31C is fixed to the upper end of an existing riser pipe 20, the inner diameter dimension Ld (Ld = 155 mm) of the outer frame side lid body receiving portion 34A of the type B outer frame portion 31B or the type C outer frame portion 31C is longer than the inner diameter dimension Ld (Ld = 149 mm) of the outer frame side lid body receiving portion 34A of the type A outer frame portion 31, so when attempting to attach the pressure release lid 30A shown in Figures 13(a) and (b), the gap S between the inner surface of the outer frame side lid body receiving portion 34A of the outer frame portion 31 and the outer surface of the pressure release lid 30A becomes even larger than the gap S described in Figures 10(a) and (b).

[0111] Therefore, when attaching a pressure release lid 30A to a type B outer frame portion 31B attached to an existing riser pipe 20, as shown in Figures 15(a) and (b), after attaching a lid mounting adapter 70 to the outer frame portion 31B, the pressure release lid 30A can be supported on the outer frame side lid body receiving portion 34A of the lid mounting adapter 70, thereby attaching the pressure release lid 30A together with the lid mounting adapter 70 to the outer frame portion 31B attached to the existing riser pipe 20.

[0112] Furthermore, when attaching a pressure release lid 30A to a C-type outer frame portion 31C attached to an existing riser pipe 20, as shown in Figures 16(a) and (b), after attaching a lid mounting adapter 70 to the outer frame portion 31C, the pressure release lid 30A can be supported on the outer frame side lid body receiving portion 34A of the lid mounting adapter 70, thereby attaching the pressure release lid 30A together with the lid mounting adapter 70 to the outer frame portion 31B attached to the existing riser pipe 20.

[0113] Furthermore, while the vertical dimension LH of the outer frame side lid receiving portion 34A of the type A outer frame portion 31 is 10 mm, the vertical dimension LH of the outer frame side lid receiving portion 34A of the type C outer frame portion 31C is 8 mm.As a result, as shown in Figure 16(a), a spacer 77 that is circular in plan view and has a vertical dimension of approximately 2 mm or more is attached to the upper end surface of the outer frame portion 31C with adhesive Z, and then the first flange portion 71 of the lid mounting adapter 70 is attached to the upper surface of the spacer 77 with adhesive Z, thereby preventing the second flange portion 72 from abutting the upper surface of the step portion 34.

[0114] [Actions and Effects] As described above, the riser pipe lid unit in Example 4 of the present invention comprises a lid mounting adapter 70 that is attached to the outer frame portions 31, 31B, 31C provided at the upper end of the riser pipe 20, and a pressure release lid 30A (lid body) that is supported via the lid mounting adapter 70.Therefore, regardless of the shape and size of the outer frame portions 31, 31B, 31C attached to the existing riser pipe 20, a new pressure release lid 30A of a different shape and size can be attached together with the lid mounting adapter 70.

[0115] Furthermore, the lid mounting adapter 70 is integrally formed with a first flange portion 71 supported by the outer frame portion 31, a second flange portion 72 supporting the pressure release lid 30A, and a first hanging portion 73 extending downward, so that the first hanging portion 73 is inserted into the upper opening of the riser pipe 20 and the first flange portion 71 is supported by the outer frame portion 31, thereby enabling the pressure release lid 30A to be supported by the second flange portion 72. In other words, the lid mounting adapter 70 only needs to be integrally formed with a frame-shaped supported portion (e.g., first flange portion 71) supported so as to fit along the upper opening of the outer frame portion 31, a lid receiving portion (e.g., second flange portion 72) capable of supporting the pressure release lid 30A so that the upper opening is closed, and an insertion portion (e.g., first hanging portion 73) that can be inserted into the upper opening of the riser pipe 20.

[0116] Furthermore, by applying a pressure release lid 30A having a pressure release means 30 capable of releasing the internal pressure in the exhaust pressure pipe 1 laid within the residential area to the outside of the exhaust pressure pipe 1 as the newly replaced lid, when the internal pressure in the exhaust pressure pipe 1 rises, air is discharged from the pressure release means 30 to the outside of the exhaust pressure pipe 1, making it possible to suppress the rise in internal pressure in the exhaust pressure pipe 1, and thus preventing the lid from coming off due to an increase in internal pressure.

[0117] Furthermore, the pressure release cover 30A can be installed on a riser pipe 20 located in a pressure rise generating section 12, among a plurality of riser pipes 20 installed in a piping main body 10 laid in a residential area, that has an opposing end wall 13 that faces the backflow of internal pressure built up inside the piping main body 10 (see FIG. 1). In this way, air pressurized inside the piping toward the pressure release means 30 installed in the riser pipe 20 located in the pressure rise generating section 12 hits the opposing end wall 13 and rises inside the riser pipe 20, making it easier for the pressure release means 30 to operate and efficiently releasing the pressure inside the pressure relief piping 1 to the outside. Therefore, a small number of pressure release means 30 can efficiently suppress seal water breakdown inside a building.

[0118] In this embodiment, an example has been given of a form in which the pressure release lid 30A is attached together with the lid mounting adapter 70 when replacing the lid member 21 attached to the upper end of the riser pipe 20 located in the pressure rise generation section 12 having the opposing end wall portion 13 (including the check valve 60) described in Examples 1 to 3 above. However, the present invention is not limited to this, and the pressure release lid 30A may be attached together with the lid mounting adapter 70 when replacing the lid member 21 attached to the upper end of at least one of the riser pipes 20 located in the pressure rise generation section 12 having the opposing end wall portion 13 described in Examples 1 to 3 above, that is, the riser pipe 20 other than the riser pipe 20 located in the most upstream portion of the piping main body 10, with the pressure release lid 30A.

[0119] Furthermore, in this embodiment, an example has been given in which the lid member 21 attached to the upper end of the riser pipe 20 is replaced with a pressure release lid 30A of a different size and type (e.g., whether or not it has a pressure release function), but the present invention is not limited to this. When replacing the lid member 21 attached to the upper end of the riser pipe 20 with another lid member 21 of the same type but a different size, the lid member 21 may be attached together with a lid mounting adapter 70. Furthermore, when replacing the pressure release lid 30A attached to the upper end of the riser pipe 20 with another pressure release lid 30A of the same type but a different size, the pressure release lid 30A may be attached together with a lid mounting adapter 70. Furthermore, when replacing the lid body attached to the upper end of the riser pipe 20 with a new lid body of the same size and type but a different shape (e.g., the shape in a plan view or the inner shape of the outer frame-side lid body receiving portion 34A), the new lid body may be attached together with a lid mounting adapter corresponding to the shape of the new lid body.

[0120] Furthermore, as shown in Figure 13(b), the upper surface of the second flange portion 72 is positioned lower than the lower surface of the first flange portion 71, so that the pressure release lid 30A can be positioned lower than the upper surface of the first flange portion 71 and installed so as not to protrude above the ground as much as possible.

[0121] Furthermore, since the first hanging portion 73 is formed in a circular ring shape when viewed in a plane, the first hanging portion 73 is inserted along the inner surface of the outer frame side lid body receiving portion 34A, and the pressure release lid 30A installed along this first hanging portion 73 can be supported at the center of the upper end opening of the riser pipe 20.

[0122] Furthermore, when the first flange portion 71 of the lid mounting adapter 70 is supported on the upper end surface of the outer frame portion 31, the lower portion of the lid mounting adapter 70, i.e., the first hanging portion 73, the second flange portion 72 and the second hanging portion 74, are spaced apart from the outer frame portion 31 and the riser pipe 20, and in particular, since the second flange portion 72, which supports the pressure release lid 30A from below, is not placed on the upper surface of the step portion 34, the only point of contact of the lid mounting adapter 70 with the outer frame portion 31 is the first flange portion 71, thereby preventing rattling of the lid mounting adapter 70.

[0123] Furthermore, by fixing the first flange portion 71 to the riser pipe 20 with adhesive Z, it is possible to prevent the pressure release lid 30A together with the lid mounting adapter 70 from coming off the riser pipe 20. Note that, although the first flange portion 71 of the lid mounting adapter 70 is fixed to the outer frame portion 31 with adhesive Z, a portion other than the first flange portion 71 may be fixed to the outer frame portion 31, or may be fixed directly to the riser pipe 20.

[0124] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0125] [Variation 1] Next, a lid mounting adapter as Modified Example 1 of the present invention will be described with reference to Figures 17 to 19. Figure 17(a) is a plan view showing the lid mounting adapter as Modified Example 1, and (b) is an FF cross-sectional view of (a). Figure 18(a) is a plan view showing a state in which a pressure release lid is attached to the outer frame of Type B together with the lid mounting adapter as Modified Example 1, and (b) is a GG cross-sectional view of (a). Figure 19 is a vertical cross-sectional view showing a state in which a pressure release lid is attached to the outer frame of Type C together with the lid mounting adapter as Modified Example 1.

[0126] As shown in FIGS. 17(a) and 17(b), lid mounting adapter 70A as Modification 1 is made of the same material as lid mounting adapter 70 described in Example 1 but has a different shape. First flange portion 71 extends outward from the upper end of first hanging portion 73, and its upper surface is formed with inclined surface 76 that slopes downward toward the outside. Second flange portion 72 is a plate-like portion that is generally annular in plan view and extends inward generally horizontally from a position slightly above the lower end of first hanging portion 73. First hanging portion 73 is a cylindrical portion that connects first flange portion 71 and second flange portion 72. Second hanging portion 74 is a cylindrical portion that extends downward from the inner periphery of second flange portion 72.

[0127] Even with the lid mounting adapter 70A configured as variant example 1 in this manner, it can be attached to the upper end of the B-type outer frame portion 31B as shown in Figures 18(a) and (b), or to the upper end of the C-type outer frame portion 31C as shown in Figures 19(a) and (b).Therefore, a new pressure release lid 30A can be attached together with the lid mounting adapter 70A regardless of the shape and size of the outer frame portions 31, 31B, 31C attached to the existing riser pipe 20.

[0128] Furthermore, the lid mounting adapter 70A as variant example 1 has a thicker upper and lower dimension of the first flange portion 71 than the lid mounting adapter 70 described in example example 1, thereby increasing its strength, while the vertical separation width L10 between the lower surface of the first flange portion 71 and the upper surface of the second flange portion 72 is smaller, so that the lid body receiving portion 75 is arranged to protrude further above the ground (GL).

[0129] Therefore, when the upper end of the outer frame 31 is flush or nearly flush with the ground (GL), the lid mounting adapter 70A has an inclined surface 76 that slopes downward outward from the inner periphery of the first flange 71, and even if the lid mounting adapter 70A is provided so that it protrudes from the ground due to the first flange 71 being supported by the outer frame 31, the formation of the inclined surface 76 that slopes downward outward on the upper surface of the lid mounting adapter 70A makes it difficult for a foot to hit the lid mounting adapter 70A, thereby preventing tripping. The inclination angle of the inclined surface 76 with respect to the ground is arbitrary, but a small angle is preferable.

[0130] [Variation 2] Next, a lid mounting adapter as Modified Example 2 of the present invention will be described with reference to Fig. 20. Fig. 20(a) is a plan view showing a state in which a pressure release lid is mounted on the outer frame of Type B together with a lid mounting adapter as Modified Example 2, and (b) is an HH cross-sectional view of (a).

[0131] 20(a) and 20(b), lid mounting adapter 70B as modified example 2 is made of the same material and has the same basic configuration as lid mounting adapter 70A described in modified example 1, but has locking means 80 provided at multiple locations (for example, two locations) in the circumferential direction on the underside of second flange portion 72. Locking means 80 is composed of elastically deformable elastic piece 80A extending downward from the underside of second flange portion 72, and locking portion 80B formed at the lower end of elastic piece 80A.

[0132] When attaching the lid mounting adapter 70B to the outer frame portion 31B, the elastic pieces 80A elastically deform inward, causing the locking means 80 to be inserted from above into the opening of the outer-frame-side lid receiving portion 34A. Then, when the first flange portion 71 is placed on the upper end surface of the outer frame portion 31B, the elastic restoring force of the elastic pieces 80A causes the locking portion 80B to lock into the downward step portion 31K formed on the inner circumferential surface of the outer frame portion 31B. This restricts the lid mounting adapter 70B from moving upward, making it possible to attach the lid mounting adapter 70B to the outer frame portion 31B without using adhesive Z or the like.

[0133] In this way, the lid mounting adapter 70B has a locking portion 80B that can be locked onto a downward step portion 31K formed on the inner surface of the outer frame portion 31B, and the locking portion 80B is locked onto the outer frame portion 31B, thereby preventing the lid mounting adapter 70B from coming off the riser pipe 20.Therefore, simply by supporting the lid mounting adapter 70B on the outer frame portion 31B, the lid mounting adapter 70B can be prevented from coming off the riser pipe 20.

[0134] Furthermore, the locking means 80 is housed inside the riser pipe 20 because the pressure release lid 30A is supported by the lid mounting adapter 70B, and it is difficult to release the locking state between the locking means 80B and the outer frame portion 31B unless the pressure release lid 30A is removed. In other words, when the pressure release lid 30A is supported, the locking state between the locking portion 80B and the step portion 31K cannot be easily released, so it is possible to prevent the lid mounting adapter 70C from accidentally coming off the riser pipe 20.

[0135] Furthermore, in this modified example, an example has been given of a form in which the lid mounting adapter 70B is attached to the outer frame portion 31B by engaging the lid mounting adapter 70B with the outer frame portion 31B using an elastically engageable engaging means 80, but the present invention is not limited to this, and for example, a so-called bayonet-structured engaging means may be applied in which multiple engaging pieces provided around the periphery of the lid mounting adapter 70B are rotated circumferentially relative to multiple engaging portions formed on the outer frame portion 31B, or an engaging means may be applied in which a male threaded portion provided on the outer peripheral surface of the lid mounting adapter 70B is threadedly engaged with a female threaded portion provided on the inner peripheral surface of the outer frame portion 31B, and various modifications are possible.

[0136] [Variation 3] Next, a lid mounting adapter as Modified Example 3 of the present invention will be described with reference to Fig. 21. Fig. 21(a) is a vertical cross-sectional view showing the state in which the pressure release lid is mounted to the outer frame together with the lid mounting adapter as Modified Example 3, and (b) is a vertical cross-sectional view showing the state in which the pressure release lid is mounted to the outer frame together with the lid mounting adapter.

[0137] As shown in Figures 21(a) and (b), the lid mounting adapter 70C as variant example 3 has the same material and basic configuration as the lid mounting adapters 70A and 70B described in variant examples 1 and 2, but the radial width dimension L11 of the first hanging portion 73, which forms the base of the first flange portion 71 and the second flange portion 72, is formed to be wider.

[0138] For example, if the types of outer frame parts are a 150 mm type outer frame part 31 (see Figure 9) in which the inner diameter dimension Ld of the outer frame side lid body receiving part 34A is 150 mm, and a 200 mm type outer frame part 31A (see Figure 21) in which the inner diameter dimension Ld of the outer frame side lid body receiving part 34A is 200 mm, it would be possible to prepare two types of pressure release lids 30A in advance, a 150 mm type and a 200 mm type, but the pressure release lids 30A have a more complex structure and are more expensive than the lid member 21.

[0139] Therefore, by attaching a 150mm type pressure release lid 30A to a 200mm type outer frame portion 31 together with a lid mounting adapter 70C as variant example 3, even if the outer frame portion 31 attached to the existing riser pipe 20 is of the 200mm type, a new 150mm type pressure release lid 30A can be attached together with the lid mounting adapter 70C, which has a simpler structure and is cheaper than the pressure release lid 30A, making it possible to replace the lid with a low-cost, high-performance lid body.

[0140] In addition, in this variant example 3, two types of outer frame parts, a 150 mm type and a 200 mm type, are exemplified, but new pressure release lids 30A of different types may be attached together with the lid mounting adapter 70C to accommodate three or more types of outer frame parts.

[0141] [Variation 4] Next, a lid mounting adapter as a fourth modified example of the present invention will be described with reference to Fig. 22. Fig. 22 is a vertical cross-sectional view showing a state in which a pressure release lid is attached to an A-type outer frame together with the lid mounting adapter as the fourth modified example.

[0142] 22, lid mounting adapter 70D as modification 4 is made of the same material and has the same basic configuration as lid mounting adapter 70C described in modification 3, but has a cylindrical reinforcing portion 90 protruding from the bottom of lid mounting adapter 70C. Reinforcing portion 90 is elastically deformable and is formed so as to incline downward toward the inner periphery of outer frame portion 31A, so that it abuts against the inner periphery of outer frame portion 31A when lid mounting adapter 70D is attached to outer frame portion 31A.

[0143] In this way, when the first flange portion 71 and the second flange portion 72 are arranged radially apart, by forming the reinforcing portion 90 at the bottom of the lid mounting adapter 70D, the second flange portion 72 is supported from below by the inner circumferential surface of the outer frame portion 31A via the reinforcing portion 90, so that when an external force is applied from above to the pressure release lid 30A, the external force is dispersed so as to spread downward along the inner circumferential surface of the outer frame portion 31A via the reinforcing portion 90, thereby suppressing deformation of the lid mounting adapter 70C. Note that the reinforcing portion 90 is not limited to being formed in a cylindrical shape, and multiple reinforcing portions 90 may be formed in the circumferential direction.

[0144] [Variation 5] Next, a lid mounting adapter as a fifth modified example of the present invention will be described with reference to Fig. 23. Fig. 23 is a vertical cross-sectional view showing a state in which a pressure release lid is attached to the outer frame of type B together with the lid mounting adapter as the fifth modified example.

[0145] In the above-mentioned Example 4 and Variations 1 to 4, when the lid mounting adapters 70, 70A to 70D are attached to the upper ends of the outer frame portions 31, 31A, 31B, the first flange portion 71 is placed on the upper end surfaces of the outer frame portions 31, 31A, 31B, but the present invention is not limited to this, and the first flange portion 71 may be placed on the upper surface of the step portion 34 that constitutes the outer frame side lid body receiving portion 34A of the outer frame portion 31, as in the lid mounting adapter 70E of Variation 5 shown in Figure 23.

[0146] In this case, first hanging portion 73, second flange portion 72, and second hanging portion 74 are inserted into the opening of outer frame-side lid receiving portion 34A of outer frame portion 31. Furthermore, by fitting first flange portion 71 into outer frame-side lid receiving portion 34A, the upper end surface of outer frame portion 31, the upper surface of pressure release lid 30A, and the upper surface of lid mounting adapter 70E become approximately flush, and therefore it becomes possible to provide pressure release lid 30A and lid mounting adapter 70E so that they do not protrude upward from the upper end surface of outer frame portion 31, that is, above ground level (GL).

[0147] [Variation 6] Next, a lid mounting adapter as Modified Example 6 of the present invention will be described with reference to Fig. 24. Fig. 24(a) is a plan view showing a state in which a pressure release lid is mounted on the outer frame of Type B together with a lid mounting adapter as Modified Example 6, and (b) is a cross-sectional view taken along line II of (a).

[0148] As shown in Figures 24(a) and (b), the lid mounting adapter 70F as variant 6 has the same material and basic configuration as the lid mounting adapters 70A to 70D described in variants 1 to 4, but the outer diameter dimension LA of the lid mounting adapter 70F is larger than the outer diameter dimension LD of the outer frame portion 31 (LA > LD), and the inner diameter dimension La of the lid body receiving portion 75 is formed to correspond to the pressure release lid 30A', which has an outer diameter dimension L3 larger than the outer diameter dimension L2 of the pressure release lid 30A, and is therefore larger than the inner diameter dimension Ld of the outer frame side lid body receiving portion 34A (La > Ld).

[0149] In other words, not only when a lid member 21 having an outer diameter dimension L1 that can fit into the outer frame side lid body receiving portion 34A of the outer frame portion 31B attached to an existing riser pipe 20 is replaced with a pressure release lid 30A having an outer diameter dimension L2 that is smaller than the lid member 21, as in the above-mentioned Example 4 and Variations 1 to 5, but also when a pressure release lid 30A' having a large outer diameter dimension L3 that cannot fit into the outer frame side lid body receiving portion 34A is replaced, the pressure release lid 30A' having the large outer diameter dimension L3 can be attached to the upper end of the outer frame portion 31B together with the lid mounting adapter 70F.

[0150] In addition, in this modified example, the second hanging portion 74 extending downward from the underside of the second flange portion 72 is inserted into the outer frame side lid body receiving portion 34A, and when the outer surface of the second hanging portion 74 abuts against the inner surface of the outer frame side lid body receiving portion 34A, the lid mounting adapter 70F is guided in the axial direction, making it easier to align the lid mounting adapter 70F with the outer frame portion 31B.

[0151] Furthermore, in the above embodiment, the lid member 21, the pressure release lid 30A and the lid mounting adapters 70, 70A to 70F were formed in a circular ring shape when viewed from above, but they may also be formed in a non-circular ring shape, such as a ring or rectangular frame shape, as long as they are formed in a frame shape when viewed from above corresponding to the shape of the outer frame side lid body receiving portion 34A of the outer frame portion 31, 31A to 31C when viewed from above. [Explanation of symbols]

[0152] 1 Exhaust pressure piping 2. Housing 3 Sewerage piping 10 Piping body 11 Drainage piping 12 Pressure increase occurrence part 13 Opposing end wall 15, 17 Branch 16a, 18a downstream pipe 16b, 18b First branch pipe 16c, 18c Second branch pipe 20, 23 Standpipe 21 Lid member (lid body) 22 recess 30 Pressure relief means 30A, 30A' Pressure Release Lid (Lid) 31, 31A~31C Outer frame (lid holder) 31K stepped section 32 Inner frame 33 Lifting section 34 Step part 34A Outer frame side lid receiving part 35 Tsuba 36 Sealing material 37 Slope section 38 Locking part 39 Lid plate 40 Shaft 41 Sealing material 43 Stopper 44 Step part 50 Backflow Generator 60 Check valve (opposing end wall) 70, 70A to 70F Lid mounting adapter 71 First flange 72 Second flange 73 1st hanging part (hanging part) 74 2nd hanging part (hanging part) 75 Lid receiving part 76 Slope 77 Spacer 80 Locking means 80A Elastic piece 80B Locking part S, S1, S2 gap Z adhesive

Claims

[Claim 1] a lid mounting adapter attached to a lid receiver provided at the upper end of the riser pipe; a lid body supported via the lid mounting adapter; The lid mounting adapter has a first flange portion that extends outward and is placed on the upper end surface of the lid receiver, and the lid body is a riser pipe lid unit in which the upper surface of the lid body is placed so that it is approximately flush with the upper surface of the first flange portion.

Images