Pipe fittings and drainage systems

Abstract

The present invention aims to provide a pipe joint and an installation structure for the pipe joint. [Solution] The pipe joint of the present invention comprises a joint pipe body 26 having a vertical pipe connection portion 26A at one end that can be connected to an upstream vertical pipe 20, and a horizontal branch pipe connection portion 27 on its side that can be connected to a horizontal branch pipe 28, wherein a plurality of protrusions are formed at intervals in the circumferential direction on the inner circumferential surface of the portion of the joint pipe body 26 that is on the vertical pipe connection portion side and upstream of the horizontal branch pipe connection portion 27.

Description

Technical Field

[0001] The present invention relates to a pipe joint and a drainage system.

Background Art

[0002] In multi-story buildings such as apartment houses, a horizontal branch pipe for introducing drainage from sanitary appliances and the like in the living quarters on each floor is provided, and the drainage is drained into the sewer by connecting this horizontal branch pipe to a vertical drainage pipe in a pipe shaft. At the portion where the vertical drainage pipe connected to the horizontal branch pipe penetrates the floor slab, a resin joint member called a drainage collecting joint is arranged. Conventionally, this drainage collecting joint has an upper connecting pipe for connecting the vertical drainage pipe, a horizontal branch pipe connecting portion formed on the side surface of the upper connecting pipe, and a lower connecting pipe connected to the lower end portion of the upper connecting pipe and passing through the through-hole of the floor slab vertically.

[0003] Also, as described in Patent Document 1 below, a drainage collecting pipe is known in which a backflow prevention rib extending in the pipe axis direction is provided on the inner peripheral surface of the joint pipe body so that the drainage flowing into the joint pipe body from a specific horizontal branch pipe does not flow back to other horizontal branch pipes.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The inventor of the present application has found that in a drainage collecting joint connecting a vertical drainage pipe and a horizontal branch pipe, when drainage flows vigorously from the vertical drainage pipe into the inside of the drainage collecting joint, the drainage flow may flow down inside the drainage collecting joint while forming a cylindrical water film. In this case, the drainage flow, which forms a cylindrical water film, passes over the connection point with the horizontal branch pipe, potentially obstructing the drainage flowing from the horizontal branch pipe to the drainage manifold joint. Furthermore, in some cases, the drainage flow from the vertical drain pipe to the drainage manifold joint may become positive pressure, while the drainage flow attempting to flow from the horizontal branch pipe to the drainage manifold joint may become negative pressure, raising concerns about backflow of drainage into the horizontal branch pipe.

[0006] The present invention has been made in view of the circumstances described above, and aims to provide a pipe joint and a drainage system that create a gap in the flow of water from the vertical pipe to the main body of the joint pipe by a projection, thereby ensuring that water flows reliably from the horizontal branch pipe to the main body of the joint pipe. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention proposes the following embodiments. (1) The pipe joint according to this embodiment comprises a joint pipe body having a vertical pipe connection portion at one end that can be connected to an upstream vertical pipe and a horizontal branch pipe connection portion on its side that can be connected to a horizontal branch pipe, and the joint pipe body is characterized in that one or more protrusions are formed on the inner circumferential surface on the vertical pipe connection portion side that is upstream of the horizontal branch pipe connection portion.

[0008] By providing one or more projections that protrude inward in the vertical pipe connection area on the upstream side of the horizontal branch pipe connection area of ​​the main joint pipe body, a discontinuity equivalent to a break can be formed in the flow of water that flows from the vertical pipe towards the main joint pipe body, forming a cylindrical water film. Water that attempts to flow into the main joint pipe body via the horizontal branch pipe connection area can then flow into the main joint pipe body through this discontinuity. Therefore, even if water flows forcefully from the vertical pipe into the main body of the joint pipe, creating a cylindrical water film inside the main body of the joint pipe, water can still flow from the horizontal branch pipe into the main body of the joint pipe without any problems. This prevents the internal pressure inside the main body of the joint pipe near the connection point of the horizontal branch pipe from becoming excessively high, and prevents backflow of water from the main body of the joint pipe to the horizontal branch pipe. If multiple protrusions are provided, it can accommodate structures with multiple lateral branch pipe connections, and multiple breaks corresponding to multiple gaps can be created in the water film, thus accommodating the introduction of water in structures where water flows into the joint body from multiple lateral branch pipes.

[0009] (2) The pipe joint according to this embodiment may have an annular adapter that can be attached to the portion of the joint pipe body upstream of the horizontal branch pipe connection portion on the vertical pipe connection portion side, and one or more protrusions may be formed on the inner surface of this adapter.

[0010] By providing one or more protrusions on the inner circumference of an adapter that can be attached to the vertical pipe connection side of the joint pipe body, it is possible to provide protrusions on the vertical pipe connection side of the joint pipe body without making any special modifications to the joint pipe body itself. When the joint pipe body is a single molded resin product, if a separate protrusion is added to the joint pipe body, it may not be possible to create the protrusion at the desired location due to the shape of the mold used for molding and constraints during the molding process. However, by creating the protrusion on an adapter separate from the joint pipe body, the protrusion can be created at the desired location without being constrained by the limitations that would apply when creating the protrusion on the joint pipe body. If the adapter is provided with multiple protrusions, it can accommodate structures with multiple lateral branch pipe connections, and since it can create multiple breaks in the water film, it can accommodate the introduction of water in structures where water flows into the fitting body from multiple lateral branch pipes.

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

[0012] If the projection has a polygonal shape when viewed from the side, the slopes of the projections that make up the corners of the polygon can be used to reliably introduce a break in the water film created by the flow of water into the main body of the joint pipe via the vertical pipe connection, thereby enabling the inflow of water from the horizontal branch pipe connection.

[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 multi-story buildings, the main body of the joint pipe, located on the lowest floor, often receives a large, forceful influx of drainage from the upper floors. This creates a water film that forms as the water flows vigorously downwards in a cylindrical shape from the vertical pipe into the main body of the joint pipe. Consequently, the inside of the main body of the joint pipe, near the horizontal branch pipe connection, tends to become positively pressurized, increasing the risk of backflow into the horizontal branch pipe. However, by introducing a section with a protrusion to interrupt the water film flowing from the vertical pipe connection into the main body of the joint pipe, a structure can be provided that does not obstruct the flow of water from the horizontal branch pipe connection to the main body of the joint pipe.

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

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

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

[0018] By providing one or more projections that protrude inward in the vertical pipe connection side of the main joint pipe body, upstream of the horizontal branch pipe connection side, a section can be created in the flow of water that flows from the vertical pipe towards the main joint pipe body, forming a cylindrical water film. Water that would otherwise flow into the main joint pipe body via the horizontal branch pipe connection can then flow into the main joint pipe body through this section. Therefore, even if water flows forcefully from the first vertical pipe into the joint pipe body and creates a cylindrical water film flowing down inside the joint pipe body, water can still be introduced into the joint pipe body from the horizontal branch pipe without any problems. As a result, water can be introduced into the joint pipe body without any problems from both the vertical pipe connection and the horizontal branch pipe connection, and the water introduced into the joint pipe body can be discharged to the second vertical pipe connected to the joint pipe body. In addition, since it is possible to suppress the internal pressure from becoming excessively high inside the joint pipe body near the lateral branch pipe connection part, it is possible to prevent the reverse flow of water from the joint pipe body side to the lateral branch pipe side.

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

[0020] In the drainage system according to this embodiment, while preventing reverse flow to the lateral branch pipe side, it is possible to reliably introduce the drainage from the vertical pipe and the lateral branch pipe into the joint pipe body and drain it to the main lateral pipe side, and drain it to the main sewer pipe or the septic tank via the main lateral pipe.

Effect of the Invention

[0021] According to the present invention, even if a water film flowing down in a cylindrical shape is generated from the vertical pipe connection part to the joint pipe body side, a dividing part can be formed in the water film by the protrusion. Water flowing from the lateral branch pipe connection part into the joint pipe body can flow into the joint pipe body through this dividing part. Therefore, it is possible to suppress the internal pressure from becoming excessively high inside the joint pipe body near the lateral branch pipe connection part and prevent the reverse flow of water to the lateral branch pipe side.

Brief Description of the Drawings

[0022] [Figure 1] It is a side view of a drainage system provided with the pipe joint according to the first embodiment of the present invention, showing a vertical pipe, a collective joint, a lateral branch pipe, and a main lateral pipe in a side view. [Figure 2] It is a cross-sectional view of the same pipe joint. [Figure 3] It is a plan view of the protrusion push adapter incorporated in the same pipe joint. [Figure 4] It is a perspective view of the same adapter. [Figure 5] It is a diagram showing the relationship between the width and height of the protrusion formed on the same adapter. [Figure 6]These images show examples of cases where the protrusions formed on the adapter are shaped like wings; (a) is a perspective view showing the first example, and (b) is a perspective view showing the second example. [Figure 7] The following are examples of cases where the protrusion formed on the adapter is shaped like a roof: (a) is a perspective view showing the first example, (b) is a perspective view showing the second example, (c) is a perspective view showing the third example, and (d) is a perspective view showing the fourth example. [Figure 8] This is a perspective view showing an example where the protrusion formed on the adapter is a triangular pyramid. [Figure 9] This is a plan view showing the adapter used in the embodiment, which has four triangular pyramidal protrusions in the inner circumferential direction. [Figure 10] This is a plan view showing the adapter used in the embodiment, which has four roof-shaped protrusions in the circumferential direction. [Modes for carrying out the invention]

[0023] The following describes an example of applying a pipe joint according to one embodiment of the present invention to a building's drainage system, with reference to Figures 1 to 4. As shown in Figure 1, the drainage system 10 of this embodiment is an example of an application to a multi-story building such as a high-rise apartment building or a commercial building. In this type of building, wastewater discharged from sanitary equipment (drainage facilities) such as toilets, vanity units, and sinks on each floor flows into the vertical main pipe 20 that constitutes the drainage channel via horizontal branch pipes (not shown). As shown in Figure 1, the drainage system 10 includes a vertical main pipe (first vertical pipe) 20, a manifold 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 manifold joint 21, leg joints 23 sequentially connected to the lower connecting pipe 22, and a horizontal main pipe 25.

[0024] The vertical main pipe 20 is installed to pass through each floor (floor slab). Drainage from each drainage facility flows down along the vertical main pipe 20 to the lowest floor of the multi-story building, and then flows into the horizontal main pipe 25 via a manifold joint (pipe joint) 21, lower connecting pipe 22, and leg joint 23 connected to the lower end of the vertical main pipe 20, and is finally sent to the main sewer line or septic tank. The drainage system 10 discharges the drainage from the drainage facilities on each floor to the outside of the building. The vertical main pipe 20 collects drainage from the drainage facilities on each floor and guides it downwards. The vertical main pipe 20 is equipped with a first pipe (not shown) that connects multiple manifold fittings provided on each floor with manifold fittings located on adjacent floors in the vertical direction.

[0025] Of the multiple manifold joints, as shown in Figure 1, the manifold joint 21 for the lowest floor, which is installed on the lowest floor of the building, is to which the characteristic configuration of this embodiment, which will be described later, is applied. The manifold joint 21 has a cylindrical joint pipe body 26, and three branch pipe connection sections 27 are formed around its outer surface, to which horizontal branch pipes (horizontal pipes) 28 are connected. The horizontal branch pipe 28 guides the wastewater discharged from the drainage system into the main body of the joint pipe 26 via the branch pipe connection 27. A first vertical pipe connection 26A is formed at the upper end of the main body of the joint pipe 26, and a second vertical pipe connection 26B is formed at the lower end of the main body of the joint pipe 26.

[0026] The lower end of the vertical main pipe 20 is joined to the first vertical pipe connection portion 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 portion 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 receiving portions 31 at both ends of an L-shaped curved pipe portion 30 when viewed from the side.

[0027] The lower connecting pipe 22 is made of a resin composition containing, for example, a polyvinyl chloride resin and a heat-expandable refractory material, which is heat-expandable graphite. That is, the lower connecting pipe 22 is manufactured by extruding a resin composition containing a heat-expandable refractory material. By providing these heat-expandable fire-resistant materials, fire resistance can be achieved when the lower connecting pipe 22 is inserted through the through-hole provided in the floor slab. As an example, a single-layer structure can be adopted, consisting of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. Alternatively, a three-layer structure may be adopted, consisting of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin, and a coating layer of a polyvinyl chloride resin composition that does not contain thermally expandable graphite covering the inner and outer surfaces of this thermally expandable fire-resistant layer. In the case of a three-layer structure, a ratio of 6 to 18 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin is more preferable, and a ratio of 10 to 16 parts by weight is even more preferable. If the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion may not be obtained during combustion, and the desired fire resistance may not be achieved. If the amount of thermally expandable graphite exceeds 20 parts by weight, the residue may become brittle due to excessive thermal expansion upon heating or insufficient resin components, potentially causing it to detach from the through-holes and reducing fire resistance. Alternatively, the lower connecting pipe 22 may be made of a conventional resin such as polyvinyl chloride resin, and a thermal expansion sheet may be wrapped around the outer 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 to a septic tank or the main sewer line outside the property. In the configuration shown in Figure 1, the horizontal main pipe 25 is equipped with a second pipe 32 and a cleaning fitting 33. The second pipe 31 is connected to one of the receiving portions 31 of the leg fitting 23. Support legs 35 are formed on the bottom side of the curved pipe section 30, and these support legs 35 are supported by support fittings or the like (not shown).

[0029] In the main body 26 of the manifold joint 21, four sets of projections 36 are formed on the upper end side, above the branch pipe connection portion 27, projecting radially outward at 90° intervals in the circumferential direction. Each projection 36 is provided with two ribs extending along the circumferential direction, arranged at equal intervals in the pipe axis direction (vertical direction). Each rib of the projection 36 extends in the circumferential direction for the same length, and its extension dimension can be arbitrarily set. These projections 36 are used for purposes such as locking the support bracket (not shown) when supporting the manifold joint 21 with a support bracket. In this embodiment, the projections 36 are not essential and may be omitted.

[0030] As shown in Figure 2, the lateral branch pipe connection portion 27 extends radially outward from the circumferential wall of the joint pipe body 26. In this embodiment, three lateral branch pipe connection portions 27 are formed. Of the three lateral branch pipe connection sections 27, two are positioned separately on either side of the central axis O of the joint pipe body 26. The remaining lateral branch pipe connection section 27 extends radially in a direction that forms a 90° angle with the direction in which each of the aforementioned two lateral branch pipe connection sections 27 extends, when viewed from above. The number and direction of extension of the lateral branch pipe connections 27 are not limited to the configuration shown in this example and can be changed as needed. In the example shown, each lateral branch pipe 28 is individually connected to the lateral branch pipe connections 27, but some of the lateral branch pipe connections 27 may be closed off with closing members such as bushings as needed.

[0031] The joint pipe body 26 is made of a polyvinyl chloride resin composition containing, for example, 0.1 to 10.0 parts by weight of a flame retardant such as non-expanding graphite, magnesium hydroxide, or aluminum hydroxide per 100 parts by weight of polyvinyl chloride resin. The joint pipe body 26 is obtained, for example, by injection 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 packing 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 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 fits onto the upper end of the adapter 38 and has a through hole 39A through which the lower end of the vertical main pipe 20 can be inserted. An engaging projection 38a is formed on the upper end of the outer circumferential surface of the adapter 38, extending along its circumferential direction with a predetermined thickness. The end treatment member 39 is fitted onto the upper end of the adapter 38 by fitting the ring-shaped end treatment member 39 so as to surround the outer circumference of this engaging projection 38a.

[0033] The vertical packing 37 has a cylindrical body 37a fitted inside the adapter 38, and a lip portion 37b that protrudes from the inner circumferential surface of the cylindrical body 37a. The vertical packing 37 is made of a rubber material commonly used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM), and is a packing in which the lip portion 37b provided on the inner circumference of the upper end can be tightly sealed to the outer surface of the lower end of the vertical main pipe 20. Furthermore, an inner circumferential step portion 37c is formed at the lower end of the cylindrical body 37a, which narrows the inner diameter of the lower end of the cylindrical body 37a. This inner circumferential step portion 37c functions as a stopper for the vertical main pipe 20 when the lower end of the vertical main pipe 20 is inserted inside the vertical packing 37.

[0034] The adapter 38 has a fitting portion 38b at the lower part of its outer periphery wall. This fitting portion 38b has a smaller diameter than the upper part 38c of the outer periphery wall of the adapter 38, and the adapter 38 can be fitted into the vertical pipe connection portion 26A of the joint pipe body 26 by inserting the fitting portion 38b into the vertical pipe connection portion 26A on the upper side of the joint pipe body 26. An inward-facing ring-shaped inner flange 40 is formed on the inner circumference of the adapter 38, on the lower end side of the fitting portion 38b. A ring-shaped extension 40A is formed on the inner edge of this inner flange 40, extending for a predetermined length in the direction of the pipe axis, and a plurality of protrusions 41 are formed at predetermined intervals around the inner circumference of this extension 40A.

[0035] In this embodiment, the overhang length of the inner flange 40 (the length of the inner flange 40 protruding along the radial direction toward the axis of the cylindrical fitting portion 38b from the inner surface of the fitting portion 38b) is set to an overhang length that can support the inner stepped portion 37c provided on the vertical packing 37. Therefore, the inner diameter of the inner flange 40 is approximately the same as the inner diameter of the inner stepped portion 37c in the vertical packing 37, and is approximately the same as the inner diameter of the lower end of the vertical main pipe 20 inserted into the vertical packing 37. The inner flange 40 directs the drainage flow from the vertical main pipe 20 through the adapter 38 and the vertical pipe connection section 26A into the joint pipe body 26, narrowing it along the inner edge of the inner flange 40 as it flows into the joint pipe body 26. The drainage flow passing through the inner edge of the inner flange 40 creates a cylindrical water film as it flows downward into the joint pipe body 26.

[0036] In this embodiment, six projections 41 are formed at regular intervals in the inner circumferential direction of the inner flange 40. That is, in this example, six projections 41 are formed at 60° intervals in the inner circumferential direction of the inner flange 40. Preferably, the projections 41 are formed evenly at equal intervals in the circumferential direction of the inner flange 40. As shown in Figures 3 and 4, the projection 41 is formed in a rectangular shape in plan view when the opening of the adapter 38 is viewed from the direction of its central axis, and in an isosceles triangular shape in side view when the inner circumferential surface of the adapter 38 is viewed so that the projection 41 is positioned in front of the adapter 38 from the axial side. In this embodiment, the projection 41 is formed in a side view as an isosceles triangle, having a base surface 41a and two inclined surfaces 41b, 41b. Furthermore, 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 end side.

[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 building size of about 60 to 180, the height (h) of the projection 41 can be selected from a range of 5 to 15 mm, and the width (W) of the projection 41 can be selected from a range of 8 to 21 mm. Furthermore, it is more preferable that the height (h) of the projection 41 be about 10 to 15 mm. The height (h) of the projection 41 refers to the height (mm) of the projection 41 when viewed from the side from the center side of the inner flange 40; in other words, it means the length of the projection 41 along the axis parallel to the axis of the joint pipe body 26. The width (W) of the projection 41 refers to the width (length: mm) of the projection 41 along the circumferential direction of the inner flange 40.

[0038] Regarding the height of the protrusion, a certain height is necessary to create a cleavage in the water film, but it is desirable to set it as small as possible within the range where a cleavage can be created. Regarding the width of the protrusion, a certain width is necessary to create a cleavage in the water film. Within the range mentioned above, there is no problem. Furthermore, if the size of the projection 41 is made unnecessarily large, there is a risk that foreign objects may get caught on the projection 41 when they are carried away with the drainage. For this reason, it is preferable to keep the height and width of the projection 41 within the range described above, and by providing a rounded portion 41c on the upstream side of the projection 41, the likelihood of foreign objects getting caught can be suppressed.

[0039] Figure 5 shows the general model shape of the projection 41, along with its width (W) and height (h). In this embodiment, there are no particular restrictions on the length (N) of the projection 41 in the direction perpendicular to the width (W) and height (h). In this embodiment, this length (N) corresponds to the length of the projection 41 parallel to the pipe axis direction. The projection 41 is provided to create a break in the water film of the cylindrical drainage flow that falls through the inner edge of the inner flange 40, thereby creating a segmented portion in the water film. When the projection 41 is formed in a triangular shape in a side view to create a break in the water film of the drainage flow and generate a segmented portion, the height and width of the projection 41 are preferably within the range described above. Furthermore, the number of projections 41 formed on the inner circumference of the inner flange 40 can be any number as long as there are multiple projections, but it is preferable to have more projections 41 than the number of lateral branch pipe connection parts 27 formed on the joint pipe body 26. In a typical configuration where the number of lateral branch pipe connection parts 27 is about 1 to 4, approximately 4 to 8 projections can be formed.

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

[0041] Multiple vertical ribs 45 are formed inside the main body 26 of the joint pipe to prevent wastewater flowing in from one horizontal branch pipe connection 27 from flowing into other horizontal branch pipe connections 27. Additionally, swirling vanes 46 are formed on the bottom side of the main body 26 of the joint pipe to create a swirling flow for the wastewater. In this embodiment, the joint pipe body 26 is provided with a projection 41 on its upper part, and positive pressure is sufficiently suppressed, so the swivel vane 46 may not be provided. Furthermore, while swivel vanes may be provided inside the leg joint 23 to suppress the generation of positive pressure, in this embodiment, for the reasons mentioned above, the leg joint 23 may not have swivel vanes inside.

[0042] In the water distribution system 10 with the configuration shown in Figure 1, wastewater discharged from sanitary equipment (drainage facilities) on each floor of the building flows into the vertical main pipe 20 of the 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 edge of the inner flange 40. Due to the flow rate of the wastewater falling along the vertical main pipe 20 and passing through the inner edge of the inner flange 40, the wastewater flowing into the joint pipe body 26 flows downward while creating a cylindrical water film. Due to the presence of the inner flange 40, the wastewater flowing into the joint pipe body 26 forms a cylindrical water film and flows downward. However, the water film of the wastewater flow has an outer diameter corresponding to the inner diameter of the inner flange 40, and there is a risk that this water film may obstruct the opening of the lateral branch pipe connection 27 on the opening side of the lateral branch pipe connection 27.

[0043] Here, since six protrusions 41 are formed on the inner circumference side of the inner flange 40, the protrusions 41 cause breaks in the water film as it flows down through the inner flange 40, creating fragmented portions in the water film. When wastewater flows through the lateral branch pipe 28 and reaches the opening of the lateral branch pipe connection section 27, this wastewater can flow into the joint pipe body 26 through the aforementioned interrupted portion of the water film. Therefore, according to the configuration of the drainage system 10 shown in Figure 1, even if the drainage flowing from the vertical main pipe 20 to the joint pipe body 26 forms a water film, it is possible to provide a configuration that does not obstruct the drainage flowing from the horizontal branch pipe 28 to the joint pipe body 26. Therefore, the water distribution system 10 with the configuration shown in Figure 1 can provide a drainage system that can guide both the drainage from the vertical main pipe 20 and the drainage from the horizontal branch pipes 28 into the joint pipe body 26 without any problems and drain to the downstream side.

[0044] In this embodiment, since six protrusions 41 are formed around the inner edge of the inner flange 40, even in a configuration where multiple lateral branch pipe connection parts 27 are connected, one of the water film-disrupting portions can be positioned adjacent to the opening of the lateral branch pipe connection part 27. Therefore, drainage from multiple lateral branch pipes 28 can be reliably introduced into the joint pipe body 26, and a configuration can be provided that does not hinder drainage from the lateral branch pipes 28.

[0045] Furthermore, in areas 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 obstruct the wastewater flowing in from the opening of the lateral branch pipe connection 27. However, as the amount of wastewater passing through the inner flange 40 increases, the water film thickens, which can easily obstruct wastewater attempting to flow in through the opening of the lateral branch pipe connection 27. Even in such cases, the aforementioned multiple protrusions 41 can be provided to create a gap in the water film, thereby ensuring that wastewater attempting to flow in through the opening of the lateral branch pipe connection 27 is reliably introduced into the joint pipe body 26. If a curved portion 41c is formed on the upstream side of the projection 41, foreign objects will not get caught on the projection 41 even if they flow in with the drainage. Therefore, pipe blockage will not occur in the section where the projection 41 is provided.

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

[0047] The projection 50 shown in Figure 6(a) is a wing-shaped projection having four inclined surfaces 50b extending from each of the four sides of a rectangular base surface 50a at the same angle of inclination, and a four-sided tip surface 50c that is inclined relative to these inclined surfaces on the tip side of each inclined surface 50b. The projection 51 shown in Figure (b) has four inclined surfaces 51b extending from each of the four sides of a rectangular base surface 51a at the same angle of inclination. One of the four inclined surfaces 51b is tapered, and a triangular tip surface 51c is formed on the tip side of each inclined surface, inclined relative to these inclined surfaces, making it a wing-shaped projection.

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

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

[0050] Furthermore, the shape of the projection provided on the inner flange 40 may be a triangular pyramidal projection 56 as shown in Figure 8. Comparing the wing-shaped protrusions 50 and 51 with the roof-shaped protrusions 52 to 55 and the triangular pyramidal protrusion 56, the triangular pyramidal protrusion 56 has good drainage performance, while the wing-shaped protrusions 50 and 51 and the roof-shaped protrusions 52 to 55 have even better drainage performance. Furthermore, regarding the occurrence of pipe blockages, it is desirable to provide a rounded section for the wing-shaped protrusions 50 and 51 and the roof-shaped protrusions 52 to 55. The triangular pyramidal protrusion 56 is considered to be superior in terms of preventing pipe blockages in its original shape.

[0051] Incidentally, the protrusions applicable to this embodiment are not limited to the shapes of protrusions 41, 50-56 described above. For example, they may be polygonal in shape, such as a square, pentagon, or hexagon when viewed from the side. In the case of such polygonal shapes, in order to form a good break in the water film, it is desirable to position one of the corners toward the upstream side of the drainage flow and to allow the drainage to flow along the two slopes constituting the corner to create a break in the water film.

[0052] In addition, it is desirable that the positions of the protrusions 41, 50-56 be aligned with the opening of the horizontal pipe connection section 27 in a plan view. However, if multiple protrusions are provided in the circumferential direction of the adapter 38, it is acceptable if their positions are slightly offset in the circumferential direction. In cases where only one horizontal pipe connection section 27 is provided, only one protrusion may be provided. In such cases, it is desirable to align the protrusion with the opening of the horizontal pipe connection section 27 in a plan view. [Examples]

[0053] "Example 1" An adapter was fabricated as an interposed between the vertical pipe and the main body of the joint pipe. It is a single-piece molded resin product, cylindrical in shape as shown in Figure 9, with an outer diameter of 153 mm, an inner diameter of 130 mm, and an inner flange diameter of 101 mm. This adapter has four triangular pyramidal protrusions formed on the inner side of the inner flange at equal intervals (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 fabricated as an interposed between the vertical pipe and the main body of the joint pipe. It is a single-piece molded resin product, cylindrical as shown in Figure 10, with an outer diameter of 153 mm, an inner diameter of 130 mm, and an inner flange diameter of 101 mm. This adapter has four roof-shaped protrusions, each an isosceles triangle in side view, formed at equal intervals (90° intervals around the inner circumference) on the inner side of the inner flange. The size of each protrusion was 15 mm in height and 18 mm in width.

[0054] The adapters from Example 1 and Example 2 were individually inserted and fitted into the vertical main pipe, the vertical main pipe was positioned vertically with the adapter facing downwards, water was flowed through the vertical main pipe at a rate of 5 L / s, and the width of the gap formed in the water film that fell cylindrically from the lower end of the adapter directly below the adapter was measured. In both the configuration of Example 1 and Example 2, it was confirmed that four cuts approximately 50 mm wide were formed in the water film generated by the cylindrical water falling directly below the adapter.

[0055] Therefore, with the configurations of Examples 1 and 2, it is possible to reliably create breaks in the water film and generate fragmented sections of the water film. As a result, when applied to the drainage system shown in Figure 1, even if water flows into the main body of the joint pipe and forms a water film, it is possible to reliably drain the wastewater from the lateral branch pipe to the main body of the joint pipe. In contrast, as Comparative Example 1, an adapter of the same size as that of Example 1, but with only an inner flange and no protrusions, was used, and the same test as in Example 1 was performed. No breaks occurred in the water film formed directly beneath the adapter.

[0056] Next, the adapters from Examples 1 and 2 and Comparative Example 1 were incorporated into a drainage system with the configuration shown in Figure 1, and the positive pressure value near the horizontal pipe connection was measured when 5 L / s of water was flowed through it. The results are described 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 in the inner circumference of the adapter, the positive pressure value inside the piping can be lowered compared to using an adapter without protrusions.

[0058] Furthermore, the technical scope of the present invention described above is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. Furthermore, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of the present invention, and of course, the above embodiments may be combined as appropriate. Furthermore, although the embodiments described so far have described an example in which the present invention is applied to a drainage manifold joint 10, it goes without saying that the present invention can be widely applied to various pipe fittings, such as general fittings other than drainage manifold joints. [Explanation of Symbols]

[0059] 10...Drainage system, 20...Main vertical pipe (first vertical pipe), 21...Collection joint (pipe fitting), 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...Transverse branch pipe connection, 28...Transverse branch pipe, 38...Adapter, 40...Inner flange, 41, 50, 51, 52, 53, 54, 55, 56...Protrusion.

Claims

1. The joint pipe body has a vertical pipe connection at one end that can be connected to an upstream vertical pipe, and a horizontal branch pipe connection on its side that can be connected to a horizontal branch pipe, and a lower connecting pipe connected to the lower end of the joint pipe body, The main body of the joint pipe and the lower connecting pipe are made of resin. A heat-expandable sheet is wrapped around the outer surface of the lower connecting pipe. A pipe joint having one or more protrusions formed on the inner surface of the vertical pipe connection portion side upstream of the horizontal branch pipe connection portion in the main body of the pipe joint.

2. The joint pipe body has a vertical pipe connection at one end that can be connected to an upstream vertical pipe, and a horizontal branch pipe connection on its side that can be connected to a horizontal branch pipe, and a lower connecting pipe connected to the lower end of the joint pipe body, The main body of the joint pipe and the lower connecting pipe are made of resin. The lower connecting pipe is formed from a resin composition containing a polyvinyl chloride resin and a heat-expandable fire-resistant material. A pipe joint having one or more protrusions formed on the inner surface of the vertical pipe connection portion side upstream of the horizontal branch pipe connection portion in the main body of the pipe joint.

3. The aforementioned joint pipe body is provided with vertical ribs inside, The pipe joint according to claim 1 or 2, wherein the upper end of the longitudinal rib is lower than the lower end of the projection.

4. The pipe joint according to any one of claims 1 to 3, wherein the pipe joint body has a swirling vane on the bottom side.

5. The pipe fitting according to any one of claims 1 to 4, wherein the outer surface of the fitting pipe body is provided with a projection extending in the circumferential direction.

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

7. A drainage system comprising a pipe fitting 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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