Pipe fitting and drainage system

Abstract

To provide a pipe fitting and installation structure of the pipe fitting.SOLUTION: The pipe fitting of the present invention comprises a joint pipe body 26 having a vertical pipe connecting part 26A that can be connected to a vertical pipe 20 on an upstream side at one end and a horizontal branch pipe connecting part 27 that can be connected to a horizontal branch pipe 28 on a side surface, in which a plurality of protrusions are formed on an inner peripheral surface of a portion on a vertical pipe connecting part side and on the upstream side of the lateral branch pipe connecting part 27 at intervals in a circumferential direction in the joint pipe body 26.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pipe fitting and a drainage system. [Background technology]

[0002] In multi-story buildings such as apartment buildings, horizontal branch pipes are provided to introduce wastewater from sanitary equipment and other facilities in the rooms on each floor. These horizontal branch pipes are connected to vertical drainage pipes in the pipe shaft so that the wastewater can be diverted into the sewer system. A resin joint member called a drainage manifold is arranged at the portion where the drainage vertical pipe connected to the horizontal branch pipe penetrates the floor slab. Conventionally, this drainage manifold has an upper connecting pipe that connects the drainage vertical pipe, a horizontal branch pipe connection part formed on the side of the upper connecting pipe, and a lower connecting pipe that is connected to the lower end of the upper connecting pipe and passes vertically through the through hole in the floor slab.

[0003] Furthermore, as described in Patent Document 1 below, a drainage collecting pipe is known in which a backflow prevention rib extending in the pipe axial direction is provided on the inner surface of the joint pipe body, so that drainage that flows into the joint pipe body from a specific side branch pipe does not flow back into other side branch pipes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-085015 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present inventors have discovered that in a drainage collecting joint connecting a vertical drainage pipe and a horizontal branch pipe, when wastewater flows forcefully from the vertical drainage pipe into the inside of the drainage collecting joint, the wastewater flow may flow down inside the drainage collecting joint while forming a cylindrical water film. In this case, the wastewater flow becomes a cylindrical water film and passes through the connection with the horizontal branch pipe, blocking it, which may cause an obstruction to the wastewater flowing from the horizontal branch pipe to the drainage collecting joint. In some cases, the wastewater flow that flows from the vertical drain pipe to the drainage collecting joint may become the positive pressure side, and the wastewater flow that flows from the horizontal branch pipe to the drainage collecting joint may become the negative pressure side, which may cause a backflow of wastewater into the horizontal branch pipe.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a pipe fitting and a drainage system in which a protrusion creates a break in the flow of water flowing from a vertical pipe into the fitting pipe body, ensuring that water flows from the horizontal branch pipe into the fitting pipe body. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following aspects. (1) The pipe fitting of this embodiment comprises a fitting pipe body having at one end a vertical pipe connection portion connectable to an upstream vertical pipe and at a side thereof a horizontal branch pipe connection portion connectable to a horizontal branch pipe, and is characterized in that one or more protrusions are formed on the inner surface of the fitting pipe body on the side of the vertical pipe connection portion that is upstream of the horizontal branch pipe connection portion.

[0008] By providing one or more projections that protrude inwardly on the upstream side of the horizontal branch pipe connection part on the vertical pipe connection part side of the joint pipe body, a dividing part corresponding to a slit can be formed in the flow of water that flows from the vertical pipe to the joint pipe body side while forming a cylindrical water film. Water that attempts to flow into the joint pipe body via the horizontal branch pipe connection part can flow into the joint pipe body via this dividing part. Therefore, even if water flows forcefully from the vertical pipe into the joint pipe main body and creates a cylindrical water film inside the joint pipe main body, water can flow unimpeded from the side branch pipe into the joint pipe main body. This prevents the internal pressure in the joint pipe main body near the side branch pipe connection from becoming higher than necessary, and prevents water from flowing back from the joint pipe main body to the side branch pipe. If multiple protrusions are provided, it can accommodate a structure in which multiple lateral branch pipe connections are provided, and multiple divided sections equivalent to multiple cuts can be created in the water film, making it possible to introduce water in a structure in which water flows into the fitting body from multiple lateral branch pipes.

[0009] (2) The pipe fitting of this embodiment can have a ring-shaped adapter that can be freely attached to the portion of the fitting pipe body on the vertical pipe connection portion upstream of the horizontal branch pipe connection portion, and one or more protrusions can be formed on the inner surface of the adapter.

[0010] By providing one or more protrusions on the inner circumference of an adapter that can be attached to the vertical pipe connection portion of the joint pipe body, a protrusion can be provided on the vertical pipe connection portion of the joint pipe body without making any special improvements to the joint pipe body. When the joint pipe body is an integrally molded resin product, if a separate protrusion is provided on the joint pipe body, it may not be possible to provide the protrusion at the desired position due to the shape of the mold used for molding, restrictions on demolding, etc. However, by providing the protrusion on an adapter that is separate from the joint pipe body, it is possible to form the protrusion at the desired position without being bound by the restrictions that arise when forming a protrusion on the joint pipe body. If multiple protrusions are provided on the adapter, it can accommodate a structure in which multiple side branch pipe connections are provided, and multiple divided sections equivalent to multiple cuts can be created in the water film, making it possible to introduce water in a structure in which water flows into the fitting body from multiple side branch pipes.

[0011] (3) In the pipe joint according to this embodiment, it is preferable that the projection has a polygonal shape in a side view when viewed from the radially inside of the joint pipe body so that the projection is disposed at the front.

[0012] If the protrusion is polygonal when viewed from the side, the slopes of the protrusion that form the corners of the polygon can be utilized to reliably introduce a dividing portion into the water film caused by the flow of water flowing into the joint pipe body through the vertical pipe connection portion, allowing water to flow in from the horizontal branch pipe connection portion.

[0013] (4) In the pipe joint according to this embodiment, it is preferable that the joint pipe body is for use on the lowest floor of a multi-story building.

[0014] In many cases, wastewater from the upper floors flows vigorously into the joint pipe body installed on the lowest floor of a multi-story building, so a water film is likely to form due to the water flowing vigorously down the vertical pipe to the joint pipe body. As a result, the pressure inside the joint pipe body close to the horizontal branch pipe connection tends to become positive, increasing the risk of backflow to the horizontal branch pipe. However, by introducing a protrusion into the water film flowing from the vertical pipe connection to the joint pipe body, a structure can be provided that does not impede the flow of water from the horizontal branch pipe connection to the joint pipe body.

[0015] (5) In the pipe joint according to this embodiment, it is preferable that a straight pipe is connected to the other end side of the joint pipe body.

[0016] A straight pipe is connected to the joint pipe body installed on the lowest floor of a multi-story building. If this straight pipe is connected to a drainage channel, wastewater can flow through the straight pipe and be discharged into the drainage channel.

[0017] (6) The drainage system of this embodiment is characterized in that the pipe fitting described in any one of (1) to (5) is arranged with the vertical pipe connection portion on one end side connected to a first vertical pipe on the upstream side and the vertical pipe connection portion on the other end side connected to a second vertical pipe on the downstream side.

[0018] By providing one or more projections that protrude inwardly on the upstream side of the horizontal branch pipe connection part of the joint pipe body on the vertical pipe connection part side, a dividing part can be formed in the flow of water that flows from the vertical pipe to the joint pipe body side while forming a cylindrical water film. Water that attempts to flow into the joint pipe body via the horizontal branch pipe connection part can flow into the joint pipe body via this dividing part. Therefore, even if water flows forcefully from the first vertical pipe into the joint pipe main body and creates a cylindrical water film flowing down inside the joint pipe main body, water can be introduced into the joint pipe main body from the horizontal branch pipe without hindrance. Therefore, water can be introduced into the joint pipe main body without hindrance from both the vertical pipe connection part and the horizontal branch pipe connection part, and the water introduced into the joint pipe main body can be discharged to the second vertical pipe connected to the joint pipe main body. In addition, since the internal pressure within the joint pipe main body in the vicinity of the horizontal branch pipe connection portion can be prevented from becoming higher than necessary, the backflow of water from the joint pipe main body side to the horizontal branch pipe side can be prevented.

[0019] (7) In the drainage system according to this embodiment, a configuration can be adopted in which a horizontal main pipe connected to a sewer main pipe or a septic tank is connected to the other end of the joint pipe body.

[0020] In the drainage system of this embodiment, backflow into the horizontal branch pipe is prevented, while drainage from the vertical pipes and the horizontal branch pipe can be reliably introduced into the joint pipe body and drained into the horizontal main pipe, and the drainage can be reliably discharged through the horizontal main pipe into the main sewer pipe or septic tank. Effect of the Invention

[0021] According to the present invention, even if a water film is generated that flows in a cylindrical shape from the vertical pipe connection part toward the joint pipe body, the projection can form a divided part in the water film. Water that attempts to flow from the horizontal branch pipe connection part into the joint pipe body can flow into the joint pipe body through this divided part. This prevents the internal pressure within the joint pipe body in the vicinity of the lateral branch pipe connection from becoming higher than necessary, and prevents water from flowing back into the lateral branch pipe. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a side view of a drainage system equipped with a pipe joint of a first embodiment according to the present invention, showing a vertical pipe, a collecting joint, a horizontal branch pipe, and a horizontal main pipe as viewed from the side. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a plan view of a protrusion adapter incorporated in the pipe joint. [Figure 4] FIG. [Diagram 5] 11A and 11B are diagrams showing the relationship between the width and height of a protrusion formed on the adapter. [Figure 6]13A and 13B show examples of the adapter having a wing-shaped protrusion, where FIG. 13A is a perspective view showing a first example, and FIG. 13B is a perspective view showing a second example. [Figure 7] 11 shows examples of when the protrusion formed on the adapter is roof-shaped, where (a) is an oblique view showing a first example, (b) is an oblique view showing a second example, (c) is an oblique view showing a third example, and (d) is an oblique view showing a fourth example. [Figure 8] 13 is a perspective view showing an example in which the protrusion formed on the adapter is a triangular pyramid. FIG. [Figure 9] FIG. 13 is a plan view showing an adapter used in the examples and having four triangular pyramidal protrusions on the inner circumferential direction. [Figure 10] FIG. 13 is a plan view showing an adapter having four roof-shaped protrusions in the inner circumferential direction, used in the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, with reference to Figs. 1 to 4, an example of a case in which a pipe joint according to an embodiment of the present invention is applied to a drainage system of a building will be described. As shown in Fig. 1, the drainage system 10 of this embodiment is an example applied to a multi-story building (building) such as a high-rise apartment building, a commercial building, etc. In this type of building, wastewater discharged from sanitary equipment (drainage equipment) such as toilets, vanities, and sinks on each floor flows into a vertical main pipe 20 constituting a drainage channel through a horizontal branch pipe (not shown). As shown in Figure 1, the drainage system 10 comprises a vertical main pipe (first vertical pipe) 20, a collecting joint 21 connected to the lower end of the vertical main pipe 20, a lower connecting pipe (second vertical pipe: straight pipe) 22 connected to the lower end 9 of the collecting joint 21, a leg joint 23 connected in turn to the lower connecting pipe 22, and a horizontal main pipe 25.

[0024] The vertical main pipe 20 is installed so as to pass through each floor (floor slab). Wastewater from each drainage facility flows down along the vertical main pipe 20 to the lowest floor of the multi-story building, and flows into the horizontal main pipe 25 via a collective joint (pipe joint) 21 connected to the lower end of the vertical main pipe 20, a lower connecting pipe 22, and a leg joint 23, and is finally sent to the sewer main pipe, a septic tank, etc. The drainage system 10 discharges wastewater from the drainage facility on each floor to the outside of the building. The vertical main pipe 20 collects and guides the drainage water from the drainage equipment installed on each floor downward. The vertical main pipe 20 is equipped with a plurality of collective joints provided corresponding to each floor, and a first pipe (not shown) that connects the collective joints provided on adjacent floors in the vertical direction.

[0025] Of the multiple group joints, as shown in FIG. 1, a characteristic configuration of this embodiment, which will be described later, is applied to a group joint 21 for the lowest floor provided on the lowest floor of a building. The joint assembly 21 has a cylindrical joint pipe main body 26, the outer circumferential surface of which is formed with three branch pipe connection parts 27 around the periphery, and a horizontal branch pipe (horizontal pipe) 28 is connected to each of them. The horizontal branch pipe 28 guides wastewater discharged from the drainage equipment into the inside of the joint pipe main body 26 via the branch pipe connection part 27. A first vertical pipe connection part 26A is formed at the upper end of the joint pipe main body 26, and a second vertical pipe connection part 26B is formed at the lower end of the joint pipe main body 26.

[0026] The lower end of the vertical main pipe 20 is joined to the first vertical pipe connection part 26A of the joint pipe body 26 via an adapter 38, and a lower connecting pipe (straight pipe) 22 with a uniform inner diameter is connected to the second vertical pipe connection part 26B of the joint pipe body 26. A leg joint 23 is connected to the lower end of the lower connecting pipe 22. The leg joint 23 has socket parts 31 at both ends of a curved pipe part 30 that is L-shaped in side view.

[0027] The lower connecting pipe 22 is made of a resin composition containing, for example, polyvinyl chloride resin and thermally expandable graphite, which is a thermally expandable fire-resistant material. That is, the lower connecting pipe 22 is produced by extrusion molding a resin composition containing a thermally expandable fire-resistant material. By providing these heat-expandable fire-resistant materials, fire resistance can be achieved when the lower connecting pipe 22 is inserted through a through hole provided in the floor slab. As an example, a single-layer structure made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite relative to 100 parts by weight of polyvinyl chloride resin can be adopted. Alternatively, a three-layer structure made of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite relative to 100 parts by weight of polyvinyl chloride resin and a coating layer of a polyvinyl chloride resin composition not containing thermally expandable graphite covering the inner and outer surfaces of the thermally expandable fire-resistant layer may be adopted. In the case of a three-layer structure, the ratio of the thermally expandable graphite to 100 parts by weight of polyvinyl chloride resin is more preferably 6 to 18 parts by weight, and more preferably 10 to 16 parts by weight. If the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion is not obtained during combustion, and the desired fire resistance may not be obtained. If the amount of thermally expandable graphite exceeds 20 parts by weight, the graphite may expand too much when heated or the resin component may be insufficient, causing the residue to become brittle and unable to maintain its shape, which may lead to the residue dropping out of the through holes, resulting in reduced fire resistance. The lower connecting pipe 22 may be formed from a normal resin such as polyvinyl chloride resin, and a thermal expansion sheet may be wrapped around the outer circumferential surface of the lower connecting pipe 22 .

[0028] The horizontal main pipe 25 guides the wastewater that has flowed through the vertical main pipe 20 horizontally and discharges it into a septic tank or a main sewer pipe outside the premises. 1, the horizontal main pipe 25 includes a second pipe 32 and a cleaning joint 33. The second pipe 31 is connected to one receiving portion 31 of the leg joint 23. A support leg 35 is formed on the bottom side of the curved pipe portion 30, and this support leg 35 is supported by a support metal fitting or the like (not shown).

[0029] Four sets of projections 36 that protrude radially outward at 90° intervals in the circumferential direction are formed on the upper end side of the joint pipe body 26 of the collective joint 21, above the branch pipe connection part 27. Each projection 36 is provided with two ribs extending along the circumferential direction arranged at equal intervals in the pipe axial direction (up and down direction). Each rib of the protrusion 36 extends the same length in the circumferential direction, and the extension dimension can be set arbitrarily. These protrusions 36 are used for purposes such as locking a support fitting (not shown) when the collective joint 21 is supported by the support fitting or the like. In this embodiment, the protrusions 36 are not essential and may be omitted.

[0030] 2, the side branch pipe connecting portion 27 extends radially outward from the peripheral wall of the joint pipe main body 26. In this embodiment, three side branch pipe connecting portions 27 are formed. Of the three lateral branch pipe connecting portions 27, two are disposed at positions sandwiching the central axis O of the joint pipe main body 26. The remaining lateral branch pipe connecting portion 27 extends in a radial direction that forms an angle of 90° in top view with the directions in which the two lateral branch pipe connecting portions 27 extend. The number and extending direction of the side branch pipe connecting parts 27 are not limited to the form shown in this example, and can be changed as desired. In the example shown in the figure, side branch pipes 28 are connected separately to the side branch pipe connecting parts 27, but some of the side branch pipe connecting parts 27 may be closed by a blocking member such as a bush, as necessary.

[0031] The joint pipe body 26 is made of a polyvinyl chloride resin composition containing, for example, 100 parts by weight of polyvinyl chloride resin and 0.1 to 10.0 parts by weight of a flame retardant such as non-expandable graphite, magnesium hydroxide, or aluminum hydroxide. The joint pipe body 26 is obtained, for example, by injecting and filling the polyvinyl chloride resin composition into the cavity of a molding machine.

[0032] As shown in Figure 2, the manifold joint 21 has a cylindrical adapter 38 equipped with a vertical gasket 37 attached to the vertical pipe connection portion 26A at the upper end of the joint pipe body 26 to which the lower end of the vertical main pipe 20 is connected, and further, an end treatment member 39 is fitted to the upper end of the adapter 38. The end treatment member 39 has a ring shape that is fitted onto the upper end of the adapter 38, and has an insertion hole 39A through which the lower end of the vertical main pipe 20 can be inserted. An engagement protrusion 38a that extends circumferentially with a predetermined thickness is formed on the upper end of the outer circumferential surface of the adapter 38. The ring-shaped end treatment member 39 is fitted so as to surround the outer periphery of this engagement protrusion 38a, whereby the end treatment member 39 is fitted onto the upper end of the adapter 38.

[0033] The vertical packing 37 has a cylindrical body 37a fitted inside the adapter 38, and has a lip portion 37b protruding from the inner peripheral surface of the cylindrical body 37a. The vertical gasket 37 is made of a rubber material typically used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM), and is a gasket in which the lip portion 37b provided on the inner circumference of the upper end portion can be watertightly fitted to the outer peripheral surface of the lower end portion of the vertical main pipe 20. In addition, an inner peripheral step 37c is formed at the lower end of the cylindrical body 37a to reduce the inner diameter of the lower end of the cylindrical body 37a. When the lower end of the vertical main pipe 20 is inserted into the vertical packing 37, this inner peripheral step 37c functions as a stopper for the vertical main pipe 20.

[0034] The adapter 38 has a fitting portion 38b on a lower portion of the outer peripheral wall. This fitting portion 38b has a smaller diameter than an upper portion 38c of the outer peripheral wall of the adapter 38. By inserting the fitting portion 38b into the vertical pipe connecting portion 26A on the upper side of the joint pipe main body 26, the adapter 38 can be fitted into the vertical pipe connecting portion 26A of the joint pipe main body 26. An inwardly facing ring-shaped inner circumferential flange 40 is formed on the inner circumferential portion of the adapter 38 at the lower end side of the fitting portion 38b. A ring-shaped extension piece 40A extending a predetermined length in the tube axial direction is formed on the inner circumferential edge of this inner circumferential flange 40, and a plurality of protrusions 41 are formed at predetermined intervals around the inner periphery of this extension edge 40A.

[0035] In this embodiment, the projection length of the inner circumferential flange 40 (the projection length of the inner circumferential flange 40 along the radial direction from the inner peripheral surface of the cylindrical fitting portion 38b toward the axis of the fitting portion 38b) is set to a projection length capable of supporting the inner circumferential step portion 37c provided in the vertical packing 37. Therefore, the inner diameter of the inner circumferential flange 40 is approximately the same as the inner diameter of the inner circumferential step portion 37c in the vertical packing 37, and is approximately the same as the inner diameter of the lower end portion of the vertical main pipe 20 inserted into the vertical packing 37. The inner flange 40 guides the drainage flow that flows from the vertical main pipe 20 through the adapter 38 and the vertical pipe connection part 26A into the joint pipe body 26 while throttling it along the inner peripheral edge of the inner flange 40. The drainage flow that flows into the joint pipe body 26 due to the flow of the drainage flow passing through the inner peripheral edge of the inner flange 40 flows downward while forming a cylindrical water film.

[0036] In this embodiment, six protrusions 41 are formed at regular intervals in the inner circumferential direction of the inner flange 40. That is, in this example, six protrusions 41 are formed at 60° intervals in the inner circumferential direction of the inner flange 40. It is preferable that the protrusions 41 are formed equally spaced apart in the circumferential direction of the inner flange 40. The projection 41 is formed in a rectangular shape in a plan view when the opening of the adapter 38 is viewed from the central axis direction, as shown in Fig. 3 and Fig. 4, and in an isosceles triangle shape in a side view when the inner peripheral surface of the adapter 38 is viewed from the axial center side of the adapter 38 so that the projection 41 is disposed in front. The projection 41 in this embodiment is formed in an isosceles triangle shape in a side view having a bottom surface 41a and two inclined surfaces 41b, 41b. In addition, a rounded portion 41c is formed at the apex where the two inclined surfaces 41b, 41b intersect. This rounded portion 41c is defined by an inclined surface at the apex where the two inclined surfaces 41b, 41b intersect, such that the curvature gradually increases from the base end side of the projection 41 to the tip side of the projection 41.

[0037] In the structure of this embodiment, when the nominal diameter of the vertical main pipe 20 to which the joint pipe body 26 is connected is a general-purpose size for buildings of about 60 to 180, the height (h) of the protrusion 41 can be selected in the range of 5 to 15 mm, and the width (W) of the protrusion 41 can be selected in the range of 8 to 21 mm. In addition, it is more preferable that the height (h) of the protrusion 41 is about 10 to 15 mm. The height (h) of the protrusion 41 refers to the height (mm) of the protrusion 41 when viewed from the side from the center of the inner flange 40, in other words, the length of the protrusion 41 along the direction parallel to the axis of the joint pipe main body 26. The width (W) of the protrusion 41 refers to the width (length: mm) of the protrusion 41 along the circumferential direction of the inner flange 40.

[0038] The height of the protrusions needs to be a certain height in order to make a cut in the water film, but it is desirable to set it as small as possible within the range in which the cut can be made. The width of the protrusions needs to be a certain width in order to make a cut in the water film. There is no problem as long as it is within the above range. If the size of the protrusion 41 is made larger than necessary, foreign matter may flow along with the wastewater and become caught by the protrusion 41. For this reason, it is preferable to set the height and width of the protrusion 41 within the above-mentioned range, and by providing a rounded portion 41c at the upstream portion of the protrusion 41, it is possible to prevent foreign matter from becoming caught.

[0039] 5 shows the rough model shape, width (W) and height (h) of the protrusion 41. Note that in the present embodiment, the length (N) of the protrusion 41 in the direction perpendicular to the width (W) and height (h) is not particularly limited. In this embodiment, this length (N) corresponds to the length of the protrusion 41 parallel to the tube axis direction. The protrusions 41 are provided to cut the water film of the tubular drainage flow that falls after passing through the inner peripheral edge of the inner peripheral flange 40, thereby generating a divided portion in the water film. The height and width of the projections 41 are preferably within the above-mentioned ranges when they are formed into a triangular shape in side view in order to create a cut in the water film of the wastewater flow and generate a divided portion. Furthermore, the number of protrusions 41 formed on the inner circumference of the inner peripheral flange 40 may be any number as long as there are more than one, but it is preferable that the number of protrusions 41 corresponds to the number of side branch pipe connecting portions 27 formed in the joint pipe main body 26 and is greater than the number of installed side branch pipe connecting portions 27. In a normal configuration in which the number of installed side branch pipe connecting portions 27 is about 1 to 4, about 4 to 8 protrusions can be formed.

[0040] The adapter 38, vertical packing 37, and end treatment member 39 can be preassembled and integrated, and then the fitting portion 38a of the adapter 38 can be fitted and adhered to the vertical pipe connecting portion 26A of the joint pipe main body 26 to be integrated. The adapter 38 and the end treatment member 39 are made of a polyvinyl chloride resin composition containing, for example, 100 parts by weight of polyvinyl chloride resin and 0.1 to 10.0 parts by weight of a flame retardant such as non-expandable graphite, magnesium hydroxide, or aluminum hydroxide. The adapter 38 and the end treatment member 39 are obtained, for example, by injecting and filling the polyvinyl chloride resin composition individually into the cavity of a molding machine.

[0041] A plurality of vertical ribs 45 are formed inside the joint pipe body 26 to prevent wastewater that has flowed in from the opening of a specific side branch pipe connecting portion 27 from flowing into other side branch pipe connecting portions 27. In addition, swirl vanes 46 are formed on the bottom side of the joint pipe body 26 to make the wastewater flow a swirling flow. In this embodiment, the upper part of the joint pipe body 26 is provided with the protrusion 41, which sufficiently suppresses positive pressure, so that the configuration may not include the swirl vane 46. Furthermore, a swirl vane may be provided inside the leg joint 23 to suppress the generation of positive pressure, but in this embodiment, for the above-mentioned reasons, the leg joint 23 may not include a swirl vane.

[0042] In the water distribution pipe system 10 having the configuration shown in FIG. 1, wastewater discharged from sanitary equipment (drainage equipment) on each floor of a building flows into a vertical main pipe 20 of a drainage channel via horizontal branch pipes on each floor. The wastewater that reaches the lower end of the vertical main pipe 20 flows into the joint pipe body 26 along the inner peripheral edge of the inner peripheral flange 40. Due to the flow rate of the wastewater that falls along the vertical main pipe 20 and passes through the inner peripheral edge of the inner peripheral flange 40, the wastewater flow that flows into the joint pipe body 26 flows downward while forming a cylindrical water film. Due to the presence of the inner flange 40, the wastewater flow entering the joint pipe main body 26 flows downward while forming a cylindrical water film, but the water film of the wastewater flow becomes a cylindrical water film having an outer diameter corresponding to the inner diameter of the inner flange 40, and there is a risk that the opening of the horizontal branch pipe connection portion 27 will be blocked by this water film on the opening side of the horizontal branch pipe connection portion 27.

[0043] Here, since six protrusions 41 are formed on the inner peripheral side of the inner peripheral flange 40, the protrusions 41 create gaps in the water film flowing down through the inner peripheral flange 40, resulting in divided portions in the water film. When wastewater flows through the horizontal branch pipe 28 and reaches the opening of the horizontal branch pipe connection portion 27, the wastewater can flow into the joint pipe main body 26 through the divided portion of the water film described above. Therefore, according to the configuration of the drainage system 10 shown in Figure 1, even if the drainage water flowing from the vertical main pipe 20 to the joint pipe main body 26 forms a water film, it is possible to provide a configuration that does not cause an obstruction when the drainage water flows from the horizontal branch pipe 28 to the joint pipe main body 26. Therefore, in the water distribution system 10 configured as shown in Figure 1, a drainage system can be provided in which both the drainage from the vertical main pipe 20 and the drainage from the horizontal branch pipe 28 can be smoothly guided into the joint pipe body 26 and drained to the downstream side.

[0044] In this embodiment, six projections 41 are formed around the inner peripheral edge of the inner peripheral flange 40, so that even in a configuration in which multiple side branch pipe connecting parts 27 are connected, any of the divided parts of the water film can be adjacent to the opening of the side branch pipe connecting part 27. Therefore, it is possible to provide a configuration in which drainage from multiple side branch pipes 28 can be reliably introduced into the joint pipe main body 26 and drainage from the side branch pipe 28 is not hindered.

[0045] In addition, in the range where the amount of wastewater passing through the inner flange 40 is small, the thickness of the water film generated by the wastewater flowing into the joint pipe body 26 is small. In this case, the water film is unlikely to impede the wastewater flowing in from the opening of the horizontal branch pipe connecting portion 27. However, as the amount of wastewater passing through the inner peripheral flange 40 increases, the water film becomes thicker and is more likely to obstruct the wastewater flowing in from the opening of the horizontal branch pipe connecting portion 27. Even in such a case, the above-mentioned multiple protrusions 41 can be provided to create divided portions in the water film, so that the wastewater flowing in from the opening of the horizontal branch pipe connecting portion 27 can be reliably introduced into the inside of the joint pipe main body 26. If the projection 41 is provided with a rounded portion 41c on its upstream side, foreign matter, etc., will not get caught on the projection 41 even if it flows along with the wastewater. Therefore, clogging of the pipe will not occur in the portion where the projection 41 is provided.

[0046] Incidentally, in the configuration of the embodiment shown in Figures 1 to 4, a configuration has been described in which the protrusion 41 having an isosceles triangular shape when viewed from the side is provided on the inner flange 40, but the shape of the protrusion 41 is not limited to the shape shown in Figures 1 to 4. The shape of the protrusion 41 provided on the inner peripheral flange 40 may be a wing-shaped protrusion 50 as shown in FIG. 6(a) or a wing-shaped protrusion 51 as shown in FIG. 6(b). The shape of the protrusion provided on the inner flange 40 may be a roof-shaped protrusion 52 shown in FIG. 7(a), a roof-shaped protrusion 53 shown in FIG. 7(b), a roof-shaped protrusion 54 shown in FIG. 7(c), or a roof-shaped protrusion 55 shown in FIG. 7(d).

[0047] The protrusion 50 shown in FIG. 6(a) is a wing-shaped protrusion having four inclined surfaces 50b extending at the same inclination angle from each of the four sides of a rectangular base surface 50a, and a quadrilateral-shaped tip surface 50c formed on the tip side of each inclined surface 50b and inclined relative to these inclined surfaces. The protrusion 51 shown in FIG. 1(b) is a wing-shaped protrusion having four inclined surfaces 51b extending at the same inclination angle from each of the four sides of a rectangular bottom surface 51a, one of which is tapered, and a triangular tip surface 51c is formed at the tip side of each inclined surface, inclined relative to these inclined surfaces.

[0048] The protrusion 52 shown in FIG. 7(a) is an isosceles triangular protrusion in a side view, with two inclined surfaces 52b extending at the same inclination angle from both short sides of a rectangular bottom surface 52a. The protrusion 53 shown in FIG. 7(b) is a right-angled triangular protrusion when viewed from the side, having a rectangular base 53a, a vertical surface 53b rising from one short side at an angle of 90°, and an inclined surface 53c inclined from the other short side at a base angle of less than 90°.

[0049] The protrusion 54 shown in FIG. 7(c) is an isosceles triangular protrusion in side view having two inclined surfaces 54b extending at the same inclination angle from both short sides of a rectangular base surface 54a, and has an arc portion 54d with a predetermined radius of curvature formed on the upper part of the front surface 54c sandwiched between the two inclined surfaces 54b. The protrusion 55 shown in FIG. 7(d) is a right-angled triangular protrusion in side view having a rectangular bottom surface 55a, a vertical surface 55b rising from one short side at an angle of 90° and a sloping surface 55c inclined from the other short side at a base angle of less than 90°, and has an arc portion 55e with a predetermined radius of curvature formed on the upper part of a front surface 55d sandwiched between the vertical surface 55b and the sloping surface 55c.

[0050] Furthermore, the shape of the protrusion provided on the inner peripheral flange 40 may be a triangular pyramid-shaped protrusion 56 as shown in FIG. Comparing the wing-shaped protrusions 50, 51, the roof-shaped protrusions 52-55, and the triangular pyramid-shaped protrusion 56, the triangular pyramid-shaped protrusion 56 has good drainage performance, while the wing-shaped protrusions 50, 51 and the roof-shaped protrusions 52-55 have even better drainage performance. In addition, with regard to the occurrence of pipe clogging, it is desirable to provide rounded portions in the wing-shaped protrusions 50 and 51 and the roof-shaped protrusions 52 to 55. The triangular pyramid-shaped protrusion 56 is considered to be excellent in terms of the occurrence of pipe clogging as it is.

[0051] However, the shapes of the projections applicable to this embodiment are not limited to the projections 41, 50 to 56 described above. For example, they may be polygonal, such as a square, pentagonal, or hexagonal shape when viewed from the side. In the case of such polygonal shapes, in order to form a good cut in the water film, it is desirable to arrange one of the corners toward the upstream side of the flow of the wastewater flow, and to make a cut in the water film by causing the wastewater to flow along two slopes constituting the corners.

[0052] The positions of the protrusions 41, 50-56 are preferably aligned with the opening of the horizontal pipe connecting part 27 in a plan view, but if multiple protrusions are provided in the circumferential direction of the adapter 38, it does not matter if their positions are slightly misaligned in the circumferential direction. When only one horizontal pipe connecting part 27 is provided, only one protrusion may be provided, but in that case, it is preferable to align the protrusion with the opening of the horizontal pipe connecting part 27 in a plan view. EXAMPLES

[0053] "Example 1" An adapter was created as an adapter to be inserted between the vertical pipe and the joint pipe body, which was a resin integral molding, cylindrical as shown in Figure 9, with an outer diameter of 153 mm, an inner diameter of 130 mm, and an inner flange inner diameter of 101 mm. This adapter had four triangular pyramid-shaped protrusions formed on the inner side of the inner flange at equal intervals around the inner circumference (90° intervals around the inner circumference). The size of the protrusions was 15 mm in height and 18 mm in width. "Example 2" An adapter was created as an adapter to be inserted between the vertical pipe and the joint pipe body, which was a resin integral molding, cylindrical as shown in Figure 10, with an outer diameter of 153 mm, an inner diameter of 130 mm, and an inner flange inner diameter of 101 mm. This adapter had four roof-shaped protrusions that were isosceles triangular in side view formed at equal intervals around the inner circumference (90° intervals around the inner circumference) on the inner side of the inner flange. The size of the protrusions was 15 mm in height and 18 mm in width.

[0054] The adapters of Examples 1 and 2 were each individually inserted into the vertical pipe and fitted, the vertical pipe was placed vertically with the adapters facing downwards, water was allowed to flow through the vertical pipe at a rate of 5 L / s, and the width of the gap that formed in the cylindrical water film falling from the bottom end of the adapter directly below the adapter was measured. In both the configurations of Example 1 and Example 2, it was confirmed that four gaps of approximately 50 mm width were formed in the water film formed by the cylindrical water drop directly below the adapter.

[0055] Therefore, with the configurations of Examples 1 and 2, it is possible to reliably create a cut in the water film and generate a divided portion of the water film. Therefore, when applied to the drainage system shown in Figure 1, it was found that even if water flows inside the joint pipe main body and forms a water film, drainage can be reliably flowed from the horizontal branch pipe to the joint pipe main body. In contrast, as Comparative Example 1, a test equivalent to that of Example 1 was conducted using an adapter of the same size as that of Example 1, but with only an inner flange and a structure in which the protrusions were omitted. No breaks were observed in the water film formed directly below the adapter.

[0056] Next, the adapters of Examples 1 and 2 and Comparative Example 1 were installed in the drainage system shown in Figure 1, and the positive pressure near the horizontal pipe connection was measured when water was flowing at 5 L / s. The results are shown below. Example 1...260 Pa, Example 2...260 Pa, Comparative Example 1...460 Pa.

[0057] As is clear from the above comparison results, it was found that by providing protrusions at regular intervals around the inner circumference of the adapter, the positive pressure inside the piping can be lowered compared to when an adapter without protrusions is used.

[0058] Furthermore, the technical scope of the present invention described above is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate without departing from the spirit of the present invention, and it is of course possible to combine the above-described embodiments as appropriate. Furthermore, in the embodiments described so far, an example has been described in which the present invention is applied to a drainage manifold joint 10, but it goes without saying that the present invention can be widely applied to various types of pipe joints, including general joints other than drainage manifold joints. [Explanation of symbols]

[0059] 10...Drainage system, 20...Standpipe (first vertical pipe), 21...Collecting joint (pipe joint), 22...Lower connecting pipe (second vertical pipe: straight pipe), 23...Leg joint, 25...Horizontal main pipe, 26... joint pipe body, 26A... first vertical pipe connection part, 26B... second vertical pipe connection part, 27... side branch pipe connection portion, 28... side branch pipe, 38... adapter, 40... inner peripheral flange, 41, 50, 51, 52, 53, 54, 55, 56...Protrusion.

Claims

1. a joint pipe body having at one end a vertical pipe connection portion connectable to an upstream vertical pipe and at a side surface a horizontal branch pipe connection portion connectable to a horizontal branch pipe, and a lower connecting pipe connected to a lower end of the joint pipe body, The joint pipe body and the lower connecting pipe are made of resin, a thermal expansion sheet is wrapped around an outer circumferential surface of the lower connecting pipe; A pipe fitting, in which one or more protrusions are formed on an inner circumferential surface of the fitting pipe body on the side of the vertical pipe connection portion upstream of the horizontal branch pipe connection portion.

2. a joint pipe body having at one end a vertical pipe connection portion connectable to an upstream vertical pipe and at a side surface a horizontal branch pipe connection portion connectable to a horizontal branch pipe, and a lower connecting pipe connected to a lower end of the joint pipe body, The joint pipe body and the lower connecting pipe are made of resin, the lower connecting pipe is formed of a resin composition containing a polyvinyl chloride resin and a thermally expandable fire-resistant material, A pipe fitting, in which one or more protrusions are formed on an inner circumferential surface of the fitting pipe body on the side of the vertical pipe connection portion upstream of the horizontal branch pipe connection portion.

3. The joint pipe body has a longitudinal rib therein, 3. A pipe joint according to claim 1, wherein an upper end of the longitudinal rib is located below a lower end of the projection.

4. 4. A pipe joint according to claim 1, further comprising swirl vanes on a bottom side of the joint pipe body.

5. 5. A pipe joint according to claim 1, wherein an outer surface of the joint pipe body is provided with a protrusion extending in a circumferential direction.

6. A drainage system in which the pipe fitting according to any one of claims 1 to 5 is arranged with the vertical pipe connection portion on one end side connected to a first vertical pipe on the upstream side and the other end side connected to a second vertical pipe on the downstream side.

7. A drainage system comprising a pipe joint according to any one of claims 1 to 5, The drainage system comprises a leg joint connected to the lower end of the lower connecting pipe, and a horizontal main pipe connected to the leg joint.

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